469 lines
9.5 KiB
HTML
469 lines
9.5 KiB
HTML
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<!DOCTYPE HTML>
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<HTML LANG="en-us"
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><HEAD
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><TITLE
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>import | Common Lisp Nova Spec</TITLE
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><META CHARSET="US-ASCII"
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><LINK REL="canonical" HREF="f_import.html"
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><LINK REL="next" HREF="f_list-all-packages.html" TYPE="text/html" TITLE="list-all-packages"
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><LINK REL="prev" HREF="f_find-all-symbols.html" TYPE="text/html" TITLE="find-all-symbols"
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><LINK REL="up" HREF="11_2_Packages_Dictionary.html" TYPE="text/html" TITLE="11.2 Packages Dictionary"
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><LINK REL="start" HREF="index.html" TYPE="text/html" TITLE="Common Lisp Nova Spec"
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><DIV
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><DIV CLASS="topnav"
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><SPAN CLASS="breadcrumb-item"
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><A HREF="index.html"
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>Common Lisp Nova Spec</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="11_Packages.html"
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>11. Packages</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="11_2_Packages_Dictionary.html"
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>11.2 Packages Dictionary</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="f_import.html"
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>import</A
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></SPAN
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></DIV
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><DIV CLASS="apropos"
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><DIV CLASS="apropos-io"
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><A HREF="f_find-all-symbols.html" CLASS="prev"
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>←</A
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><SPAN ID="apropos-label"
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>Apropos </SPAN
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><INPUT ID="apropos" AUTOFOCUS="AUTOFOCUS" PLACEHOLDER="Type here to search" ONINPUT="aproposInput(this);" ONKEYUP="aproposKeyup(event);" ONCHANGE="aproposChange(this);" ONFOCUS="aproposFocus(this);" ONFOCUSOUT="aproposFocusout(this);"
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><A HREF="f_list-all-packages.html" CLASS="next"
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>→</A
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></DIV
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><DIV ID="apropos-res"
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></DIV
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></DIV
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></DIV
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><DIV CLASS="matter"
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><DIV CLASS="com"
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><DIV CLASS="begincom"
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><HR
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><TABLE WIDTH="100%" CELLSPACING="0" CELLPADDING="0"
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="import"
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></SPAN
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><B
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>import</B
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></TD
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><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
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><I
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>Function</I
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></TD
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></TR
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></TABLE
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><HR
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></DIV
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><UL CLASS="subtoc"
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></UL
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><DL
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><DT
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><B
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>Syntax</B
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></DT
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><DD
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><P CLASS="j"
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><B
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>import</B
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> <SPAN CLASS="cmssi"
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>symbols</SPAN
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> <SPAN CLASS="cmtt"
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>&optional</SPAN
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> <SPAN CLASS="cmssi"
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>package</SPAN
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> <SPAN CLASS="arrow"
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>→</SPAN
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> <SPAN CLASS="misc"
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><B
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>t</B
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></SPAN
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></P
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></DD
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><DT
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><B
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>Arguments and Values</B
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></DT
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><DD
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><P CLASS="j"
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><VAR CLASS="param"
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>symbols</VAR
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> — a <A HREF="26_1_Glossary.html#designator"
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><EM CLASS="term"
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>designator</EM
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></A
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> for a <A HREF="26_1_Glossary.html#list"
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><EM CLASS="term"
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>list</EM
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></A
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> of <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbols</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>package</VAR
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> — a <A HREF="26_1_Glossary.html#package_designator"
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><EM CLASS="term"
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>package designator</EM
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></A
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>. The default is the <A HREF="26_1_Glossary.html#current_package"
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><EM CLASS="term"
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>current package</EM
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></A
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>.</P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="f_import.html" CLASS="funref"
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><B
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>import</B
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></A
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> adds <VAR CLASS="param"
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>symbol</VAR
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> or <VAR CLASS="param"
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>symbols</VAR
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> to the internals of <VAR CLASS="param"
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>package</VAR
