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app_vue/node_modules/webpack-sources/lib/helpers/createMappingsSerializer.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const ALPHABET =
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split("");
+
+const CONTINUATION_BIT = 0x20;
+
+/**
+ * @callback MappingsSerializer
+ * @param {number} generatedLine generated line
+ * @param {number} generatedColumn generated column
+ * @param {number} sourceIndex source index
+ * @param {number} originalLine original line
+ * @param {number} originalColumn generated line
+ * @param {number} nameIndex generated line
+ * @returns {string} result
+ */
+
+// eslint-disable-next-line valid-jsdoc
+/**
+ * @param {{ columns?: boolean }=} options options
+ * @returns {MappingsSerializer} mappings serializer
+ */
+const createMappingsSerializer = (options) => {
+	const linesOnly = options && options.columns === false;
+	return linesOnly
+		? createLinesOnlyMappingsSerializer()
+		: createFullMappingsSerializer();
+};
+
+const createFullMappingsSerializer = () => {
+	let currentLine = 1;
+	let currentColumn = 0;
+	let currentSourceIndex = 0;
+	let currentOriginalLine = 1;
+	let currentOriginalColumn = 0;
+	let currentNameIndex = 0;
+	let activeMapping = false;
+	let activeName = false;
+	let initial = true;
+	// eslint-disable-next-line valid-jsdoc
+	/** @type {MappingsSerializer} */
+	return (
+		generatedLine,
+		generatedColumn,
+		sourceIndex,
+		originalLine,
+		originalColumn,
+		nameIndex
+	) => {
+		if (activeMapping && currentLine === generatedLine) {
+			// A mapping is still active
+			if (
+				sourceIndex === currentSourceIndex &&
+				originalLine === currentOriginalLine &&
+				originalColumn === currentOriginalColumn &&
+				!activeName &&
+				nameIndex < 0
+			) {
+				// avoid repeating the same original mapping
+				return "";
+			}
+		} else {
+			// No mapping is active
+			if (sourceIndex < 0) {
+				// avoid writing unneccessary generated mappings
+				return "";
+			}
+		}
+
+		/** @type {undefined | string} */
+		let str;
+		if (currentLine < generatedLine) {
+			str = ";".repeat(generatedLine - currentLine);
+			currentLine = generatedLine;
+			currentColumn = 0;
+			initial = false;
+		} else if (initial) {
+			str = "";
+			initial = false;
+		} else {
+			str = ",";
+		}
+
+		/**
+		 * @param {number} value value
+		 * @returns {void}
+		 */
+		const writeValue = (value) => {
+			const sign = (value >>> 31) & 1;
+			const mask = value >> 31;
+			const absValue = (value + mask) ^ mask;
+			let data = (absValue << 1) | sign;
+			for (;;) {
+				const sextet = data & 0x1f;
+				data >>= 5;
+				if (data === 0) {
+					str += ALPHABET[sextet];
+					break;
+				} else {
+					str += ALPHABET[sextet | CONTINUATION_BIT];
+				}
+			}
+		};
+		writeValue(generatedColumn - currentColumn);
+		currentColumn = generatedColumn;
+		if (sourceIndex >= 0) {
+			activeMapping = true;
+			if (sourceIndex === currentSourceIndex) {
+				str += "A";
+			} else {
+				writeValue(sourceIndex - currentSourceIndex);
+				currentSourceIndex = sourceIndex;
+			}
+			writeValue(originalLine - currentOriginalLine);
+			currentOriginalLine = originalLine;
+			if (originalColumn === currentOriginalColumn) {
+				str += "A";
+			} else {
+				writeValue(originalColumn - currentOriginalColumn);
+				currentOriginalColumn = originalColumn;
+			}
+			if (nameIndex >= 0) {
+				writeValue(nameIndex - currentNameIndex);
+				currentNameIndex = nameIndex;
+				activeName = true;
+			} else {
+				activeName = false;
+			}
+		} else {
+			activeMapping = false;
+		}
+		return str;
+	};
+};
+
+const createLinesOnlyMappingsSerializer = () => {
+	let lastWrittenLine = 0;
+	let currentLine = 1;
+	let currentSourceIndex = 0;
+	let currentOriginalLine = 1;
+	// eslint-disable-next-line valid-jsdoc
+	/** @type {MappingsSerializer} */
+	return (
+		generatedLine,
+		_generatedColumn,
+		sourceIndex,
+		originalLine,
+		_originalColumn,
+		_nameIndex
+	) => {
+		if (sourceIndex < 0) {
+			// avoid writing generated mappings at all
+			return "";
+		}
+		if (lastWrittenLine === generatedLine) {
+			// avoid writing multiple original mappings per line
+			return "";
+		}
+		/** @type {undefined | string} */
+		let str;
+		/**
+		 * @param {number} value value
+		 * @returns {void}
+		 */
+		const writeValue = (value) => {
+			const sign = (value >>> 31) & 1;
+			const mask = value >> 31;
+			const absValue = (value + mask) ^ mask;
+			let data = (absValue << 1) | sign;
+			for (;;) {
+				const sextet = data & 0x1f;
+				data >>= 5;
+				if (data === 0) {
+					str += ALPHABET[sextet];
+					break;
+				} else {
+					str += ALPHABET[sextet | CONTINUATION_BIT];
+				}
+			}
+		};
+		lastWrittenLine = generatedLine;
+		if (generatedLine === currentLine + 1) {
+			currentLine = generatedLine;
+			if (sourceIndex === currentSourceIndex) {
+				if (originalLine === currentOriginalLine + 1) {
+					currentOriginalLine = originalLine;
+					return ";AACA";
+				} else {
+					str = ";AA";
+					writeValue(originalLine - currentOriginalLine);
+					currentOriginalLine = originalLine;
+					return str + "A";
+				}
+			} else {
+				str = ";A";
+				writeValue(sourceIndex - currentSourceIndex);
+				currentSourceIndex = sourceIndex;
+				writeValue(originalLine - currentOriginalLine);
+				currentOriginalLine = originalLine;
+				return str + "A";
+			}
+		} else {
+			str = ";".repeat(generatedLine - currentLine);
+			currentLine = generatedLine;
+			if (sourceIndex === currentSourceIndex) {
+				if (originalLine === currentOriginalLine + 1) {
+					currentOriginalLine = originalLine;
+					return str + "AACA";
+				} else {
+					str += "AA";
+					writeValue(originalLine - currentOriginalLine);
+					currentOriginalLine = originalLine;
+					return str + "A";
+				}
+			} else {
+				str += "A";
+				writeValue(sourceIndex - currentSourceIndex);
+				currentSourceIndex = sourceIndex;
+				writeValue(originalLine - currentOriginalLine);
+				currentOriginalLine = originalLine;
+				return str + "A";
+			}
+		}
+	};
+};
+
+module.exports = createMappingsSerializer;