360 lines
12 KiB
JavaScript
360 lines
12 KiB
JavaScript
#!/usr/bin/env node
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const fs = require("fs");
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const path = require("path");
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const remark = require("remark");
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const languages = require("./languages");
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const commandLineArgs = require("command-line-args");
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const optionDefinitions = [
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{
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name: "input",
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multiple: true,
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defaultValue: ["./fpb/books", "./fpb/casts", "./fpb/courses", "./fpb/more"],
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},
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{ name: "output", defaultValue: "./parser/fpb.json" },
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];
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const excludes = [
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"README.md",
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"CONTRIBUTING.md",
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"CODE_OF_CONDUCT.md",
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"SUMMARY.md",
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];
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/**
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* Parses a list item generated from remark-parse into a readable format.
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*
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* remark-parse parses a markdown file into a long, intricate json.
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* Many fields in this json either give information we do not care
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* about or does not go into enough detail. This function parses the
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* output of remark-parse into a format preferred by this project,
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* indicating authors, notes, and links etc.
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*
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* @param {Object} listItem - a listItem in AST format defined by remark-parse
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*
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* @return {Object} Returns an Object containing details about the piece of media.
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*/
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function parseListItem(listItem) {
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let stripParens = function (s) {
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if (s.slice(0, 1) === "(" && s.slice(-1) === ")") return s.slice(1, -1);
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return s;
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};
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let entry = {};
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let s = ""; // If we need to build up a string over multiple listItem elements
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let leftParen,
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rightParen = -1; // If we need to parse parenthesized text
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const [link, ...otherStuff] = listItem; // head of listItem = url, the rest is "other stuff"
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entry.url = link.url;
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entry.title = link.children[0].value;
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// remember to get OTHER STUFF!! remember there may be multiple links!
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for (let i of otherStuff) {
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if (s === "") {
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// this is almost always, except for when we are parsing a multi-element note
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if (i.type === "text" && i.value.slice(0, 3) === " - ") {
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// author found
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let parenIndex = i.value.indexOf("(");
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if (parenIndex === -1) {
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entry.author = i.value.slice(3).trim();
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} else {
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entry.author = i.value.slice(3, parenIndex).trim(); // go from " - " until the first "("
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}
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}
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if (
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i.type === "emphasis" &&
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i.children[0].value.slice(0, 1) === "(" &&
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i.children[0].value.slice(-1) === ")"
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) {
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// access notes found (currently assumes exactly one child, so far this is always the case)
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entry.accessNotes = i.children[0].value.slice(1, -1);
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}
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if (i.type === "link") {
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// other links found
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if (entry.otherLinks === undefined) entry.otherLinks = [];
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entry.otherLinks.push({
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title: stripParens(i.children[0].value),
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url: i.url,
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});
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// entry.otherLinks = [...entry.otherLinks, {title: i.children[0].value, url: i.url}]; // <-- i wish i could get this syntax to work with arrays
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}
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if (i.type === "text" && i.value.indexOf("(") !== -1) {
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// notes found (currently assumes no nested parentheses)
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if (entry.notes === undefined) entry.notes = [];
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leftParen = i.value.indexOf("(");
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while (leftParen != -1) {
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rightParen = i.value.indexOf(")", leftParen);
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if (rightParen === -1) {
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// there must be some *emphasis* found
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s += i.value.slice(leftParen);
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break;
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}
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entry.notes.push(i.value.slice(leftParen + 1, rightParen));
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leftParen = i.value.indexOf("(", rightParen);
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}
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}
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} else {
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// for now we assume that all previous ifs are mutually exclusive with this, may polish later
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if (i.type === "emphasis") {
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// this is the emphasis, add it in boldface and move on
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s += "*" + i.children[0].value + "*";
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} else if (i.type === "link") {
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// something has gone terribly wrong. this book must be viewed and edited manually.
