优化

‘liusuyi’

2023-10-21 ae92b6823499cfab77201b4033922fa373fb37a3

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/*
    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