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repl.c
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repl.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <ctype.h>
#include <signal.h>
#include <unistd.h>
#include "ant.h"
#include "repl.h"
#include "config.h"
#include "runtime.h"
#include "modules/io.h"
#define MAX_HISTORY 100
#define MAX_LINE_LENGTH 4096
static volatile sig_atomic_t ctrl_c_pressed = 0;
typedef struct {
char **lines;
int count;
int capacity;
int current;
} history_t;
static void sigint_handler(int sig) {
(void)sig;
ctrl_c_pressed++;
}
static void history_init(history_t *hist) {
hist->capacity = MAX_HISTORY;
hist->lines = malloc(sizeof(char*) * hist->capacity);
hist->count = 0;
hist->current = -1;
}
static void history_add(history_t *hist, const char *line) {
if (strlen(line) == 0) return;
if (hist->count > 0 && strcmp(hist->lines[hist->count - 1], line) == 0) return;
if (hist->count >= hist->capacity) {
free(hist->lines[0]);
memmove(hist->lines, hist->lines + 1, sizeof(char*) * (hist->capacity - 1));
hist->count--;
}
hist->lines[hist->count++] = strdup(line);
hist->current = hist->count;
}
static const char* history_prev(history_t *hist) {
if (hist->count == 0) return NULL;
if (hist->current > 0) hist->current--;
return hist->lines[hist->current];
}
static const char* history_next(history_t *hist) {
if (hist->count == 0) return NULL;
if (hist->current < hist->count - 1) {
hist->current++;
return hist->lines[hist->current];
}
hist->current = hist->count;
return "";
}
static void history_free(history_t *hist) {
for (int i = 0; i < hist->count; i++) free(hist->lines[i]);
free(hist->lines);
}
static char* read_line_with_history(history_t *hist, struct js *js) {
static struct termios old_tio, new_tio;
char *line = malloc(MAX_LINE_LENGTH);
int pos = 0;
int len = 0;
line[0] = '\0';
tcgetattr(STDIN_FILENO, &old_tio);
new_tio = old_tio;
new_tio.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &new_tio);
while (1) {
if (ctrl_c_pressed > 0) {
printf("\n");
fflush(stdout);
tcsetattr(STDIN_FILENO, TCSANOW, &old_tio);
free(line);
return NULL;
}
int c = getchar();
if (c == EOF) {
if (ctrl_c_pressed > 0) {
printf("\n");
fflush(stdout);
tcsetattr(STDIN_FILENO, TCSANOW, &old_tio);
free(line);
return NULL;
}
tcsetattr(STDIN_FILENO, TCSANOW, &old_tio);
free(line);
return NULL;
}
if (c == 27) {
int next1 = getchar();
if (next1 == '[') {
int next2 = getchar();
if (next2 == 'A') {
const char *prev = history_prev(hist);
if (prev) {
printf("\r\033[K> ");
fflush(stdout);
strcpy(line, prev);
len = strlen(line);
pos = len;
printf("%s", line);
fflush(stdout);
}
continue;
} else if (next2 == 'B') {
const char *next = history_next(hist);
if (next) {
printf("\r\033[K> ");
fflush(stdout);
strcpy(line, next);
len = strlen(line);
pos = len;
printf("%s", line);
fflush(stdout);
}
continue;
} else if (next2 == 'C') {
if (pos < len) {
printf("\033[C");
fflush(stdout);
pos++;
}
continue;
} else if (next2 == 'D') {
if (pos > 0) {
printf("\033[D");
fflush(stdout);
pos--;
}
continue;
}
}
continue;
}
if (c == 127 || c == 8) {
if (pos > 0) {
memmove(line + pos - 1, line + pos, len - pos + 1);
pos--;
len--;
printf("\b\033[K%s", line + pos);
for (int i = 0; i < len - pos; i++) printf("\033[D");
fflush(stdout);
}
continue;
}
if (c == '\n' || c == '\r') {
printf("\n");
fflush(stdout);
tcsetattr(STDIN_FILENO, TCSANOW, &old_tio);
line[len] = '\0';
return line;
}
if (isprint(c) && len < MAX_LINE_LENGTH - 1) {
memmove(line + pos + 1, line + pos, len - pos + 1);
line[pos] = c;
pos++;
len++;
printf("%c%s", c, line + pos);
for (int i = 0; i < len - pos; i++) printf("\033[D");
fflush(stdout);
}
}
}
