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-rw-r--r--node_modules/acorn/src/tokenize.js687
1 files changed, 687 insertions, 0 deletions
diff --git a/node_modules/acorn/src/tokenize.js b/node_modules/acorn/src/tokenize.js
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+++ b/node_modules/acorn/src/tokenize.js
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+import {isIdentifierStart, isIdentifierChar} from "./identifier"
+import {types as tt, keywords as keywordTypes} from "./tokentype"
+import {Parser} from "./state"
+import {SourceLocation} from "./locutil"
+import {lineBreak, lineBreakG, isNewLine, nonASCIIwhitespace} from "./whitespace"
+
+// Object type used to represent tokens. Note that normally, tokens
+// simply exist as properties on the parser object. This is only
+// used for the onToken callback and the external tokenizer.
+
+export class Token {
+ constructor(p) {
+ this.type = p.type
+ this.value = p.value
+ this.start = p.start
+ this.end = p.end
+ if (p.options.locations)
+ this.loc = new SourceLocation(p, p.startLoc, p.endLoc)
+ if (p.options.ranges)
+ this.range = [p.start, p.end]
+ }
+}
+
+// ## Tokenizer
+
+const pp = Parser.prototype
+
+// Are we running under Rhino?
+const isRhino = typeof Packages == "object" && Object.prototype.toString.call(Packages) == "[object JavaPackage]"
+
+// Move to the next token
+
+pp.next = function() {
+ if (this.options.onToken)
+ this.options.onToken(new Token(this))
+
+ this.lastTokEnd = this.end
+ this.lastTokStart = this.start
+ this.lastTokEndLoc = this.endLoc
+ this.lastTokStartLoc = this.startLoc
+ this.nextToken()
+}
+
+pp.getToken = function() {
+ this.next()
+ return new Token(this)
+}
+
+// If we're in an ES6 environment, make parsers iterable
+if (typeof Symbol !== "undefined")
+ pp[Symbol.iterator] = function() {
+ return {
+ next: () => {
+ let token = this.getToken()
+ return {
+ done: token.type === tt.eof,
+ value: token
+ }
+ }
+ }
+ }
+
+// Toggle strict mode. Re-reads the next number or string to please
+// pedantic tests (`"use strict"; 010;` should fail).
+
+pp.curContext = function() {
+ return this.context[this.context.length - 1]
+}
+
+// Read a single token, updating the parser object's token-related
+// properties.
+
+pp.nextToken = function() {
+ let curContext = this.curContext()
+ if (!curContext || !curContext.preserveSpace) this.skipSpace()
+
+ this.start = this.pos
+ if (this.options.locations) this.startLoc = this.curPosition()
+ if (this.pos >= this.input.length) return this.finishToken(tt.eof)
+
+ if (curContext.override) return curContext.override(this)
+ else this.readToken(this.fullCharCodeAtPos())
+}
+
+pp.readToken = function(code) {
+ // Identifier or keyword. '\uXXXX' sequences are allowed in
+ // identifiers, so '\' also dispatches to that.
+ if (isIdentifierStart(code, this.options.ecmaVersion >= 6) || code === 92 /* '\' */)
+ return this.readWord()
+
+ return this.getTokenFromCode(code)
+}
+
+pp.fullCharCodeAtPos = function() {
+ let code = this.input.charCodeAt(this.pos)
+ if (code <= 0xd7ff || code >= 0xe000) return code
+ let next = this.input.charCodeAt(this.pos + 1)
+ return (code << 10) + next - 0x35fdc00
+}
+
+pp.skipBlockComment = function() {
+ let startLoc = this.options.onComment && this.curPosition()
+ let start = this.pos, end = this.input.indexOf("*/", this.pos += 2)
+ if (end === -1) this.raise(this.pos - 2, "Unterminated comment")
+ this.pos = end + 2
+ if (this.options.locations) {
+ lineBreakG.lastIndex = start
+ let match
+ while ((match = lineBreakG.exec(this.input)) && match.index < this.pos) {
+ ++this.curLine
+ this.lineStart = match.index + match[0].length
+ }
+ }
+ if (this.options.onComment)
+ this.options.onComment(true, this.input.slice(start + 2, end), start, this.pos,
+ startLoc, this.curPosition())
+}
+
+pp.skipLineComment = function(startSkip) {
+ let start = this.pos
+ let startLoc = this.options.onComment && this.curPosition()
+ let ch = this.input.charCodeAt(this.pos += startSkip)
+ while (this.pos < this.input.length && ch !== 10 && ch !== 13 && ch !== 8232 && ch !== 8233) {
+ ++this.pos
+ ch = this.input.charCodeAt(this.pos)
+ }
+ if (this.options.onComment)
+ this.options.onComment(false, this.input.slice(start + startSkip, this.pos), start, this.pos,
+ startLoc, this.curPosition())
+}
+
+// Called at the start of the parse and after every token. Skips
+// whitespace and comments, and.
