mirror of
https://github.com/github/codeql-action.git
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370 lines
8.7 KiB
JavaScript
370 lines
8.7 KiB
JavaScript
'use strict'
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const stream = require('stream')
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const utils = require('./utils')
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const Decoder = require('./decoder')
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const NoFilter = require('nofilter')
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const {MT, NUMBYTES, SYMS} = require('./constants')
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const {Buffer} = require('buffer')
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function plural(c) {
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if (c > 1) {
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return 's'
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}
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return ''
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}
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/**
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* @typedef CommentOptions
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* @property {number} [max_depth=10] How many times to indent
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* the dashes.
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* @property {number} [depth=1] Initial indentation depth.
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* @property {boolean} [no_summary=false] If true, omit the summary
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* of the full bytes read at the end.
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* @property {object} [tags] Mapping from tag number to function(v),
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* where v is the decoded value that comes after the tag, and where the
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* function returns the correctly-created value for that tag.
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* @property {boolean} [preferWeb=false] If true, prefer Uint8Arrays to
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* be generated instead of node Buffers. This might turn on some more
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* changes in the future, so forward-compatibility is not guaranteed yet.
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* @property {BufferEncoding} [encoding='hex'] Encoding to use for input, if it
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* is a string.
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*/
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/**
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* @callback commentCallback
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* @param {Error} [error] If one was generated.
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* @param {string} [commented] The comment string.
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* @returns {void}
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*/
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/**
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* Normalize inputs to the static functions.
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*
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* @param {CommentOptions|commentCallback|string|number} opts Encoding,
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* max_depth, or callback.
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* @param {commentCallback} [cb] Called on completion.
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* @returns {{options: CommentOptions, cb: commentCallback}} Normalized value.
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* @throws {TypeError} Unknown option type.
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* @private
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*/
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function normalizeOptions(opts, cb) {
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switch (typeof opts) {
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case 'function':
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return {options: {}, cb: /** @type {commentCallback} */ (opts)}
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case 'string':
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return {options: {encoding: /** @type {BufferEncoding} */ (opts)}, cb}
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case 'number':
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return {options: {max_depth: opts}, cb}
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case 'object':
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return {options: opts || {}, cb}
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default:
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throw new TypeError('Unknown option type')
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}
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}
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/**
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* Generate the expanded format of RFC 8949, section 3.2.2.
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*
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* @extends stream.Transform
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*/
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class Commented extends stream.Transform {
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/**
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* Create a CBOR commenter.
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*
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* @param {CommentOptions} [options={}] Stream options.
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*/
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constructor(options = {}) {
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const {
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depth = 1,
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max_depth = 10,
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no_summary = false,
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// Decoder options
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tags = {},
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preferWeb,
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encoding,
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// Stream.Transform options
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...superOpts
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} = options
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super({
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...superOpts,
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readableObjectMode: false,
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writableObjectMode: false,
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})
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this.depth = depth
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this.max_depth = max_depth
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this.all = new NoFilter()
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if (!tags[24]) {
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tags[24] = this._tag_24.bind(this)
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}
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this.parser = new Decoder({
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tags,
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max_depth,
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preferWeb,
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encoding,
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})
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this.parser.on('value', this._on_value.bind(this))
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this.parser.on('start', this._on_start.bind(this))
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this.parser.on('start-string', this._on_start_string.bind(this))
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this.parser.on('stop', this._on_stop.bind(this))
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this.parser.on('more-bytes', this._on_more.bind(this))
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this.parser.on('error', this._on_error.bind(this))
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if (!no_summary) {
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this.parser.on('data', this._on_data.bind(this))
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}
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this.parser.bs.on('read', this._on_read.bind(this))
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}
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/**
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* @param {Buffer} v Descend into embedded CBOR.
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* @private
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*/
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_tag_24(v) {
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const c = new Commented({depth: this.depth + 1, no_summary: true})
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c.on('data', b => this.push(b))
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c.on('error', er => this.emit('error', er))
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c.end(v)
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}
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_transform(fresh, encoding, cb) {
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this.parser.write(fresh, encoding, cb)
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}
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_flush(cb) {
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// TODO: find the test that covers this, and look at the return value
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return this.parser._flush(cb)
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}
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/**
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* Comment on an input Buffer or string, creating a string passed to the
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* callback. If callback not specified, a promise is returned.
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*
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* @static
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* @param {string|Buffer|ArrayBuffer|Uint8Array|Uint8ClampedArray
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* |DataView|stream.Readable} input Something to parse.
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* @param {CommentOptions|commentCallback|string|number} [options={}]
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* Encoding, max_depth, or callback.
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* @param {commentCallback} [cb] If specified, called on completion.
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* @returns {Promise} If cb not specified.
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* @throws {Error} Input required.
