基于Android的编译原理课程设计：C语言的预处理程序
基于Android的编译原理课程设计：C语言的预处理程序
Cyril-KI
发布于 2022-09-19 06:12:21
发布于 2022-09-19 06:12:21
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代码可运行
前言
考虑到大家最近在做编译原理课设，所以拿出来以供参考！
1.题目要求
设计一个 C 语言的预处理程序，将C语言中所有的宏常量进行计算，并生成另外一个文件，将宏常量展开和计算的结果全部显示出来，最后将定义的宏在源程序中全部进行替换。
例如，源程序为：
#include <stdio.h>
#define ADDR_START 0x20480000
#define ADDR_A ADDR_START + 0x04
#define ADDR_B ADDR_START + 15
#define BUFFER_SIZE 1024
#define BUFFER_END ADDR_START + BUFFER_SIZE – 1
#define PI 3.14
void main()
{
float r, l;
scanf(“%f”, &r);
l = 2 * PI *r;
memset(ADDR_START, BUFFER_SIZE, 0x00);
}替换后为：
#include <stdio.h>
#define ADDR_START 0x20480000
#define ADDR_A 0x20480004
#define ADDR_B 0x2048000F
#define BUFFER_SIZE 1024
#define BUFFER_END 0x204803FF
#define PI 3.14
void main()
{
float r, l;
scanf(“%f”, &r);
l = 2 * 3.14 *r;
memset(0x20480000, 1024, 0x00);
}2.思路分析
2.1 文法设计
我们知道，C 语言中运算符的优先级为：[] > (! ~) > (* / %) > (+ -) > (<< >>) > (> >= < <=) > (== !=) > & > ^ > | > && > || > ?: > (= += -= /= *= %=) > ,(逗号)。
为保证依据设计的文法求得的算符优先矩阵符合上述要求，根据求算符优先矩阵的方法，从优先级别最低的逗号开始逐次往高级别推导，这样算出来的算符优先矩阵就是符合预期的。
比如& < ==，则文法设计为：G->G&H，G->H，H->H==I。可以看到FirstVt(G) = {&, ==}，FirstVt(H) = {==}，而G->G&H，所以& < FirstVt(H)，即& < ==。同理根据LastVt 可得== > &。
表达式文法设计过程中有以下几点需要特别考虑：
1. 推至结尾O时，为了将前后连贯起来，O必须能导出最开始的符号A，同时若A是表达式，则(A)也必然是表达式，于是最后两条产生式为：O->i，O->(A)，文法中用i表征一切变量。
2. 下标运算符[]的设计。下标运算符在C语言中通常与数组结合起来，其标准用法为a[i]，其中a为数组名，i为下标。在上述所有双目运算符中，其产生式都是类似于：A->A&&B这种形式，于是将[]运算符的产生式设计为：N->N[]O，其中N为数组名，O为数组下标。
3. 有了以上前提，在词法分析阶段，要将源程序中所有含有条件运算符以及下标运算符的表达式改写成上述产生式形式。
4. 经过设计，最终文法为：
2.2 表达式的计算
本次课设表达式的计算思路为：不使用属性文法计算，而是将原表达式转为逆波兰式，再进行计算。
2.3 概要设计
事先写好三个待分析的源程序文件，点击Open按钮，可选择打开哪一个源程序，打开后，会马上进行词法分析，得到各种有意义字符串的种别号，然后根据种别号对源程序设置不同的颜色，例如{}为红色，define以及include为粉红色等等（参考了vscode的CPP程序界面）。
接下来点击Lexical按钮，开始进行词法分析。词法分析实际上在源程序打开后就已经结束了，点击Lexical按钮只是做一个展示功能。
词法分析程序的主要任务是对构成源程序的字符串从左到右扫描，逐个字符地读入源程序字符并按照构词规则切分成一个一个具有独立意义的单词，并确定其属性（如关键字、宏常量、标识符等）。
词法分析中将单词分为以下几类：
1.关键字keyWord：由程序语言定义的具有固定意义的标识符，也称为保留字或基本字。如auto、short、typedef等。
2.宏常量MACRO：本次实验的主要目的就是分析宏常量，所以单独定义。
3.一般变量var：用来表示程序中各种名字的字符串。
4.常数number：常数的类型一般有整型、实型、布尔型、文字型。
5.运算符ope：如+、－ 、*、/等。
6.界限符：如逗号、分号、括号等。
7.特殊字符special：C语言在语法上并未将main、include以及define等符号定义为关键字，所以单独列出。
词法分析得到的结果是一个初始符号表，每一个表项都是一个向量，每一个向量表示一个有意义的字符串，比如(SIZE, MACRO, X + Y)，表明SIZE是一个宏常量，其表达式为X + Y。又如(+, 4)表明加法运算符的种别号为4。
接下来点击Grammar按钮，即可进行语法分析。语法分析首先分析的是宏常量的表达式，根据词法分析得到的符号表，找到每一个宏常量的表达式（可以是一个常数，也可以是一个很复杂的表达式），然后将每个表达式中的变量以及常数都用小写字母i替代，因为设计的文法当中默认用i表示操作数。例如SIZE + X / Y 变为i+i/i，然后用算符优先文法来规约这个表达式，并判断是否合法。
宏常量的表达式语法分析完毕后，紧接着分析主函数当中的表达式，对于主函数中的表达式，与宏常量表达式一样，也将除开运算符以外的所有变量用i表示，然后用上述定义的表达式文法进行规约分析。分析完毕后，所有的分析过程在点击Grammar按钮后都会显示在模拟器界面上。
语法分析结束后，最后进行的是表达式计算。点击Calculate按钮，即可对所有经过语法分析并且合法的表达式进行计算。计算时首先将表达式转成逆波兰式，然后利用栈对其进行计算。每计算完一个表达式，就将符号表进行更新，方便下一步的计算，所有表达式的计算过程都会显示在模拟器界面上。
表达式计算完毕之后，开始对源程序进行替换，替换过程与计算过程同步进行：扫描源程序，对宏常量以及相关表达式出现的地方，用计算得到的值进行替换，该值通过扫描符号表得到。替换完毕后，再根据结果变换程序字符串的颜色，显示在模拟器界面上。
3.系统的类图
系统中包含一个主界面MainActivity以及五个子类，分别介绍如下：
1. 主界面MainActivity：主界面中包含两个EditText以及一个RadioGroup，RadioGroup中包含四个RadioButton，分别对应打开文件、词法分析、语法分析以及表达式计算。
2. Grammatical_Analysis类：该类中定义了识别数字以及标识符的文法，其方法booleanisVar(String x)与boolean isNum(string x)分别来判断字符串是否是合法的标识符或者数字。
3. Lexical_Analysis类：词法分析类，该类中定义了所有可能出现的符号以及它们的类别号，并对源程序进行扫描，生成初始符号表。
