364 lines
7.8 KiB
HTML
364 lines
7.8 KiB
HTML
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>set-syntax-from-char</A
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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="set-syntax-from-char"
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></SPAN
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><B
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>set-syntax-from-char</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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>set-syntax-from-char</B
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> <SPAN CLASS="cmssi"
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>to-char</SPAN
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> <SPAN CLASS="cmssi"
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>from-char</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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>to-readtable</SPAN
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> <SPAN CLASS="cmssi"
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>from-readtable</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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>to-char</VAR
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> — a <A HREF="26_1_Glossary.html#character"
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><EM CLASS="term"
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>character</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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>from-char</VAR
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> — a <A HREF="26_1_Glossary.html#character"
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><EM CLASS="term"
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>character</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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>to-readtable</VAR
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> — a <A HREF="26_1_Glossary.html#readtable"
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><EM CLASS="term"
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>readtable</EM
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></A
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>. The default is the <A HREF="26_1_Glossary.html#current_readtable"
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><EM CLASS="term"
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>current readtable</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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>from-readtable</VAR
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> — a <A HREF="26_1_Glossary.html#readtable_designator"
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><EM CLASS="term"
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>readtable designator</EM
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></A
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>. The default is the <A HREF="26_1_Glossary.html#standard_readtable"
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><EM CLASS="term"
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>standard readtable</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_set-syntax-from-char.html" CLASS="funref"
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><B
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>set-syntax-from-char</B
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></A
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> makes the syntax of <VAR CLASS="param"
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>to-char</VAR
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> in <VAR CLASS="param"
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>to-readtable</VAR
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> be the same as the syntax of <VAR CLASS="param"
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>from-char</VAR
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> in <VAR CLASS="param"
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>from-readtable</VAR
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>. </P
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><P CLASS="j"
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><A HREF="f_set-syntax-from-char.html" CLASS="funref"
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><B
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>set-syntax-from-char</B
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></A
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> copies the <A HREF="26_1_Glossary.html#syntax_type"
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><EM CLASS="term"
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>syntax types</EM
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></A
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> of <VAR CLASS="param"
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>from-char</VAR
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>. If <VAR CLASS="param"
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>from-char</VAR
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> is a <A HREF="26_1_Glossary.html#macro_character"
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><EM CLASS="term"
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>macro character</EM
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></A
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>, its <A HREF="26_1_Glossary.html#reader_macro_function"
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><EM CLASS="term"
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>reader macro function</EM
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></A
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> is copied also. If the character is a <A HREF="26_1_Glossary.html#dispatching_macro_character"
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><EM CLASS="term"
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>dispatching macro character</EM
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></A
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>, its entire dispatch table of <A HREF="26_1_Glossary.html#reader_macro_function"
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><EM CLASS="term"
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>reader macro functions</EM
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></A
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> is copied. The <A HREF="26_1_Glossary.html#constituent_trait"
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><EM CLASS="term"
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>constituent traits</EM
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></A
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> of <VAR CLASS="param"
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>from-char</VAR
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> are not copied. </P
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><P CLASS="j"
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>A macro definition from a character such as <CODE CLASS="f"
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>"</CODE
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> can be copied to another character; the standard definition for <CODE CLASS="f"
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>"</CODE
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> looks for another character that is the same as the character that invoked it. The definition of <CODE CLASS="f"
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>(</CODE
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> can not be meaningfully copied to <CODE CLASS="f"
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>{</CODE
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>, on the other hand. The result is that <A HREF="26_1_Glossary.html#list"
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><EM CLASS="term"
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>lists</EM
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></A
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> are of the form <CODE CLASS="f"
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>{a b c)</CODE
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>, not <CODE CLASS="f"
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>{a b c}</CODE
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>, because the definition always looks for a closing parenthesis, not a closing brace.</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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>(set-syntax-from-char #\7 #\;) <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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123579 <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 1235</PRE
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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 <VAR CLASS="param"
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>to-readtable</VAR
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> 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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>The existing values in the <VAR CLASS="param"
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>from-readtable</VAR
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>.</P
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></DD
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><DT
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><B
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>See Also</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_set-macro-character.html" CLASS="funref"
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><B
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>set-macro-character</B
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></A
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>, <A HREF="f_make-dispatch-macro-character.html" CLASS="funref"
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><B
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>make-dispatch-macro-character</B
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></A
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>, <A HREF="2_1_Character_Syntax.html#sec_2_1_4" 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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>2.1.4</SPAN
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> <SPAN CLASS="cmr"
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>(Character</SPAN
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> <SPAN CLASS="cmr"
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>Syntax</SPAN
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> <SPAN CLASS="cmr"
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>Types)</SPAN
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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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>Notes</B
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></DT
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><DD
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><P CLASS="j"
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>The <A HREF="26_1_Glossary.html#constituent_trait"
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><EM CLASS="term"
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>constituent traits</EM
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></A
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> of a <A HREF="26_1_Glossary.html#character"
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><EM CLASS="term"
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>character</EM
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></A
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> are “hard wired” into the parser for extended <A HREF="26_1_Glossary.html#token"
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><EM CLASS="term"
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>tokens</EM
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></A
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>. For example, if the definition of <CODE CLASS="f"
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>S</CODE
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> is copied to <CODE CLASS="f"
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>*</CODE
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>, then <CODE CLASS="f"
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>*</CODE
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> will become a <A HREF="26_1_Glossary.html#constituent"
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><EM CLASS="term"
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>constituent</EM
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></A
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> that is <A HREF="26_1_Glossary.html#alphabetic"
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><EM CLASS="term"
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>alphabetic</EM
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></A
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><SPAN CLASS="meaning"
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><SUB CLASS="sub"
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><SPAN CLASS="cmr"
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>2</SPAN
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></SUB
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></SPAN
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> but that cannot be used as a <A HREF="26_1_Glossary.html#short_float"
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><EM CLASS="term"
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>short float</EM
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></A
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> <A HREF="26_1_Glossary.html#exponent_marker"
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><EM CLASS="term"
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>exponent marker</EM
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></A
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>. For further information, see <A HREF="2_1_Character_Syntax.html#sec_2_1_4_2" 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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>2.1.4.2</SPAN
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> <SPAN CLASS="cmr"
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>(Constituent</SPAN
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> <SPAN CLASS="cmr"
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>Traits)</SPAN
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></A
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>.</P
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></DD
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></DL
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></DIV
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></DIV
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||
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><DIV CLASS="footer"
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><DIV CLASS="btmnav"
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><A HREF="f_set-macro-character.html" CLASS="prev"
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>←</A
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><A HREF="f_with-standard-io-syntax.html" CLASS="next"
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>→</A
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></DIV
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><DIV CLASS="trail"
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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