added constant parsing to cst

sample.hexo

@@ -1,22 +1 @@
-$ class_name 'HelloWorld'
-$ object_superclass_name 'java/lang/Object'
-
-# class_declaration {
-  > 0100
-  > #len($0)
-  > $0
-}
-
-> cafe babe // Magic number
-
-> 0000 0034 // Java Bytecode version
-> 0005 // Constant pool size
-> 0700 02 // Class at index 2
-
-> #class_declaration($class_name)
-> 0700 04 // Class at index 4
-> #class_declaration($object_superclass_name)
-
-> 0021 // Supper public
-> 0001 0003 // Class pointers
-> 0000 0000 0000 0000 // No interfaces, fields, methods, attributes
+$ hello_world 'hello world' 01

src/cst/parser.rs

@@ -58,7 +58,7 @@ fn parse_function_body(node: &AstNode) -> Result<BodyParsingResult, CstParserErr
 
     for child in &node.children {
         match child.node_type {
-            AstNodeType::StatementConst => {}
+            AstNodeType::StatementConst => constants.push(parse_constant(child)?),
             AstNodeType::StatementEmit => emits.push(parse_emit_statement(child)?),
             AstNodeType::StatementFn => functions.push(parse_function(child)?),
             _ => return Err(CstParserError::UnexpectedNode {
@@ -75,6 +75,29 @@ fn parse_function_body(node: &AstNode) -> Result<BodyParsingResult, CstParserErr
     Ok((emits, functions, constants))
 }
 
+fn parse_constant(node: &AstNode) -> Result<CstConstantStatement, CstParserError> {
+    guard_node_type(node, AstNodeType::StatementConst)?;
+    let mut atom_buff = Vec::new();
+    let mut name = None;
+
+    for child in &node.children {
+        match child.node_type {
+            AstNodeType::StatementConstName => {
+                name = Some(parse_value_of(child)?);
+            }
+            _ => parse_atom_into(child, &mut atom_buff)?,
+        }
+    }
+
+    Ok(
+        CstConstantStatement {
+            name: name.ok_or(CstParserError::MissingContent { node_type: AstNodeType::StatementConstName })?.to_string(),
+            atoms: atom_buff,
+        }
+
+    )
+}
+
 fn parse_function(node: &AstNode) -> Result<CstFunctionStatement, CstParserError> {
     let mut emits = None;
     let mut functions = None;