词法语法分析器

大学编译原理实验，语法和词法分析器，包括部分错误处理。 program -> compoundstmt compoundstmt -> { stmts } { stmts -> stmt stmts stmt -> assgstmt assgstmt -> ID = arithexpr ; ID arithexpr -> multexpr arithexprprime multexpr -> simpleexpr multexprprime simpleexpr -> NUM NUM

/**************************************************************************
*作    者：王林
*创建时间：2007-12-16
*描    述：完成
*注意事项：无
*遗 留BUG：无
*修改时间：2007-12-16到2007-12-30
**************************************************************************/

#include “LexicalAnalyzer.h“;

///

///LexicalAnalyzer的构造函数
///

LexicalAnalyzer::LexicalAnalyzer（）{
	row=0;
	lex_beginning=0;
	forward=0;
	state=0;
	start=0;
	linenumber=0;
	lineposition=0;
}
///

///初始化变量
///

///
void LexicalAnalyzer::InitPara（）{
	lex_beginning=0;
	forward=0;
	state=0;
	start=0;
	buffer.clear（）;
}
///

///Check Delimiters
///

///如果是Delimiter，返回true，否则返回false
bool LexicalAnalyzer::checkDelimiters（）{
	if（buffer[forward]==‘{‘||buffer[forward]==‘}‘||buffer[forward]==‘（‘||buffer[forward]==‘）‘||buffer[forward]==‘;‘） return true;
	else return false;
}
///

///Check Compare Operator
///

///如果是Compare Operator，返回true，否则返回false
bool LexicalAnalyzer::check（）{
	if（ buffer[forward]==‘=‘||buffer[forward]==‘>‘||buffer[forward]==‘<‘||buffer[forward]==‘!‘） return true;
	else return false;
}
///

///Check Operator
///

///如果是Operator，返回true，否则返回false
bool LexicalAnalyzer::checkOperators（）{
	if（buffer[forward]==‘+‘||buffer[forward]==‘-‘||buffer[forward]==‘*‘||buffer[forward]==‘/‘） return true;
	else return false;
}
///

///打开输入输出文件
///

///输入文件的路径和文件名
///输出文件的路径和文件名
///如果是C打开成功，返回true，否则返回false
bool LexicalAnalyzer::OpenFile（string infilePathstring outfilePath）{
	input.open（infilePath.c_str（））;
	output.open（outfilePath.c_str（））;
	if （input&&output） return true;
	else return false;
}
///

///关闭输入输出文件
///

///
void LexicalAnalyzer::CloseFile（）{
	input.close（）;
	output.close（）;
}
///

///类型匹配，获得下一个token
///

///返回匹配成功的token，或是错误标识
string LexicalAnalyzer::nexttoken（）{
	while（true）{
		switch（state）{
			case 0:                                          //匹配 “//“
				c=buffer[forward];
				forward++;
				if（isspace（c））{
				    state=0;
				    lex_beginning++;
				}
				else if（c==0）{forward--; return “\n“;}
				else if（c==‘/‘） state=1;
				else state=fail（）;
			    break;
			case 1:
				c=buffer[forward];
				forward++;
				if（c==‘/‘）return “//“;
				else state=fail（）;
				break;         
			case 2:                                       //匹配if，int
				c=buffer[forward];
				if（c==‘i‘）state=3;
				else state=fail（）;
				break;
			case 3:
				forward++;
				c=buffer[forward];
				if（c==‘f‘）{
					forward++;
					if（isspace（buffer[forward]）||buffer[forward]==0||checkDelimiters（）） return “if“;
					if（check（）||checkOperators（）） state=37;                        //error:+-*/<>=! f

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件      98816  2007-12-26 16:00  上机实践报告_词法分析器.doc