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>, checking for name conflicts with existing <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbols</EM
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></A
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> either <A HREF="26_1_Glossary.html#present"
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><EM CLASS="term"
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>present</EM
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></A
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> in <VAR CLASS="param"
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>package</VAR
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> or <A HREF="26_1_Glossary.html#accessible"
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><EM CLASS="term"
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>accessible</EM
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></A
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> to it. Once the <VAR CLASS="param"
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>symbols</VAR
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> have been <A HREF="26_1_Glossary.html#import"
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><EM CLASS="term"
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>imported</EM
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></A
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>, they may be referenced in the <A HREF="26_1_Glossary.html#import"
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><EM CLASS="term"
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>importing</EM
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></A
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> <VAR CLASS="param"
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>package</VAR
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> without the use of a <A HREF="26_1_Glossary.html#package_prefix"
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><EM CLASS="term"
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>package prefix</EM
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></A
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> when using the <A HREF="26_1_Glossary.html#Lisp_reader"
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><EM CLASS="term"
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>Lisp reader</EM
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></A
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>. </P
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><P CLASS="j"
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>A name conflict in <A HREF="f_import.html" CLASS="funref"
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><B
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>import</B
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></A
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> between the <VAR CLASS="param"
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>symbol</VAR
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> being imported and a symbol inherited from some other <A HREF="26_1_Glossary.html#package"
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><EM CLASS="term"
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>package</EM
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></A
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> can be resolved in favor of the <VAR CLASS="param"
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>symbol</VAR
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> being <A HREF="26_1_Glossary.html#import"
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><EM CLASS="term"
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>imported</EM
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></A
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> by making it a shadowing symbol, or in favor of the <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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> already <A HREF="26_1_Glossary.html#accessible"
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><EM CLASS="term"
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>accessible</EM
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></A
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> by not doing the <A HREF="f_import.html" CLASS="funref"
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><B
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>import</B
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></A
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>. A name conflict in <A HREF="f_import.html" CLASS="funref"
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><B
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>import</B
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></A
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> with a <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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> already <A HREF="26_1_Glossary.html#present"
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><EM CLASS="term"
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>present</EM
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></A
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> in the <VAR CLASS="param"
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>package</VAR
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> may be resolved by uninterning that <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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>, or by not doing the <A HREF="f_import.html" CLASS="funref"
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><B
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>import</B
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></A
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>. </P
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><P CLASS="j"
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>The imported <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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> is not automatically exported from the <A HREF="26_1_Glossary.html#current_package"
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><EM CLASS="term"
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>current package</EM
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></A
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>, but if it is already <A HREF="26_1_Glossary.html#present"
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><EM CLASS="term"
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>present</EM
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></A
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> and external, then the fact that it is external is not changed. If any <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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> to be <A HREF="26_1_Glossary.html#import"
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><EM CLASS="term"
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>imported</EM
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></A
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> has no home package (<I CLASS="i"
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><I
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>i.e.</I
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></I
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>, <SPAN CLASS="cmtt"
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>(symbol-package</SPAN
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> <VAR CLASS="param"
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>symbol</VAR
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><SPAN CLASS="cmtt"
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>)</SPAN
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> <SPAN CLASS="arrow"
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>→</SPAN
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> <SPAN CLASS="cmtt"
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>nil</SPAN
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>), <A HREF="f_import.html" CLASS="funref"
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><B
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>import</B
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></A
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> sets the <A HREF="26_1_Glossary.html#home_package"
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><EM CLASS="term"
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>home package</EM
