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interpreter [2012/11/17 13:30]
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interpreter [2014/07/21 00:13]
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-====== Interpreter ====== +====== ​Tailspin Javascript ​Interpreter ====== 
-The Javascript interpreter used to run the algorithms on this wiki is a highly modified versions of the [[https://​github.com/​mozilla/​narcissus|Narcissus]] ​Javascript interpreter. ​It has been updated to run in web browsers ​and to be much more standards compliant. It has also been rewritten ​in [[continuation passing style]], so that the interpretation can be paused and controlled by the user.+The Tailspin ​Javascript interpreter used to run the algorithms on this wiki is a fully reversible, standards-compliant,​ meta-circular ​Javascript interpreter. ​As well as running ​in the browser ​and allowing algorithms ​to be visualised, it can run code both forwards and backwards in time. It is written ​in [[continuation passing style]], so that the interpretation can be paused and controlled by the user.
  
-The Javascript interpreter currently passes 97% of the [[http://test262.ecmascript.org|ECMAScript Language test262]] test suite. (The majority of the failures are currently due to "use strict"​ code.)+See [[http://wthimbleby.github.io/​tailspin/​|Tailspin]] on GitHub.
  
 +===== ES5.1 Compliance =====
 +Tailspin currently passes 99% of the [[http://​test262.ecmascript.org|ECMAScript Language test262]] test suite.
  
-^                                             ^ Passes ^  Total ^        % ^ +===== Reversibility ===== 
-| Ch06 Notational Conventions ​                ​| ​     1 |      1 |  100.00% | +Tailspin can optionally be run in a reversible mode, where state changes are recorded so that they can be undoneThis allows much more informative visualisations ​and interaction,​ at the cost of running slightly slower ​and a bit more memory
-| Ch07 Lexical Conventions ​                   |    696 |    715 |   ​97.34% | + 
-| Ch08 Types                                  |    182 |    182 |  100.00% | +In reversible mode almost all state changes can be undoneSome state changes such as ''​Object.freeze()''​ and ''​Object.seal()''​ are not reversible at the moment as Tailspin uses the browser'​s Javascript objects and the effects of these functions are permanent.
-| Ch09 Type Conversion ​and Testing ​           |    128 |    128 |  100.00% | +
-| Ch10 Executable Code and Execution Contexts |    345 |    377 |   91.51% | +
-| Ch11 Expressions ​                           |   1234 |   1320 |   ​93.48% | +
-| Ch12 Statements ​                            ​| ​   483 |    521 |   92.71% | +
-| Ch13 Function Definition ​                   |    154 |    230 |   66.96% | +
-| Ch14 Program ​                               |     18 |     24 |   75.00% | +
-| Ch15 Standard Built-in ECMAScript Objects ​  ​| ​  7998 |   8074 |   ​99.06% | +
-+
-| Totals ​                                     |  11239 |  11572 |   97.12% |+
interpreter.txt · Last modified: 2015/06/01 16:08 (external edit)