Restructure project to make room for clox

1 files changed, 0 insertions, 392 deletions

diff --git a/src/com/craftinginterpreters/lox/Interpreter.java b/src/com/craftinginterpreters/lox/Interpreter.java
deleted file mode 100644
index 3f4d385..0000000
--- a/src/com/craftinginterpreters/lox/Interpreter.java
+++ /dev/null
@@ -1,392 +0,0 @@
-package com.craftinginterpreters.lox;
-
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-class Interpreter implements Expr.Visitor<Object>, Stmt.Visitor<Void> {
-    final Environment globals = new Environment();
-    private Environment environment = globals;
-    private final Map<Expr, Integer> locals = new HashMap<>();
-
-    Interpreter() {
-        globals.define("clock", new LoxCallable() {
-            @Override
-            public int arity() {
-                return 0;
-            }
-
-            @Override
-            public Object call(Interpreter interpreter, List<Object> arguments) {
-                return (double) System.currentTimeMillis() / 1000.0;
-            }
-
-            @Override
-            public String toString() {
-                return "<native fn>";
-            }
-        });
-    }
-
-    @Override
-    public Object visitLiteralExpr(Expr.Literal expr) {
-        return expr.value;
-    }
-
-    @Override
-    public Object visitLogicalExpr(Expr.Logical expr) {
-        Object left = evaluate(expr.left);
-
-        if (expr.operator.type == TokenType.OR) {
-            if (isTruthy(left))
-                return left;
-        } else {
-            if (!isTruthy(left))
-                return left;
-        }
-
-        return evaluate(expr.right);
-    }
-
-    @Override
-    public Object visitSetExpr(Expr.Set expr) {
-        Object object = evaluate(expr.object);
-
-        if (!(object instanceof LoxInstance)) {
-            throw new RuntimeError(expr.name, "Only instances have fields.");
-        }
-
-        Object value = evaluate(expr.value);
-        ((LoxInstance) object).set(expr.name, value);
-        return value;
-    }
-
-    @Override
-    public Object visitSuperExpr(Expr.Super expr) {
-        int distance = locals.get(expr);
-        LoxClass superclass = (LoxClass) environment.getAt(distance, "super");
-
-        LoxInstance object = (LoxInstance) environment.getAt(distance - 1, "this");
-
-        LoxFunction method = superclass.findMethod(expr.method.lexeme);
-
-        if (method == null) {
-            throw new RuntimeError(expr.method, "Undefined property '" + expr.method.lexeme + "'.");
-        }
-
-        return method.bind(object);
-    }
-
-    @Override
-    public Object visitThisExpr(Expr.This expr) {
-        return lookUpVariable(expr.keyword, expr);
-    }
-
-    @Override
-    public Object visitUnaryExpr(Expr.Unary expr) {
-        Object right = evaluate(expr.right);
-
-        switch (expr.operator.type) {
-        case BANG:
-            return !isTruthy(right);
-        case MINUS:
-            checkNumberOperand(expr.operator, right);
-            return -(double) right;
-        }
-
-        // Unreachable.
-        return null;
-    }
-
-    @Override
-    public Object visitVariableExpr(Expr.Variable expr) {
-        return lookUpVariable(expr.name, expr);
-    }
-
-    private Object lookUpVariable(Token name, Expr expr) {
-        Integer distance = locals.get(expr);
-        if (distance != null) {
-            return environment.getAt(distance, name.lexeme);
-        } else {
-            return globals.get(name);
-        }
-    }
-
-    private void checkNumberOperand(Token operator, Object operand) {
-        if (operand instanceof Double)
-            return;
-        throw new RuntimeError(operator, "Operand must be a number.");
-    }
-
-    private void checkNumberOperands(Token operator, Object left, Object right) {
-        if (left instanceof Double && right instanceof Double)
-            return;
-
-        throw new RuntimeError(operator, "Operands must be numbers.");
-    }
-
-    private boolean isTruthy(Object object) {
-        if (object == null)
-            return false;
-        if (object instanceof Boolean)
-            return (boolean) object;
-        return true;
-    }
-
-    private boolean isEqual(Object a, Object b) {
-        if (a == null && b == null)
-            return true;
-        if (a == null)
-            return false;
-
-        return a.equals(b);
-    }
-
-    private String stringify(Object object) {
-        if (object == null)
-            return "nil";
-
-        if (object instanceof Double) {
-            String text = object.toString();
-            if (text.endsWith(".0")) {
-                text = text.substring(0, text.length() - 2);
-            }
-            return text;
-        }
-
-        return object.toString();
-    }
-
-    @Override
-    public Object visitGroupingExpr(Expr.Grouping expr) {
-        return evaluate(expr.expression);
-    }
-
-    private Object evaluate(Expr expr) {
-        return expr.accept(this);
-    }
-
-    private void execute(Stmt stmt) {
-        stmt.accept(this);
-    }
-
-    public void resolve(Expr expr, int depth) {
-        locals.put(expr, depth);
-    }
-
-    public void executeBlock(List<Stmt> statements, Environment environment) {
-        Environment previous = this.environment;
-
-        try {
-            this.environment = environment;
-
-            for (Stmt statement : statements) {
-                execute(statement);
-            }
-        } finally {
-            this.environment = previous;
-        }
-    }
-
-    @Override
-    public Void visitBlockStmt(Stmt.Block stmt) {
-        executeBlock(stmt.statements, new Environment(environment));
-        return null;
-    }
-
-    @Override
-    public Void visitClassStmt(Stmt.Class stmt) {
-        Object superclass = null;
-        if (stmt.superclass != null) {
-            superclass = evaluate(stmt.superclass);
-            if (!(superclass instanceof LoxClass)) {