void ant_repl_run() {
struct js *js = rt->js;
js_set_filename(js, "[repl]");
js_setup_import_meta(js, "[repl]");
js_mkscope(js);
printf("Welcome to Ant JavaScript v%s\n", ANT_VERSION);
printf("Type \".help\" for more information.\n");
struct sigaction sa;
sa.sa_handler = sigint_handler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sigaction(SIGINT, &sa, NULL);
history_t history;
history_init(&history);
js_set(js, js_glob(js), "__dirname", js_mkstr(js, ".", 1));
js_set(js, js_glob(js), "__filename", js_mkstr(js, "[repl]", 6));
int prev_ctrl_c_count = 0;
while (1) {
printf("> ");
fflush(stdout);
ctrl_c_pressed = 0;
char *line = read_line_with_history(&history, js);
if (ctrl_c_pressed > 0) {
if (prev_ctrl_c_count > 0) {
printf("\n");
if (line) free(line);
break;
}
printf("(To exit, press Ctrl+C again or type .exit)\n");
prev_ctrl_c_count++;
if (line) free(line);
continue;
}
if (line == NULL) break;
prev_ctrl_c_count = 0;
size_t line_len = strlen(line);
if (line_len == 0) {
free(line);
continue;
}
history_add(&history, line);
if (line[0] == '.') {
if (strcmp(line, ".help") == 0) {
printf(" .help - Show this help message\n");
printf(" .exit - Exit the REPL\n");
printf(" .clear - Clear the current context\n");
printf(" .load - Load JS from a file into the REPL session\n");
printf(" .save - Save all evaluated commands in this REPL session to a file\n");
printf(" .gc - Run garbage collector\n");
printf(" .stats - Show memory statistics\n");
printf("\nPress Ctrl+C to abort current expression.\n");
} else if (strcmp(line, ".exit") == 0) {
free(line);
break;
} else if (strcmp(line, ".clear") == 0) {
printf("Clearing context...\n");
} else if (strncmp(line, ".load", 5) == 0) {
const char *filename = line + 5;
while (*filename == ' ') filename++;
if (*filename == '\0') {
fprintf(stderr, "Usage: .load <filename>\n");
} else {
FILE *fp = fopen(filename, "r");
if (fp == NULL) {
fprintf(stderr, "Failed to open file: %s\n", filename);
} else {
fseek(fp, 0, SEEK_END);
long file_size = ftell(fp);
fseek(fp, 0, SEEK_SET);
char *file_buffer = malloc(file_size + 1);
if (file_buffer) {
size_t len = fread(file_buffer, 1, file_size, fp);
file_buffer[len] = '\0';
jsval_t result = js_eval(js, file_buffer, len);
if (js_type(result) == JS_ERR) {
fprintf(stderr, "%s\n", js_str(js, result));
} else if (js_type(result) != JS_UNDEF) {
printf("%s\n", js_str(js, result));
}
free(file_buffer);
}
fclose(fp);
}
}
} else if (strncmp(line, ".save", 5) == 0) {
const char *filename = line + 5;
while (*filename == ' ') filename++;
if (*filename == '\0') {
fprintf(stderr, "Usage: .save <filename>\n");
} else {
FILE *fp = fopen(filename, "w");
if (fp == NULL) {
fprintf(stderr, "Failed to open file for writing: %s\n", filename);
} else {
for (int i = 0; i < history.count; i++) fprintf(fp, "%s\n", history.lines[i]);
fclose(fp);
printf("Session saved to %s\n", filename);
}
}
} else if (strcmp(line, ".gc") == 0) {
printf("Garbage collection complete\n");
} else if (strcmp(line, ".stats") == 0) {
size_t total, min, cstack;
js_stats(js, &total, &min, &cstack);
printf("Memory stats:\n");
printf(" Total: %zu bytes\n", total);
printf(" Free: %zu bytes\n", min);
printf(" C Stack: %zu bytes\n", cstack);
} else {
printf("Unknown command: %s\n", line);
printf("Type \".help\" for more information.\n");
}
free(line);
continue;
}
jsval_t eval_result = js_eval(js, line, line_len);
if (js_type(eval_result) == JS_ERR) fprintf(stderr, "%s\n", js_str(js, eval_result)); else {
const char *str = js_str(js, eval_result);
print_value_colored(str, stdout);
printf("\n");
}
free(line);
}
history_free(&history);
}

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