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thirdparty/JSON_parser/main.c

@@ -0,0 +1,155 @@
+/* main.c */
+
+/*
+    This program demonstrates a simple application of JSON_parser. It reads
+    a JSON text from STDIN, producing an error message if the text is rejected.
+
+        % JSON_parser <test/pass1.json
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <locale.h>
+
+#include "JSON_parser.h"
+
+static int print(void* ctx, int type, const JSON_value* value);
+
+int main(int argc, char* argv[]) {
+    int count = 0, result = 0;
+    FILE* input;
+        
+    JSON_config config;
+
+    struct JSON_parser_struct* jc = NULL;
+    
+    init_JSON_config(&config);
+    
+    config.depth                  = 19;
+    config.callback               = &print;
+    config.allow_comments         = 1;
+    config.handle_floats_manually = 0;
+    
+    /* Important! Set locale before parser is created.*/
+    if (argc >= 2) {
+        if (!setlocale(LC_ALL, argv[1])) {
+            fprintf(stderr, "Failed to set locale to '%s'\n", argv[1]);
+        }
+    } else {
+        fprintf(stderr, "No locale provided, C locale is used\n");
+    }
+    
+    jc = new_JSON_parser(&config);
+    
+    input = stdin;
+    for (; input ; ++count) {
+        int next_char = fgetc(input);
+        if (next_char <= 0) {
+            break;
+        }
+        if (!JSON_parser_char(jc, next_char)) {
+            fprintf(stderr, "JSON_parser_char: syntax error, byte %d\n", count);
+            result = 1;
+            goto done;
+        }
+    }
+    if (!JSON_parser_done(jc)) {
+        fprintf(stderr, "JSON_parser_end: syntax error\n");
+        result = 1;
+        goto done;
+    }
+    
+done:
+    delete_JSON_parser(jc);
+    return result;
+}
+
+static size_t s_Level = 0;
+
+static const char* s_pIndention = "  ";
+
+static int s_IsKey = 0;
+
+static void print_indention()
+{
+    size_t i;
+    
+    for (i = 0; i < s_Level; ++i) {
+        printf("%s", s_pIndention);
+    }
+}
+ 
+
+static int print(void* ctx, int type, const JSON_value* value)
+{
+    switch(type) {
+    case JSON_T_ARRAY_BEGIN:    
+        if (!s_IsKey) print_indention();
+        s_IsKey = 0;
+        printf("[\n");
+        ++s_Level;
+        break;
+    case JSON_T_ARRAY_END:
+        assert(!s_IsKey);
+        if (s_Level > 0) --s_Level;
+        print_indention();
+        printf("]\n");
+        break;
+   case JSON_T_OBJECT_BEGIN:
+       if (!s_IsKey) print_indention();
+       s_IsKey = 0;
+       printf("{\n");
+        ++s_Level;
+        break;
+    case JSON_T_OBJECT_END:
+        assert(!s_IsKey);
+        if (s_Level > 0) --s_Level;
+        print_indention();
+        printf("}\n");
+        break;
+    case JSON_T_INTEGER:
+        if (!s_IsKey) print_indention();
+        s_IsKey = 0;
+        printf("integer: "JSON_PARSER_INTEGER_SPRINTF_TOKEN"\n", value->vu.integer_value);
+        break;
+    case JSON_T_FLOAT:
+        if (!s_IsKey) print_indention();
+        s_IsKey = 0;
+        printf("float: %f\n", value->vu.float_value); /* We wanted stringified floats */
+        break;
+    case JSON_T_NULL:
+        if (!s_IsKey) print_indention();
+        s_IsKey = 0;
+        printf("null\n");
+        break;
+    case JSON_T_TRUE:
+        if (!s_IsKey) print_indention();
+        s_IsKey = 0;
+        printf("true\n");
+        break;
+    case JSON_T_FALSE:
+        if (!s_IsKey) print_indention();
+        s_IsKey = 0;
+        printf("false\n");
+        break;
+    case JSON_T_KEY:
+        s_IsKey = 1;
+        print_indention();
+        printf("key = '%s', value = ", value->vu.str.value);
+        break;   
+    case JSON_T_STRING:
+        if (!s_IsKey) print_indention();
+        s_IsKey = 0;
+        printf("string: '%s'\n", value->vu.str.value);
+        break;
+    default:
+        assert(0);
+        break;
+    }
+    
+    return 1;
+}
+
+