tokenize.js
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import {tokTypes as tt, Token, isNewLine, SourceLocation, getLineInfo, lineBreakG} from "acorn"
import {LooseParser} from "./state"
const lp = LooseParser.prototype
function isSpace(ch) {
return (ch < 14 && ch > 8) || ch === 32 || ch === 160 || isNewLine(ch)
}
lp.next = function() {
this.last = this.tok
if (this.ahead.length)
this.tok = this.ahead.shift()
else
this.tok = this.readToken()
if (this.tok.start >= this.nextLineStart) {
while (this.tok.start >= this.nextLineStart) {
this.curLineStart = this.nextLineStart
this.nextLineStart = this.lineEnd(this.curLineStart) + 1
}
this.curIndent = this.indentationAfter(this.curLineStart)
}
}
lp.readToken = function() {
for (;;) {
try {
this.toks.next()
if (this.toks.type === tt.dot &&
this.input.substr(this.toks.end, 1) === "." &&
this.options.ecmaVersion >= 6) {
this.toks.end++
this.toks.type = tt.ellipsis
}
return new Token(this.toks)
} catch(e) {
if (!(e instanceof SyntaxError)) throw e
// Try to skip some text, based on the error message, and then continue
let msg = e.message, pos = e.raisedAt, replace = true
if (/unterminated/i.test(msg)) {
pos = this.lineEnd(e.pos + 1)
if (/string/.test(msg)) {
replace = {start: e.pos, end: pos, type: tt.string, value: this.input.slice(e.pos + 1, pos)}
} else if (/regular expr/i.test(msg)) {
let re = this.input.slice(e.pos, pos)
try { re = new RegExp(re) } catch(e) {}
replace = {start: e.pos, end: pos, type: tt.regexp, value: re}
} else if (/template/.test(msg)) {
replace = {start: e.pos, end: pos,
type: tt.template,
value: this.input.slice(e.pos, pos)}
} else {
replace = false
}
} else if (/invalid (unicode|regexp|number)|expecting unicode|octal literal|is reserved|directly after number|expected number in radix/i.test(msg)) {
while (pos < this.input.length && !isSpace(this.input.charCodeAt(pos))) ++pos
} else if (/character escape|expected hexadecimal/i.test(msg)) {
while (pos < this.input.length) {
let ch = this.input.charCodeAt(pos++)
if (ch === 34 || ch === 39 || isNewLine(ch)) break
}
} else if (/unexpected character/i.test(msg)) {
pos++
replace = false
} else if (/regular expression/i.test(msg)) {
replace = true
} else {
throw e
}
this.resetTo(pos)
if (replace === true) replace = {start: pos, end: pos, type: tt.name, value: "✖"}
if (replace) {
if (this.options.locations)
replace.loc = new SourceLocation(
this.toks,
getLineInfo(this.input, replace.start),
getLineInfo(this.input, replace.end))
return replace
}
}
}
}
lp.resetTo = function(pos) {
this.toks.pos = pos
let ch = this.input.charAt(pos - 1)
this.toks.exprAllowed = !ch || /[\[\{\(,;:?\/*=+\-~!|&%^<>]/.test(ch) ||
/[enwfd]/.test(ch) &&
/\b(keywords|case|else|return|throw|new|in|(instance|type)of|delete|void)$/.test(this.input.slice(pos - 10, pos))
if (this.options.locations) {
this.toks.curLine = 1
this.toks.lineStart = lineBreakG.lastIndex = 0
let match
while ((match = lineBreakG.exec(this.input)) && match.index < pos) {
++this.toks.curLine
this.toks.lineStart = match.index + match[0].length
}
}
}
lp.lookAhead = function(n) {
while (n > this.ahead.length)
this.ahead.push(this.readToken())
return this.ahead[n - 1]
}