+
+pp.skipSpace = function() {
+ loop: while (this.pos < this.input.length) {
+ let ch = this.input.charCodeAt(this.pos)
+ switch (ch) {
+ case 32: case 160: // ' '
+ ++this.pos
+ break
+ case 13:
+ if (this.input.charCodeAt(this.pos + 1) === 10) {
+ ++this.pos
+ }
+ case 10: case 8232: case 8233:
+ ++this.pos
+ if (this.options.locations) {
+ ++this.curLine
+ this.lineStart = this.pos
+ }
+ break
+ case 47: // '/'
+ switch (this.input.charCodeAt(this.pos + 1)) {
+ case 42: // '*'
+ this.skipBlockComment()
+ break
+ case 47:
+ this.skipLineComment(2)
+ break
+ default:
+ break loop
+ }
+ break
+ default:
+ if (ch > 8 && ch < 14 || ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
+ ++this.pos
+ } else {
+ break loop
+ }
+ }
+ }
+}
+
+// Called at the end of every token. Sets `end`, `val`, and
+// maintains `context` and `exprAllowed`, and skips the space after
+// the token, so that the next one's `start` will point at the
+// right position.
+
+pp.finishToken = function(type, val) {
+ this.end = this.pos
+ if (this.options.locations) this.endLoc = this.curPosition()
+ let prevType = this.type
+ this.type = type
+ this.value = val
+
+ this.updateContext(prevType)
+}
+
+// ### Token reading
+
+// This is the function that is called to fetch the next token. It
+// is somewhat obscure, because it works in character codes rather
+// than characters, and because operator parsing has been inlined
+// into it.
+//
+// All in the name of speed.
+//
+pp.readToken_dot = function() {
+ let next = this.input.charCodeAt(this.pos + 1)
+ if (next >= 48 && next <= 57) return this.readNumber(true)
+ let next2 = this.input.charCodeAt(this.pos + 2)
+ if (this.options.ecmaVersion >= 6 && next === 46 && next2 === 46) { // 46 = dot '.'
+ this.pos += 3
+ return this.finishToken(tt.ellipsis)
+ } else {
+ ++this.pos
+ return this.finishToken(tt.dot)
+ }
+}
+
+pp.readToken_slash = function() { // '/'
+ let next = this.input.charCodeAt(this.pos + 1)
+ if (this.exprAllowed) { ++this.pos; return this.readRegexp() }
+ if (next === 61) return this.finishOp(tt.assign, 2)
+ return this.finishOp(tt.slash, 1)
+}
+
+pp.readToken_mult_modulo_exp = function(code) { // '%*'
+ let next = this.input.charCodeAt(this.pos + 1)
+ let size = 1
+ let tokentype = code === 42 ? tt.star : tt.modulo
+
+ // exponentiation operator ** and **=
+ if (this.options.ecmaVersion >= 7 && next === 42) {
+ ++size
+ tokentype = tt.starstar
+ next = this.input.charCodeAt(this.pos + 2)
+ }
+
+ if (next === 61) return this.finishOp(tt.assign, size + 1)
+ return this.finishOp(tokentype, size)
+}
+
+pp.readToken_pipe_amp = function(code) { // '|&'
+ let next = this.input.charCodeAt(this.pos + 1)
+ if (next === code) return this.finishOp(code === 124 ? tt.logicalOR : tt.logicalAND, 2)
+ if (next === 61) return this.finishOp(tt.assign, 2)
+ return this.finishOp(code === 124 ? tt.bitwiseOR : tt.bitwiseAND, 1)
+}
+
+pp.readToken_caret = function() { // '^'
+ let next = this.input.charCodeAt(this.pos + 1)
+ if (next === 61) return this.finishOp(tt.assign, 2)
+ return this.finishOp(tt.bitwiseXOR, 1)
+}
+
+pp.readToken_plus_min = function(code) { // '+-'
+ let next = this.input.charCodeAt(this.pos + 1)
+ if (next === code) {
+ if (next == 45 && this.input.charCodeAt(this.pos + 2) == 62 &&
+ lineBreak.test(this.input.slice(this.lastTokEnd, this.pos))) {
+ // A `-->` line comment
+ this.skipLineComment(3)
+ this.skipSpace()
+ return this.nextToken()
+ }
+ return this.finishOp(tt.incDec, 2)
+ }
