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Go 语言标准库

package printer

import "go/printer"

Package printer implements printing of AST nodes..

Go语言标准库 >>
  • func Fprint(output io.Writer, fset *token.FileSet, node interface{}) error
  • type CommentedNode
  • type Config
  • type Mode

    • func Fprint 

    func Fprint(output io.Writer, fset *token.FileSet, node interface{}) error

    Fprint "pretty-prints" an AST node to output. It calls Config.Fprint with default settings. 

    // Parse source file and extract the AST without comments for
// this function, with position information referring to the
// file set fset.
funcAST, fset := parseFunc("example_test.go", "ExampleFprint")

// Print the function body into buffer buf.
// The file set is provided to the printer so that it knows
// about the original source formatting and can add additional
// line breaks where they were present in the source.
var buf bytes.Buffer
printer.Fprint(&buf, fset, funcAST.Body)

// Remove braces {} enclosing the function body, unindent,
// and trim leading and trailing white space.
s := buf.String()
s = s[1 : len(s)-1]
s = strings.TrimSpace(strings.Replace(s, "\n\t", "\n", -1))

// Print the cleaned-up body text to stdout.
fmt.Println(s)

    Output:

    funcAST, fset := parseFunc("example_test.go", "ExampleFprint")

var buf bytes.Buffer
printer.Fprint(&buf, fset, funcAST.Body)

s := buf.String()
s = s[1 : len(s)-1]
s = strings.TrimSpace(strings.Replace(s, "\n\t", "\n", -1))

fmt.Println(s)

    type CommentedNode 

    type CommentedNode struct {
    Node     interface{} // *ast.File, or ast.Expr, ast.Decl, ast.Spec, or ast.Stmt
    Comments []*ast.CommentGroup
}

    A CommentedNode bundles an AST node and corresponding comments. It may be provided as argument to any of the Fprint functions.

    type Config 

    type Config struct {
    Mode     Mode // default: 0
    Tabwidth int  // default: 8
    Indent   int  // default: 0 (all code is indented at least by this much)
}

    A Config node controls the output of Fprint.

    func (*Config) Fprint 

    func (cfg *Config) Fprint(output io.Writer, fset *token.FileSet, node interface{}) error

    Fprint "pretty-prints" an AST node to output for a given configuration cfg. Position information is interpreted relative to the file set fset. The node type must be *ast.File, *CommentedNode, []ast.Decl, []ast.Stmt, or assignment-compatible to ast.Expr, ast.Decl, ast.Spec, or ast.Stmt.

    type Mode 

    type Mode uint

    A Mode value is a set of flags (or 0). They control printing. 

    const (
    RawFormat Mode = 1 << iota // do not use a tabwriter; if set, UseSpaces is ignored
    TabIndent                  // use tabs for indentation independent of UseSpaces
    UseSpaces                  // use spaces instead of tabs for alignment
    SourcePos                  // emit //line comments to preserve original source positions
)