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locutil.js
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Created: Fri, Jul 4, 10:54

locutil.js
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	import {lineBreakG} from "./whitespace"

	// 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)
	}
	}
	}

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