add an eval example (used by emscriptenduktest)

examples/eval/eval.c

@@ -0,0 +1,49 @@
+/*
+ *  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_INVALID_INDEX);
+		duk_safe_call(ctx, tostring_raw, 1 /*nargs*/, 1 /*nrets*/, DUK_INVALID_INDEX);
+		res = duk_get_string(ctx, -1);
+		printf("%s\n", res ? res : "null");
+		duk_pop(ctx);
+	}
+
+	duk_destroy_heap(ctx);
+
+	return 0;
+}
+

util/make_dist.sh

@@ -48,6 +48,7 @@ mkdir $DIST/src
 mkdir $DIST/licenses
 mkdir $DIST/examples
 mkdir $DIST/examples/hello
+mkdir $DIST/examples/eval
 mkdir $DIST/examples/cmdline
 mkdir $DIST/examples/guide
 mkdir $DIST/examples/coffee
@@ -186,6 +187,13 @@ for i in \
 	cp examples/hello/$i $DIST/examples/hello/
 done
 
+for i in \
+	eval.c \
+	; do
+	cp examples/eval/$i $DIST/examples/eval/
+done
+
+
 for i in \
 	fib.js \
 	process.js \