src/language/command.h

   1 /* PSPP - a program for statistical analysis.
   2    Copyright (C) 1997-9, 2000, 2006, 2010, 2013 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
  16
  17 #ifndef COMMAND_H
  18 #define COMMAND_H 1
  19
  20 #include <stdbool.h>
  21
  22 /* Command return values. */
  23 enum cmd_result
  24   {
  25     /* Successful return values. */
  26     CMD_SUCCESS = 1,            /* Successfully parsed and executed. */
  27     CMD_EOF = 2,                /* End of input. */
  28     CMD_FINISH = 3,             /* FINISH was executed. */
  29
  30     /* Successful return values returned by specific commands to let INPUT
  31        PROGRAM function properly. */
  32     CMD_DATA_LIST,
  33     CMD_END_CASE,
  34     CMD_END_FILE,
  35
  36     /* Various kinds of failures. */
  37     CMD_FAILURE = -1,           /* Not executed at all. */
  38     CMD_NOT_IMPLEMENTED = -2,   /* Command not implemented. */
  39     CMD_CASCADING_FAILURE = -3  /* Serious error: don't continue. */
  40   };
  41
  42 bool cmd_result_is_success (enum cmd_result);
  43 bool cmd_result_is_failure (enum cmd_result);
  44
  45 /* Command processing state. */
  46 enum cmd_state
  47   {
  48     CMD_STATE_INITIAL,          /* No active dataset yet defined. */
  49     CMD_STATE_DATA,             /* Active dataset has been defined. */
  50     CMD_STATE_INPUT_PROGRAM,    /* Inside INPUT PROGRAM. */
  51     CMD_STATE_FILE_TYPE         /* Inside FILE TYPE. */
  52   };
  53
  54 struct dataset;
  55 struct lexer;
  56
  57 enum cmd_result cmd_parse_in_state (struct lexer *lexer, struct dataset *ds,
  58                                     enum cmd_state);
  59
  60 enum cmd_result cmd_parse (struct lexer *lexer, struct dataset *ds);
  61
  62 struct command;
  63 const char *cmd_complete (const char *, const struct command **);
  64
  65 struct dataset;
  66
  67 /* Prototype all the command functions. */
  68 #define DEF_CMD(STATES, FLAGS, NAME, FUNCTION) int FUNCTION (struct lexer *, struct dataset *);
  69 #define UNIMPL_CMD(NAME, DESCRIPTION)
  70 #include "command.def"
  71 #undef DEF_CMD
  72 #undef UNIMPL_CMD
  73
  74 #endif /* command.h */