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-
- %{
-
- (* This is a Lex demonstration program taken from the UNIX manual which
- which counts words in a file.
- Usage: lengs <input-file
- This will produce a histogram of word lengths in the input file.
- To compile: lex lengs
- tpc lengs *)
-
- uses LexLib;
-
- var lengs : array [1..100] of Integer;
-
- %}
-
- %%
-
- [a-zA-Z]+ inc(lengs[yyleng]);
- . |
- \n ;
-
- %%
-
- var i : Integer;
-
- begin
- for i := 1 to 100 do lengs[i] := 0;
- if yylex=0 then ;
- writeln('Length':6, ' ':3, 'No. words':6);
- for i := 1 to 100 do if lengs[i]>0 then
- writeln(i:6, ' ':3, lengs[i]:6);
- end.
-