cmake/Source/LexerParser/cmFortranParser.y

%{
/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file Copyright.txt or https://cmake.org/licensing for details.  */
/*-------------------------------------------------------------------------
  Portions of this source have been derived from makedepf90 version 2.8.8,

   Copyright (C) 2000--2006 Erik Edelmann <erik.edelmann@iki.fi>

  The code was originally distributed under the GPL but permission
  from the copyright holder has been obtained to distribute this
  derived work under the CMake license.
-------------------------------------------------------------------------*/

/*

This file must be translated to C and modified to build everywhere.

Run bison like this:

  bison --yacc --name-prefix=cmFortran_yy
        --defines=cmFortranParserTokens.h
         -ocmFortranParser.cxx
          cmFortranParser.y

Modify cmFortranParser.cxx:
  - "#if 0" out yyerrorlab block in range ["goto yyerrlab1", "yyerrlab1:"]
*/

#include "cmConfigure.h" // IWYU pragma: keep

#include "cmsys/String.h"
#include <stdlib.h>
#include <string.h>

/*-------------------------------------------------------------------------*/
#define cmFortranParser_cxx
#include "cmFortranParser.h" /* Interface to parser object.  */
#include "cmFortranParserTokens.h" /* Need YYSTYPE for YY_DECL.  */

/* Forward declare the lexer entry point.  */
YY_DECL;

/* Helper function to forward error callback from parser.  */
static void cmFortran_yyerror(yyscan_t yyscanner, const char* message)
{
  cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
  cmFortranParser_Error(parser, message);
}

/* Disable some warnings in the generated code.  */
#ifdef _MSC_VER
# pragma warning (disable: 4102) /* Unused goto label.  */
# pragma warning (disable: 4065) /* Switch contains default but no case. */
# pragma warning (disable: 4701) /* Local variable may not be initialized.  */
# pragma warning (disable: 4702) /* Unreachable code.  */
# pragma warning (disable: 4127) /* Conditional expression is constant.  */
# pragma warning (disable: 4244) /* Conversion to smaller type, data loss. */
#endif
#if defined(__GNUC__) && __GNUC__ >= 8
# pragma GCC diagnostic ignored "-Wconversion"
#endif
%}

/* Generate a reentrant parser object.  */
%define api.pure

/* Configure the parser to use a lexer object.  */
%lex-param   {yyscan_t yyscanner}
%parse-param {yyscan_t yyscanner}

%define parse.error verbose

%union {
  char* string;
}

/*-------------------------------------------------------------------------*/
/* Tokens */
%token EOSTMT ASSIGNMENT_OP GARBAGE
%token CPP_LINE_DIRECTIVE
%token CPP_INCLUDE F90PPR_INCLUDE COCO_INCLUDE
%token F90PPR_DEFINE CPP_DEFINE F90PPR_UNDEF CPP_UNDEF
%token CPP_IFDEF CPP_IFNDEF CPP_IF CPP_ELSE CPP_ELIF CPP_ENDIF
%token F90PPR_IFDEF F90PPR_IFNDEF F90PPR_IF
%token F90PPR_ELSE F90PPR_ELIF F90PPR_ENDIF
%token COMMA COLON DCOLON LPAREN RPAREN
%token <number> UNTERMINATED_STRING
%token <string> STRING WORD
%token <string> CPP_INCLUDE_ANGLE
%token END
%token INCLUDE
%token INTERFACE
%token MODULE
%token SUBMODULE
%token USE

/*-------------------------------------------------------------------------*/
/* grammar */
%%

code: /* empty */ | code stmt;

stmt:
  INTERFACE EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_SetInInterface(parser, true);
  }
| USE WORD other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleUse(parser, $2);
    free($2);
  }
| MODULE WORD other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    if (cmsysString_strcasecmp($2, "function") != 0 &&
        cmsysString_strcasecmp($2, "procedure") != 0 &&
        cmsysString_strcasecmp($2, "subroutine") != 0) {
      cmFortranParser_RuleModule(parser, $2);
    }
    free($2);
  }
| SUBMODULE LPAREN WORD RPAREN WORD other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleSubmodule(parser, $3, $5);
    free($3);
    free($5);
  }
| SUBMODULE LPAREN WORD COLON WORD RPAREN WORD other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleSubmoduleNested(parser, $3, $5, $7);
    free($3);
    free($5);
    free($7);
  }
| INTERFACE WORD other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_SetInInterface(parser, true);
    free($2);
  }
| END INTERFACE other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_SetInInterface(parser, false);
  }
| USE DCOLON WORD other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleUse(parser, $3);
    free($3);
  }
| USE COMMA WORD DCOLON WORD other EOSTMT {
    if (cmsysString_strcasecmp($3, "non_intrinsic") == 0) {
      cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
      cmFortranParser_RuleUse(parser, $5);
    }
    free($3);
    free($5);
  }
| INCLUDE STRING other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleInclude(parser, $2);
    free($2);
  }
| CPP_LINE_DIRECTIVE STRING other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleLineDirective(parser, $2);
    free($2);
  }
| CPP_INCLUDE_ANGLE other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleInclude(parser, $1);
    free($1);
  }
| include STRING other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleInclude(parser, $2);
    free($2);
  }
| define WORD other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleDefine(parser, $2);
    free($2);
  }
| undef WORD other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleUndef(parser, $2);
    free($2);
  }
| ifdef WORD other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleIfdef(parser, $2);
    free($2);
  }
| ifndef WORD other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleIfndef(parser, $2);
    free($2);
  }
| if other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleIf(parser);
  }
| elif other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleElif(parser);
  }
| else other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleElse(parser);
  }
| endif other EOSTMT {
    cmFortranParser* parser = cmFortran_yyget_extra(yyscanner);
    cmFortranParser_RuleEndif(parser);
  }
| EOSTMT
| error EOSTMT /* tolerate unknown statements until their end */
;



include: CPP_INCLUDE | F90PPR_INCLUDE | COCO_INCLUDE ;
define: CPP_DEFINE | F90PPR_DEFINE;
undef: CPP_UNDEF | F90PPR_UNDEF ;
ifdef: CPP_IFDEF | F90PPR_IFDEF ;
ifndef: CPP_IFNDEF | F90PPR_IFNDEF ;
if: CPP_IF | F90PPR_IF ;
elif: CPP_ELIF | F90PPR_ELIF ;
else: CPP_ELSE | F90PPR_ELSE ;
endif: CPP_ENDIF | F90PPR_ENDIF ;
other: /* empty */ | other misc_code ;

misc_code:
  WORD                { free ($1); }
| END
| INCLUDE
| INTERFACE
| MODULE
| SUBMODULE
| USE
| STRING              { free ($1); }
| GARBAGE
| ASSIGNMENT_OP
| COLON
| DCOLON
| LPAREN
| RPAREN
| COMMA
| UNTERMINATED_STRING
;

%%
/* End of grammar */