完整word版实验四LR1分析法Word文档下载推荐.docx
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(3)接受acc:
当归约到文法符号栈中只剩文法的开始符号S时,并且输入符号串已结束即当前输入符是'
#'
,则为分析成功。
(4)报错:
当遇到状态栈顶为某一状态下出现不该遇到的文法符号时,则报错,说明输入端不是该文法能接受的符号串。
四、实验要求
1、编程时注意编程风格:
空行的使用、注释的使用、缩进的使用等。
2、如果遇到错误的表达式,应输出错误提示信息。
3、程序输入/输出实例:
输入一以#结束的符号串(包括+—*/()i#):
在此位置输入符号串
输出过程如下:
步骤状态栈符号栈剩余输入串动作
10#i+i*i#移进
i+i*i的LR分析过程
步骤
状态栈
符号栈
输入串
动作说明
1
#
i+i*i#
ACTION[0,i]=S5,状态5入栈
05
#i
+i*i#
r6:
F→i归约,GOTO(0,F)=3入栈
3
03
#F
r4:
T→F归约,GOTO(0,T)=3入栈
4
02
#T
r2:
E→T归约,GOTO(0,E)=1入栈
5
01
#E
ACTION[1,+]=S6,状态6入栈
6
016
#E+
i*i#
ACTION[6,i]=S5,状态5入栈
7
0165
#E+i
*i#
F→i归约,GOTO(6,F)=3入栈
8
0163
#E+F
T→F归约,GOTO(6,T)=9入栈
9
0169
#E+T
ACTION[9,*]=S7,状态7入栈
10
01697
#E+T*
i#
ACTION[7,i]=S5,状态5入栈
11
016975
#E+T*i
F→i归约,GOTO(7,F)=10入栈
12
0169710
#E+T*F
r3:
T→T*F归约,GOTO(6,T)=9入栈
13
r1:
E→E+T,GOTO(0,E)=1入栈
14
Acc:
分析成功
4、输入符号串为非法符号串(或者为合法符号串)
算术表达式文法的LR分析表
状
态
ACTION
GOTO
i
+
*
(
)
E
T
F
S5
S4
S6
acc
r2
S7
r4
r6
S11
r1
r3
r5
五、实验源程序
importjavax.swing.*;
importjava.awt.Dimension;
importjavax.swing.JButton;
importjava.awt.Rectangle;
importjava.util.Vector;
importjavax.swing.JTextArea;
importjavax.swing.JTextField;
importjavax.swing.JLabel;
importjavax.swing.JMenuBar;
importjavax.swing.JMenu;
importjavax.swing.JMenuItem;
importjavax.swing.JScrollPane;
importjava.awt.BorderLayout;
importjavax.swing.JDialog;
publicclassLR1extendsJFrame{
privatestaticfinallongserialVersionUID=1L;
//*********************************
privatechar[]VN=newchar[50];
//非终结符集
privatechar[]VT=newchar[50];
//终结符集
privateString[]F=newString[50];
//产生式集
privateStringBuffer[]FirstVN;
//非终结符的First集
privateint[]staStack=newint[50];
//状态分析栈
privatechar[]symStack=newchar[50];
//符号分析栈
privateboolean[]VNE;
//非终结符与空串的关系表
privateintF_index=0;
//产生式数组指针
privateintstaStack_index=0;
//状态栈指针
privateintsymStack_index=0;
//符号栈指针
privateintERROR=Integer.MAX_VALUE;
//出错标志
privatecharemp='
ε'
;
//空串
privateStringerror="
x"
//分析表显示的出错标志//@jve:
decl-index=0:
privateStringacc="
acc"
//分析表显示的分析成功标志
privateVector<
Vector<
String>
>
State=newVector<
();
//项目集//@jve:
privateint[][]Action;
//Action动作数组
privateint[][]Goto;
//Goto动作数组
privateStringBuffer[]bridge1;
//描述项目集之间的转换关系,在createLR1()中初始化
privateint[][]bridge2;
privateJPaneljContentPane=null;
privateJTextAreajTextArea4=null;
privateJTextAreajTextArea3=null;
privateJTextAreajTextArea2=null;
privateJTextAreajTextArea_LR1States=null;
privateJTextAreajTextArea_LR1AnalysisTable=null;
privateJTextFieldjTextField=null;
privateJTextFieldjTextField1=null;
privateJTextFieldjTextField_testedString=null;
privateJLabeljLabel=null;
privateJLabeljLabel1=null;
privateJLabeljLabel_LR1States=null;
privateJLabeljLabel_inputString=null;
privateJButtonjButton_test=null;
privateJButtonjButton_ok=null;
privateJButtonjButton_delete=null;
privateJButtonjButton_clearall=null;
privateJButtonjButton_testPanel=null;
privateJMenuBarjJMenuBar=null;
privateJMenujMenu1=null;
privateJMenuItemjMenuItem1=null;
privateJMenuItemjMenuItem2=null;
privateJScrollPanejScrollPane_LR1States=null;
privateJScrollPanejScrollPane_LR1AnalysisTable=null;
privateJScrollPanejScrollPane2=null;
privateJScrollPanejScrollPane3=null;
privateJScrollPanejScrollPane4=null;
privateJPaneljPanel=null;
privateJPaneljPanel1=null;
privateJLabeljLabel_LR1AnalysisTable=null;
privateJButtonjButton_fresh=null;
privateJButtonjButton_TransFunGraph=null;
privateJFramejFrame_testFrame=null;
//@jve:
visual-constraint="
531,25"
privateJPaneljContentPane_testFrame=null;
privateJDialogjDialog_TG=null;
170,520"
privateJPaneljContentPane_TG=null;
publicLR1(){
super();
initialize();
}
privatevoidinitialize(){
this.setSize(583,483);
this.setJMenuBar(getJJMenuBar());
this.setContentPane(getJContentPane());
