Commit 2cb9b209 authored by Marek Vavruša's avatar Marek Vavruša

contrib: added ccan/json (BSD-MIT)

parent 48ff7597
../../licenses/BSD-MIT
\ No newline at end of file
#include "config.h"
#include <stdio.h>
#include <string.h>
/**
* json - Parse and generate JSON (JavaScript Object Notation)
*
* This is a library for encoding and decoding JSON that strives to be
* easy to learn, use, and incorporate into an application.
*
* JSON (JavaScript Object Notation) facilitates passing data among different
* programming languages, particularly JavaScript. It looks like this:
*
* [
* {
* "id": 1,
* "firstname": "John",
* "lastname": "Smith",
* "email": "john@example.com",
* "likes_pizza": false
* },
* {
* "id": 2,
* "firstname": "Linda",
* "lastname": "Jones",
* "email": null,
* "likes_pizza": true
* }
* ]
*
* Example:
* #include <ccan/json/json.h>
* #include <math.h>
* #include <stdio.h>
* #include <stdlib.h>
*
* static int find_number(JsonNode *object, const char *name, double *out)
* {
* JsonNode *node = json_find_member(object, name);
* if (node && node->tag == JSON_NUMBER) {
* *out = node->number_;
* return 1;
* }
* return 0;
* }
*
* static void solve_pythagorean(JsonNode *triple)
* {
* double a = 0, b = 0, c = 0;
* int a_given, b_given, c_given;
*
* if (triple->tag != JSON_OBJECT) {
* fprintf(stderr, "Error: Expected a JSON object.\n");
* exit(EXIT_FAILURE);
* }
*
* a_given = find_number(triple, "a", &a);
* b_given = find_number(triple, "b", &b);
* c_given = find_number(triple, "c", &c);
*
* if (a_given + b_given + c_given != 2) {
* fprintf(stderr, "Error: I need two sides to compute the length of the third.\n");
* exit(EXIT_FAILURE);
* }
*
* if (a_given && b_given) {
* c = sqrt(a*a + b*b);
* json_append_member(triple, "c", json_mknumber(c));
* } else if (a_given && c_given) {
* b = sqrt(c*c - a*a);
* json_append_member(triple, "b", json_mknumber(b));
* } else if (b_given && c_given) {
* a = sqrt(c*c - b*b);
* json_append_member(triple, "a", json_mknumber(a));
* }
* }
*
* int main(void)
* {
* JsonNode *triples = json_mkarray();
*
* json_append_element(triples, json_decode("{\"a\": 3, \"b\": 4}"));
* json_append_element(triples, json_decode("{\"a\": 5, \"c\": 13}"));
* json_append_element(triples, json_decode("{\"b\": 24, \"c\": 25}"));
*
* JsonNode *triple;
* json_foreach(triple, triples)
* solve_pythagorean(triple);
*
* char *tmp = json_stringify(triples, "\t");
* puts(tmp);
* free(tmp);
*
* json_delete(triples);
* return 0;
* }
*
* Author: Joey Adams
* Version: 0.1
* License: MIT
*/
int main(int argc, char *argv[])
{
/* Expect exactly one argument */
if (argc != 2)
return 1;
if (strcmp(argv[1], "depends") == 0) {
/* Nothing */
return 0;
}
if (strcmp(argv[1], "libs") == 0) {
printf("m\n"); /* Needed for sqrt() used in example code above. */
return 0;
}
return 1;
}
This diff is collapsed.
/*
Copyright (C) 2011 Joseph A. Adams (joeyadams3.14159@gmail.com)
All rights reserved.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#ifndef CCAN_JSON_H
#define CCAN_JSON_H
#include <stdbool.h>
#include <stddef.h>
typedef enum {
JSON_NULL,
JSON_BOOL,
JSON_STRING,
JSON_NUMBER,
JSON_ARRAY,
JSON_OBJECT,
} JsonTag;
typedef struct JsonNode JsonNode;
struct JsonNode
{
/* only if parent is an object or array (NULL otherwise) */
JsonNode *parent;
JsonNode *prev, *next;
/* only if parent is an object (NULL otherwise) */
char *key; /* Must be valid UTF-8. */
JsonTag tag;
union {
/* JSON_BOOL */
bool bool_;
/* JSON_STRING */
char *string_; /* Must be valid UTF-8. */
/* JSON_NUMBER */
double number_;
/* JSON_ARRAY */
/* JSON_OBJECT */
struct {
JsonNode *head, *tail;
} children;
};
};
/*** Encoding, decoding, and validation ***/
JsonNode *json_decode (const char *json);
char *json_encode (const JsonNode *node);
char *json_encode_string (const char *str);
char *json_stringify (const JsonNode *node, const char *space);
void json_delete (JsonNode *node);
bool json_validate (const char *json);
/*** Lookup and traversal ***/
JsonNode *json_find_element (JsonNode *array, int index);
JsonNode *json_find_member (JsonNode *object, const char *key);
JsonNode *json_first_child (const JsonNode *node);
#define json_foreach(i, object_or_array) \
for ((i) = json_first_child(object_or_array); \
(i) != NULL; \
(i) = (i)->next)
/*** Construction and manipulation ***/
JsonNode *json_mknull(void);
JsonNode *json_mkbool(bool b);
JsonNode *json_mkstring(const char *s);
JsonNode *json_mknumber(double n);
JsonNode *json_mkarray(void);
JsonNode *json_mkobject(void);
void json_append_element(JsonNode *array, JsonNode *element);
void json_prepend_element(JsonNode *array, JsonNode *element);
void json_append_member(JsonNode *object, const char *key, JsonNode *value);
void json_prepend_member(JsonNode *object, const char *key, JsonNode *value);
void json_remove_from_parent(JsonNode *node);
/*** Debugging ***/
/*
* Look for structure and encoding problems in a JsonNode or its descendents.
