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nominatim refactoring
This commit is contained in:
Brian Quinion
287
module/nominatim.c
Normal file
287
module/nominatim.c
Normal file
@@ -0,0 +1,287 @@
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#include "postgres.h"
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#include "fmgr.h"
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#include "mb/pg_wchar.h"
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#include <utfasciitable.h>
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#ifdef PG_MODULE_MAGIC
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PG_MODULE_MAGIC;
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#endif
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Datum transliteration( PG_FUNCTION_ARGS );
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Datum gettokenstring( PG_FUNCTION_ARGS );
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void str_replace(char* buffer, int* len, int* changes, char* from, int fromlen, char* to, int tolen, int);
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void str_dupspaces(char* buffer);
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PG_FUNCTION_INFO_V1( transliteration );
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Datum
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transliteration( PG_FUNCTION_ARGS )
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{
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static char * ascii = UTFASCII;
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static uint16 asciilookup[65536] = UTFASCIILOOKUP;
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char * asciipos;
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text *source;
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unsigned char *sourcedata;
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int sourcedatalength;
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unsigned int c1,c2,c3,c4;
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unsigned int * wchardata;
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unsigned int * wchardatastart;
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text *result;
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unsigned char *resultdata;
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int resultdatalength;
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int iLen;
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if (GetDatabaseEncoding() != PG_UTF8)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("requires UTF8 database encoding")));
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}
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if (PG_ARGISNULL(0))
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{
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PG_RETURN_NULL();
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}
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// The original string
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source = PG_GETARG_TEXT_P(0);
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sourcedata = (unsigned char *)VARDATA(source);
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sourcedatalength = VARSIZE(source) - VARHDRSZ;
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// Intermediate wchar version of string
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wchardatastart = wchardata = (unsigned int *)palloc((sourcedatalength+1)*sizeof(int));
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// Based on pg_utf2wchar_with_len from wchar.c
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while (sourcedatalength > 0 && *sourcedata)
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{
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if ((*sourcedata & 0x80) == 0)
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{
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*wchardata = *sourcedata++;
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wchardata++;
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sourcedatalength--;
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}
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else if ((*sourcedata & 0xe0) == 0xc0)
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{
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if (sourcedatalength < 2) break;
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c1 = *sourcedata++ & 0x1f;
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c2 = *sourcedata++ & 0x3f;
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*wchardata = (c1 << 6) | c2;
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wchardata++;
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sourcedatalength -= 2;
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}
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else if ((*sourcedata & 0xf0) == 0xe0)
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{
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if (sourcedatalength < 3) break;
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c1 = *sourcedata++ & 0x0f;
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c2 = *sourcedata++ & 0x3f;
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c3 = *sourcedata++ & 0x3f;
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*wchardata = (c1 << 12) | (c2 << 6) | c3;
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wchardata++;
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sourcedatalength -= 3;
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}
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else if ((*sourcedata & 0xf8) == 0xf0)
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{
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if (sourcedatalength < 4) break;
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c1 = *sourcedata++ & 0x07;
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c2 = *sourcedata++ & 0x3f;
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c3 = *sourcedata++ & 0x3f;
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c4 = *sourcedata++ & 0x3f;
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*wchardata = (c1 << 18) | (c2 << 12) | (c3 << 6) | c4;
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wchardata++;
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sourcedatalength -= 4;
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}
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else if ((*sourcedata & 0xfc) == 0xf8)
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{
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// table does not extend beyond 4 char long, just skip
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if (sourcedatalength < 5) break;
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sourcedatalength -= 5;
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}
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else if ((*sourcedata & 0xfe) == 0xfc)
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{
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// table does not extend beyond 4 char long, just skip
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if (sourcedatalength < 6) break;
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sourcedatalength -= 6;
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}
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else
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{
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// assume lenngth 1, silently drop bogus characters
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sourcedatalength--;
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}
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}
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*wchardata = 0;
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// calc the length of transliteration string
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resultdatalength = 0;
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wchardata = wchardatastart;
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while(*wchardata)
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{
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if (*(asciilookup + *wchardata) > 0) resultdatalength += *(ascii + *(asciilookup + *wchardata));
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wchardata++;
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}
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// allocate & create the result
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result = (text *)palloc(resultdatalength + VARHDRSZ);
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SET_VARSIZE(result, resultdatalength + VARHDRSZ);
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resultdata = (unsigned char *)VARDATA(result);
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wchardata = wchardatastart;
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while(*wchardata)
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{
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if (*(asciilookup + *wchardata) > 0)
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{
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asciipos = ascii + *(asciilookup + *wchardata);
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for(iLen = *asciipos; iLen > 0; iLen--)
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{
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asciipos++;
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*resultdata = *asciipos;
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resultdata++;
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}
