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[tlox] Initial Expression parsing and evaluation

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ctsk
2022-09-13 17:31:30 +02:00
parent 1971ccef45
commit 3c12f50b6f
16 changed files with 355 additions and 4 deletions
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38
jlox/tlox/src/main/java/xyz/ctsk/lox/Main.java Normal file
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package xyz.ctsk.lox;
import com.oracle.truffle.api.Truffle;
import xyz.ctsk.lox.nodes.LoxRootNode;
import xyz.ctsk.lox.parser.LoxParser;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main {
public static void repl() throws IOException {
var input = new InputStreamReader(System.in);
var reader = new BufferedReader(input);
while (true) {
System.out.print(" >> ");
var line = reader.readLine();
if (line == null) break;
run(line);
}
}
public static void run(String program) {
var parsed = LoxParser.parseLox(program);
if (parsed instanceof LoxParser.ExpressionContext expr) {
var root = new LoxRootNode(expr.result);
var callTarget = root.getCallTarget();
System.out.println(callTarget.call());
}
}
public static void main(String[] args) throws IOException {
repl();
}
}

7
jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/LoxExpressionNode.java Normal file
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package xyz.ctsk.lox.nodes;
import com.oracle.truffle.api.frame.VirtualFrame;
public abstract class LoxExpressionNode extends LoxNode {
public abstract double executeDouble(VirtualFrame frame);
}

6
jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/LoxNode.java Normal file
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package xyz.ctsk.lox.nodes;
import com.oracle.truffle.api.nodes.Node;
public class LoxNode extends Node {
}

20
jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/LoxRootNode.java Normal file
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package xyz.ctsk.lox.nodes;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.RootNode;
public class LoxRootNode extends RootNode {
@SuppressWarnings("FieldMayBeFinal")
@Child
private LoxExpressionNode exprNode;
public LoxRootNode(LoxExpressionNode exprNode) {
super(null);
this.exprNode = exprNode;
}
@Override
public Object execute(VirtualFrame frame) {
return this.exprNode.executeDouble(frame);
}
}

24
jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxAddNode.java Normal file
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package xyz.ctsk.lox.nodes.expr;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.Node;
import xyz.ctsk.lox.nodes.LoxExpressionNode;
public class LoxAddNode extends LoxExpressionNode {
@SuppressWarnings("FieldMayBeFinal")
@Node.Child
private LoxExpressionNode leftNode, rightNode;
public LoxAddNode(LoxExpressionNode leftNode, LoxExpressionNode rightNode) {
this.leftNode = leftNode;
this.rightNode = rightNode;
}
@Override
public double executeDouble(VirtualFrame frame) {
var leftValue = leftNode.executeDouble(frame);
var rightValue = rightNode.executeDouble(frame);
return leftValue + rightValue;
}
}

22
jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxDivNode.java Normal file
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package xyz.ctsk.lox.nodes.expr;
import com.oracle.truffle.api.frame.VirtualFrame;
import xyz.ctsk.lox.nodes.LoxExpressionNode;
public class LoxDivNode extends LoxExpressionNode {
@SuppressWarnings("FieldMayBeFinal")
@Child
private LoxExpressionNode leftNode, rightNode;
public LoxDivNode(LoxExpressionNode leftNode, LoxExpressionNode rightNode) {
this.leftNode = leftNode;
this.rightNode = rightNode;
}
@Override
public double executeDouble(VirtualFrame frame) {
var leftValue = leftNode.executeDouble(frame);
var rightValue = rightNode.executeDouble(frame);
return leftValue / rightValue;
}
}

22
jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxMulNode.java Normal file
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package xyz.ctsk.lox.nodes.expr;
import com.oracle.truffle.api.frame.VirtualFrame;
import xyz.ctsk.lox.nodes.LoxExpressionNode;
public class LoxMulNode extends LoxExpressionNode {
@SuppressWarnings("FieldMayBeFinal")
@Child
private LoxExpressionNode leftNode, rightNode;
public LoxMulNode(LoxExpressionNode leftNode, LoxExpressionNode rightNode) {
this.leftNode = leftNode;
this.rightNode = rightNode;
}
@Override
public double executeDouble(VirtualFrame frame) {
var leftValue = leftNode.executeDouble(frame);
var rightValue = rightNode.executeDouble(frame);
return leftValue * rightValue;
}
}

16
jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxNumberLiteralNode.java Normal file
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package xyz.ctsk.lox.nodes.expr;
import com.oracle.truffle.api.frame.VirtualFrame;
import xyz.ctsk.lox.nodes.LoxExpressionNode;
public class LoxNumberLiteralNode extends LoxExpressionNode {
private final double value;
public LoxNumberLiteralNode(double value) {
this.value = value;
}
public double executeDouble(VirtualFrame frame) {
return this.value;
}
}

22
jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxSubNode.java Normal file
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package xyz.ctsk.lox.nodes.expr;
import com.oracle.truffle.api.frame.VirtualFrame;
import xyz.ctsk.lox.nodes.LoxExpressionNode;
public class LoxSubNode extends LoxExpressionNode {
@SuppressWarnings("FieldMayBeFinal")
@Child
private LoxExpressionNode leftNode, rightNode;
public LoxSubNode(LoxExpressionNode leftNode, LoxExpressionNode rightNode) {
this.leftNode = leftNode;
this.rightNode = rightNode;
}
@Override
public double executeDouble(VirtualFrame frame) {
var leftValue = leftNode.executeDouble(frame);
var rightValue = rightNode.executeDouble(frame);
return leftValue - rightValue;
}
}

22
jlox/tlox/src/main/java/xyz/ctsk/lox/parser/LoxNodeFactory.java Normal file
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package xyz.ctsk.lox.parser;
import org.antlr.v4.runtime.Token;
import xyz.ctsk.lox.nodes.LoxExpressionNode;
import xyz.ctsk.lox.nodes.expr.*;
public class LoxNodeFactory {
public static LoxNumberLiteralNode createNumberLiteral(Token literalToken) {
var value = Double.parseDouble(literalToken.getText());
return new LoxNumberLiteralNode(value);
}
public static LoxExpressionNode createBinaryNode(Token op, LoxExpressionNode left, LoxExpressionNode right) {
return switch (op.getText()) {
case "+" -> new LoxAddNode(left, right);
case "-" -> new LoxSubNode(left, right);
case "*" -> new LoxMulNode(left, right);
case "/" -> new LoxDivNode(left, right);
default -> null;
};
}
}