java-projects/Own-Programming-Language-Tutorial
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Переопределение операторов

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Victor 2016-02-18 13:20:26 +02:00
parent 1cc4dc8f77
commit 6c093e50b5
2 changed files with 18 additions and 2 deletions
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4
program.own
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@ -235,3 +235,7 @@ println xarr[0]
`extended word variable` = 9 `extended word variable` = 9
println `extended word variable` println `extended word variable`
// Operator overloading
def `::`(v1, v2) = string(v1) + string(v2)
println 1 :: 2 :: 3

14
src/com/annimon/ownlang/parser/ast/BinaryExpression.java
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@ -3,6 +3,7 @@ package com.annimon.ownlang.parser.ast;
import com.annimon.ownlang.exceptions.OperationIsNotSupportedException; import com.annimon.ownlang.exceptions.OperationIsNotSupportedException;
import com.annimon.ownlang.exceptions.TypeException; import com.annimon.ownlang.exceptions.TypeException;
import com.annimon.ownlang.lib.ArrayValue; import com.annimon.ownlang.lib.ArrayValue;
import com.annimon.ownlang.lib.Functions;
import com.annimon.ownlang.lib.NumberValue; import com.annimon.ownlang.lib.NumberValue;
import com.annimon.ownlang.lib.StringValue; import com.annimon.ownlang.lib.StringValue;
import com.annimon.ownlang.lib.Types; import com.annimon.ownlang.lib.Types;
@ -54,6 +55,17 @@ public final class BinaryExpression implements Expression {
public Value eval() { public Value eval() {
final Value value1 = expr1.eval(); final Value value1 = expr1.eval();
final Value value2 = expr2.eval(); final Value value2 = expr2.eval();
try {
return eval(value1, value2);
} catch (OperationIsNotSupportedException ex) {
if (Functions.isExists(operation.toString())) {
return Functions.get(operation.toString()).execute(value1, value2);
}
throw ex;
}
}
private Value eval(Value value1, Value value2) throws OperationIsNotSupportedException {
switch (operation) { switch (operation) {
case ADD: return add(value1, value2); case ADD: return add(value1, value2);
case SUBTRACT: return subtract(value1, value2); case SUBTRACT: return subtract(value1, value2);
@ -75,10 +87,10 @@ public final class BinaryExpression implements Expression {
private Value add(Value value1, Value value2) { private Value add(Value value1, Value value2) {
switch (value1.type()) { switch (value1.type()) {
case Types.NUMBER: return add((NumberValue) value1, value2); case Types.NUMBER: return add((NumberValue) value1, value2);
case Types.STRING: return new StringValue(value1.asString() + value2.asString());
case Types.ARRAY: return ArrayValue.add((ArrayValue) value1, value2); case Types.ARRAY: return ArrayValue.add((ArrayValue) value1, value2);
case Types.MAP: /* TODO: merge maps */ case Types.MAP: /* TODO: merge maps */
case Types.FUNCTION: /* TODO: combining functions */ case Types.FUNCTION: /* TODO: combining functions */
case Types.STRING:
default: default:
// Concatenation strings // Concatenation strings
return new StringValue(value1.asString() + value2.asString()); return new StringValue(value1.asString() + value2.asString());