+ if (next === 61) return this.finishOp(tt.assign, 2)
+ return this.finishOp(tt.plusMin, 1)
+}
+
+pp.readToken_lt_gt = function(code) { // '<>'
+ let next = this.input.charCodeAt(this.pos + 1)
+ let size = 1
+ if (next === code) {
+ size = code === 62 && this.input.charCodeAt(this.pos + 2) === 62 ? 3 : 2
+ if (this.input.charCodeAt(this.pos + size) === 61) return this.finishOp(tt.assign, size + 1)
+ return this.finishOp(tt.bitShift, size)
+ }
+ if (next == 33 && code == 60 && this.input.charCodeAt(this.pos + 2) == 45 &&
+ this.input.charCodeAt(this.pos + 3) == 45) {
+ if (this.inModule) this.unexpected()
+ // `<!--`, an XML-style comment that should be interpreted as a line comment
+ this.skipLineComment(4)
+ this.skipSpace()
+ return this.nextToken()
+ }
+ if (next === 61) size = 2
+ return this.finishOp(tt.relational, size)
+}
+
+pp.readToken_eq_excl = function(code) { // '=!'
+ let next = this.input.charCodeAt(this.pos + 1)
+ if (next === 61) return this.finishOp(tt.equality, this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2)
+ if (code === 61 && next === 62 && this.options.ecmaVersion >= 6) { // '=>'
+ this.pos += 2
+ return this.finishToken(tt.arrow)
+ }
+ return this.finishOp(code === 61 ? tt.eq : tt.prefix, 1)
+}
+
+pp.getTokenFromCode = function(code) {
+ switch (code) {
+ // The interpretation of a dot depends on whether it is followed
+ // by a digit or another two dots.
+ case 46: // '.'
+ return this.readToken_dot()
+
+ // Punctuation tokens.
+ case 40: ++this.pos; return this.finishToken(tt.parenL)
+ case 41: ++this.pos; return this.finishToken(tt.parenR)
+ case 59: ++this.pos; return this.finishToken(tt.semi)
+ case 44: ++this.pos; return this.finishToken(tt.comma)
+ case 91: ++this.pos; return this.finishToken(tt.bracketL)
+ case 93: ++this.pos; return this.finishToken(tt.bracketR)
+ case 123: ++this.pos; return this.finishToken(tt.braceL)
+ case 125: ++this.pos; return this.finishToken(tt.braceR)
+ case 58: ++this.pos; return this.finishToken(tt.colon)
+ case 63: ++this.pos; return this.finishToken(tt.question)
+
+ case 96: // '`'
+ if (this.options.ecmaVersion < 6) break
+ ++this.pos
+ return this.finishToken(tt.backQuote)
+
+ case 48: // '0'
+ let next = this.input.charCodeAt(this.pos + 1)
+ if (next === 120 || next === 88) return this.readRadixNumber(16) // '0x', '0X' - hex number
+ if (this.options.ecmaVersion >= 6) {
+ if (next === 111 || next === 79) return this.readRadixNumber(8) // '0o', '0O' - octal number
+ if (next === 98 || next === 66) return this.readRadixNumber(2) // '0b', '0B' - binary number
+ }
+ // Anything else beginning with a digit is an integer, octal
+ // number, or float.
+ case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
+ return this.readNumber(false)
+
+ // Quotes produce strings.
+ case 34: case 39: // '"', "'"
+ return this.readString(code)
+
+ // Operators are parsed inline in tiny state machines. '=' (61) is
+ // often referred to. `finishOp` simply skips the amount of
+ // characters it is given as second argument, and returns a token
+ // of the type given by its first argument.
+
+ case 47: // '/'
+ return this.readToken_slash()
+
+ case 37: case 42: // '%*'
+ return this.readToken_mult_modulo_exp(code)
+
+ case 124: case 38: // '|&'
+ return this.readToken_pipe_amp(code)
+
+ case 94: // '^'
+ return this.readToken_caret()
+
+ case 43: case 45: // '+-'
+ return this.readToken_plus_min(code)
+
+ case 60: case 62: // '<>'
+ return this.readToken_lt_gt(code)
+
+ case 61: case 33: // '=!'
