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-/*
- * Simple example of parsing and printing JSON using jansson.
- *
- * SYNOPSIS:
- * $ examples/simple_parse
- * Type some JSON > [true, false, null, 1, 0.0, -0.0, "", {"name": "barney"}]
- * JSON Array of 8 elements:
- * JSON True
- * JSON False
- * JSON Null
- * JSON Integer: "1"
- * JSON Real: 0.000000
- * JSON Real: -0.000000
- * JSON String: ""
- * JSON Object of 1 pair:
- * JSON Key: "name"
- * JSON String: "barney"
- *
- * Copyright (c) 2014 Robert Poor <rdpoor@gmail.com>
- *
- * Jansson is free software; you can redistribute it and/or modify
- * it under the terms of the MIT license. See LICENSE for details.
- */
-
-#include <jansson.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-/* forward refs */
-void print_json(json_t *root);
-void print_json_aux(json_t *element, int indent);
-void print_json_indent(int indent);
-const char *json_plural(size_t count);
-void print_json_object(json_t *element, int indent);
-void print_json_array(json_t *element, int indent);
-void print_json_string(json_t *element, int indent);
-void print_json_integer(json_t *element, int indent);
-void print_json_real(json_t *element, int indent);
-void print_json_true(json_t *element, int indent);
-void print_json_false(json_t *element, int indent);
-void print_json_null(json_t *element, int indent);
-
-void print_json(json_t *root) { print_json_aux(root, 0); }
-
-void print_json_aux(json_t *element, int indent) {
- switch (json_typeof(element)) {
- case JSON_OBJECT:
- print_json_object(element, indent);
- break;
- case JSON_ARRAY:
- print_json_array(element, indent);
- break;
- case JSON_STRING:
- print_json_string(element, indent);
- break;
- case JSON_INTEGER:
- print_json_integer(element, indent);
- break;
- case JSON_REAL:
- print_json_real(element, indent);
- break;
- case JSON_TRUE:
- print_json_true(element, indent);
- break;
- case JSON_FALSE:
- print_json_false(element, indent);
- break;
- case JSON_NULL:
- print_json_null(element, indent);
- break;
- default:
- fprintf(stderr, "unrecognized JSON type %d\n", json_typeof(element));
- }
-}
-
-void print_json_indent(int indent) {
- int i;
- for (i = 0; i < indent; i++) {
- putchar(' ');
- }
-}
-
-const char *json_plural(size_t count) { return count == 1 ? "" : "s"; }
-
-void print_json_object(json_t *element, int indent) {
- size_t size;
- const char *key;
- json_t *value;
-
- print_json_indent(indent);
- size = json_object_size(element);
-
- printf("JSON Object of %lld pair%s:\n", (long long)size, json_plural(size));
- json_object_foreach(element, key, value) {
- print_json_indent(indent + 2);
- printf("JSON Key: \"%s\"\n", key);
- print_json_aux(value, indent + 2);
- }
-}
-
-void print_json_array(json_t *element, int indent) {
- size_t i;
- size_t size = json_array_size(element);
- print_json_indent(indent);
-
- printf("JSON Array of %lld element%s:\n", (long long)size, json_plural(size));
- for (i = 0; i < size; i++) {
- print_json_aux(json_array_get(element, i), indent + 2);
- }
-}
-
-void print_json_string(json_t *element, int indent) {
- print_json_indent(indent);
- printf("JSON String: \"%s\"\n", json_string_value(element));
-}
-
-void print_json_integer(json_t *element, int indent) {
- print_json_indent(indent);
- printf("JSON Integer: \"%" JSON_INTEGER_FORMAT "\"\n", json_integer_value(element));
-}
-
-void print_json_real(json_t *element, int indent) {
- print_json_indent(indent);
- printf("JSON Real: %f\n", json_real_value(element));
-}
-
-void print_json_true(json_t *element, int indent) {
- (void)element;
- print_json_indent(indent);
- printf("JSON True\n");
-}
-
-void print_json_false(json_t *element, int indent) {
- (void)element;
- print_json_indent(indent);
- printf("JSON False\n");
-}
-
-void print_json_null(json_t *element, int indent) {
- (void)element;
- print_json_indent(indent);
- printf("JSON Null\n");
-}
-
-/*
- * Parse text into a JSON object. If text is valid JSON, returns a
- * json_t structure, otherwise prints and error and returns null.
- */
-json_t *load_json(const char *text) {
- json_t *root;
- json_error_t error;
-
- root = json_loads(text, 0, &error);
-
- if (root) {
- return root;
- } else {
- fprintf(stderr, "json error on line %d: %s\n", error.line, error.text);
- return (json_t *)0;
- }
-}
-
-/*
- * Print a prompt and return (by reference) a null-terminated line of
- * text. Returns NULL on eof or some error.
- */
-char *read_line(char *line, int max_chars) {
- printf("Type some JSON > ");
- fflush(stdout);
- return fgets(line, max_chars, stdin);
-}
-
-/* ================================================================
- * main
- */
-
-#define MAX_CHARS 4096
-
-int main(int argc, char *argv[]) {
- char line[MAX_CHARS];
-
- if (argc != 1) {
- fprintf(stderr, "Usage: %s\n", argv[0]);
- exit(-1);
- }
-
- while (read_line(line, MAX_CHARS) != (char *)NULL) {
-
- /* parse text into JSON structure */
- json_t *root = load_json(line);
-
- if (root) {
- /* print and release the JSON structure */
- print_json(root);
- json_decref(root);
- }
- }
-
- return 0;
-}