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Added division.

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This commit is contained in:
Jacob Signorovitch 2024-12-28 18:39:33 -05:00
parent a57acc1176
commit b4cd46a1e7
4 changed files with 31 additions and 19 deletions
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5
src/exec.c
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@ -37,6 +37,11 @@ ASTNumData exec_call(AST* ast) {
ASTNumData n2 = exec_expr(calldata->argv[1]);
return n1 * n2;
} else if (!strcmp(calldata->to, "/") && calldata->argc == 2) {
ASTNumData n1 = exec_expr(calldata->argv[0]);
ASTNumData n2 = exec_expr(calldata->argv[1]);
return n1 / n2;
}
return -1000;
}

25
src/grammar.y
View File

@ -27,6 +27,7 @@
%token NEG
%token PLUS
%token MULT
%token DIV
%token NL
%type<ast> exp
@ -91,4 +92,28 @@ exp:
$$ = ast_init(AST_TYPE_CALL, ast_call_data_init("*", 2, argv));
}
| NUM DIV NUM {
AST** argv = calloc(2, sizeof(AST*));
argv[0] = ast_init(AST_TYPE_NUM, ast_num_data_init($1));
argv[1] = ast_init(AST_TYPE_NUM, ast_num_data_init($3));
$$ = ast_init(AST_TYPE_CALL, ast_call_data_init("/", 2, argv));
}
| NEG NUM DIV NUM {
AST** argv = calloc(2, sizeof(AST*));
argv[0] = ast_init(AST_TYPE_NUM, ast_num_data_init(-$2));
argv[1] = ast_init(AST_TYPE_NUM, ast_num_data_init($4));
$$ = ast_init(AST_TYPE_CALL, ast_call_data_init("/", 2, argv));
}
| NEG NUM DIV NEG NUM {
AST** argv = calloc(2, sizeof(AST*));
argv[0] = ast_init(AST_TYPE_NUM, ast_num_data_init(-$2));
argv[1] = ast_init(AST_TYPE_NUM, ast_num_data_init(-$5));
$$ = ast_init(AST_TYPE_CALL, ast_call_data_init("/", 2, argv));
}
| NUM DIV NEG NUM {
AST** argv = calloc(2, sizeof(AST*));
argv[0] = ast_init(AST_TYPE_NUM, ast_num_data_init($1));
argv[1] = ast_init(AST_TYPE_NUM, ast_num_data_init(-$4));
$$ = ast_init(AST_TYPE_CALL, ast_call_data_init("/", 2, argv));
}
%%

9
src/include/lexer.h
View File

@ -3,16 +3,7 @@
#include <assert.h>
#ifdef __has_include
#if __has_include("../../build/grammars/grammar.tab.h")
#include "../../build/grammars/grammar.tab.h"
#else
#warn "Build resources not present!"
#endif
#else
#warn "Not sure whether build-time resources are present."
#include "../../build/grammars/grammar.tab.h"
#endif
extern YYSTYPE yylval;
extern char* inp;

11
src/lexer.c
View File

@ -28,22 +28,12 @@ double acc_float(int c) {
inp++;
while (isdigit(*inp)) {
// TODO:
// Accumulate as int, divide once at end.
// value = value + (((double)(*inp - '0'))/pow(10.0l,
// (double)(inp-oinp))); // Accumulate value.
value = value * 10 + (*inp - '0'); // Accumulate value.
dplaces++;
inp++;
}
value = value / pow(10, dplaces);
}
// > 1.20000
// = 1.0 + 2/10
// > 1.23
// = 1.2 + 3/100
return value;
}
@ -67,6 +57,7 @@ int yylex() {
case '\n': return NL;
case '-': return NEG;
case '*': return MULT;
case '/': return DIV;
default: return CALL;
}