4. Operator_Precedence类：算符优先分析类，该类中定义了表达式文法。findFirstVt()与findLastVt()用于求解所有非终结符的 FirstVt以及LastVt集合；findRe()根据两个集合建立算符优先矩阵；check(String x)对表达式x进行算符优先分析，并给出规约结果。
5. Compute类：计算类，根据Operator_Precedence类的分析结果，对表达式进行计算。其中：mid2suffix()方法将给出的表达式转成逆波兰式；hex2dec()将计算过程中可能出现的十六进制数转成十进制数；calculateSuffix()用于计算mid2suffix()产生的逆波兰式。
类图如下：
4.界面设计
4.1 主界面
4.2 打开文件
4.3 词法分析
点击词法分析后，编辑器上缩，下方的显示栏显示词法分析结果，如下所示：
4.4 语法分析
点击语法分析按钮，可对源程序中所有表达式进行语法分析，结果如下所示：
4.5 表达式计算
点击表达式计算按钮，可将计算过程显示出来。另外可以看到，源程序中相应位置的代码已经被替换。
5.部分源码
5.1 MainActivity
/**
* Date : 2021/1/5 12:30
* Author : KI
* File : MainActivity
* Desc : main
* Motto : Hungry And Humble
*/
package com.example.compiler;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Color;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.ForegroundColorSpan;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.PopupWindow;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.example.compiler.Utils.CheckAllExpression;
import com.example.compiler.Utils.Compute;
import com.example.compiler.Utils.Lexical_Analysis;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Map;
import java.util.Vector;
public class MainActivity extends AppCompatActivity {
private RadioGroup rg_tab_bar;
private RadioButton rb_open;
private RadioButton rb_lexer;
private RadioButton rb_grammar;
private RadioButton rb_calculate;
private View div;
private EditText editText;
private EditText editTextComp;
private Lexical_Analysis lexical_analysis;
private PopupWindow popupWindow;
public String resourceString = ""; //源程序
public String tab = "";
public Vector<Vector> resVectors = new Vector<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bindViews();
rg_tab_bar.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch (checkedId) {
case R.id.rb_open:
rb_open.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
View view=getLayoutInflater().inflate(R.layout.layout_pop,null);
TextView textView1 = view.findViewById(R.id.s1);
textView1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
popupWindow.dismiss();
resourceString = getResources().getString(R.string.source_1);
//lexical_analysis.show();
SpannableStringBuilder builder = convert(resourceString);
editText.setText(builder);
}
});
TextView textView2 = view.findViewById(R.id.s2);
textView2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
popupWindow.dismiss();
resourceString = getResources().getString(R.string.source_2);
//lexical_analysis.show();
SpannableStringBuilder builder = convert(resourceString);
editText.setText(builder);
}
});
TextView textView3 = view.findViewById(R.id.s3);
textView3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
popupWindow.dismiss();
resourceString = getResources().getString(R.string.source_3);
SpannableStringBuilder builder = convert(resourceString);
editText.setText(builder);
}
});
popupWindow=new PopupWindow(view, rb_open.getWidth(), ViewGroup.LayoutParams.WRAP_CONTENT);
popupWindow.setOutsideTouchable(true);
popupWindow.setFocusable(true);
popupWindow.showAsDropDown(rb_open);
}
});
break;
case R.id.rb_lexer: //词法分析
Lexical();
break;
case R.id.rb_grammar: //语法分析每一个跟宏有关的式子是否是合法的
Grammar();
break;
case R.id.rb_calculate: //计算并替换所有表达式
try {
Calculate();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
break;
}
}
});
}
private void bindViews() {
tab = getResources().getString(R.string.tab);
