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vendor: add missing test dependencies 

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
docker-18.09
Tonis Tiigi 2018-06-01 20:13:46 -07:00
parent 76d15da0d5
commit a4bc39542f
23 changed files with 3645 additions and 0 deletions
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4
vendor.conf
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@ -62,3 +62,7 @@ github.com/codahale/hdrhistogram f8ad88b59a584afeee9d334eff879b104439117b
github.com/opentracing-contrib/go-stdlib b1a47cfbdd7543e70e9ef3e73d0802ad306cc1cc github.com/opentracing-contrib/go-stdlib b1a47cfbdd7543e70e9ef3e73d0802ad306cc1cc
github.com/opencontainers/selinux 74a747aeaf2d66097b6908f572794f49f07dda2c github.com/opencontainers/selinux 74a747aeaf2d66097b6908f572794f49f07dda2c
# used by dockerfile tests
github.com/gotestyourself/gotestyourself cf3a5ab914a2efa8bc838d09f5918c1d44d029
github.com/google/go-cmp v0.2.0

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vendor/github.com/google/go-cmp/LICENSE generated vendored Normal file
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Copyright (c) 2017 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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vendor/github.com/google/go-cmp/README.md generated vendored Normal file
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# Package for equality of Go values
[![GoDoc](https://godoc.org/github.com/google/go-cmp/cmp?status.svg)][godoc]
[![Build Status](https://travis-ci.org/google/go-cmp.svg?branch=master)][travis]
This package is intended to be a more powerful and safer alternative to
`reflect.DeepEqual` for comparing whether two values are semantically equal.
The primary features of `cmp` are:
* When the default behavior of equality does not suit the needs of the test,
custom equality functions can override the equality operation.
For example, an equality function may report floats as equal so long as they
are within some tolerance of each other.
* Types that have an `Equal` method may use that method to determine equality.
This allows package authors to determine the equality operation for the types
that they define.
* If no custom equality functions are used and no `Equal` method is defined,
equality is determined by recursively comparing the primitive kinds on both
values, much like `reflect.DeepEqual`. Unlike `reflect.DeepEqual`, unexported
fields are not compared by default; they result in panics unless suppressed
by using an `Ignore` option (see `cmpopts.IgnoreUnexported`) or explicitly
compared using the `AllowUnexported` option.
See the [GoDoc documentation][godoc] for more information.
This is not an official Google product.
[godoc]: https://godoc.org/github.com/google/go-cmp/cmp
[travis]: https://travis-ci.org/google/go-cmp
## Install
```
go get -u github.com/google/go-cmp/cmp
```
## License
BSD - See [LICENSE][license] file
[license]: https://github.com/google/go-cmp/blob/master/LICENSE

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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// Package cmp determines equality of values.
//
// This package is intended to be a more powerful and safer alternative to
// reflect.DeepEqual for comparing whether two values are semantically equal.
//
// The primary features of cmp are:
//
// • When the default behavior of equality does not suit the needs of the test,
// custom equality functions can override the equality operation.
// For example, an equality function may report floats as equal so long as they
// are within some tolerance of each other.
//
// • Types that have an Equal method may use that method to determine equality.
// This allows package authors to determine the equality operation for the types
// that they define.
//
// • If no custom equality functions are used and no Equal method is defined,
// equality is determined by recursively comparing the primitive kinds on both
// values, much like reflect.DeepEqual. Unlike reflect.DeepEqual, unexported
// fields are not compared by default; they result in panics unless suppressed
// by using an Ignore option (see cmpopts.IgnoreUnexported) or explicitly compared
// using the AllowUnexported option.
package cmp
import (
"fmt"
"reflect"
"github.com/google/go-cmp/cmp/internal/diff"
"github.com/google/go-cmp/cmp/internal/function"
"github.com/google/go-cmp/cmp/internal/value"
)
// BUG(dsnet): Maps with keys containing NaN values cannot be properly compared due to
// the reflection package's inability to retrieve such entries. Equal will panic
// anytime it comes across a NaN key, but this behavior may change.
//
// See https://golang.org/issue/11104 for more details.
var nothing = reflect.Value{}
// Equal reports whether x and y are equal by recursively applying the
// following rules in the given order to x and y and all of their sub-values:
//
// • If two values are not of the same type, then they are never equal
// and the overall result is false.
//
// • Let S be the set of all Ignore, Transformer, and Comparer options that
// remain after applying all path filters, value filters, and type filters.
// If at least one Ignore exists in S, then the comparison is ignored.
// If the number of Transformer and Comparer options in S is greater than one,
// then Equal panics because it is ambiguous which option to use.
// If S contains a single Transformer, then use that to transform the current
// values and recursively call Equal on the output values.
// If S contains a single Comparer, then use that to compare the current values.
// Otherwise, evaluation proceeds to the next rule.
//
// • If the values have an Equal method of the form "(T) Equal(T) bool" or
// "(T) Equal(I) bool" where T is assignable to I, then use the result of
// x.Equal(y) even if x or y is nil.
// Otherwise, no such method exists and evaluation proceeds to the next rule.
//
// • Lastly, try to compare x and y based on their basic kinds.
// Simple kinds like booleans, integers, floats, complex numbers, strings, and
// channels are compared using the equivalent of the == operator in Go.
// Functions are only equal if they are both nil, otherwise they are unequal.
// Pointers are equal if the underlying values they point to are also equal.
// Interfaces are equal if their underlying concrete values are also equal.
//
// Structs are equal if all of their fields are equal. If a struct contains
// unexported fields, Equal panics unless the AllowUnexported option is used or
// an Ignore option (e.g., cmpopts.IgnoreUnexported) ignores that field.
//
// Arrays, slices, and maps are equal if they are both nil or both non-nil
// with the same length and the elements at each index or key are equal.
// Note that a non-nil empty slice and a nil slice are not equal.
// To equate empty slices and maps, consider using cmpopts.EquateEmpty.
// Map keys are equal according to the == operator.
// To use custom comparisons for map keys, consider using cmpopts.SortMaps.
func Equal(x, y interface{}, opts ...Option) bool {
s := newState(opts)
s.compareAny(reflect.ValueOf(x), reflect.ValueOf(y))
return s.result.Equal()
}
// Diff returns a human-readable report of the differences between two values.
// It returns an empty string if and only if Equal returns true for the same
// input values and options. The output string will use the "-" symbol to
// indicate elements removed from x, and the "+" symbol to indicate elements
// added to y.
//
// Do not depend on this output being stable.
func Diff(x, y interface{}, opts ...Option) string {
r := new(defaultReporter)
opts = Options{Options(opts), r}
eq := Equal(x, y, opts...)
d := r.String()
if (d == "") != eq {
panic("inconsistent difference and equality results")
}
return d
}
type state struct {
// These fields represent the "comparison state".
// Calling statelessCompare must not result in observable changes to these.
result diff.Result // The current result of comparison
curPath Path // The current path in the value tree
reporter reporter // Optional reporter used for difference formatting
// dynChecker triggers pseudo-random checks for option correctness.
// It is safe for statelessCompare to mutate this value.
dynChecker dynChecker
// These fields, once set by processOption, will not change.
exporters map[reflect.Type]bool // Set of structs with unexported field visibility
opts Options // List of all fundamental and filter options
}
func newState(opts []Option) *state {
s := new(state)
for _, opt := range opts {
s.processOption(opt)
}
return s
}
func (s *state) processOption(opt Option) {
switch opt := opt.(type) {
case nil:
case Options:
for _, o := range opt {
s.processOption(o)
}
case coreOption:
type filtered interface {
isFiltered() bool
}
if fopt, ok := opt.(filtered); ok && !fopt.isFiltered() {
panic(fmt.Sprintf("cannot use an unfiltered option: %v", opt))
}
s.opts = append(s.opts, opt)
case visibleStructs:
if s.exporters == nil {
s.exporters = make(map[reflect.Type]bool)
}
for t := range opt {
s.exporters[t] = true
}
case reporter:
if s.reporter != nil {
panic("difference reporter already registered")
}
s.reporter = opt
default:
panic(fmt.Sprintf("unknown option %T", opt))
}
}
// statelessCompare compares two values and returns the result.
// This function is stateless in that it does not alter the current result,
// or output to any registered reporters.
func (s *state) statelessCompare(vx, vy reflect.Value) diff.Result {
// We do not save and restore the curPath because all of the compareX
// methods should properly push and pop from the path.
// It is an implementation bug if the contents of curPath differs from
// when calling this function to when returning from it.
oldResult, oldReporter := s.result, s.reporter
s.result = diff.Result{} // Reset result
s.reporter = nil // Remove reporter to avoid spurious printouts
s.compareAny(vx, vy)
res := s.result
s.result, s.reporter = oldResult, oldReporter
return res
}
func (s *state) compareAny(vx, vy reflect.Value) {
// TODO: Support cyclic data structures.
// Rule 0: Differing types are never equal.
if !vx.IsValid() || !vy.IsValid() {
s.report(vx.IsValid() == vy.IsValid(), vx, vy)
return
}
if vx.Type() != vy.Type() {
s.report(false, vx, vy) // Possible for path to be empty
return
}
t := vx.Type()
if len(s.curPath) == 0 {
s.curPath.push(&pathStep{typ: t})
defer s.curPath.pop()
}
vx, vy = s.tryExporting(vx, vy)
// Rule 1: Check whether an option applies on this node in the value tree.
if s.tryOptions(vx, vy, t) {
return
}
// Rule 2: Check whether the type has a valid Equal method.
if s.tryMethod(vx, vy, t) {
return
}
// Rule 3: Recursively descend into each value's underlying kind.
switch t.Kind() {
case reflect.Bool:
s.report(vx.Bool() == vy.Bool(), vx, vy)
return
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
s.report(vx.Int() == vy.Int(), vx, vy)
return
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
s.report(vx.Uint() == vy.Uint(), vx, vy)
return
case reflect.Float32, reflect.Float64:
s.report(vx.Float() == vy.Float(), vx, vy)
return
case reflect.Complex64, reflect.Complex128:
s.report(vx.Complex() == vy.Complex(), vx, vy)
return
case reflect.String:
s.report(vx.String() == vy.String(), vx, vy)
return
case reflect.Chan, reflect.UnsafePointer:
s.report(vx.Pointer() == vy.Pointer(), vx, vy)
return
case reflect.Func:
s.report(vx.IsNil() && vy.IsNil(), vx, vy)
return
case reflect.Ptr:
if vx.IsNil() || vy.IsNil() {
s.report(vx.IsNil() && vy.IsNil(), vx, vy)
return
}
s.curPath.push(&indirect{pathStep{t.Elem()}})
defer s.curPath.pop()
s.compareAny(vx.Elem(), vy.Elem())
return
case reflect.Interface:
if vx.IsNil() || vy.IsNil() {
s.report(vx.IsNil() && vy.IsNil(), vx, vy)
return
}
if vx.Elem().Type() != vy.Elem().Type() {
s.report(false, vx.Elem(), vy.Elem())
return
}
s.curPath.push(&typeAssertion{pathStep{vx.Elem().Type()}})
defer s.curPath.pop()
s.compareAny(vx.Elem(), vy.Elem())
return
case reflect.Slice:
if vx.IsNil() || vy.IsNil() {
s.report(vx.IsNil() && vy.IsNil(), vx, vy)
return
}
fallthrough
case reflect.Array:
s.compareArray(vx, vy, t)
return
case reflect.Map:
s.compareMap(vx, vy, t)
return
case reflect.Struct:
s.compareStruct(vx, vy, t)
return
default:
panic(fmt.Sprintf("%v kind not handled", t.Kind()))
}
}
func (s *state) tryExporting(vx, vy reflect.Value) (reflect.Value, reflect.Value) {
if sf, ok := s.curPath[len(s.curPath)-1].(*structField); ok && sf.unexported {
if sf.force {
// Use unsafe pointer arithmetic to get read-write access to an
// unexported field in the struct.
vx = unsafeRetrieveField(sf.pvx, sf.field)
vy = unsafeRetrieveField(sf.pvy, sf.field)
} else {
// We are not allowed to export the value, so invalidate them
// so that tryOptions can panic later if not explicitly ignored.
vx = nothing
vy = nothing
}
}
return vx, vy
}
func (s *state) tryOptions(vx, vy reflect.Value, t reflect.Type) bool {
// If there were no FilterValues, we will not detect invalid inputs,
// so manually check for them and append invalid if necessary.
// We still evaluate the options since an ignore can override invalid.
opts := s.opts
if !vx.IsValid() || !vy.IsValid() {
opts = Options{opts, invalid{}}
}
// Evaluate all filters and apply the remaining options.
if opt := opts.filter(s, vx, vy, t); opt != nil {
opt.apply(s, vx, vy)
return true
}
return false
}
func (s *state) tryMethod(vx, vy reflect.Value, t reflect.Type) bool {
// Check if this type even has an Equal method.
m, ok := t.MethodByName("Equal")
if !ok || !function.IsType(m.Type, function.EqualAssignable) {
return false
}
eq := s.callTTBFunc(m.Func, vx, vy)
s.report(eq, vx, vy)
return true
}
func (s *state) callTRFunc(f, v reflect.Value) reflect.Value {
v = sanitizeValue(v, f.Type().In(0))
if !s.dynChecker.Next() {
return f.Call([]reflect.Value{v})[0]
}
// Run the function twice and ensure that we get the same results back.
// We run in goroutines so that the race detector (if enabled) can detect
// unsafe mutations to the input.
c := make(chan reflect.Value)
go detectRaces(c, f, v)
want := f.Call([]reflect.Value{v})[0]
if got := <-c; !s.statelessCompare(got, want).Equal() {
// To avoid false-positives with non-reflexive equality operations,
// we sanity check whether a value is equal to itself.
if !s.statelessCompare(want, want).Equal() {
return want
}
fn := getFuncName(f.Pointer())
panic(fmt.Sprintf("non-deterministic function detected: %s", fn))
}
return want
}
func (s *state) callTTBFunc(f, x, y reflect.Value) bool {
x = sanitizeValue(x, f.Type().In(0))
y = sanitizeValue(y, f.Type().In(1))
if !s.dynChecker.Next() {
return f.Call([]reflect.Value{x, y})[0].Bool()
}
// Swapping the input arguments is sufficient to check that
// f is symmetric and deterministic.
// We run in goroutines so that the race detector (if enabled) can detect
// unsafe mutations to the input.
c := make(chan reflect.Value)
go detectRaces(c, f, y, x)
want := f.Call([]reflect.Value{x, y})[0].Bool()
if got := <-c; !got.IsValid() || got.Bool() != want {
fn := getFuncName(f.Pointer())
panic(fmt.Sprintf("non-deterministic or non-symmetric function detected: %s", fn))
}
return want
}
func detectRaces(c chan<- reflect.Value, f reflect.Value, vs ...reflect.Value) {
var ret reflect.Value
defer func() {
recover() // Ignore panics, let the other call to f panic instead
c <- ret
}()
ret = f.Call(vs)[0]
}
// sanitizeValue converts nil interfaces of type T to those of type R,
// assuming that T is assignable to R.
// Otherwise, it returns the input value as is.
func sanitizeValue(v reflect.Value, t reflect.Type) reflect.Value {
// TODO(dsnet): Remove this hacky workaround.
// See https://golang.org/issue/22143
if v.Kind() == reflect.Interface && v.IsNil() && v.Type() != t {
return reflect.New(t).Elem()
}
return v
}
func (s *state) compareArray(vx, vy reflect.Value, t reflect.Type) {
step := &sliceIndex{pathStep{t.Elem()}, 0, 0}
s.curPath.push(step)
// Compute an edit-script for slices vx and vy.
es := diff.Difference(vx.Len(), vy.Len(), func(ix, iy int) diff.Result {
step.xkey, step.ykey = ix, iy
return s.statelessCompare(vx.Index(ix), vy.Index(iy))
})
// Report the entire slice as is if the arrays are of primitive kind,
// and the arrays are different enough.
isPrimitive := false
switch t.Elem().Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr,
reflect.Bool, reflect.Float32, reflect.Float64, reflect.Complex64, reflect.Complex128:
isPrimitive = true
}
if isPrimitive && es.Dist() > (vx.Len()+vy.Len())/4 {
s.curPath.pop() // Pop first since we are reporting the whole slice
s.report(false, vx, vy)
return
}
// Replay the edit-script.
var ix, iy int
for _, e := range es {
switch e {
case diff.UniqueX:
step.xkey, step.ykey = ix, -1
s.report(false, vx.Index(ix), nothing)
ix++
case diff.UniqueY:
step.xkey, step.ykey = -1, iy
s.report(false, nothing, vy.Index(iy))
iy++
default:
step.xkey, step.ykey = ix, iy
if e == diff.Identity {
s.report(true, vx.Index(ix), vy.Index(iy))
} else {
s.compareAny(vx.Index(ix), vy.Index(iy))
}
ix++
iy++
}
}
s.curPath.pop()
return
}
func (s *state) compareMap(vx, vy reflect.Value, t reflect.Type) {
if vx.IsNil() || vy.IsNil() {
s.report(vx.IsNil() && vy.IsNil(), vx, vy)
return
}
// We combine and sort the two map keys so that we can perform the
// comparisons in a deterministic order.
step := &mapIndex{pathStep: pathStep{t.Elem()}}
s.curPath.push(step)
defer s.curPath.pop()
for _, k := range value.SortKeys(append(vx.MapKeys(), vy.MapKeys()...)) {
step.key = k
vvx := vx.MapIndex(k)
vvy := vy.MapIndex(k)
switch {
case vvx.IsValid() && vvy.IsValid():
s.compareAny(vvx, vvy)
case vvx.IsValid() && !vvy.IsValid():
s.report(false, vvx, nothing)
case !vvx.IsValid() && vvy.IsValid():
s.report(false, nothing, vvy)
default:
// It is possible for both vvx and vvy to be invalid if the
// key contained a NaN value in it. There is no way in
// reflection to be able to retrieve these values.
// See https://golang.org/issue/11104
panic(fmt.Sprintf("%#v has map key with NaNs", s.curPath))
}
}
}
func (s *state) compareStruct(vx, vy reflect.Value, t reflect.Type) {
var vax, vay reflect.Value // Addressable versions of vx and vy
step := &structField{}
s.curPath.push(step)
defer s.curPath.pop()
for i := 0; i < t.NumField(); i++ {
vvx := vx.Field(i)
vvy := vy.Field(i)
step.typ = t.Field(i).Type
step.name = t.Field(i).Name
step.idx = i
step.unexported = !isExported(step.name)
if step.unexported {
// Defer checking of unexported fields until later to give an
// Ignore a chance to ignore the field.
if !vax.IsValid() || !vay.IsValid() {
// For unsafeRetrieveField to work, the parent struct must
// be addressable. Create a new copy of the values if
// necessary to make them addressable.
vax = makeAddressable(vx)
vay = makeAddressable(vy)
}
step.force = s.exporters[t]
step.pvx = vax
step.pvy = vay
step.field = t.Field(i)
}
s.compareAny(vvx, vvy)
}
}
// report records the result of a single comparison.
// It also calls Report if any reporter is registered.
func (s *state) report(eq bool, vx, vy reflect.Value) {
if eq {
s.result.NSame++
} else {
s.result.NDiff++
}
if s.reporter != nil {
s.reporter.Report(vx, vy, eq, s.curPath)
}
}
// dynChecker tracks the state needed to periodically perform checks that
// user provided functions are symmetric and deterministic.
// The zero value is safe for immediate use.
type dynChecker struct{ curr, next int }
// Next increments the state and reports whether a check should be performed.
//
// Checks occur every Nth function call, where N is a triangular number:
// 0 1 3 6 10 15 21 28 36 45 55 66 78 91 105 120 136 153 171 190 ...
// See https://en.wikipedia.org/wiki/Triangular_number
//
// This sequence ensures that the cost of checks drops significantly as
// the number of functions calls grows larger.
func (dc *dynChecker) Next() bool {
ok := dc.curr == dc.next
if ok {
dc.curr = 0
dc.next++
}
dc.curr++
return ok
}
// makeAddressable returns a value that is always addressable.
// It returns the input verbatim if it is already addressable,
// otherwise it creates a new value and returns an addressable copy.
func makeAddressable(v reflect.Value) reflect.Value {
if v.CanAddr() {
return v
}
vc := reflect.New(v.Type()).Elem()
vc.Set(v)
return vc
}

