sentence.y

语法分析 语法分析

%{
{*
 * 识别简单英语句子的yacc程序
   编译：yacc sentence sentenceyacc.dpr
 *}
program SentenceYacc;

{$APPTYPE CONSOLE}

uses
  SysUtils, LexLib, YaccLib, Sentence;

%}

%token Noun Pron Verb Adv Adj Prep Conj

%%
sentence: subject Verb object	{writeln('句子有效');//注意在yacc中的附加的代码必须加花括号, lex中可以不加}
	;

subject:	Noun
	|	Pron
	;

object:		Noun
	;
%%

begin
  if yyparse=0 then { 结束 };
end.