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Parser.java
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import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import static java.lang.System.exit;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;
/**
*
* @author wangjs
*/
//This class is used to make the grammar checking, semantic analysis and code generation.
//The symbol tables will also be created in this class
public class Parser {
//symbolTables[0] = classStaticVariableSymbolTable
//symbolTables[1] = classFieldVariableSymbolTable
//symbolTables[2] = functionVarSymbolTable
//symbolTables[3] = functionArgumentSymbolTable
//symbolTables[4] = otherClassFunctionsSymbolTable
private Lexer lexer = null;
private SymbolTable[] symbolTables = new SymbolTable[5];
private String textContent = null;
private JackClasses jackClasses = null;
private String Type = "int|char|boolean|ID|void|String|Array";
private String otherClassType = "";
private File vmFile = null;
private String className = "";
private String expressionReturnType = "";
private String functionName = "";
private String subroutineKind = "";
private String returnType = "";
private String oldToken = "";
private String lastFunctionName = "";
private boolean arrayInitOrNot = false;
private boolean constructorOrNot = false;
private boolean methodOrNot = false;
private int ifCounter = 0;
private int whileCounter = 0;
private int pushCounter = 0;
private int eleNumberCounter = 0;
private Map classFieldVar = new HashMap();
private Map classArrayNumOfEle = new HashMap();
private Map functionArrayNumOfEle = new HashMap();
//Initialize the lexer and each symboltable
public Parser(Lexer lexer) {
this.lexer = lexer;
lexer.initLocalFile();
symbolTables[0] = new SymbolTable();
symbolTables[1] = new SymbolTable();
symbolTables[2] = new SymbolTable();
symbolTables[3] = new SymbolTable();
symbolTables[4] = new SymbolTable();
textContent = this.lexer.getTextContent();
jackClasses = new JackClasses();
parserAnalysis();
}
//Create the VM file if it not exists currently
private void vmFileCreate() {
try {
vmFile = new File(lexer.getFolderPath() + File.separator + className + ".vm");
if (!vmFile.exists()) {
vmFile.createNewFile();
}
} catch (Exception e) {
e.printStackTrace();
}
}
//Insert the VM codes into the VM file
private void vmCodeInput(String vmCodes) {
try {
File log = new File(lexer.getFolderPath() + File.separator + className + ".vm");
FileWriter fileWriter = new FileWriter(log.getAbsoluteFile(), true);
BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
bufferedWriter.write(vmCodes);
bufferedWriter.close();
fileWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
//Output the error information and terminate the execution of the parser
private void error(String errorInfor) {
System.out.printf("%s\n", errorInfor);
exit(0);
}
//Check if the class used in current Jack source codes exists in the local folder
private boolean localFileCheck(String className) {
try {
className += ".jack";
File files = new File(lexer.getFolderPath());
File[] allFile = files.listFiles();
for (File f : allFile) {
if (f.isFile()) {
if (className.equals(f.getName())) {
return true;
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
//Clear the values of the temporary variables in the symbol tables
private void symbolTableVarClear() {
for (SymbolTable symbolTable : symbolTables) {
symbolTable.memorySegment = "";
symbolTable.dataType = "";
symbolTable.returnType = "";
symbolTable.functionType = "";
symbolTable.numOfArgs = 0;
symbolTable.numOfVar = 0;
symbolTable.offset = 0;
symbolTable.initOrNot = false;
}
}
//Exact tokens from the lexical analyser and call the corresponding proecessing methods
private void parserAnalysis() {
try {
while (lexer.getReadIndex() < textContent.length() - 2) {
//Identify the token to call corresponding methods
Token newToken = lexer.GetNextToken();
if (newToken.Token.equals("class")) {
classCheck();
vmFileCreate();
ClassesFunctionsReference();
} else if (newToken.Token.equals("constructor")
|| newToken.Token.equals("function")
|| newToken.Token.equals("method")) {
if (!functionName.equals(lastFunctionName)) {
error("Error: in class: " + className + ", function \""
+ functionName + "\" doesn't have return statement");
}
if (newToken.Token.equals("method")) {
methodOrNot = true;
} else if (newToken.Token.equals("constructor")) {
constructorOrNot = true;
}
subroutineKind = newToken.Token;
functionCheck();
} else if (newToken.Token.equals("field")) {
classVarDeclarCheck();
} else if (newToken.Token.equals("var")) {
functionVarDeclarCheck();
} else if (newToken.Token.equals("let")) {
letStatementCheck();