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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// +build !debug
package diff
var debug debugger
type debugger struct{}
func (debugger) Begin(_, _ int, f EqualFunc, _, _ *EditScript) EqualFunc {
return f
}
func (debugger) Update() {}
func (debugger) Finish() {}

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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// +build debug
package diff
import (
"fmt"
"strings"
"sync"
"time"
)
// The algorithm can be seen running in real-time by enabling debugging:
// go test -tags=debug -v
//
// Example output:
// === RUN TestDifference/#34
// ┌───────────────────────────────┐
// │ \ · · · · · · · · · · · · · · │
// │ · # · · · · · · · · · · · · · │
// │ · \ · · · · · · · · · · · · · │
// │ · · \ · · · · · · · · · · · · │
// │ · · · X # · · · · · · · · · · │
// │ · · · # \ · · · · · · · · · · │
// │ · · · · · # # · · · · · · · · │
// │ · · · · · # \ · · · · · · · · │
// │ · · · · · · · \ · · · · · · · │
// │ · · · · · · · · \ · · · · · · │
// │ · · · · · · · · · \ · · · · · │
// │ · · · · · · · · · · \ · · # · │
// │ · · · · · · · · · · · \ # # · │
// │ · · · · · · · · · · · # # # · │
// │ · · · · · · · · · · # # # # · │
// │ · · · · · · · · · # # # # # · │
// │ · · · · · · · · · · · · · · \ │
// └───────────────────────────────┘
// [.Y..M.XY......YXYXY.|]
//
// The grid represents the edit-graph where the horizontal axis represents
// list X and the vertical axis represents list Y. The start of the two lists
// is the top-left, while the ends are the bottom-right. The '·' represents
// an unexplored node in the graph. The '\' indicates that the two symbols
// from list X and Y are equal. The 'X' indicates that two symbols are similar
// (but not exactly equal) to each other. The '#' indicates that the two symbols
// are different (and not similar). The algorithm traverses this graph trying to
// make the paths starting in the top-left and the bottom-right connect.
//
// The series of '.', 'X', 'Y', and 'M' characters at the bottom represents
// the currently established path from the forward and reverse searches,
// separated by a '|' character.
const (
updateDelay = 100 * time.Millisecond
finishDelay = 500 * time.Millisecond
ansiTerminal = true // ANSI escape codes used to move terminal cursor
)
var debug debugger
type debugger struct {
sync.Mutex
p1, p2 EditScript
fwdPath, revPath *EditScript
grid []byte
lines int
}
func (dbg *debugger) Begin(nx, ny int, f EqualFunc, p1, p2 *EditScript) EqualFunc {
dbg.Lock()
dbg.fwdPath, dbg.revPath = p1, p2
top := "┌─" + strings.Repeat("──", nx) + "┐\n"
row := "│ " + strings.Repeat("· ", nx) + "│\n"
btm := "└─" + strings.Repeat("──", nx) + "┘\n"
dbg.grid = []byte(top + strings.Repeat(row, ny) + btm)
dbg.lines = strings.Count(dbg.String(), "\n")
fmt.Print(dbg)
// Wrap the EqualFunc so that we can intercept each result.
return func(ix, iy int) (r Result) {
cell := dbg.grid[len(top)+iy*len(row):][len("│ ")+len("· ")*ix:][:len("·")]
for i := range cell {
cell[i] = 0 // Zero out the multiple bytes of UTF-8 middle-dot
}
switch r = f(ix, iy); {
case r.Equal():
cell[0] = '\\'
case r.Similar():
cell[0] = 'X'
default:
cell[0] = '#'
}
return
}
}
func (dbg *debugger) Update() {
dbg.print(updateDelay)
}
func (dbg *debugger) Finish() {
dbg.print(finishDelay)
dbg.Unlock()
}
func (dbg *debugger) String() string {
dbg.p1, dbg.p2 = *dbg.fwdPath, dbg.p2[:0]
for i := len(*dbg.revPath) - 1; i >= 0; i-- {
dbg.p2 = append(dbg.p2, (*dbg.revPath)[i])
}
return fmt.Sprintf("%s[%v|%v]\n\n", dbg.grid, dbg.p1, dbg.p2)
}
func (dbg *debugger) print(d time.Duration) {
if ansiTerminal {
fmt.Printf("\x1b[%dA", dbg.lines) // Reset terminal cursor
}
fmt.Print(dbg)
time.Sleep(d)
}

