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Parser.java
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475 lines (413 loc) · 9.87 KB
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package translator;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
public class Parser {
private List<Token> tokens;
private Iterator<Token> iterator;
private Token token;
private Map<String, Type> map = new HashMap<String, Type>();
private List<String> codelist = new ArrayList<>();
private List<String> functionlist = new ArrayList<>();
private StringBuffer code;
private boolean incdec = false;
private String name;
private int opened2 = 0;
private boolean isFunc;
private int newVar = -1;
private Type type;
/**
* ïåðå÷èñëåíèå äëÿ òèïîâ ïåðåìåííûõ
*/
enum Type{
INT(0, "int "),
STRING(2, "String "),
FLOAT(1, "float ");
public final String value;
public final int priority;
private Type(int p, String s) {
value = s;
priority = p;
}
}
/**
* ãëàâíûå ìåòîä äëÿ ðàçáîðà ñòðîêè
* @param tokens
* @throws ParseException
*/
public void expr(List<Token> tokens) throws ParseException {
this.tokens = tokens;
this.iterator = this.tokens.iterator();
code = new StringBuffer(); // ñãåíåðèð. äæàâà-êîä
// ðàçáîð ïåðâîãî òîêåíà
nextlexem();
switch (token.name) {
case ECHO:
case PRINT:
code.append("System.out.println(");
print_expr();
code.append(")");
semicolon();
break;
case VAR:
varExpression();
semicolon();
break;
case WHILE:
code.append("while ");
unequationExpression(); // íåðàâåíñòâî â ñêîáêàõ
nextlexem();
open2(); // îòêðûâàþùàÿ {
break;
case FOR:
code.append("for ");
forExpression();
nextlexem();
open2();// îòêðûâàþùàÿ {
break;
case IF:
code.append("if ");
unequationExpression();// íåðàâåíñòâî â ñêîáêàõ
nextlexem();
open2();// îòêðûâàþùàÿ {
break;
case ELSE:
code.append("else ");
nextlexem();
if (token.name == TokenType.IF){
code.append("if ");
unequationExpression();
nextlexem();
}
open2();// îòêðûâàþùàÿ {
break;
case FUNAME:
code.append(token.value);
open();
nextlexem();
numvar();
close();
nextlexem();
semicolon();
break;
case FUNCTION:
isFunc = true;
code = new StringBuffer();
code.append("private static void ");
nextlexem();
if (token.name == TokenType.FUNAME){
code.append(token.value);
open();
nextlexem();
code.append("int ");
var();
while(isComma()){
//TODO îáðàáîòêà ïàðàìåòðîâ ôóíêöèè
}
close();
nextlexem();
open2();
}
break;
case CLOSE2:
code.append("\t}");
opened2--;
break;
default:
break;
}
if (isFunc){
functionlist.add(code.toString());
if (opened2 == 0)
isFunc = false;
}else
codelist.add(code.toString());
}
private boolean isComma() {
if (token.name == TokenType.COMMA)
return true;
return false;
}
// (int i=0; i<n; i++)
private void forExpression() throws ParseException {
open();
nextlexem();
var();
assignExpression();
semicolon();
unequation();
semicolon();
nextlexem();
varExpression();
close();
}
private void unequationExpression() throws ParseException {
open();
unequation();
close();
}
private void print_expr() throws ParseException {
nextlexem();
String val = token.value;
switch (token.name) {
case VAR:
val = val.substring(1);
case INT:
case TEXT:
code.append(val);
nextlexem();
while(token.name == TokenType.DOT){
code.append(" + ");
print_expr();
}
break;
default:
throw new ParseException("Can't print " + token);
}
}
//ëèáî a++, ëèáî a = blabla;
private void varExpression() throws ParseException {
var();
if (!incdec) {
assignExpression();
}
incdec = false;
}
// = bla-bla;
// åñëè â íà÷àëå áûëà íîâàÿ ïåðåìåííàÿ (newVar > -1) òî íàäî âñòàâèòü â êîä òèï ïåðåìåííîé
//ÄÎ åå îáúÿâëåíèÿ (äëÿ ýòîãî ìû çàïîìíèëè newVar = èíäåêñ ïåðâîé áóêâû ïåðåìåííîé)
private void assignExpression() throws ParseException {
assign();
expr_body();
if (newVar>-1){
code.insert(newVar, type.value);
map.put(name, type);
newVar = -1;
}
}
//ôèãóðíàÿ îòêðûâàþùàÿ ñêîáêà {
private void open2() throws ParseException {
if(token.name == TokenType.OPEN2){
code.append(token.value);
opened2++;
}else{
throw new ParseException(" { expected: " + token);
}
}
private void close() throws ParseException {
if(token.name!= TokenType.CLOSE){
throw new ParseException("\")\" expected: " + token);
}
code.append(token.value);
}
private void semicolon() throws ParseException {
if (token.name != TokenType.SEMICOLON)
throw new ParseException("\";\" expected" + token);
code.append(";");
}
//íåðàâåíñòâî
