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ident.go
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ident.go
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package gencel
import (
"fmt"
"go/ast"
)
type Ident struct {
Type string
GoType string
IsEllipsis bool
}
// getCelArgs converts native go types to cel-go types
func getCelArgs(args []ast.Expr) []Ident {
var celArgs = make([]Ident, len(args))
for i, a := range args {
celArgs[i] = astToIdent(a)
}
return celArgs
}
func goTypeToIdent(name string) Ident {
switch name {
case "string":
return Ident{Type: "cel.StringType", GoType: name}
case "bool":
return Ident{Type: "cel.BoolType", GoType: name}
case "Duration":
return Ident{Type: "cel.DurationType", GoType: "time.Duration"}
case "Time":
return Ident{Type: "cel.TimestampType", GoType: "time.Time"}
case "int", "int8", "int16", "int32", "int64":
return Ident{Type: "cel.IntType", GoType: name}
case "uint", "uint8", "uint16", "uint32", "uint64":
return Ident{Type: "cel.UintType", GoType: name}
case "float32", "float64":
return Ident{Type: "cel.DoubleType", GoType: name}
case "[]byte":
return Ident{Type: "cel.BytesType", GoType: name}
case "map":
return Ident{Type: "cel.MapType", GoType: name}
case "array", "slice":
return Ident{Type: "cel.ListType", GoType: name}
default:
return Ident{Type: "cel.DynType", GoType: name}
}
}
func astToIdent(a ast.Expr) Ident {
switch v := a.(type) {
case *ast.InterfaceType:
return Ident{Type: "cel.DynType", GoType: "interface{}"}
case *ast.Ident:
return goTypeToIdent(v.Name)
case *ast.Ellipsis:
return Ident{Type: "cel.DynType", IsEllipsis: true, GoType: astToIdent(v.Elt).GoType}
case *ast.SelectorExpr:
return goTypeToIdent(fmt.Sprintf("%s.%s", astToIdent(v.X).GoType, v.Sel.Name))
case *ast.ArrayType:
return Ident{Type: "cel.DynType", GoType: fmt.Sprintf("[]%s", astToIdent(v.Elt).GoType)}
case *ast.MapType:
return Ident{Type: "cel.DynType", GoType: fmt.Sprintf("map[%s]%s", astToIdent(v.Key).GoType, astToIdent(v.Value).GoType)}
default:
return Ident{Type: "cel.Unknown", GoType: "Unknown"}
}
}