} else if (newToken.Token.equals("if")) {
ifStatementCheck();
} else if (newToken.Token.equals("while")) {
whileStatementCheck();
} else if (newToken.Token.equals("do")) {
doStatementCheck();
} else if (newToken.Token.equals("return")) {
lastFunctionName = functionName;
returnStatementCheck();
}
}
if (!functionName.equals(lastFunctionName)) {
error("Error: function \"" + functionName
+ "\" doesn't have return statement");
}
} catch (Exception e) {
e.printStackTrace();
}
}
//Check if the format of the class is correct
private void classCheck() {
Token lastToken = null;
if (!lexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + className + ", identifier is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
className = lexer.PeekNextToken().Token;
Type += ("|" + className);
otherClassType += className;
lexer.GetNextToken();
}
//Check the grammar of the source codes between the braces
if (!lexer.PeekNextToken().Token.equals("{")) {
error("Error: in class: " + className + ", \"{\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
lexer.GetNextToken();
}
//Record the current index for recovering
int oldIndex = lexer.getReadIndex();
Lexer.newLineCheck = false;
//Get the last token
while (lexer.getReadIndex() < textContent.length() - 2) {
if (!lexer.PeekNextToken().Token.equals("")) {
lastToken = lexer.PeekNextToken();
}
lexer.GetNextToken();
}
//Recover the index to the original value
lexer.setReadIndex(oldIndex);
Lexer.newLineCheck = true;
//Check if the last token is right brace
if (!lastToken.Token.equals("}")) {
error("Error: in class: " + className + ", \"}\" is expected, line: "
+ lastToken.LineNumber);
}
}
/*Declare a new lexer and exact each token from source codes to find all
other classes used in current source codes. Then call the methods to search
their variables and methods.*/
private void ClassesFunctionsReference() {
Lexer classCheckLexer = new Lexer(className + ".jack");
classCheckLexer.initLocalFile();
//Read all tokens from source codes to find all kinds of variables
while (classCheckLexer.getReadIndex() < classCheckLexer.getTextContent().length() - 2) {
if (classCheckLexer.PeekNextToken().Token.equals("var")
|| classCheckLexer.PeekNextToken().Token.equals("field")
|| classCheckLexer.PeekNextToken().Token.equals("static")) {
classCheckLexer.GetNextToken();
boolean jackLibrariesOrNot = false;
for (String library : jackClasses.jackLibraries) {
if (classCheckLexer.PeekNextToken().Token.equals(library)) {
jackLibrariesOrNot = true;
break;
}
}
//If the data type is not pre-defined or Jack libraries
if (!jackLibrariesOrNot) {
Type += ("|" + classCheckLexer.PeekNextToken().Token);
otherClassType += ("|" + classCheckLexer.PeekNextToken().Token);
if (!classCheckLexer.PeekNextToken().Token.equals(className)) {
classFunctionsCheck(classCheckLexer.PeekNextToken().Token);
classStaticDeclarCheck(classCheckLexer.PeekNextToken().Token);
}
}
}
classCheckLexer.GetNextToken();
}
classFunctionsCheck(className);
classStaticDeclarCheck(className);
}
//This method is used to search and record all subroutines in the current class
private void classFunctionsCheck(String name) {
Pattern pattern = Pattern.compile(Type);
ArrayList<String> fieldVars = new ArrayList<String>();
Token lastToken = null;
String functionType = "";
String dataType = "";
//Declare a new lexer to get the tokens
Lexer temLexer = new Lexer(name + ".jack");
temLexer.initLocalFile();
/*Construct a loop to supervise the value of index for terminating the loop
when end of source codes have been reached.*/
while (temLexer.getReadIndex() < temLexer.getTextContent().length() - 2) {
//Store all fields belonging to the current class
if (temLexer.PeekNextToken().Token.equals("field")) {
temLexer.GetNextToken();
if (!(pattern.matcher(temLexer.PeekNextToken().Token).matches()
|| localFileCheck(temLexer.PeekNextToken().Token))) {
error("Error: in class: " + name + ", keyword is expected, line: "
+ temLexer.GetNextToken().LineNumber);
} else {
dataType = temLexer.PeekNextToken().Token;
temLexer.GetNextToken();
}
while (true) {
if (!temLexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + name + ", identifier is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
} else {
fieldVars.add(dataType);
temLexer.GetNextToken();
}
if (!temLexer.PeekNextToken().Token.equals(",")) {
break;
} else {
temLexer.GetNextToken();
}
}
if (!temLexer.PeekNextToken().Token.equals(";")) {
error("Error: in class: " + name + ", \";\" is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
}
/*Store the information of all subroutines into the symbol table and
check if the grammar of these subroutines are correct*/
} else if (temLexer.PeekNextToken().Token.equals("function")