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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// Package diff implements an algorithm for producing edit-scripts.
// The edit-script is a sequence of operations needed to transform one list
// of symbols into another (or vice-versa). The edits allowed are insertions,
// deletions, and modifications. The summation of all edits is called the
// Levenshtein distance as this problem is well-known in computer science.
//
// This package prioritizes performance over accuracy. That is, the run time
// is more important than obtaining a minimal Levenshtein distance.
package diff
// EditType represents a single operation within an edit-script.
type EditType uint8
const (
// Identity indicates that a symbol pair is identical in both list X and Y.
Identity EditType = iota
// UniqueX indicates that a symbol only exists in X and not Y.
UniqueX
// UniqueY indicates that a symbol only exists in Y and not X.
UniqueY
// Modified indicates that a symbol pair is a modification of each other.
Modified
)
// EditScript represents the series of differences between two lists.
type EditScript []EditType
// String returns a human-readable string representing the edit-script where
// Identity, UniqueX, UniqueY, and Modified are represented by the
// '.', 'X', 'Y', and 'M' characters, respectively.
func (es EditScript) String() string {
b := make([]byte, len(es))
for i, e := range es {
switch e {
case Identity:
b[i] = '.'
case UniqueX:
b[i] = 'X'
case UniqueY:
b[i] = 'Y'
case Modified:
b[i] = 'M'
default:
panic("invalid edit-type")
}
}
return string(b)
}
// stats returns a histogram of the number of each type of edit operation.
func (es EditScript) stats() (s struct{ NI, NX, NY, NM int }) {
for _, e := range es {
switch e {
case Identity:
s.NI++
case UniqueX:
s.NX++
case UniqueY:
s.NY++
case Modified:
s.NM++
default:
panic("invalid edit-type")
}
}
return
}
// Dist is the Levenshtein distance and is guaranteed to be 0 if and only if
// lists X and Y are equal.
func (es EditScript) Dist() int { return len(es) - es.stats().NI }
// LenX is the length of the X list.
func (es EditScript) LenX() int { return len(es) - es.stats().NY }
// LenY is the length of the Y list.
func (es EditScript) LenY() int { return len(es) - es.stats().NX }
// EqualFunc reports whether the symbols at indexes ix and iy are equal.
// When called by Difference, the index is guaranteed to be within nx and ny.
type EqualFunc func(ix int, iy int) Result
// Result is the result of comparison.
// NSame is the number of sub-elements that are equal.
// NDiff is the number of sub-elements that are not equal.
type Result struct{ NSame, NDiff int }
// Equal indicates whether the symbols are equal. Two symbols are equal
// if and only if NDiff == 0. If Equal, then they are also Similar.
func (r Result) Equal() bool { return r.NDiff == 0 }
// Similar indicates whether two symbols are similar and may be represented
// by using the Modified type. As a special case, we consider binary comparisons
// (i.e., those that return Result{1, 0} or Result{0, 1}) to be similar.
//
// The exact ratio of NSame to NDiff to determine similarity may change.
func (r Result) Similar() bool {
// Use NSame+1 to offset NSame so that binary comparisons are similar.
return r.NSame+1 >= r.NDiff
}
// Difference reports whether two lists of lengths nx and ny are equal
// given the definition of equality provided as f.
//
// This function returns an edit-script, which is a sequence of operations
// needed to convert one list into the other. The following invariants for
// the edit-script are maintained:
// • eq == (es.Dist()==0)
// • nx == es.LenX()
// • ny == es.LenY()
//
// This algorithm is not guaranteed to be an optimal solution (i.e., one that
// produces an edit-script with a minimal Levenshtein distance). This algorithm
// favors performance over optimality. The exact output is not guaranteed to
// be stable and may change over time.
func Difference(nx, ny int, f EqualFunc) (es EditScript) {
// This algorithm is based on traversing what is known as an "edit-graph".
// See Figure 1 from "An O(ND) Difference Algorithm and Its Variations"
// by Eugene W. Myers. Since D can be as large as N itself, this is
// effectively O(N^2). Unlike the algorithm from that paper, we are not
// interested in the optimal path, but at least some "decent" path.
//
// For example, let X and Y be lists of symbols:
// X = [A B C A B B A]
// Y = [C B A B A C]
//
// The edit-graph can be drawn as the following:
// A B C A B B A
// ┌─────────────┐
// C │_|_|\|_|_|_|_│ 0
// B │_|\|_|_|\|\|_│ 1
// A │\|_|_|\|_|_|\│ 2
// B │_|\|_|_|\|\|_│ 3
// A │\|_|_|\|_|_|\│ 4
// C │ | |\| | | | │ 5
// └─────────────┘ 6
// 0 1 2 3 4 5 6 7
//
// List X is written along the horizontal axis, while list Y is written
// along the vertical axis. At any point on this grid, if the symbol in
// list X matches the corresponding symbol in list Y, then a '\' is drawn.
// The goal of any minimal edit-script algorithm is to find a path from the
// top-left corner to the bottom-right corner, while traveling through the
// fewest horizontal or vertical edges.
// A horizontal edge is equivalent to inserting a symbol from list X.
// A vertical edge is equivalent to inserting a symbol from list Y.
// A diagonal edge is equivalent to a matching symbol between both X and Y.
// Invariants:
// • 0 ≤ fwdPath.X ≤ (fwdFrontier.X, revFrontier.X) ≤ revPath.X ≤ nx
// • 0 ≤ fwdPath.Y ≤ (fwdFrontier.Y, revFrontier.Y) ≤ revPath.Y ≤ ny
//
// In general:
// • fwdFrontier.X < revFrontier.X
// • fwdFrontier.Y < revFrontier.Y
// Unless, it is time for the algorithm to terminate.
fwdPath := path{+1, point{0, 0}, make(EditScript, 0, (nx+ny)/2)}
revPath := path{-1, point{nx, ny}, make(EditScript, 0)}
fwdFrontier := fwdPath.point // Forward search frontier
revFrontier := revPath.point // Reverse search frontier
// Search budget bounds the cost of searching for better paths.
// The longest sequence of non-matching symbols that can be tolerated is
// approximately the square-root of the search budget.
searchBudget := 4 * (nx + ny) // O(n)
// The algorithm below is a greedy, meet-in-the-middle algorithm for
// computing sub-optimal edit-scripts between two lists.
//
// The algorithm is approximately as follows:
// • Searching for differences switches back-and-forth between
// a search that starts at the beginning (the top-left corner), and
// a search that starts at the end (the bottom-right corner). The goal of
// the search is connect with the search from the opposite corner.
// • As we search, we build a path in a greedy manner, where the first
// match seen is added to the path (this is sub-optimal, but provides a
// decent result in practice). When matches are found, we try the next pair
// of symbols in the lists and follow all matches as far as possible.
// • When searching for matches, we search along a diagonal going through
// through the "frontier" point. If no matches are found, we advance the
// frontier towards the opposite corner.
// • This algorithm terminates when either the X coordinates or the
// Y coordinates of the forward and reverse frontier points ever intersect.
//
// This algorithm is correct even if searching only in the forward direction
// or in the reverse direction. We do both because it is commonly observed
// that two lists commonly differ because elements were added to the front
// or end of the other list.
//
// Running the tests with the "debug" build tag prints a visualization of
// the algorithm running in real-time. This is educational for understanding
// how the algorithm works. See debug_enable.go.
f = debug.Begin(nx, ny, f, &fwdPath.es, &revPath.es)
for {
// Forward search from the beginning.
if fwdFrontier.X >= revFrontier.X || fwdFrontier.Y >= revFrontier.Y || searchBudget == 0 {
break
}
for stop1, stop2, i := false, false, 0; !(stop1 && stop2) && searchBudget > 0; i++ {
// Search in a diagonal pattern for a match.
z := zigzag(i)
p := point{fwdFrontier.X + z, fwdFrontier.Y - z}
switch {
case p.X >= revPath.X || p.Y < fwdPath.Y:
stop1 = true // Hit top-right corner
case p.Y >= revPath.Y || p.X < fwdPath.X:
stop2 = true // Hit bottom-left corner
case f(p.X, p.Y).Equal():
// Match found, so connect the path to this point.
fwdPath.connect(p, f)
fwdPath.append(Identity)
// Follow sequence of matches as far as possible.
for fwdPath.X < revPath.X && fwdPath.Y < revPath.Y {
if !f(fwdPath.X, fwdPath.Y).Equal() {
break
}
fwdPath.append(Identity)
}
fwdFrontier = fwdPath.point
stop1, stop2 = true, true
default:
searchBudget-- // Match not found
}
debug.Update()
}
// Advance the frontier towards reverse point.
if revPath.X-fwdFrontier.X >= revPath.Y-fwdFrontier.Y {
fwdFrontier.X++
} else {
fwdFrontier.Y++
}
// Reverse search from the end.
if fwdFrontier.X >= revFrontier.X || fwdFrontier.Y >= revFrontier.Y || searchBudget == 0 {
break
}
for stop1, stop2, i := false, false, 0; !(stop1 && stop2) && searchBudget > 0; i++ {
// Search in a diagonal pattern for a match.
z := zigzag(i)
p := point{revFrontier.X - z, revFrontier.Y + z}
switch {
case fwdPath.X >= p.X || revPath.Y < p.Y:
stop1 = true // Hit bottom-left corner
case fwdPath.Y >= p.Y || revPath.X < p.X:
stop2 = true // Hit top-right corner
case f(p.X-1, p.Y-1).Equal():
// Match found, so connect the path to this point.
revPath.connect(p, f)
revPath.append(Identity)
// Follow sequence of matches as far as possible.
for fwdPath.X < revPath.X && fwdPath.Y < revPath.Y {
if !f(revPath.X-1, revPath.Y-1).Equal() {
break
}
revPath.append(Identity)
}
revFrontier = revPath.point
stop1, stop2 = true, true
default:
searchBudget-- // Match not found
}
debug.Update()
}
// Advance the frontier towards forward point.
if revFrontier.X-fwdPath.X >= revFrontier.Y-fwdPath.Y {
revFrontier.X--
} else {
revFrontier.Y--
}
}
// Join the forward and reverse paths and then append the reverse path.
fwdPath.connect(revPath.point, f)
for i := len(revPath.es) - 1; i >= 0; i-- {
t := revPath.es[i]
revPath.es = revPath.es[:i]
fwdPath.append(t)
}
debug.Finish()
return fwdPath.es
}
type path struct {
dir int // +1 if forward, -1 if reverse
point // Leading point of the EditScript path
es EditScript
}
// connect appends any necessary Identity, Modified, UniqueX, or UniqueY types
// to the edit-script to connect p.point to dst.
func (p *path) connect(dst point, f EqualFunc) {
if p.dir > 0 {
// Connect in forward direction.
for dst.X > p.X && dst.Y > p.Y {
switch r := f(p.X, p.Y); {
case r.Equal():
p.append(Identity)
case r.Similar():
p.append(Modified)
case dst.X-p.X >= dst.Y-p.Y:
p.append(UniqueX)
default:
p.append(UniqueY)
}
}
for dst.X > p.X {
p.append(UniqueX)
}
for dst.Y > p.Y {
p.append(UniqueY)
}
} else {
// Connect in reverse direction.
for p.X > dst.X && p.Y > dst.Y {
switch r := f(p.X-1, p.Y-1); {
case r.Equal():
p.append(Identity)
case r.Similar():
p.append(Modified)
case p.Y-dst.Y >= p.X-dst.X:
p.append(UniqueY)
default:
p.append(UniqueX)
}
}
for p.X > dst.X {
p.append(UniqueX)
}
for p.Y > dst.Y {
p.append(UniqueY)
}
}
}
func (p *path) append(t EditType) {
p.es = append(p.es, t)
switch t {
case Identity, Modified:
p.add(p.dir, p.dir)
case UniqueX:
p.add(p.dir, 0)
case UniqueY:
p.add(0, p.dir)
}
debug.Update()
}
type point struct{ X, Y int }
func (p *point) add(dx, dy int) { p.X += dx; p.Y += dy }
// zigzag maps a consecutive sequence of integers to a zig-zag sequence.
// [0 1 2 3 4 5 ...] => [0 -1 +1 -2 +2 ...]
func zigzag(x int) int {
if x&1 != 0 {
x = ^x
}
return x >> 1
}

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vendor/github.com/google/go-cmp/cmp/internal/function/func.go generated vendored Normal file
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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// Package function identifies function types.
package function
import "reflect"
type funcType int
const (
_ funcType = iota
ttbFunc // func(T, T) bool
tibFunc // func(T, I) bool
trFunc // func(T) R
Equal = ttbFunc // func(T, T) bool
EqualAssignable = tibFunc // func(T, I) bool; encapsulates func(T, T) bool
Transformer = trFunc // func(T) R
ValueFilter = ttbFunc // func(T, T) bool
Less = ttbFunc // func(T, T) bool
)
var boolType = reflect.TypeOf(true)
// IsType reports whether the reflect.Type is of the specified function type.
func IsType(t reflect.Type, ft funcType) bool {
if t == nil || t.Kind() != reflect.Func || t.IsVariadic() {
return false
}
ni, no := t.NumIn(), t.NumOut()
switch ft {
case ttbFunc: // func(T, T) bool
if ni == 2 && no == 1 && t.In(0) == t.In(1) && t.Out(0) == boolType {
return true
}
case tibFunc: // func(T, I) bool
if ni == 2 && no == 1 && t.In(0).AssignableTo(t.In(1)) && t.Out(0) == boolType {
return true
}
case trFunc: // func(T) R
if ni == 1 && no == 1 {
return true
}
}
return false
}

