Implement json parser for texts

1 files changed, 136 insertions, 0 deletions

diff --git a/src/text.c b/src/text.c
index 9bace21..4674a7e 100644
--- a/src/text.c
+++ b/src/text.c
@@ -1,13 +1,149 @@
 #include <f8.h>
 #include <stdio.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <yaml.h>
+#include <cJSON.h>
 
 #include "idlist.h"
 #include "vector.h"
 #include "text.h"
 
+static char *load_data_from_file(const char *filename)
+{
+    int ret = 0;
+    FILE *file = NULL;
+    char *data = NULL;
+
+    file = fopen(filename, "rb");
+    if (file == NULL) {
+        perror(filename);
+        return NULL;
+    }
+
+    ret |= fseek(file, 0, SEEK_END);
+    long file_size = ftell(file);
+    ret |= fseek(file, 0, SEEK_SET);
+    if (ret == -1 || file_size == -1) {
+        perror("fseek/ftell");
+        goto cleanup_close;
+    }
+
+    data = calloc(file_size + 1, sizeof(char));
+    if (data == NULL) {
+        perror("calloc");
+        goto cleanup_close;
+    }
+
+    size_t nbyte = fread(data, sizeof(char), file_size, file);
+    if (nbyte == 0) {
+        perror("fread");
+        goto cleanup_free;
+    }
+
+    goto cleanup_close;
+
+cleanup_free:
+    free(data);
+    data = NULL;
+
+cleanup_close:
+    fclose(file);
+    return data;
+}
+
+static char *texts_cjson_get_string(cJSON *object, const char *key)
+{
+    char *string = NULL;
+    cJSON *item = cJSON_GetObjectItem(object, key);
+    if (cJSON_IsString(item)) {
+        char *value = cJSON_GetStringValue(item);
+        if (value != NULL) {
+            size_t size = strlen(value) + 1;
+            string = calloc(size, sizeof(char));
+            if (string != NULL)
+                strncpy(string, value, size);
+        }
+    }
+    return string;
+}
+
+static wchar_t *texts_cjson_get_string_utf32(cJSON *object, const char *key)
+{
+    wchar_t *string = NULL;
+    cJSON *item = cJSON_GetObjectItem(object, key);
+    if (cJSON_IsString(item)) {
+        char *value = cJSON_GetStringValue(item);
+        if (value != NULL) {
+            size_t size = utf8_strlen(value) + 1;
+            string = calloc(size, sizeof(wchar_t));
+            if (string != NULL)
+                utf8to32_strcpy(string, value);
+        }
+    }
+    return string;
+}
+
+static int texts_cjson_get_int(cJSON *object, const char *key)
+{
+    int value = 0;
+    cJSON *item = cJSON_GetObjectItem(object, key);
+    if (cJSON_IsNumber(item))
+        value = item->valueint;
+    return value;
+}
+
+struct idlist *load_texts_from_json(const char *filename)
+{
+    struct cJSON_Hooks hooks = (struct cJSON_Hooks){
+        .malloc_fn = malloc,
+        .free_fn = free,
+    };
+    cJSON_InitHooks(&hooks);
+
+    char *data = load_data_from_file(filename);
+    if (data == NULL) {
+        return NULL;
+    }
+
+    struct idlist *texts = NULL;
+    struct idlist *texts_node = texts;
+
+    cJSON *json_data = cJSON_Parse(data);
+    if (cJSON_IsArray(json_data)) {
+        size_t array_size = cJSON_GetArraySize(json_data);
+        for (size_t i = 0; i < array_size; i++) {
+            cJSON *item = cJSON_GetArrayItem(json_data, i);
+            if (cJSON_IsObject(item)) {
+
+                /* Allocate texts node to be filled */
+
+                if (!texts) {
+                    texts_node = texts = list_new();
+                } else {
+                    texts_node = list_append(texts);
+                }
+                texts_node->obj = calloc(1, sizeof(struct text));
+                struct text *text = texts_node->obj;
+
+                /* Fill the node */
+
+                text->type = texts_cjson_get_string(item, "type");
+                text->scene = texts_cjson_get_string(item, "scene");
+                text->text = texts_cjson_get_string_utf32(item, "text");
+                text->font = texts_cjson_get_string(item, "font");
+                text->size = texts_cjson_get_int(item, "size");
+                text->pos.x = texts_cjson_get_int(item, "x");
+                text->pos.y = texts_cjson_get_int(item, "y");
+            }
+        }
+    }
+    free(data);
+    cJSON_Delete(json_data);
+    return texts;
+}
+
 static FILE *openFile(char *filename)
 {
     FILE *file;