|| temLexer.PeekNextToken().Token.equals("method")
|| temLexer.PeekNextToken().Token.equals("constructor")) {
functionType = temLexer.PeekNextToken().Token;
temLexer.GetNextToken();
int numOfVar = 0;
String localFunctionName = "";
String localReturnType = "";
ArrayList<String> argumentsDataType = new ArrayList<String>();
if (!pattern.matcher(temLexer.PeekNextToken().Token).matches()
&& !pattern.matcher(temLexer.PeekNextToken().Type.toString()).matches()) {
error("Error: in class: " + name + ", keyword is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
} else {
localReturnType = temLexer.PeekNextToken().Token;
temLexer.GetNextToken();
}
if (!temLexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + name + ", identifier is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
} else {
localFunctionName = temLexer.PeekNextToken().Token;
temLexer.GetNextToken();
}
//Check if the grammar in the argument list is correct
if (!temLexer.PeekNextToken().Token.equals("(")) {
error("Error: in class: " + name + ", \"(\" is expected, line: "
+ temLexer.GetNextToken().LineNumber);
} else {
temLexer.GetNextToken();
while (!temLexer.PeekNextToken().Token.equals(")")) {
if (!pattern.matcher(temLexer.PeekNextToken().Token).matches()
&& !pattern.matcher(temLexer.PeekNextToken().Type.toString()).matches()) {
error("Error: in class: " + name + ", keyword is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
} else {
//Store the data type can be accepted for type conversion
if (temLexer.PeekNextToken().Token.equals("Array")) {
argumentsDataType.add("(int|Array|class|null|all)");
} else if (temLexer.PeekNextToken().Token.equals("String")) {
argumentsDataType.add("(String|null|all)");
} else if (temLexer.PeekNextToken().Token.equals("char")) {
argumentsDataType.add("(int|char|all)");
} else if (temLexer.PeekNextToken().Token.equals("boolean")) {
argumentsDataType.add("(int|boolean|all)");
} else if (temLexer.PeekNextToken().Token.equals("int")) {
argumentsDataType.add("(int|all)");
} else {
argumentsDataType.add("(" + temLexer.PeekNextToken().Token + "|null|Array)");
}
temLexer.GetNextToken();
}
if (!temLexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + name + ", identifier is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
} else {
temLexer.GetNextToken();
}
if (!temLexer.PeekNextToken().Token.equals(",")) {
break;
} else {
temLexer.GetNextToken();
}
}
if (!temLexer.PeekNextToken().Token.equals(")")) {
error("Error: in class: " + name + ", \")\" is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
} else {
temLexer.GetNextToken();
}
}
/*Check if the grammar of braces are correct and count the number
of the local variables in the braces used in the code generation*/
if (!temLexer.PeekNextToken().Token.equals("{")) {
error("Error: in class: " + name + ", \"{\" is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
} else {
int counterLB = 0;
int counterRB = 0;
int oldIndex = 0;
int result = 0;
counterLB++;
temLexer.GetNextToken();
oldIndex = temLexer.getReadIndex();
temLexer.newLineCheck = false;
//Count the number of local variables
while (temLexer.getReadIndex() < temLexer.getTextContent().length() - 2) {
if (temLexer.PeekNextToken().Token.equals("var")) {
temLexer.GetNextToken();
if (!pattern.matcher(temLexer.PeekNextToken().Token).matches()) {
error("Error: in class: " + name + ", keyword is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
} else {
temLexer.GetNextToken();
}
while (true) {
if (!temLexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + name + ", identifier is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
} else {
numOfVar++;
temLexer.GetNextToken();
}
if (!temLexer.PeekNextToken().Token.equals(",")) {
break;
} else {
temLexer.GetNextToken();
}
}
if (!temLexer.PeekNextToken().Token.equals(";")) {
error("Error: in class: " + name + ", \";\" is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
}
}
if (temLexer.PeekNextToken().Token.equals("{")) {
counterLB++;
} else if (temLexer.PeekNextToken().Token.equals("}")) {
counterRB++;
}
lastToken = temLexer.GetNextToken();
if (counterLB == counterRB) {
result = 1;
break;
}
}
if (result == 0) {
error("Error: in class: " + name + ", \"}\" is expected, line: "
+ temLexer.PeekNextToken().LineNumber);
}
temLexer.setReadIndex(oldIndex);
temLexer.newLineCheck = true;
}
//Store the information of subroutines into the symbol table
if (symbolTables[4].findFunctionSymbol(name + "." + localFunctionName)) {
error("Error: in class: " + name + ", function redeclaration, line:"
+ temLexer.PeekNextToken().LineNumber);
} else {
if (functionType.equals("function")) {
symbolTables[4].addFunctionSymbolTable(name + "."
