0027342: STEP - support C++ streams for import / export

- STEP low-level parser is converted to C++; required minimal version of flex is elevated to 2.5.37.
- Added possibility to import STEP from stream, see new method XSControl_Reader::ReadStream() (now implemented in STEP only).
- Parsers ported to win_flex_bison 2.5.23 (flex 2.6.4, bison 3.7.1)
- Added support of C++ flex and bison scanners in in CMake scripts
- Some code clean-up in StepFile and around (unused files and functions are eliminated)
- Option to read from stream is added in DRAW command testreadstep for testing ReadStream() function
- Added test bugs step bug27342

src/ExprIntrp/ExprIntrp.tab.h

@@ -1,19 +1,20 @@
-/* A Bison parser, made by GNU Bison 2.7.  */
+/* A Bison parser, made by GNU Bison 3.7.1.  */
 
 /* Bison interface for Yacc-like parsers in C
-   
-      Copyright (C) 1984, 1989-1990, 2000-2012 Free Software Foundation, Inc.
-   
+
+   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2020 Free Software Foundation,
+   Inc.
+
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
-   
+
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
-   
+
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
@@ -26,13 +27,17 @@
    special exception, which will cause the skeleton and the resulting
    Bison output files to be licensed under the GNU General Public
    License without this special exception.
-   
+
    This special exception was added by the Free Software Foundation in
    version 2.2 of Bison.  */
 
-#ifndef YY_EXPRINTRP_D_ABV_OCCT_OCCT_SRC_EXPRINTRP_EXPRINTRP_TAB_H_INCLUDED
-# define YY_EXPRINTRP_D_ABV_OCCT_OCCT_SRC_EXPRINTRP_EXPRINTRP_TAB_H_INCLUDED
-/* Enabling traces.  */
+/* DO NOT RELY ON FEATURES THAT ARE NOT DOCUMENTED in the manual,
+   especially those whose name start with YY_ or yy_.  They are
+   private implementation details that can be changed or removed.  */
+
+#ifndef YY_EXPRINTRP_EXPRINTRP_EXPRINTRP_TAB_H_INCLUDED
+# define YY_EXPRINTRP_EXPRINTRP_EXPRINTRP_TAB_H_INCLUDED
+/* Debug traces.  */
 #ifndef YYDEBUG
 # define YYDEBUG 0
 #endif
@@ -40,59 +45,51 @@
 extern int ExprIntrpdebug;
 #endif
 
-/* Tokens.  */
+/* Token kinds.  */
 #ifndef YYTOKENTYPE
 # define YYTOKENTYPE
-   /* Put the tokens into the symbol table, so that GDB and other debuggers
-      know about them.  */
-   enum yytokentype {
-     SUMOP = 258,
-     MINUSOP = 259,
-     DIVIDEOP = 260,
-     EXPOP = 261,
-     MULTOP = 262,
-     PARENTHESIS = 263,
-     BRACKET = 264,
-     ENDPARENTHESIS = 265,
-     ENDBRACKET = 266,
-     VALUE = 267,
-     IDENTIFIER = 268,
-     COMMA = 269,
-     DIFFERENTIAL = 270,
-     DERIVATE = 271,
-     DERIVKEY = 272,
-     ASSIGNOP = 273,
-     DEASSIGNKEY = 274,
-     EQUALOP = 275,
-     RELSEPARATOR = 276,
-     CONSTKEY = 277,
-     SUMKEY = 278,
-     PRODKEY = 279
-   };
+  enum yytokentype
+  {
+    YYEMPTY = -2,
+    YYEOF = 0,                     /* "end of file"  */
+    YYerror = 256,                 /* error  */
+    YYUNDEF = 257,                 /* "invalid token"  */
+    SUMOP = 258,                   /* SUMOP  */
+    MINUSOP = 259,                 /* MINUSOP  */
+    DIVIDEOP = 260,                /* DIVIDEOP  */
+    EXPOP = 261,                   /* EXPOP  */
+    MULTOP = 262,                  /* MULTOP  */
+    PARENTHESIS = 263,             /* PARENTHESIS  */
+    BRACKET = 264,                 /* BRACKET  */
+    ENDPARENTHESIS = 265,          /* ENDPARENTHESIS  */
+    ENDBRACKET = 266,              /* ENDBRACKET  */
+    VALUE = 267,                   /* VALUE  */
+    IDENTIFIER = 268,              /* IDENTIFIER  */
+    COMMA = 269,                   /* COMMA  */
+    DIFFERENTIAL = 270,            /* DIFFERENTIAL  */
+    DERIVATE = 271,                /* DERIVATE  */
+    DERIVKEY = 272,                /* DERIVKEY  */
+    ASSIGNOP = 273,                /* ASSIGNOP  */
+    DEASSIGNKEY = 274,             /* DEASSIGNKEY  */
+    EQUALOP = 275,                 /* EQUALOP  */
+    RELSEPARATOR = 276,            /* RELSEPARATOR  */
+    CONSTKEY = 277,                /* CONSTKEY  */
+    SUMKEY = 278,                  /* SUMKEY  */
+    PRODKEY = 279                  /* PRODKEY  */
+  };
+  typedef enum yytokentype yytoken_kind_t;
 #endif
 
-
+/* Value type.  */
 #if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
 typedef int YYSTYPE;
 # define YYSTYPE_IS_TRIVIAL 1
-# define yystype YYSTYPE /* obsolescent; will be withdrawn */
 # define YYSTYPE_IS_DECLARED 1
 #endif
 
+
 extern YYSTYPE ExprIntrplval;
 
-#ifdef YYPARSE_PARAM
-#if defined __STDC__ || defined __cplusplus
-int ExprIntrpparse (void *YYPARSE_PARAM);
-#else
-int ExprIntrpparse ();
-#endif
-#else /* ! YYPARSE_PARAM */
-#if defined __STDC__ || defined __cplusplus
 int ExprIntrpparse (void);
-#else
-int ExprIntrpparse ();
-#endif
-#endif /* ! YYPARSE_PARAM */
 
-#endif /* !YY_EXPRINTRP_D_ABV_OCCT_OCCT_SRC_EXPRINTRP_EXPRINTRP_TAB_H_INCLUDED  */
+#endif /* !YY_EXPRINTRP_EXPRINTRP_EXPRINTRP_TAB_H_INCLUDED  */

src/ExprIntrp/ExprIntrp.yacc

@@ -1,4 +1,3 @@
-/* 
 /* Copyright (c) 1997-1999 Matra Datavision
  Copyright (c) 1999-2014 OPEN CASCADE SAS