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smarty/docs/ru/designers/language-custom-functions/language-function-eval.xml
2005-12-30 15:43:38 +00:00

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<?xml version="1.0" encoding="windows-1251"?>
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<sect1 id="language.function.eval">
<title>{eval}</title>
<para>
{eval} èñïîëüçóåòñÿ äëÿ îáðàáîòêè ïåðåìåííîé, êàê øàáëîíà.
Ìîæíî èñïîëüçîâàòü äëÿ òàêèõ âåùåé, êàê õðàíåíèå øàáëîííûõ
òýãîâ/ïåðåìåííûõ â ïåðåìåííîé èëè â ôàéëàõ êîíôèãðóàöèè.
</para>
<para>
Åñëè óêàçàí ñïåöèàëüíûé àòðèáóò "assign", òî âûâîä òýãà eval
ïðèñâàèâàåòñÿ ïåðåìåííîé, âìåñòî îòîáðàæåíèÿ.
</para>
<informaltable frame="all">
<tgroup cols="5">
<colspec colname="param" align="center" />
<colspec colname="type" align="center" />
<colspec colname="required" align="center" />
<colspec colname="default" align="center" />
<colspec colname="desc" />
<thead>
<row>
<entry>Èìÿ àòðèáóòà</entry>
<entry>Òèï</entry>
<entry>Îáÿçàòåëåí</entry>
<entry>Ïî óìîë÷àíèþ</entry>
<entry>Îïèñàíèå</entry>
</row>
</thead>
<tbody>
<row>
<entry>var</entry>
<entry>mixed</entry>
<entry>Äà</entry>
<entry><emphasis>n/a</emphasis></entry>
<entry>Ïåðåìåííàÿ (èëè ñòðîêà) äëÿ îáðàáîòêè</entry>
</row>
<row>
<entry>assign</entry>
<entry>string</entry>
<entry>Íåò</entry>
<entry><emphasis>n/a</emphasis></entry>
<entry>Èìÿ ïåðåìåííîé, êîòîðîé áóäåò ïðèñâîåí âûâîä</entry>
</row>
</tbody>
</tgroup>
</informaltable>
<note>
<title>Òåõíè÷åñêîå Çàìå÷àíèå</title>
<para>
Ïåðåìåííûå øàáëîíû îáðàáàòûâàþòñÿ òàê æå, êàê è îáû÷íûå øàáëîíû.
Îíè ïîäâëàñòíû òåì æå ïðàâèëàì è îãðàíè÷åíèÿì áåçîïàñíîñòè.
</para>
</note>
<note>
<title>Òåõíè÷åñêîå Çàìå÷àíèå</title>
<para>
Ïåðåìåííûå øàáëîíû êîìïèëèðóþòñÿ ïðè êàæäîì âûçîâå, ñêîìïèëèðîâàííûå âåðñèè
íå ñîõðàíÿþòñÿ!
Îäíàêî, åñëè <link linkend="caching">êýøèðîâàíèå</link> âêëþ÷åíî,
âûâîä áóäåò êýøèðîâàí âìåñòå ñ îñòàëüíîé ÷àñòüþ øàáëîíà.
</para>
</note>
<example>
<title>{eval}</title>
<programlisting>
<![CDATA[
setup.conf
----------
emphstart = <strong>
emphend = </strong>
title = Welcome to {$company}'s home page!
ErrorCity = You must supply a {#emphstart#}city{#emphend#}.
ErrorState = You must supply a {#emphstart#}state{#emphend#}.
]]>
</programlisting>
<para>
index.tpl:
</para>
<programlisting>
<![CDATA[
{config_load file="setup.conf"}
{eval var=$foo}
{eval var=#title#}
{eval var=#ErrorCity#}
{eval var=#ErrorState# assign="state_error"}
{$state_error}
]]>
</programlisting>
<para>
Ðåçóëüòàò âûïîëíåíèÿ äàííîãî ïðèìåðà:
</para>
<screen>
<![CDATA[
This is the contents of foo.
Welcome to Foobar Pub & Grill's home page!
You must supply a <strong>city</strong>.
You must supply a <strong>state</strong>.
]]>
</screen>
</example>
</sect1>
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