docs: hectic C: types for template parser

package/c/hectic/test/04-templater.c

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+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "hectic.h"
+#include "templater.h"
+
+#define ARENA_SIZE 1024 * 1024
+
+// Test 1: Basic interpolation
+static void test_basic_interpolation(void) {
+    Arena arena = arena_init(ARENA_SIZE);
+    
+    // Initialize template config
+    TemplateConfig *config = template_config_init(&arena);
+    assert(config != NULL);
+    
+    // Create test data
+    const char *json_str = "{\"name\":\"John\",\"age\":30}";
+    Json *data = json_parse(&arena, &json_str);
+    assert(data != NULL);
+    
+    // Create template context
+    TemplateContext *ctx = template_context_init(&arena, data, config);
+    assert(ctx != NULL);
+    
+    // Parse template
+    const char *template = "Hello {% name %}, you are {% age %} years old.";
+    TemplateNode *root = template_parse(&arena, template, config);
+    assert(root != NULL);
+    
+    // Render template
+    char *result = template_render(&arena, root, ctx);
+    assert(result != NULL);
+    assert(strcmp(result, "Hello John, you are 30 years old.") == 0);
+    
+    arena_free(&arena);
+}
+
+// Test 2: Section (loop) with join
+static void test_section_with_join(void) {
+    Arena arena = arena_init(ARENA_SIZE);
+    
+    // Initialize template config
+    TemplateConfig *config = template_config_init(&arena);
+    assert(config != NULL);
+    
+    // Create test data
+    const char *json_str = "{\"items\":[\"apple\",\"banana\",\"orange\"]}";
+    Json *data = json_parse(&arena, &json_str);
+    assert(data != NULL);
+    
+    // Create template context
+    TemplateContext *ctx = template_context_init(&arena, data, config);
+    assert(ctx != NULL);
+    
+    // Parse template
+    const char *template = "{% for item in items join ', ' do %}{% item %}{% %}";
+    TemplateNode *root = template_parse(&arena, template, config);
+    assert(root != NULL);
+    
+    // Render template
+    char *result = template_render(&arena, root, ctx);
+    assert(result != NULL);
+    assert(strcmp(result, "apple, banana, orange") == 0);
+    
+    arena_free(&arena);
+}
+
+// Test 3: Nested sections
+static void test_nested_sections(void) {
+    Arena arena = arena_init(ARENA_SIZE);
+    
+    // Initialize template config
+    TemplateConfig *config = template_config_init(&arena);
+    assert(config != NULL);
+    
+    // Create test data
+    const char *json_str = "{\"users\":[{\"name\":\"John\",\"roles\":[\"admin\",\"user\"]},{\"name\":\"Jane\",\"roles\":[\"user\"]}]}";
+    Json *data = json_parse(&arena, &json_str);
+    assert(data != NULL);
+    
+    // Create template context
+    TemplateContext *ctx = template_context_init(&arena, data, config);
+    assert(ctx != NULL);
+    
+    // Parse template
+    const char *template = "{% for user in users do %}{% user.name %}: {% for role in user.roles join ', ' do %}{% role %}{% %}\n{% %}";
+    TemplateNode *root = template_parse(&arena, template, config);
+    assert(root != NULL);
+    
+    // Render template
+    char *result = template_render(&arena, root, ctx);
+    assert(result != NULL);
+    assert(strcmp(result, "John: admin, user\nJane: user\n") == 0);
+    
+    arena_free(&arena);
+}
+
+// Test 4: Null handling
+static void test_null_handling(void) {
+    Arena arena = arena_init(ARENA_SIZE);
+    
+    // Initialize template config
+    TemplateConfig *config = template_config_init(&arena);
+    assert(config != NULL);
+    
+    // Create test data
+    const char *json_str = "{\"name\":\"John\",\"age\":null}";
+    Json *data = json_parse(&arena, &json_str);
+    assert(data != NULL);
+    
+    // Create template context
+    TemplateContext *ctx = template_context_init(&arena, data, config);
+    assert(ctx != NULL);
+    
+    // Parse template
+    const char *template = "Name: {% name %}\nAge: {% age %%}unknown{% %}";
+    TemplateNode *root = template_parse(&arena, template, config);
+    assert(root != NULL);
+    
+    // Render template
+    char *result = template_render(&arena, root, ctx);
+    assert(result != NULL);
+    assert(strcmp(result, "Name: John\nAge: unknown") == 0);
+    
+    arena_free(&arena);
+}
+
+// Test 5: Complex template with mixed content
+static void test_complex_template(void) {
+    Arena arena = arena_init(ARENA_SIZE);
+    
+    // Initialize template config
+    TemplateConfig *config = template_config_init(&arena);
+    assert(config != NULL);
+    
+    // Create test data
+    const char *json_str = "{\"title\":\"Shopping List\",\"items\":[{\"name\":\"Milk\",\"quantity\":2},{\"name\":\"Bread\",\"quantity\":1}],\"notes\":\"Don't forget the eggs!\"}";
+    Json *data = json_parse(&arena, &json_str);
+    assert(data != NULL);
+    
+    // Create template context
+    TemplateContext *ctx = template_context_init(&arena, data, config);
+    assert(ctx != NULL);
+    
+    // Parse template
+    const char *template = "Title: {% title %}\n\nItems:\n{% for item in items do %}- {% item.name %} ({% item.quantity %})\n{% %}\n\nNotes: {% notes %}";
+    TemplateNode *root = template_parse(&arena, template, config);
+    assert(root != NULL);
+    
+    // Render template
+    char *result = template_render(&arena, root, ctx);
+    assert(result != NULL);
+    assert(strcmp(result, "Title: Shopping List\n\nItems:\n- Milk (2)\n- Bread (1)\n\nNotes: Don't forget the eggs!") == 0);
+    
+    arena_free(&arena);
+}
+
+int main(void) {
+    printf("Running template parser tests...\n");
+    
+    test_basic_interpolation();
+    printf("Test 1: Basic interpolation passed\n");
+    
+    test_section_with_join();
+    printf("Test 2: Section with join passed\n");
+    
+    test_nested_sections();
+    printf("Test 3: Nested sections passed\n");
+    
+    test_null_handling();
+    printf("Test 4: Null handling passed\n");
+    
+    test_complex_template();
+    printf("Test 5: Complex template passed\n");
+    
+    printf("All tests passed!\n");
+    return 0;
+}