this.setTitle("
LR1语法分析"
);
this.setLocation(300,250);
this.setVisible(true);
privateJPanelgetJContentPane(){
if(jContentPane==null){
jContentPane=newJPanel();
jContentPane.setLayout(null);
jContentPane.add(getJPanel(),null);
jContentPane.add(getJPanel1(),null);
}
returnjContentPane;
privateJPanelgetJPanel(){
if(jPanel==null){
jPanel=newJPanel();
jPanel.setLayout(null);
jPanel.setBounds(newRectangle(0,0,210,430));
//jPanel.setBackground(Color.green);
jPanel.add(getJScrollPane4(),null);
jPanel.add(getJScrollPane3(),null);
returnjPanel;
privateJPanelgetJPanel1(){
if(jPanel1==null){
jPanel1=newJPanel();
jPanel1.setLayout(null);
//jPanel1.setBackground(Color.green);
jPanel1.setBounds(newRectangle(210,0,368,430));
jLabel1=newJLabel();
//jLabel1.setForeground(Color.red);
jLabel1.setBounds(newRectangle(120,58,23,24));
jLabel1.setText("
-->
"
jLabel=newJLabel();
//jLabel.setForeground(Color.red);
jLabel.setBounds(newRectangle(16,19,57,23));
jLabel.setText("
产生式:
jPanel1.add(jLabel,null);
jPanel1.add(getJTextField(),null);
jPanel1.add(jLabel1,null);
jPanel1.add(getJTextField1(),null);
jPanel1.add(getJButton_delete(),null);
jPanel1.add(getJButton_ok(),null);
jPanel1.add(getJButton_clearall(),null);
jPanel1.add(getJButton_testPanel(),null);
jPanel1.add(getJScrollPane2(),null);
returnjPanel1;
privateJPanelgetJContentPane_testFrame(){
if(jContentPane_testFrame==null){
jContentPane_testFrame=newJPanel();
jContentPane_testFrame.setLayout(null);
jContentPane_testFrame.setBackground(null);
jContentPane_testFrame.add(getJScrollPane_LR1States(),null);
jContentPane_testFrame.add(getJScrollPane_LR1AnalysisTable(),null);
jLabel_inputString=newJLabel();
jLabel_inputString.setText("
请输入待测句子:
jLabel_inputString.setBounds(newRectangle(29,25,108,18));
jContentPane_testFrame.add(jLabel_inputString,null);
jContentPane_testFrame.add(getJTextField_testedString(),null);
jContentPane_testFrame.add(getJButton_test(),null);
jContentPane_testFrame.add(getJButton_fresh(),null);
jContentPane_testFrame.add(getJButton_TransFunGraph(),null);
jLabel_LR1States=newJLabel();
jLabel_LR1States.setText("
LR1项目集"
jLabel_LR1States.setBounds(newRectangle(11,65,65,18));
jLabel_LR1States.addMouseListener(newjava.awt.event.MouseAdapter(){
publicvoidmouseReleased(java.awt.event.MouseEvente){
jTextArea_LR1States.setText("
//准备数据
createAll();
//显示项目集
displayLR1States();
}
/*publicvoidmouseExited(java.awt.event.MouseEvente){
jLabel_LR1States.setForeground(Color.black);
publicvoidmouseEntered(java.awt.event.MouseEvente){
jLabel_LR1States.setForeground(Color.green);
}*/
});
jContentPane_testFrame.add(jLabel_LR1States,null);
jLabel_LR1AnalysisTable=newJLabel();
jLabel_LR1AnalysisTable.setText("
LR1分析表"
jLabel_LR1AnalysisTable.setBounds(newRectangle(264,67,66,18));
jLabel_LR1AnalysisTable.addMouseListener(newjava.awt.event.MouseAdapter(){
jLabel_LR1AnalysisTable.setForeground(Color.black);
publicvoidmouseEntered(java.awt.event.MouseEvente){
jLabel_LR1AnalysisTable.setForeground(Color.green);
jTextArea_LR1AnalysisTable.setText("
displayLR1AnalysisTable();
jContentPane_testFrame.add(jLabel_LR1AnalysisTable,null);
returnjContentPane_testFrame;
privateJDialoggetJDialog_TG(){
if(jDialog_TG==null){
jDialog_TG=newJDialog();
jDialog_TG.setSize(newDimension(361,266));
//jDialog_TG.setTitle("
LR1状态图"
//jDialog_TG.setBackground(Color.black);
jDialog_TG.setLocationRelativeTo(jFrame_testFrame);
jDialog_TG.setContentPane(getJContentPane_TG());
returnjDialog_TG;
privateJPanelgetJContentPane_TG(){
if(jContentPane_TG==null){
//jContentPane_TG=newTransformGraphPanel();
jContentPane_TG.setLayout(newBorderLayout());
returnjContentPane_TG;
privateJTextFieldgetJTextField(){
if(jTextField==null){
jT