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| author | Tavian Barnes <tavianator@gmail.com> | 2009-11-24 09:43:19 -0500 |
|---|---|---|
| committer | Tavian Barnes <tavianator@gmail.com> | 2009-11-24 09:43:19 -0500 |
| commit | 810901c1c0f6bbfade2e4d7f3717eed19d166aa8 (patch) | |
| tree | 1740c7eb962976e35c563080e20d6fdff092e375 | |
| parent | 215d27185092f5a72faf3bfdcf843ece0d985992 (diff) | |
| download | dimension-810901c1c0f6bbfade2e4d7f3717eed19d166aa8.tar.xz | |
Use associative operators in grammar.
| -rw-r--r-- | dimension/grammar.y | 55 |
1 files changed, 25 insertions, 30 deletions
diff --git a/dimension/grammar.y b/dimension/grammar.y index 426bc29..12b9344 100644 --- a/dimension/grammar.y +++ b/dimension/grammar.y @@ -193,6 +193,15 @@ yyerror(YYLTYPE *locp, dmnsn_array *astree, dmnsn_token_iterator *iterator, %token DMNSN_T_GREATER_EQUAL ">=" %token DMNSN_T_NOT_EQUAL "!=" +/* Operators */ +%left "&" +%left "|" +%left "==" "!=" +%left "<" "<=" ">" ">=" +%left "+" "-" +%left "*" "/" +%left DMNSN_T_NEGATE + /* Numeric values */ %token <value> DMNSN_T_INTEGER "integer" %token <value> DMNSN_T_FLOAT "float" @@ -671,8 +680,7 @@ yyerror(YYLTYPE *locp, dmnsn_array *astree, dmnsn_token_iterator *iterator, /* Floats */ %type <astnode> FLOAT -%type <astnode> FLOAT_TERM -%type <astnode> FLOAT_FACTOR +%type <astnode> FLOAT_EXPR %type <astnode> FLOAT_LITERAL /* Vectors */ @@ -715,42 +723,30 @@ SPHERE: "sphere" "{" } ; -FLOAT: FLOAT_TERM - { +FLOAT: FLOAT_EXPR { $$ = dmnsn_eval_scalar($1); dmnsn_delete_astnode($1); } - | FLOAT "+" FLOAT_TERM - { - dmnsn_astnode sum = dmnsn_new_astnode2(DMNSN_AST_ADD, @$, $1, $3); - $$ = dmnsn_eval_scalar(sum); - dmnsn_delete_astnode(sum); - } - | FLOAT "-" FLOAT_TERM - { - dmnsn_astnode diff = dmnsn_new_astnode2(DMNSN_AST_SUB, @$, $1, $3); - $$ = dmnsn_eval_scalar(diff); - dmnsn_delete_astnode(diff); - } -; -FLOAT_TERM: FLOAT_FACTOR - | FLOAT_TERM "*" FLOAT_FACTOR - { +FLOAT_EXPR: FLOAT_LITERAL + | FLOAT_EXPR "+" FLOAT_EXPR { + $$ = dmnsn_new_astnode2(DMNSN_AST_ADD, @$, $1, $3); + } + | FLOAT_EXPR "-" FLOAT_EXPR { + $$ = dmnsn_new_astnode2(DMNSN_AST_SUB, @$, $1, $3); + } + | FLOAT_EXPR "*" FLOAT_EXPR { $$ = dmnsn_new_astnode2(DMNSN_AST_MUL, @$, $1, $3); } - | FLOAT_TERM "/" FLOAT_FACTOR - { + | FLOAT_EXPR "/" FLOAT_EXPR { $$ = dmnsn_new_astnode2(DMNSN_AST_DIV, @$, $1, $3); } - -FLOAT_FACTOR: FLOAT_LITERAL - | "+" FLOAT_FACTOR { $$ = $2; } - | "-" FLOAT_FACTOR - { + | "+" FLOAT_EXPR %prec DMNSN_T_NEGATE { $$ = $2; } + | "-" FLOAT_EXPR %prec DMNSN_T_NEGATE { $$ = dmnsn_new_astnode1(DMNSN_AST_NEGATE, @$, $2); } - | "(" FLOAT ")" { $$ = $2; } + | "(" FLOAT_EXPR ")" { $$ = $2; } +; FLOAT_LITERAL: "integer" { @@ -777,8 +773,7 @@ FLOAT_LITERAL: "integer" VECTOR: VECTOR_LITERAL ; -VECTOR_LITERAL: "<" FLOAT "," FLOAT "," FLOAT ">" - { +VECTOR_LITERAL: "<" FLOAT "," FLOAT "," FLOAT ">" { $$ = dmnsn_new_astnode3(DMNSN_AST_VECTOR, @$, $2, $4, $6); } ; |