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467 lines
12 KiB
467 lines
12 KiB
/*
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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 { getMap, getSourceAndMap } = require("./helpers/getFromStreamChunks");
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const streamChunks = require("./helpers/streamChunks");
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const Source = require("./Source");
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const splitIntoLines = require("./helpers/splitIntoLines");
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// since v8 7.0, Array.prototype.sort is stable
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const hasStableSort =
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typeof process === "object" &&
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process.versions &&
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typeof process.versions.v8 === "string" &&
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!/^[0-6]\./.test(process.versions.v8);
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// This is larger than max string length
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const MAX_SOURCE_POSITION = 0x20000000;
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class Replacement {
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constructor(start, end, content, name) {
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this.start = start;
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this.end = end;
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this.content = content;
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this.name = name;
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if (!hasStableSort) {
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this.index = -1;
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}
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}
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}
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class ReplaceSource extends Source {
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constructor(source, name) {
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super();
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this._source = source;
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this._name = name;
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/** @type {Replacement[]} */
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this._replacements = [];
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this._isSorted = true;
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}
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getName() {
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return this._name;
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}
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getReplacements() {
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this._sortReplacements();
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return this._replacements;
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}
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replace(start, end, newValue, name) {
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if (typeof newValue !== "string")
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throw new Error(
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"insertion must be a string, but is a " + typeof newValue
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);
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this._replacements.push(new Replacement(start, end, newValue, name));
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this._isSorted = false;
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}
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insert(pos, newValue, name) {
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if (typeof newValue !== "string")
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throw new Error(
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"insertion must be a string, but is a " +
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typeof newValue +
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": " +
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newValue
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);
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this._replacements.push(new Replacement(pos, pos - 1, newValue, name));
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this._isSorted = false;
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}
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source() {
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if (this._replacements.length === 0) {
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return this._source.source();
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}
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let current = this._source.source();
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let pos = 0;
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const result = [];
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this._sortReplacements();
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for (const replacement of this._replacements) {
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const start = Math.floor(replacement.start);
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const end = Math.floor(replacement.end + 1);
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if (pos < start) {
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const offset = start - pos;
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result.push(current.slice(0, offset));
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current = current.slice(offset);
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pos = start;
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}
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result.push(replacement.content);
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if (pos < end) {
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const offset = end - pos;
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current = current.slice(offset);
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pos = end;
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}
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}
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result.push(current);
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return result.join("");
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}
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map(options) {
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if (this._replacements.length === 0) {
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return this._source.map(options);
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}
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return getMap(this, options);
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}
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sourceAndMap(options) {
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if (this._replacements.length === 0) {
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return this._source.sourceAndMap(options);
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}
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return getSourceAndMap(this, options);
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}
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original() {
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return this._source;
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}
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_sortReplacements() {
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if (this._isSorted) return;
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if (hasStableSort) {
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this._replacements.sort(function (a, b) {
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const diff1 = a.start - b.start;
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if (diff1 !== 0) return diff1;
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const diff2 = a.end - b.end;
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if (diff2 !== 0) return diff2;
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return 0;
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});
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} else {
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this._replacements.forEach((repl, i) => (repl.index = i));
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this._replacements.sort(function (a, b) {
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const diff1 = a.start - b.start;
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if (diff1 !== 0) return diff1;
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const diff2 = a.end - b.end;
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if (diff2 !== 0) return diff2;
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return a.index - b.index;
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});
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}
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this._isSorted = true;
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}
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streamChunks(options, onChunk, onSource, onName) {
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this._sortReplacements();
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const repls = this._replacements;
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let pos = 0;
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let i = 0;
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let replacmentEnd = -1;
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let nextReplacement =
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i < repls.length ? Math.floor(repls[i].start) : MAX_SOURCE_POSITION;
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let generatedLineOffset = 0;
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let generatedColumnOffset = 0;
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let generatedColumnOffsetLine = 0;
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const sourceContents = [];
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const nameMapping = new Map();
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const nameIndexMapping = [];
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const checkOriginalContent = (sourceIndex, line, column, expectedChunk) => {
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let content =
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sourceIndex < sourceContents.length
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? sourceContents[sourceIndex]
