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scalarfuncs.go
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package opencypher
import (
"fmt"
"strconv"
)
func init() {
globalFuncs["toInteger"] = Function{
Name: "toInteger",
MinArgs: 1,
MaxArgs: 1,
ValueFunc: toIntegerFunc,
}
globalFuncs["toIntegerOrNull"] = Function{
Name: "toIntegerOrNull",
MinArgs: 1,
MaxArgs: 1,
ValueFunc: toIntegerFunc,
}
globalFuncs["toFloatOrNull"] = Function{
Name: "toFloatOrNull",
MinArgs: 1,
MaxArgs: 1,
ValueFunc: toFloatOrNullFunc,
}
globalFuncs["toFloat"] = Function{
Name: "toFloat",
MinArgs: 1,
MaxArgs: 1,
ValueFunc: toFloatFunc,
}
}
func toIntegerOrNullFunc(ctx *EvalContext, args []Value) (Value, error) {
v := args[0].Get()
if v == nil {
return RValue{}, nil
}
if i, ok := v.(int); ok {
return RValue{Value: i}, nil
}
if s, ok := v.(string); ok {
if i, err := strconv.Atoi(s); err == nil {
return RValue{Value: i}, nil
}
return RValue{}, nil
}
if f, ok := v.(float64); ok {
return RValue{Value: int(f)}, nil
}
if b, ok := v.(bool); ok {
if b {
return RValue{Value: 1}, nil
}
return RValue{Value: 0}, nil
}
return RValue{}, nil
}
func toIntegerFunc(ctx *EvalContext, args []Value) (Value, error) {
v := args[0].Get()
if v == nil {
return RValue{}, nil
}
if i, ok := v.(int); ok {
return RValue{Value: i}, nil
}
if s, ok := v.(string); ok {
i, err := strconv.Atoi(s)
if err == nil {
return RValue{Value: i}, nil
}
return RValue{}, err
}
if f, ok := v.(float64); ok {
return RValue{Value: int(f)}, nil
}
if b, ok := v.(bool); ok {
if b {
return RValue{Value: 1}, nil
}
return RValue{Value: 0}, nil
}
return nil, fmt.Errorf("Invalid integer value: %v", v)
}
func toFloatOrNullFunc(ctx *EvalContext, args []Value) (Value, error) {
v := args[0].Get()
if v == nil {
return RValue{}, nil
}
if i, ok := v.(int); ok {
return RValue{Value: float64(i)}, nil
}
if s, ok := v.(string); ok {
if i, err := strconv.ParseFloat(s, 64); err == nil {
return RValue{Value: i}, nil
}
return RValue{}, nil
}
if f, ok := v.(float64); ok {
return RValue{Value: f}, nil
}
return RValue{}, nil
}
func toFloatFunc(ctx *EvalContext, args []Value) (Value, error) {
v := args[0].Get()
if v == nil {
return RValue{}, nil
}
if i, ok := v.(int); ok {
return RValue{Value: float64(i)}, nil
}
if s, ok := v.(string); ok {
i, err := strconv.ParseFloat(s, 64)
if err == nil {
return RValue{Value: i}, nil
}
return RValue{}, err
}
if f, ok := v.(float64); ok {
return RValue{Value: f}, nil
}
return RValue{}, fmt.Errorf("Invalid float value: %v", v)
}