import {tokTypes as tt, Token, isNewLine, SourceLocation, getLineInfo, lineBreakG} from “../index” 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]

}