+ localFunctionName, Symbol.SymbolType.function,
argumentsDataType, localReturnType, numOfVar);
} else if (functionType.equals("method")) {
symbolTables[4].addFunctionSymbolTable(name + "."
+ localFunctionName, Symbol.SymbolType.method,
argumentsDataType, localReturnType, numOfVar);
} else {
symbolTables[4].addFunctionSymbolTable(name + "."
+ localFunctionName, Symbol.SymbolType.constructor,
argumentsDataType, localReturnType, numOfVar);
}
}
}
temLexer.GetNextToken();
}
//Store the arraylist used to store the field variables into a dictionary
classFieldVar.put(name, fieldVars);
}
//This method is used to check if the grammar of subroutine in current class is correct
private void functionCheck() throws Exception {
symbolTables[2].setCounter(0);
symbolTables[3].setCounter(0);
symbolTables[2].symbols.clear();
symbolTables[3].symbols.clear();
functionArrayNumOfEle.clear();
ifCounter = 0;
whileCounter = 0;
//If current subroutine is a method, the first argument should be 'this'
if (methodOrNot) {
symbolTables[3].addIdentifierSymbolTable("this",
Symbol.SymbolType.argument, className, className, "this");
}
//Check the grammar of the definition of subroutine
Pattern pattern = Pattern.compile(Type);
if (!pattern.matcher(lexer.PeekNextToken().Token).matches()
&& !pattern.matcher(lexer.PeekNextToken().Type.toString()).matches()) {
error("Error: in class: " + className + ", keyword is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
returnType = lexer.PeekNextToken().Token;
lexer.GetNextToken();
}
if (!lexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + className + ", identifier is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
functionName = lexer.PeekNextToken().Token;
lexer.GetNextToken();
}
//Check the grammar of the argument list
if (!lexer.PeekNextToken().Token.equals("(")) {
error("Error: in class: " + className + ", \"(\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
lexer.GetNextToken();
while (!lexer.PeekNextToken().Token.equals(")")) {
String assignArgumentType = "";
String beAssignedArgumentType = "";
if (!pattern.matcher(lexer.PeekNextToken().Token).matches()
&& !pattern.matcher(lexer.PeekNextToken().Type.toString()).matches()) {
error("Error: in class: " + className + ", keyword is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
//Store all the data types can be accepted for type conversion
assignArgumentType = lexer.PeekNextToken().Token;
if (assignArgumentType.equals("Array")) {
beAssignedArgumentType = "(int|Array)";
} else if (assignArgumentType.equals("String")) {
beAssignedArgumentType = "(String|null)";
} else if (assignArgumentType.equals("char")) {
beAssignedArgumentType = "(int|char)";
} else if (assignArgumentType.equals("boolean")) {
beAssignedArgumentType = "(int|boolean)";
} else if (assignArgumentType.equals("int")) {
beAssignedArgumentType = assignArgumentType;
} else {
beAssignedArgumentType = "(" + assignArgumentType + "|null|Array)";
}
lexer.GetNextToken();
}
if (!lexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + className + ", identifier is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
if (symbolTables[3].findIdentifierSymbol(lexer.PeekNextToken().Token)) {
error("Error: in class: " + className + ", argument redeclaration, line:"
+ lexer.PeekNextToken().LineNumber);
} else {
symbolTables[3].addIdentifierSymbolTable(lexer.PeekNextToken().Token,
Symbol.SymbolType.argument, assignArgumentType, beAssignedArgumentType, "argument");
}
lexer.GetNextToken();
}
if (!lexer.PeekNextToken().Token.equals(",")) {
break;
} else {
lexer.GetNextToken();
}
}
if (!lexer.PeekNextToken().Token.equals(")")) {
error("Error: in class: " + className + ", \")\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
lexer.GetNextToken();
}
}
oldToken = lexer.PeekNextToken().Token;
symbolTables[4].findFunctionSymbol(className + "." + functionName);
//Insert the VM codes of subroutine into the VM file
vmCodeInput("function " + className + "." + functionName
+ " " + symbolTables[4].numOfVar + "\n");
if (constructorOrNot) {
