examples: add example code for json_script.

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

examples/CMakeLists.txt

@@ -17,3 +17,5 @@ TARGET_LINK_LIBRARIES(ustream-example ubox)
 ADD_EXECUTABLE(runqueue-example runqueue-example.c)
 TARGET_LINK_LIBRARIES(runqueue-example ubox)
 
+ADD_EXECUTABLE(json_script-example json_script-example.c)
+TARGET_LINK_LIBRARIES(json_script-example ubox blobmsg_json json_script ${json})

examples/json_script-example.c

@@ -0,0 +1,84 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <json.h>
+#include "blobmsg.h"
+#include "blobmsg_json.h"
+#include "json_script.h"
+
+struct json_script_ctx	jctx;
+struct blob_buf 	b_vars;
+struct blob_buf 	b_script;
+
+static void handle_command(struct json_script_ctx *ctx, const char *name,
+	struct blob_attr *data, struct blob_attr *vars)
+{
+	struct blob_attr *cur;
+	int rem;
+
+	fprintf(stderr, "Command: %s", name);
+	blobmsg_for_each_attr(cur, data, rem)
+		fprintf(stderr, " %s", (char *) blobmsg_data(cur));
+	fprintf(stderr, "\n");
+}
+
+static struct json_script_file *
+handle_file(struct json_script_ctx *ctx, const char *filename)
+{
+	json_object *obj;
+
+	obj = json_object_from_file(filename);
+	if (!obj) {
+		fprintf(stderr, "load JSON data from %s failed.\n", filename);
+		return NULL;
+	}
+
+	blob_buf_init(&b_script, 0);
+	blobmsg_add_json_element(&b_script, "", obj);
+	json_object_put(obj);
+
+	return json_script_file_from_blobmsg(filename,
+		blob_data(b_script.head), blob_len(b_script.head));
+}
+
+static void usage(const char *prog, int exit_code)
+{
+	fprintf(stderr, "Usage: %s [VARNAME=value] <filename_json_script>\n", prog);
+	exit(exit_code);
+}
+
+int main(int argc, char *argv[])
+{
+	int i;
+	char *file = NULL;
+	const char *prog = argv[0];
+
+	blobmsg_buf_init(&b_vars);
+	blobmsg_buf_init(&b_script);
+
+	json_script_init(&jctx);
+	jctx.handle_command = handle_command;
+	jctx.handle_file = handle_file;
+
+	for (i = 1; i < argc; i++) {
+		char *sep = strchr(argv[i], '=');
+		if (sep) {
+			*sep = '\0';
+			blobmsg_add_string(&b_vars, argv[i], sep + 1);
+		} else if (!file) {
+			file = argv[i];
+		} else {
+			usage(prog, -1);
+		}
+	}
+	if (i < argc || !file)
+		usage(prog, -2);
+
+	json_script_run(&jctx, file, b_vars.head);
+
+	json_script_free(&jctx);
+	blob_buf_free(&b_script);
+	blob_buf_free(&b_vars);
+
+	return 0;
+}

examples/json_script-example.json

@@ -0,0 +1,33 @@
+[
+  [ "exec", "%EXECVAR%", "/%%/" ],
+  [ "if",
+    [ "eq", "EQVAR", "eqval" ],
+    [ "exec_if", "%VAR%", "%%", "jk" ]
+  ],
+  [ "case", "CASEVAR", {
+    "caseval0": ["cmd_case_0", "cmd_case_arg0", "case_cmd_arg1"],
+    "caseval1": ["cmd_case_1", "cmd_case_arg0", "case_cmd_arg1"]
+  } ],
+
+  [ "if",
+    [ "and", [ "eq", "EQVAR", "eqval" ],
+             [ "has", "HASVAR" ],
+             [ "regex", "REGEXVAR0", "regexval" ],
+             [ "regex", "REGEXVAR1", [ "regexval10", "regexval11" ] ],
+             [ "not", [ "eq", "NOTEQVAR", "noteqval" ] ] ],
+    [ "exec_if_and", "%ANDVAR%" ]
+  ],
+
+  [ "if",
+    [ "or", [ "eq", "EQVAR", "eqval" ],
+            [ "has", "HASVAR" ],
+            [ "regex", "REGEXVAR0", "regexval" ],
+            [ "regex", "REGEXVAR1", [ "regexval10", "regexval11" ] ],
+            [ "not", [ "eq", "NOTEQVAR", "noteqval" ] ] ],
+    [ "exec_if_or", "%ORVAR%" ]
+  ],
+
+  [ "return", "foobar" ],
+
+  [ "exec_non_reachable", "Arghhh" ]
+]