forked from kevin.shehu/GGD
973 lines
30 KiB
JavaScript
973 lines
30 KiB
JavaScript
;(function(root, factory) {
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// istanbul ignore next
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if (typeof define === "function" && define.amd) {
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// istanbul ignore next
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define([], factory)
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} else if (typeof module === "object" && module.exports) {
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module.exports = factory()
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} else {
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// istanbul ignore next
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root.regexpToAst = factory()
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}
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})(
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typeof self !== "undefined"
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? // istanbul ignore next
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self
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: this,
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function() {
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// references
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// https://hackernoon.com/the-madness-of-parsing-real-world-javascript-regexps-d9ee336df983
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// https://www.ecma-international.org/ecma-262/8.0/index.html#prod-Pattern
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function RegExpParser() {}
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RegExpParser.prototype.saveState = function() {
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return {
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idx: this.idx,
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input: this.input,
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groupIdx: this.groupIdx
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}
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}
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RegExpParser.prototype.restoreState = function(newState) {
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this.idx = newState.idx
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this.input = newState.input
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this.groupIdx = newState.groupIdx
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}
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RegExpParser.prototype.pattern = function(input) {
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// parser state
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this.idx = 0
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this.input = input
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this.groupIdx = 0
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this.consumeChar("/")
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var value = this.disjunction()
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this.consumeChar("/")
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var flags = {
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type: "Flags",
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global: false,
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ignoreCase: false,
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multiLine: false,
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unicode: false,
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sticky: false
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}
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while (this.isRegExpFlag()) {
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switch (this.popChar()) {
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case "g":
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addFlag(flags, "global")
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break
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case "i":
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addFlag(flags, "ignoreCase")
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break
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case "m":
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addFlag(flags, "multiLine")
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break
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case "u":
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addFlag(flags, "unicode")
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break
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case "y":
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addFlag(flags, "sticky")
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break
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}
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}
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if (this.idx !== this.input.length) {
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throw Error(
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"Redundant input: " + this.input.substring(this.idx)
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)
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}
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return { type: "Pattern", flags: flags, value: value }
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}
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RegExpParser.prototype.disjunction = function() {
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var alts = []
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alts.push(this.alternative())
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while (this.peekChar() === "|") {
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this.consumeChar("|")
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alts.push(this.alternative())
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}
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return { type: "Disjunction", value: alts }
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}
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RegExpParser.prototype.alternative = function() {
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var terms = []
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while (this.isTerm()) {
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terms.push(this.term())
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}
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return { type: "Alternative", value: terms }
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}
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RegExpParser.prototype.term = function() {
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if (this.isAssertion()) {
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return this.assertion()
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} else {
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return this.atom()
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}
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}
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RegExpParser.prototype.assertion = function() {
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switch (this.popChar()) {
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case "^":
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return { type: "StartAnchor" }
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case "$":
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return { type: "EndAnchor" }
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// '\b' or '\B'
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case "\\":
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switch (this.popChar()) {
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case "b":
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return { type: "WordBoundary" }
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case "B":
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return { type: "NonWordBoundary" }
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}
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// istanbul ignore next
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throw Error("Invalid Assertion Escape")
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// '(?=' or '(?!'
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case "(":
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this.consumeChar("?")
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var type
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switch (this.popChar()) {
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case "=":
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type = "Lookahead"
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break
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case "!":
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type = "NegativeLookahead"
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break
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}
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ASSERT_EXISTS(type)
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var disjunction = this.disjunction()
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this.consumeChar(")")
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return { type: type, value: disjunction }
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}
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// istanbul ignore next
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ASSERT_NEVER_REACH_HERE()
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}
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RegExpParser.prototype.quantifier = function(isBacktracking) {
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var range
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switch (this.popChar()) {
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case "*":
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range = {
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atLeast: 0,
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atMost: Infinity
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}
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break
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case "+":
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range = {
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atLeast: 1,
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atMost: Infinity
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}
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break
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case "?":
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range = {
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atLeast: 0,
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atMost: 1
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}
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break
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case "{":
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var atLeast = this.integerIncludingZero()
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switch (this.popChar()) {
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case "}":
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range = {
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atLeast: atLeast,
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atMost: atLeast
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}
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break
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case ",":
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var atMost
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if (this.isDigit()) {
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atMost = this.integerIncludingZero()
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range = {
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atLeast: atLeast,
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atMost: atMost
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}
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} else {
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range = {
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atLeast: atLeast,
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atMost: Infinity
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}
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}
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this.consumeChar("}")
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break
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}
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// throwing exceptions from "ASSERT_EXISTS" during backtracking
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// causes severe performance degradations
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if (isBacktracking === true && range === undefined) {
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return undefined
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}
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ASSERT_EXISTS(range)
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break
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}
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// throwing exceptions from "ASSERT_EXISTS" during backtracking
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// causes severe performance degradations
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if (isBacktracking === true && range === undefined) {
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return undefined
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}
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ASSERT_EXISTS(range)
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if (this.peekChar(0) === "?") {
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this.consumeChar("?")
