don't even try heavily penalized searches

[nominatim.git] / module / nominatim.c

diff --git a/module/nominatim.c b/module/nominatim.c
index 155531530082013c76137d9556124d148f8faa6b..54632f76d03e4bffe9a7ddebc2cb8ced6f3413e0 100644 (file)
--- a/module/nominatim.c
+++ b/module/nominatim.c
@@ -1,12 +1,22 @@
+/**
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * This file is part of Nominatim. (https://nominatim.org)
+ *
+ * Copyright (C) 2022 by the Nominatim developer community.
+ * For a full list of authors see the git log.
+ */

 #include "postgres.h"
 #include "fmgr.h"
 #include "mb/pg_wchar.h"
 #include <utfasciitable.h>
 
 #include "postgres.h"
 #include "fmgr.h"
 #include "mb/pg_wchar.h"
 #include <utfasciitable.h>
 

-#ifdef PG_MODULE_MAGIC
-PG_MODULE_MAGIC;
+#if PG_MAJORVERSION_NUM > 15
+#include "varatt.h"

 #endif
 
 #endif
 

+PG_MODULE_MAGIC;
+

 Datum transliteration( PG_FUNCTION_ARGS );
 Datum gettokenstring( PG_FUNCTION_ARGS );
 void str_replace(char* buffer, int* len, int* changes, char* from, int fromlen, char* to, int tolen, int);
 Datum transliteration( PG_FUNCTION_ARGS );
 Datum gettokenstring( PG_FUNCTION_ARGS );
 void str_replace(char* buffer, int* len, int* changes, char* from, int fromlen, char* to, int tolen, int);


@@ -54,7 +64,8 @@ transliteration( PG_FUNCTION_ARGS )
        wchardatastart = wchardata = (unsigned int *)palloc((sourcedatalength+1)*sizeof(int));
 
        // Based on pg_utf2wchar_with_len from wchar.c
        wchardatastart = wchardata = (unsigned int *)palloc((sourcedatalength+1)*sizeof(int));
 
        // Based on pg_utf2wchar_with_len from wchar.c

-        while (sourcedatalength > 0 && *sourcedata)
+       // Postgresql strings are not zero terminalted
+        while (sourcedatalength > 0)

         {
                 if ((*sourcedata & 0x80) == 0)
                 {
         {
                 if ((*sourcedata & 0x80) == 0)
                 {


@@ -68,7 +79,7 @@ transliteration( PG_FUNCTION_ARGS )
                         c1 = *sourcedata++ & 0x1f;
                         c2 = *sourcedata++ & 0x3f;
                         *wchardata = (c1 << 6) | c2;
                         c1 = *sourcedata++ & 0x1f;
                         c2 = *sourcedata++ & 0x3f;
                         *wchardata = (c1 << 6) | c2;

-                       wchardata++;
+                       if (*wchardata < 65536) wchardata++;

                         sourcedatalength -= 2;
                 }
                 else if ((*sourcedata & 0xf0) == 0xe0)
                         sourcedatalength -= 2;
                 }
                 else if ((*sourcedata & 0xf0) == 0xe0)


@@ -78,7 +89,7 @@ transliteration( PG_FUNCTION_ARGS )
                         c2 = *sourcedata++ & 0x3f;
                         c3 = *sourcedata++ & 0x3f;
                         *wchardata = (c1 << 12) | (c2 << 6) | c3;
                         c2 = *sourcedata++ & 0x3f;
                         c3 = *sourcedata++ & 0x3f;
                         *wchardata = (c1 << 12) | (c2 << 6) | c3;

-                       wchardata++;
+                       if (*wchardata < 65536) wchardata++;

                         sourcedatalength -= 3;
                 }
                 else if ((*sourcedata & 0xf8) == 0xf0)
                         sourcedatalength -= 3;
                 }
                 else if ((*sourcedata & 0xf8) == 0xf0)


@@ -89,7 +100,7 @@ transliteration( PG_FUNCTION_ARGS )
                         c3 = *sourcedata++ & 0x3f;
                         c4 = *sourcedata++ & 0x3f;
                         *wchardata = (c1 << 18) | (c2 << 12) | (c3 << 6) | c4;
                         c3 = *sourcedata++ & 0x3f;
                         c4 = *sourcedata++ & 0x3f;
                         *wchardata = (c1 << 18) | (c2 << 12) | (c3 << 6) | c4;

-                       wchardata++;
+                       if (*wchardata < 65536) wchardata++;

                         sourcedatalength -= 4;
                 }
                 else if ((*sourcedata & 0xfc) == 0xf8)
                         sourcedatalength -= 4;
                 }
                 else if ((*sourcedata & 0xfc) == 0xf8)


