xml.c:

  new file

strings/xml.c

+/* Copyright (C) 2000 MySQL AB
+
+   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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include "my_global.h"
+#include "m_string.h"
+#include "my_xml.h"
+
+
+#define MY_XML_EOF	'E'
+#define MY_XML_STRING	'S'
+#define MY_XML_IDENT	'I'
+#define MY_XML_EQ	'='
+#define MY_XML_LT	'<'
+#define MY_XML_GT	'>'
+#define MY_XML_SLASH	'/'
+#define MY_XML_COMMENT	'C'
+#define MY_XML_TEXT	'T'
+#define MY_XML_QUESTION	'?'
+#define MY_XML_EXCLAM   '!'
+
+typedef struct xml_attr_st
+{
+  const char *beg;
+  const char *end;
+} MY_XML_ATTR;
+
+static const char *lex2str(int lex)
+{
+  switch(lex)
+  {
+    case MY_XML_EOF:      return "EOF";
+    case MY_XML_STRING:   return "STRING";
+    case MY_XML_IDENT:    return "IDENT";
+    case MY_XML_EQ:       return "'='";
+    case MY_XML_LT:       return "'<'";
+    case MY_XML_GT:       return "'>'";
+    case MY_XML_SLASH:    return "'/'";
+    case MY_XML_COMMENT:  return "COMMENT";
+    case MY_XML_TEXT:     return "TEXT";
+    case MY_XML_QUESTION: return "'?'";
+    case MY_XML_EXCLAM:   return "'!'";
+  }
+  return "UNKNOWN";
+}
+
+static void my_xml_norm_text(MY_XML_ATTR *a)
+{
+  for ( ; (a->beg < a->end) && strchr(" \t\r\n",a->beg[0]) ; a->beg++ );
+  for ( ; (a->beg < a->end) && strchr(" \t\r\n",a->end[-1]) ; a->end-- );
+}
+
+
+static int my_xml_scan(MY_XML_PARSER *p,MY_XML_ATTR *a)
+{
+  int lex;
+  
+  for(  ; ( p->cur < p->end) && strchr(" \t\r\n",p->cur[0]) ;  p->cur++);
+  
+  if (p->cur >= p->end)
+  {
+    a->beg=p->end;
+    a->end=p->end;
+    lex=MY_XML_EOF;
+    goto ret;
+  }
+  
+  a->beg=p->cur;
+  a->end=p->cur;
+  
+  if (!memcmp(p->cur,"<!--",4))
+  {
+    for( ; (p->cur < p->end) && memcmp(p->cur, "-->", 3); p->cur++);
+    if(!memcmp(p->cur, "-->", 3))
+      p->cur+=3;
+    a->end=p->cur;
+    lex=MY_XML_COMMENT;
+  }
+  else if (strchr("?=/<>!",p->cur[0]))
+  {
+    p->cur++;
+    a->end=p->cur;
+    lex=a->beg[0];
+  }
+  else if ( (p->cur[0]=='"') || (p->cur[0]=='\'') )
+  {
+    p->cur++;
+    for(  ; ( p->cur < p->end ) && (p->cur[0]!=a->beg[0]); p->cur++);
+    a->end=p->cur;
+    if (a->beg[0]==p->cur[0])p->cur++;
+    a->beg++;
+    my_xml_norm_text(a);
+    lex=MY_XML_STRING;
+  }
+  else
+  {
+    for( ; (p->cur < p->end) && !strchr("?'\"=/<> \t\r\n", p->cur[0]); p->cur++);
+    a->end=p->cur;
+    my_xml_norm_text(a);
+    lex=MY_XML_IDENT;
+  }
+
+#if 0
+  printf("LEX=%s[%d]\n",lex2str(lex),a->end-a->beg);
+#endif
+
+ret:
+  return lex;
+}
+
+
+static int my_xml_value(MY_XML_PARSER *st, const char *str, uint len)
+{
+  return (st->value) ? (st->value)(st,str,len) : MY_XML_OK;
+}
+
+
+static int my_xml_enter(MY_XML_PARSER *st, const char *str, uint len)
+{
+  if ( (st->attrend-st->attr+len+1)>sizeof(st->attr))