private void unequation() throws ParseException {
nextlexem();
var();
assign();
expr_body();
}
private void open() throws ParseException {
nextlexem();
if (token.name != TokenType.OPEN){
throw new ParseException("\"(\" expected: " + token);
}
code.append(token.value);
}
private void nextlexem() {
if (iterator.hasNext()) {
token = iterator.next();
while (token.name == TokenType.WHITESPACE)
nextlexem();
} else
token = null;
}
//âûðàæåíèå ñ îïåðàöèÿìè + - * / % ( )
private void expr_body() throws ParseException {
item();
while (isOperatorPlus()) {
code.append(token.value);
item();
}
}
//îáðàáàòûâàåò âûðàæåíèå-ñëàãàåìîå
private void item() throws ParseException {
nextlexem();
mult();
while (isOperatorMult()) {
code.append(token.value);
item();
}
}
/**
* îáðàáàòûâàåò ìíîæèòåëü
* @throws ParseException
*/
private void mult() throws ParseException {
if (token == null)
throw new ParseException("unexpected end of a string");
switch (token.name) {
case TEXT:
if (newVar>-1) type = Type.STRING;
code.append(token.value);
nextlexem();
break;
case INT:
case FLOAT:
case VAR:
numvar();
break;
case OPEN:
code.append(token.value);
expr_body();
if (token.name == TokenType.CLOSE) {
code.append(token.value);
nextlexem();
} else
throw new ParseException("closing bracket expected: " + token);
break;
case OPP:
if (token.value.equals("-")){ //ÎÒÐÈÖ ×ÈÑËÀ
code.append("-");
nextlexem();
mult();
} else
throw new ParseException("unexpected token: " + token);
break;
default:
throw new ParseException("unexpected token: " + token);
}
}
/**
* ïðîâåðÿåò, ÷òî òåêóùèé òîêåí *, / èëè %
* @return
* @throws ParseException
*/
private boolean isOperatorMult() throws ParseException {
if (token != null) {
if (token.name == TokenType.OPM) {
return true;
}
}
return false;
}
/**
* ïðîâåðÿåò, ÷òî òåêóùèé òîêåí + èëè -
* @return
* @throws ParseException
*/
private boolean isOperatorPlus() throws ParseException {
if (token != null) {
if (token.name == TokenType.OPP) {
return true;
} else if (token.name == TokenType.SEMICOLON) {
return false;
} else if (token.name == TokenType.DOT){
return true;
}
}
return false;
}
// int float variable
private void numvar() throws ParseException {
if (token == null)
throw new ParseException("no token when should be int or var ");
switch (token.name) {
case VAR:
if (!map.containsKey(token.value))
throw new ParseException("No such variable in the map: " + token.value);
if (newVar>-1) {
if (type.priority < map.get(token.value).priority)
type = map.get(token.value);
}
code.append(token.value.substring(1));
nextlexem();
if ((token.name == TokenType.INC)||(token.name == TokenType.DEC)) {
code.append(token.value);
nextlexem();
}
break;
case INT:
case FLOAT:
number();
break;
default:
throw new ParseException("token is not a variable or an number: " + token);
}
}
// int float
private void number() {
if (token.name == TokenType.INT) {
if (newVar>-1) {
if (type.priority < Type.INT.priority)
type = Type.INT;
}
}else if (token.name == TokenType.FLOAT) {
if (newVar>-1) {
if (type.priority < Type.FLOAT.priority)
type = Type.FLOAT;
}
}
code.append(token.value);
nextlexem();
}
private void var() throws ParseException {
if (token == null)
throw new ParseException("no lexem");
if (token.name == TokenType.VAR) {
name = token.value;
if (!map.containsKey(name)) {
newVar = code.length(); //çàïîìèíàåò èíäåêñ, êóäà âñòàâëÿåì òèï
type = Type.INT;
}
code.append(name.substring(1));
nextlexem();
if (token.name == TokenType.INC || token.name == TokenType.DEC ) {
code.append(token.value);
nextlexem();
incdec= true;
}
} else {
throw new ParseException("not a variable: " + token);
}
}
// =, <, >
private void assign() throws ParseException {
if (token == null)
throw new ParseException("no assign lexem");
if (token.name == TokenType.ASSIGN) {
code.append(" = ");
return;
} else if (token.name == TokenType.UNEQUAL){
code.append(token.value);
return;
} else if (token.name == TokenType.EQUAL){
code.append(token.value);
return;
}
throw new ParseException("expected assign lexem:" + token);
}
public void printAllVariables() {
for (Entry<String, Type> e : map.entrySet()) {
System.out.println(e.getKey() + " = " + e.getValue());
}
System.out.println();
}
public Map<String, Type> getVarMap() {
return map;
}
public List<String> getCodelist() {
return codelist;
}
public List<String> getFunctionlist() {
return functionlist;
}
}