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#include <stdio.h>
#include <stdlib.h>
#include <readline/readline.h>
#include <readline/history.h>
#include "lisp.h"
#include "lex.yy.h"
#include "lisp.tab.h"
env *global_env = NULL;
void eval_file(const char *filename) {
FILE *f = fopen(filename, "r");
if (!f) {
fprintf(stderr, "could not open file: %s\n", filename);
return;
}
char line[1024];
while (fgets(line, sizeof(line), f)) {
if (*line == '\n' || *line == ';') continue; // skip empty lines or comments
yy_scan_string(line);
yyparse();
}
fclose(f);
}
int main(int argc, char **argv) {
// init global env
global_env = env_create(NULL);
env_define(global_env, "cons", make_builtin(builtin_cons));
env_define(global_env, "car", make_builtin(builtin_car));
env_define(global_env, "cdr", make_builtin(builtin_cdr));
env_define(global_env, "null?", make_builtin(builtin_isnull));
env_define(global_env, "+", make_builtin(builtin_add));
env_define(global_env, "-", make_builtin(builtin_sub));
env_define(global_env, "*", make_builtin(builtin_mul));
env_define(global_env, "/", make_builtin(builtin_div));
env_define(global_env, "<=", make_builtin(builtin_le));
// evaluate files
for(int i = 1; i < argc; i++) {
eval_file(argv[i]);
}
// START REPL
char* line;
while ((line = readline("λ> ")) != NULL) {
if (*line) {
add_history(line);
}
yy_scan_string(line);
yyparse();
free(line);
}
return 0;
}
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