fix(exts/devin-lang): ensure proper indentation of code blocks in parser grammar #101

The DevInParser.bnf file has been modified to fix an issue where code blocks were not being properly indented. This change ensures that code blocks are correctly identified and parsed, regardless of whether they contain language identifiers or not.

Author: phodal

exts/devin-lang/src/grammar/DevInParser.bnf

@@ -35,6 +35,6 @@ used ::= (
     | VARIABLE_START VARIABLE_ID?
 )
 
-code ::=  CODE_BLOCK_START LANGUAGE_ID? code_contents CODE_BLOCK_END
+code ::=  CODE_BLOCK_START LANGUAGE_ID? NEWLINE code_contents CODE_BLOCK_END
 
 code_contents ::= (NEWLINE | CODE_CONTENT)*

exts/devin-lang/src/test/testData/parser/EmptyCodeFence.txt

@@ -4,8 +4,8 @@ DevInFile
   PsiElement(DevInTokenType.NEWLINE)('\n')
   CodeBlockElement(CODE)
     PsiElement(DevInTokenType.CODE_BLOCK_START)('```')
+    PsiElement(DevInTokenType.NEWLINE)('\n')
     DevInCodeContentsImpl(CODE_CONTENTS)
-      PsiElement(DevInTokenType.NEWLINE)('\n')
       PsiElement(DevInTokenType.CODE_CONTENT)('print("Hello, world!")')
       PsiElement(DevInTokenType.NEWLINE)('\n')
     PsiElement(DevInTokenType.CODE_BLOCK_END)('```')

exts/devin-lang/src/test/testData/parser/JavaHelloWorld.txt

@@ -5,8 +5,8 @@ DevInFile
   CodeBlockElement(CODE)
     PsiElement(DevInTokenType.CODE_BLOCK_START)('```')
     PsiElement(DevInTokenType.LANGUAGE_ID)('java')
+    PsiElement(DevInTokenType.NEWLINE)('\n')
     DevInCodeContentsImpl(CODE_CONTENTS)
-      PsiElement(DevInTokenType.NEWLINE)('\n')
       PsiElement(DevInTokenType.CODE_CONTENT)('public class Main {')
       PsiElement(DevInTokenType.NEWLINE)('\n')
       PsiElement(DevInTokenType.CODE_CONTENT)('    public static void main(String[] args) {')