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: undefined;
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if (content === undefined) return false;
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if (typeof content === "string") {
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content = splitIntoLines(content);
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sourceContents[sourceIndex] = content;
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}
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const contentLine = line <= content.length ? content[line - 1] : null;
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if (contentLine === null) return false;
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return (
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contentLine.slice(column, column + expectedChunk.length) ===
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expectedChunk
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);
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};
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let { generatedLine, generatedColumn } = streamChunks(
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this._source,
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Object.assign({}, options, { finalSource: false }),
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(
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chunk,
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generatedLine,
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generatedColumn,
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sourceIndex,
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originalLine,
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originalColumn,
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nameIndex
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) => {
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let chunkPos = 0;
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let endPos = pos + chunk.length;
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// Skip over when it has been replaced
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if (replacmentEnd > pos) {
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// Skip over the whole chunk
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if (replacmentEnd >= endPos) {
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const line = generatedLine + generatedLineOffset;
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if (chunk.endsWith("\n")) {
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generatedLineOffset--;
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if (generatedColumnOffsetLine === line) {
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// undo exiting corrections form the current line
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generatedColumnOffset += generatedColumn;
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}
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} else if (generatedColumnOffsetLine === line) {
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generatedColumnOffset -= chunk.length;
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} else {
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generatedColumnOffset = -chunk.length;
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generatedColumnOffsetLine = line;
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}
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pos = endPos;
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return;
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}
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// Partially skip over chunk
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chunkPos = replacmentEnd - pos;
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if (
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checkOriginalContent(
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sourceIndex,
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originalLine,
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originalColumn,
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chunk.slice(0, chunkPos)
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)
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) {
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originalColumn += chunkPos;
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}
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pos += chunkPos;
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const line = generatedLine + generatedLineOffset;
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if (generatedColumnOffsetLine === line) {
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generatedColumnOffset -= chunkPos;
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} else {
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generatedColumnOffset = -chunkPos;
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generatedColumnOffsetLine = line;
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}
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generatedColumn += chunkPos;
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}
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// Is a replacement in the chunk?
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if (nextReplacement < endPos) {
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do {
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let line = generatedLine + generatedLineOffset;
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if (nextReplacement > pos) {
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// Emit chunk until replacement
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const offset = nextReplacement - pos;
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const chunkSlice = chunk.slice(chunkPos, chunkPos + offset);
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onChunk(
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chunkSlice,
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line,
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generatedColumn +
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(line === generatedColumnOffsetLine
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? generatedColumnOffset
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: 0),
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sourceIndex,
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originalLine,
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originalColumn,
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nameIndex < 0 || nameIndex >= nameIndexMapping.length
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? -1
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: nameIndexMapping[nameIndex]
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);
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generatedColumn += offset;
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chunkPos += offset;
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pos = nextReplacement;
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if (
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checkOriginalContent(
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sourceIndex,
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originalLine,
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originalColumn,
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chunkSlice
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)
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) {
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originalColumn += chunkSlice.length;
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}
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}
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// Insert replacement content splitted into chunks by lines
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const { content, name } = repls[i];
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let matches = splitIntoLines(content);
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let replacementNameIndex = nameIndex;
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if (sourceIndex >= 0 && name) {
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let globalIndex = nameMapping.get(name);
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if (globalIndex === undefined) {
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globalIndex = nameMapping.size;
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nameMapping.set(name, globalIndex);
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onName(globalIndex, name);
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}
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replacementNameIndex = globalIndex;
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}
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for (let m = 0; m < matches.length; m++) {
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const contentLine = matches[m];
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onChunk(
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contentLine,
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line,
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generatedColumn +
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(line === generatedColumnOffsetLine
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? generatedColumnOffset
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: 0),
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sourceIndex,
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originalLine,
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originalColumn,
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replacementNameIndex
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);
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// Only the first chunk has name assigned
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replacementNameIndex = -1;
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if (m === matches.length - 1 && !contentLine.endsWith("\n")) {
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if (generatedColumnOffsetLine === line) {
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generatedColumnOffset += contentLine.length;
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} else {
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generatedColumnOffset = contentLine.length;
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generatedColumnOffsetLine = line;
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}
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} else {
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generatedLineOffset++;
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line++;
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generatedColumnOffset = -generatedColumn;
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generatedColumnOffsetLine = line;