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range.greedy = false
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} else {
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range.greedy = true
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}
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range.type = "Quantifier"
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return range
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}
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RegExpParser.prototype.atom = function() {
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var atom
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switch (this.peekChar()) {
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case ".":
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atom = this.dotAll()
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break
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case "\\":
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atom = this.atomEscape()
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break
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case "[":
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atom = this.characterClass()
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break
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case "(":
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atom = this.group()
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break
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}
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if (atom === undefined && this.isPatternCharacter()) {
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atom = this.patternCharacter()
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}
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ASSERT_EXISTS(atom)
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if (this.isQuantifier()) {
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atom.quantifier = this.quantifier()
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}
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return atom
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}
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RegExpParser.prototype.dotAll = function() {
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this.consumeChar(".")
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return {
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type: "Set",
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complement: true,
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value: [cc("\n"), cc("\r"), cc("\u2028"), cc("\u2029")]
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}
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}
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RegExpParser.prototype.atomEscape = function() {
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this.consumeChar("\\")
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switch (this.peekChar()) {
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case "1":
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case "2":
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case "3":
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case "4":
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case "5":
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case "6":
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case "7":
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case "8":
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case "9":
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return this.decimalEscapeAtom()
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case "d":
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case "D":
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case "s":
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case "S":
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case "w":
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case "W":
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return this.characterClassEscape()
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case "f":
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case "n":
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case "r":
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case "t":
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case "v":
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return this.controlEscapeAtom()
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case "c":
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return this.controlLetterEscapeAtom()
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case "0":
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return this.nulCharacterAtom()
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case "x":
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return this.hexEscapeSequenceAtom()
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case "u":
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return this.regExpUnicodeEscapeSequenceAtom()
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default:
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return this.identityEscapeAtom()
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}
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}
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RegExpParser.prototype.decimalEscapeAtom = function() {
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var value = this.positiveInteger()
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return { type: "GroupBackReference", value: value }
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}
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RegExpParser.prototype.characterClassEscape = function() {
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var set
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var complement = false
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switch (this.popChar()) {
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case "d":
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set = digitsCharCodes
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break
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case "D":
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set = digitsCharCodes
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complement = true
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break
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case "s":
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set = whitespaceCodes
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break
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case "S":
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set = whitespaceCodes
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complement = true
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break
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case "w":
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set = wordCharCodes
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break
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case "W":
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set = wordCharCodes
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complement = true
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break
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}
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ASSERT_EXISTS(set)
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return { type: "Set", value: set, complement: complement }
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}
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RegExpParser.prototype.controlEscapeAtom = function() {
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var escapeCode
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switch (this.popChar()) {
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case "f":
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escapeCode = cc("\f")
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break
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case "n":
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escapeCode = cc("\n")
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break
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case "r":
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escapeCode = cc("\r")
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break
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case "t":
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escapeCode = cc("\t")
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break
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case "v":
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escapeCode = cc("\v")
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break
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}
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ASSERT_EXISTS(escapeCode)
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return { type: "Character", value: escapeCode }
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}
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RegExpParser.prototype.controlLetterEscapeAtom = function() {
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this.consumeChar("c")
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var letter = this.popChar()
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if (/[a-zA-Z]/.test(letter) === false) {
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throw Error("Invalid ")
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}
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var letterCode = letter.toUpperCase().charCodeAt(0) - 64
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return { type: "Character", value: letterCode }
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}
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RegExpParser.prototype.nulCharacterAtom = function() {