*
* If a problem is detected, return false, writing a description of the problem
* to errmsg (unless errmsg is NULL).
*/
bool json_check(const JsonNode *node, char errmsg[256]);
#endif
#include <ccan/json/json.c>
#include <ccan/tap/tap.h>
#include <errno.h>
#include <string.h>
static char *chomp(char *s)
{
char *e;
if (s == NULL || *s == 0)
return s;
e = strchr(s, 0);
if (e[-1] == '\n')
*--e = 0;
return s;
}
/* Build a list of numbers with various appends and prepends, verify them by testing against their encoded value, do pointer consistency checks each time, do element lookups, and remove items as well. */
#include "common.h"
#define should_be(var, expected) should_be_(var, #var, expected)
static void should_be_(const JsonNode *node, const char *name, const char *expected)
{
char errmsg[256];
char *encoded;
if (!json_check(node, errmsg)) {
fail("Invariants check failed: %s", errmsg);
return;
}
encoded = json_encode(node);
if (strcmp(encoded, expected) == 0)
pass("%s is %s", name, expected);
else
fail("%s should be %s, but is actually %s", name, expected, encoded);
free(encoded);
}
static void test_string(void)
{
JsonNode *str;
str = json_mkstring("Hello\tworld!\n\001");
should_be(str, "\"Hello\\tworld!\\n\\u0001\"");
json_delete(str);
str = json_mkstring("\"\\\b\f\n\r\t");
should_be(str, "\"\\\"\\\\\\b\\f\\n\\r\\t\"");
json_delete(str);
}
static void test_number(void)
{
JsonNode *num;
num = json_mknumber(5678901234.0);
should_be(num, "5678901234");
json_delete(num);
num = json_mknumber(-5678901234.0);
should_be(num, "-5678901234");
json_delete(num);
num = json_mknumber(0.0 / 0.0);
should_be(num, "null");
json_delete(num);
}
static void test_array(void)
{
JsonNode *array;
JsonNode *children[5 + 1];
array = json_mkarray();
should_be(array, "[]");
children[1] = json_mknumber(1);
children[2] = json_mknumber(2);
children[3] = json_mknumber(3);
children[4] = json_mknumber(4);
children[5] = json_mknumber(5);
json_append_element(array, children[3]);
should_be(array, "[3]");
json_remove_from_parent(children[3]);
should_be(array, "[]");
json_prepend_element(array, children[3]);
should_be(array, "[3]");
json_prepend_element(array, children[2]);
should_be(array, "[2,3]");
json_append_element(array, children[4]);
should_be(array, "[2,3,4]");
json_delete(children[3]);
should_be(array, "[2,4]");
json_prepend_element(array, children[1]);
should_be(array, "[1,2,4]");
json_delete(children[1]);
should_be(array, "[2,4]");
json_delete(children[4]);
should_be(array, "[2]");
ok1(json_find_element(array, 0) == children[2]);
ok1(json_find_element(array, -1) == NULL);
ok1(json_find_element(array, 1) == NULL);
json_append_element(array, children[5]);
should_be(array, "[2,5]");
ok1(json_find_element(array, 0) == children[2]);
ok1(json_find_element(array, 1) == children[5]);
ok1(json_find_element(array, -1) == NULL);
ok1(json_find_element(array, 2) == NULL);
json_delete(children[2]);
json_delete(children[5]);
should_be(array, "[]");
ok1(json_find_element(array, -1) == NULL);
ok1(json_find_element(array, 0) == NULL);
ok1(json_find_element(array, 1) == NULL);
json_delete(array);
}
static void test_object(void)
{
JsonNode *object;
JsonNode *children[5 + 1];
object = json_mkobject();
should_be(object, "{}");
children[1] = json_mknumber(1);
children[2] = json_mknumber(2);
children[3] = json_mknumber(3);
ok1(json_find_member(object, "one") == NULL);
ok1(json_find_member(object, "two") == NULL);
