480 lines
10 KiB
HTML
480 lines
10 KiB
HTML
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<HTML LANG="en-us"
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>pprint-fill, pprint-linear, pprint-tabular | Common Lisp Nova Spec</TITLE
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><A HREF="index.html"
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>Common Lisp Nova Spec</A
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>→ <A HREF="22_Printer.html"
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>22. Printer</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="22_4_Printer_Dictionary.html"
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>22.4 Printer Dictionary</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="f_pprint-fill.html"
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>pprint-fill, pprint-linear, pprint-tabular</A
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><A HREF="f_pprint-exit-if-list-exhausted.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_pprint-indent.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="pprint-fill, pprint-linear, pprint-tabular"
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></SPAN
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><B
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>pprint-fill, pprint-linear, pprint-tabular</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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>pprint-fill</B
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> <SPAN CLASS="cmssi"
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>stream</SPAN
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> <SPAN CLASS="cmssi"
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>object</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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>colon-p</SPAN
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> <SPAN CLASS="cmssi"
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>at-sign-p</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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>nil</B
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></SPAN
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></P
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><P CLASS="j"
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><B
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>pprint-linear</B
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> <SPAN CLASS="cmssi"
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>stream</SPAN
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> <SPAN CLASS="cmssi"
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>object</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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>colon-p</SPAN
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> <SPAN CLASS="cmssi"
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>at-sign-p</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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>nil</B
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></SPAN
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></P
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><P CLASS="j"
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><B
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>pprint-tabular</B
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> <SPAN CLASS="cmssi"
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>stream</SPAN
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> <SPAN CLASS="cmssi"
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>object</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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>colon-p</SPAN
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> <SPAN CLASS="cmssi"
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>at-sign-p</SPAN
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> <SPAN CLASS="cmssi"
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>tabsize</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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>nil</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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>stream</VAR
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> — an <A HREF="26_1_Glossary.html#output"
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><EM CLASS="term"
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>output</EM
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></A
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> <A HREF="26_1_Glossary.html#stream_designator"
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><EM CLASS="term"
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>stream designator</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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>object</VAR
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> — an <A HREF="26_1_Glossary.html#object"
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><EM CLASS="term"
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>object</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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>colon-p</VAR
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> — a <A HREF="26_1_Glossary.html#generalized_boolean"
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><EM CLASS="term"
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>generalized boolean</EM
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></A
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>. The default is <A HREF="26_1_Glossary.html#true"
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><EM CLASS="term"
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>true</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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>at-sign-p</VAR
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> — a <A HREF="26_1_Glossary.html#generalized_boolean"
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><EM CLASS="term"
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>generalized boolean</EM
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></A
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>. The default is <A HREF="26_1_Glossary.html#implementation-dependent"
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><EM CLASS="term"
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>implementation-dependent</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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>tabsize</VAR
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> — a non-negative <A HREF="26_1_Glossary.html#integer"
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><EM CLASS="term"
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>integer</EM