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}
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}
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// Remove replaced content by settings this variable
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replacmentEnd = Math.max(
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replacmentEnd,
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Math.floor(repls[i].end + 1)
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);
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// Move to next replacment
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i++;
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nextReplacement =
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i < repls.length
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? Math.floor(repls[i].start)
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: MAX_SOURCE_POSITION;
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// Skip over when it has been replaced
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const offset = chunk.length - endPos + replacmentEnd - chunkPos;
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if (offset > 0) {
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// Skip over whole chunk
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if (replacmentEnd >= endPos) {
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let line = generatedLine + generatedLineOffset;
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if (chunk.endsWith("\n")) {
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generatedLineOffset--;
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if (generatedColumnOffsetLine === line) {
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// undo exiting corrections form the current line
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generatedColumnOffset += generatedColumn;
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}
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} else if (generatedColumnOffsetLine === line) {
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generatedColumnOffset -= chunk.length - chunkPos;
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} else {
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generatedColumnOffset = chunkPos - chunk.length;
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generatedColumnOffsetLine = line;
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}
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pos = endPos;
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return;
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}
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// Partially skip over chunk
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const line = generatedLine + generatedLineOffset;
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if (
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checkOriginalContent(
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sourceIndex,
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originalLine,
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originalColumn,
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chunk.slice(chunkPos, chunkPos + offset)
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)
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) {
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originalColumn += offset;
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}
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chunkPos += offset;
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pos += offset;
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if (generatedColumnOffsetLine === line) {
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generatedColumnOffset -= offset;
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} else {
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generatedColumnOffset = -offset;
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generatedColumnOffsetLine = line;
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}
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generatedColumn += offset;
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}
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} while (nextReplacement < endPos);
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}
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// Emit remaining chunk
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if (chunkPos < chunk.length) {
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const chunkSlice = chunkPos === 0 ? chunk : chunk.slice(chunkPos);
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const line = generatedLine + generatedLineOffset;
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onChunk(
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chunkSlice,
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line,
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generatedColumn +
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(line === generatedColumnOffsetLine ? generatedColumnOffset : 0),
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sourceIndex,
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originalLine,
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originalColumn,
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nameIndex < 0 ? -1 : nameIndexMapping[nameIndex]
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);
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}
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pos = endPos;
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},
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(sourceIndex, source, sourceContent) => {
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while (sourceContents.length < sourceIndex)
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sourceContents.push(undefined);
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sourceContents[sourceIndex] = sourceContent;
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onSource(sourceIndex, source, sourceContent);
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},
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(nameIndex, name) => {
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let globalIndex = nameMapping.get(name);
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if (globalIndex === undefined) {
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globalIndex = nameMapping.size;
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nameMapping.set(name, globalIndex);
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onName(globalIndex, name);
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}
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nameIndexMapping[nameIndex] = globalIndex;
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}
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);
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// Handle remaining replacements
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let remainer = "";
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for (; i < repls.length; i++) {
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remainer += repls[i].content;
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}
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// Insert remaining replacements content splitted into chunks by lines
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let line = generatedLine + generatedLineOffset;
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let matches = splitIntoLines(remainer);
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for (let m = 0; m < matches.length; m++) {
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const contentLine = matches[m];
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onChunk(
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contentLine,
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line,
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generatedColumn +
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(line === generatedColumnOffsetLine ? generatedColumnOffset : 0),
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-1,
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-1,
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-1,
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-1
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);
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if (m === matches.length - 1 && !contentLine.endsWith("\n")) {
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if (generatedColumnOffsetLine === line) {
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generatedColumnOffset += contentLine.length;
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} else {
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generatedColumnOffset = contentLine.length;
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generatedColumnOffsetLine = line;
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}
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} else {
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generatedLineOffset++;
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line++;
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generatedColumnOffset = -generatedColumn;
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generatedColumnOffsetLine = line;
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}
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}
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return {
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generatedLine: line,
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generatedColumn:
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generatedColumn +
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(line === generatedColumnOffsetLine ? generatedColumnOffset : 0)
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};
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}
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updateHash(hash) {
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this._sortReplacements();
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hash.update("ReplaceSource");
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this._source.updateHash(hash);
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hash.update(this._name || "");
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for (const repl of this._replacements) {
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hash.update(`${repl.start}${repl.end}${repl.content}${repl.name}`);
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}
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}
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}
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module.exports = ReplaceSource;
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