/usr/share/doc/nsis/Examples/Math/math.nsi is in nsis-doc 2.46-7.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | ; This is just an example of Math plugin
;
; (c) brainsucker, 2002
; (r) BSForce
Name "Math Plugin Example"
OutFile "math.exe"
ShowInstDetails show
XPStyle on
Section "ThisNameIsIgnoredSoWhyBother?"
Math::Script 'SaR(s,fa,ra, i,f,r,e,p) (i=0;#{i<l(fa),e=l(f=fa[i]);r=ra[i];p=0;#{p<l(s),#[s[p,p+e-1]==f,s=(s[,p-1])+r+(s[p+e,]);p+=l(r), p++]}; i++}; s);'
Math::Script "TQ(s) (s = s(NS); #[s[0]=='$\"',s=s[1,]]; #[s[-1]=='$\"',s=s[,-2]]; NS = s)"
Math::Script "P(s,e, p,i) (p=-1;i=0; #{(i<l(s))&&(p<0), #[s[i,i+l(e)-1]==e, p=i]; i++}; p)"
Math::Script "DL(s) (s=s(NS); p=P(s,'\r\n'); #[p>=0, (NS=s[p+4,]; NS=#[p>0,s[,p-1],'']), (NS='';NS=s)])"
Math::Script "a = 'Hello \r\n World \r\n!!!'; a = SaR(a,{'\r','\n'},{'$\r','$\n'}); R0 = a"
Math::Script "NS = '$\"In quotes$\"'; TQ(); R1=NS; R3=P(s(R1),'qu')"
Math::Script "NS = 'No quotes'; TQ(); R2=NS"
Math::Script "NS='123\r\n456\r\n789'; DL(); R4=NS; DL(); R5=NS; DL(); R6=NS; R7=NS"
DetailPrint "'$R0'"
DetailPrint "'$R1'"
DetailPrint "'$R2'"
DetailPrint "'$R3'"
DetailPrint "'$R4'"
DetailPrint "'$R5'"
DetailPrint "'$R6'"
DetailPrint "'$R7'"
SectionEnd
; eof
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