ArrayList<String> fieldVarArray = (ArrayList<String>) classFieldVar.get(className);
vmCodeInput("push constant " + fieldVarArray.size() + "\n");
vmCodeInput("call Memory.alloc 1\n");
vmCodeInput("pop pointer 0\n");
constructorOrNot = false;
} else if (methodOrNot) {
vmCodeInput("push argument 0\n");
vmCodeInput("pop pointer 0\n");
methodOrNot = false;
}
//Reset the values of temporary variables in the symbol tables
symbolTableVarClear();
}
//This method is used to find all static belonging to current classes
private void classStaticDeclarCheck(String name) {
try {
Pattern pattern = Pattern.compile(Type);
//Declare the new lexical analyser
Lexer temLexer = new Lexer(name + ".jack");
temLexer.initLocalFile();
/*Construct a loop to supervise the value of index for terminating the loop
when end of source codes have been reached.*/
while (temLexer.getReadIndex() < temLexer.getTextContent().length() - 2) {
if (temLexer.PeekNextToken().Token.equals("static")) {
temLexer.GetNextToken();
String assignArgumentType = "";
String beAssignedArgumentType = "";
if (!pattern.matcher(temLexer.PeekNextToken().Token).matches()
&& !pattern.matcher(temLexer.PeekNextToken().Type.toString()).matches()) {
error("Error: in class: " + name + ", keyword is expected, line: " + temLexer.PeekNextToken().LineNumber);
} else {
//Store all data types can be accepted for type conversion
assignArgumentType = temLexer.PeekNextToken().Token;
if (assignArgumentType.equals("Array")) {
beAssignedArgumentType = "(int|Array|null|class|all)";
} else if (assignArgumentType.equals("String")) {
beAssignedArgumentType = "(String|null|all)";
} else if (assignArgumentType.equals("char")) {
beAssignedArgumentType = "(int|char|all)";
} else if (assignArgumentType.equals("boolean")) {
beAssignedArgumentType = "(int|boolean|all)";
} else if (assignArgumentType.equals("int")) {
beAssignedArgumentType = "(int|all)";
} else {
beAssignedArgumentType = "(" + assignArgumentType + "|null|Array)";
}
temLexer.GetNextToken();
}
//Store the information of static variables into the symbol table
while (true) {
if (!temLexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + name + ", identifier is expected, line: " + temLexer.PeekNextToken().LineNumber);
} else {
if (symbolTables[0].findIdentifierSymbol(name + "." + temLexer.PeekNextToken().Token)
&& symbolTables[1].findIdentifierSymbol(temLexer.PeekNextToken().Token)) {
error("Error: in class: " + className + ", Variable redeclaration, line: " + temLexer.PeekNextToken().LineNumber);
} else {
symbolTables[0].addIdentifierSymbolTable(name + "." + temLexer.PeekNextToken().Token, Symbol.SymbolType.Static, assignArgumentType, beAssignedArgumentType, "static");
if (assignArgumentType.equals("Array")) {
classArrayNumOfEle.put(temLexer.PeekNextToken().Token, null);
}
}
temLexer.GetNextToken();
}
if (!temLexer.PeekNextToken().Token.equals(",")) {
break;
} else {
temLexer.GetNextToken();
}
}
if (!temLexer.PeekNextToken().Token.equals(";")) {
error("Error: in class: " + name + ", \";\" is expected, line: " + temLexer.PeekNextToken().LineNumber);
}
}
temLexer.GetNextToken();
}
} catch (Exception e) {
e.printStackTrace();
}
//Clear the values of temporary variables
symbolTableVarClear();
}
/*This method is used to check the grammar of the fields in current source
codes and store the information of them into the corresponding symbol table
*/
private void classVarDeclarCheck() {
Pattern pattern = Pattern.compile(Type);
String assignArgumentType = "";
String beAssignedArgumentType = "";
if (!pattern.matcher(lexer.PeekNextToken().Token).matches()
&& !pattern.matcher(lexer.PeekNextToken().Type.toString()).matches()) {
error("Error: in class: " + className + ", keyword is expected, line: " + lexer.PeekNextToken().LineNumber);
} else {
//Store all data types can be accepted for type conversion
assignArgumentType = lexer.PeekNextToken().Token;
if (assignArgumentType.equals("Array")) {
beAssignedArgumentType = "(int|Array|all)";
} else if (assignArgumentType.equals("String")) {
beAssignedArgumentType = "(String|null|all)";
