MappingsContext.js
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	/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
	*/
	"use strict";

	class MappingsContext {
	constructor() {
	this.sourcesIndices = new Map();
	this.sourcesContent = new Map();
	this.hasSourceContent = false;
	this.currentOriginalLine = 1;
	this.currentSource = 0;
	this.unfinishedGeneratedLine = false;
	}

	ensureSource(source, originalSource) {
	let idx = this.sourcesIndices.get(source);
	if(typeof idx === "number") {
	return idx;
	}
	idx = this.sourcesIndices.size;
	this.sourcesIndices.set(source, idx);
	this.sourcesContent.set(source, originalSource)
	if(typeof originalSource === "string")
	this.hasSourceContent = true;
	return idx;
	}

	getArrays() {
	const sources = [];
	const sourcesContent = [];

	for(const pair of this.sourcesContent) {
	sources.push(pair[0]);
	sourcesContent.push(pair[1]);
	}

	return {
	sources,
	sourcesContent
	};
	}
	}
	module.exports = MappingsContext;