127 lines
2.9 KiB
JavaScript
127 lines
2.9 KiB
JavaScript
'use strict'
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const ParserEND = 0x110000
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class ParserError extends Error {
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/* istanbul ignore next */
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constructor (msg, filename, linenumber) {
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super('[ParserError] ' + msg, filename, linenumber)
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this.name = 'ParserError'
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this.code = 'ParserError'
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if (Error.captureStackTrace) Error.captureStackTrace(this, ParserError)
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}
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}
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class State {
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constructor (parser) {
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this.parser = parser
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this.buf = ''
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this.returned = null
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this.result = null
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this.resultTable = null
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this.resultArr = null
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}
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}
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class Parser {
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constructor () {
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this.pos = 0
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this.col = 0
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this.line = 0
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this.obj = {}
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this.ctx = this.obj
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this.stack = []
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this._buf = ''
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this.char = null
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this.ii = 0
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this.state = new State(this.parseStart)
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}
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parse (str) {
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/* istanbul ignore next */
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if (str.length === 0 || str.length == null) return
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this._buf = String(str)
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this.ii = -1
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this.char = -1
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let getNext
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while (getNext === false || this.nextChar()) {
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getNext = this.runOne()
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}
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this._buf = null
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}
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nextChar () {
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if (this.char === 0x0A) {
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++this.line
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this.col = -1
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}
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++this.ii
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this.char = this._buf.codePointAt(this.ii)
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++this.pos
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++this.col
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return this.haveBuffer()
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}
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haveBuffer () {
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return this.ii < this._buf.length
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}
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runOne () {
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return this.state.parser.call(this, this.state.returned)
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}
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finish () {
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this.char = ParserEND
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let last
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do {
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last = this.state.parser
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this.runOne()
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} while (this.state.parser !== last)
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this.ctx = null
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this.state = null
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this._buf = null
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return this.obj
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}
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next (fn) {
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/* istanbul ignore next */
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if (typeof fn !== 'function') throw new ParserError('Tried to set state to non-existent state: ' + JSON.stringify(fn))
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this.state.parser = fn
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}
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goto (fn) {
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this.next(fn)
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return this.runOne()
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}
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call (fn, returnWith) {
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if (returnWith) this.next(returnWith)
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this.stack.push(this.state)
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this.state = new State(fn)
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}
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callNow (fn, returnWith) {
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this.call(fn, returnWith)
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return this.runOne()
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}
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return (value) {
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/* istanbul ignore next */
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if (this.stack.length === 0) throw this.error(new ParserError('Stack underflow'))
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if (value === undefined) value = this.state.buf
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this.state = this.stack.pop()
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this.state.returned = value
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}
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returnNow (value) {
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this.return(value)
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return this.runOne()
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}
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consume () {
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/* istanbul ignore next */
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if (this.char === ParserEND) throw this.error(new ParserError('Unexpected end-of-buffer'))
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this.state.buf += this._buf[this.ii]
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}
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error (err) {
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err.line = this.line
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err.col = this.col
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err.pos = this.pos
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return err
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}
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/* istanbul ignore next */
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parseStart () {
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throw new ParserError('Must declare a parseStart method')
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}
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}
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Parser.END = ParserEND
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Parser.Error = ParserError
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module.exports = Parser
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