277
vendor/github.com/google/go-cmp/cmp/internal/value/format.go generated vendored Normal file
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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// Package value provides functionality for reflect.Value types.
package value
import (
"fmt"
"reflect"
"strconv"
"strings"
"unicode"
)
var stringerIface = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
// Format formats the value v as a string.
//
// This is similar to fmt.Sprintf("%+v", v) except this:
// * Prints the type unless it can be elided
// * Avoids printing struct fields that are zero
// * Prints a nil-slice as being nil, not empty
// * Prints map entries in deterministic order
func Format(v reflect.Value, conf FormatConfig) string {
conf.printType = true
conf.followPointers = true
conf.realPointers = true
return formatAny(v, conf, nil)
}
type FormatConfig struct {
UseStringer bool // Should the String method be used if available?
printType bool // Should we print the type before the value?
PrintPrimitiveType bool // Should we print the type of primitives?
followPointers bool // Should we recursively follow pointers?
realPointers bool // Should we print the real address of pointers?
}
func formatAny(v reflect.Value, conf FormatConfig, visited map[uintptr]bool) string {
// TODO: Should this be a multi-line printout in certain situations?
if !v.IsValid() {
return "<non-existent>"
}
if conf.UseStringer && v.Type().Implements(stringerIface) && v.CanInterface() {
if (v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface) && v.IsNil() {
return "<nil>"
}
const stringerPrefix = "s" // Indicates that the String method was used
s := v.Interface().(fmt.Stringer).String()
return stringerPrefix + formatString(s)
}
switch v.Kind() {
case reflect.Bool:
return formatPrimitive(v.Type(), v.Bool(), conf)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return formatPrimitive(v.Type(), v.Int(), conf)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
if v.Type().PkgPath() == "" || v.Kind() == reflect.Uintptr {
// Unnamed uints are usually bytes or words, so use hexadecimal.
return formatPrimitive(v.Type(), formatHex(v.Uint()), conf)
}
return formatPrimitive(v.Type(), v.Uint(), conf)
case reflect.Float32, reflect.Float64:
return formatPrimitive(v.Type(), v.Float(), conf)
case reflect.Complex64, reflect.Complex128:
return formatPrimitive(v.Type(), v.Complex(), conf)
case reflect.String:
return formatPrimitive(v.Type(), formatString(v.String()), conf)
case reflect.UnsafePointer, reflect.Chan, reflect.Func:
return formatPointer(v, conf)
case reflect.Ptr:
if v.IsNil() {
if conf.printType {
return fmt.Sprintf("(%v)(nil)", v.Type())
}
return "<nil>"
}
if visited[v.Pointer()] || !conf.followPointers {
return formatPointer(v, conf)
}
visited = insertPointer(visited, v.Pointer())
return "&" + formatAny(v.Elem(), conf, visited)
case reflect.Interface:
if v.IsNil() {
if conf.printType {
return fmt.Sprintf("%v(nil)", v.Type())
}
return "<nil>"
}
return formatAny(v.Elem(), conf, visited)
case reflect.Slice:
if v.IsNil() {
if conf.printType {
return fmt.Sprintf("%v(nil)", v.Type())
}
return "<nil>"
}
if visited[v.Pointer()] {
return formatPointer(v, conf)
}
visited = insertPointer(visited, v.Pointer())
fallthrough
case reflect.Array:
var ss []string
subConf := conf
subConf.printType = v.Type().Elem().Kind() == reflect.Interface
for i := 0; i < v.Len(); i++ {
s := formatAny(v.Index(i), subConf, visited)
ss = append(ss, s)
}
s := fmt.Sprintf("{%s}", strings.Join(ss, ", "))
if conf.printType {
return v.Type().String() + s
}
return s
case reflect.Map:
if v.IsNil() {
if conf.printType {
return fmt.Sprintf("%v(nil)", v.Type())
}
return "<nil>"
}
if visited[v.Pointer()] {
return formatPointer(v, conf)
}
visited = insertPointer(visited, v.Pointer())
var ss []string
keyConf, valConf := conf, conf
keyConf.printType = v.Type().Key().Kind() == reflect.Interface
keyConf.followPointers = false
valConf.printType = v.Type().Elem().Kind() == reflect.Interface
for _, k := range SortKeys(v.MapKeys()) {
sk := formatAny(k, keyConf, visited)
sv := formatAny(v.MapIndex(k), valConf, visited)
ss = append(ss, fmt.Sprintf("%s: %s", sk, sv))
}
s := fmt.Sprintf("{%s}", strings.Join(ss, ", "))
if conf.printType {
return v.Type().String() + s
}
return s
case reflect.Struct:
var ss []string
subConf := conf
subConf.printType = true
for i := 0; i < v.NumField(); i++ {
vv := v.Field(i)
if isZero(vv) {
continue // Elide zero value fields
}
name := v.Type().Field(i).Name
subConf.UseStringer = conf.UseStringer
s := formatAny(vv, subConf, visited)
ss = append(ss, fmt.Sprintf("%s: %s", name, s))
}
s := fmt.Sprintf("{%s}", strings.Join(ss, ", "))
if conf.printType {
return v.Type().String() + s
}
return s
default:
panic(fmt.Sprintf("%v kind not handled", v.Kind()))
}
}
func formatString(s string) string {
// Use quoted string if it the same length as a raw string literal.
// Otherwise, attempt to use the raw string form.
qs := strconv.Quote(s)
if len(qs) == 1+len(s)+1 {
return qs
}
// Disallow newlines to ensure output is a single line.
// Only allow printable runes for readability purposes.
rawInvalid := func(r rune) bool {
return r == '`' || r == '\n' || !unicode.IsPrint(r)
}
if strings.IndexFunc(s, rawInvalid) < 0 {
return "`" + s + "`"
}
return qs
}
func formatPrimitive(t reflect.Type, v interface{}, conf FormatConfig) string {
if conf.printType && (conf.PrintPrimitiveType || t.PkgPath() != "") {
return fmt.Sprintf("%v(%v)", t, v)
}
return fmt.Sprintf("%v", v)
}
func formatPointer(v reflect.Value, conf FormatConfig) string {
p := v.Pointer()
if !conf.realPointers {
p = 0 // For deterministic printing purposes
}
s := formatHex(uint64(p))
if conf.printType {
return fmt.Sprintf("(%v)(%s)", v.Type(), s)
}
return s
}
func formatHex(u uint64) string {
var f string
switch {
case u <= 0xff:
f = "0x%02x"
case u <= 0xffff:
f = "0x%04x"
case u <= 0xffffff:
f = "0x%06x"
case u <= 0xffffffff:
f = "0x%08x"
case u <= 0xffffffffff:
f = "0x%010x"
case u <= 0xffffffffffff:
f = "0x%012x"
case u <= 0xffffffffffffff:
f = "0x%014x"
case u <= 0xffffffffffffffff:
f = "0x%016x"
}
return fmt.Sprintf(f, u)
}
// insertPointer insert p into m, allocating m if necessary.
func insertPointer(m map[uintptr]bool, p uintptr) map[uintptr]bool {
if m == nil {
m = make(map[uintptr]bool)
}
m[p] = true
return m
}
// isZero reports whether v is the zero value.
// This does not rely on Interface and so can be used on unexported fields.
func isZero(v reflect.Value) bool {
switch v.Kind() {
case reflect.Bool:
return v.Bool() == false
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return v.Uint() == 0
case reflect.Float32, reflect.Float64:
return v.Float() == 0
case reflect.Complex64, reflect.Complex128:
return v.Complex() == 0
case reflect.String:
return v.String() == ""
case reflect.UnsafePointer:
return v.Pointer() == 0
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Ptr, reflect.Map, reflect.Slice:
return v.IsNil()
case reflect.Array:
for i := 0; i < v.Len(); i++ {
if !isZero(v.Index(i)) {
return false
}
}
return true
case reflect.Struct:
for i := 0; i < v.NumField(); i++ {
if !isZero(v.Field(i)) {
return false
}
}
return true
}
return false
}

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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
package value
import (
"fmt"
"math"
"reflect"
"sort"
)
// SortKeys sorts a list of map keys, deduplicating keys if necessary.
// The type of each value must be comparable.
func SortKeys(vs []reflect.Value) []reflect.Value {
if len(vs) == 0 {
return vs
}
// Sort the map keys.
sort.Sort(valueSorter(vs))
// Deduplicate keys (fails for NaNs).
vs2 := vs[:1]
for _, v := range vs[1:] {
if isLess(vs2[len(vs2)-1], v) {
vs2 = append(vs2, v)
}
}
return vs2
}
// TODO: Use sort.Slice once Google AppEngine is on Go1.8 or above.
type valueSorter []reflect.Value
func (vs valueSorter) Len() int { return len(vs) }
func (vs valueSorter) Less(i, j int) bool { return isLess(vs[i], vs[j]) }
func (vs valueSorter) Swap(i, j int) { vs[i], vs[j] = vs[j], vs[i] }
// isLess is a generic function for sorting arbitrary map keys.
// The inputs must be of the same type and must be comparable.
func isLess(x, y reflect.Value) bool {
switch x.Type().Kind() {
case reflect.Bool:
return !x.Bool() && y.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return x.Int() < y.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return x.Uint() < y.Uint()
case reflect.Float32, reflect.Float64:
fx, fy := x.Float(), y.Float()
return fx < fy || math.IsNaN(fx) && !math.IsNaN(fy)
case reflect.Complex64, reflect.Complex128:
cx, cy := x.Complex(), y.Complex()
rx, ix, ry, iy := real(cx), imag(cx), real(cy), imag(cy)
if rx == ry || (math.IsNaN(rx) && math.IsNaN(ry)) {
return ix < iy || math.IsNaN(ix) && !math.IsNaN(iy)
}
return rx < ry || math.IsNaN(rx) && !math.IsNaN(ry)
case reflect.Ptr, reflect.UnsafePointer, reflect.Chan:
return x.Pointer() < y.Pointer()
case reflect.String:
return x.String() < y.String()
case reflect.Array:
for i := 0; i < x.Len(); i++ {
if isLess(x.Index(i), y.Index(i)) {
return true
}
if isLess(y.Index(i), x.Index(i)) {
return false
}
}
return false
case reflect.Struct:
for i := 0; i < x.NumField(); i++ {
if isLess(x.Field(i), y.Field(i)) {
return true
}
if isLess(y.Field(i), x.Field(i)) {
return false
}
}
return false
case reflect.Interface:
vx, vy := x.Elem(), y.Elem()
if !vx.IsValid() || !vy.IsValid() {
return !vx.IsValid() && vy.IsValid()
}
tx, ty := vx.Type(), vy.Type()
if tx == ty {
return isLess(x.Elem(), y.Elem())
}
if tx.Kind() != ty.Kind() {
return vx.Kind() < vy.Kind()
}
if tx.String() != ty.String() {
return tx.String() < ty.String()
}
if tx.PkgPath() != ty.PkgPath() {
return tx.PkgPath() < ty.PkgPath()
}
// This can happen in rare situations, so we fallback to just comparing
// the unique pointer for a reflect.Type. This guarantees deterministic
// ordering within a program, but it is obviously not stable.
return reflect.ValueOf(vx.Type()).Pointer() < reflect.ValueOf(vy.Type()).Pointer()
default:
// Must be Func, Map, or Slice; which are not comparable.
panic(fmt.Sprintf("%T is not comparable", x.Type()))
}
}