ok1(json_find_member(object, "three") == NULL);
json_append_member(object, "one", children[1]);
should_be(object, "{\"one\":1}");
ok1(json_find_member(object, "one") == children[1]);
ok1(json_find_member(object, "two") == NULL);
ok1(json_find_member(object, "three") == NULL);
json_prepend_member(object, "two", children[2]);
should_be(object, "{\"two\":2,\"one\":1}");
ok1(json_find_member(object, "one") == children[1]);
ok1(json_find_member(object, "two") == children[2]);
ok1(json_find_member(object, "three") == NULL);
json_append_member(object, "three", children[3]);
should_be(object, "{\"two\":2,\"one\":1,\"three\":3}");
ok1(json_find_member(object, "one") == children[1]);
ok1(json_find_member(object, "two") == children[2]);
ok1(json_find_member(object, "three") == children[3]);
json_delete(object);
}
int main(void)
{
JsonNode *node;
(void) chomp;
plan_tests(49);
ok1(json_find_element(NULL, 0) == NULL);
ok1(json_find_member(NULL, "") == NULL);
ok1(json_first_child(NULL) == NULL);
node = json_mknull();
should_be(node, "null");
json_delete(node);
node = json_mkbool(false);
should_be(node, "false");
json_delete(node);
node = json_mkbool(true);
should_be(node, "true");
json_delete(node);
test_string();
test_number();
test_array();
test_object();
return exit_status();
}
#include "common.h"
int main(void)
{
const char *strings_file = "test/test-strings";
const char *strings_reencoded_file = "test/test-strings-reencoded";
FILE *f, *f2;
char buffer[1024], buffer2[1024];
plan_tests(90);
f = fopen(strings_file, "rb");
if (f == NULL) {
diag("Could not open %s: %s", strings_file, strerror(errno));
return 1;
}
f2 = fopen(strings_reencoded_file, "rb");
if (f2 == NULL) {
diag("Could not open %s: %s", strings_reencoded_file, strerror(errno));
return 1;
}
while (fgets(buffer, sizeof(buffer), f)) {
const char *s = chomp(buffer);
bool valid;
JsonNode *node;
if (expect_literal(&s, "valid ")) {
valid = true;
} else if (expect_literal(&s, "invalid ")) {
valid = false;
} else {
fail("Invalid line in test-strings: %s", buffer);
continue;
}
node = json_decode(s);
if (valid) {
char *reencoded;
char errmsg[256];
if (node == NULL) {
fail("%s is valid, but json_decode returned NULL", s);
continue;
}
if (!json_check(node, errmsg)) {
fail("Corrupt tree produced by json_decode: %s", errmsg);
continue;
}
reencoded = json_encode(node);
if (!fgets(buffer2, sizeof(buffer2), f2)) {
fail("test-strings-reencoded is missing this line: %s", reencoded);
continue;
}
chomp(buffer2);
ok(strcmp(reencoded, buffer2) == 0, "re-encode %s -> %s", s, reencoded);
free(reencoded);
json_delete(node);
} else if (node != NULL) {
fail("%s is invalid, but json_decode returned non-NULL", s);
continue;
}
}
if (ferror(f) || fclose(f) != 0 || ferror(f2) || fclose(f2) != 0) {
diag("I/O error reading test data.");
return 1;
}
return exit_status();
}
#include "common.h"
static char buf1[256], buf2[256];
/* Used for pass and fail messages */
static char *quote_string(const char *str, char buf[256])
{
char *out = buf;
*out++ = '"';
for (; *str != 0; str++) {
if (out - buf > 256 - 5) {
/* String is too long. End it with `...' */
out = buf + 256 - 5;
*out++ = '.';
*out++ = '.';
*out++ = '.';
break;
}
switch (*str) {
case '\t':
*out++ = '\\';
*out++ = 't';
break;
case '\n':
*out++ = '\\';
*out++ = 'n';
break;
case '"':
*out++ = '\\';
*out++ = '"';
break;
case '\\':
*out++ = '\\';
*out++ = '\\';
break;
default:
*out++ = *str;
break;
}
}
