src/gromacs/selection/scanner_internal.h

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