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docbook-style-dsssl-doc-1.79-16.mga7.noarch.rpm

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NAME="PARSE-MEASUREMENT"
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>parse-measurement</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN1510"
></A
><H2
>Name</H2
>parse-measurement&nbsp;--&nbsp;Parse a string containing a measurement and return the magnitude and units</DIV
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CLASS="REFSYNOPSISDIV"
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NAME="AEN1513"
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><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>(parse-measurement measure)</PRE
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NAME="AEN1516"
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><H2
>Description</H2
><P
>Parse a string containing a measurement, e.g., <TT
CLASS="LITERAL"
>"3pi"</TT
> or <TT
CLASS="LITERAL"
>"2.5in"</TT
>,
and return the magnitude and units: <TT
CLASS="LITERAL"
>(3 "pi")</TT
> or <TT
CLASS="LITERAL"
>(2.5 "in")</TT
>.</P
><P
>Either element of the list may be <TT
CLASS="LITERAL"
>#f</TT
> if the string cannot reasonably
be parsed as a measurement.  Leading and trailing spaces are ignored.</P
></DIV
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><A
NAME="AEN1525"
></A
><H2
>Author</H2
><P
>Norman Walsh, &lt;ndw@nwalsh.com&gt;</P
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><H2
>Source Code</H2
><PRE
CLASS="PROGRAMLISTING"
>(define (parse-measurement measure)
  ;; Parse a string containing a measurement and return the magnitude and units
  (let* ((magstart  (find-first-char measure " " "0123456789."))
	 (unitstart (find-first-char measure " 0123456789." ""))
	 (unitend   (find-first-char measure "" " " unitstart))
	 (magnitude (if (&#60; magstart 0)
			#f
			(if (&#60; unitstart 0)
			    (substring measure 
				       magstart 
				       (string-length measure))
			    (substring measure magstart unitstart))))
	 (unit      (if (&#60; unitstart 0)
			#f
			(if (&#60; unitend 0)
			    (substring measure 
				       unitstart 
				       (string-length measure))
			    (substring measure unitstart unitend)))))
  (list magnitude unit)))</PRE
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