81 lines
1.6 KiB
Go
81 lines
1.6 KiB
Go
// Copyright 2018 Google LLC
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package globals
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import (
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"go/token"
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)
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// SymKind specifies the kind of a global symbol. For example, a variable, const
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// function, etc.
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type SymKind int
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// Constants for different kinds of symbols.
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const (
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KindUnknown SymKind = iota
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KindImport
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KindType
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KindVar
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KindConst
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KindFunction
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KindReceiver
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KindParameter
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KindResult
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KindTag
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)
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type symbol struct {
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kind SymKind
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pos token.Pos
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scope *scope
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}
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type scope struct {
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outer *scope
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syms map[string]*symbol
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}
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func newScope(outer *scope) *scope {
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return &scope{
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outer: outer,
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syms: make(map[string]*symbol),
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}
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}
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func (s *scope) isGlobal() bool {
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return s.outer == nil
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}
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func (s *scope) lookup(n string) *symbol {
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return s.syms[n]
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}
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func (s *scope) deepLookup(n string) *symbol {
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for x := s; x != nil; x = x.outer {
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if sym := x.lookup(n); sym != nil {
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return sym
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}
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}
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return nil
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}
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func (s *scope) add(name string, kind SymKind, pos token.Pos) {
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s.syms[name] = &symbol{
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kind: kind,
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pos: pos,
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scope: s,
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}
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}
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