postgresql/contrib/tsearch/parser.l

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%{
#include "postgres.h"
#include "deflex.h"
#include "parser.h"
/* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
#define fprintf(file, fmt, msg) ereport(ERROR, (errmsg_internal("%s", msg)))
char *token = NULL; /* pointer to token */
char *s = NULL; /* to return WHOLE hyphenated-word */
YY_BUFFER_STATE buf = NULL; /* buffer to parse; it need for parse from string */
%}
%option 8bit
%option never-interactive
%option nodefault
%option nounput
%option noyywrap
/* parser's state for parsing hyphenated-word */
%x DELIM
/* parser's state for parsing URL*/
%x URL
%x SERVER
/* parser's state for parsing TAGS */
%x INTAG
%x QINTAG
%x INCOMMENT
%x INSCRIPT
/* cyrillic koi8 char */
CYRALNUM [0-9\200-\377]
CYRALPHA [\200-\377]
ALPHA [a-zA-Z\200-\377]
ALNUM [0-9a-zA-Z\200-\377]
HOSTNAME ([-_[:alnum:]]+\.)+[[:alpha:]]+
URI [-_[:alnum:]/%,\.;=&?#]+
%%
"<"[Ss][Cc][Rr][Ii][Pp][Tt] { BEGIN INSCRIPT; }
<INSCRIPT>"</"[Ss][Cc][Rr][Ii][Pp][Tt]">" {
BEGIN INITIAL;
*tsearch_yytext=' '; *(tsearch_yytext+1) = '\0';
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return SPACE;
}
"<!--" { BEGIN INCOMMENT; }
<INCOMMENT>"-->" {
BEGIN INITIAL;
*tsearch_yytext=' '; *(tsearch_yytext+1) = '\0';
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return SPACE;
}
"<"[\![:alpha:]] { BEGIN INTAG; }
"</"[[:alpha:]] { BEGIN INTAG; }
<INTAG>"\"" { BEGIN QINTAG; }
<QINTAG>"\\\"" ;
<QINTAG>"\"" { BEGIN INTAG; }
<INTAG>">" {
BEGIN INITIAL;
token = tsearch_yytext;
*tsearch_yytext=' ';
token = tsearch_yytext;
tokenlen = 1;
return TAG;
}
<QINTAG,INTAG,INCOMMENT,INSCRIPT>.|\n ;
\&(quot|amp|nbsp|lt|gt)\; {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return HTMLENTITY;
}
\&\#[0-9][0-9]?[0-9]?\; {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return HTMLENTITY;
}
[-_\.[:alnum:]]+@{HOSTNAME} /* Emails */ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return EMAIL;
}
[+-]?[0-9]+(\.[0-9]+)?[eEdD][+-]?[0-9]+ /* float */ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return SCIENTIFIC;
}
[0-9]+\.[0-9]+\.[0-9\.]*[0-9] {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return VERSIONNUMBER;
}
[+-]?[0-9]+\.[0-9]+ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return DECIMAL;
}
[+-][0-9]+ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return SIGNEDINT;
}
<DELIM,INITIAL>[0-9]+ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return UNSIGNEDINT;
}
http"://" {
BEGIN URL;
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return HTTP;
}
ftp"://" {
BEGIN URL;
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return HTTP;
}
<URL,INITIAL>{HOSTNAME}[/:]{URI} {
BEGIN SERVER;
if (s) { free(s); s=NULL; }
s = strdup( tsearch_yytext );
tokenlen = tsearch_yyleng;
yyless( 0 );
token = s;
return FURL;
}
<SERVER,URL,INITIAL>{HOSTNAME} {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return HOST;
}
<SERVER>[/:]{URI} {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return URI;
}
[[:alnum:]\./_-]+"/"[[:alnum:]\./_-]+ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return FILEPATH;
}
({CYRALPHA}+-)+{CYRALPHA}+ /* composite-word */ {
BEGIN DELIM;
if (s) { free(s); s=NULL; }
s = strdup( tsearch_yytext );
tokenlen = tsearch_yyleng;
yyless( 0 );
token = s;
return CYRHYPHENWORD;
}
([[:alpha:]]+-)+[[:alpha:]]+ /* composite-word */ {
BEGIN DELIM;
if (s) { free(s); s=NULL; }
s = strdup( tsearch_yytext );
tokenlen = tsearch_yyleng;
yyless( 0 );
token = s;
return LATHYPHENWORD;
}
({ALNUM}+-)+{ALNUM}+ /* composite-word */ {
BEGIN DELIM;
if (s) { free(s); s=NULL; }
s = strdup( tsearch_yytext );
tokenlen = tsearch_yyleng;
yyless( 0 );
token = s;
return HYPHENWORD;
}
<DELIM>\+?[0-9]+\.[0-9]+ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return DECIMAL;
}
<DELIM>{CYRALPHA}+ /* one word in composite-word */ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return CYRPARTHYPHENWORD;
}
<DELIM>[[:alpha:]]+ /* one word in composite-word */ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return LATPARTHYPHENWORD;
}
<DELIM>{ALNUM}+ /* one word in composite-word */ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return PARTHYPHENWORD;
}
<DELIM>- {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return SPACE;
}
<DELIM,SERVER,URL>.|\n /* return in basic state */ {
BEGIN INITIAL;
yyless( 0 );
}
{CYRALPHA}+ /* normal word */ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return CYRWORD;
}
[[:alpha:]]+ /* normal word */ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return LATWORD;
}
{ALNUM}+ /* normal word */ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return UWORD;
}
[ \r\n\t]+ {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return SPACE;
}
. {
token = tsearch_yytext;
tokenlen = tsearch_yyleng;
return SPACE;
}
%%
/* clearing after parsing from string */
void end_parse() {
if (s) { free(s); s=NULL; }
tsearch_yy_delete_buffer( buf );
buf = NULL;
}
/* start parse from string */
void start_parse_str(char* str, int limit) {
if (buf) end_parse();
buf = tsearch_yy_scan_bytes( str, limit );
tsearch_yy_switch_to_buffer( buf );
BEGIN INITIAL;
}