rg_tab_bar = findViewById(R.id.rg_tab_bar);
rb_open = findViewById(R.id.rb_open);
rb_lexer = findViewById(R.id.rb_lexer);
rb_grammar = findViewById(R.id.rb_grammar);
rb_calculate = findViewById(R.id.rb_calculate);
div = findViewById(R.id.div_tab_bar);
editText = findViewById(R.id.edit);
editTextComp = findViewById(R.id.comp);
}
private SpannableStringBuilder convert(String x) {
String yy = getResources().getString(R.string.source_1);
String []yyStrings = x.split("\n");
for(int i = 0; i < yyStrings.length; i++) {
if(yyStrings[i].contains("main")) {
break;
}
else {
yyStrings[i] = yyStrings[i].trim();
}
}
x = "";
for(int i = 0; i <yyStrings.length; i++) {
x += (yyStrings[i] + "\n");
}
lexical_analysis = new Lexical_Analysis(yy);
lexical_analysis.initNum();
lexical_analysis.mainFunc();
SpannableStringBuilder builder = new SpannableStringBuilder(x);
for(int i = 0; i < x.length(); i++) {
char y = x.charAt(i);
if (y == '{' || y == '}' || y == '(' || y == ')') {
builder.setSpan(new ForegroundColorSpan(Color.RED), i, i + 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);//指定索引a到b-1的字符
}
if (y == '#' && x.charAt(i + 1) == 'i') {
builder.setSpan(new ForegroundColorSpan(Color.rgb(204, 51, 204)), i, i + 8, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);//指定索引a到b-1的字符
int j = i + 8;
while (x.charAt(i) != '>') {
i++;
}
builder.setSpan(new ForegroundColorSpan(Color.rgb(153, 102, 113)), j + 1, i, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
if (y == '#' && x.charAt(i + 1) == 'd') {
builder.setSpan(new ForegroundColorSpan(Color.rgb(204, 51, 204)), i, i + 7, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
for(String xString : lexical_analysis.keyWord) {
int index = 0;
while(index != -1) {
index = x.indexOf(xString, index + xString.length());
if(index != -1) {
builder.setSpan(new ForegroundColorSpan(Color.rgb(26, 107, 230)), index, index + xString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
}
for(String xString : lexical_analysis.keyWord) {
int index = 0;
while(index != -1) {
index = x.indexOf(xString, index + xString.length());
if(index != -1) {
builder.setSpan(new ForegroundColorSpan(Color.rgb(26, 107, 230)), index, index + xString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
}
int index1 = x.indexOf("main");
builder.setSpan(new ForegroundColorSpan(Color.rgb(213, 213, 43)), index1, index1 + 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
for(String xString : lexical_analysis.function) {
int index = x.indexOf(xString);
if(index != -1) {
builder.setSpan(new ForegroundColorSpan(Color.rgb(213, 213, 43)), index, index + xString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
//宏常量
ArrayList<String> temp = new ArrayList<>();
for(Vector<String> vector : lexical_analysis.resVector) {
if(vector.get(1).equals("MACRO")) {
temp.add(vector.get(0));
}
}
System.out.println("temp = " + temp.size());
for(String xString : temp) {
int index = 0 - xString.length();
while(index != -1) {
index = x.indexOf(xString, index + xString.length());
if(index != -1) {
builder.setSpan(new ForegroundColorSpan(Color.rgb(26, 107, 230)), index, index + xString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
}
return builder;
}
//词法分析
private void Lexical() {
lexical_analysis = new Lexical_Analysis(resourceString);
