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step: add lispval wrapper.

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This commit is contained in:
NunoSempere 2023-04-30 12:13:10 -04:00
parent dcfa3c1c99
commit 77409407d9
2 changed files with 78 additions and 23 deletions
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mumble
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src/mumble.c
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@ -7,6 +7,79 @@
#include "mpc/mpc.h"
#define VERBOSE 1
// Types
typedef struct {
int type;
long num;
int err;
} lispval;
enum { LISPVAL_NUM, LISPVAL_ERR };
enum { LISPERR_DIV_ZERO, LISPERR_BAD_OP, LISPERR_BAD_NUM };
lispval lispval_num(long x){
lispval v;
v.type = LISPVAL_NUM;
v.num = x;
return v;
}
lispval lispval_err(int i){
lispval v;
v.type = LISPVAL_ERR;
v.err = i;
return v;
}
void print_lispval(lispval l){
switch(l.type){
case LISPVAL_NUM:
printf("%li", l.num);
break;
case LISPVAL_ERR:
switch(l.err){
case LISPERR_BAD_OP:
printf("Error: Invalid operator");
break;
case LISPERR_BAD_NUM:
printf("Error: Invalid number");
break;
case LISPERR_DIV_ZERO:
printf("Error: Division by zero");
break;
default:
printf("Error: Unknown error");
}
break;
default:
printf("Unknown lispval type");
}
printf("\n");
}
// Utils
int is_ignorable(mpc_ast_t* t){
int is_regex = !strcmp(t->tag, "regex");
int is_parenthesis = !strcmp(t->tag, "char") && !strcmp(t->contents, "(");
return is_regex || is_parenthesis;
}
void print_ast(mpc_ast_t* ast, int num_tabs)
{
char tabs[100] = "";
for(int i=0; i<num_tabs;i++){
strcat(tabs, " ");
}
printf("\n%sTag: %s", tabs, ast->tag);
printf("\n%sContents: %s", tabs, strcmp(ast->contents, "") ? ast->contents : "None");
printf("\n%sNumber of children: %i", tabs, ast->children_num);
/* Print the children */
for (int i = 0; i < ast->children_num; i++) {
mpc_ast_t* child_i = ast->children[i];
printf("\n%sChild #%d", tabs, i);
print_ast(child_i, 1);
}
}
// Operations
long evaluate_unary_operation(char* op, long x)
{
if (!strcmp(op, "+")) {
@ -30,11 +103,7 @@ long evaluate_operation(char* op, long x, long y)
return 0;
}
int is_ignorable(mpc_ast_t* t){
int is_regex = !strcmp(t->tag, "regex");
int is_parenthesis = !strcmp(t->tag, "char") && !strcmp(t->contents, "(");
return is_regex || is_parenthesis;
}
// Evaluate the AST
long evaluate_ast(mpc_ast_t* t)
{
// Base case #1: It's a number
@ -90,25 +159,10 @@ long evaluate_ast(mpc_ast_t* t)
return x;
}
void print_ast(mpc_ast_t* ast, int num_tabs)
{
char tabs[100] = "";
for(int i=0; i<num_tabs;i++){
strcat(tabs, " ");
}
printf("\n%sTag: %s", tabs, ast->tag);
printf("\n%sContents: %s", tabs, strcmp(ast->contents, "") ? ast->contents : "None");
printf("\n%sNumber of children: %i", tabs, ast->children_num);
/* Print the children */
for (int i = 0; i < ast->children_num; i++) {
mpc_ast_t* child_i = ast->children[i];
printf("\n%sChild #%d", tabs, i);
print_ast(child_i, 1);
}
}
// Main
int main(int argc, char** argv)
{
// Info
puts("Mumble version 0.0.2\n");
puts("Press Ctrl+C/Ctrl+D to exit\n");
@ -128,6 +182,8 @@ int main(int argc, char** argv)
",
Number, Operator, Expr, Mumble);
// Initialize a repl
int loop = 1;
while (loop) {
char* input = readline("mumble> ");
@ -155,7 +211,6 @@ int main(int argc, char** argv)
mpc_err_print(result.error);
mpc_err_delete(result.error);
}
// printf("Did you say \"%s\"?\n", input);
add_history(input);
// can't add if input is NULL
}