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

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

const base64VLQ = require("./base64-vlq");
const getNumberOfLines = require("./helpers").getNumberOfLines;
const getUnfinishedLine = require("./helpers").getUnfinishedLine;

const LINE_MAPPING = ";AACA";

class SourceNode {

        constructor(generatedCode, source, originalSource, startingLine) {
                this.generatedCode = generatedCode;
                this.originalSource = originalSource;
                this.source = source;
                this.startingLine = startingLine || 1;
                this._numberOfLines = getNumberOfLines(this.generatedCode);
                this._endsWithNewLine = generatedCode[generatedCode.length - 1] === "\n";
        }

        clone() {
                return new SourceNode(this.generatedCode, this.source, this.originalSource, this.startingLine);
        }

        getGeneratedCode() {
                return this.generatedCode;
        }

        addGeneratedCode(code) {
                this.generatedCode += code;
                this._numberOfLines += getNumberOfLines(code);
                this._endsWithNewLine = code[code.length - 1] === "\n";
        }

        getMappings(mappingsContext) {
                if(!this.generatedCode)
                        return "";
                const lines = this._numberOfLines;
                const sourceIdx = mappingsContext.ensureSource(this.source, this.originalSource);
                let mappings = "A"; // generated column 0
                if(mappingsContext.unfinishedGeneratedLine)
                        mappings = "," + base64VLQ.encode(mappingsContext.unfinishedGeneratedLine);
                mappings += base64VLQ.encode(sourceIdx - mappingsContext.currentSource); // source index
                mappings += base64VLQ.encode(this.startingLine - mappingsContext.currentOriginalLine); // original line index
                mappings += "A"; // original column 0
                mappingsContext.currentSource = sourceIdx;
                mappingsContext.currentOriginalLine = this.startingLine + lines - 1;
                const unfinishedGeneratedLine = mappingsContext.unfinishedGeneratedLine = getUnfinishedLine(this.generatedCode)
                mappings += Array(lines).join(LINE_MAPPING);
                if(unfinishedGeneratedLine === 0) {
                        mappings += ";";
                } else {
                        if(lines !== 0) {
                                mappings += LINE_MAPPING;
                        }
                        mappingsContext.currentOriginalLine++;
                }
                return mappings;
        }

        mapGeneratedCode(fn) {
                throw new Error("Cannot map generated code on a SourceMap. Normalize to SingleLineNode first.");
        }

        getNormalizedNodes() {
                var results = [];
                var currentLine = this.startingLine;
                var generatedCode = this.generatedCode;
                var index = 0;
                var indexEnd = generatedCode.length;
                while(index < indexEnd) {
                        // get one generated line
                        var nextLine = generatedCode.indexOf("\n", index) + 1;
                        if(nextLine === 0) nextLine = indexEnd;
                        var lineGenerated = generatedCode.substr(index, nextLine - index);

                        results.push(new SingleLineNode(lineGenerated, this.source, this.originalSource, currentLine));

                        // move cursors
                        index = nextLine;
                        currentLine++;
                }
                return results;
        }

        merge(otherNode) {
                if(otherNode instanceof SourceNode) {
                        return this.mergeSourceNode(otherNode);
                } else if(otherNode instanceof SingleLineNode) {
                        return this.mergeSingleLineNode(otherNode);
                }
                return false;
        }

        mergeSourceNode(otherNode) {
                if(this.source === otherNode.source &&
                        this._endsWithNewLine &&
                        this.startingLine + this._numberOfLines === otherNode.startingLine) {
                        this.generatedCode += otherNode.generatedCode;
                        this._numberOfLines += otherNode._numberOfLines;
                        this._endsWithNewLine = otherNode._endsWithNewLine;
                        return this;
                }
                return false;
        }

        mergeSingleLineNode(otherNode) {
                if(this.source === otherNode.source &&
                        this._endsWithNewLine &&
                        this.startingLine + this._numberOfLines === otherNode.line &&
                        otherNode._numberOfLines <= 1) {
                        this.addSingleLineNode(otherNode);
                        return this;
                }
                return false;
        }

        addSingleLineNode(otherNode) {
                this.generatedCode += otherNode.generatedCode;
                this._numberOfLines += otherNode._numberOfLines
                this._endsWithNewLine = otherNode._endsWithNewLine;
        }
}

module.exports = SourceNode;
const SingleLineNode = require("./SingleLineNode"); // circular dependency