src/gromacs/selection/scanner_internal.h

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  35 /*! \internal \file
  36  * \brief Internal header file used by the selection tokenizer.
  37  *
  38  * \author Teemu Murtola <teemu.murtola@gmail.com>
  39  * \ingroup module_selection
  40  */
  41 #ifndef SELECTION_SCANNER_INTERNAL_H
  42 #define SELECTION_SCANNER_INTERNAL_H
  43
  44 #include <boost/exception_ptr.hpp>
  45
  46 #include "parser.h"
  47
  48 namespace gmx
  49 {
  50 class SelectionParserSymbol;
  51 class TextWriter;
  52 }
  53
  54 /* These need to be defined before including scanner_flex.h, because it
  55  * uses YY_EXTRA_TYPE. But we also need to include it before defining
  56  * gmx_sel_lexer_t; hence the forward declaration. */
  57 struct gmx_sel_lexer_t;
  58 #define YY_EXTRA_TYPE struct gmx_sel_lexer_t *
  59
  60 /* We cannot include scanner_flex.h from the scanner itself, because it
  61  * seems to break everything. */
  62 /* And we need to define YY_NO_UNISTD_H here as well, otherwise unistd.h
  63  * gets included in other files than scanner.cpp... */
  64 #ifndef FLEX_SCANNER
  65 #define YY_NO_UNISTD_H
  66 #include "scanner_flex.h"
  67 #endif
  68
  69 /*! \internal \brief
  70  * Internal data structure for the selection tokenizer state.
  71  */
  72 typedef struct gmx_sel_lexer_t
  73 {
  74     //! Selection collection to put parsed selections in.
  75     struct gmx_ana_selcollection_t  *sc;
  76     //! Stores an exception that occurred during parsing.
  77     boost::exception_ptr             exception;
  78     //! Whether external index groups have been set.
  79     bool                             bGroups;
  80     //! External index groups for resolving \c group keywords.
  81     struct gmx_ana_indexgrps_t      *grps;
  82     //! Number of selections at which the parser should stop.
  83     int                              nexpsel;
  84
  85     //! Writer to use for status output (if not NULL, parser is interactive).
  86     gmx::TextWriter                 *statusWriter;
  87
  88     //! Pretty-printed version of the string parsed since last clear.
  89     char                            *pselstr;
  90     //! Length of the string in \a pselstr.
  91     int                              pslen;
  92     //! Number of bytes allocated for \a pselstr.
  93     int                              nalloc_psel;
  94     /*! \brief
  95      * Position of the result of the current Bison action.
  96      *
  97      * This identifies the part of \a pselstr that corresponds to the
  98      * subselection that is currently being reduced by Bison.
  99      */
 100     gmx::SelectionLocation           currentLocation;
 101
 102     //! Stack of methods in which parameters should be looked up.
 103     struct gmx_ana_selmethod_t     **mstack;
 104     //! Index of the top of the stack in \a mstack.
 105     int                              msp;
 106     //! Number of elements allocated for \a mstack.
 107     int                              mstack_alloc;
 108
 109     //! Number of END_OF_METHOD tokens to return before \a nextparam.
 110     int                              neom;
 111     //! Parameter symbol to return before resuming scanning.
 112     struct gmx_ana_selparam_t       *nextparam;
 113     //! Whether \a nextparam was a boolean parameter with a 'no' prefix.
 114     bool                             bBoolNo;
 115     /*! \brief
 116      * Method symbol to return before resuming scanning
 117      *
 118      * Only used when \p nextparam is NULL.
 119      */
 120     const gmx::SelectionParserSymbol *nextMethodSymbol;
 121     //! Used to track whether the previous token was a position modifier.
 122     int                               prev_pos_kw;
 123
 124     //! Whether the 'of' keyword is acceptable as the next token.
 125     bool                             bMatchOf;
 126     //! Whether boolean values (yes/no/on/off) are acceptable as the next token.
 127     bool                             bMatchBool;
 128     //! Whether the next token starts a new selection.
 129     bool                             bCmdStart;
 130
 131     //! Whether an external buffer is set for the scanner.
 132     bool                             bBuffer;
 133     //! The current buffer for the scanner.
 134     YY_BUFFER_STATE                  buffer;
 135 } gmx_sel_lexer_t;
 136
 137 /* Because Flex defines yylval, yytext, and yyleng as macros,
 138  * and this file is included from scanner.l,
 139  * we cannot have them here as parameter names... */
 140 /** Internal function for cases where several tokens need to be returned. */
 141 int
 142 _gmx_sel_lexer_process_pending(YYSTYPE *, YYLTYPE *, gmx_sel_lexer_t *state);
 143 /** Internal function that processes identifier tokens. */
 144 int
 145     _gmx_sel_lexer_process_identifier(YYSTYPE *, YYLTYPE *, char *, size_t,
 146                                       gmx_sel_lexer_t *state);
 147 /** Internal function to add a token to the pretty-printed selection text. */
 148 void
 149 _gmx_sel_lexer_add_token(YYLTYPE *, const char *str, int len, gmx_sel_lexer_t *state);
 150
 151 #endif