+ return this.readToken_eq_excl(code)
+
+ case 126: // '~'
+ return this.finishOp(tt.prefix, 1)
+ }
+
+ this.raise(this.pos, "Unexpected character '" + codePointToString(code) + "'")
+}
+
+pp.finishOp = function(type, size) {
+ let str = this.input.slice(this.pos, this.pos + size)
+ this.pos += size
+ return this.finishToken(type, str)
+}
+
+// Parse a regular expression. Some context-awareness is necessary,
+// since a '/' inside a '[]' set does not end the expression.
+
+function tryCreateRegexp(src, flags, throwErrorAt, parser) {
+ try {
+ return new RegExp(src, flags)
+ } catch (e) {
+ if (throwErrorAt !== undefined) {
+ if (e instanceof SyntaxError) parser.raise(throwErrorAt, "Error parsing regular expression: " + e.message)
+ throw e
+ }
+ }
+}
+
+const regexpUnicodeSupport = !!tryCreateRegexp("\uffff", "u")
+
+pp.readRegexp = function() {
+ let escaped, inClass, start = this.pos
+ for (;;) {
+ if (this.pos >= this.input.length) this.raise(start, "Unterminated regular expression")
+ let ch = this.input.charAt(this.pos)
+ if (lineBreak.test(ch)) this.raise(start, "Unterminated regular expression")
+ if (!escaped) {
+ if (ch === "[") inClass = true
+ else if (ch === "]" && inClass) inClass = false
+ else if (ch === "/" && !inClass) break
+ escaped = ch === "\\"
+ } else escaped = false
+ ++this.pos
+ }
+ let content = this.input.slice(start, this.pos)
+ ++this.pos
+ // Need to use `readWord1` because '\uXXXX' sequences are allowed
+ // here (don't ask).
+ let mods = this.readWord1()
+ let tmp = content, tmpFlags = ""
+ if (mods) {
+ let validFlags = /^[gim]*$/
+ if (this.options.ecmaVersion >= 6) validFlags = /^[gimuy]*$/
+ if (!validFlags.test(mods)) this.raise(start, "Invalid regular expression flag")
+ if (mods.indexOf("u") >= 0) {
+ if (regexpUnicodeSupport) {
+ tmpFlags = "u"
+ } else {
+ // Replace each astral symbol and every Unicode escape sequence that
+ // possibly represents an astral symbol or a paired surrogate with a
+ // single ASCII symbol to avoid throwing on regular expressions that
+ // are only valid in combination with the `/u` flag.
+ // Note: replacing with the ASCII symbol `x` might cause false
+ // negatives in unlikely scenarios. For example, `[\u{61}-b]` is a
+ // perfectly valid pattern that is equivalent to `[a-b]`, but it would
+ // be replaced by `[x-b]` which throws an error.
+ tmp = tmp.replace(/\\u\{([0-9a-fA-F]+)\}/g, (_match, code, offset) => {
+ code = Number("0x" + code)
+ if (code > 0x10FFFF) this.raise(start + offset + 3, "Code point out of bounds")
+ return "x"
+ })
+ tmp = tmp.replace(/\\u([a-fA-F0-9]{4})|[\uD800-\uDBFF][\uDC00-\uDFFF]/g, "x")
+ tmpFlags = tmpFlags.replace("u", "")
+ }
+ }
+ }
+ // Detect invalid regular expressions.
+ let value = null
+ // Rhino's regular expression parser is flaky and throws uncatchable exceptions,
+ // so don't do detection if we are running under Rhino
+ if (!isRhino) {
+ tryCreateRegexp(tmp, tmpFlags, start, this)
+ // Get a regular expression object for this pattern-flag pair, or `null` in
+ // case the current environment doesn't support the flags it uses.
+ value = tryCreateRegexp(content, mods)
+ }
+ return this.finishToken(tt.regexp, {pattern: content, flags: mods, value: value})
+}
+
+// Read an integer in the given radix. Return null if zero digits
+// were read, the integer value otherwise. When `len` is given, this
+// will return `null` unless the integer has exactly `len` digits.
