feat: extract HTML template parser/codegen from feat/el-html-templates

Parser additions (parser.el, no existing features removed): - HTML template parser functions: is_html_tag_name, is_void_element, parse_html_text_tokens, parse_html_attrs, parse_html_children, parse_html_each_body, parse_html_element, parse_html_template - HtmlTemplate detection in parse_primary (<tagname> and <!doctype>) - Lambda fn literal expression node (parse_primary) - Enum::Variant pattern matching (parse_pattern) - type definition optional = before { - try/catch statement (TryCatch AST node) Codegen additions (codegen.el, no existing features removed): - HTML template C codegen: cg_html_template, cg_html_parts, cg_html_attrs_str, cg_html_element_str, cg_html_each, next_html_id - HtmlTemplate and Lambda dispatch in cg_expr - Variant pattern support in cg_match - TryCatch lowering in cg_stmt (C: runs try body, ignores catch) - builtin_arity entries: getpid_now, stdout_to_file, stdout_restore JS codegen additions (codegen-js.el, pure additions only): - JS HTML template codegen: js_cg_html_template and helpers - HtmlTemplate dispatch in js_cg_expr Example: examples/html-page.el
2026-05-05 00:17:59 -05:00
parent 847f556ee3
commit 3e7d316c65
4 changed files with 911 additions and 4 deletions
@@ -0,0 +1,40 @@
+// html-page.el — Example of native HTML template syntax in El.
+//
+// El HTML templates let you write HTML directly in expression position.
+// Interpolated values are automatically HTML-escaped.
+// Use raw(expr) to bypass escaping when you know the content is safe.
+//
+// Compile and run:
+//   ./dist/platform/elc examples/html-page.el > /tmp/html-page.c
+//   cc -std=c11 -I el-compiler/runtime -lcurl -lpthread \
+//      -o /tmp/html-page /tmp/html-page.c el-compiler/runtime/el_runtime.c
+//   /tmp/html-page
+
+fn render_item(item: String) -> String {
+    return <li class="item">{item}</li>
+}
+
+fn render_page(title: String, items: [String]) -> String {
+    return <!doctype html>
+    <html lang="en">
+        <head>
+            <meta charset="utf-8" />
+            <title>{title}</title>
+        </head>
+        <body>
+            <h1>{title}</h1>
+            <ul>
+                {#each items as item}
+                    <li class="item">{item}</li>
+                {/each}
+            </ul>
+            <p>Built with El HTML templates</p>
+        </body>
+    </html>
+}
+
+fn main() -> Void {
+    let items: [String] = ["Lexer", "Parser", "Codegen", "Runtime"]
+    let page: String = render_page("El Compiler Stages", items)
+    println(page)
+}