go stack 源码
golang stack 代码
文件路径：/src/cmd/asm/internal/lex/stack.go
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package lex
import (
"text/scanner"
"cmd/internal/src"
)
// A Stack is a stack of TokenReaders. As the top TokenReader hits EOF,
// it resumes reading the next one down.
type Stack struct {
tr []TokenReader
}
// Push adds tr to the top (end) of the input stack. (Popping happens automatically.)
func (s *Stack) Push(tr TokenReader) {
s.tr = append(s.tr, tr)
}
func (s *Stack) Next() ScanToken {
tos := s.tr[len(s.tr)-1]
tok := tos.Next()
for tok == scanner.EOF && len(s.tr) > 1 {
tos.Close()
// Pop the topmost item from the stack and resume with the next one down.
s.tr = s.tr[:len(s.tr)-1]
tok = s.Next()
}
return tok
}
func (s *Stack) Text() string {
return s.tr[len(s.tr)-1].Text()
}
func (s *Stack) File() string {
return s.Base().Filename()
}
func (s *Stack) Base() *src.PosBase {
return s.tr[len(s.tr)-1].Base()
}
func (s *Stack) SetBase(base *src.PosBase) {
s.tr[len(s.tr)-1].SetBase(base)
}
func (s *Stack) Line() int {
return s.tr[len(s.tr)-1].Line()
}
func (s *Stack) Col() int {
return s.tr[len(s.tr)-1].Col()
}
func (s *Stack) Close() { // Unused.
}
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