+
+pp.readInt = function(radix, len) {
+ let start = this.pos, total = 0
+ for (let i = 0, e = len == null ? Infinity : len; i < e; ++i) {
+ let code = this.input.charCodeAt(this.pos), val
+ if (code >= 97) val = code - 97 + 10 // a
+ else if (code >= 65) val = code - 65 + 10 // A
+ else if (code >= 48 && code <= 57) val = code - 48 // 0-9
+ else val = Infinity
+ if (val >= radix) break
+ ++this.pos
+ total = total * radix + val
+ }
+ if (this.pos === start || len != null && this.pos - start !== len) return null
+
+ return total
+}
+
+pp.readRadixNumber = function(radix) {
+ this.pos += 2 // 0x
+ let val = this.readInt(radix)
+ if (val == null) this.raise(this.start + 2, "Expected number in radix " + radix)
+ if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number")
+ return this.finishToken(tt.num, val)
+}
+
+// Read an integer, octal integer, or floating-point number.
+
+pp.readNumber = function(startsWithDot) {
+ let start = this.pos, isFloat = false, octal = this.input.charCodeAt(this.pos) === 48
+ if (!startsWithDot && this.readInt(10) === null) this.raise(start, "Invalid number")
+ if (octal && this.pos == start + 1) octal = false
+ let next = this.input.charCodeAt(this.pos)
+ if (next === 46 && !octal) { // '.'
+ ++this.pos
+ this.readInt(10)
+ isFloat = true
+ next = this.input.charCodeAt(this.pos)
+ }
+ if ((next === 69 || next === 101) && !octal) { // 'eE'
+ next = this.input.charCodeAt(++this.pos)
+ if (next === 43 || next === 45) ++this.pos // '+-'
+ if (this.readInt(10) === null) this.raise(start, "Invalid number")
+ isFloat = true
+ }
+ if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number")
+
+ let str = this.input.slice(start, this.pos), val
+ if (isFloat) val = parseFloat(str)
+ else if (!octal || str.length === 1) val = parseInt(str, 10)
+ else if (/[89]/.test(str) || this.strict) this.raise(start, "Invalid number")
+ else val = parseInt(str, 8)
+ return this.finishToken(tt.num, val)
+}
+
+// Read a string value, interpreting backslash-escapes.
+
+pp.readCodePoint = function() {
+ let ch = this.input.charCodeAt(this.pos), code
+
+ if (ch === 123) {
+ if (this.options.ecmaVersion < 6) this.unexpected()
+ let codePos = ++this.pos
+ code = this.readHexChar(this.input.indexOf("}", this.pos) - this.pos)
+ ++this.pos
+ if (code > 0x10FFFF) this.raise(codePos, "Code point out of bounds")
+ } else {
+ code = this.readHexChar(4)
+ }
+ return code
+}
+
+function codePointToString(code) {
+ // UTF-16 Decoding
+ if (code <= 0xFFFF) return String.fromCharCode(code)
+ code -= 0x10000
+ return String.fromCharCode((code >> 10) + 0xD800, (code & 1023) + 0xDC00)
+}
+
+pp.readString = function(quote) {
+ let out = "", chunkStart = ++this.pos
+ for (;;) {
+ if (this.pos >= this.input.length) this.raise(this.start, "Unterminated string constant")
+ let ch = this.input.charCodeAt(this.pos)
+ if (ch === quote) break
+ if (ch === 92) { // '\'
+ out += this.input.slice(chunkStart, this.pos)
+ out += this.readEscapedChar(false)
+ chunkStart = this.pos
+ } else {
+ if (isNewLine(ch)) this.raise(this.start, "Unterminated string constant")
+ ++this.pos
+ }
+ }
+ out += this.input.slice(chunkStart, this.pos++)
+ return this.finishToken(tt.string, out)
+}
+
+// Reads template string tokens.
