feat: init basic bnfgst

src/main/grammars/DevtiParser.bnf

@@ -0,0 +1,22 @@
+{
+  parserClass="DevtiParser"
+  extends="com.intellij.extapi.psi.ASTWrapperPsiElement"
+  psiClassPrefix="DevtiStory"
+  psiImplClassSuffix="Impl"
+  psiPackage="com.example.devtistory.psi"
+  psiImplPackage="com.example.devtistory.psi.impl"
+}
+
+root ::= devtiUrl
+
+devtiUrl ::= 'devti://' storyPath
+
+storyPath ::= 'story' '/' storyId '/' acValues?
+
+storyId ::= integer
+
+// Matches a comma-separated list of AC values enclosed in curly braces
+acValues ::= '{' acValue (',' acValue)* '}'
+
+// Define the rules for integer and ac_value
+acValue ::= ('AC' INTEGER_LITERAL) {pin=2}

src/main/grammars/_DevtiLexer.flex

@@ -0,0 +1,39 @@
+package ;
+
+import com.intellij.lexer.FlexLexer;
+import com.intellij.psi.tree.IElementType;
+
+import static com.intellij.psi.TokenType.BAD_CHARACTER;
+import static com.intellij.psi.TokenType.WHITE_SPACE;
+import static generated.GeneratedTypes.*;
+
+%%
+
+%{
+  public _DevtiLexer() {
+    this((java.io.Reader)null);
+  }
+%}
+
+%public
+%class _DevtiLexer
+%implements FlexLexer
+%function advance
+%type IElementType
+%unicode
+
+EOL=\R
+WHITE_SPACE=\s+
+
+
+%%
+<YYINITIAL> {
+  {WHITE_SPACE}        { return WHITE_SPACE; }
+
+  "integer"            { return INTEGER; }
+  "INTEGER_LITERAL"    { return INTEGER_LITERAL; }
+
+
+}
+
+[^] { return BAD_CHARACTER; }