82 lines
2.0 KiB
Go
82 lines
2.0 KiB
Go
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/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package loader
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import (
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"go/ast"
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"reflect"
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"strconv"
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)
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// TypeCallback is a callback called for each raw AST (gendecl, typespec) combo.
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type TypeCallback func(file *ast.File, decl *ast.GenDecl, spec *ast.TypeSpec)
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// EachType calls the given callback for each (gendecl, typespec) combo in the
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// given package. Generally, using markers.EachType is better when working
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// with marker data, and has a more convinient representation.
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func EachType(pkg *Package, cb TypeCallback) {
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visitor := &typeVisitor{
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callback: cb,
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}
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pkg.NeedSyntax()
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for _, file := range pkg.Syntax {
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visitor.file = file
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ast.Walk(visitor, file)
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}
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}
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// typeVisitor visits all TypeSpecs, calling the given callback for each.
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type typeVisitor struct {
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callback TypeCallback
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decl *ast.GenDecl
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file *ast.File
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}
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// Visit visits all TypeSpecs.
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func (v *typeVisitor) Visit(node ast.Node) ast.Visitor {
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if node == nil {
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v.decl = nil
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return v
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}
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switch typedNode := node.(type) {
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case *ast.File:
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v.file = typedNode
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return v
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case *ast.GenDecl:
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v.decl = typedNode
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return v
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case *ast.TypeSpec:
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v.callback(v.file, v.decl, typedNode)
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return nil // don't recurse
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default:
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return nil
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}
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}
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// ParseAstTag parses the given raw tag literal into a reflect.StructTag.
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func ParseAstTag(tag *ast.BasicLit) reflect.StructTag {
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if tag == nil {
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return reflect.StructTag("")
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}
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tagStr, err := strconv.Unquote(tag.Value)
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if err != nil {
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return reflect.StructTag("")
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}
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return reflect.StructTag(tagStr)
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}
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