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Diffstat (limited to 'fluent-bit/lib/jansson-e23f558/examples/simple_parse.c')
| -rw-r--r-- | fluent-bit/lib/jansson-e23f558/examples/simple_parse.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/fluent-bit/lib/jansson-e23f558/examples/simple_parse.c b/fluent-bit/lib/jansson-e23f558/examples/simple_parse.c new file mode 100644 index 000000000..a96a0f831 --- /dev/null +++ b/fluent-bit/lib/jansson-e23f558/examples/simple_parse.c @@ -0,0 +1,200 @@ +/* + * 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; +} |