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identifiers.go
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/
identifiers.go
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// Copyright 2020-2023 Buf Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ast
import (
"strings"
protoreflect "google.golang.org/protobuf/reflect/protoreflect"
)
// Identifier is a possibly-qualified name. This is used to distinguish
// ValueNode values that are references/identifiers vs. those that are
// string literals.
type Identifier = protoreflect.Name
func (n *IdentNode) Value() interface{} {
return n.AsIdentifier()
}
func (n *IdentNode) AsIdentifier() Identifier {
if n == nil {
return Identifier("")
}
return Identifier(n.Val)
}
func (n *CompoundIdentNode) Start() Token {
if len(n.Components) > 0 {
return n.Components[0].Start()
}
return TokenError
}
func (n *CompoundIdentNode) End() Token {
if len(n.Components) > 0 {
return n.Components[len(n.Components)-1].End()
}
return TokenError
}
func (n *CompoundIdentNode) Value() interface{} {
return n.AsIdentifier()
}
func (n *CompoundIdentNode) AsIdentifier() Identifier {
b := strings.Builder{}
for _, node := range n.GetComponents() {
switch node := node.Unwrap().(type) {
case *IdentNode:
b.WriteString(node.Val)
case *RuneNode:
b.WriteRune(node.Rune)
}
}
return Identifier(b.String())
}
func (n *IdentValueNode) AsIdentifier() Identifier {
if u := n.Unwrap(); u != nil {
return u.AsIdentifier()
}
return Identifier("")
}
func (n *IdentValueNode) Start() Token {
if u := n.Unwrap(); u != nil {
return u.Start()
}
return TokenUnknown
}
func (n *IdentValueNode) End() Token {
if u := n.Unwrap(); u != nil {
return u.End()
}
return TokenUnknown
}
func (n *IdentNode) ToKeyword() *IdentNode {
n.IsKeyword = true
return n
}
func (n *CompoundIdentNode) FilterIdents() []*IdentNode {
var idents []*IdentNode
for _, component := range n.Components {
if ident, ok := component.Val.(*ComplexIdentComponent_Ident); ok {
idents = append(idents, ident.Ident)
}
}
return idents
}
func (n *CompoundIdentNode) Split() (idents []*IdentNode, dots []*RuneNode) {
for _, component := range n.Components {
switch component := component.Val.(type) {
case *ComplexIdentComponent_Ident:
idents = append(idents, component.Ident)
case *ComplexIdentComponent_Dot:
dots = append(dots, component.Dot)
}
}
return
}