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// TODO implement '[lookahead ∉ DecimalDigit]'
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// TODO: for the deprecated octal escape sequence
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this.consumeChar("0")
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return { type: "Character", value: cc("\0") }
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}
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RegExpParser.prototype.hexEscapeSequenceAtom = function() {
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this.consumeChar("x")
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return this.parseHexDigits(2)
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}
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RegExpParser.prototype.regExpUnicodeEscapeSequenceAtom = function() {
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this.consumeChar("u")
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return this.parseHexDigits(4)
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}
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RegExpParser.prototype.identityEscapeAtom = function() {
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// TODO: implement "SourceCharacter but not UnicodeIDContinue"
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// // http://unicode.org/reports/tr31/#Specific_Character_Adjustments
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var escapedChar = this.popChar()
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return { type: "Character", value: cc(escapedChar) }
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}
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RegExpParser.prototype.classPatternCharacterAtom = function() {
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switch (this.peekChar()) {
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// istanbul ignore next
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case "\n":
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// istanbul ignore next
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case "\r":
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// istanbul ignore next
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case "\u2028":
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// istanbul ignore next
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case "\u2029":
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// istanbul ignore next
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case "\\":
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// istanbul ignore next
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case "]":
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throw Error("TBD")
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default:
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var nextChar = this.popChar()
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return { type: "Character", value: cc(nextChar) }
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}
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}
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RegExpParser.prototype.characterClass = function() {
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var set = []
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var complement = false
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this.consumeChar("[")
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if (this.peekChar(0) === "^") {
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this.consumeChar("^")
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complement = true
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}
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while (this.isClassAtom()) {
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var from = this.classAtom()
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var isFromSingleChar = from.type === "Character"
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if (isFromSingleChar && this.isRangeDash()) {
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this.consumeChar("-")
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var to = this.classAtom()
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var isToSingleChar = to.type === "Character"
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// a range can only be used when both sides are single characters
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if (isToSingleChar) {
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if (to.value < from.value) {
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throw Error("Range out of order in character class")
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}
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set.push({ from: from.value, to: to.value })
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} else {
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// literal dash
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insertToSet(from.value, set)
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set.push(cc("-"))
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insertToSet(to.value, set)
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}
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} else {
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insertToSet(from.value, set)
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}
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}
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this.consumeChar("]")
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return { type: "Set", complement: complement, value: set }
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}
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RegExpParser.prototype.classAtom = function() {
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switch (this.peekChar()) {
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// istanbul ignore next
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case "]":
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// istanbul ignore next
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case "\n":
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// istanbul ignore next
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case "\r":
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// istanbul ignore next
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case "\u2028":
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// istanbul ignore next
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case "\u2029":
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throw Error("TBD")
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case "\\":
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return this.classEscape()
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default:
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return this.classPatternCharacterAtom()
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}
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}
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RegExpParser.prototype.classEscape = function() {
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this.consumeChar("\\")
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switch (this.peekChar()) {
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// Matches a backspace.
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// (Not to be confused with \b word boundary outside characterClass)
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case "b":
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this.consumeChar("b")
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return { type: "Character", value: cc("\u0008") }
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case "d":
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case "D":
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case "s":
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case "S":
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case "w":
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case "W":
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return this.characterClassEscape()
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case "f":
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case "n":
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case "r":
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case "t":
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case "v":
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return this.controlEscapeAtom()
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case "c":
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return this.controlLetterEscapeAtom()
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|
case "0":
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|
return this.nulCharacterAtom()
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case "x":
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return this.hexEscapeSequenceAtom()
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case "u":
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return this.regExpUnicodeEscapeSequenceAtom()
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|
default:
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return this.identityEscapeAtom()
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}
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}
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|
RegExpParser.prototype.group = function() {
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var capturing = true
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this.consumeChar("(")
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switch (this.peekChar(0)) {
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case "?":
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this.consumeChar("?")
