example_test.go

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package format_test
     6  
     7  import (
     8  	"bytes"
     9  	"fmt"
    10  	"go/format"
    11  	"go/parser"
    12  	"go/token"
    13  	"log"
    14  )
    15  
    16  func ExampleNode() {
    17  	const expr = "(6+2*3)/4"
    18  
    19  	// parser.ParseExpr parses the argument and returns the
    20  	// corresponding ast.Node.
    21  	node, err := parser.ParseExpr(expr)
    22  	if err != nil {
    23  		log.Fatal(err)
    24  	}
    25  
    26  	// Create a FileSet for node. Since the node does not come
    27  	// from a real source file, fset will be empty.
    28  	fset := token.NewFileSet()
    29  
    30  	var buf bytes.Buffer
    31  	err = format.Node(&buf, fset, node)
    32  	if err != nil {
    33  		log.Fatal(err)
    34  	}
    35  
    36  	fmt.Println(buf.String())
    37  
    38  	// Output: (6 + 2*3) / 4
    39  }
    40
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