lexical_analysis.initNum();
lexical_analysis.mainFunc();
String finalString = "";
for(Vector vector : lexical_analysis.resVector) {
//System.out.print("(");
String temp = "(";
for(int j = 0; j < vector.size() - 1; j++) {
//System.out.print(vector.get(j) + "," + " ");
temp += (vector.get(j) + "," + " ");
}
//System.out.println(vector.get(vector.size() - 1) + ")");
temp += (vector.get(vector.size() - 1) + ")" + "\n");
finalString += temp;
}
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) editText.getLayoutParams();
lp.height = 500;
editText.setLayoutParams(lp);
RelativeLayout.LayoutParams lp1 = (RelativeLayout.LayoutParams) editTextComp.getLayoutParams();
lp1.height = 2000;
editTextComp.setLayoutParams(lp1);
finalString = "词法分析结果为:" + "\n" + finalString;
SpannableStringBuilder builder1 = new SpannableStringBuilder(finalString);
builder1.setSpan(new ForegroundColorSpan(Color.RED), 0, 8, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);//指定索引a到b-1的字符
editTextComp.setText(builder1);
}
//语法分析
private void Grammar() {
CheckAllExpression checkAllExpression = new CheckAllExpression(resourceString, tab);
checkAllExpression.checkMacro();
checkAllExpression.checkMain();
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) editText.getLayoutParams();
lp.height = 500;
editText.setLayoutParams(lp);
RelativeLayout.LayoutParams lp1 = (RelativeLayout.LayoutParams) editTextComp.getLayoutParams();
lp1.height = 1800;
editTextComp.setLayoutParams(lp1);
String finalString = checkAllExpression.resString;
finalString = "语法分析结果为:" + "\n" + finalString;
SpannableStringBuilder builder1 = new SpannableStringBuilder(finalString);
builder1.setSpan(new ForegroundColorSpan(Color.RED), 0, 8, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);//指定索引a到b-1的字符
editTextComp.setText(builder1);
}
private void Calculate() throws FileNotFoundException {
lexical_analysis = new Lexical_Analysis(resourceString);
lexical_analysis.initNum();
lexical_analysis.mainFunc();
resVectors = lexical_analysis.resVector;
String showProcess = "";
CheckAllExpression checkAllExpression = new CheckAllExpression(resourceString, "");
checkAllExpression.checkMacro();
checkAllExpression.checkMain();
Map<String, String> expMap = checkAllExpression.expMap; //存储表达式
for(Map.Entry<String, String> entry : expMap.entrySet()) {
String keyString = entry.getKey();
String valueString = entry.getValue();
//System.out.println(keyString + ":" + valueString);
if(!keyString.equals("mainExp")) {
String waitString = valueString.replace(" ", "");
showProcess += ("正在计算的宏常量：" + keyString + "\n");
showProcess += ("宏常量表达式：" + valueString + "\n");
System.out.println("正在计算的宏常量：" + keyString);
System.out.println("宏常量表达式：" + valueString);
//System.out.println(waitString);
waitString = Compute.hex2dec(waitString);
//System.out.println(waitString);
Compute compute = new Compute(waitString, resourceString);
compute.lexical_Analysis.resVector = resVectors;
String suffixString = compute.mid2suffix();
showProcess += ("逆波兰式：" + suffixString + "\n");
System.out.println("逆波兰式：" + suffixString);
//System.out.println("suffix:" + suffixString);
String resString = compute.calculateSuffix(suffixString);
showProcess += compute.processString;
showProcess += ("计算结果：" + resString + "\n" + "\n");