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|
this.consumeChar(":")
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capturing = false
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|
break
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|
default:
|
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this.groupIdx++
|
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break
|
|
}
|
|
var value = this.disjunction()
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|
this.consumeChar(")")
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|
|
|
var groupAst = {
|
|
type: "Group",
|
|
capturing: capturing,
|
|
value: value
|
|
}
|
|
|
|
if (capturing) {
|
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groupAst.idx = this.groupIdx
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}
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|
|
|
return groupAst
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}
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|
|
|
RegExpParser.prototype.positiveInteger = function() {
|
|
var number = this.popChar()
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|
|
|
// istanbul ignore next - can't ever get here due to previous lookahead checks
|
|
// still implementing this error checking in case this ever changes.
|
|
if (decimalPatternNoZero.test(number) === false) {
|
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throw Error("Expecting a positive integer")
|
|
}
|
|
|
|
while (decimalPattern.test(this.peekChar(0))) {
|
|
number += this.popChar()
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|
}
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|
|
|
return parseInt(number, 10)
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|
}
|
|
|
|
RegExpParser.prototype.integerIncludingZero = function() {
|
|
var number = this.popChar()
|
|
if (decimalPattern.test(number) === false) {
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|
throw Error("Expecting an integer")
|
|
}
|
|
|
|
while (decimalPattern.test(this.peekChar(0))) {
|
|
number += this.popChar()
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|
}
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|
|
|
return parseInt(number, 10)
|
|
}
|
|
|
|
RegExpParser.prototype.patternCharacter = function() {
|
|
var nextChar = this.popChar()
|
|
switch (nextChar) {
|
|
// istanbul ignore next
|
|
case "\n":
|
|
// istanbul ignore next
|
|
case "\r":
|
|
// istanbul ignore next
|
|
case "\u2028":
|
|
// istanbul ignore next
|
|
case "\u2029":
|
|
// istanbul ignore next
|
|
case "^":
|
|
// istanbul ignore next
|
|
case "$":
|
|
// istanbul ignore next
|
|
case "\\":
|
|
// istanbul ignore next
|
|
case ".":
|
|
// istanbul ignore next
|
|
case "*":
|
|
// istanbul ignore next
|
|
case "+":
|
|
// istanbul ignore next
|
|
case "?":
|
|
// istanbul ignore next
|
|
case "(":
|
|
// istanbul ignore next
|
|
case ")":
|
|
// istanbul ignore next
|
|
case "[":
|
|
// istanbul ignore next
|
|
case "|":
|
|
// istanbul ignore next
|
|
throw Error("TBD")
|
|
default:
|
|
return { type: "Character", value: cc(nextChar) }
|
|
}
|
|
}
|
|
RegExpParser.prototype.isRegExpFlag = function() {
|
|
switch (this.peekChar(0)) {
|
|
case "g":
|
|
case "i":
|
|
case "m":
|
|
case "u":
|
|
case "y":
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
RegExpParser.prototype.isRangeDash = function() {
|
|
return this.peekChar() === "-" && this.isClassAtom(1)
|
|
}
|
|
|
|
RegExpParser.prototype.isDigit = function() {
|
|
return decimalPattern.test(this.peekChar(0))
|
|
}
|
|
|
|
RegExpParser.prototype.isClassAtom = function(howMuch) {
|
|
if (howMuch === undefined) {
|
|
howMuch = 0
|
|
}
|
|
|
|
switch (this.peekChar(howMuch)) {
|
|
case "]":
|
|
case "\n":
|
|
case "\r":
|
|
case "\u2028":
|
|
case "\u2029":
|
|
return false
|
|
default:
|
|
return true
|
|
}
|
|
}
|
|
|
|
RegExpParser.prototype.isTerm = function() {
|
|
return this.isAtom() || this.isAssertion()
|
|
}
|
|
|
|
RegExpParser.prototype.isAtom = function() {
|
|
if (this.isPatternCharacter()) {
|
|
return true
|
|
}
|
|
|
|
switch (this.peekChar(0)) {
|
|
case ".":
|
|
case "\\": // atomEscape
|
|
case "[": // characterClass
|
|
// TODO: isAtom must be called before isAssertion - disambiguate
|
|
case "(": // group
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
RegExpParser.prototype.isAssertion = function() {
|
|
switch (this.peekChar(0)) {
|
|
case "^":
|
|
case "$":
|
|
return true
|
|
// '\b' or '\B'
|
|
case "\\":
|
|
switch (this.peekChar(1)) {
|
|
case "b":
|
|
case "B":
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
// '(?=' or '(?!'