@@ -97,17 +108,20 @@ transliteration( PG_FUNCTION_ARGS )
                        // table does not extend beyond 4 char long, just skip
                        if (sourcedatalength < 5) break;
                        sourcedatalength -= 5;
                        // table does not extend beyond 4 char long, just skip
                        if (sourcedatalength < 5) break;
                        sourcedatalength -= 5;

+                       sourcedata += 5;

                }
                 else if ((*sourcedata & 0xfe) == 0xfc)
                 {
                        // table does not extend beyond 4 char long, just skip
                        if (sourcedatalength < 6) break;
                        sourcedatalength -= 6;
                }
                 else if ((*sourcedata & 0xfe) == 0xfc)
                 {
                        // table does not extend beyond 4 char long, just skip
                        if (sourcedatalength < 6) break;
                        sourcedatalength -= 6;

+                       sourcedata += 6;

                }
                 else
                 {
                        // assume lenngth 1, silently drop bogus characters
                         sourcedatalength--;
                }
                 else
                 {
                        // assume lenngth 1, silently drop bogus characters
                         sourcedatalength--;

+                       sourcedata += 1;

                 }
         }
         *wchardata = 0;
                 }
         }
         *wchardata = 0;


@@ -139,12 +153,12 @@ transliteration( PG_FUNCTION_ARGS )
                                resultdata++;
                        }
                }
                                resultdata++;
                        }
                }

-               else
+               /*else

                {
                        ereport( WARNING, ( errcode( ERRCODE_SUCCESSFUL_COMPLETION ),
                              errmsg( "missing char: %i\n", *wchardata )));
                        
                {
                        ereport( WARNING, ( errcode( ERRCODE_SUCCESSFUL_COMPLETION ),
                              errmsg( "missing char: %i\n", *wchardata )));
                        

-               }
+               }*/

                wchardata++;
        }
 
                wchardata++;
        }
 


@@ -153,17 +167,18 @@ transliteration( PG_FUNCTION_ARGS )
        PG_RETURN_TEXT_P(result);
 }
 
        PG_RETURN_TEXT_P(result);
 }
 

+// Set isspace=1 if the replacement _only_ adds a space before the search string.  I.e. to == " " + from

 void str_replace(char* buffer, int* len, int* changes, char* from, int fromlen, char* to, int tolen, int isspace)
 {
         char *p;
 
 void str_replace(char* buffer, int* len, int* changes, char* from, int fromlen, char* to, int tolen, int isspace)
 {
         char *p;
 

-        // Search string is too long to be pressent
+        // Search string is too long to be present

         if (fromlen > *len) return;
 
         p = strstr(buffer, from);
         while(p)
         {
         if (fromlen > *len) return;
 
         p = strstr(buffer, from);
         while(p)
         {

-                if (!isspace || *(p-1) != ' ')
+                if (!isspace || (p > buffer && *(p-1) != ' '))

                 {
                         (*changes)++;
                         if (tolen != fromlen) memmove(p+tolen, p+fromlen, *len-(p-buffer)+1);
                 {
                         (*changes)++;
                         if (tolen != fromlen) memmove(p+tolen, p+fromlen, *len-(p-buffer)+1);


@@ -226,7 +241,7 @@ gettokenstring( PG_FUNCTION_ARGS )
        sourcedata = (unsigned char *)VARDATA(source);
        sourcedatalength = VARSIZE(source) - VARHDRSZ;
 
        sourcedata = (unsigned char *)VARDATA(source);
        sourcedatalength = VARSIZE(source) - VARHDRSZ;
 

-       // Buffer for doing the replace in - string could get slightly longer (double is mastive overkill)
+       // Buffer for doing the replace in - string could get slightly longer (double is massive overkill)

        buffer = (char *)palloc((sourcedatalength*2)*sizeof(char));
        memcpy(buffer+1, sourcedata, sourcedatalength);
        buffer[0] = 32;
        buffer = (char *)palloc((sourcedatalength*2)*sizeof(char));
        memcpy(buffer+1, sourcedata, sourcedatalength);
        buffer[0] = 32;


@@ -248,7 +263,6 @@ gettokenstring( PG_FUNCTION_ARGS )
        str_replace(buffer, &len, &changes, " und ", 5, " ", 1, 0);
        str_replace(buffer, &len, &changes, " en ", 4, " ", 1, 0);
        str_replace(buffer, &len, &changes, " et ", 4, " ", 1, 0);
        str_replace(buffer, &len, &changes, " und ", 5, " ", 1, 0);
        str_replace(buffer, &len, &changes, " en ", 4, " ", 1, 0);
        str_replace(buffer, &len, &changes, " et ", 4, " ", 1, 0);

-       str_replace(buffer, &len, &changes, " e ", 3, " ", 1, 0);

        str_replace(buffer, &len, &changes, " y ", 3, " ", 1, 0);
 
        // 'the' (and similar)
        str_replace(buffer, &len, &changes, " y ", 3, " ", 1, 0);
 
        // 'the' (and similar)