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interpreter [2012/11/16 00:04]
will
interpreter [2015/06/01 16:08] (current)
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-====== Interpreter ====== +====== ​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 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 95% of the [[http://test262.ecmascript.org|ECMAScript Language test262]] test suite. (A lot of the failures currently are due to "use strict"​ code or unicode issues.)+Based on [[https://github.com/​mozilla/​narcissus|Narcissus]].
  
 +===== ES5.1 Compliance =====
 +It currently passes 99% of the [[http://​test262.ecmascript.org|ECMAScript Language test262]] test suite.
 +
 +===== Reversibility =====
 +And can optionally be run in a reversible mode, where state changes are recorded so that they can be undone. This allows much more informative visualisations and interaction,​ at the cost of running slightly slower and a bit more memory.
 +
 +In reversible mode almost all state changes can be undone. Some state changes such as ''​Object.freeze()''​ and ''​Object.seal()''​ are not reversible at the moment as the interpreter uses the browser'​s Javascript objects and the effects of these functions are permanent.
  
-^                                             ^ Passes ^  Total ^        % ^ 
-| Ch06 Notational Conventions ​                ​| ​     1 |      1 |  100.00% | 
-| Ch07 Lexical Conventions ​                   |    618 |    715 |   ​86.43% | 
-| Ch08 Types                                  |    182 |    182 |  100.00% | 
-| Ch09 Type Conversion and Testing ​           |    128 |    128 |  100.00% | 
-| Ch10 Executable Code and Execution Contexts |    265 |    377 |   ​70.29% | 
-| Ch11 Expressions ​                           |   1230 |   1320 |   ​93.18% | 
-| Ch12 Statements ​                            ​| ​   480 |    521 |   ​92.13% | 
-| Ch13 Function Definition ​                   |    154 |    230 |   ​66.96% | 
-| Ch14 Program ​                               |     18 |     24 |   ​75.00% | 
-| Ch15 Standard Built-in ECMAScript Objects ​  ​| ​  7960 |   8074 |   ​98.59% | 
-| 
-| Totals ​                                     |  11036 |  11572 |   ​95.37% | 
interpreter.1353053061.txt.gz · Last modified: 2015/02/02 08:24 (external edit)