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pegjs/examples/arithmetics.pegjs

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Simplified the example arithmetics grammar once more + addded comment.
15 years ago
/*
* Classic example grammar, which recognizes simple arithmetic expressions like
* "2*(3+4)". The parser generated from this grammar then computes their value.
*/
Initial commit.
15 years ago
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
15 years ago
start
= additive
Initial commit.
15 years ago
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
15 years ago
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
15 years ago
= left:multiplicative "+" right:additive { return left + right; }
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
15 years ago
/ multiplicative
Initial commit.
15 years ago
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
15 years ago
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
15 years ago
= left:primary "*" right:multiplicative { return left * right; }
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
15 years ago
/ primary
Initial commit.
15 years ago
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
15 years ago
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
15 years ago
/ "(" additive:additive ")" { return additive; }
Initial commit.
15 years ago
Formatted all grammars more consistently and transparently This is purely cosmetical change, no functionality was affected (hopefully).
15 years ago
integer "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
15 years ago
= digits:[0-9]+ { return parseInt(digits.join(""), 10); }