System.out.println("计算结果：" + resString);
System.out.println();
for(int i = 0; i < resVectors.size(); i++) {
Vector<String> vector = resVectors.get(i);
if(vector.get(0).equals(keyString)) {
//System.out.println("当前被替换的宏常量为:" + keyString + " " + resString);
resVectors.get(i).set(2, resString);
}else {
continue;
}
}
}
}
//计算主函数中表达式
System.out.println("计算主函数中表达式:");
ArrayList<String> mainExpArrayList = checkAllExpression.mainExpArrayList;
for(String valueString : mainExpArrayList) {
if(valueString.contains("PI")) {
continue;
}
String waitString = valueString.replace(" ", "");
showProcess += ("正在计算的表达式：" + valueString + "\n");
System.out.println("正在计算的表达式：" + valueString);
//System.out.println(waitString);
waitString = Compute.hex2dec(waitString);
//System.out.println(waitString);
Compute compute = new Compute(waitString, resourceString);
compute.lexical_Analysis.resVector = resVectors;
String suffixString = compute.mid2suffix();
showProcess += ("逆波兰式：" + suffixString);
System.out.println("逆波兰式：" + suffixString);
//System.out.println("suffix:" + suffixString);
String resString = compute.calculateSuffix(suffixString);
showProcess += ("计算结果：" + resString + "\n" + "\n");
System.out.println("计算结果：" + resString);
System.out.println();
for(int i = 0; i < resVectors.size(); i++) {
Vector<String> vector = resVectors.get(i);
if(waitString.contains(vector.get(0)) && vector.get(1).equals("var") || waitString.contains(vector.get(0)) && vector.get(1).equals("const")) {
//先找到resString中的答案
int index = resString.indexOf('=');
String real = resString.substring(index + 2, resString.length());
resVectors.get(i).add(real);
resVectors.get(i).set(1, "const");
}
}
}
//replace Macro
for(int i = 0; i < resourceString.length(); i++) {
if(resourceString.charAt(i) == '#' && i + 1 < resourceString.length() && resourceString.charAt(i + 1) == 'd') {
//当前位置为#define
i += 7; //当前位置为e后面的空格
while(resourceString.charAt(i) == ' ') {
i++;
}//结束后位置为一个宏变量的开始符号
int j = i;
int k = i;
while(resourceString.charAt(i) != ' ') {
i++;
}//当前位置为变量后第一个空格
String macroString = resourceString.substring(j, i);
//System.out.println("待替换的变量为:" + macroString);
String replaceString = "";
for(Vector vector : resVectors) {
if(vector.get(0).equals(macroString)) {
replaceString = (String) vector.get(2);
//System.out.println(macroString + "替换为:" + replaceString);
break;
}
}
while(resourceString.charAt(i) == ' ') {
i++;
}//当前结束为表达式第一个字符的位置
j = i;
while(resourceString.charAt(i) != '\n') {
i++;
}
StringBuilder builder = new StringBuilder(resourceString);
builder.replace(j, i, replaceString);
resourceString = builder.toString();
i = k;
continue;
}
}
int mainIndex = 0;
for(int i = 0; i < resourceString.length(); i++) {
if(resourceString.substring(i, i + 4).equals("main")) {
mainIndex = i;
break;
}
}
String finalX = resourceString.substring(0, mainIndex);
String finalY = resourceString.substring(mainIndex, resourceString.length());
//替换主函数中的宏
boolean flag = false;
while(true) {
flag = false;
for(Vector vector : resVectors) {
if(vector.get(1).equals("MACRO")) {
String macroString = (String) vector.get(0);
int index = finalY.indexOf(macroString);
if(index != -1) {
flag = true;
StringBuilder builder = new StringBuilder(finalY);
builder.replace(index, index + macroString.length(), (String) vector.get(2));