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*/
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static comment(input, options = {}, cb = null) {
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if (input == null) {
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throw new Error('input required')
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}
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({options, cb} = normalizeOptions(options, cb))
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const bs = new NoFilter()
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const {encoding = 'hex', ...opts} = options
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const d = new Commented(opts)
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let p = null
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if (typeof cb === 'function') {
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d.on('end', () => {
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cb(null, bs.toString('utf8'))
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})
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d.on('error', cb)
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} else {
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p = new Promise((resolve, reject) => {
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d.on('end', () => {
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resolve(bs.toString('utf8'))
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})
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d.on('error', reject)
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})
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}
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d.pipe(bs)
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utils.guessEncoding(input, encoding).pipe(d)
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return p
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}
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/**
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* @ignore
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*/
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_on_error(er) {
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this.push('ERROR: ')
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this.push(er.toString())
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this.push('\n')
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}
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/**
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* @ignore
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*/
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_on_read(buf) {
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this.all.write(buf)
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const hex = buf.toString('hex')
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this.push(new Array(this.depth + 1).join(' '))
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this.push(hex)
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let ind = ((this.max_depth - this.depth) * 2) - hex.length
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if (ind < 1) {
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ind = 1
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}
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this.push(new Array(ind + 1).join(' '))
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this.push('-- ')
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}
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/**
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* @ignore
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*/
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_on_more(mt, len, parent_mt, pos) {
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let desc = ''
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this.depth++
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switch (mt) {
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case MT.POS_INT:
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desc = 'Positive number,'
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break
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case MT.NEG_INT:
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desc = 'Negative number,'
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break
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case MT.ARRAY:
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desc = 'Array, length'
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break
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case MT.MAP:
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desc = 'Map, count'
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break
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case MT.BYTE_STRING:
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desc = 'Bytes, length'
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break
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case MT.UTF8_STRING:
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desc = 'String, length'
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break
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case MT.SIMPLE_FLOAT:
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if (len === 1) {
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desc = 'Simple value,'
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} else {
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desc = 'Float,'
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}
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break
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}
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this.push(`${desc} next ${len} byte${plural(len)}\n`)
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}
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/**
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* @ignore
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*/
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_on_start_string(mt, len, parent_mt, pos) {
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let desc = ''
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this.depth++
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switch (mt) {
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case MT.BYTE_STRING:
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desc = `Bytes, length: ${len}`
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break
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case MT.UTF8_STRING:
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desc = `String, length: ${len.toString()}`
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break
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}
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this.push(`${desc}\n`)
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}
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/**
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* @ignore
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*/
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_on_start(mt, tag, parent_mt, pos) {
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this.depth++
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switch (parent_mt) {
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case MT.ARRAY:
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this.push(`[${pos}], `)
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break
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case MT.MAP:
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if (pos % 2) {
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this.push(`{Val:${Math.floor(pos / 2)}}, `)
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} else {
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this.push(`{Key:${Math.floor(pos / 2)}}, `)
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}
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break
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}
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switch (mt) {
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case MT.TAG:
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this.push(`Tag #${tag}`)
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if (tag === 24) {
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this.push(' Encoded CBOR data item')
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}
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break
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case MT.ARRAY:
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if (tag === SYMS.STREAM) {
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this.push('Array (streaming)')
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} else {
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this.push(`Array, ${tag} item${plural(tag)}`)
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}
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break
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case MT.MAP:
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if (tag === SYMS.STREAM) {
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this.push('Map (streaming)')
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} else {
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this.push(`Map, ${tag} pair${plural(tag)}`)
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}
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break
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case MT.BYTE_STRING:
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this.push('Bytes (streaming)')
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break
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case MT.UTF8_STRING:
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this.push('String (streaming)')
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break
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}
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this.push('\n')
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}
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/**
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* @ignore
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*/
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_on_stop(mt) {
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this.depth--
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}
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/**
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* @private
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*/
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_on_value(val, parent_mt, pos, ai) {
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if (val !== SYMS.BREAK) {
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switch (parent_mt) {
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case MT.ARRAY:
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this.push(`[${pos}], `)
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break
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case MT.MAP:
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if (pos % 2) {
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this.push(`{Val:${Math.floor(pos / 2)}}, `)
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} else {
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this.push(`{Key:${Math.floor(pos / 2)}}, `)
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}
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break
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}
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}
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const str = utils.cborValueToString(val, -Infinity)
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if ((typeof val === 'string') ||
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(Buffer.isBuffer(val))) {
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if (val.length > 0) {
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this.push(str)
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this.push('\n')
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}
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this.depth--
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} else {
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this.push(str)
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this.push('\n')
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}
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switch (ai) {
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case NUMBYTES.ONE:
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case NUMBYTES.TWO:
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case NUMBYTES.FOUR:
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case NUMBYTES.EIGHT:
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this.depth--
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}
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}
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/**
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* @ignore
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*/
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_on_data() {
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this.push('0x')
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this.push(this.all.read().toString('hex'))
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this.push('\n')
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}
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}
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module.exports = Commented
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