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87 lines
2.2 KiB
87 lines
2.2 KiB
4 years ago
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var path = require('path')
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var fs = require('fs')
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var Writer = require('./writer.js')
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var _ = require('lodash')
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/**
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* Class the can generate variations and indexes for the comment-patterns database.
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* @constructor
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*/
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function Generator () {
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// Read the whole database into a single array
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var languagesPath = path.resolve(__dirname, '..', 'languages', 'patterns')
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var langFiles = fs.readdirSync(languagesPath)
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/**
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* This is the database of language specifications
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* @type {Array}
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*/
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var languages = langFiles
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.filter(function (langFile) {
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return path.extname(langFile) === '.js'
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})
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.map(function (langFile) {
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return _.merge(
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{
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srcFile: langFile
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},
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require(path.resolve(languagesPath, langFile))
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)
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})
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// Unique representation for single-line comment patterns
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// '#' -> { start: '#' }
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.map(function (langFile) {
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if (langFile.singleLineComment) {
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langFile.singleLineComment = langFile.singleLineComment.map(function (slc) {
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if (_.isString(slc)) {
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return { start: slc }
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} else {
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return slc
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}
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})
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}
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return langFile
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})
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/**
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* Create an index for fast access to the database
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* @param {function} `fn` a function to compute the key for each specification.
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* If the result is an array, the entry will be indexed by every element of the result
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*/
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this.createIndex = function (fn) {
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var result = {}
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languages.forEach(function (langSpec, i) {
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var keys = fn.call(this, langSpec)
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if (_.isArray(keys)) {
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keys.forEach(function (key) {
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result[key] = i
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})
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} else {
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// keys only consists of a single key
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result[keys] = i
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}
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})
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return new Writer(result)
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}
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/**
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* Transform each element of
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* @param fn
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*/
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this.transform = function (fn) {
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return new Writer(languages.map(fn))
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}
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/**
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* Write the un-transformerd library to a file
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* @param {string} `targetDir` the directory of the file
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* @param {string} `filename` the name of the file
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*/
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this.writeTo = function (targetDir, filename) {
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this.transform(_.identity).writeTo(targetDir, filename)
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}
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}
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module.exports = Generator
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