finalY = builder.toString();
}
}
}
if(!flag) {
break;
}
}
//替换主函数中的表达式
int index = 0;
resourceString = finalX + finalY;
String []subStrings = resourceString.split("\n");
for(int i = 0; i < subStrings.length; i++) {
if(subStrings[i].contains("define")) {
continue;
}
if(subStrings[i].contains("=") && !subStrings[i].contains("3.14")) {
int j = 0;
//System.out.println("主函数中待替换: " + subStrings[i]);
while (subStrings[i].charAt(j) == '\t' || subStrings[i].charAt(j) == ' ') {
j++;
}//当前位置变量起始位置
int k = j;
while (subStrings[i].charAt(j) != ' ') {
j++;
}//当前位置变量结束
String varString = subStrings[i].substring(k, j);
String replaceString = "";
//search value
for(Vector<String> vector : resVectors) {
if(vector.get(0).equals(varString)) {
replaceString = vector.get(2 + index++);
break;
}
}
subStrings[i] = subStrings[i].substring(0, k) + varString + " = " +
replaceString;
}
}
resourceString = "";
for(String xString : subStrings) {
resourceString += (xString + "\n");
}
System.out.println("替换结束了");
System.out.println(resourceString);
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) editText.getLayoutParams();
lp.height = 1000;
editText.setLayoutParams(lp);
RelativeLayout.LayoutParams lp1 = (RelativeLayout.LayoutParams) editTextComp.getLayoutParams();
lp1.height = 1300;
editTextComp.setLayoutParams(lp1);
SpannableStringBuilder builder = convert(resourceString);
editText.setText(builder);
editTextComp.setText(showProcess);
}
}5.2 表达式检验
/**
* Date : 2021/1/5 12:30
* Author : KI
* File : CheckAllExpression
* Desc : check expression
* Motto : Hungry And Humble
*/
package com.example.compiler.Utils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Vector;
public class CheckAllExpression {
public Map<String, String> expMap = new LinkedHashMap<String, String>();
String tab = "";
public String resString = "";
public ArrayList<String> mainExpArrayList = new ArrayList<>();
Lexical_Analysis lexical_Analysis;
Grammatical_Analysis grammatical_Analysis;
Operator_Precedence operator_Precedence;
ArrayList<String> Vt = new ArrayList<String>(Arrays.asList(
",", "=", "+=", "-=", "*=", "/=", "%=", "||", "&&", "|", "^", "&", "=", "!=",
">", ">=", "<", "<=", "<<", ">>", "+", "-", "*", "/", "%", "!", "[]",
"(", ")", "i", "#")); //规定一个顺序
ArrayList<String> Vn = new ArrayList<String>(Arrays.asList(
"S", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N"));
String []proRule = {"S->#A#", "A->A,B", "A->B", "B->C=B", "B->C+=B",
"B->C-=B", "B->C*=B", "B->C/=B", "B->C%=B", "B->C", "C->C||D", "C->D",
"D->D&&E", "D->E", "E->E|F", "E->F", "F->F^G", "F->G", "G->G&H",
"G->H", "H->H=I", "H->H!=I", "H->I", "I->I>J", "I->I>=J", "I->I<J",
"I->I<=J", "I->J", "J->J<<K", "J->J>>K", "J->K", "K->K+L", "K->K-L",
"K->L", "L->L*M", "L->L/M", "L->L%M", "L->M", "M->!M", "M->N", "N->N[]N",
"N->(A)", "N->i"};
String procedure = "";
public CheckAllExpression(String procedure, String tab) {
this.tab = tab;
lexical_Analysis = new Lexical_Analysis(procedure);
lexical_Analysis.initNum();
lexical_Analysis.mainFunc();
this.procedure = procedure;
grammatical_Analysis = new Grammatical_Analysis();
operator_Precedence = new Operator_Precedence(Vn, Vt, proRule, tab);
}
public String convert(String xString) {
xString = xString.trim();
String resString = "";
for(int i = 0; i < xString.length(); i++) {