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entry.manualReviewRequired = true;
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break;
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} else {
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// hopefully this is the end of the note
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let rightParen = i.value.indexOf(")");
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if (rightParen === -1) {
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// we have to go AGAIN
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s += i.value;
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} else {
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// finally, we have reached the end of the note
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entry.notes.push(stripParens(s + i.value.slice(0, rightParen + 1)));
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s = "";
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// this is a copypaste of another block of code. probably not a good thing tbh.
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leftParen = i.value.indexOf("(");
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while (leftParen != -1) {
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rightParen = i.value.indexOf(")", leftParen);
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if (rightParen === -1) {
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// there must be some *emphasis* found
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s += i.value.slice(leftParen);
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break;
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}
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entry.notes.push(i.value.slice(leftParen + 1, rightParen));
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leftParen = i.value.indexOf("(", rightParen);
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}
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}
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}
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}
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}
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return entry;
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}
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/**
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* Determines the language a certain file is based on the format
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* from the FreeEbookFoundation GitHub page
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* @param {String} filename A filename in the format kept by all markdown files on the FreeProgrammingBooks Github
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* @returns {String} The language the file is
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*/
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function getLangFromFilename(filename) {
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const dash = filename.lastIndexOf("-");
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const dot = filename.lastIndexOf(".");
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let lang = filename.slice(dash + 1, dot).replace(/_/, "-");
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let isSubject = false;
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if (!languages.hasOwnProperty(lang)) {
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if (/^[a-z]{2}$/.test(lang) || /^[a-z]{2}-[A-Z]{2}$/.test(lang)) {
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return "";
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}
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// console.log(lang);
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if (lang === "subjects") {
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isSubject = true;
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}
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lang = "en";
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}
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return { lang: lang, isSubject: isSubject };
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}
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/**
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* Gets all markdown files in a directory,
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* @param {String} dir - A directory path
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* @returns A list of all md files in a directory, excluding those in the excludes array
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*/
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function getFilesFromDir(dir) {
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return fs
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.readdirSync(dir)
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.filter(
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(file) => path.extname(file) === ".md" && excludes.indexOf(file) === -1
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)
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.map((file) => path.join(dir, file));
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}
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/**
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* Retrieves the folder name from a string representing a directory and file
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* @param {String} str - A string representing a path directory alike in the format "./directory/file"
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* @returns {String} The extracted directory name
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*/
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function getMediaTypeFromDirectoryPath(str) {
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const slash = str.lastIndexOf("/");
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let mediaType = str.slice(2, slash);
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return mediaType;
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}
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/**
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* Turns a single markdown file into the json structure needed
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* @param {path} doc - a single file path to a markdown file
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* @returns {object} Json object of entries in the md file
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*/
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function parseMarkdown(doc) {
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let tree = remark.parse(doc).children;
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let sections = []; // This will go into root object later
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let errors = [];
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let currentDepth = 3; // used to determine if the last heading was an h4 or h3
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// find where Index ends
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// probably could be done better, review later
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let i = 0,
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count = 0;
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for (i; i < tree.length; i++) {
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if (tree[i].type == "heading" && tree[i].depth == "3") count++;
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if (count == 2) break;
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}
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tree.slice(i).forEach((item) => {
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// Start iterating after Index
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try {
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if (item.type == "heading" && item.children[0].value == "Index") return;
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if (item.type == "heading") {
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if (item.depth == 3) {
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// Heading is an h3
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currentDepth = 3;
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let newSection = {
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section: item.children[0].value, // Get the name of the section
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entries: [],
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subsections: [],
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};
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sections.push(newSection); // Push the section to the output array
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} else if (item.depth == 4) {
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// Heading is an h4
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currentDepth = 4;
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let newSubsection = {
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section: item.children[0].value, // Get the name of the subsection
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entries: [],
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};
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sections[sections.length - 1].subsections.push(newSubsection); // Add to subsection array of most recent h3
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}
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} else if (item.type == "list") {
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item.children.forEach((listItem) => {
