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Diffstat (limited to 'tools/node_modules/eslint/lib/rules/space-before-function-paren.js')
-rw-r--r-- | tools/node_modules/eslint/lib/rules/space-before-function-paren.js | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/space-before-function-paren.js b/tools/node_modules/eslint/lib/rules/space-before-function-paren.js new file mode 100644 index 0000000000..8851c4587a --- /dev/null +++ b/tools/node_modules/eslint/lib/rules/space-before-function-paren.js @@ -0,0 +1,142 @@ +/** + * @fileoverview Rule to validate spacing before function paren. + * @author Mathias Schreck <https://github.com/lo1tuma> + */ +"use strict"; + +//------------------------------------------------------------------------------ +// Requirements +//------------------------------------------------------------------------------ + +const astUtils = require("../ast-utils"); + +//------------------------------------------------------------------------------ +// Rule Definition +//------------------------------------------------------------------------------ + +module.exports = { + meta: { + docs: { + description: "enforce consistent spacing before `function` definition opening parenthesis", + category: "Stylistic Issues", + recommended: false + }, + + fixable: "whitespace", + + schema: [ + { + oneOf: [ + { + enum: ["always", "never"] + }, + { + type: "object", + properties: { + anonymous: { + enum: ["always", "never", "ignore"] + }, + named: { + enum: ["always", "never", "ignore"] + }, + asyncArrow: { + enum: ["always", "never", "ignore"] + } + }, + additionalProperties: false + } + ] + } + ] + }, + + create(context) { + const sourceCode = context.getSourceCode(); + const baseConfig = typeof context.options[0] === "string" ? context.options[0] : "always"; + const overrideConfig = typeof context.options[0] === "object" ? context.options[0] : {}; + + /** + * Determines whether a function has a name. + * @param {ASTNode} node The function node. + * @returns {boolean} Whether the function has a name. + */ + function isNamedFunction(node) { + if (node.id) { + return true; + } + + const parent = node.parent; + + return parent.type === "MethodDefinition" || + (parent.type === "Property" && + ( + parent.kind === "get" || + parent.kind === "set" || + parent.method + ) + ); + } + + /** + * Gets the config for a given function + * @param {ASTNode} node The function node + * @returns {string} "always", "never", or "ignore" + */ + function getConfigForFunction(node) { + if (node.type === "ArrowFunctionExpression") { + + // Always ignore non-async functions and arrow functions without parens, e.g. async foo => bar + if (node.async && astUtils.isOpeningParenToken(sourceCode.getFirstToken(node, { skip: 1 }))) { + return overrideConfig.asyncArrow || baseConfig; + } + } else if (isNamedFunction(node)) { + return overrideConfig.named || baseConfig; + + // `generator-star-spacing` should warn anonymous generators. E.g. `function* () {}` + } else if (!node.generator) { + return overrideConfig.anonymous || baseConfig; + } + + return "ignore"; + } + + /** + * Checks the parens of a function node + * @param {ASTNode} node A function node + * @returns {void} + */ + function checkFunction(node) { + const functionConfig = getConfigForFunction(node); + + if (functionConfig === "ignore") { + return; + } + + const rightToken = sourceCode.getFirstToken(node, astUtils.isOpeningParenToken); + const leftToken = sourceCode.getTokenBefore(rightToken); + const hasSpacing = sourceCode.isSpaceBetweenTokens(leftToken, rightToken); + + if (hasSpacing && functionConfig === "never") { + context.report({ + node, + loc: leftToken.loc.end, + message: "Unexpected space before function parentheses.", + fix: fixer => fixer.removeRange([leftToken.range[1], rightToken.range[0]]) + }); + } else if (!hasSpacing && functionConfig === "always") { + context.report({ + node, + loc: leftToken.loc.end, + message: "Missing space before function parentheses.", + fix: fixer => fixer.insertTextAfter(leftToken, " ") + }); + } + } + + return { + ArrowFunctionExpression: checkFunction, + FunctionDeclaration: checkFunction, + FunctionExpression: checkFunction + }; + } +}; |