src/gmxlib/selection/parsetree.h

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  31 /*! \internal \file
  32  * \brief Handling of intermediate selection parser data.
  33  *
  34  * The data types declared in this header are used by the parser to store
  35  * intermediate data when constructing method expressions.
  36  * In particular, the parameters for the method are stored.
  37  * The intermediate data is freed once a \c t_selelem object can be
  38  * constructed.
  39  *
  40  * This is an implementation header: there should be no need to use it outside
  41  * this directory.
  42  */
  43 #ifndef SELECTION_PARSETREE_H
  44 #define SELECTION_PARSETREE_H
  45
  46 /*#include <typedefs.h>*/
  47 #include <types/simple.h>
  48
  49
  50 #include <selvalue.h>
  51
  52 struct t_selelem;
  53 struct gmx_ana_indexgrps_t;
  54 struct gmx_ana_selmethod_t;
  55 struct gmx_ana_selparam_t;
  56
  57 /*! \internal \brief
  58  * Describes a parsed value, possibly resulting from expression evaluation.
  59  */
  60 typedef struct t_selexpr_value
  61 {
  62     /** Type of the value. */
  63     e_selvalue_t            type;
  64     /** TRUE if the value is the result of an expression. */
  65     bool                    bExpr;
  66     union {
  67         /** The integer value/range (\p type INT_VALUE); */
  68         struct {
  69             /** Beginning of the range. */
  70             int             i1;
  71             /** End of the range; equals \p i1 for a single integer. */
  72             int             i2;
  73         }                   i;
  74         /** The real value/range (\p type REAL_VALUE); */
  75         struct {
  76             /** Beginning of the range. */
  77             real            r1;
  78             /** End of the range; equals \p r1 for a single number. */
  79             real            r2;
  80         }                   r;
  81         /** The string value (\p type STR_VALUE); */
  82         char               *s;
  83         /** The position value (\p type POS_VALUE); */
  84         rvec                x;
  85         /** The expression if \p bExpr is TRUE. */
  86         struct t_selelem   *expr;
  87     }                       u;
  88     /** Pointer to the next value. */
  89     struct t_selexpr_value *next;
  90 } t_selexpr_value;
  91
  92 /*! \internal \brief
  93  * Describes a parsed method parameter.
  94  */
  95 typedef struct t_selexpr_param
  96 {
  97     /** Name of the parameter. */
  98     char                   *name;
  99     /** Number of values given for this parameter. */
 100     int                     nval;
 101     /** Pointer to the first value. */
 102     struct t_selexpr_value *value;
 103     /** Pointer to the next parameter. */
 104     struct t_selexpr_param *next;
 105 } t_selexpr_param;
 106
 107 /** Error reporting function for the selection parser. */
 108 void
 109 _gmx_selparser_error(const char *fmt, ...);
 110
 111 /** Allocates and initializes a constant \c t_selexpr_value. */
 112 t_selexpr_value *
 113 _gmx_selexpr_create_value(e_selvalue_t type);
 114 /** Allocates and initializes an expression \c t_selexpr_value. */
 115 t_selexpr_value *
 116 _gmx_selexpr_create_value_expr(struct t_selelem *expr);
 117 /** Allocates and initializes a \c t_selexpr_param. */
 118 t_selexpr_param *
 119 _gmx_selexpr_create_param(char *name);
 120
 121 /** Frees the memory allocated for a chain of values. */
 122 void
 123 _gmx_selexpr_free_values(t_selexpr_value *value);
 124 /** Frees the memory allocated for a chain of parameters. */
 125 void
 126 _gmx_selexpr_free_params(t_selexpr_param *param);
 127
 128 /** Propagates the flags for selection elements. */
 129 int
 130 _gmx_selelem_update_flags(struct t_selelem *sel);
 131
 132 /** Creates a \c t_selelem for comparsion expression evaluation. */
 133 struct t_selelem *
 134 _gmx_sel_init_comparison(struct t_selelem *left, struct t_selelem *right,
 135                          char *cmpop, void *scanner);
 136 /** Creates a \c t_selelem for a keyword expression from the parsed data. */
 137 struct t_selelem *
 138 _gmx_sel_init_keyword(struct gmx_ana_selmethod_t *method,
 139                       t_selexpr_value *args, const char *rpost, void *scanner);
 140 /** Creates a \c t_selelem for a method expression from the parsed data. */
 141 struct t_selelem *
 142 _gmx_sel_init_method(struct gmx_ana_selmethod_t *method,
 143                      t_selexpr_param *params, const char *rpost,
 144                      void *scanner);
 145 /** Creates a \c t_selelem for a modifier expression from the parsed data. */
 146 struct t_selelem *
 147 _gmx_sel_init_modifier(struct gmx_ana_selmethod_t *mod, t_selexpr_param *params,
 148                        struct t_selelem *sel, void *scanner);
 149 /** Creates a \c t_selelem for evaluation of reference positions. */
 150 struct t_selelem *
 151 _gmx_sel_init_position(struct t_selelem *expr, const char *type, void *scanner);
 152
 153 /** Creates a \c t_selelem for a constant position. */
 154 struct t_selelem *
 155 _gmx_sel_init_const_position(real x, real y, real z);
 156 /** Creates a \c t_selelem for a index group expression using group name. */
 157 struct t_selelem *
 158 _gmx_sel_init_group_by_name(const char *name, void *scanner);
 159 /** Creates a \c t_selelem for a index group expression using group index. */
 160 struct t_selelem *
 161 _gmx_sel_init_group_by_id(int id, void *scanner);
 162 /** Creates a \c t_selelem for a variable reference */
 163 struct t_selelem *
 164 _gmx_sel_init_variable_ref(struct t_selelem *sel);
 165
 166 /** Creates a root \c t_selelem for a selection. */
 167 struct t_selelem *
 168 _gmx_sel_init_selection(char *name, struct t_selelem *sel, void *scanner);
 169 /** Creates a root \c t_selelem elements for a variable assignment. */
 170 struct t_selelem *
 171 _gmx_sel_assign_variable(char *name, struct t_selelem *expr, void *scanner);
 172 /** Appends a root \c t_selelem to a selection collection. */
 173 struct t_selelem *
 174 _gmx_sel_append_selection(struct t_selelem *sel, struct t_selelem *last,
 175                           void *scanner);
 176 /** Check whether the parser should finish. */
 177 bool
 178 _gmx_sel_parser_should_finish(void *scanner);
 179
 180 /** Handle empty commands. */
 181 void
 182 _gmx_sel_handle_empty_cmd(void *scanner);
 183 /** Process help commands. */
 184 void
 185 _gmx_sel_handle_help_cmd(char *topic, void *scanner);
 186
 187 /* In params.c */
 188 /** Initializes an array of parameters based on input from the selection parser. */
 189 bool
 190 _gmx_sel_parse_params(t_selexpr_param *pparams, int nparam,
 191                       struct gmx_ana_selparam_t *param, struct t_selelem *root,
 192                       void *scanner);
 193
 194 #endif