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node_modules/webpack-sources/lib/ConcatSource.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+const Source = require("./Source");
+const RawSource = require("./RawSource");
+const streamChunks = require("./helpers/streamChunks");
+const { getMap, getSourceAndMap } = require("./helpers/getFromStreamChunks");
+
+const stringsAsRawSources = new WeakSet();
+
+class ConcatSource extends Source {
+	constructor() {
+		super();
+		this._children = [];
+		for (let i = 0; i < arguments.length; i++) {
+			const item = arguments[i];
+			if (item instanceof ConcatSource) {
+				for (const child of item._children) {
+					this._children.push(child);
+				}
+			} else {
+				this._children.push(item);
+			}
+		}
+		this._isOptimized = arguments.length === 0;
+	}
+
+	getChildren() {
+		if (!this._isOptimized) this._optimize();
+		return this._children;
+	}
+
+	add(item) {
+		if (item instanceof ConcatSource) {
+			for (const child of item._children) {
+				this._children.push(child);
+			}
+		} else {
+			this._children.push(item);
+		}
+		this._isOptimized = false;
+	}
+
+	addAllSkipOptimizing(items) {
+		for (const item of items) {
+			this._children.push(item);
+		}
+	}
+
+	buffer() {
+		if (!this._isOptimized) this._optimize();
+		const buffers = [];
+		for (const child of this._children) {
+			if (typeof child.buffer === "function") {
+				buffers.push(child.buffer());
+			} else {
+				const bufferOrString = child.source();
+				if (Buffer.isBuffer(bufferOrString)) {
+					buffers.push(bufferOrString);
+				} else {
+					// This will not happen
+					buffers.push(Buffer.from(bufferOrString, "utf-8"));
+				}
+			}
+		}
+		return Buffer.concat(buffers);
+	}
+
+	source() {
+		if (!this._isOptimized) this._optimize();
+		let source = "";
+		for (const child of this._children) {
+			source += child.source();
+		}
+		return source;
+	}
+
+	size() {
+		if (!this._isOptimized) this._optimize();
+		let size = 0;
+		for (const child of this._children) {
+			size += child.size();
+		}
+		return size;
+	}
+
+	map(options) {
+		return getMap(this, options);
+	}
+
+	sourceAndMap(options) {
+		return getSourceAndMap(this, options);
+	}
+
+	streamChunks(options, onChunk, onSource, onName) {
+		if (!this._isOptimized) this._optimize();
+		if (this._children.length === 1)
+			return this._children[0].streamChunks(options, onChunk, onSource, onName);
+		let currentLineOffset = 0;
+		let currentColumnOffset = 0;
+		let sourceMapping = new Map();
+		let nameMapping = new Map();
+		const finalSource = !!(options && options.finalSource);
+		let code = "";
+		let needToCloseMapping = false;
+		for (const item of this._children) {
+			const sourceIndexMapping = [];
+			const nameIndexMapping = [];
+			let lastMappingLine = 0;
+			const { generatedLine, generatedColumn, source } = streamChunks(
+				item,
+				options,
+				// eslint-disable-next-line no-loop-func
+				(
+					chunk,
+					generatedLine,
+					generatedColumn,
+					sourceIndex,
+					originalLine,
+					originalColumn,
+					nameIndex
+				) => {
+					const line = generatedLine + currentLineOffset;
+					const column =
+						generatedLine === 1
+							? generatedColumn + currentColumnOffset
+							: generatedColumn;
+					if (needToCloseMapping) {
+						if (generatedLine !== 1 || generatedColumn !== 0) {
+							onChunk(
+								undefined,
+								currentLineOffset + 1,
+								currentColumnOffset,
+								-1,
+								-1,
+								-1,
+								-1
+							);
+						}
+						needToCloseMapping = false;
+					}
+					const resultSourceIndex =
+						sourceIndex < 0 || sourceIndex >= sourceIndexMapping.length
+							? -1
+							: sourceIndexMapping[sourceIndex];
+					const resultNameIndex =
+						nameIndex < 0 || nameIndex >= nameIndexMapping.length
+							? -1
+							: nameIndexMapping[nameIndex];
+					lastMappingLine = resultSourceIndex < 0 ? 0 : generatedLine;
+					if (finalSource) {
+						if (chunk !== undefined) code += chunk;
+						if (resultSourceIndex >= 0) {
+							onChunk(
+								undefined,
+								line,
+								column,
+								resultSourceIndex,
+								originalLine,
