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><H1
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NAME="PARSE-MEASUREMENT"
></A
>parse-measurement</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN1510"
></A
><H2
>Name</H2
>parse-measurement -- Parse a string containing a measurement and return the magnitude and units</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN1513"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>(parse-measurement measure)</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1516"
></A
><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
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1525"
></A
><H2
>Author</H2
><P
>Norman Walsh, <ndw@nwalsh.com></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1528"
></A
><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 (< magstart 0)
#f
(if (< unitstart 0)
(substring measure
magstart
(string-length measure))
(substring measure magstart unitstart))))
(unit (if (< unitstart 0)
#f
(if (< unitend 0)
(substring measure
unitstart
(string-length measure))
(substring measure unitstart unitend)))))
(list magnitude unit)))</PRE
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