} else if (assignArgumentType.equals("char")) {
beAssignedArgumentType = "(int|char|all)";
} else if (assignArgumentType.equals("boolean")) {
beAssignedArgumentType = "(int|boolean|all)";
} else if (assignArgumentType.equals("int")) {
beAssignedArgumentType = "(int|all)";
} else {
beAssignedArgumentType = "(" + assignArgumentType + "|null|Array)";
}
lexer.GetNextToken();
}
//Store the information of field variables into the symbol table
while (true) {
if (!lexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + className + ", identifier is expected, line: " + lexer.PeekNextToken().LineNumber);
} else {
if (symbolTables[1].findIdentifierSymbol(lexer.PeekNextToken().Token)
&& symbolTables[0].findIdentifierSymbol(className + "." + lexer.PeekNextToken().Token)) {
error("Error: in class: " + className + ", variable redeclaration, line: " + lexer.PeekNextToken().LineNumber);
} else {
symbolTables[1].addIdentifierSymbolTable(lexer.PeekNextToken().Token, Symbol.SymbolType.field, assignArgumentType, beAssignedArgumentType, "this");
if (assignArgumentType.equals("Array")) {
classArrayNumOfEle.put(lexer.PeekNextToken().Token, null);
}
}
lexer.GetNextToken();
}
if (!lexer.PeekNextToken().Token.equals(",")) {
break;
} else {
lexer.GetNextToken();
}
}
if (!lexer.PeekNextToken().Token.equals(";")) {
error("Error: in class: " + className + ", \";\" is expected, line: " + lexer.PeekNextToken().LineNumber);
} else {
lexer.GetNextToken();
}
//Clear the values of temporary variables in the symbol table
symbolTableVarClear();
}
/*This method is used to check the grammar of the local variables in the subroutine
and insert the information of these variables into the symbol table
*/
private void functionVarDeclarCheck() {
Pattern pattern = Pattern.compile(Type);
String assignArgumentType = "";
String beAssignedArgumentType = "";
if (!pattern.matcher(lexer.PeekNextToken().Token).matches()) {
error("Error: in class: " + className + ", keyword is expected, line: " + lexer.PeekNextToken().LineNumber);
} else {
//Store all data types can be accepted for type conversion
assignArgumentType = lexer.PeekNextToken().Token;
if (assignArgumentType.equals("Array")) {
beAssignedArgumentType = "(int|Array|null|all)";
} else if (assignArgumentType.equals("String")) {
beAssignedArgumentType = "(String|null|all)";
} else if (assignArgumentType.equals("char")) {
beAssignedArgumentType = "(int|char|all)";
} else if (assignArgumentType.equals("boolean")) {
beAssignedArgumentType = "(int|boolean|all)";
} else if (assignArgumentType.equals("int")) {
beAssignedArgumentType = "(int|all)";
} else {
beAssignedArgumentType = "(" + assignArgumentType + "|null|Array)";
}
lexer.GetNextToken();
}
//Store the information of local variables into the symbol table
while (true) {
if (!lexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + className + ", identifier is expected, line: " + lexer.PeekNextToken().LineNumber);
} else {
if (symbolTables[3].findIdentifierSymbol(lexer.PeekNextToken().Token)
|| symbolTables[2].findIdentifierSymbol(lexer.PeekNextToken().Token)) {
error("Error: in class: " + className + ", variable redeclaration, line: " + lexer.PeekNextToken().LineNumber);
} else {
symbolTables[2].addIdentifierSymbolTable(lexer.PeekNextToken().Token, Symbol.SymbolType.var, assignArgumentType, beAssignedArgumentType, "local");
if (assignArgumentType.equals("Array")) {
functionArrayNumOfEle.put(lexer.PeekNextToken().Token, null);
}
}
lexer.GetNextToken();
}
if (!lexer.PeekNextToken().Token.equals(",")) {
break;
} else {
lexer.GetNextToken();
}
}
if (!lexer.PeekNextToken().Token.equals(";")) {
error("Error: in class: " + className + ", \";\" is expected, line: " + lexer.PeekNextToken().LineNumber);
} else {
oldToken = lexer.PeekNextToken().Token;
lexer.GetNextToken();
}
//Clear the values of the temporary variables in the symbol table
symbolTableVarClear();
}
/*This method is used to check the grammar of the let statement, store
variable has been initialized and make the data type checking for the
two sides around the equal sign.
