/*
Copyright © 1998. The Regents of the University of California (Regents). 
All Rights Reserved.

Written by Matt Wright, The Center for New Music and Audio Technologies,
University of California, Berkeley.

Permission to use, copy, modify, distribute, and distribute modified versions
of this software and its documentation without fee and without a signed
licensing agreement, is hereby granted, provided that the above copyright
notice, this paragraph and the following two paragraphs appear in all copies,
modifications, and distributions.

IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE
MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

The OpenSound Control WWW page is 
    http://www.cnmat.berkeley.edu/OpenSoundControl
*/



/*
    OSC-pattern-match.c
    Matt Wright, 3/16/98
    Adapted from oscpattern.c, by Matt Wright and Amar Chaudhury
 */

#include <libOSC/OSC-common.h>
#include <libOSC/OSC-pattern-match.h>

static const char *theWholePattern;	/* Just for warning messages */

static Boolean MatchBrackets (const char *pattern, const char *test);
static Boolean MatchList (const char *pattern, const char *test);

Boolean PatternMatch (const char *  pattern, const char * test) {
  theWholePattern = pattern;
  
  if (pattern == 0 || pattern[0] == 0) {
    return test[0] == 0;
  } 
  
  if (test[0] == 0) {
    if (pattern[0] == '*')
      return PatternMatch (pattern+1,test);
    else
      return FALSE;
  }

  switch (pattern[0]) {
    case 0      : return test[0] == 0;
    case '?'    : return PatternMatch (pattern + 1, test + 1);
    case '*'    : 
      if (PatternMatch (pattern+1, test)) {
        return TRUE;
      } else {
	return PatternMatch (pattern, test+1);
      }
    case ']'    :
    case '}'    :
      OSCWarning("Spurious %c in pattern \".../%s/...\"",pattern[0], theWholePattern);
      return FALSE;
    case '['    :
      return MatchBrackets (pattern,test);
    case '{'    :
      return MatchList (pattern,test);
    case '\\'   :  
      if (pattern[1] == 0) {
	return test[0] == 0;
      } else if (pattern[1] == test[0]) {
	return PatternMatch (pattern+2,test+1);
      } else {
	return FALSE;
      }
    default     :
      if (pattern[0] == test[0]) {
	return PatternMatch (pattern+1,test+1);
      } else {
	return FALSE;
      }
  }
}


/* we know that pattern[0] == '[' and test[0] != 0 */

static Boolean MatchBrackets (const char *pattern, const char *test) {
  Boolean result;
  Boolean negated = FALSE;
  const char *p = pattern;

  if (pattern[1] == 0) {
    OSCWarning("Unterminated [ in pattern \".../%s/...\"", theWholePattern);
    return FALSE;
  }

  if (pattern[1] == '!') {
    negated = TRUE;
    p++;
  }

  while (*p != ']') {
    if (*p == 0) {
      OSCWarning("Unterminated [ in pattern \".../%s/...\"", theWholePattern);
      return FALSE;
    }
    if (p[1] == '-' && p[2] != 0) {
      if (test[0] >= p[0] && test[0] <= p[2]) {
	result = !negated;
	goto advance;
      }
    }
    if (p[0] == test[0]) {
      result = !negated;
      goto advance;
    }
    p++;
  }

  result = negated;

advance:

  if (!result)
    return FALSE;

  while (*p != ']') {
    if (*p == 0) {
      OSCWarning("Unterminated [ in pattern \".../%s/...\"", theWholePattern);
      return FALSE;
    }
    p++;
  }

  return PatternMatch (p+1,test+1);
}

static Boolean MatchList (const char *pattern, const char *test) {

 const char *restOfPattern, *tp = test;


 for(restOfPattern = pattern; *restOfPattern != '}'; restOfPattern++) {
   if (*restOfPattern == 0) {
     OSCWarning("Unterminated { in pattern \".../%s/...\"", theWholePattern);
     return FALSE;
   }
 }

 restOfPattern++; /* skip close curly brace */


 pattern++; /* skip open curly brace */

 while (1) {
   
   if (*pattern == ',') {
     if (PatternMatch (restOfPattern, tp)) {
       return TRUE;
     } else {
       tp = test;
       ++pattern;
     }
   } else if (*pattern == '}') {
     return PatternMatch (restOfPattern, tp);
   } else if (*pattern == *tp) {
     ++pattern;
     ++tp;
   } else {
     tp = test;
     while (*pattern != ',' && *pattern != '}') {
       pattern++;
     }
     if (*pattern == ',') {
       pattern++;
     }
   }
 }

}