*out++ = '"';
*out = 0;
return buf;
}
static void test_stringify(const char *input, const char *expected)
{
JsonNode *node = NULL;
char *enc = NULL;
char *strn = NULL;
char *str = NULL;
node = json_decode(input);
if (node == NULL) {
fail("Failed to decode %s", input);
goto end;
}
enc = json_encode(node);
if (strcmp(enc, input) != 0) {
fail("%s re-encodes to %s. Either encode/decode is broken, or the input string needs to be normalized", input, enc);
goto end;
}
strn = json_stringify(node, NULL);
if (strcmp(strn, enc) != 0) {
fail("json_stringify with NULL space produced a different string than json_encode");
goto end;
}
str = json_stringify(node, "\t");
if (strcmp(str, expected) != 0) {
fail("Expected %s, but json_stringify produced %s",
quote_string(expected, buf1), quote_string(str, buf2));
goto end;
}
pass("stringify %s", input);
end:
json_delete(node);
free(enc);
free(strn);
free(str);
}
int main(void)
{
(void) chomp;
plan_tests(9);
test_stringify("[]", "[]");
test_stringify("[1]", "[\n\t1\n]");
test_stringify("[1,2,3]", "[\n\t1,\n\t2,\n\t3\n]");
test_stringify("[[]]", "[\n\t[]\n]");
test_stringify("[[1,2],[3,4]]", "[\n\t[\n\t\t1,\n\t\t2\n\t],\n\t[\n\t\t3,\n\t\t4\n\t]\n]");
test_stringify("{}", "{}");
test_stringify("{\"one\":1}", "{\n\t\"one\": 1\n}");
test_stringify("{\"one\":1,\"t*\":[2,3,10]}", "{\n\t\"one\": 1,\n\t\"t*\": [\n\t\t2,\n\t\t3,\n\t\t10\n\t]\n}");
test_stringify("{\"a\":{\"1\":1,\"2\":2},\"b\":{\"3\":[null,false,true,\"\\f\"]}}",
"{\n\t\"a\": {\n\t\t\"1\": 1,\n\t\t\"2\": 2\n\t},\n\t\"b\": {\n\t\t\"3\": [\n\t\t\tnull,\n\t\t\tfalse,\n\t\t\ttrue,\n\t\t\t\"\\f\"\n\t\t]\n\t}\n}");
return exit_status();
}
#include "common.h"
int main(void)
{
const char *strings_file = "test/test-strings";
FILE *f;
char buffer[1024];
plan_tests(224);
f = fopen(strings_file, "rb");
if (f == NULL) {
diag("Could not open %s: %s", strings_file, strerror(errno));
return 1;
}
while (fgets(buffer, sizeof(buffer), f)) {
const char *s = chomp(buffer);
bool valid;
if (expect_literal(&s, "valid ")) {
valid = true;
} else if (expect_literal(&s, "invalid ")) {
valid = false;
} else {
fail("Invalid line in test-strings: %s", buffer);
continue;
}
if (strcmp(s, "\"1\\u2\"") == 0)
puts("here");
if (json_validate(s) == valid) {
pass("%s %s", valid ? "valid" : "invalid", s);
} else {
fail("%s is %s, but json_validate returned %s",
s,
valid ? "valid" : "invalid",
valid ? "false" : "true");
}
}
if (ferror(f) || fclose(f) != 0) {
diag("I/O error reading test strings.");
return 1;
}
return exit_status();
}
invalid
invalid
invalid "
invalid [,]
invalid [)
invalid []]
invalid [}
invalid {,}
invalid {]
invalid ["1":2]
invalid [1,2,]
invalid [1:2}
invalid {"1":2,}
invalid {1:2}
invalid {"1":2, "2.5" : [3, 4, {}, {"5": ["6"], [7 ]}]}
invalid {"1":2, "2.5" : [3, 4, {}, {"5": ["6"], [7]}]}
invalid {"1":2, "2.5" : [3, 4, {}, {"5": ["6"], "7" :[8 ]}]
invalid {"1":2, "2.5" : [3, 4, {}, {"5": ["6"], "7" :[8 ]}]]
invalid {"1":2, "3":4
invalid "1\u2"
invalid [,2]
invalid "3
invalid "3" "4"
invalid [3[4]
invalid [3[4]]
invalid [3, [4, [5], 6] 7, 8 9]
invalid [3, [4, [5], 6] 7, 8, 9]
invalid [3, [4, [5], 6], 7, 8 9]
invalid {"hello":true, "bye":false, null}
invalid {"hello":true, "bye":false, null:null}
invalid "hi
invalid "hi"""
invalid {"hi": "bye"]
invalid "\uD800\uD800"
invalid "\uD800\uDBFF"
invalid "\UD834\UDD1E"
invalid "\uDB00"
invalid "\uDB00\uDBFF"
valid "\uFFFE"
valid "\uFFFF"
invalid .
valid ""
valid []