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></A
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>. The default is <CODE CLASS="f"
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>16</CODE
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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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>The functions <A HREF="f_pprint-fill.html" CLASS="funref"
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><B
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>pprint-fill</B
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></A
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>, <A HREF="f_pprint-fill.html" CLASS="funref"
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><B
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>pprint-linear</B
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></A
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>, and <A HREF="f_pprint-fill.html" CLASS="funref"
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><B
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>pprint-tabular</B
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></A
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> specify particular ways of <A HREF="26_1_Glossary.html#pretty_print"
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><EM CLASS="term"
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>pretty printing</EM
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></A
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> 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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> to <VAR CLASS="param"
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>stream</VAR
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>. Each function prints parentheses around the output if and only if <VAR CLASS="param"
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>colon-p</VAR
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> is <A HREF="26_1_Glossary.html#true"
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><EM CLASS="term"
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>true</EM
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></A
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>. Each function ignores its <VAR CLASS="param"
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>at-sign-p</VAR
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> argument. (Both arguments are included even though only one is needed so that these functions can be used via <SPAN CLASS="cmtt"
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>~/.../</SPAN
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> and as <A HREF="f_set-pprint-dispatch.html" CLASS="funref"
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><B
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>set-pprint-dispatch</B
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></A
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> functions, as well as directly.) Each function handles abbreviation and the detection of circularity and sharing correctly, and uses <A HREF="f_write.html" CLASS="funref"
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><B
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>write</B
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></A
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> to print <VAR CLASS="param"
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>object</VAR
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> when it is a <A HREF="26_1_Glossary.html#non-list"
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><EM CLASS="term"
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>non-list</EM
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></A
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>. </P
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><P CLASS="j"
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>If <VAR CLASS="param"
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>object</VAR
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> is 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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> and if the <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>value</EM
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></A
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> of <A HREF="v_print-pretty.html" CLASS="misc"
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><B
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>*print-pretty*</B
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></A
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> is <A HREF="26_1_Glossary.html#false"
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><EM CLASS="term"
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>false</EM
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></A
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>, each of these functions prints <VAR CLASS="param"
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>object</VAR
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> using a minimum of <A HREF="26_1_Glossary.html#whitespace"
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><EM CLASS="term"
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>whitespace</EM
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></A
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>, as described in <A HREF="22_1_The_Lisp_Printer.html#sec_22_1_3_5" CLASS="secref"
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><SPAN CLASS="cmr"
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>Section</SPAN
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> <SPAN CLASS="cmr"
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>22.1.3.5</SPAN
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> <SPAN CLASS="cmr"
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>(Printing</SPAN
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> <SPAN CLASS="cmr"
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>Lists</SPAN
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> <SPAN CLASS="cmr"
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>and</SPAN
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> <SPAN CLASS="cmr"
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>Conses)</SPAN
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></A
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>. Otherwise (if <VAR CLASS="param"
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>object</VAR
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> is 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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> and if the <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>value</EM
