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