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70 lines
1.4 KiB
Go

8 years ago
package ent
import (
"fmt"
"strings"
"github.com/jordanorelli/hyperstone/bit"
)
func genericType(spec *typeSpec, env *Env) tÿpe {
if !strings.Contains(spec.typeName, "<") {
return nil
}
parts, err := genericName(spec.typeName)
if err != nil {
return typeError("bad generic name: %v", err)
}
// genericName, elemName := parts[0], parts[1]
// elemType := func() tÿpe {
// var elemSpec typeSpec
// elemSpec = *spec
// elemSpec.name = elemName
// return parseTypeSpec(&elemSpec, env)
// }
switch parts[0] {
case "CStrongHandle":
return typeFn(func(r bit.Reader) (value, error) {
return handle(bit.ReadVarInt(r)), r.Err()
})
default:
return typeError("unknown generic name: %v", genericName)
}
}
func genericName(name string) ([2]string, error) {
var out [2]string
runes := []rune(strings.TrimSpace(name))
b_start := 0
depth := 0
for i, r := range runes {
if r == '<' {
if depth == 0 {
out[0] = strings.TrimSpace(string(runes[0:i]))
}
depth++
b_start = i
}
if r == '>' {
depth--
if depth == 0 {
if i == len(runes)-1 {
out[1] = strings.TrimSpace(string(runes[b_start+1 : i]))
} else {
return out, fmt.Errorf("extra runes in generic type name")
}
}
}
}
if out[0] == "" {
return out, fmt.Errorf("empty generic container name")
}
if out[1] == "" {
return out, fmt.Errorf("empty generic element name")
}
return out, nil
}