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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
package cmp
import (
"fmt"
"reflect"
"runtime"
"strings"
"github.com/google/go-cmp/cmp/internal/function"
)
// Option configures for specific behavior of Equal and Diff. In particular,
// the fundamental Option functions (Ignore, Transformer, and Comparer),
// configure how equality is determined.
//
// The fundamental options may be composed with filters (FilterPath and
// FilterValues) to control the scope over which they are applied.
//
// The cmp/cmpopts package provides helper functions for creating options that
// may be used with Equal and Diff.
type Option interface {
// filter applies all filters and returns the option that remains.
// Each option may only read s.curPath and call s.callTTBFunc.
//
// An Options is returned only if multiple comparers or transformers
// can apply simultaneously and will only contain values of those types
// or sub-Options containing values of those types.
filter(s *state, vx, vy reflect.Value, t reflect.Type) applicableOption
}
// applicableOption represents the following types:
// Fundamental: ignore | invalid | *comparer | *transformer
// Grouping: Options
type applicableOption interface {
Option
// apply executes the option, which may mutate s or panic.
apply(s *state, vx, vy reflect.Value)
}
// coreOption represents the following types:
// Fundamental: ignore | invalid | *comparer | *transformer
// Filters: *pathFilter | *valuesFilter
type coreOption interface {
Option
isCore()
}
type core struct{}
func (core) isCore() {}
// Options is a list of Option values that also satisfies the Option interface.
// Helper comparison packages may return an Options value when packing multiple
// Option values into a single Option. When this package processes an Options,
// it will be implicitly expanded into a flat list.
//
// Applying a filter on an Options is equivalent to applying that same filter
// on all individual options held within.
type Options []Option
func (opts Options) filter(s *state, vx, vy reflect.Value, t reflect.Type) (out applicableOption) {
for _, opt := range opts {
switch opt := opt.filter(s, vx, vy, t); opt.(type) {
case ignore:
return ignore{} // Only ignore can short-circuit evaluation
case invalid:
out = invalid{} // Takes precedence over comparer or transformer
case *comparer, *transformer, Options:
switch out.(type) {
case nil:
out = opt
case invalid:
// Keep invalid
case *comparer, *transformer, Options:
out = Options{out, opt} // Conflicting comparers or transformers
}
}
}
return out
}
func (opts Options) apply(s *state, _, _ reflect.Value) {
const warning = "ambiguous set of applicable options"
const help = "consider using filters to ensure at most one Comparer or Transformer may apply"
var ss []string
for _, opt := range flattenOptions(nil, opts) {
ss = append(ss, fmt.Sprint(opt))
}
set := strings.Join(ss, "\n\t")
panic(fmt.Sprintf("%s at %#v:\n\t%s\n%s", warning, s.curPath, set, help))
}
func (opts Options) String() string {
var ss []string
for _, opt := range opts {
ss = append(ss, fmt.Sprint(opt))
}
return fmt.Sprintf("Options{%s}", strings.Join(ss, ", "))
}
// FilterPath returns a new Option where opt is only evaluated if filter f
// returns true for the current Path in the value tree.
//
// The option passed in may be an Ignore, Transformer, Comparer, Options, or
// a previously filtered Option.
func FilterPath(f func(Path) bool, opt Option) Option {
if f == nil {
panic("invalid path filter function")
}
if opt := normalizeOption(opt); opt != nil {
return &pathFilter{fnc: f, opt: opt}
}
return nil
}
type pathFilter struct {
core
fnc func(Path) bool
opt Option
}
func (f pathFilter) filter(s *state, vx, vy reflect.Value, t reflect.Type) applicableOption {
if f.fnc(s.curPath) {
return f.opt.filter(s, vx, vy, t)
}
return nil
}
func (f pathFilter) String() string {
fn := getFuncName(reflect.ValueOf(f.fnc).Pointer())
return fmt.Sprintf("FilterPath(%s, %v)", fn, f.opt)
}
// FilterValues returns a new Option where opt is only evaluated if filter f,
// which is a function of the form "func(T, T) bool", returns true for the
// current pair of values being compared. If the type of the values is not
// assignable to T, then this filter implicitly returns false.
//
// The filter function must be
// symmetric (i.e., agnostic to the order of the inputs) and
// deterministic (i.e., produces the same result when given the same inputs).
// If T is an interface, it is possible that f is called with two values with
// different concrete types that both implement T.
//
// The option passed in may be an Ignore, Transformer, Comparer, Options, or
// a previously filtered Option.
func FilterValues(f interface{}, opt Option) Option {
v := reflect.ValueOf(f)
if !function.IsType(v.Type(), function.ValueFilter) || v.IsNil() {
panic(fmt.Sprintf("invalid values filter function: %T", f))
}
if opt := normalizeOption(opt); opt != nil {
vf := &valuesFilter{fnc: v, opt: opt}
if ti := v.Type().In(0); ti.Kind() != reflect.Interface || ti.NumMethod() > 0 {
vf.typ = ti
}
return vf
}
return nil
}
type valuesFilter struct {
core
typ reflect.Type // T
fnc reflect.Value // func(T, T) bool
opt Option
}
func (f valuesFilter) filter(s *state, vx, vy reflect.Value, t reflect.Type) applicableOption {
if !vx.IsValid() || !vy.IsValid() {
return invalid{}
}
if (f.typ == nil || t.AssignableTo(f.typ)) && s.callTTBFunc(f.fnc, vx, vy) {
return f.opt.filter(s, vx, vy, t)
}
return nil
}
func (f valuesFilter) String() string {
fn := getFuncName(f.fnc.Pointer())
return fmt.Sprintf("FilterValues(%s, %v)", fn, f.opt)
}
// Ignore is an Option that causes all comparisons to be ignored.
// This value is intended to be combined with FilterPath or FilterValues.
// It is an error to pass an unfiltered Ignore option to Equal.
func Ignore() Option { return ignore{} }
type ignore struct{ core }
func (ignore) isFiltered() bool { return false }
func (ignore) filter(_ *state, _, _ reflect.Value, _ reflect.Type) applicableOption { return ignore{} }
func (ignore) apply(_ *state, _, _ reflect.Value) { return }
func (ignore) String() string { return "Ignore()" }
// invalid is a sentinel Option type to indicate that some options could not
// be evaluated due to unexported fields.
type invalid struct{ core }
func (invalid) filter(_ *state, _, _ reflect.Value, _ reflect.Type) applicableOption { return invalid{} }
func (invalid) apply(s *state, _, _ reflect.Value) {
const help = "consider using AllowUnexported or cmpopts.IgnoreUnexported"
panic(fmt.Sprintf("cannot handle unexported field: %#v\n%s", s.curPath, help))
}
// Transformer returns an Option that applies a transformation function that
// converts values of a certain type into that of another.
//
// The transformer f must be a function "func(T) R" that converts values of
// type T to those of type R and is implicitly filtered to input values
// assignable to T. The transformer must not mutate T in any way.
//
// To help prevent some cases of infinite recursive cycles applying the
// same transform to the output of itself (e.g., in the case where the
// input and output types are the same), an implicit filter is added such that
// a transformer is applicable only if that exact transformer is not already
// in the tail of the Path since the last non-Transform step.
//
// The name is a user provided label that is used as the Transform.Name in the
// transformation PathStep. If empty, an arbitrary name is used.
func Transformer(name string, f interface{}) Option {
v := reflect.ValueOf(f)
if !function.IsType(v.Type(), function.Transformer) || v.IsNil() {
panic(fmt.Sprintf("invalid transformer function: %T", f))
}
if name == "" {
name = "λ" // Lambda-symbol as place-holder for anonymous transformer
}
if !isValid(name) {
panic(fmt.Sprintf("invalid name: %q", name))
}
tr := &transformer{name: name, fnc: reflect.ValueOf(f)}
if ti := v.Type().In(0); ti.Kind() != reflect.Interface || ti.NumMethod() > 0 {
tr.typ = ti
}
return tr
}
type transformer struct {
core
name string
typ reflect.Type // T
fnc reflect.Value // func(T) R
}
func (tr *transformer) isFiltered() bool { return tr.typ != nil }
func (tr *transformer) filter(s *state, _, _ reflect.Value, t reflect.Type) applicableOption {
for i := len(s.curPath) - 1; i >= 0; i-- {
if t, ok := s.curPath[i].(*transform); !ok {
break // Hit most recent non-Transform step
} else if tr == t.trans {
return nil // Cannot directly use same Transform
}
}
if tr.typ == nil || t.AssignableTo(tr.typ) {
return tr
}
return nil
}
func (tr *transformer) apply(s *state, vx, vy reflect.Value) {
// Update path before calling the Transformer so that dynamic checks
// will use the updated path.
s.curPath.push(&transform{pathStep{tr.fnc.Type().Out(0)}, tr})
defer s.curPath.pop()
vx = s.callTRFunc(tr.fnc, vx)
vy = s.callTRFunc(tr.fnc, vy)
s.compareAny(vx, vy)
}
func (tr transformer) String() string {
return fmt.Sprintf("Transformer(%s, %s)", tr.name, getFuncName(tr.fnc.Pointer()))
}
// Comparer returns an Option that determines whether two values are equal
// to each other.
//
// The comparer f must be a function "func(T, T) bool" and is implicitly
// filtered to input values assignable to T. If T is an interface, it is
// possible that f is called with two values of different concrete types that
// both implement T.
//
// The equality function must be:
// • Symmetric: equal(x, y) == equal(y, x)
// • Deterministic: equal(x, y) == equal(x, y)
// • Pure: equal(x, y) does not modify x or y
func Comparer(f interface{}) Option {
v := reflect.ValueOf(f)
if !function.IsType(v.Type(), function.Equal) || v.IsNil() {
panic(fmt.Sprintf("invalid comparer function: %T", f))
}
cm := &comparer{fnc: v}
if ti := v.Type().In(0); ti.Kind() != reflect.Interface || ti.NumMethod() > 0 {
cm.typ = ti
}
return cm
}
type comparer struct {
core
typ reflect.Type // T
fnc reflect.Value // func(T, T) bool
}
func (cm *comparer) isFiltered() bool { return cm.typ != nil }
func (cm *comparer) filter(_ *state, _, _ reflect.Value, t reflect.Type) applicableOption {
if cm.typ == nil || t.AssignableTo(cm.typ) {
return cm
}
return nil
}
func (cm *comparer) apply(s *state, vx, vy reflect.Value) {
eq := s.callTTBFunc(cm.fnc, vx, vy)
s.report(eq, vx, vy)
}
func (cm comparer) String() string {
return fmt.Sprintf("Comparer(%s)", getFuncName(cm.fnc.Pointer()))
}
// AllowUnexported returns an Option that forcibly allows operations on
// unexported fields in certain structs, which are specified by passing in a
// value of each struct type.
//
// Users of this option must understand that comparing on unexported fields
// from external packages is not safe since changes in the internal
// implementation of some external package may cause the result of Equal
// to unexpectedly change. However, it may be valid to use this option on types
// defined in an internal package where the semantic meaning of an unexported
// field is in the control of the user.
//
// For some cases, a custom Comparer should be used instead that defines
// equality as a function of the public API of a type rather than the underlying
// unexported implementation.
//
// For example, the reflect.Type documentation defines equality to be determined
// by the == operator on the interface (essentially performing a shallow pointer
// comparison) and most attempts to compare *regexp.Regexp types are interested
// in only checking that the regular expression strings are equal.
// Both of these are accomplished using Comparers:
//
// Comparer(func(x, y reflect.Type) bool { return x == y })
// Comparer(func(x, y *regexp.Regexp) bool { return x.String() == y.String() })
//
// In other cases, the cmpopts.IgnoreUnexported option can be used to ignore
// all unexported fields on specified struct types.
func AllowUnexported(types ...interface{}) Option {
if !supportAllowUnexported {
panic("AllowUnexported is not supported on purego builds, Google App Engine Standard, or GopherJS")
}
m := make(map[reflect.Type]bool)
for _, typ := range types {
t := reflect.TypeOf(typ)
if t.Kind() != reflect.Struct {
panic(fmt.Sprintf("invalid struct type: %T", typ))
}
m[t] = true
}
return visibleStructs(m)
}
type visibleStructs map[reflect.Type]bool
func (visibleStructs) filter(_ *state, _, _ reflect.Value, _ reflect.Type) applicableOption {
panic("not implemented")
}
// reporter is an Option that configures how differences are reported.
type reporter interface {
// TODO: Not exported yet.
//
// Perhaps add PushStep and PopStep and change Report to only accept
// a PathStep instead of the full-path? Adding a PushStep and PopStep makes
// it clear that we are traversing the value tree in a depth-first-search
// manner, which has an effect on how values are printed.
Option
// Report is called for every comparison made and will be provided with
// the two values being compared, the equality result, and the
// current path in the value tree. It is possible for x or y to be an
// invalid reflect.Value if one of the values is non-existent;
// which is possible with maps and slices.
Report(x, y reflect.Value, eq bool, p Path)
}
// normalizeOption normalizes the input options such that all Options groups
// are flattened and groups with a single element are reduced to that element.
// Only coreOptions and Options containing coreOptions are allowed.
func normalizeOption(src Option) Option {
switch opts := flattenOptions(nil, Options{src}); len(opts) {
case 0:
return nil
case 1:
return opts[0]
default:
return opts
}
}
// flattenOptions copies all options in src to dst as a flat list.
// Only coreOptions and Options containing coreOptions are allowed.
func flattenOptions(dst, src Options) Options {
for _, opt := range src {
switch opt := opt.(type) {
case nil:
continue
case Options:
dst = flattenOptions(dst, opt)
case coreOption:
dst = append(dst, opt)
default:
panic(fmt.Sprintf("invalid option type: %T", opt))
}
}
return dst
}
// getFuncName returns a short function name from the pointer.
// The string parsing logic works up until Go1.9.
func getFuncName(p uintptr) string {
fnc := runtime.FuncForPC(p)
if fnc == nil {
return "<unknown>"
}
name := fnc.Name() // E.g., "long/path/name/mypkg.(mytype).(long/path/name/mypkg.myfunc)-fm"
if strings.HasSuffix(name, ")-fm") || strings.HasSuffix(name, ")·fm") {
// Strip the package name from method name.
name = strings.TrimSuffix(name, ")-fm")
name = strings.TrimSuffix(name, ")·fm")
if i := strings.LastIndexByte(name, '('); i >= 0 {
methodName := name[i+1:] // E.g., "long/path/name/mypkg.myfunc"
if j := strings.LastIndexByte(methodName, '.'); j >= 0 {
methodName = methodName[j+1:] // E.g., "myfunc"
}
name = name[:i] + methodName // E.g., "long/path/name/mypkg.(mytype)." + "myfunc"
}
}
if i := strings.LastIndexByte(name, '/'); i >= 0 {
// Strip the package name.
name = name[i+1:] // E.g., "mypkg.(mytype).myfunc"
}
return name
}

