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feat: hel: c89...

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This commit is contained in:
yukkop
2025-04-19 23:04:29 +00:00
parent 62abe7b846
commit a9d64fe059
4 changed files with 100 additions and 44 deletions
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136
package/c/hel/hel.c
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@@ -11,13 +11,18 @@ PG_MODULE_MAGIC;
/* Helper function to get a JSON value by key path */
static Json *json_get_by_path(Arena *arena, const Json *context, const char *key_path) {
char *path_copy;
char *token;
Json *current;
if (!context || !key_path || !*key_path) {
return NULL;
}
char *path_copy = arena_strdup(arena, key_path);
char *token = strtok(path_copy, ".");
Json *current = (Json*)context;
path_copy = arena_strdup(arena, key_path);
token = strtok(path_copy, ".");
current = (Json*)context;
while (token && current) {
current = json_get_object_item(current, token);
@@ -67,12 +72,15 @@ static char *render_text_node(Arena *arena, const TemplateNode *node) {
/* Render an interpolation node */
static char *render_interpolation_node(Arena *arena, const TemplateNode *node, const Json *context) {
const char *key;
Json *value;
if (!node || node->type != TEMPLATE_NODE_INTERPOLATE || !context) {
return "";
}
const char *key = node->value.interpolate.key;
Json *value = json_get_by_path(arena, context, key);
key = node->value.interpolate.key;
value = json_get_by_path(arena, context, key);
if (!value) {
return "";
@@ -83,40 +91,60 @@ static char *render_interpolation_node(Arena *arena, const TemplateNode *node, c
/* Render a section node (for loop) */
static char *render_section_node(Arena *arena, const TemplateNode *node, const Json *context) {
const char *collection_key;
const char *iterator_name;
TemplateNode *body;
Json *collection;
size_t buffer_size;
char *buffer;
size_t buffer_pos;
Json *item;
const char *empty_json;
Json *iter_context;
Json *item_json;
char *rendered_body;
size_t rendered_len;
if (!node || node->type != TEMPLATE_NODE_SECTION || !context) {
return "";
}
const char *collection_key = node->value.section.collection;
const char *iterator_name = node->value.section.iterator;
TemplateNode *body = node->value.section.body;
collection_key = node->value.section.collection;
iterator_name = node->value.section.iterator;
body = node->value.section.body;
Json *collection = json_get_by_path(arena, context, collection_key);
collection = json_get_by_path(arena, context, collection_key);
if (!collection || collection->type != JSON_ARRAY) {
return "";
}
size_t buffer_size = 1024;
char *buffer = arena_alloc(arena, buffer_size);
size_t buffer_pos = 0;
buffer_size = 1024;
buffer = arena_alloc(arena, buffer_size);
buffer_pos = 0;
Json *item = collection->value.child;
item = collection->value.child;
while (item) {
const char *empty_json = "{}";
Json *iter_context = json_parse(arena, &empty_json);
empty_json = "{}";
iter_context = json_parse(arena, &empty_json);
if (!iter_context) {
return "";
}
Json *item_json = arena_alloc(arena, sizeof(Json));
item_json = arena_alloc(arena, sizeof(Json));
memcpy(item_json, item, sizeof(Json));
item_json->key = arena_strdup(arena, iterator_name);
item_json->next = NULL;
char *rendered_body = render_template_node(arena, body, iter_context);
rendered_body = render_template_node(arena, body, iter_context);
size_t rendered_len = strlen(rendered_body);
rendered_len = strlen(rendered_body);
if (buffer_pos + rendered_len + 1 > buffer_size) {
buffer_size = (buffer_pos + rendered_len + 1) * 2;
buffer = arena_realloc(arena, buffer, buffer_size / 2, buffer_size);
@@ -134,26 +162,38 @@ static char *render_section_node(Arena *arena, const TemplateNode *node, const J
/* Render an include node */
