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%code requires{
#include "ast.hpp"
extern ast_Top *g_root; // A way of getting the AST out
//! This is to fix problems when generating C++
// We are declaring the functions provided by Flex, so
// that Bison generated code can call them.
int yylex(void);
void yyerror(const char *);
}
// Represents the value associated with any kind of
// AST node.
%union{
const ast_Base *stmnt;
// double number;
std::string *string;
}
%token T_TYPE_SPEC T_TYPE_QUAL T_STRG_SPEC T_IDENTIFIER
%token T_SC T_CMA T_EQ T_LRB T_RRB T_LCB T_RCB
%token T_INT_CONST
%type <stmnt> EXT_DEF EXT_DECLARATION EXT_DECLARATION_2
%type <stmnt> FUNC_DEF
%type <stmnt> DECLARATION DECLARATION_SPEC DECLARATION_SPEC_T INIT_DECLARATOR INIT_DECLARATOR_LIST DECLARATOR INITIALIZER
// %type <number> // T_CONSTANT
%type <string> T_IDENTIFIER //T_OPERATOR
%start ROOT
%%
ROOT : EXT_DEF { ; }
// EXTERNAL DEFINITION
EXT_DEF : EXT_DECLARATION { g_root->push($1); }
| EXT_DEF EXT_DECLARATION { g_root->push($2); }
EXT_DECLARATION : DECLARATION_SPEC EXT_DECLARATION_2 { $$ = $2; }
EXT_DECLARATION_2 : DECLARATION { $$ = $1; }
| FUNC_DEF { ; }
// FUNCTION DEFINITION
FUNC_DEF : T_IDENTIFIER T_LRB T_RRB T_LCB T_RCB { ; }
// DECLARATION
DECLARATION : INIT_DECLARATOR_LIST T_SC { $$ = $1; }
DECLARATION_SPEC : DECLARATION_SPEC_T { ; }
| DECLARATION_SPEC_T DECLARATION_SPEC { ; }
DECLARATION_SPEC_T : T_TYPE_SPEC { ; }
| T_TYPE_QUAL { ; }
| T_STRG_SPEC { ; }
INIT_DECLARATOR_LIST : INIT_DECLARATOR { $$ = new ast_VariableDeclaration($1); }
| INIT_DECLARATOR_LIST T_CMA INIT_DECLARATOR { $$->push($3); }
INIT_DECLARATOR : DECLARATOR { ; }
| DECLARATOR T_EQ INITIALIZER { ; }
DECLARATOR : T_IDENTIFIER {$$ = new ast_Variable(*$1); }
INITIALIZER : T_INT_CONST { ; }
// STATEMENTS
%%
ast_Top *g_root; // Definition of variable (to match declaration earlier)
ast_Top *parseAST() {
g_root = new ast_Top;
yyparse();
return g_root;
}
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