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Implement expression computation by AST in StringCalc

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ChronosX88 2021-06-08 18:08:05 +03:00
parent 244099760e
commit d282ea8b8c
Signed by: ChronosXYZ
GPG Key ID: 085A69A82C8C511A
15 changed files with 243 additions and 476 deletions
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1
StringCalc/.gitignore vendored Normal file
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out/

22
StringCalc/.idea/compiler.xml
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3
StringCalc/.idea/copyright/profiles_settings.xml
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1
StringCalc/.idea/description.html
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<html>Simple <b>Java</b> application that includes a class with <code>main()</code> method</html>

8
StringCalc/.idea/misc.xml
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2
StringCalc/.idea/modules.xml
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@ -2,7 +2,7 @@
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3
StringCalc/.idea/project-template.xml
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@ -1,3 +0,0 @@
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6
StringCalc/.idea/vcs.xml Normal file
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StringCalc/.idea/workspace.xml
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1
StringCalc/UnnamedCalc.iml → StringCalc/StringCalc.iml
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@ -9,4 +9,3 @@
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StringCalc/out/production/UnnamedCalc/main/Main.class
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25
StringCalc/src/main/ASTNode.java Normal file
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@ -0,0 +1,25 @@
package main;
class ASTNode {
ASTNode left;
ASTNode right;
Token token;
public ASTNode(Token token, ASTNode left, ASTNode right) {
this.left = left;
this.right = right;
this.token = token;
}
public ASTNode(Token token) {
this(token, null, null);
}
@Override
public String toString() {
if (right == null && left == null) {
return String.format("ASTNode{token=%s}", token);
}
return String.format("ASTNode{token=%s,left=%s,right=%s}", token, left, right);
}
}