+  {
+    sprintf(st->errstr,"To deep XML");
+    return MY_XML_ERROR;
+  }
+  if (st->attrend > st->attr)
+  {
+    st->attrend[0]='.';
+    st->attrend++;
+  }
+  memcpy(st->attrend,str,len);
+  st->attrend+=len;
+  st->attrend[0]='\0';
+  return st->enter ? st->enter(st,st->attr,st->attrend-st->attr) : MY_XML_OK;
+}
+
+static void mstr(char *s,const char *src,uint l1, uint l2)
+{
+  l1 = l1<l2 ? l1 : l2;
+  memcpy(s,src,l1);
+  s[l1]='\0';
+}
+
+static int my_xml_leave(MY_XML_PARSER *p, const char *str, uint slen)
+{
+  char *e;
+  uint glen;
+  char s[32];
+  char g[32];
+  int  rc;
+  
+  /* Find previous '.' or beginning */
+  for( e=p->attrend; (e>p->attr) && (e[0]!='.') ; e--);
+  glen = (e[0]=='.') ? (p->attrend-e-1) : p->attrend-e;
+  
+  if (str && (slen != glen))
+  {
+    mstr(s,str,sizeof(s)-1,slen);
+    mstr(g,e+1,sizeof(g)-1,glen),
+    sprintf(p->errstr,"'</%s>' unexpected ('</%s>' wanted)",s,g);
+    return MY_XML_ERROR;
+  }
+  
+  rc = p->leave ? p->leave(p,p->attr,p->attrend-p->attr) : MY_XML_OK;
+  
+  *e='\0';
+  p->attrend=e;
+  
+  return rc;
+}
+
+
+int my_xml_parse(MY_XML_PARSER *p,const char *str, uint len)
+{
+  p->attrend=p->attr;
+  p->beg=str;
+  p->cur=str;
+  p->end=str+len;
+  
+  while ( p->cur < p->end )
+  {
+    MY_XML_ATTR a;
+    if(p->cur[0]=='<')
+    {
+      int lex;
+      int question=0;
+      int exclam=0;
+      
+      lex=my_xml_scan(p,&a);
+      
+      if (MY_XML_COMMENT==lex)
+      {
+        continue;
+      }
+      
+      lex=my_xml_scan(p,&a);
+      
+      if (MY_XML_SLASH==lex)
+      {
+        if(MY_XML_IDENT!=(lex=my_xml_scan(p,&a)))
+        {
+          sprintf(p->errstr,"1: %s unexpected (ident wanted)",lex2str(lex));
+          return MY_XML_ERROR;
+        }
+        if(MY_XML_OK!=my_xml_leave(p,a.beg,a.end-a.beg))
+          return MY_XML_ERROR;
+        lex=my_xml_scan(p,&a);
+        goto gt;
+      }
+      
+      if (MY_XML_EXCLAM==lex)
+      {
+        lex=my_xml_scan(p,&a);
+        exclam=1;
+      }
+      else if (MY_XML_QUESTION==lex)
+      {
+        lex=my_xml_scan(p,&a);
+        question=1;
+      }
+      
+      if (MY_XML_IDENT==lex)
+      {
+        if(MY_XML_OK!=my_xml_enter(p,a.beg,a.end-a.beg))
+          return MY_XML_ERROR;
+      }
+      else
+      {
+        sprintf(p->errstr,"3: %s unexpected (ident or '/' wanted)",lex2str(lex));
+        return MY_XML_ERROR;
+      }
+      
+      while ((MY_XML_IDENT==(lex=my_xml_scan(p,&a))) || (MY_XML_STRING==lex))
+      {
+        MY_XML_ATTR b;
+        if(MY_XML_EQ==(lex=my_xml_scan(p,&b)))
+        {
+          lex=my_xml_scan(p,&b);
+          if ( (lex==MY_XML_IDENT) || (lex=MY_XML_STRING) )
+          {
+            if((MY_XML_OK!=my_xml_enter(p,a.beg,a.end-a.beg))  ||