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let content = listItem.children[0].children; // gets array containing a remark-link and a remark-paragraph
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// if(content[0].type !== 'link'){ // SKIPS OVER bad formatting
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// return;
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// }
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if (currentDepth == 3) {
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let contentJson = parseListItem(content);
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sections[sections.length - 1].entries.push(contentJson); // add the entry to most recent h3
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} else if (currentDepth == 4) {
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let lastSection = sections.length - 1;
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let lastSubSec = sections[lastSection].subsections.length - 1;
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let contentJson = parseListItem(content);
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sections[lastSection].subsections[lastSubSec].entries.push(
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contentJson
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); // add entry to most recent h4
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}
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});
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}
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} catch (e) {
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// if there was an error while parsing, print the error to an error log
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// looks really ugly, maybe try to refine output later
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let errStart = JSON.stringify(item.position.start.line);
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let errEnd = JSON.stringify(item.position.end.line);
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str = `Error at line ${errStart} - line ${errEnd}.`;
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errors.push(str);
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}
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});
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return { sections: sections, errors: errors };
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}
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/**
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* Parses a single directory's md files and converts them into usable json
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* @param {String} directory A string pointing to a directory
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* @returns {Object} An object containing two values, dirJson and dirErrors.
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* dirJson contains all data that was successfully parsed from
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* the markdown files. dirErrors contains all entries that had
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* an error occur while parsing.
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*/
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function parseDirectory(directory) {
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let dirChildren = []; // this will hold the output each markdown doc
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let dirErrors = []; //contains error for a given directory
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let mediaType = getMediaTypeFromDirectoryPath(directory);
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const filenames = getFilesFromDir(path.resolve(directory));
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filenames.forEach((filename) => {
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const doc = fs.readFileSync(filename);
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let { sections, errors } = parseMarkdown(doc); // parse the markdown document
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const { lang, isSubject } = getLangFromFilename(filename);
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// Entries
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let docJson = {
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language: {
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code: lang,
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name: languages[lang],
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},
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index: {},
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sections: sections,
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};
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if (lang === "en") docJson.language.isSubject = isSubject;
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dirChildren.push(docJson);
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// Errors
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if (errors.length !== 0) {
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let docErrors = {
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file: path.basename(filename),
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errors: errors,
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};
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dirErrors.push(docErrors);
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}
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});
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// File entries
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let dirJson = {
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type: mediaType,
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index: {},
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children: dirChildren,
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};
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// Errors
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return { dirJson: dirJson, dirErrors: dirErrors };
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}
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/**
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* Reads all given directories for markdown files and prints the parsed json in the output directory
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*
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* @param {Array} directories A list of strings of directories to scan for markdown files
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* @param {String} output A string for the path that the output should be placed in
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*/
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function parseAll(directories, output) {
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let rootChildren = []; // this will hold the output of each directory
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let rootErrors = [];
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directories.forEach((directory) => {
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let { dirJson, dirErrors } = parseDirectory(directory);
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rootChildren.push(dirJson);
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if (dirErrors.length !== 0) {
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rootErrors.push({
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directory: path.basename(directory),
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files: dirErrors,
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});
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}
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});
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// ALl entries
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let rootJson = {
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type: "root",
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children: rootChildren,
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};
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// Errors
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let allErrors = {
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type: "root",
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directories: rootErrors,
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};
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fs.writeFileSync(output, JSON.stringify(rootJson, null, 3), function (err) {
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if (err) {
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console.log(err);
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}
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});
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// fs.writeFileSync(
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// "./parser/fpb.log",
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// JSON.stringify(allErrors, null, 3),
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// function (err) {
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// if (err) {
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// console.log(err);
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// }
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// }
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// );
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}
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let { input, output } = commandLineArgs(optionDefinitions);
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parseAll(input, output);
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