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import {Parser} from "./state"
import {lineBreakG} from "./whitespace"
import {deprecate} from "util"
// These are used when `options.locations` is on, for the
// `startLoc` and `endLoc` properties.
export class Position {
constructor(line, col) {
this.line = line
this.column = col
}
offset(n) {
return new Position(this.line, this.column + n)
}
}
export class SourceLocation {
constructor(p, start, end) {
this.start = start
this.end = end
if (p.sourceFile !== null) this.source = p.sourceFile
}
}
// The `getLineInfo` function is mostly useful when the
// `locations` option is off (for performance reasons) and you
// want to find the line/column position for a given character
// offset. `input` should be the code string that the offset refers
// into.
export function getLineInfo(input, offset) {
for (let line = 1, cur = 0;;) {
lineBreakG.lastIndex = cur
let match = lineBreakG.exec(input)
if (match && match.index < offset) {
++line
cur = match.index + match[0].length
} else {
return new Position(line, offset - cur)
}
}
}
const pp = Parser.prototype
// This function is used to raise exceptions on parse errors. It
// takes an offset integer (into the current `input`) to indicate
// the location of the error, attaches the position to the end
// of the error message, and then raises a `SyntaxError` with that
// message.
pp.raise = function(pos, message) {
let loc = getLineInfo(this.input, pos)
message += " (" + loc.line + ":" + loc.column + ")"
let err = new SyntaxError(message)
err.pos = pos; err.loc = loc; err.raisedAt = this.pos
throw err
}
pp.curPosition = function() {
return new Position(this.curLine, this.pos - this.lineStart)
}
pp.markPosition = function() {
return this.options.locations ? [this.start, this.startLoc] : this.start
}
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