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Diffstat (limited to 'tools/node_modules/eslint/lib/rules/no-label-var.js')
-rw-r--r-- | tools/node_modules/eslint/lib/rules/no-label-var.js | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/lib/rules/no-label-var.js b/tools/node_modules/eslint/lib/rules/no-label-var.js new file mode 100644 index 0000000000..954066aef3 --- /dev/null +++ b/tools/node_modules/eslint/lib/rules/no-label-var.js @@ -0,0 +1,69 @@ +/** + * @fileoverview Rule to flag labels that are the same as an identifier + * @author Ian Christian Myers + */ + +"use strict"; + +//------------------------------------------------------------------------------ +// Requirements +//------------------------------------------------------------------------------ + +const astUtils = require("../ast-utils"); + +//------------------------------------------------------------------------------ +// Rule Definition +//------------------------------------------------------------------------------ + +module.exports = { + meta: { + docs: { + description: "disallow labels that share a name with a variable", + category: "Variables", + recommended: false + }, + + schema: [] + }, + + create(context) { + + //-------------------------------------------------------------------------- + // Helpers + //-------------------------------------------------------------------------- + + /** + * Check if the identifier is present inside current scope + * @param {Object} scope current scope + * @param {string} name To evaluate + * @returns {boolean} True if its present + * @private + */ + function findIdentifier(scope, name) { + return astUtils.getVariableByName(scope, name) !== null; + } + + //-------------------------------------------------------------------------- + // Public API + //-------------------------------------------------------------------------- + + return { + + LabeledStatement(node) { + + // Fetch the innermost scope. + const scope = context.getScope(); + + /* + * Recursively find the identifier walking up the scope, starting + * with the innermost scope. + */ + if (findIdentifier(scope, node.label.name)) { + context.report({ node, message: "Found identifier with same name as label." }); + } + } + + }; + + } +}; |