+               (MY_XML_OK!=my_xml_value(p,b.beg,b.end-b.beg))  ||
+               (MY_XML_OK!=my_xml_leave(p,a.beg,a.end-a.beg)))
+              return MY_XML_ERROR;
+          }
+          else
+          {
+            sprintf(p->errstr,"4: %s unexpected (ident or string wanted)",lex2str(lex));
+            return MY_XML_ERROR;
+          }
+        }
+        else if ( (MY_XML_STRING==lex) || (MY_XML_IDENT==lex) )
+        {
+          if((MY_XML_OK!=my_xml_enter(p,a.beg,a.end-a.beg)) ||
+             (MY_XML_OK!=my_xml_leave(p,a.beg,a.end-a.beg)))
+           return MY_XML_ERROR;
+        }
+        else
+          break;
+      }
+      
+      if (lex==MY_XML_SLASH)
+      {
+        if(MY_XML_OK!=my_xml_leave(p,NULL,0))
+          return MY_XML_ERROR;
+        lex=my_xml_scan(p,&a);
+      }
+      
+gt:
+      if (question)
+      {
+        if (lex!=MY_XML_QUESTION)
+        {
+          sprintf(p->errstr,"6: %s unexpected ('?' wanted)",lex2str(lex));
+          return MY_XML_ERROR;
+        }
+        if(MY_XML_OK!=my_xml_leave(p,NULL,0))
+          return MY_XML_ERROR;
+        lex=my_xml_scan(p,&a);
+      }
+      
+      if (exclam)
+      {
+        if(MY_XML_OK!=my_xml_leave(p,NULL,0))
+          return MY_XML_ERROR;
+      }
+      
+      if (lex!=MY_XML_GT)
+      {
+        sprintf(p->errstr,"5: %s unexpected ('>' wanted)",lex2str(lex));
+        return MY_XML_ERROR;
+      }
+    }
+    else
+    {
+      a.beg=p->cur;
+      for ( ; (p->cur < p->end) && (p->cur[0]!='<')  ; p->cur++);
+      a.end=p->cur;
+      
+      my_xml_norm_text(&a);
+      if (a.beg!=a.end)
+      {
+        my_xml_value(p,a.beg,a.end-a.beg);
+      }
+    }
+  }
+  return MY_XML_OK;
+}
+
+void my_xml_parser_create(MY_XML_PARSER *p)
+{
+  bzero((void*)p,sizeof(p[0]));
+}
+
+void my_xml_parser_free(MY_XML_PARSER *p  __attribute__((unused)))
+{
+}
+
+void my_xml_set_value_handler(MY_XML_PARSER *p, int (*action)(MY_XML_PARSER *p, const char *s, uint l))
+{
+  p->value=action;
+}
+
+void my_xml_set_enter_handler(MY_XML_PARSER *p, int (*action)(MY_XML_PARSER *p, const char *s, uint l))
+{
+  p->enter=action;
+}
+
+void my_xml_set_leave_handler(MY_XML_PARSER *p, int (*action)(MY_XML_PARSER *p, const char *s, uint l))
+{
+  p->leave=action;
+}
+
+void my_xml_set_user_data(MY_XML_PARSER *p, void *user_data)
+{
+  p->user_data=user_data;
+}
+
+const char *my_xml_error_string(MY_XML_PARSER *p)
+{
+  return p->errstr;
+}
+
+
+uint my_xml_error_pos(MY_XML_PARSER *p)
+{
+  const char *beg=p->beg;
+  const char *s;
+  for ( s=p->beg ; s<p->cur; s++)
+    if (s[0]=='\n')
+      beg=s;
+  return p->cur-beg;
+}
+
+uint my_xml_error_lineno(MY_XML_PARSER *p)
+{
+  uint res=0;
+  const char *s;
+  for ( s=p->beg ; s<p->cur; s++)
+    if (s[0]=='\n')
+      res++;
+  return res;
+}