node/tools/eslint/lib/rules/no-spaced-func.js

/**
 * @fileoverview Rule to check that spaced function application
 * @author Matt DuVall <http://www.mattduvall.com>
 */

"use strict";

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

module.exports = function(context) {

    var sourceCode = context.getSourceCode();

    /**
     * Check if open space is present in a function name
     * @param {ASTNode} node node to evaluate
     * @returns {void}
     * @private
     */
    function detectOpenSpaces(node) {
        var lastCalleeToken = sourceCode.getLastToken(node.callee),
            prevToken = lastCalleeToken,
            parenToken = sourceCode.getTokenAfter(lastCalleeToken);

        // advances to an open parenthesis.
        while (
            parenToken &&
            parenToken.range[1] < node.range[1] &&
            parenToken.value !== "("
        ) {
            prevToken = parenToken;
            parenToken = sourceCode.getTokenAfter(parenToken);
        }

        // look for a space between the callee and the open paren
        if (parenToken &&
            parenToken.range[1] < node.range[1] &&
            sourceCode.isSpaceBetweenTokens(prevToken, parenToken)
        ) {
            context.report({
                node: node,
                loc: lastCalleeToken.loc.start,
                message: "Unexpected space between function name and paren.",
                fix: function(fixer) {
                    return fixer.removeRange([prevToken.range[1], parenToken.range[0]]);
                }
            });
        }
    }

    return {
        "CallExpression": detectOpenSpaces,
        "NewExpression": detectOpenSpaces
    };

};

module.exports.schema = [];