|
|
case "(":
|
|
return (
|
|
this.peekChar(1) === "?" &&
|
|
(this.peekChar(2) === "=" || this.peekChar(2) === "!")
|
|
)
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
RegExpParser.prototype.isQuantifier = function() {
|
|
var prevState = this.saveState()
|
|
try {
|
|
return this.quantifier(true) !== undefined
|
|
} catch (e) {
|
|
return false
|
|
} finally {
|
|
this.restoreState(prevState)
|
|
}
|
|
}
|
|
|
|
RegExpParser.prototype.isPatternCharacter = function() {
|
|
switch (this.peekChar()) {
|
|
case "^":
|
|
case "$":
|
|
case "\\":
|
|
case ".":
|
|
case "*":
|
|
case "+":
|
|
case "?":
|
|
case "(":
|
|
case ")":
|
|
case "[":
|
|
case "|":
|
|
case "/":
|
|
case "\n":
|
|
case "\r":
|
|
case "\u2028":
|
|
case "\u2029":
|
|
return false
|
|
default:
|
|
return true
|
|
}
|
|
}
|
|
|
|
RegExpParser.prototype.parseHexDigits = function(howMany) {
|
|
var hexString = ""
|
|
for (var i = 0; i < howMany; i++) {
|
|
var hexChar = this.popChar()
|
|
if (hexDigitPattern.test(hexChar) === false) {
|
|
throw Error("Expecting a HexDecimal digits")
|
|
}
|
|
hexString += hexChar
|
|
}
|
|
var charCode = parseInt(hexString, 16)
|
|
return { type: "Character", value: charCode }
|
|
}
|
|
|
|
RegExpParser.prototype.peekChar = function(howMuch) {
|
|
if (howMuch === undefined) {
|
|
howMuch = 0
|
|
}
|
|
return this.input[this.idx + howMuch]
|
|
}
|
|
|
|
RegExpParser.prototype.popChar = function() {
|
|
var nextChar = this.peekChar(0)
|
|
this.consumeChar()
|
|
return nextChar
|
|
}
|
|
|
|
RegExpParser.prototype.consumeChar = function(char) {
|
|
if (char !== undefined && this.input[this.idx] !== char) {
|
|
throw Error(
|
|
"Expected: '" +
|
|
char +
|
|
"' but found: '" +
|
|
this.input[this.idx] +
|
|
"' at offset: " +
|
|
this.idx
|
|
)
|
|
}
|
|
|
|
if (this.idx >= this.input.length) {
|
|
throw Error("Unexpected end of input")
|
|
}
|
|
this.idx++
|
|
}
|
|
|
|
// consts and utilities
|
|
var hexDigitPattern = /[0-9a-fA-F]/
|
|
var decimalPattern = /[0-9]/
|
|
var decimalPatternNoZero = /[1-9]/
|
|
|
|
function cc(char) {
|
|
return char.charCodeAt(0)
|
|
}
|
|
|
|
function insertToSet(item, set) {
|
|
if (item.length !== undefined) {
|
|
item.forEach(function(subItem) {
|
|
set.push(subItem)
|
|
})
|
|
} else {
|
|
set.push(item)
|
|
}
|
|
}
|
|
|
|
function addFlag(flagObj, flagKey) {
|
|
if (flagObj[flagKey] === true) {
|
|
throw "duplicate flag " + flagKey
|
|
}
|
|
|
|
flagObj[flagKey] = true
|
|
}
|
|
|
|
function ASSERT_EXISTS(obj) {
|
|
// istanbul ignore next
|
|
if (obj === undefined) {
|
|
throw Error("Internal Error - Should never get here!")
|
|
}
|
|
}
|
|
|
|
// istanbul ignore next
|
|
function ASSERT_NEVER_REACH_HERE() {
|
|
throw Error("Internal Error - Should never get here!")
