130 lines
3.9 KiB
JavaScript
130 lines
3.9 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const base64VLQ = require("./base64-vlq");
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const getNumberOfLines = require("./helpers").getNumberOfLines;
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const getUnfinishedLine = require("./helpers").getUnfinishedLine;
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const LINE_MAPPING = ";AACA";
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class SourceNode {
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constructor(generatedCode, source, originalSource, startingLine) {
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this.generatedCode = generatedCode;
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this.originalSource = originalSource;
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this.source = source;
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this.startingLine = startingLine || 1;
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this._numberOfLines = getNumberOfLines(this.generatedCode);
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this._endsWithNewLine = generatedCode[generatedCode.length - 1] === "\n";
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}
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clone() {
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return new SourceNode(this.generatedCode, this.source, this.originalSource, this.startingLine);
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}
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getGeneratedCode() {
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return this.generatedCode;
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}
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addGeneratedCode(code) {
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this.generatedCode += code;
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this._numberOfLines += getNumberOfLines(code);
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this._endsWithNewLine = code[code.length - 1] === "\n";
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}
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getMappings(mappingsContext) {
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if(!this.generatedCode)
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return "";
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const lines = this._numberOfLines;
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const sourceIdx = mappingsContext.ensureSource(this.source, this.originalSource);
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let mappings = "A"; // generated column 0
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if(mappingsContext.unfinishedGeneratedLine)
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mappings = "," + base64VLQ.encode(mappingsContext.unfinishedGeneratedLine);
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mappings += base64VLQ.encode(sourceIdx - mappingsContext.currentSource); // source index
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mappings += base64VLQ.encode(this.startingLine - mappingsContext.currentOriginalLine); // original line index
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mappings += "A"; // original column 0
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mappingsContext.currentSource = sourceIdx;
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mappingsContext.currentOriginalLine = this.startingLine + lines - 1;
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const unfinishedGeneratedLine = mappingsContext.unfinishedGeneratedLine = getUnfinishedLine(this.generatedCode)
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mappings += Array(lines).join(LINE_MAPPING);
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if(unfinishedGeneratedLine === 0) {
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mappings += ";";
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} else {
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if(lines !== 0) {
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mappings += LINE_MAPPING;
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}
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mappingsContext.currentOriginalLine++;
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}
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return mappings;
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}
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mapGeneratedCode(fn) {
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throw new Error("Cannot map generated code on a SourceMap. Normalize to SingleLineNode first.");
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}
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getNormalizedNodes() {
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var results = [];
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var currentLine = this.startingLine;
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var generatedCode = this.generatedCode;
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var index = 0;
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var indexEnd = generatedCode.length;
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while(index < indexEnd) {
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// get one generated line
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var nextLine = generatedCode.indexOf("\n", index) + 1;
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if(nextLine === 0) nextLine = indexEnd;
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var lineGenerated = generatedCode.substr(index, nextLine - index);
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results.push(new SingleLineNode(lineGenerated, this.source, this.originalSource, currentLine));
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// move cursors
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index = nextLine;
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currentLine++;
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}
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return results;
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}
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merge(otherNode) {
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if(otherNode instanceof SourceNode) {
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return this.mergeSourceNode(otherNode);
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} else if(otherNode instanceof SingleLineNode) {
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return this.mergeSingleLineNode(otherNode);
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}
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return false;
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}
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mergeSourceNode(otherNode) {
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if(this.source === otherNode.source &&
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this._endsWithNewLine &&
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this.startingLine + this._numberOfLines === otherNode.startingLine) {
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this.generatedCode += otherNode.generatedCode;
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this._numberOfLines += otherNode._numberOfLines;
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this._endsWithNewLine = otherNode._endsWithNewLine;
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return this;
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}
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return false;
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}
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mergeSingleLineNode(otherNode) {
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if(this.source === otherNode.source &&
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this._endsWithNewLine &&
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this.startingLine + this._numberOfLines === otherNode.line &&
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otherNode._numberOfLines <= 1) {
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this.addSingleLineNode(otherNode);
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return this;
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}
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return false;
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}
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addSingleLineNode(otherNode) {
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this.generatedCode += otherNode.generatedCode;
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this._numberOfLines += otherNode._numberOfLines
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this._endsWithNewLine = otherNode._endsWithNewLine;
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}
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}
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module.exports = SourceNode;
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const SingleLineNode = require("./SingleLineNode"); // circular dependency
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