UnflavoredMeson/monkey
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Strings

Browse Source
This commit is contained in:
Chuck Smith
2024-01-20 13:20:13 -05:00
parent 10821fc88a
commit 13c9062fed
9 changed files with 140 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
evaluator/evaluator.go
View File

@@ -94,6 +94,9 @@ func Eval(node ast.Node, env *object.Environment) object.Object {
return applyFunction(function, args)
case *ast.StringLiteral:
return &object.String{Value: node.Value}
}
return nil
@@ -178,6 +181,8 @@ func evalInfixExpression(operator string, left, right object.Object) object.Obje
switch {
case left.Type() == object.INTEGER_OBJ && right.Type() == object.INTEGER_OBJ:
return evalIntegerInfixExpression(operator, left, right)
case left.Type() == object.STRING_OBJ && right.Type() == object.STRING_OBJ:
return evalStringInfixExpression(operator, left, right)
case operator == "==":
return nativeBoolToBooleanObject(left == right)
case operator == "!=":
@@ -189,6 +194,17 @@ func evalInfixExpression(operator string, left, right object.Object) object.Obje
}
}
func evalStringInfixExpression(operator string, left object.Object, right object.Object) object.Object {
if operator != "+" {
return newError("unknown operator: %s %s %s", left.Type(), operator, right.Type())
}
leftVal := left.(*object.String).Value
rightVal := right.(*object.String).Value
return &object.String{Value: leftVal + rightVal}
}
func evalIntegerInfixExpression(operator string, left, right object.Object) object.Object {
leftVal := left.(*object.Integer).Value
rightVal := right.(*object.Integer).Value