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Javascript Semantics in K

This is a Javascript semantics, based on ECMAScript 5.1 specification. It defines the language core semantics and several standard built-in objects.

Our semantics has been tested against ECMAScript conformance test suite, and passes all 2,782 core language tests.

To execute this semantics, compile the semantics:

./build.sh

and run your programs:

./run.sh <your-javascript-program>.js

You can run all of ECMAScript conformance test suite (11,566 tests in total):

./run-test262-all.sh

or selectively run its core part (2,782 tests in total):

./run-test262-core.sh

or run separately each positive and negative part of it:

./run-test262-core-positive.sh

./run-test262-core-negative.sh

Among the 2,782 core tests, our semantics reports parsing errors for the following programs, which is, however, a correct behavior according to the the language standard ECMAScript 5.1 specification. These programs have function declarations inside the local block such as try or while loop, while the function declaration is only allowed in the top-level (refer to the grammar specification Annex A.5 Functions and Programs. This grammar, however, will be revised to cover these programs in the next version Draft Specification of Ecma-262 Edition 6.

test262-d067d2f0ca30/test/suite/ch10/10.4/10.4.2/10.4.2-1-2.js
test262-d067d2f0ca30/test/suite/ch12/12.14/12.14-13.js
test262-d067d2f0ca30/test/suite/ch12/12.8/S12.8_A3.js
test262-d067d2f0ca30/test/suite/ch12/12.8/S12.8_A4_T1.js
test262-d067d2f0ca30/test/suite/ch12/12.8/S12.8_A4_T2.js
test262-d067d2f0ca30/test/suite/ch12/12.8/S12.8_A4_T3.js

Currently, the standard built-in objects are supported as follows:

  • Fully defined:

    • Object
    • Function
    • Boolean
    • Error

  • Partially defined:

    • Global
    • Array
    • String
    • Number

  • Not defined:

    • Math
    • Date
    • RegExp
    • JSON