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}
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else
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{
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ereport( WARNING, ( errcode( ERRCODE_SUCCESSFUL_COMPLETION ),
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errmsg( "missing char: %i\n", *wchardata )));
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}
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wchardata++;
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}
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pfree(wchardatastart);
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PG_RETURN_TEXT_P(result);
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}
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void str_replace(char* buffer, int* len, int* changes, char* from, int fromlen, char* to, int tolen, int isspace)
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{
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char *p;
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// Search string is too long to be pressent
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if (fromlen > *len) return;
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p = strstr(buffer, from);
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while(p)
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{
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if (!isspace || *(p-1) != ' ')
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{
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(*changes)++;
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if (tolen != fromlen) memmove(p+tolen, p+fromlen, *len-(p-buffer)+1);
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memcpy(p, to, tolen);
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*len += tolen - fromlen;
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}
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p = strstr(p+1, from);
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}
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}
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void str_dupspaces(char* buffer)
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{
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char *out;
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int wasspace;
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out = buffer;
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wasspace = 0;
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while(*buffer)
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{
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if (wasspace && *buffer != ' ') wasspace = 0;
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if (!wasspace)
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{
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*out = *buffer;
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out++;
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wasspace = (*buffer == ' ');
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}
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buffer++;
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}
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*out = 0;
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}
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PG_FUNCTION_INFO_V1( gettokenstring );
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Datum
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gettokenstring( PG_FUNCTION_ARGS )
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{
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text *source;
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unsigned char *sourcedata;
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int sourcedatalength;
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char * buffer;
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int len;
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int changes;
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text *result;
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if (GetDatabaseEncoding() != PG_UTF8)
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{
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("requires UTF8 database encoding")));
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}
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if (PG_ARGISNULL(0))
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{
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PG_RETURN_NULL();
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}
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// The original string
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source = PG_GETARG_TEXT_P(0);
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sourcedata = (unsigned char *)VARDATA(source);
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sourcedatalength = VARSIZE(source) - VARHDRSZ;
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// Buffer for doing the replace in - string could get slightly longer (double is mastive overkill)
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buffer = (char *)palloc((sourcedatalength*2)*sizeof(char));
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memcpy(buffer+1, sourcedata, sourcedatalength);
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buffer[0] = 32;
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buffer[sourcedatalength+1] = 32;
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buffer[sourcedatalength+2] = 0;
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len = sourcedatalength+3;
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changes = 1;
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str_dupspaces(buffer);
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while(changes)
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{
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changes = 0;
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#include <tokenstringreplacements.inc>
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str_dupspaces(buffer);
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}
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// 'and' in various languages
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str_replace(buffer, &len, &changes, " and ", 5, " ", 1, 0);
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str_replace(buffer, &len, &changes, " und ", 5, " ", 1, 0);
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str_replace(buffer, &len, &changes, " en ", 4, " ", 1, 0);
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str_replace(buffer, &len, &changes, " et ", 4, " ", 1, 0);
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str_replace(buffer, &len, &changes, " e ", 3, " ", 1, 0);
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str_replace(buffer, &len, &changes, " y ", 3, " ", 1, 0);
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// 'the' (and similar)
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str_replace(buffer, &len, &changes, " the ", 5, " ", 1, 0);
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str_replace(buffer, &len, &changes, " der ", 5, " ", 1, 0);
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str_replace(buffer, &len, &changes, " den ", 5, " ", 1, 0);
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str_replace(buffer, &len, &changes, " die ", 5, " ", 1, 0);
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str_replace(buffer, &len, &changes, " das ", 5, " ", 1, 0);
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str_replace(buffer, &len, &changes, " la ", 4, " ", 1, 0);
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str_replace(buffer, &len, &changes, " le ", 4, " ", 1, 0);
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str_replace(buffer, &len, &changes, " el ", 4, " ", 1, 0);
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str_replace(buffer, &len, &changes, " il ", 4, " ", 1, 0);
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// german
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str_replace(buffer, &len, &changes, "ae", 2, "a", 1, 0);
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str_replace(buffer, &len, &changes, "oe", 2, "o", 1, 0);
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str_replace(buffer, &len, &changes, "ue", 2, "u", 1, 0);
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str_replace(buffer, &len, &changes, "sss", 3, "ss", 2, 0);
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str_replace(buffer, &len, &changes, "ih", 2, "i", 1, 0);
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str_replace(buffer, &len, &changes, "eh", 2, "e", 1, 0);
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// russian
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str_replace(buffer, &len, &changes, "ie", 2, "i", 1, 0);
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str_replace(buffer, &len, &changes, "yi", 2, "i", 1, 0);
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// allocate & create the result
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len--;// Drop the terminating zero
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result = (text *)palloc(len + VARHDRSZ);
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SET_VARSIZE(result, len + VARHDRSZ);
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memcpy(VARDATA(result), buffer, len);
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pfree(buffer);
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PG_RETURN_TEXT_P(result);
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}
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