function-toString-builtin-name.js

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// Repeats the test from 'Function/function-toString-builtin.js' and additionally

// verifies the name matches the expected value.

//

// This behaviour is not required by the ECMAScript standard.

// Greatly (!) simplified patterns for the PropertyName production.

var propertyName = [

    // PropertyName :: LiteralPropertyName :: IdentifierName

    "\\w+",

    // PropertyName :: LiteralPropertyName :: StringLiteral

    "(?:'[^']*')",

    "(?:\"[^\"]*\")",

    // PropertyName :: LiteralPropertyName :: NumericLiteral

    "\\d+",

    // PropertyName :: ComputedPropertyName

    "(?:\\[[^\\]]+\\])",

].join("|")

var nativeCode = RegExp([

    "^", "function", ("(" + propertyName + ")?"), "\\(", "\\)", "\\{", "\\[native code\\]", "\\}", "$"

].join("\\s*"));

function assertFunctionName(fun, expected) {

    var match = nativeCode.exec(fun.toString());

    assertEq(match[1], expected);

// Bound functions are considered built-ins.

assertFunctionName(function(){}.bind(), undefined);

assertFunctionName(function fn(){}.bind(), undefined);

// Built-ins which are well-known intrinsic objects.

assertFunctionName(Array, "Array");

assertFunctionName(Object.prototype.toString, "toString");

assertFunctionName(decodeURI, "decodeURI");

// Other built-in functions.

assertFunctionName(Math.asin, "asin");

assertFunctionName(String.prototype.blink, "blink");

assertFunctionName(RegExp.prototype[Symbol.split], "[Symbol.split]");

// Built-in getter functions.

assertFunctionName(Object.getOwnPropertyDescriptor(RegExp.prototype, "flags").get, "flags");

assertFunctionName(Object.getOwnPropertyDescriptor(Object.prototype, "__proto__").get, "__proto__");

// Built-in setter functions.

assertFunctionName(Object.getOwnPropertyDescriptor(Object.prototype, "__proto__").set, "__proto__");

if (typeof reportCompare === "function")

    reportCompare(0, 0);