source: frontend/node_modules/source-list-map/lib/SingleLineNode.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 = ";AAAA";

class SingleLineNode {

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

        clone() {
                return new SingleLineNode(this.generatedCode, this.source, this.originalSource, this.line);
        }

        getGeneratedCode() {
                return this.generatedCode;
        }

        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.line - mappingsContext.currentOriginalLine); // original line index
                mappings += "A"; // original column 0
                mappingsContext.currentSource = sourceIdx;
                mappingsContext.currentOriginalLine = this.line;
                const unfinishedGeneratedLine = mappingsContext.unfinishedGeneratedLine = getUnfinishedLine(this.generatedCode)
                mappings += Array(lines).join(LINE_MAPPING);
                if(unfinishedGeneratedLine === 0) {
                        mappings += ";";
                } else {
                        if(lines !== 0)
                                mappings += LINE_MAPPING;
                }
                return mappings;
        }

        getNormalizedNodes() {
                return [this];
        }

        mapGeneratedCode(fn) {
                const generatedCode = fn(this.generatedCode);
                return new SingleLineNode(generatedCode, this.source, this.originalSource, this.line);
        }

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

        mergeSingleLineNode(otherNode) {
                if(this.source === otherNode.source &&
                        this.originalSource === otherNode.originalSource) {
                        if(this.line === otherNode.line) {
                                this.generatedCode += otherNode.generatedCode;
                                this._numberOfLines += otherNode._numberOfLines;
                                this._endsWithNewLine = otherNode._endsWithNewLine;
                                return this;
                        } else if(this.line + 1 === otherNode.line && 
                                this._endsWithNewLine &&
                                this._numberOfLines === 1 && 
                                otherNode._numberOfLines <= 1) {
                                return new SourceNode(this.generatedCode + otherNode.generatedCode, this.source, this.originalSource, this.line);
                        }
                }
                return false;
        }
}

module.exports = SingleLineNode;

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