     文件     152576  2007-12-26 21:15  上机实践报告_语法分析器.doc

     文件         23  2008-01-03 20:54  email.txt

     文件      77824  2007-12-26 22:07  词法分析器\LexicalAnalyzer\debug\LexicalAnalyzer.exe

     文件     474088  2007-12-26 22:07  词法分析器\LexicalAnalyzer\debug\LexicalAnalyzer.ilk

     文件     560128  2007-12-26 22:07  词法分析器\LexicalAnalyzer\debug\LexicalAnalyzer.pdb

     文件      10294  2007-12-26 22:07  词法分析器\LexicalAnalyzer\LexicalAnalyzer\Debug\BuildLog.htm

     文件        405  2007-12-26 20:03  词法分析器\LexicalAnalyzer\LexicalAnalyzer\Debug\LexicalAnalyzer.exe.embed.manifest

     文件        472  2007-12-26 20:03  词法分析器\LexicalAnalyzer\LexicalAnalyzer\Debug\LexicalAnalyzer.exe.embed.manifest.res

     文件        387  2007-12-26 22:07  词法分析器\LexicalAnalyzer\LexicalAnalyzer\Debug\LexicalAnalyzer.exe.intermediate.manifest

     文件     100995  2007-12-26 22:07  词法分析器\LexicalAnalyzer\LexicalAnalyzer\Debug\LexicalAnalyzer.obj

     文件      46419  2007-12-26 20:03  词法分析器\LexicalAnalyzer\LexicalAnalyzer\Debug\main.obj

     文件         69  2007-12-26 22:07  词法分析器\LexicalAnalyzer\LexicalAnalyzer\Debug\mt.dep

     文件     248832  2007-12-26 22:07  词法分析器\LexicalAnalyzer\LexicalAnalyzer\Debug\vc80.idb

     文件     208896  2007-12-26 22:07  词法分析器\LexicalAnalyzer\LexicalAnalyzer\Debug\vc80.pdb

     文件         82  2007-12-20 10:31  词法分析器\LexicalAnalyzer\LexicalAnalyzer\ffbbx

     文件        397  2007-12-20 00:01  词法分析器\LexicalAnalyzer\LexicalAnalyzer\include.h

     文件      13737  2007-12-26 22:06  词法分析器\LexicalAnalyzer\LexicalAnalyzer\LexicalAnalyzer.cpp

     文件        817  2007-12-20 00:00  词法分析器\LexicalAnalyzer\LexicalAnalyzer\LexicalAnalyzer.h

     文件       4419  2007-12-26 20:08  词法分析器\LexicalAnalyzer\LexicalAnalyzer\LexicalAnalyzer.vcproj

     文件       1411  2007-12-26 22:07  词法分析器\LexicalAnalyzer\LexicalAnalyzer\LexicalAnalyzer.vcproj.ECNU-WL.dream.user

     文件        600  2007-12-20 00:01  词法分析器\LexicalAnalyzer\LexicalAnalyzer\main.cpp

     文件      32768  2007-11-27 15:49  词法分析器\LexicalAnalyzer\LexicalAnalyzer\programming_assignment01－lexical analyzer.doc

     文件        158  2007-12-26 22:07  词法分析器\LexicalAnalyzer\LexicalAnalyzer\tok.txt

     文件          6  2007-12-26 21:59  词法分析器\LexicalAnalyzer\LexicalAnalyzer\toy.txt

     文件    1444864  2007-12-26 22:07  词法分析器\LexicalAnalyzer\LexicalAnalyzer.ncb

     文件        910  2007-12-11 09:44  词法分析器\LexicalAnalyzer\LexicalAnalyzer.sln

    ..A..H.     36864  2007-12-26 22:07  词法分析器\LexicalAnalyzer\LexicalAnalyzer.suo

     文件     286750  2007-12-26 20:02  词法分析器\LexicalAnalyzer.rar

     文件     135168  2007-12-26 21:20  语法分析器\SyntaxAnalyzer\debug\SyntaxAnalyzer.exe

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