char char1 = xString.charAt(i);
if(char1 == '(') {
xString = xString.substring(0, i + 1) + " " + xString.substring(i + 1, xString.length());
i++;
}
if(char1 == ')') {
xString = xString.substring(0, i) + " " + xString.substring(i, xString.length());
i++;
}
}
String list[] = xString.split(" ");
for(String yString : list) {
if(yString.equals("(") || yString.equals(")") || Vt.contains(yString)) {
resString += yString;
}else {
resString += "i";
}
}
return resString;
}
public boolean checkMacro() {
//convert("(ADD_t + (FR * tt + 100))");
//先检查所有宏表达式定义的
boolean resFlag = true;
String []lineStrings = procedure.split("\n");
ArrayList<String> tempArrayList = new ArrayList<String>();
for(int k = 0; k < lineStrings.length; k++) {
String xString = lineStrings[k];
if(!xString.contains("define")) {
continue;
}
if(xString.contains("define") && k + 1 < lineStrings.length && !lineStrings[k + 1].contains("main")) {
//说明为宏定义语句
for(int i = 0; i < lexical_Analysis.resVector.size(); i++) {
Vector<String> vector = lexical_Analysis.resVector.get(i);
if(vector.get(1).equals("MACRO") && !tempArrayList.contains(vector.get(0))) {
tempArrayList.add(vector.get(0));
String waitString = vector.get(2); //待分析的表达式
resString += ("待分析的宏常量:" + vector.get(0) + "\n");
resString += ("待分析的表达式:" + waitString + "\n");
System.out.println("待分析的宏常量:" + vector.get(0));
System.out.println("待分析的表达式:" + waitString);
expMap.put(vector.get(0), waitString);
waitString = convert(waitString);
resString += ("转换后:" + waitString + "\n");
System.out.println("转换后:" + waitString);
operator_Precedence.processString = "";
boolean flag = operator_Precedence.check(waitString);
resString += operator_Precedence.processString;
operator_Precedence.processString = "";
if(flag) {
resString += ("Successful!" + "\n" + "\n");
System.out.println("Successful!");
System.out.println();
}else {
resFlag = false;
resString += ("failed!" + "\n" + "\n");
System.out.println("failed!");
System.out.println();
}
}
}
}
}
return resFlag;
}
public boolean checkMain() {
boolean resFlag = true;
String []lineStrings = procedure.split("\n");
flag:for(String xString : lineStrings) {
if(xString.contains("define") || xString.contains("include") || xString.contains("main") || xString.contains("{") || xString.contains("}")) {
continue;
}
for(String yString : lexical_Analysis.keyWord) {
if(xString.contains(yString)) {
continue flag;
}
}
for(String yString : lexical_Analysis.function) {
if(xString.contains(yString)) {
continue flag;
}
}
resString += ("待分析的句子:" + xString + "\n");
System.out.println("待分析的句子:" + xString);
mainExpArrayList.add(xString);
xString = convert(xString);
resString += ("转换后:" + xString + "\n");
System.out.println("转换后:" + xString);
operator_Precedence.processString = "";
boolean flag = operator_Precedence.check(xString);
resString += operator_Precedence.processString;
operator_Precedence.processString = "";
if(flag) {
resString += ("Successful!" + "\n" + "\n");
System.out.println("Successful!");
System.out.println();
}else {
resString += ("failed!" + "\n" + "\n");
resFlag = false;
System.out.println("failed!");
System.out.println();
}
}
return resFlag;
}
}本文参与 腾讯云自媒体同步曝光计划，分享自微信公众号。
原始发表：2021-12-07，如有侵权请联系 cloudcommunity@tencent.com 删除
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