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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
package cmp
import (
"fmt"
"reflect"
"strings"
"unicode"
"unicode/utf8"
)
type (
// Path is a list of PathSteps describing the sequence of operations to get
// from some root type to the current position in the value tree.
// The first Path element is always an operation-less PathStep that exists
// simply to identify the initial type.
//
// When traversing structs with embedded structs, the embedded struct will
// always be accessed as a field before traversing the fields of the
// embedded struct themselves. That is, an exported field from the
// embedded struct will never be accessed directly from the parent struct.
Path []PathStep
// PathStep is a union-type for specific operations to traverse
// a value's tree structure. Users of this package never need to implement
// these types as values of this type will be returned by this package.
PathStep interface {
String() string
Type() reflect.Type // Resulting type after performing the path step
isPathStep()
}
// SliceIndex is an index operation on a slice or array at some index Key.
SliceIndex interface {
PathStep
Key() int // May return -1 if in a split state
// SplitKeys returns the indexes for indexing into slices in the
// x and y values, respectively. These indexes may differ due to the
// insertion or removal of an element in one of the slices, causing
// all of the indexes to be shifted. If an index is -1, then that
// indicates that the element does not exist in the associated slice.
//
// Key is guaranteed to return -1 if and only if the indexes returned
// by SplitKeys are not the same. SplitKeys will never return -1 for
// both indexes.
SplitKeys() (x int, y int)
isSliceIndex()
}
// MapIndex is an index operation on a map at some index Key.
MapIndex interface {
PathStep
Key() reflect.Value
isMapIndex()
}
// TypeAssertion represents a type assertion on an interface.
TypeAssertion interface {
PathStep
isTypeAssertion()
}
// StructField represents a struct field access on a field called Name.
StructField interface {
PathStep
Name() string
Index() int
isStructField()
}
// Indirect represents pointer indirection on the parent type.
Indirect interface {
PathStep
isIndirect()
}
// Transform is a transformation from the parent type to the current type.
Transform interface {
PathStep
Name() string
Func() reflect.Value
// Option returns the originally constructed Transformer option.
// The == operator can be used to detect the exact option used.
Option() Option
isTransform()
}
)
func (pa *Path) push(s PathStep) {
*pa = append(*pa, s)
}
func (pa *Path) pop() {
*pa = (*pa)[:len(*pa)-1]
}
// Last returns the last PathStep in the Path.
// If the path is empty, this returns a non-nil PathStep that reports a nil Type.
func (pa Path) Last() PathStep {
return pa.Index(-1)
}
// Index returns the ith step in the Path and supports negative indexing.
// A negative index starts counting from the tail of the Path such that -1
// refers to the last step, -2 refers to the second-to-last step, and so on.
// If index is invalid, this returns a non-nil PathStep that reports a nil Type.
func (pa Path) Index(i int) PathStep {
if i < 0 {
i = len(pa) + i
}
if i < 0 || i >= len(pa) {
return pathStep{}
}
return pa[i]
}
// String returns the simplified path to a node.
// The simplified path only contains struct field accesses.
//
// For example:
// MyMap.MySlices.MyField
func (pa Path) String() string {
var ss []string
for _, s := range pa {
if _, ok := s.(*structField); ok {
ss = append(ss, s.String())
}
}
return strings.TrimPrefix(strings.Join(ss, ""), ".")
}
// GoString returns the path to a specific node using Go syntax.
//
// For example:
// (*root.MyMap["key"].(*mypkg.MyStruct).MySlices)[2][3].MyField
func (pa Path) GoString() string {
var ssPre, ssPost []string
var numIndirect int
for i, s := range pa {
var nextStep PathStep
if i+1 < len(pa) {
nextStep = pa[i+1]
}
switch s := s.(type) {
case *indirect:
numIndirect++
pPre, pPost := "(", ")"
switch nextStep.(type) {
case *indirect:
continue // Next step is indirection, so let them batch up
case *structField:
numIndirect-- // Automatic indirection on struct fields
case nil:
pPre, pPost = "", "" // Last step; no need for parenthesis
}
if numIndirect > 0 {
ssPre = append(ssPre, pPre+strings.Repeat("*", numIndirect))
ssPost = append(ssPost, pPost)
}
numIndirect = 0
continue
case *transform:
ssPre = append(ssPre, s.trans.name+"(")
ssPost = append(ssPost, ")")
continue
case *typeAssertion:
// As a special-case, elide type assertions on anonymous types
// since they are typically generated dynamically and can be very
// verbose. For example, some transforms return interface{} because
// of Go's lack of generics, but typically take in and return the
// exact same concrete type.
if s.Type().PkgPath() == "" {
continue
}
}
ssPost = append(ssPost, s.String())
}
for i, j := 0, len(ssPre)-1; i < j; i, j = i+1, j-1 {
ssPre[i], ssPre[j] = ssPre[j], ssPre[i]
}
return strings.Join(ssPre, "") + strings.Join(ssPost, "")
}
type (
pathStep struct {
typ reflect.Type
}
sliceIndex struct {
pathStep
xkey, ykey int
}
mapIndex struct {
pathStep
key reflect.Value
}
typeAssertion struct {
pathStep
}
structField struct {
pathStep
name string
idx int
// These fields are used for forcibly accessing an unexported field.
// pvx, pvy, and field are only valid if unexported is true.
unexported bool
force bool // Forcibly allow visibility
pvx, pvy reflect.Value // Parent values
field reflect.StructField // Field information
}
indirect struct {
pathStep
}
transform struct {
pathStep
trans *transformer
}
)
func (ps pathStep) Type() reflect.Type { return ps.typ }
func (ps pathStep) String() string {
if ps.typ == nil {
return "<nil>"
}
s := ps.typ.String()
if s == "" || strings.ContainsAny(s, "{}\n") {
return "root" // Type too simple or complex to print
}
return fmt.Sprintf("{%s}", s)
}
func (si sliceIndex) String() string {
switch {
case si.xkey == si.ykey:
return fmt.Sprintf("[%d]", si.xkey)
case si.ykey == -1:
// [5->?] means "I don't know where X[5] went"
return fmt.Sprintf("[%d->?]", si.xkey)
case si.xkey == -1:
// [?->3] means "I don't know where Y[3] came from"
return fmt.Sprintf("[?->%d]", si.ykey)
default:
// [5->3] means "X[5] moved to Y[3]"
return fmt.Sprintf("[%d->%d]", si.xkey, si.ykey)
}
}
func (mi mapIndex) String() string { return fmt.Sprintf("[%#v]", mi.key) }
func (ta typeAssertion) String() string { return fmt.Sprintf(".(%v)", ta.typ) }
func (sf structField) String() string { return fmt.Sprintf(".%s", sf.name) }
func (in indirect) String() string { return "*" }
func (tf transform) String() string { return fmt.Sprintf("%s()", tf.trans.name) }
func (si sliceIndex) Key() int {
if si.xkey != si.ykey {
return -1
}
return si.xkey
}
func (si sliceIndex) SplitKeys() (x, y int) { return si.xkey, si.ykey }
func (mi mapIndex) Key() reflect.Value { return mi.key }
func (sf structField) Name() string { return sf.name }
func (sf structField) Index() int { return sf.idx }
func (tf transform) Name() string { return tf.trans.name }
func (tf transform) Func() reflect.Value { return tf.trans.fnc }
func (tf transform) Option() Option { return tf.trans }
func (pathStep) isPathStep() {}
func (sliceIndex) isSliceIndex() {}
func (mapIndex) isMapIndex() {}
func (typeAssertion) isTypeAssertion() {}
func (structField) isStructField() {}
func (indirect) isIndirect() {}
func (transform) isTransform() {}
var (
_ SliceIndex = sliceIndex{}
_ MapIndex = mapIndex{}
_ TypeAssertion = typeAssertion{}
_ StructField = structField{}
_ Indirect = indirect{}
_ Transform = transform{}
_ PathStep = sliceIndex{}
_ PathStep = mapIndex{}
_ PathStep = typeAssertion{}
_ PathStep = structField{}
_ PathStep = indirect{}
_ PathStep = transform{}
)
// isExported reports whether the identifier is exported.
func isExported(id string) bool {
r, _ := utf8.DecodeRuneInString(id)
return unicode.IsUpper(r)
}
// isValid reports whether the identifier is valid.
// Empty and underscore-only strings are not valid.
func isValid(id string) bool {
ok := id != "" && id != "_"
for j, c := range id {
ok = ok && (j > 0 || !unicode.IsDigit(c))
ok = ok && (c == '_' || unicode.IsLetter(c) || unicode.IsDigit(c))
}
return ok
}

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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
package cmp
import (
"fmt"
"reflect"
"strings"
"github.com/google/go-cmp/cmp/internal/value"
)
type defaultReporter struct {
Option
diffs []string // List of differences, possibly truncated
ndiffs int // Total number of differences
nbytes int // Number of bytes in diffs
nlines int // Number of lines in diffs
}
var _ reporter = (*defaultReporter)(nil)
func (r *defaultReporter) Report(x, y reflect.Value, eq bool, p Path) {
if eq {
return // Ignore equal results
}
const maxBytes = 4096
const maxLines = 256
r.ndiffs++
if r.nbytes < maxBytes && r.nlines < maxLines {
sx := value.Format(x, value.FormatConfig{UseStringer: true})
sy := value.Format(y, value.FormatConfig{UseStringer: true})
if sx == sy {
// Unhelpful output, so use more exact formatting.
sx = value.Format(x, value.FormatConfig{PrintPrimitiveType: true})
sy = value.Format(y, value.FormatConfig{PrintPrimitiveType: true})
}
s := fmt.Sprintf("%#v:\n\t-: %s\n\t+: %s\n", p, sx, sy)
r.diffs = append(r.diffs, s)
r.nbytes += len(s)
r.nlines += strings.Count(s, "\n")
}
}
func (r *defaultReporter) String() string {
s := strings.Join(r.diffs, "")
if r.ndiffs == len(r.diffs) {
return s
}
return fmt.Sprintf("%s... %d more differences ...", s, r.ndiffs-len(r.diffs))
}

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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// +build purego appengine js
package cmp
import "reflect"
const supportAllowUnexported = false
func unsafeRetrieveField(reflect.Value, reflect.StructField) reflect.Value {
panic("unsafeRetrieveField is not implemented")
}

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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
// +build !purego,!appengine,!js
package cmp
import (
"reflect"
"unsafe"
)
const supportAllowUnexported = true
// unsafeRetrieveField uses unsafe to forcibly retrieve any field from a struct
// such that the value has read-write permissions.
//
// The parent struct, v, must be addressable, while f must be a StructField
// describing the field to retrieve.
func unsafeRetrieveField(v reflect.Value, f reflect.StructField) reflect.Value {
return reflect.NewAt(f.Type, unsafe.Pointer(v.UnsafeAddr()+f.Offset)).Elem()
}

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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
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on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
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APPENDIX: How to apply the Apache License to your work.
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
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# Go Test Yourself
A collection of packages compatible with `go test` to support common testing
patterns.
[![GoDoc](https://godoc.org/github.com/gotestyourself/gotestyourself?status.svg)](https://godoc.org/github.com/gotestyourself/gotestyourself)
[![CircleCI](https://circleci.com/gh/gotestyourself/gotestyourself/tree/master.svg?style=shield)](https://circleci.com/gh/gotestyourself/gotestyourself/tree/master)
[![Go Reportcard](https://goreportcard.com/badge/github.com/gotestyourself/gotestyourself)](https://goreportcard.com/report/github.com/gotestyourself/gotestyourself)
## Packages
* [assert](http://godoc.org/github.com/gotestyourself/gotestyourself/assert) -
compare values and fail the test when the comparison fails
* [env](http://godoc.org/github.com/gotestyourself/gotestyourself/env) -
test code that uses environment variables
* [fs](http://godoc.org/github.com/gotestyourself/gotestyourself/fs) -
create test files and directories
* [golden](http://godoc.org/github.com/gotestyourself/gotestyourself/golden) -
compare large multi-line strings
* [icmd](http://godoc.org/github.com/gotestyourself/gotestyourself/icmd) -
execute binaries and test the output
* [poll](http://godoc.org/github.com/gotestyourself/gotestyourself/poll) -
test asynchronous code by polling until a desired state is reached
* [skip](http://godoc.org/github.com/gotestyourself/gotestyourself/skip) -
skip tests based on conditions
* [testsum](http://godoc.org/github.com/gotestyourself/gotestyourself/testsum) -
a program to summarize `go test` output and test failures
## Related
* [maxbrunsfeld/counterfeiter](https://github.com/maxbrunsfeld/counterfeiter) - generate fakes for interfaces
* [jonboulle/clockwork](https://github.com/jonboulle/clockwork) - a fake clock for testing code that uses `time`

