printer

printer

https://pkg.go.dev/go/printer@go1.20.1

Package printer implements printing of AST nodes.

常量

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变量

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函数

func Fprint

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func Fprint(output io.Writer, fset *token.FileSet, node any) error

Fprint “pretty-prints” an AST node to output. It calls Config.Fprint with default settings. Note that gofmt uses tabs for indentation but spaces for alignment; use format.Node (package go/format) for output that matches gofmt.

Example

类型

type CommentedNode

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type CommentedNode struct {
	Node     any // *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

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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.

(*Config) Fprint

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func (cfg *Config) Fprint(output io.Writer, fset *token.FileSet, node any) 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

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type Mode uint

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

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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 directives to preserve original source positions
)