187
StringCalc/src/main/Main.java
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@ -1,88 +1,153 @@
package main;
import java.util.Scanner;
import java.util.Stack;
import java.util.stream.IntStream;
import java.util.*;
import java.util.stream.Collectors;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String line;
Stack<String> operators = new Stack<>();
Stack<Float> numbers = new Stack<>();
line = scanner.nextLine();
char[] lineArray = new char[line.length()];
line = line.replace(" ", "");
line = line.replace("+-", "-");
line = line.replace("--", "+");
char[] lineArray;
lineArray = line.toCharArray();
System.out.println(calcExpression(lineArray, operators, numbers));
List<Token> tokens = tokenize(lineArray);
System.out.println("[\n"+tokens.stream()
.map(item -> "\t"+item)
.collect(Collectors.joining(",\n"))+"\n]");
ASTNode node = parse(tokens);
System.out.println(node.toString());
int result = evaluateAST(node);
System.out.println(result);
}
static float calcExpression(char[] charArr, Stack<String> operators, Stack<Float> numbers) {
for(int i = 0; i < charArr.length; i++) {
static List<Token> tokenize(char[] charArr) {
List<Token> tokens = new ArrayList<>();
StringBuilder tmpNumStr = new StringBuilder();
boolean isLastCharOperator = false;
for (int i = 0; i < charArr.length; i++) {
char c = charArr[i];
Token token = new Token(TokenType.Unknown, null);
if (Character.isDigit(c) || c == '-' && isLastCharOperator) {
isLastCharOperator = false;
tmpNumStr.append(c);
// if next char is also digit, then, instead of creating token, parse next digit
// if it's the end of array, then just create token and finish
if (i+1 != charArr.length) {
if(Character.isDigit(charArr[i+1])) {
continue;
}
}
token = new Token(TokenType.Number, Integer.parseInt(tmpNumStr.toString()));
tmpNumStr = new StringBuilder();
} else {
switch (c) {
case '(': {
token = new Token(TokenType.Operator, OperatorType.LeftParenthesis);
break;
}
case '+': {
token = new Token(TokenType.Operator, OperatorType.Add);
break;
}
case '-': {
token = new Token(TokenType.Operator, OperatorType.Sub);
break;
}
case '*': {
token = new Token(TokenType.Operator, OperatorType.Mul);
break;
}
case '/': {
token = new Token(TokenType.Operator, OperatorType.Div);
break;
}
case ')': {
token = new Token(TokenType.Operator, OperatorType.RightParenthesis);
break;
}
}
isLastCharOperator = true;
}
tokens.add(token);
}
String operatorTemp;
float numberTemp;
return tokens;
}
if (charArr == null)
throw new IllegalArgumentException("Num не должен быть null");
static ASTNode parse(List<Token> tokens) {
Stack<ASTNode> output = new Stack<>();
Stack<Token> ops = new Stack<>();
for (Token token : tokens) {
// https://en.wikipedia.org/wiki/Shunting-yard_algorithm
switch(charArr[i]) {
case '(': {
break;
}
case '+': {
operators.push("+");
break;
}
case '-': {
operators.push("-");
break;
}
case '*': {
operators.push("*");
break;
}
case '/': {
operators.push("/");
break;
}
case ')': {
operatorTemp = operators.pop();
numberTemp = numbers.pop();
if (token.type == TokenType.Number) {
output.add(new ASTNode(token));
continue;
}
switch(operatorTemp) {
case "+": {
numberTemp = numbers.pop() + numberTemp;
break;
}
case "-": {
numberTemp = numbers.pop() - numberTemp;
break;
}
case "*": {
numberTemp = numbers.pop() * numberTemp;
break;
}
case "/": {
numberTemp = numbers.pop() / numberTemp;
if (token.type == TokenType.Operator) {
if (token.value == OperatorType.LeftParenthesis) {
ops.push(token);
continue;
}
while (ops.size() != 0) {
if (ops.peek().value == OperatorType.LeftParenthesis) {
break;
}
if (token.value != OperatorType.RightParenthesis) {
if (OperatorType.getPrecedence((OperatorType) ops.peek().value) < OperatorType.getPrecedence((OperatorType) token.value)) {
break;
}
}
numbers.push(numberTemp);
break;
Token op = ops.pop();
ASTNode right = output.pop();
ASTNode left = output.pop();
output.push(new ASTNode(op, left, right));
}
default: {
numbers.push(Float.parseFloat(String.valueOf(charArr[i])));
if (token.value == OperatorType.RightParenthesis) {
ops.pop();
} else {
ops.push(token);
}
}
}
return numbers.pop();
while(ops.size() != 0) {
Token op = ops.pop();
ASTNode right = output.pop();
ASTNode left = output.pop();
output.push(new ASTNode(op, left, right));
}
return output.pop();
}
static int evaluateAST(ASTNode node) {
int val = 0;
if (node.token.type == TokenType.Operator) {
switch ((OperatorType) node.token.value) {
case Add:
val = evaluateAST(node.left) + evaluateAST(node.right);
break;
case Sub:
val = evaluateAST(node.left) - evaluateAST(node.right);
break;
case Mul:
val = evaluateAST(node.left) * evaluateAST(node.right);
break;
case Div:
val = evaluateAST(node.left) / evaluateAST(node.right);
break;
}
} else {
val = (int) node.token.value;
}
return val;
}
}

23
StringCalc/src/main/OperatorType.java Normal file
View File

@ -0,0 +1,23 @@
package main;
public enum OperatorType {
Add,
Sub,
Mul,
Div,
LeftParenthesis,
RightParenthesis;
public static int getPrecedence(OperatorType type) {
switch (type) {
case Add:
case Sub:
return 0;
case Mul:
case Div:
return 1;
default:
return -1;
}
}
}

22
StringCalc/src/main/Token.java Normal file
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@ -0,0 +1,22 @@
package main;
enum TokenType {
Number,
Operator,
Unknown
}
class Token {
TokenType type;
Object value;
public Token(TokenType type, Object value) {
this.type = type;
this.value = value;
}
@Override
public String toString() {
return "Token{type="+type+", value="+value+"}";
}
}