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/*Package assert provides assertions for comparing expected values to actual
values. When an assertion fails a helpful error message is printed.
Assert and Check
Assert() and Check() both accept a Comparison, and fail the test when the
comparison fails. The one difference is that Assert() will end the test execution
immediately (using t.FailNow()) whereas Check() will fail the test (using t.Fail()),
return the value of the comparison, then proceed with the rest of the test case.
Example Usage
The example below shows assert used with some common types.
import (
"testing"
"github.com/gotestyourself/gotestyourself/assert"
is "github.com/gotestyourself/gotestyourself/assert/cmp"
)
func TestEverything(t *testing.T) {
// booleans
assert.Assert(t, ok)
assert.Assert(t, !missing)
// primitives
assert.Equal(t, count, 1)
assert.Equal(t, msg, "the message")
assert.Assert(t, total != 10) // NotEqual
// errors
assert.NilError(t, closer.Close())
assert.Error(t, err, "the exact error message")
assert.ErrorContains(t, err, "includes this")
assert.ErrorType(t, err, os.IsNotExist)
// complex types
assert.DeepEqual(t, result, myStruct{Name: "title"})
assert.Assert(t, is.Len(items, 3))
assert.Assert(t, len(sequence) != 0) // NotEmpty
assert.Assert(t, is.Contains(mapping, "key"))
// pointers and interface
assert.Assert(t, is.Nil(ref))
assert.Assert(t, ref != nil) // NotNil
}
Comparisons
https://godoc.org/github.com/gotestyourself/gotestyourself/assert/cmp provides
many common comparisons. Additional comparisons can be written to compare
values in other ways. See the example Assert (CustomComparison).
*/
package assert
import (
"fmt"
"go/ast"
"go/token"
gocmp "github.com/google/go-cmp/cmp"
"github.com/gotestyourself/gotestyourself/assert/cmp"
"github.com/gotestyourself/gotestyourself/internal/format"
"github.com/gotestyourself/gotestyourself/internal/source"
)
// BoolOrComparison can be a bool, or cmp.Comparison. See Assert() for usage.
type BoolOrComparison interface{}
// TestingT is the subset of testing.T used by the assert package.
type TestingT interface {
FailNow()
Fail()
Log(args ...interface{})
}
type helperT interface {
Helper()
}
const failureMessage = "assertion failed: "
// nolint: gocyclo
func assert(
t TestingT,
failer func(),
argSelector argSelector,
comparison BoolOrComparison,
msgAndArgs ...interface{},
) bool {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
var success bool
switch check := comparison.(type) {
case bool:
if check {
return true
}
logFailureFromBool(t, msgAndArgs...)
// Undocumented legacy comparison without Result type
case func() (success bool, message string):
success = runCompareFunc(t, check, msgAndArgs...)
case nil:
return true
case error:
msg := "error is not nil: "
t.Log(format.WithCustomMessage(failureMessage+msg+check.Error(), msgAndArgs...))
case cmp.Comparison:
success = runComparison(t, argSelector, check, msgAndArgs...)
case func() cmp.Result:
success = runComparison(t, argSelector, check, msgAndArgs...)
default:
t.Log(fmt.Sprintf("invalid Comparison: %v (%T)", check, check))
}
if success {
return true
}
failer()
return false
}
func runCompareFunc(
t TestingT,
f func() (success bool, message string),
msgAndArgs ...interface{},
) bool {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
if success, message := f(); !success {
t.Log(format.WithCustomMessage(failureMessage+message, msgAndArgs...))
return false
}
return true
}
func logFailureFromBool(t TestingT, msgAndArgs ...interface{}) {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
const stackIndex = 3 // Assert()/Check(), assert(), formatFailureFromBool()
const comparisonArgPos = 1
args, err := source.CallExprArgs(stackIndex)
if err != nil {
t.Log(err.Error())
return
}
msg, err := boolFailureMessage(args[comparisonArgPos])
if err != nil {
t.Log(err.Error())
msg = "expression is false"
}
t.Log(format.WithCustomMessage(failureMessage+msg, msgAndArgs...))
}
func boolFailureMessage(expr ast.Expr) (string, error) {
if binaryExpr, ok := expr.(*ast.BinaryExpr); ok && binaryExpr.Op == token.NEQ {
x, err := source.FormatNode(binaryExpr.X)
if err != nil {
return "", err
}
y, err := source.FormatNode(binaryExpr.Y)
if err != nil {
return "", err
}
return x + " is " + y, nil
}
if unaryExpr, ok := expr.(*ast.UnaryExpr); ok && unaryExpr.Op == token.NOT {
x, err := source.FormatNode(unaryExpr.X)
if err != nil {
return "", err
}
return x + " is true", nil
}
formatted, err := source.FormatNode(expr)
if err != nil {
return "", err
}
return "expression is false: " + formatted, nil
}
// Assert performs a comparison. If the comparison fails the test is marked as
// failed, a failure message is logged, and execution is stopped immediately.
//
// The comparison argument may be one of three types: bool, cmp.Comparison or
// error.
// When called with a bool the failure message will contain the literal source
// code of the expression.
// When called with a cmp.Comparison the comparison is responsible for producing
// a helpful failure message.
// When called with an error a nil value is considered success. A non-nil error
// is a failure, and Error() is used as the failure message.
func Assert(t TestingT, comparison BoolOrComparison, msgAndArgs ...interface{}) {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
assert(t, t.FailNow, argsFromComparisonCall, comparison, msgAndArgs...)
}
// Check performs a comparison. If the comparison fails the test is marked as
// failed, a failure message is logged, and Check returns false. Otherwise returns
// true.
//
// See Assert for details about the comparison arg and failure messages.
func Check(t TestingT, comparison BoolOrComparison, msgAndArgs ...interface{}) bool {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
return assert(t, t.Fail, argsFromComparisonCall, comparison, msgAndArgs...)
}
// NilError fails the test immediately if err is not nil.
// This is equivalent to Assert(t, err)
func NilError(t TestingT, err error, msgAndArgs ...interface{}) {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
assert(t, t.FailNow, argsAfterT, err, msgAndArgs...)
}
// Equal uses the == operator to assert two values are equal and fails the test
// if they are not equal. This is equivalent to Assert(t, cmp.Equal(x, y)).
func Equal(t TestingT, x, y interface{}, msgAndArgs ...interface{}) {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
assert(t, t.FailNow, argsAfterT, cmp.Equal(x, y), msgAndArgs...)
}
// DeepEqual uses https://github.com/google/go-cmp/cmp to assert two values
// are equal and fails the test if they are not equal.
// This is equivalent to Assert(t, cmp.DeepEqual(x, y)).
func DeepEqual(t TestingT, x, y interface{}, opts ...gocmp.Option) {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
assert(t, t.FailNow, argsAfterT, cmp.DeepEqual(x, y, opts...))
}
// Error fails the test if err is nil, or the error message is not the expected
// message.
// Equivalent to Assert(t, cmp.Error(err, message)).
func Error(t TestingT, err error, message string, msgAndArgs ...interface{}) {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
assert(t, t.FailNow, argsAfterT, cmp.Error(err, message), msgAndArgs...)
}
// ErrorContains fails the test if err is nil, or the error message does not
// contain the expected substring.
// Equivalent to Assert(t, cmp.ErrorContains(err, substring)).
func ErrorContains(t TestingT, err error, substring string, msgAndArgs ...interface{}) {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
assert(t, t.FailNow, argsAfterT, cmp.ErrorContains(err, substring), msgAndArgs...)
}
// ErrorType fails the test if err is nil, or err is not the expected type.
//
// Expected can be one of:
// a func(error) bool which returns true if the error is the expected type,
// an instance of a struct of the expected type,
// a pointer to an interface the error is expected to implement,
// a reflect.Type of the expected struct or interface.
//
// Equivalent to Assert(t, cmp.ErrorType(err, expected)).
func ErrorType(t TestingT, err error, expected interface{}, msgAndArgs ...interface{}) {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
assert(t, t.FailNow, argsAfterT, cmp.ErrorType(err, expected), msgAndArgs...)
}

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/*Package cmp provides Comparisons for Assert and Check*/
package cmp
import (
"fmt"
"reflect"
"strings"
"github.com/google/go-cmp/cmp"
"github.com/pmezard/go-difflib/difflib"
)
// Comparison is a function which compares values and returns ResultSuccess if
// the actual value matches the expected value. If the values do not match the
// Result will contain a message about why it failed.
type Comparison func() Result
// DeepEqual compares two values using https://godoc.org/github.com/google/go-cmp/cmp
// and succeeds if the values are equal.
//
// The comparison can be customized using comparison Options.
func DeepEqual(x, y interface{}, opts ...cmp.Option) Comparison {
return func() (result Result) {
defer func() {
if panicmsg, handled := handleCmpPanic(recover()); handled {
result = ResultFailure(panicmsg)
}
}()
diff := cmp.Diff(x, y, opts...)
return toResult(diff == "", "\n"+diff)
}
}
func handleCmpPanic(r interface{}) (string, bool) {
if r == nil {
return "", false
}
panicmsg, ok := r.(string)
if !ok {
panic(r)
}
switch {
case strings.HasPrefix(panicmsg, "cannot handle unexported field"):
return panicmsg, true
}
panic(r)
}
func toResult(success bool, msg string) Result {
if success {
return ResultSuccess
}
return ResultFailure(msg)
}
// Equal succeeds if x == y.
func Equal(x, y interface{}) Comparison {
return func() Result {
switch {
case x == y:
return ResultSuccess
case isMultiLineStringCompare(x, y):
return multiLineStringDiffResult(x.(string), y.(string))
}
return ResultFailureTemplate(`
{{- .Data.x}} (
{{- with callArg 0 }}{{ formatNode . }} {{end -}}
{{- printf "%T" .Data.x -}}
) != {{ .Data.y}} (
{{- with callArg 1 }}{{ formatNode . }} {{end -}}
{{- printf "%T" .Data.y -}}
)`,
map[string]interface{}{"x": x, "y": y})
}
}
func isMultiLineStringCompare(x, y interface{}) bool {
strX, ok := x.(string)
if !ok {
return false
}
strY, ok := y.(string)
if !ok {
return false
}
return strings.Contains(strX, "\n") || strings.Contains(strY, "\n")
}
func multiLineStringDiffResult(x, y string) Result {
diff, err := difflib.GetUnifiedDiffString(difflib.UnifiedDiff{
A: difflib.SplitLines(x),
B: difflib.SplitLines(y),
Context: 3,
})
if err != nil {
return ResultFailure(fmt.Sprintf("failed to diff: %s", err))
}
return ResultFailureTemplate(`
--- {{ with callArg 0 }}{{ formatNode . }}{{else}}←{{end}}
+++ {{ with callArg 1 }}{{ formatNode . }}{{else}}→{{end}}
{{ .Data.diff }}`,
map[string]interface{}{"diff": diff})
}
// Len succeeds if the sequence has the expected length.
func Len(seq interface{}, expected int) Comparison {
return func() (result Result) {
defer func() {
if e := recover(); e != nil {
result = ResultFailure(fmt.Sprintf("type %T does not have a length", seq))
}
}()
value := reflect.ValueOf(seq)
length := value.Len()
if length == expected {
return ResultSuccess
}
msg := fmt.Sprintf("expected %s (length %d) to have length %d", seq, length, expected)
return ResultFailure(msg)
}
}
// Contains succeeds if item is in collection. Collection may be a string, map,
// slice, or array.
//
// If collection is a string, item must also be a string, and is compared using
// strings.Contains().
// If collection is a Map, contains will succeed if item is a key in the map.
// If collection is a slice or array, item is compared to each item in the
// sequence using reflect.DeepEqual().
func Contains(collection interface{}, item interface{}) Comparison {
return func() Result {
colValue := reflect.ValueOf(collection)
if !colValue.IsValid() {
return ResultFailure(fmt.Sprintf("nil does not contain items"))
}
msg := fmt.Sprintf("%v does not contain %v", collection, item)
itemValue := reflect.ValueOf(item)
switch colValue.Type().Kind() {
case reflect.String:
if itemValue.Type().Kind() != reflect.String {
return ResultFailure("string may only contain strings")
}
return toResult(
strings.Contains(colValue.String(), itemValue.String()),
fmt.Sprintf("string %q does not contain %q", collection, item))
case reflect.Map:
if itemValue.Type() != colValue.Type().Key() {
return ResultFailure(fmt.Sprintf(
"%v can not contain a %v key", colValue.Type(), itemValue.Type()))
}
return toResult(colValue.MapIndex(itemValue).IsValid(), msg)
case reflect.Slice, reflect.Array:
for i := 0; i < colValue.Len(); i++ {
if reflect.DeepEqual(colValue.Index(i).Interface(), item) {
return ResultSuccess
}
}
return ResultFailure(msg)
default:
return ResultFailure(fmt.Sprintf("type %T does not contain items", collection))
}
}
}
// Panics succeeds if f() panics.
func Panics(f func()) Comparison {
return func() (result Result) {
defer func() {
if err := recover(); err != nil {
result = ResultSuccess
}
}()
f()
return ResultFailure("did not panic")
}
}
// Error succeeds if err is a non-nil error, and the error message equals the
// expected message.
func Error(err error, message string) Comparison {
return func() Result {
switch {
case err == nil:
return ResultFailure("expected an error, got nil")
case err.Error() != message:
return ResultFailure(fmt.Sprintf(
"expected error %q, got %+v", message, err))
}
return ResultSuccess
}
}
// ErrorContains succeeds if err is a non-nil error, and the error message contains
// the expected substring.
func ErrorContains(err error, substring string) Comparison {
return func() Result {
switch {
case err == nil:
return ResultFailure("expected an error, got nil")
case !strings.Contains(err.Error(), substring):
return ResultFailure(fmt.Sprintf(
"expected error to contain %q, got %+v", substring, err))
}
return ResultSuccess
}
}
// Nil succeeds if obj is a nil interface, pointer, or function.
//
// Use NilError() for comparing errors. Use Len(obj, 0) for comparing slices,
// maps, and channels.
func Nil(obj interface{}) Comparison {
msgFunc := func(value reflect.Value) string {
return fmt.Sprintf("%v (type %s) is not nil", reflect.Indirect(value), value.Type())
}
return isNil(obj, msgFunc)
}
func isNil(obj interface{}, msgFunc func(reflect.Value) string) Comparison {
return func() Result {
if obj == nil {
return ResultSuccess
}
value := reflect.ValueOf(obj)
kind := value.Type().Kind()
if kind >= reflect.Chan && kind <= reflect.Slice {
if value.IsNil() {
return ResultSuccess
}
return ResultFailure(msgFunc(value))
}
return ResultFailure(fmt.Sprintf("%v (type %s) can not be nil", value, value.Type()))
}
}
// ErrorType succeeds if err is not nil and is of the expected type.
//
// Expected can be one of:
// a func(error) bool which returns true if the error is the expected type,
// an instance of a struct of the expected type,
// a pointer to an interface the error is expected to implement,
// a reflect.Type of the expected struct or interface.
func ErrorType(err error, expected interface{}) Comparison {
return func() Result {
switch expectedType := expected.(type) {
case func(error) bool:
return cmpErrorTypeFunc(err, expectedType)
case reflect.Type:
if expectedType.Kind() == reflect.Interface {
return cmpErrorTypeImplementsType(err, expectedType)
}
return cmpErrorTypeEqualType(err, expectedType)
case nil:
return ResultFailure(fmt.Sprintf("invalid type for expected: nil"))
}
expectedType := reflect.TypeOf(expected)
switch {
case expectedType.Kind() == reflect.Struct:
return cmpErrorTypeEqualType(err, expectedType)
case isPtrToInterface(expectedType):
return cmpErrorTypeImplementsType(err, expectedType.Elem())
}
return ResultFailure(fmt.Sprintf("invalid type for expected: %T", expected))
}
}
func cmpErrorTypeFunc(err error, f func(error) bool) Result {
if f(err) {
return ResultSuccess
}
actual := "nil"
if err != nil {
actual = fmt.Sprintf("%s (%T)", err, err)
}
return ResultFailureTemplate(`error is {{ .Data.actual }}
{{- with callArg 1 }}, not {{ formatNode . }}{{end -}}`,
map[string]interface{}{"actual": actual})
}
func cmpErrorTypeEqualType(err error, expectedType reflect.Type) Result {
if err == nil {
return ResultFailure(fmt.Sprintf("error is nil, not %s", expectedType))
}
errValue := reflect.ValueOf(err)
if errValue.Type() == expectedType {
return ResultSuccess
}
return ResultFailure(fmt.Sprintf("error is %s (%T), not %s", err, err, expectedType))
}
func cmpErrorTypeImplementsType(err error, expectedType reflect.Type) Result {
if err == nil {
return ResultFailure(fmt.Sprintf("error is nil, not %s", expectedType))
}
errValue := reflect.ValueOf(err)
if errValue.Type().Implements(expectedType) {
return ResultSuccess
}
return ResultFailure(fmt.Sprintf("error is %s (%T), not %s", err, err, expectedType))
}
func isPtrToInterface(typ reflect.Type) bool {
return typ.Kind() == reflect.Ptr && typ.Elem().Kind() == reflect.Interface
}

