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Allow empty replacement strings in contrib/unaccent.

This is useful in languages where diacritic signs are represented asseparate characters; it's also one step towards letting unaccent be usedfor arbitrary substring substitutions.In passing, improve the user documentation for unaccent, which was sadlyvague about some important details.Mohammad Alhashash, reviewed by Abhijit Menon-Sen

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2 files changed

+54

-11

lines changed

contrib/unaccent
- unaccent.c
doc/src/sgml
- unaccent.sgml

2 files changed

+54

-11

lines changed

`‎contrib/unaccent/unaccent.c`

Lines changed: 23 additions & 6 deletions

Original file line number	Diff line number	Diff line change
`@@ -104,11 +104,21 @@ initTrie(char *filename)`
`104`	`104`
`105`	`105`	`while ((line=tsearch_readline(&trst))!=NULL)`
`106`	`106`	`{`
`107`		`-/*`
`108`		`- * The format of each line must be "src trg" where src and trg`
`109`		`- * are sequences of one or more non-whitespace characters,`
`110`		`- * separated by whitespace. Whitespace at start or end of`
`111`		`- * line is ignored.`
	`107`	`+/*----------`
	`108`	`+ * The format of each line must be "src" or "src trg", where`
	`109`	`+ * src and trg are sequences of one or more non-whitespace`
	`110`	`+ * characters, separated by whitespace. Whitespace at start`
	`111`	`+ * or end of line is ignored. If trg is omitted, an empty`
	`112`	`+ * string is used as the replacement.`
	`113`	`+ *`
	`114`	`+ * We use a simple state machine, with states`
	`115`	`+ *0initial (before src)`
	`116`	`+ *1in src`
	`117`	`+ *2in whitespace after src`
	`118`	`+ *3in trg`
	`119`	`+ *4in whitespace after trg`
	`120`	`+ *-1syntax error detected (line will be ignored)`
	`121`	`+ *----------`
`112`	`122`	`*/`
`113`	`123`	`intstate;`
`114`	`124`	`char*ptr;`
`@@ -160,7 +170,14 @@ initTrie(char *filename)`
`160`	`170`	`}`
`161`	`171`	`}`
`162`	`172`
`163`		`-if (state >=3)`
	`173`	`+if (state==1\|\|state==2)`
	`174`	`+{`
	`175`	`+/* trg was omitted, so use "" */`
	`176`	`+trg="";`
	`177`	`+trglen=0;`
	`178`	`+}`
	`179`	`+`
	`180`	`+if (state>0)`
`164`	`181`	`rootTrie=placeChar(rootTrie,`
`165`	`182`	`(unsignedchar*)src,srclen,`
`166`	`183`	`trg,trglen);`

`‎doc/src/sgml/unaccent.sgml`

Lines changed: 31 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -45,9 +45,9 @@`
`45`	`45`	`<itemizedlist>`
`46`	`46`	`<listitem>`
`47`	`47`	`<para>`
`48`		`- Each line representsa pair, consisting of a character with accent`
`49`		`- followed by a character without accent. The first is translated into`
`50`		`- the second. For example,`
	`48`	`+ Each line representsone translation rule, consisting of a character with`
	`49`	`+accentfollowed by a character without accent. The first is translated`
	`50`	`+intothe second. For example,`
`51`	`51`	`<programlisting>`
`52`	`52`	`À A`
`53`	`53`	`Á A`
`@@ -57,6 +57,27 @@`
`57`	`57`	`Å A`
`58`	`58`	`Æ A`
`59`	`59`	`</programlisting>`
	`60`	`+ The two characters must be separated by whitespace, and any leading or`
	`61`	`+ trailing whitespace on a line is ignored.`
	`62`	`+ </para>`
	`63`	`+ </listitem>`
	`64`	`+`
	`65`	`+ <listitem>`
	`66`	`+ <para>`
	`67`	`+ Alternatively, if only one character is given on a line, instances of`
	`68`	`+ that character are deleted; this is useful in languages where accents`
	`69`	`+ are represented by separate characters.`
	`70`	`+ </para>`
	`71`	`+ </listitem>`
	`72`	`+`
	`73`	`+ <listitem>`
	`74`	`+ <para>`
	`75`	`+ As with other <productname>PostgreSQL</> text search configuration files,`
	`76`	`+ the rules file must be stored in UTF-8 encoding. The data is`
	`77`	`+ automatically translated into the current database's encoding when`
	`78`	`+ loaded. Any lines containing untranslatable characters are silently`
	`79`	`+ ignored, so that rules files can contain rules that are not applicable in`
	`80`	`+ the current encoding.`
`60`	`81`	`</para>`
`61`	`82`	`</listitem>`
`62`	`83`	`</itemizedlist>`
`@@ -132,8 +153,8 @@ mydb=# select ts_headline('fr','Hôtel de la Mer',to_tsquery('fr','Hotels')`
`132`	`153`
`133`	`154`	`<para>`
`134`	`155`	`The <function>unaccent()</> function removes accents (diacritic signs) from`
`135`		`- a given string. Basically, it's a wrapper around the`
`136`		`- <filename>unaccent</> dictionary, but it can be used outside normal`
	`156`	`+ a given string. Basically, it's a wrapper around`
	`157`	`+ <filename>unaccent</>-type dictionaries, but it can be used outside normal`
`137`	`158`	`text search contexts.`
`138`	`159`	`</para>`
`139`	`160`
`@@ -145,6 +166,11 @@ mydb=# select ts_headline('fr','Hôtel de la Mer',to_tsquery('fr','Hotels')`
`145`	`166`	`unaccent(<optional><replaceable class="PARAMETER">dictionary</replaceable>, </optional> <replaceable class="PARAMETER">string</replaceable>) returns <type>text</type>`
`146`	`167`	`</synopsis>`
`147`	`168`
	`169`	`+ <para>`
	`170`	`+ If the <replaceable class="PARAMETER">dictionary</replaceable> argument is`
	`171`	`+ omitted, <literal>unaccent</> is assumed.`
	`172`	`+ </para>`
	`173`	`+`
`148`	`174`	`<para>`
`149`	`175`	`For example:`
`150`	`176`	`<programlisting>`

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Commit97c40ce

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`‎contrib/unaccent/unaccent.c`

`‎doc/src/sgml/unaccent.sgml`

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