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pegjs/examples/arithmetics.pegjs

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Simplified the example arithmetics grammar once more + addded comment.
2010-03-14 18:46:53 +01:00
/*
* Classic example grammar, which recognizes simple arithmetic expressions like
* "2*(3+4)". The parser generated from this grammar then computes their value.
*/
Initial commit.
2010-03-07 20:41:02 +01:00
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
2010-05-23 15:56:57 +02:00
start
= additive
Initial commit.
2010-03-07 20:41:02 +01:00
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
2010-05-23 15:56:57 +02:00
additive
Use labeled expressions and variables instead of $1, $2, etc. Labeled expressions lead to more maintainable code and also will allow certain optimizations (we can ignore results of expressions not passed to the actions). This does not speed up the benchmark suite execution statistically significantly on V8. Detailed results (benchmark suite totals): --------------------------------- Test # Before After --------------------------------- 1 28.43 kB/s 28.46 kB/s 2 28.38 kB/s 28.56 kB/s 3 28.22 kB/s 28.58 kB/s 4 28.76 kB/s 28.55 kB/s 5 28.57 kB/s 28.48 kB/s --------------------------------- Average 28.47 kB/s 28.53 kB/s --------------------------------- Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4
2010-05-31 12:40:24 +02:00
= left:multiplicative "+" right:additive { return left + right; }
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
2010-05-23 15:56:57 +02:00
/ multiplicative
Initial commit.
2010-03-07 20:41:02 +01:00
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
2010-05-23 15:56:57 +02:00
multiplicative
Use labeled expressions and variables instead of $1, $2, etc. Labeled expressions lead to more maintainable code and also will allow certain optimizations (we can ignore results of expressions not passed to the actions). This does not speed up the benchmark suite execution statistically significantly on V8. Detailed results (benchmark suite totals): --------------------------------- Test # Before After --------------------------------- 1 28.43 kB/s 28.46 kB/s 2 28.38 kB/s 28.56 kB/s 3 28.22 kB/s 28.58 kB/s 4 28.76 kB/s 28.55 kB/s 5 28.57 kB/s 28.48 kB/s --------------------------------- Average 28.47 kB/s 28.53 kB/s --------------------------------- Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4
2010-05-31 12:40:24 +02:00
= left:primary "*" right:multiplicative { return left * right; }
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
2010-05-23 15:56:57 +02:00
/ primary
Initial commit.
2010-03-07 20:41:02 +01:00
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
2010-05-23 15:56:57 +02:00
primary
= integer
Use labeled expressions and variables instead of $1, $2, etc. Labeled expressions lead to more maintainable code and also will allow certain optimizations (we can ignore results of expressions not passed to the actions). This does not speed up the benchmark suite execution statistically significantly on V8. Detailed results (benchmark suite totals): --------------------------------- Test # Before After --------------------------------- 1 28.43 kB/s 28.46 kB/s 2 28.38 kB/s 28.56 kB/s 3 28.22 kB/s 28.58 kB/s 4 28.76 kB/s 28.55 kB/s 5 28.57 kB/s 28.48 kB/s --------------------------------- Average 28.47 kB/s 28.53 kB/s --------------------------------- Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4
2010-05-31 12:40:24 +02:00
/ "(" additive:additive ")" { return additive; }
Initial commit.
2010-03-07 20:41:02 +01:00
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
2010-05-23 15:56:57 +02:00
integer "integer"
Text nodes: Use text nodes in examples/arithmetics.pegjs
2012-12-01 16:29:41 +01:00
= digits:$[0-9]+ { return parseInt(digits, 10); }
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