|
|
}
|
|
|
|
var i
|
|
var digitsCharCodes = []
|
|
for (i = cc("0"); i <= cc("9"); i++) {
|
|
digitsCharCodes.push(i)
|
|
}
|
|
|
|
var wordCharCodes = [cc("_")].concat(digitsCharCodes)
|
|
for (i = cc("a"); i <= cc("z"); i++) {
|
|
wordCharCodes.push(i)
|
|
}
|
|
|
|
for (i = cc("A"); i <= cc("Z"); i++) {
|
|
wordCharCodes.push(i)
|
|
}
|
|
|
|
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#character-classes
|
|
var whitespaceCodes = [
|
|
cc(" "),
|
|
cc("\f"),
|
|
cc("\n"),
|
|
cc("\r"),
|
|
cc("\t"),
|
|
cc("\v"),
|
|
cc("\t"),
|
|
cc("\u00a0"),
|
|
cc("\u1680"),
|
|
cc("\u2000"),
|
|
cc("\u2001"),
|
|
cc("\u2002"),
|
|
cc("\u2003"),
|
|
cc("\u2004"),
|
|
cc("\u2005"),
|
|
cc("\u2006"),
|
|
cc("\u2007"),
|
|
cc("\u2008"),
|
|
cc("\u2009"),
|
|
cc("\u200a"),
|
|
cc("\u2028"),
|
|
cc("\u2029"),
|
|
cc("\u202f"),
|
|
cc("\u205f"),
|
|
cc("\u3000"),
|
|
cc("\ufeff")
|
|
]
|
|
|
|
function BaseRegExpVisitor() {}
|
|
|
|
BaseRegExpVisitor.prototype.visitChildren = function(node) {
|
|
for (var key in node) {
|
|
var child = node[key]
|
|
/* istanbul ignore else */
|
|
if (node.hasOwnProperty(key)) {
|
|
if (child.type !== undefined) {
|
|
this.visit(child)
|
|
} else if (Array.isArray(child)) {
|
|
child.forEach(function(subChild) {
|
|
this.visit(subChild)
|
|
}, this)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
BaseRegExpVisitor.prototype.visit = function(node) {
|
|
switch (node.type) {
|
|
case "Pattern":
|
|
this.visitPattern(node)
|
|
break
|
|
case "Flags":
|
|
this.visitFlags(node)
|
|
break
|
|
case "Disjunction":
|
|
this.visitDisjunction(node)
|
|
break
|
|
case "Alternative":
|
|
this.visitAlternative(node)
|
|
break
|
|
case "StartAnchor":
|
|
this.visitStartAnchor(node)
|
|
break
|
|
case "EndAnchor":
|
|
this.visitEndAnchor(node)
|
|
break
|
|
case "WordBoundary":
|
|
this.visitWordBoundary(node)
|
|
break
|
|
case "NonWordBoundary":
|
|
this.visitNonWordBoundary(node)
|
|
break
|
|
case "Lookahead":
|
|
this.visitLookahead(node)
|
|
break
|
|
case "NegativeLookahead":
|
|
this.visitNegativeLookahead(node)
|
|
break
|
|
case "Character":
|
|
this.visitCharacter(node)
|
|
break
|
|
case "Set":
|
|
this.visitSet(node)
|
|
break
|
|
case "Group":
|
|
this.visitGroup(node)
|
|
break
|
|
case "GroupBackReference":
|
|
this.visitGroupBackReference(node)
|
|
break
|
|
case "Quantifier":
|
|
this.visitQuantifier(node)
|
|
break
|
|
}
|
|
|
|
this.visitChildren(node)
|
|
}
|
|
|
|
BaseRegExpVisitor.prototype.visitPattern = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitFlags = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitDisjunction = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitAlternative = function(node) {}
|
|
|
|
// Assertion
|
|
BaseRegExpVisitor.prototype.visitStartAnchor = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitEndAnchor = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitWordBoundary = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitNonWordBoundary = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitLookahead = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitNegativeLookahead = function(node) {}
|
|
|
|
// atoms
|
|
BaseRegExpVisitor.prototype.visitCharacter = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitSet = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitGroup = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitGroupBackReference = function(node) {}
|
|
|
|
BaseRegExpVisitor.prototype.visitQuantifier = function(node) {}
|
|
|
|
return {
|
|
RegExpParser: RegExpParser,
|
|
BaseRegExpVisitor: BaseRegExpVisitor,
|
|
VERSION: "0.4.0"
|
|
}
|
|
}
|
|
)
|