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