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164 lines
2.2 KiB
Sed
164 lines
2.2 KiB
Sed
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#
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# @(#)math.sed 8.1 (Berkeley) 6/6/93
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#
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# Addition and multiplication in sed.
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# ++ for a limited time only do (expr) too!!!
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#
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# Kevin S Braunsdorf, PUCC UNIX Group, ksb@cc.purdue.edu.
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#
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# Ex:
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# echo "4+7*3" | sed -f %f
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# make sure the expression is well formed
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s/[ ]//g
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/[+*\/-]$/{
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a\
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poorly formed expression, operator on the end
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q
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}
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/^[+*\/]/{
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a\
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poorly formed expression, leading operator
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q
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}
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# fill hold space with done token
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x
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s/^.*/done/
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x
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# main loop, process operators (*, + and () )
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: loop
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/^\+/{
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s///
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b loop
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}
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/^\(.*\)(\([^)]*\))\(.*\)$/{
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H
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s//\2/
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x
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s/^\(.*\)\n\(.*\)(\([^()]*\))\(.*\)$/()\2@\4@\1/
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x
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b loop
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}
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/^[0-9]*\*/b mul
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/^\([0-9]*\)\+\([0-9+*]*\*[0-9]*\)$/{
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s//\2+\1/
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b loop
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}
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/^[0-9]*\+/{
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s/$/=/
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b add
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}
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x
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/^done$/{
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x
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p
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d
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}
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/^()/{
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s///
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x
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G
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s/\(.*\)\n\([^@]*\)@\([^@]*\)@\(.*\)/\2\1\3/
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x
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s/[^@]*@[^@]*@\(.*\)/\1/
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x
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b loop
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}
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i\
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help, stack problem
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p
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x
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p
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q
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# turn mul into add until 1*x -> x
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: mul
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/^0*1\*/{
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s///
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b loop
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}
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/^\([0-9]*\)0\*/{
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s/^\([0-9]*\)0\*\([0-9]*\)/\1*\20/
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b mul
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}
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s/^\([0-9]*\)1\*/\10*/
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s/^\([0-9]*\)2\*/\11*/
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s/^\([0-9]*\)3\*/\12*/
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s/^\([0-9]*\)4\*/\13*/
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s/^\([0-9]*\)5\*/\14*/
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s/^\([0-9]*\)6\*/\15*/
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s/^\([0-9]*\)7\*/\16*/
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s/^\([0-9]*\)8\*/\17*/
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s/^\([0-9]*\)9\*/\18*/
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s/\*\([0-9*]*\)/*\1+\1/
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b mul
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# get rid of a plus term until 0+x -> x
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: add
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/^\+\([0-9+*]*\)=/{
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s//\1/
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b loop
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}
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/^\([0-9*]*\)\+=/{
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s//\1/
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b loop
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}
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/^\([0-9]*\)\+\([0-9*+]*\)\+=/{
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s//\2+\1/
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b loop
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}
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/^\([0-9]*\)0\+\([0-9]*\)\([0-9]\)=/{
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s//\1+\2=\3/
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b add
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}
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/^\([0-9]*\)\([0-9]\)\+\([0-9]*\)0=/{
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s//\1+\3=\2/
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b add
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}
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/^\([0-9]*\)0\+\([0-9*+]*\)\+\([0-9]*\)\([0-9]\)=/{
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s//\1+\2+\3=\4/
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b add
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}
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/^\([0-9]*\)\([0-9]\)\+\([0-9*+]*\)\+\([0-9]*\)0=/{
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s//\1+\3+\4=\2/
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b add
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}
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s/^\([0-9]*\)1\+/\10+/
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s/^\([0-9]*\)2\+/\11+/
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s/^\([0-9]*\)3\+/\12+/
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s/^\([0-9]*\)4\+/\13+/
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s/^\([0-9]*\)5\+/\14+/
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s/^\([0-9]*\)6\+/\15+/
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s/^\([0-9]*\)7\+/\16+/
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s/^\([0-9]*\)8\+/\17+/
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s/^\([0-9]*\)9\+/\18+/
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s/9=\([0-9]*\)$/_=\1/
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s/8=\([0-9]*\)$/9=\1/
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s/7=\([0-9]*\)$/8=\1/
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s/6=\([0-9]*\)$/7=\1/
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s/5=\([0-9]*\)$/6=\1/
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s/4=\([0-9]*\)$/5=\1/
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s/3=\([0-9]*\)$/4=\1/
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s/2=\([0-9]*\)$/3=\1/
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s/1=\([0-9]*\)$/2=\1/
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/_/{
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s//_0/
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: inc
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s/9_/_0/
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s/8_/9/
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s/7_/8/
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s/6_/7/
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s/5_/6/
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s/4_/5/
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s/3_/4/
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s/2_/3/
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s/1_/2/
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s/0_/1/
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s/\+_/+1/
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/_/b inc
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}
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b add
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