duktape-1.8.0/examples/eval/eval.c

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/*
 *  Very simple example program for evaluating expressions from
 *  command line
 */
 
#include "duktape.h"
#include <stdio.h>
 
static int eval_raw(duk_context *ctx) {
    duk_eval(ctx);
    return 1;
}
 
static int tostring_raw(duk_context *ctx) {
    duk_to_string(ctx, -1);
    return 1;
}
 
static void usage_exit(void) {
    fprintf(stderr, "Usage: eval <expression> [<expression>] ...\n");
    fflush(stderr);
    exit(1);
}
 
int main(int argc, char *argv[]) {
    duk_context *ctx;
    int i;
    const char *res;
 
    if (argc < 2) {
        usage_exit();
    }
 
    ctx = duk_create_heap_default();
    for (i = 1; i < argc; i++) {
        printf("=== eval: '%s' ===\n", argv[i]);
        duk_push_string(ctx, argv[i]);
        duk_safe_call(ctx, eval_raw, 1 /*nargs*/, 1 /*nrets*/);
        duk_safe_call(ctx, tostring_raw, 1 /*nargs*/, 1 /*nrets*/);
        res = duk_get_string(ctx, -1);
        printf("%s\n", res ? res : "null");
        duk_pop(ctx);
    }
 
    duk_destroy_heap(ctx);
 
    return 0;
}