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|
/*
* Start symbol
*/
LANGUAGE_DIRECTIVE: "#declare" "identifier" "=" RVALUE {
dmnsn_declare_symbol(symtable, $2, $4);
free($2);
dmnsn_delete_astnode($4);
}
| "#local" "identifier" "=" RVALUE {
dmnsn_local_symbol(symtable, $2, $4);
free($2);
dmnsn_delete_astnode($4);
}
| "#undef" "identifier" {
dmnsn_undef_symbol(symtable, $2);
free($2);
}
| "#if" "(" CONDITIONAL ")" {
dmnsn_astnode cond = dmnsn_eval($3, symtable);
dmnsn_delete_astnode($3);
if (cond.type == DMNSN_AST_NONE) {
dmnsn_delete_astnode(cond);
YYERROR;
}
dmnsn_local_symbol(symtable, "__cond__", cond);
dmnsn_delete_astnode(cond);
}
RVALUE: ARITH_EXPR ";" %dprec 2 {
$$ = dmnsn_eval($1, symtable);
dmnsn_delete_astnode($1);
if ($$.type == DMNSN_AST_NONE) {
dmnsn_delete_astnode($$);
YYERROR;
}
}
| COLOR ";" %dprec 1
| OBJECT
| TEXTURE
| PIGMENT
| FINISH
| CAMERA
| TRANSFORMATION
CONDITIONAL: ARITH_EXPR {
/* Force the expression to be evaluated logically */
dmnsn_astnode zero = dmnsn_new_astnode(DMNSN_AST_INTEGER, @$);
zero.ptr = malloc(sizeof(long));
if (!zero.ptr)
dmnsn_error(DMNSN_SEVERITY_HIGH,
"Failed to allocate room for integer.");
*(long *)zero.ptr = 0;
$$ = dmnsn_new_astnode2(DMNSN_AST_OR, @$, zero, $1);
}
| ARITH_EXPR "=" ARITH_EXPR {
$$ = dmnsn_new_astnode2(DMNSN_AST_EQUAL, @$, $1, $3);
}
| ARITH_EXPR "!=" ARITH_EXPR {
$$ = dmnsn_new_astnode2(DMNSN_AST_NOT_EQUAL, @$, $1, $3);
}
| ARITH_EXPR "<" ARITH_EXPR {
$$ = dmnsn_new_astnode2(DMNSN_AST_LESS, @$, $1, $3);
}
| ARITH_EXPR "<=" ARITH_EXPR {
$$ = dmnsn_new_astnode2(DMNSN_AST_LESS_EQUAL, @$, $1, $3);
}
| ARITH_EXPR ">" ARITH_EXPR {
$$ = dmnsn_new_astnode2(DMNSN_AST_GREATER, @$, $1, $3);
}
| ARITH_EXPR ">=" ARITH_EXPR {
$$ = dmnsn_new_astnode2(DMNSN_AST_GREATER_EQUAL, @$, $1, $3);
}
| CONDITIONAL "&" CONDITIONAL {
$$ = dmnsn_new_astnode2(DMNSN_AST_AND, @$, $1, $3);
}
| CONDITIONAL "|" CONDITIONAL {
$$ = dmnsn_new_astnode2(DMNSN_AST_OR, @$, $1, $3);
}
| "(" CONDITIONAL ")" {
$$ = $2;
}
|