+								originalColumn,
+								resultNameIndex
+							);
+						}
+					} else {
+						if (resultSourceIndex < 0) {
+							onChunk(chunk, line, column, -1, -1, -1, -1);
+						} else {
+							onChunk(
+								chunk,
+								line,
+								column,
+								resultSourceIndex,
+								originalLine,
+								originalColumn,
+								resultNameIndex
+							);
+						}
+					}
+				},
+				(i, source, sourceContent) => {
+					let globalIndex = sourceMapping.get(source);
+					if (globalIndex === undefined) {
+						sourceMapping.set(source, (globalIndex = sourceMapping.size));
+						onSource(globalIndex, source, sourceContent);
+					}
+					sourceIndexMapping[i] = globalIndex;
+				},
+				(i, name) => {
+					let globalIndex = nameMapping.get(name);
+					if (globalIndex === undefined) {
+						nameMapping.set(name, (globalIndex = nameMapping.size));
+						onName(globalIndex, name);
+					}
+					nameIndexMapping[i] = globalIndex;
+				}
+			);
+			if (source !== undefined) code += source;
+			if (needToCloseMapping) {
+				if (generatedLine !== 1 || generatedColumn !== 0) {
+					onChunk(
+						undefined,
+						currentLineOffset + 1,
+						currentColumnOffset,
+						-1,
+						-1,
+						-1,
+						-1
+					);
+					needToCloseMapping = false;
+				}
+			}
+			if (generatedLine > 1) {
+				currentColumnOffset = generatedColumn;
+			} else {
+				currentColumnOffset += generatedColumn;
+			}
+			needToCloseMapping =
+				needToCloseMapping ||
+				(finalSource && lastMappingLine === generatedLine);
+			currentLineOffset += generatedLine - 1;
+		}
+		return {
+			generatedLine: currentLineOffset + 1,
+			generatedColumn: currentColumnOffset,
+			source: finalSource ? code : undefined
+		};
+	}
+
+	updateHash(hash) {
+		if (!this._isOptimized) this._optimize();
+		hash.update("ConcatSource");
+		for (const item of this._children) {
+			item.updateHash(hash);
+		}
+	}
+
+	_optimize() {
+		const newChildren = [];
+		let currentString = undefined;
+		let currentRawSources = undefined;
+		const addStringToRawSources = string => {
+			if (currentRawSources === undefined) {
+				currentRawSources = string;
+			} else if (Array.isArray(currentRawSources)) {
+				currentRawSources.push(string);
+			} else {
+				currentRawSources = [
+					typeof currentRawSources === "string"
+						? currentRawSources
+						: currentRawSources.source(),
+					string
+				];
+			}
+		};
+		const addSourceToRawSources = source => {
+			if (currentRawSources === undefined) {
+				currentRawSources = source;
+			} else if (Array.isArray(currentRawSources)) {
+				currentRawSources.push(source.source());
+			} else {
+				currentRawSources = [
+					typeof currentRawSources === "string"
+						? currentRawSources
+						: currentRawSources.source(),
+					source.source()
+				];
+			}
+		};
+		const mergeRawSources = () => {
+			if (Array.isArray(currentRawSources)) {
+				const rawSource = new RawSource(currentRawSources.join(""));
+				stringsAsRawSources.add(rawSource);
+				newChildren.push(rawSource);
+			} else if (typeof currentRawSources === "string") {
+				const rawSource = new RawSource(currentRawSources);
+				stringsAsRawSources.add(rawSource);
+				newChildren.push(rawSource);
+			} else {
+				newChildren.push(currentRawSources);
+			}
+		};
+		for (const child of this._children) {
+			if (typeof child === "string") {
+				if (currentString === undefined) {
+					currentString = child;
+				} else {
+					currentString += child;
+				}
+			} else {
+				if (currentString !== undefined) {
+					addStringToRawSources(currentString);
+					currentString = undefined;
+				}
+				if (stringsAsRawSources.has(child)) {
+					addSourceToRawSources(child);
+				} else {
+					if (currentRawSources !== undefined) {
+						mergeRawSources();
+						currentRawSources = undefined;
+					}
+					newChildren.push(child);
+				}
+			}
+		}
+		if (currentString !== undefined) {
+			addStringToRawSources(currentString);
+		}
+		if (currentRawSources !== undefined) {
+			mergeRawSources();
+		}
+		this._children = newChildren;
+		this._isOptimized = true;
+	}
+}
+
+module.exports = ConcatSource;