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></A
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> of <A HREF="v_print-pretty.html" CLASS="misc"
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><B
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>*print-pretty*</B
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></A
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> is <A HREF="26_1_Glossary.html#true"
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><EM CLASS="term"
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>true</EM
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></A
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>):</P
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><UL
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><LI
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> <A HREF="f_pprint-fill.html" CLASS="funref"
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><B
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>pprint-linear</B
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></A
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> prints 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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> either all on one line, or with each <A HREF="26_1_Glossary.html#element"
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><EM CLASS="term"
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>element</EM
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></A
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> on a separate line.</P
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></LI
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><LI
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> <A HREF="f_pprint-fill.html" CLASS="funref"
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><B
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>pprint-fill</B
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></A
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> prints 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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> with as many <A HREF="26_1_Glossary.html#element"
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><EM CLASS="term"
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>elements</EM
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></A
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> as possible on each line.</P
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></LI
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><LI
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|
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> <A HREF="f_pprint-fill.html" CLASS="funref"
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||
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><B
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>pprint-tabular</B
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||
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></A
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||
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> is the same as <A HREF="f_pprint-fill.html" CLASS="funref"
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||
|
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><B
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||
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|
>pprint-fill</B
|
||
|
|
></A
|
||
|
|
> except that it prints the <A HREF="26_1_Glossary.html#element"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>elements</EM
|
||
|
|
></A
|
||
|
|
> so that they line up in columns. The <VAR CLASS="param"
|
||
|
|
>tabsize</VAR
|
||
|
|
> specifies the column spacing in <A HREF="26_1_Glossary.html#em"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>ems</EM
|
||
|
|
></A
|
||
|
|
>, which is the total spacing from the leading edge of one column to the leading edge of the next.</P
|
||
|
|
></LI
|
||
|
|
></UL
|
||
|
|
></DD
|
||
|
|
><DT
|
||
|
|
><B
|
||
|
|
>Examples</B
|
||
|
|
></DT
|
||
|
|
><DD
|
||
|
|
><P CLASS="j"
|
||
|
|
>Evaluating the following with a line length of <CODE CLASS="f"
|
||
|
|
>25</CODE
|
||
|
|
> produces the output shown.</P
|
||
|
|
><PRE CLASS="screen"
|
||
|
|
>(progn (princ "Roads ")
|
||
|
|
(pprint-tabular *standard-output* '(elm main maple center) nil nil 8))
|
||
|
|
Roads ELM MAIN
|
||
|
|
MAPLE CENTER</PRE
|
||
|
|
></DD
|
||
|
|
><DT
|
||
|
|
><B
|
||
|
|
>Side Effects</B
|
||
|
|
></DT
|
||
|
|
><DD
|
||
|
|
><P CLASS="j"
|
||
|
|
>Performs output to the indicated <A HREF="26_1_Glossary.html#stream"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>stream</EM
|
||
|
|
></A
|
||
|
|
>.</P
|
||
|
|
></DD
|
||
|
|
><DT
|
||
|
|
><B
|
||
|
|
>Affected By</B
|
||
|
|
></DT
|
||
|
|
><DD
|
||
|
|
><P CLASS="j"
|
||
|
|
>The cursor position on the indicated <A HREF="26_1_Glossary.html#stream"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>stream</EM
|
||
|
|
></A
|
||
|
|
>, if it can be determined.</P
|
||
|
|
></DD
|
||
|
|
><DT
|
||
|
|
><B
|
||
|
|
>Notes</B
|
||
|
|
></DT
|
||
|
|
><DD
|
||
|
|
><P CLASS="j"
|
||
|
|
>The <A HREF="26_1_Glossary.html#function"
|
||
|
|
><EM CLASS="term"
|
||
|
|
>function</EM
|
||
|
|
></A
|
||
|
|
> <A HREF="f_pprint-fill.html" CLASS="funref"
|
||
|
|
><B
|
||
|
|
>pprint-tabular</B
|
||
|
|
></A
|
||
|
|
> could be defined as follows:</P
|
||
|
|
><PRE CLASS="screen"
|
||
|
|
>(defun pprint-tabular (s list &optional (colon-p t) at-sign-p (tabsize nil))
|
||
|
|
(declare (ignore at-sign-p))
|
||
|
|
(when (null tabsize) (setq tabsize 16))
|
||
|
|
(pprint-logical-block (s list :prefix (if colon-p "(" "")
|
||
|
|
:suffix (if colon-p ")" ""))
|
||
|
|
(pprint-exit-if-list-exhausted)
|
||
|
|
(loop (write (pprint-pop) :stream s)
|
||
|
|
(pprint-exit-if-list-exhausted)
|
||
|
|
(write-char #\Space s)
|
||
|
|
(pprint-tab :section-relative 0 tabsize s)
|
||
|
|
(pprint-newline :fill s))))</PRE
|
||
|
|
><P CLASS="j"
|
||
|
|
>Note that it would have been inconvenient to specify this function using <A HREF="f_format.html" CLASS="funref"
|
||
|
|
><B
|
||
|
|
>format</B
|
||
|
|
></A
|
||
|
|
>, because of the need to pass its <VAR CLASS="param"
|
||
|
|
>tabsize</VAR
|
||
|
|
> argument through to a <SPAN CLASS="cmtt"
|
||
|
|
>~:T</SPAN
|
||
|
|
> format directive nested within an iteration over a list.</P
|
||
|
|
></DD
|
||
|
|
></DL
|
||
|
|
></DIV
|
||
|
|
></DIV
|
||
|
|
><DIV CLASS="footer"
|
||
|
|
><DIV CLASS="btmnav"
|
||
|
|
><A HREF="f_pprint-exit-if-list-exhausted.html" CLASS="prev"
|
||
|
|
>←</A
|
||
|
|
><A HREF="f_pprint-indent.html" CLASS="next"
|
||
|
|
>→</A
|
||
|
|
></DIV
|
||
|
|
><DIV CLASS="trail"
|
||
|
|
>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
|
||
|
|
></DIV
|
||
|
|
></DIV
|
||
|
|
><SCRIPT
|
||
|
|
>domReady();</SCRIPT
|
||
|
|
></BODY
|
||
|
|
></HTML
|
||
|
|
>
|