wordcount.l

语法分析 语法分析

%{
{*
    下面的例子改编自lex和yacc第二版
    对单词计数

    编译：lex wordcount wordcnt.dpr
    用法: wordcnt 或者 wordcnt wordcount.l
 *}
 program WordCnt;

{$APPTYPE CONSOLE}

uses
  SysUtils, LexLib;
var
  CharCount, WordCount, LineCount:integer;

%}

word [^ \t\n]+
eol  \n

%%
{word}	begin
          inc(WordCount);
	  inc(CharCount,yyleng); 
	end;
{eol}	begin
          inc(CharCount);
	  inc(LineCount);
	end;
.	inc(CharCount);
%%

begin
  if paramcount >1 then
  begin
    if not FileExists(ParamStr(1)) then
    begin
      Writeln('无法打开输入文件');
      Halt;
    end;
    AssignFile(yyinput, ParamStr(1));
    reset(yyinput);
  end;
  yylex;
  Writeln(format('字符数:%d 单词数:%d 行数:%d', [CharCount, WordCount, LineCount]));
  readln;
end.