+
+pp.readTmplToken = function() {
+ let out = "", chunkStart = this.pos
+ for (;;) {
+ if (this.pos >= this.input.length) this.raise(this.start, "Unterminated template")
+ let ch = this.input.charCodeAt(this.pos)
+ if (ch === 96 || ch === 36 && this.input.charCodeAt(this.pos + 1) === 123) { // '`', '${'
+ if (this.pos === this.start && this.type === tt.template) {
+ if (ch === 36) {
+ this.pos += 2
+ return this.finishToken(tt.dollarBraceL)
+ } else {
+ ++this.pos
+ return this.finishToken(tt.backQuote)
+ }
+ }
+ out += this.input.slice(chunkStart, this.pos)
+ return this.finishToken(tt.template, out)
+ }
+ if (ch === 92) { // '\'
+ out += this.input.slice(chunkStart, this.pos)
+ out += this.readEscapedChar(true)
+ chunkStart = this.pos
+ } else if (isNewLine(ch)) {
+ out += this.input.slice(chunkStart, this.pos)
+ ++this.pos
+ switch (ch) {
+ case 13:
+ if (this.input.charCodeAt(this.pos) === 10) ++this.pos
+ case 10:
+ out += "\n"
+ break
+ default:
+ out += String.fromCharCode(ch)
+ break
+ }
+ if (this.options.locations) {
+ ++this.curLine
+ this.lineStart = this.pos
+ }
+ chunkStart = this.pos
+ } else {
+ ++this.pos
+ }
+ }
+}
+
+// Used to read escaped characters
+
+pp.readEscapedChar = function(inTemplate) {
+ let ch = this.input.charCodeAt(++this.pos)
+ ++this.pos
+ switch (ch) {
+ case 110: return "\n" // 'n' -> '\n'
+ case 114: return "\r" // 'r' -> '\r'
+ case 120: return String.fromCharCode(this.readHexChar(2)) // 'x'
+ case 117: return codePointToString(this.readCodePoint()) // 'u'
+ case 116: return "\t" // 't' -> '\t'
+ case 98: return "\b" // 'b' -> '\b'
+ case 118: return "\u000b" // 'v' -> '\u000b'
+ case 102: return "\f" // 'f' -> '\f'
+ case 13: if (this.input.charCodeAt(this.pos) === 10) ++this.pos // '\r\n'
+ case 10: // ' \n'
+ if (this.options.locations) { this.lineStart = this.pos; ++this.curLine }
+ return ""
+ default:
+ if (ch >= 48 && ch <= 55) {
+ let octalStr = this.input.substr(this.pos - 1, 3).match(/^[0-7]+/)[0]
+ let octal = parseInt(octalStr, 8)
+ if (octal > 255) {
+ octalStr = octalStr.slice(0, -1)
+ octal = parseInt(octalStr, 8)
+ }
+ if (octalStr !== "0" && (this.strict || inTemplate)) {
+ this.raise(this.pos - 2, "Octal literal in strict mode")
+ }
+ this.pos += octalStr.length - 1
+ return String.fromCharCode(octal)
+ }
+ return String.fromCharCode(ch)
+ }
+}
+
+// Used to read character escape sequences ('\x', '\u', '\U').
+
+pp.readHexChar = function(len) {
+ let codePos = this.pos
+ let n = this.readInt(16, len)
+ if (n === null) this.raise(codePos, "Bad character escape sequence")
+ return n
+}
+
+// Read an identifier, and return it as a string. Sets `this.containsEsc`
+// to whether the word contained a '\u' escape.
+//
+// Incrementally adds only escaped chars, adding other chunks as-is
+// as a micro-optimization.
+
+pp.readWord1 = function() {
+ this.containsEsc = false
+ let word = "", first = true, chunkStart = this.pos
+ let astral = this.options.ecmaVersion >= 6
+ while (this.pos < this.input.length) {
+ let ch = this.fullCharCodeAtPos()
+ if (isIdentifierChar(ch, astral)) {
+ this.pos += ch <= 0xffff ? 1 : 2
+ } else if (ch === 92) { // "\"
+ this.containsEsc = true
+ word += this.input.slice(chunkStart, this.pos)
+ let escStart = this.pos
+ if (this.input.charCodeAt(++this.pos) != 117) // "u"
+ this.raise(this.pos, "Expecting Unicode escape sequence \\uXXXX")
+ ++this.pos
+ let esc = this.readCodePoint()
+ if (!(first ? isIdentifierStart : isIdentifierChar)(esc, astral))
+ this.raise(escStart, "Invalid Unicode escape")
+ word += codePointToString(esc)
+ chunkStart = this.pos
+ } else {
+ break
+ }
+ first = false
+ }
+ return word + this.input.slice(chunkStart, this.pos)
+}
+
+// Read an identifier or keyword token. Will check for reserved
+// words when necessary.
+
+pp.readWord = function() {
+ let word = this.readWord1()
+ let type = tt.name
+ if (this.keywords.test(word)) {
+ if (this.containsEsc) this.raiseRecoverable(this.start, "Escape sequence in keyword " + word)
+ type = keywordTypes[word]
+ }
+ return this.finishToken(type, word)
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-09-11 23:33:11 +0000