*/
private void letStatementCheck() throws Exception {
String lastToken = "";
String varName = "";
String memorySegment = "";
String dataType = "";
int offset = 0;
boolean arrayOrNot = false;
Pattern pattern = Pattern.compile(otherClassType);
if (!lexer.PeekNextToken().Type.toString().equals("ID")) {
error("Error: in class: " + className
+ ", identifier is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
//Check if the variable is defined before using
if (!(symbolTables[2].findIdentifierSymbol(lexer.PeekNextToken().Token)
|| symbolTables[3].findIdentifierSymbol(lexer.PeekNextToken().Token)
|| symbolTables[1].findIdentifierSymbol(lexer.PeekNextToken().Token)
|| symbolTables[0].findIdentifierSymbol(className + "." + lexer.PeekNextToken().Token))) {
error("Error: in class: " + className + ", variable \""
+ lexer.PeekNextToken().Token + "\" is not declared before, line: "
+ lexer.PeekNextToken().LineNumber);
}
for (SymbolTable symbolTable : symbolTables) {
if (!symbolTable.dataType.equals("")
&& !symbolTable.memorySegment.equals("")) {
varName = symbolTable.varName;
offset = symbolTable.offset;
dataType = symbolTable.dataType;
memorySegment = symbolTable.memorySegment;
break;
}
symbolTable.memorySegment = "";
symbolTable.dataType = "";
symbolTable.offset = 0;
}
lastToken = lexer.PeekNextToken().Token;
lexer.GetNextToken();
}
//Check if the variable on the left-hand side is an array
if (lexer.PeekNextToken().Token.equals("[")) {
lexer.GetNextToken();
expression();
vmCodeInput("push " + memorySegment + " " + offset + "\n");
if (!(expressionReturnType.equals("int")
|| expressionReturnType.equals("all"))) {
error("Error: in class: " + className
+ ", \"int value\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
}
if (!lexer.PeekNextToken().Token.equals("]")) {
error("Error: in class: " + className
+ ", \"]\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
if (!dataType.equals("Array")) {
error("Error: in class: " + className
+ ", variable \"" + lastToken + "\" is not an array variable, line: "
+ lexer.PeekNextToken().LineNumber);
}
vmCodeInput("add\n");
arrayOrNot = true;
lexer.GetNextToken();
}
}
if (!lexer.PeekNextToken().Token.equals("=")) {
error("Error: in class: " + className
+ ", \"=\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
lexer.GetNextToken();
String arrayVarName = lexer.PeekNextToken().Token;
expression();
//Check if it is the initialization for array and record the number of elements defined,
if (dataType.equals("Array") && arrayInitOrNot) {
if (functionArrayNumOfEle.containsKey(varName)) {
functionArrayNumOfEle.replace(varName, eleNumberCounter);
} else {
classArrayNumOfEle.replace(varName, eleNumberCounter);
}
arrayInitOrNot = false;
}
//Insert the VM codes if the expression on the right-hand side is an array
if (arrayOrNot) {
vmCodeInput("pop temp 0\n");
vmCodeInput("pop pointer 1\n");
vmCodeInput("push temp 0\n");
vmCodeInput("pop that 0\n");
} else {
//Check if the data type of two sides match with each other
vmCodeInput("pop " + memorySegment + " " + offset + "\n");
if (Pattern.compile(symbolTables[2].
getIdentifierBeAssignedDataType(lastToken)).
matcher(expressionReturnType).matches()
|| Pattern.compile(symbolTables[3].
getIdentifierBeAssignedDataType(lastToken)).
matcher(expressionReturnType).matches()
|| Pattern.compile(symbolTables[1].
getIdentifierBeAssignedDataType(lastToken)).
matcher(expressionReturnType).matches()
|| Pattern.compile(symbolTables[0].