94
vendor/github.com/gotestyourself/gotestyourself/assert/cmp/result.go generated vendored Normal file
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package cmp
import (
"bytes"
"fmt"
"go/ast"
"text/template"
"github.com/gotestyourself/gotestyourself/internal/source"
)
// Result of a Comparison.
type Result interface {
Success() bool
}
type result struct {
success bool
message string
}
func (r result) Success() bool {
return r.success
}
func (r result) FailureMessage() string {
return r.message
}
// ResultSuccess is a constant which is returned by a ComparisonWithResult to
// indicate success.
var ResultSuccess = result{success: true}
// ResultFailure returns a failed Result with a failure message.
func ResultFailure(message string) Result {
return result{message: message}
}
// ResultFromError returns ResultSuccess if err is nil. Otherwise ResultFailure
// is returned with the error message as the failure message.
func ResultFromError(err error) Result {
if err == nil {
return ResultSuccess
}
return ResultFailure(err.Error())
}
type templatedResult struct {
success bool
template string
data map[string]interface{}
}
func (r templatedResult) Success() bool {
return r.success
}
func (r templatedResult) FailureMessage(args []ast.Expr) string {
msg, err := renderMessage(r, args)
if err != nil {
return fmt.Sprintf("failed to render failure message: %s", err)
}
return msg
}
// ResultFailureTemplate returns a Result with a template string and data which
// can be used to format a failure message. The template may access data from .Data,
// the comparison args with the callArg function, and the formatNode function may
// be used to format the call args.
func ResultFailureTemplate(template string, data map[string]interface{}) Result {
return templatedResult{template: template, data: data}
}
func renderMessage(result templatedResult, args []ast.Expr) (string, error) {
tmpl := template.New("failure").Funcs(template.FuncMap{
"formatNode": source.FormatNode,
"callArg": func(index int) ast.Expr {
if index >= len(args) {
return nil
}
return args[index]
},
})
var err error
tmpl, err = tmpl.Parse(result.template)
if err != nil {
return "", err
}
buf := new(bytes.Buffer)
err = tmpl.Execute(buf, map[string]interface{}{
"Data": result.data,
})
return buf.String(), err
}

107
vendor/github.com/gotestyourself/gotestyourself/assert/result.go generated vendored Normal file
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package assert
import (
"fmt"
"go/ast"
"github.com/gotestyourself/gotestyourself/assert/cmp"
"github.com/gotestyourself/gotestyourself/internal/format"
"github.com/gotestyourself/gotestyourself/internal/source"
)
func runComparison(
t TestingT,
argSelector argSelector,
f cmp.Comparison,
msgAndArgs ...interface{},
) bool {
if ht, ok := t.(helperT); ok {
ht.Helper()
}
result := f()
if result.Success() {
return true
}
var message string
switch typed := result.(type) {
case resultWithComparisonArgs:
const stackIndex = 3 // Assert/Check, assert, runComparison
args, err := source.CallExprArgs(stackIndex)
if err != nil {
t.Log(err.Error())
}
message = typed.FailureMessage(filterPrintableExpr(argSelector(args)))
case resultBasic:
message = typed.FailureMessage()
default:
message = fmt.Sprintf("comparison returned invalid Result type: %T", result)
}
t.Log(format.WithCustomMessage(failureMessage+message, msgAndArgs...))
return false
}
type resultWithComparisonArgs interface {
FailureMessage(args []ast.Expr) string
}
type resultBasic interface {
FailureMessage() string
}
// filterPrintableExpr filters the ast.Expr slice to only include Expr that are
// easy to read when printed and contain relevant information to an assertion.
//
// Ident and SelectorExpr are included because they print nicely and the variable
// names may provide additional context to their values.
// BasicLit and CompositeLit are excluded because their source is equivalent to
// their value, which is already available.
// Other types are ignored for now, but could be added if they are relevant.
func filterPrintableExpr(args []ast.Expr) []ast.Expr {
result := make([]ast.Expr, len(args))
for i, arg := range args {
if isShortPrintableExpr(arg) {
result[i] = arg
continue
}
if starExpr, ok := arg.(*ast.StarExpr); ok {
result[i] = starExpr.X
continue
}
result[i] = nil
}
return result
}
func isShortPrintableExpr(expr ast.Expr) bool {
switch expr.(type) {
case *ast.Ident, *ast.SelectorExpr, *ast.IndexExpr, *ast.SliceExpr:
return true
case *ast.BinaryExpr, *ast.UnaryExpr:
return true
default:
// CallExpr, ParenExpr, TypeAssertExpr, KeyValueExpr, StarExpr
return false
}
}
type argSelector func([]ast.Expr) []ast.Expr
func argsAfterT(args []ast.Expr) []ast.Expr {
if len(args) < 1 {
return nil
}
return args[1:]
}
func argsFromComparisonCall(args []ast.Expr) []ast.Expr {
if len(args) < 1 {
return nil
}
if callExpr, ok := args[1].(*ast.CallExpr); ok {
return callExpr.Args
}
return nil
}

27
vendor/github.com/gotestyourself/gotestyourself/internal/format/format.go generated vendored Normal file
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@ -0,0 +1,27 @@
package format
import "fmt"
// Message accepts a msgAndArgs varargs and formats it using fmt.Sprintf
func Message(msgAndArgs ...interface{}) string {
switch len(msgAndArgs) {
case 0:
return ""
case 1:
return fmt.Sprintf("%v", msgAndArgs[0])
default:
return fmt.Sprintf(msgAndArgs[0].(string), msgAndArgs[1:]...)
}
}
// WithCustomMessage accepts one or two messages and formats them appropriately
func WithCustomMessage(source string, msgAndArgs ...interface{}) string {
custom := Message(msgAndArgs...)
switch {
case custom == "":
return source
case source == "":
return custom
}
return fmt.Sprintf("%s: %s", source, custom)
}

163
vendor/github.com/gotestyourself/gotestyourself/internal/source/source.go generated vendored Normal file
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@ -0,0 +1,163 @@
package source
import (
"bytes"
"fmt"
"go/ast"
"go/format"
"go/parser"
"go/token"
"os"
"runtime"
"strconv"
"strings"
"github.com/pkg/errors"
)
const baseStackIndex = 1
// FormattedCallExprArg returns the argument from an ast.CallExpr at the
// index in the call stack. The argument is formatted using FormatNode.
func FormattedCallExprArg(stackIndex int, argPos int) (string, error) {
args, err := CallExprArgs(stackIndex + 1)
if err != nil {
return "", err
}
return FormatNode(args[argPos])
}
func getNodeAtLine(filename string, lineNum int) (ast.Node, error) {
fileset := token.NewFileSet()
astFile, err := parser.ParseFile(fileset, filename, nil, parser.AllErrors)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse source file: %s", filename)
}
node := scanToLine(fileset, astFile, lineNum)
if node == nil {
return nil, errors.Errorf(
"failed to find an expression on line %d in %s", lineNum, filename)
}
return node, nil
}
func scanToLine(fileset *token.FileSet, node ast.Node, lineNum int) ast.Node {
v := &scanToLineVisitor{lineNum: lineNum, fileset: fileset}
ast.Walk(v, node)
return v.matchedNode
}
type scanToLineVisitor struct {
lineNum int
matchedNode ast.Node
fileset *token.FileSet
}
func (v *scanToLineVisitor) Visit(node ast.Node) ast.Visitor {
if node == nil || v.matchedNode != nil {
return nil
}
if v.nodePosition(node).Line == v.lineNum {
v.matchedNode = node
return nil
}
return v
}
// In golang 1.9 the line number changed from being the line where the statement
// ended to the line where the statement began.
func (v *scanToLineVisitor) nodePosition(node ast.Node) token.Position {
if goVersionBefore19 {
return v.fileset.Position(node.End())
}
return v.fileset.Position(node.Pos())
}
var goVersionBefore19 = isGOVersionBefore19()
func isGOVersionBefore19() bool {
version := runtime.Version()
// not a release version
if !strings.HasPrefix(version, "go") {
return false
}
version = strings.TrimPrefix(version, "go")
parts := strings.Split(version, ".")
if len(parts) < 2 {
return false
}
minor, err := strconv.ParseInt(parts[1], 10, 32)
return err == nil && parts[0] == "1" && minor < 9
}
func getCallExprArgs(node ast.Node) ([]ast.Expr, error) {
visitor := &callExprVisitor{}
ast.Walk(visitor, node)
if visitor.expr == nil {
return nil, errors.New("failed to find call expression")
}
return visitor.expr.Args, nil
}
type callExprVisitor struct {
expr *ast.CallExpr
}
func (v *callExprVisitor) Visit(node ast.Node) ast.Visitor {
if v.expr != nil || node == nil {
return nil
}
debug("visit (%T): %s", node, debugFormatNode{node})
if callExpr, ok := node.(*ast.CallExpr); ok {
v.expr = callExpr
return nil
}
return v
}
// FormatNode using go/format.Node and return the result as a string
func FormatNode(node ast.Node) (string, error) {
buf := new(bytes.Buffer)
err := format.Node(buf, token.NewFileSet(), node)
return buf.String(), err
}
// CallExprArgs returns the ast.Expr slice for the args of an ast.CallExpr at
// the index in the call stack.
func CallExprArgs(stackIndex int) ([]ast.Expr, error) {
_, filename, lineNum, ok := runtime.Caller(baseStackIndex + stackIndex)
if !ok {
return nil, errors.New("failed to get call stack")
}
debug("call stack position: %s:%d", filename, lineNum)
node, err := getNodeAtLine(filename, lineNum)
if err != nil {
return nil, err
}
debug("found node (%T): %s", node, debugFormatNode{node})
return getCallExprArgs(node)
}
var debugEnabled = os.Getenv("GOTESTYOURSELF_DEBUG") != ""
func debug(format string, args ...interface{}) {
if debugEnabled {
fmt.Fprintf(os.Stderr, "DEBUG: "+format+"\n", args...)
}
}
type debugFormatNode struct {
ast.Node
}
func (n debugFormatNode) String() string {
out, err := FormatNode(n.Node)
if err != nil {
return fmt.Sprintf("failed to format %s: %s", n.Node, err)
}
return out
}