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Source file src/go/scanner/example_test.go

Documentation: go/scanner

  // Copyright 2012 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 scanner_test
  
  import (
  	"fmt"
  	"go/scanner"
  	"go/token"
  )
  
  func ExampleScanner_Scan() {
  	// src is the input that we want to tokenize.
  	src := []byte("cos(x) + 1i*sin(x) // Euler")
  
  	// Initialize the scanner.
  	var s scanner.Scanner
  	fset := token.NewFileSet()                      // positions are relative to fset
  	file := fset.AddFile("", fset.Base(), len(src)) // register input "file"
  	s.Init(file, src, nil /* no error handler */, scanner.ScanComments)
  
  	// Repeated calls to Scan yield the token sequence found in the input.
  	for {
  		pos, tok, lit := s.Scan()
  		if tok == token.EOF {
  			break
  		}
  		fmt.Printf("%s\t%s\t%q\n", fset.Position(pos), tok, lit)
  	}
  
  	// output:
  	// 1:1	IDENT	"cos"
  	// 1:4	(	""
  	// 1:5	IDENT	"x"
  	// 1:6	)	""
  	// 1:8	+	""
  	// 1:10	IMAG	"1i"
  	// 1:12	*	""
  	// 1:13	IDENT	"sin"
  	// 1:16	(	""
  	// 1:17	IDENT	"x"
  	// 1:18	)	""
  	// 1:20	;	"\n"
  	// 1:20	COMMENT	"// Euler"
  }
  

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