getIdentifierBeAssignedDataType(className + "." + lastToken)).
matcher(expressionReturnType).matches()) {
if (((pattern.matcher(symbolTables[2].
getIdentifierAssignDataType(lastToken)).matches()
|| pattern.matcher(symbolTables[3].
getIdentifierAssignDataType(lastToken)).matches()
|| pattern.matcher(symbolTables[1].
getIdentifierAssignDataType(lastToken)).matches()
|| pattern.matcher(symbolTables[0].
getIdentifierAssignDataType(className + "." + lastToken)).matches())
&& expressionReturnType.equals("Array"))) {
if (!(functionArrayNumOfEle.containsKey(arrayVarName)
&& (((ArrayList<String>) classFieldVar.get(dataType)).size()
== (int) functionArrayNumOfEle.get(arrayVarName)))) {
if (!(classArrayNumOfEle.containsKey(arrayVarName)
&& (((ArrayList<String>) classFieldVar.get(dataType)).size()
== (int) classArrayNumOfEle.get(arrayVarName)))) {
error("Error: in class: " + className
+ ", the numer of fields not matches with the number of elements in the array, line: "
+ lexer.PeekNextToken().Token);
}
}
}
} else {
error("Error: in class: " + className + ", data type of return acvalue is wrong, line "
+ lexer.PeekNextToken().LineNumber);
}
}
if (!lexer.PeekNextToken().Token.equals(";")) {
error("Error: in class: " + className + ", \";\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
//Mark if the variable on the left-hand side is initialized
if (memorySegment.equals("local")) {
symbolTables[2].setInitOrNot(lastToken);
} else if (memorySegment.equals("argument")) {
symbolTables[3].setInitOrNot(lastToken);
} else if (memorySegment.equals("this")) {
symbolTables[1].setInitOrNot(lastToken);
} else {
symbolTables[0].setInitOrNot(className + "." + lastToken);
}
oldToken = lexer.PeekNextToken().Token;
lexer.GetNextToken();
}
}
symbolTableVarClear();
}
//This method is used to check the grammar of the if statement and insert VM codes for if statement
private void ifStatementCheck() throws Exception {
boolean ifReturnOrNot = false;
boolean elseReturnOrNot = false;
if (!lexer.PeekNextToken().Token.equals("(")) {
error("Error: in class: " + className + ", \"(\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
lexer.GetNextToken();
}
expression();
if (!lexer.PeekNextToken().Token.equals(")")) {
error("Error: in class: " + className + ", \")\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
lexer.GetNextToken();
}
int currentIfCounter = ifCounter;
vmCodeInput("if-goto IF_TRUE" + currentIfCounter + "\n");
vmCodeInput("goto IF_FALSE" + currentIfCounter + "\n");
if (!lexer.PeekNextToken().Token.equals("{")) {
error("Error: in class: " + className + ", \"{\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
vmCodeInput("label IF_TRUE" + currentIfCounter + "\n");
lexer.GetNextToken();
ifCounter++;
}
//Check the grammar of the source codes in the braces behind the if keyword
Token newToken = lexer.PeekNextToken();
try {
while (lexer.getReadIndex() < textContent.length() - 2) {
if (newToken.Token.equals("let")) {
lexer.GetNextToken();
letStatementCheck();
} else if (newToken.Token.equals("if")) {
lexer.GetNextToken();
ifStatementCheck();
} else if (newToken.Token.equals("while")) {
lexer.GetNextToken();
whileStatementCheck();
} else if (newToken.Token.equals("do")) {
lexer.GetNextToken();
doStatementCheck();
} else if (newToken.Token.equals("return")) {
ifReturnOrNot = true;
lexer.GetNextToken();
returnStatementCheck();
}
newToken = lexer.PeekNextToken();
if (newToken.Token.equals("}")) {
break;
}
}
} catch (Exception e) {
e.printStackTrace();
}
if (!lexer.PeekNextToken().Token.equals("}")) {
error("Error: in class: " + className + ", \"}\" is expected, line: "
+ lexer.PeekNextToken().LineNumber);
} else {
oldToken = lexer.PeekNextToken().Token;
lexer.GetNextToken();
}
//Check the grammar of the source codes in the braces behind the else keyword
if (lexer.PeekNextToken().Token.equals("else")) {
vmCodeInput("goto IF_END" + currentIfCounter + "\n");