103 lines
2.3 KiB
JavaScript
103 lines
2.3 KiB
JavaScript
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/*
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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 Source = require("./Source");
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const RawSource = require("./RawSource");
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const { SourceNode } = require("source-map");
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const { getSourceAndMap, getMap } = require("./helpers");
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const REPLACE_REGEX = /\n(?=.|\s)/g;
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class PrefixSource extends Source {
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constructor(prefix, source) {
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super();
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this._source =
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typeof source === "string" || Buffer.isBuffer(source)
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? new RawSource(source, true)
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: source;
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this._prefix = prefix;
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}
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getPrefix() {
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return this._prefix;
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}
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original() {
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return this._source;
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}
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source() {
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const node = this._source.source();
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const prefix = this._prefix;
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return prefix + node.replace(REPLACE_REGEX, "\n" + prefix);
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}
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// TODO efficient buffer() implementation
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map(options) {
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return getMap(this, options);
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}
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sourceAndMap(options) {
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return getSourceAndMap(this, options);
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}
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node(options) {
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const node = this._source.node(options);
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const prefix = this._prefix;
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const output = [];
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const result = new SourceNode();
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node.walkSourceContents(function (source, content) {
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result.setSourceContent(source, content);
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});
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let needPrefix = true;
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node.walk(function (chunk, mapping) {
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const parts = chunk.split(/(\n)/);
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for (let i = 0; i < parts.length; i += 2) {
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const nl = i + 1 < parts.length;
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const part = parts[i] + (nl ? "\n" : "");
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if (part) {
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if (needPrefix) {
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output.push(prefix);
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}
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output.push(
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new SourceNode(
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mapping.line,
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mapping.column,
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mapping.source,
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part,
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mapping.name
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)
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);
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needPrefix = nl;
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}
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}
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});
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result.add(output);
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return result;
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}
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listMap(options) {
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const prefix = this._prefix;
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const map = this._source.listMap(options);
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let prefixNextLine = true;
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return map.mapGeneratedCode(function (code) {
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let updatedCode = code.replace(REPLACE_REGEX, "\n" + prefix);
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if (prefixNextLine) updatedCode = prefix + updatedCode;
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prefixNextLine = code.charCodeAt(code.length - 1) === 10; // === /\n$/.test(code)
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return updatedCode;
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});
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}
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updateHash(hash) {
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hash.update("PrefixSource");
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this._source.updateHash(hash);
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hash.update(this._prefix);
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}
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}
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module.exports = PrefixSource;
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