Compile echo tag to VM code

Author: dylanahsmith

ext/liquid_c/block.c

@@ -535,7 +535,8 @@ static VALUE block_body_add_write_raw(VALUE self, VALUE string)
 {
     block_body_t *body;
     BlockBody_Get_Struct(self, body);
-    vm_assembler_add_write_raw_from_ruby(&body->code, string);
+    ensure_intermediate(body);
+    vm_assembler_add_write_raw_from_ruby(body->as.intermediate.code, string);
     return self;
 }
 

ext/liquid_c/tag.c

@@ -1,6 +1,8 @@
 #include "liquid.h"
 #include "vm_assembler.h"
 #include "block.h"
+#include "tokenizer.h"
+#include "variable.h"
 
 static ID id_parse;
 
@@ -29,10 +31,32 @@ static VALUE tag_compile(VALUE self, VALUE block_body_obj)
 {
     block_body_t *body;
     BlockBody_Get_Struct(block_body_obj, body);
+    block_body_ensure_intermediate(body);
     vm_assembler_add_write_node_from_ruby(body->as.intermediate.code, self);
     return Qnil;
 }
 
+static VALUE echo_class_compile(VALUE klass, VALUE tag_name, VALUE markup,
+        VALUE tokenizer_obj, VALUE parse_context_obj, VALUE block_body_obj)
+{
+    block_body_t *body;
+    BlockBody_Get_Struct(block_body_obj, body);
+    block_body_ensure_intermediate(body);
+
+    tokenizer_t *tokenizer;
+    Tokenizer_Get_Struct(tokenizer_obj, tokenizer);
+
+    variable_parse_args_t parse_args = {
+        .markup = RSTRING_PTR(markup),
+        .markup_end = RSTRING_PTR(markup) + RSTRING_LEN(markup),
+        .code = body->as.intermediate.code,
+        .code_obj = block_body_obj,
+        .parse_context = parse_context_obj,
+    };
+    internal_variable_compile(&parse_args, tokenizer->line_number);
+    return Qnil;
+}
+
 void liquid_define_tag()
 {
     id_parse = rb_intern("parse");
@@ -42,4 +66,7 @@ void liquid_define_tag()
 
     rb_define_singleton_method(cLiquidTag, "compile", tag_class_compile, 5);
     rb_define_method(cLiquidTag, "compile", tag_compile, 1);
+
+    VALUE cLiquidEcho = rb_const_get(mLiquid, rb_intern("Echo"));
+    rb_define_singleton_method(cLiquidEcho, "compile", echo_class_compile, 5);
 }