Category:Initlib: Difference between revisions
Improved display of source code, enabled syntax highlighting, and fixed sloppy formatting and typos.
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(Improved display of source code, enabled syntax highlighting, and fixed sloppy formatting and typos.) |
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Here is a library of functions tested in
<syntaxhighlight lang="shell" inline>
ghostscript -q -dNODISPLAY -c '(initlib.ps) run'
</syntaxhighlight>
== <code>initlib.ps</code> ==
<
%!PS
% conventions: parameter names with let begins with .
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/empty? {dup length 0 eq?}.
/zero? {dup 0 eq?}.
% stack invariant, execute any predicate and
% leave stack untouched except for answer.
/? {
4 dict begin
end}.
% stacky functions
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/uncons {getname getbody}.
/concat {exch [ rup aload pop counttomark -1 roll aload pop ] }.
% make a unit list.
/unit {1 array astore cvx}.
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/find {
4 dict begin
end}.
/transpose {
}.
/zip {[rup] transpose}.
% [[1 2 3 4 ] [5 6 7 8] [9 10 11 12]] transpose
/all? {
{
}.
% 1 {{10 gt} {5 gt} {0 gt}} any?
/any? {
{
}.
/pipe {
{
}.
% 1 {{2 *} {3 *} {5 *}} pipe
/collect {
{
}.
% 1 {{2 *} {3 *} {5 *}} collect
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/treemap {
[/.tree /.rec] let
end}.
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/ift {
[/.if /.then] let
end}.
% ift - allow stack invariant ifelse condition
/ifte {
[/.if /.then /.else] let
end}.
% switch statement.
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/dip {
[/.v /.q] let
end}.
/apply {exec}.
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/linrec {
[/.if /.then /.rec1 /.rec2] let
end}.
/binrec {
[/.if /.then /.rec1 /.rec2] let
end}.
/genrec {
[/.if /.then /.rec1 /.rec2] let
end}.
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/primrec {
5 dict begin
[/.param /.then /.rec] let*
end}.
/cvstr {
{
%
%
end
} def
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/puts {= (\n) print flush}.
/, {(=============\n)
% set the prompt to something else so that we know initlib is loaded.
/prompt {(>| ) print flush} bind def</syntaxhighlight>
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