From ef5d1760a3580a919508ba26ff49324d47cd966b Mon Sep 17 00:00:00 2001
From: yyc12345 <yyc12321@outlook.com>
Date: Wed, 1 Nov 2023 10:31:17 +0800
Subject: [PATCH] add lexer and parser for export function binding generation

---
 CodeGen/BMapBindings/ExpFctsLexer.g4  | 23 +++++++++++++++++++++++
 CodeGen/BMapBindings/ExpFctsParser.g4 | 21 +++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 CodeGen/BMapBindings/ExpFctsLexer.g4
 create mode 100644 CodeGen/BMapBindings/ExpFctsParser.g4

diff --git a/CodeGen/BMapBindings/ExpFctsLexer.g4 b/CodeGen/BMapBindings/ExpFctsLexer.g4
new file mode 100644
index 0000000..a705b40
--- /dev/null
+++ b/CodeGen/BMapBindings/ExpFctsLexer.g4
@@ -0,0 +1,23 @@
+lexer grammar ExpFctsLexer;
+
+// keywords
+EXPFCTS_EXPORT: 'LIBCMO_EXPORT' ;
+EXPFCTS_FILE_DECL: 'BMPARAM_FILE_DECL' ;
+EXPFCTS_MESHTRANS_DECL: 'BMPARAM_MESHTRANS_DECL' ;
+EXPFCTS_OBJECT_DECL: 'BMPARAM_OBJECT_DECL' ;
+EXPFCTS_PARAM_IN: 'BMPARAM_IN' ;
+EXPFCTS_PARAM_OUT: 'BMPARAM_OUT' ;
+
+// symbols
+EXPFCTS_LPARENTHESES: '(' ;
+EXPFCTS_RPARENTHESES: ')' ;
+EXPFCTS_COMMA: ',' ;
+EXPFCTS_SEMICOLON: ';' ;
+EXPFCTS_STAR: '*' ;
+EXPFCTS_DOUBLE_COLON: '::' ;
+
+// identifider
+EXPFCTS_IDENTIFIER: [_a-zA-Z][_a-zA-Z0-9]* ;
+
+// remove whitespace and line break
+EXPFCTS_WS: [ \t\n\r\f]+ -> skip ;
diff --git a/CodeGen/BMapBindings/ExpFctsParser.g4 b/CodeGen/BMapBindings/ExpFctsParser.g4
new file mode 100644
index 0000000..9bbae20
--- /dev/null
+++ b/CodeGen/BMapBindings/ExpFctsParser.g4
@@ -0,0 +1,21 @@
+parser grammar ExpFctsParser;
+options { tokenVocab = ExpFctsLexer; }
+
+program: fctDecl* ;
+
+fctDecl
+    : EXPFCTS_EXPORT varType EXPFCTS_IDENTIFIER '(' (fctArg (',' fctArg)*)? ')' ';'
+    ;
+
+fctArg
+    : EXPFCTS_FILE_DECL '(' EXPFCTS_IDENTIFIER ')' # fctArgFileDecl
+    | EXPFCTS_MESHTRANS_DECL '(' EXPFCTS_IDENTIFIER ')' #fctArgMeshTransDecl
+    | EXPFCTS_OBJECT_DECL '(' EXPFCTS_IDENTIFIER ',' EXPFCTS_IDENTIFIER ')' # fctArgObjDecl
+    | EXPFCTS_PARAM_IN '(' varType ',' EXPFCTS_IDENTIFIER ')' # fctArgParamIn
+    | EXPFCTS_PARAM_OUT '(' varType ',' EXPFCTS_IDENTIFIER ')' # fctArgParamOut
+    ;
+
+varType
+    : EXPFCTS_IDENTIFIER ('::' EXPFCTS_IDENTIFIER)* '*'? 
+    ;
+