-                throw new RuntimeError(stmt.superclass.name, "Superclass must be a class.");
-            }
-        }
-        environment.define(stmt.name.lexeme, null);
-
-        if (stmt.superclass != null) {
-            environment = new Environment(environment);
-            environment.define("super", superclass);
-        }
-
-        Map<String, LoxFunction> methods = new HashMap<>();
-        for (Stmt.Function method : stmt.methods) {
-            LoxFunction function = new LoxFunction(method, environment, method.name.lexeme.equals("init"));
-            methods.put(method.name.lexeme, function);
-        }
-
-        LoxClass klass = new LoxClass(stmt.name.lexeme, (LoxClass) superclass, methods);
-
-        if (superclass != null) {
-            environment = environment.enclosing;
-        }
-
-        environment.assign(stmt.name, klass);
-        return null;
-    }
-
-    @Override
-    public Void visitExpressionStmt(Stmt.Expression stmt) {
-        evaluate(stmt.expression);
-        return null;
-    }
-
-    @Override
-    public Void visitFunctionStmt(Stmt.Function stmt) {
-        LoxFunction function = new LoxFunction(stmt, environment, false);
-        environment.define(stmt.name.lexeme, function);
-        return null;
-    }
-
-    @Override
-    public Void visitIfStmt(Stmt.If stmt) {
-        if (isTruthy(evaluate(stmt.condition))) {
-            execute(stmt.thenBranch);
-        } else if (stmt.elseBranch != null) {
-            execute(stmt.elseBranch);
-        }
-
-        return null;
-    }
-
-    @Override
-    public Void visitPrintStmt(Stmt.Print stmt) {
-        Object value = evaluate(stmt.expression);
-        System.out.println(stringify(value));
-        return null;
-    }
-
-    @Override
-    public Void visitReturnStmt(Stmt.Return stmt) {
-        Object value = null;
-        if (stmt.value != null)
-            value = evaluate(stmt.value);
-
-        throw new Return(value);
-    }
-
-    @Override
-    public Void visitVarStmt(Stmt.Var stmt) {
-        Object value = null;
-        if (stmt.initializer != null) {
-            value = evaluate(stmt.initializer);
-        }
-
-        environment.define(stmt.name.lexeme, value);
-        return null;
-    }
-
-    @Override
-    public Void visitWhileStmt(Stmt.While stmt) {
-        while (isTruthy(evaluate(stmt.condition))) {
-            execute(stmt.body);
-        }
-
-        return null;
-    }
-
-    @Override
-    public Object visitAssignExpr(Expr.Assign expr) {
-        Object value = evaluate(expr.value);
-
-        Integer distance = locals.get(expr);
-        if (distance != null) {
-            environment.assignAt(distance, expr.name, value);
-        } else {
-            globals.assign(expr.name, value);
-        }
-
-        return value;
-    }
-
-    @Override
-    public Object visitBinaryExpr(Expr.Binary expr) {
-        Object left = evaluate(expr.left);
-        Object right = evaluate(expr.right);
-
-        switch (expr.operator.type) {
-        case GREATER:
-            checkNumberOperands(expr.operator, left, right);
-            return (double) left > (double) right;
-        case GREATER_EQUAL:
-            checkNumberOperands(expr.operator, left, right);
-            return (double) left >= (double) right;
-        case LESS:
-            checkNumberOperands(expr.operator, left, right);
-            return (double) left < (double) right;
-        case LESS_EQUAL:
-            checkNumberOperands(expr.operator, left, right);
-            return (double) left <= (double) right;
-        case BANG_EQUAL:
-            return !isEqual(left, right);
-        case EQUAL_EQUAL:
-            return isEqual(left, right);
-        case MINUS:
-            checkNumberOperands(expr.operator, left, right);
-            return (double) left - (double) right;
-        case PLUS:
-            if (left instanceof Double && right instanceof Double) {
-                return (double) left + (double) right;
-            }
-
-            if (left instanceof String && right instanceof String) {
-                return (String) left + (String) right;
-            }
-
-            throw new RuntimeError(expr.operator, "Operands must be two numbers or two strings.");
-        case SLASH:
-            checkNumberOperands(expr.operator, left, right);
-            return (double) left / (double) right;
-        case STAR:
-            checkNumberOperands(expr.operator, left, right);
-            return (double) left * (double) right;
-        }
-
-        // Unreachable.
-        return null;
-    }
-
-    @Override
-    public Object visitCallExpr(Expr.Call expr) {
-        Object callee = evaluate(expr.callee);
-
-        List<Object> arguments = new ArrayList<>();
-        for (Expr argument : expr.arguments) {
-            arguments.add(evaluate(argument));
-        }
-
-        if (!(callee instanceof LoxCallable)) {
-            throw new RuntimeError(expr.paren, "Can only call functions and classes.");
-        }
-
-        LoxCallable function = (LoxCallable) callee;
-        if (arguments.size() != function.arity()) {
-            throw new RuntimeError(expr.paren,
-                    "Expected " + function.arity() + " arguments but got " + arguments.size() + ".");
-        }
-
-        return function.call(this, arguments);
-    }
-
-    @Override
-    public Object visitGetExpr(Expr.Get expr) {
-        Object object = evaluate(expr.object);
-        if (object instanceof LoxInstance) {
-            return ((LoxInstance) object).get(expr.name);
-        }
-
-        throw new RuntimeError(expr.name, "Only instances have properties.");
-    }
-
-    public void interpret(List<Stmt> statements) {
-        try {
-            for (Stmt statement : statements) {
-                execute(statement);
-            }
-        } catch (RuntimeError error) {
-            Lox.runtimeError(error);
-        }
-    }
-}