static char *render_include_node(Arena *arena, const TemplateNode *node, const Json *context) {
const char *include_key;
Json *include_value;
char *buffer;
size_t buffer_pos;
Json *include_item;
Json *template_json;
Json *content_json;
Json *context_json;
if (!node || node->type != TEMPLATE_NODE_INCLUDE || !context) {
return "";
}
const char *include_key = node->value.include.key;
Json *include_value = json_get_by_path(arena, context, include_key);
include_key = node->value.include.key;
include_value = json_get_by_path(arena, context, include_key);
if (!include_value || include_value->type != JSON_ARRAY) {
return "";
}
char *buffer = arena_alloc(arena, 1024);
size_t buffer_pos = 0;
buffer = arena_alloc(arena, 1024);
buffer_pos = 0;
Json *include_item = include_value->value.child;
include_item = include_value->value.child;
while (include_item) {
if (include_item->type == JSON_OBJECT) {
Json *template_json = json_get_object_item(include_item, "template");
Json *content_json = json_get_object_item(include_item, "content");
Json *context_json = json_get_object_item(include_item, "context");
template_json = json_get_object_item(include_item, "template");
content_json = json_get_object_item(include_item, "content");
context_json = json_get_object_item(include_item, "context");
if (template_json && template_json->type == JSON_STRING) {
const char *template_str = template_json->value.string;
@@ -183,17 +223,22 @@ static char *render_include_node(Arena *arena, const TemplateNode *node, const J
/* Render a template node tree recursively */
static char *render_template_node(Arena *arena, const TemplateNode *node, const Json *context) {
if (!node) {
return "";
}
size_t buffer_size = 4096;
char *output = arena_alloc(arena, buffer_size);
size_t output_pos = 0;
size_t rendered_len;
const TemplateNode *current;
char *rendered;
if (!node) {
return "";
}
current = node;
const TemplateNode *current = node;
while (current) {
char *rendered = NULL;
rendered = NULL;
switch (current->type) {
case TEMPLATE_NODE_TEXT:
@@ -222,7 +267,7 @@ static char *render_template_node(Arena *arena, const TemplateNode *node, const
break;
}
size_t rendered_len = strlen(rendered);
rendered_len = strlen(rendered);
if (output_pos + rendered_len + 1 > buffer_size) {
buffer_size = (output_pos + rendered_len + 1) * 2;
output = arena_realloc(arena, output, buffer_size / 2, buffer_size);
@@ -272,9 +317,20 @@ Datum render(PG_FUNCTION_ARGS)
/* Initialize arena for memory management */
Arena arena = arena_init(MEM_MiB);
TemplateNode root_node;
TemplateResult template_result;
TemplateConfig config;
Json *context;
const char *template_ptr;
char *result_str;
text *result;
/* Parse the JSON context */
const char *json_ptr = context_str;
Json *context = json_parse(&arena, &json_ptr);
context = json_parse(&arena, &json_ptr);
if (!context) {
arena_free(&arena);
@@ -283,9 +339,9 @@ Datum render(PG_FUNCTION_ARGS)
}
/* Parse the template text */
const char *template_ptr = template_str;
TemplateConfig config = template_default_config();
TemplateResult template_result = template_parse(&arena, &template_ptr, &config);
template_ptr = template_str;
config = template_default_config();
template_result = template_parse(&arena, &template_ptr, &config);
if (IS_RESULT_ERROR(template_result)) {
arena_free(&arena);
@@ -295,11 +351,11 @@ Datum render(PG_FUNCTION_ARGS)
}
/* Render the template */
TemplateNode root_node = RESULT_SOME_VALUE(template_result);
char *result_str = render_template_node(&arena, &root_node, context);
root_node = RESULT_SOME_VALUE(template_result);
result_str = render_template_node(&arena, &root_node, context);
/* Prepare return value */
text *result = cstring_to_text(result_str);
result = cstring_to_text(result_str);
arena_free(&arena);

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