source: frontend/node_modules/source-list-map/lib/MappingsContext.js

/*
        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;