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types.go
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types.go
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package ast
import (
"errors"
"fmt"
"regexp"
"time"
)
type ValueType uint8
const (
InvalidType ValueType = iota
TFloat
TInt
TString
TBool
TRegex
TTime
TDuration
TLambda
TList
TStar
TMissing
)
type Missing struct{}
var MissingValue = &Missing{}
func (v ValueType) String() string {
switch v {
case TFloat:
return "float"
case TInt:
return "int"
case TString:
return "string"
case TBool:
return "boolean"
case TRegex:
return "regex"
case TTime:
return "time"
case TDuration:
return "duration"
case TLambda:
return "lambda"
case TList:
return "list"
case TStar:
return "star"
case TMissing:
return "missing"
}
return "invalid type"
}
func TypeOf(v interface{}) ValueType {
switch v.(type) {
case float64:
return TFloat
case int64:
return TInt
case string:
return TString
case bool:
return TBool
case *regexp.Regexp:
return TRegex
case time.Time:
return TTime
case time.Duration:
return TDuration
case *LambdaNode:
return TLambda
case []interface{}:
return TList
case *StarNode:
return TStar
case *Missing:
return TMissing
default:
return InvalidType
}
}
func ZeroValue(t ValueType) interface{} {
switch t {
case TFloat:
return float64(0)
case TInt:
return int64(0)
case TString:
return ""
case TBool:
return false
case TRegex:
return (*regexp.Regexp)(nil)
case TTime:
return time.Time{}
case TDuration:
return time.Duration(0)
case TLambda:
return (*LambdaNode)(nil)
case TList:
return []interface{}(nil)
case TStar:
return (*StarNode)(nil)
case TMissing:
return (*Missing)(nil)
default:
return errors.New("invalid type")
}
}
// Convert raw value to literal node, for all supported basic types.
func ValueToLiteralNode(pos Position, v interface{}) (Node, error) {
p := position{
pos: pos.Position(),
line: pos.Line(),
char: pos.Char(),
}
switch value := v.(type) {
case bool:
return &BoolNode{
position: p,
Bool: value,
}, nil
case int64:
return &NumberNode{
position: p,
IsInt: true,
Int64: value,
Base: 10,
}, nil
case float64:
return &NumberNode{
position: p,
IsFloat: true,
Float64: value,
}, nil
case time.Duration:
return &DurationNode{
position: p,
Dur: value,
}, nil
case string:
return &StringNode{
position: p,
Literal: value,
}, nil
case *regexp.Regexp:
return &RegexNode{
position: p,
Regex: value,
}, nil
case *LambdaNode:
var e Node
if value != nil {
e = value.Expression
}
return &LambdaNode{
position: p,
Expression: e,
}, nil
case *StarNode:
return &StarNode{
position: p,
}, nil
case []interface{}:
nodes := make([]Node, len(value))
var err error
for i, v := range value {
nodes[i], err = ValueToLiteralNode(pos, v)
if err != nil {
return nil, err
}
}
return &ListNode{
position: p,
Nodes: nodes,
}, nil
default:
return nil, fmt.Errorf("unsupported literal type %T", v)
}
}