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></A
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> of the <VAR CLASS="param"
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>symbol</VAR
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> to <VAR CLASS="param"
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>package</VAR
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>. </P
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><P CLASS="j"
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>If the <VAR CLASS="param"
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>symbol</VAR
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> is already <A HREF="26_1_Glossary.html#present"
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><EM CLASS="term"
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>present</EM
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></A
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> in the importing <VAR CLASS="param"
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>package</VAR
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>, <A HREF="f_import.html" CLASS="funref"
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><B
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>import</B
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></A
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> has no effect.</P
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></DD
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><DT
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><B
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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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>(import 'common-lisp::car (make-package 'temp :use nil)) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> T
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(find-symbol "CAR" 'temp) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> CAR, :INTERNAL
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(find-symbol "CDR" 'temp) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> NIL, NIL</PRE
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><P CLASS="j"
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>The form <CODE CLASS="f"
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>(import 'editor:buffer)</CODE
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> takes the external symbol named <CODE CLASS="f"
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>buffer</CODE
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> in the <SPAN CLASS="packref"
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><SPAN CLASS="cmtt"
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>EDITOR</SPAN
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></SPAN
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> <A HREF="26_1_Glossary.html#package"
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><EM CLASS="term"
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>package</EM
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></A
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> (this symbol was located when the form was read by the <A HREF="26_1_Glossary.html#Lisp_reader"
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><EM CLASS="term"
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>Lisp reader</EM
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></A
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>) and adds it to the <A HREF="26_1_Glossary.html#current_package"
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><EM CLASS="term"
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>current package</EM
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></A
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> as an <A HREF="26_1_Glossary.html#internal_symbol"
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><EM CLASS="term"
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>internal symbol</EM
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></A
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>. The symbol <CODE CLASS="f"
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>buffer</CODE
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> is then <A HREF="26_1_Glossary.html#present"
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><EM CLASS="term"
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>present</EM
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></A
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> in the <A HREF="26_1_Glossary.html#current_package"
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><EM CLASS="term"
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>current package</EM
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></A
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>.</P
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></DD
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><DT
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><B
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>Side Effects</B
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></DT
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><DD
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><P CLASS="j"
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>The package system is modified.</P
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></DD
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><DT
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><B
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>Affected By</B
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></DT
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><DD
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><P CLASS="j"
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>Current state of the package system.</P
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></DD
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><DT
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><B
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>Exceptional Situations</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="f_import.html" CLASS="funref"
|
||
|
|
><B
|
||
|
|
>import</B
|
||
|
|
></A
|
||
|
|
> signals a <A HREF="26_1_Glossary.html#correctable"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>correctable</EM
|
||
|
|
></A
|
||
|
|
> error of <A HREF="26_1_Glossary.html#type"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>type</EM
|
||
|
|
></A
|
||
|
|
> <A HREF="t_package-error.html" CLASS="typeref"
|
||
|
|
><B
|
||
|
|
>package-error</B
|
||
|
|
></A
|
||
|
|
> if any of the <VAR CLASS="param"
|
||
|
|
>symbols</VAR
|
||
|
|
> to be <A HREF="26_1_Glossary.html#import"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>imported</EM
|
||
|
|
></A
|
||
|
|
> has the <A HREF="26_1_Glossary.html#same"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>same</EM
|
||
|
|
></A
|
||
|
|
> <A HREF="26_1_Glossary.html#name"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>name</EM
|
||
|
|
></A
|
||
|
|
> (under <A HREF="f_string_eq.html" CLASS="funref"
|
||
|
|
><B
|
||
|
|
>string=</B
|
||
|
|
></A
|
||
|
|
>) as some distinct <A HREF="26_1_Glossary.html#symbol"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>symbol</EM
|
||
|
|
></A
|
||
|
|
> (under <A HREF="f_eql.html" CLASS="funref"
|
||
|
|
><B
|
||
|
|
>eql</B
|
||
|
|
></A
|
||
|
|
>) already <A HREF="26_1_Glossary.html#accessible"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>accessible</EM
|
||
|
|
></A
|
||
|
|
> in the <VAR CLASS="param"
|
||
|
|
>package</VAR
|
||
|
|
>, even if the conflict is with a <A HREF="26_1_Glossary.html#shadowing_symbol"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>shadowing symbol</EM
|
||
|
|
></A
|
||
|
|
> of the <VAR CLASS="param"
|
||
|
|
>package</VAR
|
||
|
|
>.</P
|
||
|
|
></DD
|
||
|
|
><DT
|
||
|
|
><B
|
||
|
|
>See Also</B
|
||
|
|
></DT
|
||
|
|
><DD
|
||
|
|
><P CLASS="j"
|
||
|
|
><A HREF="f_shadow.html" CLASS="funref"
|
||
|
|
><B
|
||
|
|
>shadow</B
|
||
|
|
></A
|
||
|
|
>, <A HREF="f_export.html" CLASS="funref"
|
||
|
|
><B
|
||
|
|
>export</B
|
||
|
|
></A
|
||
|
|
></P
|
||
|
|
></DD
|
||
|
|
></DL
|
||
|
|
></DIV
|
||
|
|
></DIV
|
||
|
|
><DIV CLASS="footer"
|
||
|
|
><DIV CLASS="btmnav"
|
||
|
|
><A HREF="f_find-all-symbols.html" CLASS="prev"
|
||
|
|
>←</A
|
||
|
|
><A HREF="f_list-all-packages.html" CLASS="next"
|
||
|
|
>→</A
|
||
|
|
></DIV
|
||
|
|
><DIV CLASS="trail"
|
||
|
|
>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
|
||
|
|
></DIV
|
||
|
|
></DIV
|
||
|
|
><SCRIPT
|
||
|
|
>domReady();</SCRIPT
|
||
|
|
></BODY
|
||
|
|
></HTML
|
||
|
|
>
|