// Generic handler for retrieval of all variable types
// This is made generic through the errorName parameter which is the fully
// qualified name of the variable for error printing purposes
// You can better understand how this works by looking at the retrieval
// methods for arrays and objects
func GetVariableGeneric(varName string, errorName string, lineno int) Value {
// Check local table
in, value := GetFromScope(varName)
if in && value.Type == VALUE_UNDEFINED && !value.Written {
log.ValueError(lineno, errorName)
}
if in {
return value
}
// Check the global table
in, value = GetFromGlobal(varName)
if in && value.Type == VALUE_UNDEFINED && !value.Written {
log.ValueError(lineno, errorName)
}
if in {
return value
}
// At this point the value must be in neither table
log.ValueError(lineno, errorName)
return Value{Written: false, Type: VALUE_UNDEFINED, Line: lineno}
}
func GetArrayMember(arrayName string, index int, lineno int) Value {
// Find the array itself
array := GetVariable(arrayName, lineno)
if array.Type == VALUE_UNDEFINED {
log.ValueError(lineno, arrayName)
}
if array.Type != VALUE_ARRAY {
log.TypeViolation(lineno)
return Value{Type: VALUE_UNDEFINED, Line: lineno}
}
oldScope := Scope
Scope = array.Value.(map[string]Value)
keyValue := GetVariableGeneric(strconv.Itoa(index), fmt.Sprintf("%s[%d]", arrayName, index), lineno)
Scope = oldScope
return Value{Type: keyValue.Type, Value: keyValue.Value, Written: keyValue.Written, Line: keyValue.Line}
}
func GetObjectMember(objectName string, keyName string, lineno int) Value {
// Find the object itself
object := GetVariable(objectName, lineno)
if object.Type == VALUE_UNDEFINED {
log.ValueError(lineno, objectName)
}
if object.Type != VALUE_OBJECT {
log.TypeViolation(lineno)
return Value{Type: VALUE_UNDEFINED, Line: lineno}
}
// Set this object's fields as the new scope then restore it later
// This is, quite possibly, the smartest thing I have ever devised. Lol. Lol. Lol.
// Full of himself meter = 10/10. Chance of anyone ever seeing this: 1/10
oldScope := Scope
Scope = object.Value.(map[string]Value)
keyValue := GetVariableGeneric(keyName, objectName+"."+keyName, lineno)
Scope = oldScope
// All other error handling is done in gvg()
return Value{Type: keyValue.Type, Value: keyValue.Value, Written: keyValue.Written, Line: keyValue.Line}
}