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                [TOC] ## 概述 scanner包提供對utf-8文本的token掃描服務。它會從一個io.Reader獲取utf-8文本,通過對Scan方法的重復調用獲取一個個token。為了兼容已有的工具,NUL字符不被接受。如果第一個字符是表示utf-8編碼格式的BOM標記,會自動忽略該標記。 一般Scanner會跳過空白和Go注釋,并會識別所有go語言規格的字面量。它可以定制為只識別這些字面量的一個子集,也可以識別不同的空白字符 ## 語法 ``` func TokenString(tok rune) string type Position func (pos *Position) IsValid() bool func (pos Position) String() string type Scanner func (s *Scanner) Init(src io.Reader) *Scanner func (s *Scanner) Next() rune func (s *Scanner) Peek() rune func (s *Scanner) Pos() (pos Position) func (s *Scanner) Scan() rune func (s *Scanner) TokenText() string ``` ## 示例 ``` const src = ` // This is scanned code. if a > 10 { someParsable = text }` var s scanner.Scanner s.Init(strings.NewReader(src)) s.Filename = "example" for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() { fmt.Printf("%s: %s\n", s.Position, s.TokenText()) } // Output: // example:3:1: if // example:3:4: a // example:3:6: > // example:3:8: 10 // example:3:11: { // example:4:2: someParsable // example:4:15: = // example:4:17: text // example:5:1: } ```
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