commit node_modules and generated files

node_modules/webpack/lib/JavascriptGenerator.js

@@ -0,0 +1,229 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+const { RawSource, ReplaceSource } = require("webpack-sources");
+
+// TODO: clean up this file
+// replace with newer constructs
+
+// TODO: remove DependencyVariables and replace them with something better
+
+class JavascriptGenerator {
+	generate(module, dependencyTemplates, runtimeTemplate) {
+		const originalSource = module.originalSource();
+		if (!originalSource) {
+			return new RawSource("throw new Error('No source available');");
+		}
+
+		const source = new ReplaceSource(originalSource);
+
+		this.sourceBlock(
+			module,
+			module,
+			[],
+			dependencyTemplates,
+			source,
+			runtimeTemplate
+		);
+
+		return source;
+	}
+
+	sourceBlock(
+		module,
+		block,
+		availableVars,
+		dependencyTemplates,
+		source,
+		runtimeTemplate
+	) {
+		for (const dependency of block.dependencies) {
+			this.sourceDependency(
+				dependency,
+				dependencyTemplates,
+				source,
+				runtimeTemplate
+			);
+		}
+
+		/**
+		 * Get the variables of all blocks that we need to inject.
+		 * These will contain the variable name and its expression.
+		 * The name will be added as a parameter in a IIFE the expression as its value.
+		 */
+		const vars = block.variables.reduce((result, value) => {
+			const variable = this.sourceVariables(
+				value,
+				availableVars,
+				dependencyTemplates,
+				runtimeTemplate
+			);
+
+			if (variable) {
+				result.push(variable);
+			}
+
+			return result;
+		}, []);
+
+		/**
+		 * if we actually have variables
+		 * this is important as how #splitVariablesInUniqueNamedChunks works
+		 * it will always return an array in an array which would lead to a IIFE wrapper around
+		 * a module if we do this with an empty vars array.
+		 */
+		if (vars.length > 0) {
+			/**
+			 * Split all variables up into chunks of unique names.
+			 * e.g. imagine you have the following variable names that need to be injected:
+			 * [foo, bar, baz, foo, some, more]
+			 * we can not inject "foo" twice, therefore we just make two IIFEs like so:
+			 * (function(foo, bar, baz){
+			 *   (function(foo, some, more){
+			 *     …
+			 *   }(…));
+			 * }(…));
+			 *
+			 * "splitVariablesInUniqueNamedChunks" splits the variables shown above up to this:
+			 * [[foo, bar, baz], [foo, some, more]]
+			 */
+			const injectionVariableChunks = this.splitVariablesInUniqueNamedChunks(
+				vars
+			);
+
+			// create all the beginnings of IIFEs
+			const functionWrapperStarts = injectionVariableChunks.map(
+				variableChunk => {
+					return this.variableInjectionFunctionWrapperStartCode(
+						variableChunk.map(variable => variable.name)
+					);
+				}
+			);
+
+			// and all the ends
+			const functionWrapperEnds = injectionVariableChunks.map(variableChunk => {
+				return this.variableInjectionFunctionWrapperEndCode(
+					module,
+					variableChunk.map(variable => variable.expression),
+					block
+				);
+			});
+
+			// join them to one big string
+			const varStartCode = functionWrapperStarts.join("");
+
+			// reverse the ends first before joining them, as the last added must be the inner most
+			const varEndCode = functionWrapperEnds.reverse().join("");
+
+			// if we have anything, add it to the source
+			if (varStartCode && varEndCode) {
+				const start = block.range ? block.range[0] : -10;
+				const end = block.range
+					? block.range[1]
+					: module.originalSource().size() + 1;
+				source.insert(start + 0.5, varStartCode);
+				source.insert(end + 0.5, "\n/* WEBPACK VAR INJECTION */" + varEndCode);
+			}
+		}
+
+		for (const childBlock of block.blocks) {
+			this.sourceBlock(
+				module,
+				childBlock,
+				availableVars.concat(vars),
+				dependencyTemplates,
+				source,
+				runtimeTemplate
+			);
+		}
+	}
+
+	sourceDependency(dependency, dependencyTemplates, source, runtimeTemplate) {
+		const template = dependencyTemplates.get(dependency.constructor);
+		if (!template) {
+			throw new Error(
+				"No template for dependency: " + dependency.constructor.name
+			);
+		}
+		template.apply(dependency, source, runtimeTemplate, dependencyTemplates);
+	}
+
+	sourceVariables(
+		variable,
+		availableVars,
+		dependencyTemplates,
+		runtimeTemplate
+	) {
+		const name = variable.name;
+		const expr = variable.expressionSource(
+			dependencyTemplates,
+			runtimeTemplate
+		);
+
+		if (
+			availableVars.some(
+				v => v.name === name && v.expression.source() === expr.source()
+			)
+		) {
+			return;
+		}
+		return {
+			name: name,
+			expression: expr
+		};
+	}
+
+	/*
+	 * creates the start part of a IIFE around the module to inject a variable name
+	 * (function(…){   <- this part
+	 * }.call(…))
+	 */
+	variableInjectionFunctionWrapperStartCode(varNames) {
+		const args = varNames.join(", ");
+		return `/* WEBPACK VAR INJECTION */(function(${args}) {`;
+	}
+
+	contextArgument(module, block) {
+		if (this === block) {
+			return module.exportsArgument;
+		}
+		return "this";
+	}
+
+	/*
+	 * creates the end part of a IIFE around the module to inject a variable name
+	 * (function(…){
+	 * }.call(…))   <- this part
+	 */
+	variableInjectionFunctionWrapperEndCode(module, varExpressions, block) {
+		const firstParam = this.contextArgument(module, block);
+		const furtherParams = varExpressions.map(e => e.source()).join(", ");
+		return `}.call(${firstParam}, ${furtherParams}))`;
+	}
+
+	splitVariablesInUniqueNamedChunks(vars) {
+		const startState = [[]];
+		return vars.reduce((chunks, variable) => {
+			const current = chunks[chunks.length - 1];
+			// check if variable with same name exists already
+			// if so create a new chunk of variables.
+			const variableNameAlreadyExists = current.some(
+				v => v.name === variable.name
+			);
+
+			if (variableNameAlreadyExists) {
+				// start new chunk with current variable
+				chunks.push([variable]);
+			} else {
+				// else add it to current chunk
+				current.push(variable);
+			}
+			return chunks;
+		}, startState);
+	}
+}
+
+module.exports = JavascriptGenerator;