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Overview
| Comment: | Added test for a simple arithmetic parser. This test is not fully functional, because the generated parser is not tested. |
|---|---|
| Timelines: | family | ancestors | trunk |
| Files: | files | file ages | folders |
| SHA1: |
a13decd30ff28da79b4319a6ee05fcec |
| User & Date: | wolf 2009-09-18 08:02:55.000 |
Context
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2009-09-18
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| 08:02 | Added test for a simple arithmetic parser. This test is not fully functional, because the generated parser is not tested. Leaf check-in: a13decd30f user: wolf tags: trunk | |
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2009-09-05
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| 20:06 | Added tests for ifdef / ifndef special directive and forgot to commit test description for fallback special directive. check-in: 6ba26bfaf5 user: wolf tags: trunk | |
Changes
Added test/simple_arithmetic.py.
> > > | 1 2 3 | output="" return_code=0 grammar='simple_arithmetic.y' |
Added test_grammar/simple_arithmetic.y.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 |
// Set the token type to be of type int
%token_type int
/* This is expression which we are trying to evaluate.
* Nonterminals start with a lowercase letter and are
* written conventionaly all lowercase.
* Each production stops with a dot.
* After each production there may be an embedded block
* of C Code, which will be executed once the expression
* was red.
*/
start::= expr(EXP_VALUE). { printf("result=%i\n",EXP_VALUE); }
// Note how we can assign letters like A,B and C
// for the values of expressions and use them in C code.
expr(A) ::= expr(B) PLUS expr(C). { A=B+C;}
expr(A) ::= expr(B) TIMES expr(C). { A=B*C;}
expr(A)::= expr(B) MINUS expr(C). { A=B-C;}
expr(A)::= expr(B) DIVIDE expr(C). { A=B/C;}
// Terminals all start with an uppercase first letter and usually
// are written all upercase.
expr(A) ::= LPAREN expr(B) RPAREN. { A=B;}
expr(A) ::= NUMBER(NUM_VALUE). { A=NUM_VALUE;}
// This makes the operators left associative.
%left PLUS MINUS.
// The order is important: TIMES and DIVIDE get higher precedence than PLUS MINUS,
// because they are below.
%left TIMES DIVIDE.
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