58 lines
1.7 KiB
Plaintext
58 lines
1.7 KiB
Plaintext
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#!/bin/csh
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if ( x"$1" == "x-h" ) then
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cat - <<EOF
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Simple symbolic pre-processor
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reads from stdin, writes to stdout (also writes temporary file tmp.awk)
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Interprets simple definitions and evaluates numerical expressions with
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constants definitions.
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invoking sspp -nb produces a output file where all blank
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lines have been removed
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input file syntax:
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understands any C pre-processor commands (see man cpp)
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also understands #const [var1]=[value2]; [var2]=[value2]
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the variables var1 ... can be used later in the file.
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Expression to be evaluated must be enclosed in braces {}
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except when they are in a #const declaration.
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The brace characters are entered as \\{ and \\}
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Understands c++ comment char //
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Examples:
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#const x=2*3.14
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The value is {1+cos(x)}
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#define PLUS(x,y) ((x)+(y))
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The answer is {PLUS(1,2)}
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Braces are \\{ \\}
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Implementation details:
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Any line beginning with #const or #awk
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is interpreted as an awk command (see man awk).
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Expression in braces are awk expressions.
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The file tmp.awk is the file sent to awk for interpretation.
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BUGS
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Never start a line with %
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# is not a comment character
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EOF
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exit 1
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endif
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echo -n 'BEGIN {OFMT="%.8g"; CONVFMT=OFMT; obrace="{"; cbrace="}"; ' >! tmp.awk
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sed -e 's/^#const/%/g' -e 's/#awk/%/g' -e 'sI//.*IIg' | \
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cpp -P | sed -e '\/^[^%]/ s/\"/\\"/g' | \
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sed -e '\/^[^%]/ s/^.*$/print "&"/g' \
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-e 's/\\{/\"obrace\"/g' -e 's/\\}/\"cbrace\"/g' \
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-e '\/^[^%]/ s/{\([^{}]*\)}/" (\1) "/g' \
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-e '\/^%/ s/^%/print ""; /g' \
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-e 's/^$/print ""/g' \
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>> tmp.awk
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echo "}" >> tmp.awk
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if ("x-nb" == x"$1") then
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awk -f tmp.awk | grep -v '^$'
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else
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awk -f tmp.awk
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endif
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rm -f tmp.awk
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