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/* MI Command Set - MI parser.

   Copyright (C) 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.

   Contributed by Cygnus Solutions (a Red Hat company).

   This file is part of GDB.

   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/>.  */

#include "defs.h"

#include "mi-cmds.h"

#include "mi-parse.h"

#include <ctype.h>

#include "gdb_string.h"

static void

mi_parse_argv (char *args, struct mi_parse *parse)

{

  char *chp = args;

  int argc = 0;

  char **argv = xmalloc ((argc + 1) * sizeof (char *));

  argv[argc] = NULL;

  while (1)

    {

      char *arg;

      /* skip leading white space */

      while (isspace (*chp))

        chp++;

      /* Three possibilities: EOF, quoted string, or other text. */

      switch (*chp)

        {

        case '\0':

          parse->argv = argv;

          parse->argc = argc;

          return;

        case '"':

          {

            /* A quoted string. */

            int len;

            char *start = chp + 1;

            /* Determine the buffer size. */

            chp = start;

            len = 0;

            while (*chp != '\0' && *chp != '"')

              {

                if (*chp == '\\')

                  {

                    chp++;

                    if (parse_escape (&chp) <= 0)

                      {

                        /* Do not allow split lines or "\000" */

                        freeargv (argv);

                        return;

                      }

                  }

                else

                  chp++;

                len++;

              }

            /* Insist on a closing quote. */

            if (*chp != '"')

              {

                freeargv (argv);

                return;

              }

            /* Insist on trailing white space. */

            if (chp[1] != '\0' && !isspace (chp[1]))

              {

                freeargv (argv);

                return;

              }

            /* create the buffer. */

            arg = xmalloc ((len + 1) * sizeof (char));

            /* And copy the characters in. */

            chp = start;

            len = 0;

            while (*chp != '\0' && *chp != '"')

              {

                if (*chp == '\\')

                  {

                    chp++;

                    arg[len] = parse_escape (&chp);

                  }

                else

                  arg[len] = *chp++;

                len++;

              }

            arg[len] = '\0';

            chp++;              /* that closing quote. */

            break;

          }

        default:

          {

            /* An unquoted string.  Accumulate all non blank

               characters into a buffer. */

            int len;

            char *start = chp;

            while (*chp != '\0' && !isspace (*chp))

              {

                chp++;

              }

            len = chp - start;

            arg = xmalloc ((len + 1) * sizeof (char));

            strncpy (arg, start, len);

            arg[len] = '\0';

            break;

          }

        }

      /* Append arg to argv. */

      argv = xrealloc (argv, (argc + 2) * sizeof (char *));

      argv[argc++] = arg;

      argv[argc] = NULL;

    }

}

void

mi_parse_free (struct mi_parse *parse)

{

  if (parse == NULL)

    return;

  if (parse->command != NULL)

    xfree (parse->command);

  if (parse->token != NULL)

    xfree (parse->token);

  if (parse->args != NULL)

    xfree (parse->args);

  if (parse->argv != NULL)

    freeargv (parse->argv);

  xfree (parse);

}

struct mi_parse *

mi_parse (char *cmd)

{

  char *chp;

  struct mi_parse *parse = XMALLOC (struct mi_parse);

  memset (parse, 0, sizeof (*parse));

  /* Before starting, skip leading white space. */

  while (isspace (*cmd))

    cmd++;

  /* Find/skip any token and then extract it. */

  for (chp = cmd; *chp >= '0' && *chp <= '9'; chp++)

    ;

  parse->token = xmalloc ((chp - cmd + 1) * sizeof (char *));

  memcpy (parse->token, cmd, (chp - cmd));

  parse->token[chp - cmd] = '\0';

  /* This wasn't a real MI command.  Return it as a CLI_COMMAND. */

  if (*chp != '-')

    {

      while (isspace (*chp))

        chp++;

      parse->command = xstrdup (chp);

      parse->op = CLI_COMMAND;

      return parse;

    }

  /* Extract the command. */

  {

    char *tmp = chp + 1;        /* discard ``-'' */

    for (; *chp && !isspace (*chp); chp++)

      ;

    parse->command = xmalloc ((chp - tmp + 1) * sizeof (char *));

    memcpy (parse->command, tmp, chp - tmp);

    parse->command[chp - tmp] = '\0';

  }

  /* Find the command in the MI table. */

  parse->cmd = mi_lookup (parse->command);

  if (parse->cmd == NULL)

    {

      /* FIXME: This should be a function call. */

      fprintf_unfiltered

        (raw_stdout,

         "%s^error,msg=\"Undefined MI command: %s\"\n",

         parse->token, parse->command);

      mi_parse_free (parse);

      return NULL;

    }

  /* Skip white space following the command. */

  while (isspace (*chp))

    chp++;

  /* For new argv commands, attempt to return the parsed argument

     list. */

  if (parse->cmd->argv_func != NULL)

    {

      mi_parse_argv (chp, parse);

      if (parse->argv == NULL)

        {

          /* FIXME: This should be a function call. */

          fprintf_unfiltered

            (raw_stdout,

             "%s^error,msg=\"Problem parsing arguments: %s %s\"\n",

             parse->token, parse->command, chp);

          mi_parse_free (parse);

          return NULL;

        }

    }

  /* FIXME: DELETE THIS */

  /* For CLI and old ARGS commands, also return the remainder of the

     command line as a single string. */

  if (parse->cmd->args_func != NULL

      || parse->cmd->cli.cmd != NULL)

    {

      parse->args = xstrdup (chp);

    }

  /* Fully parsed. */

  parse->op = MI_COMMAND;

  return parse;

}