Gecko [ 167.86.127.34 ]

Name	Size	Permission
testdata	[ DIR ]	drwxr-xr-x
api.go	13.6 KB	-rw-r--r--
api_test.go	41.52 KB	-rw-r--r--
assignments.go	8.58 KB	-rw-r--r--
builtins.go	17.25 KB	-rw-r--r--
builtins_test.go	7.54 KB	-rw-r--r--
call.go	13.86 KB	-rw-r--r--
check.go	12.43 KB	-rw-r--r--
check_test.go	8.65 KB	-rw-r--r--
conversions.go	4.86 KB	-rw-r--r--
decl.go	22.25 KB	-rw-r--r--
errors.go	3.14 KB	-rw-r--r--
eval.go	2.92 KB	-rw-r--r--
eval_test.go	7.12 KB	-rw-r--r--
example_test.go	8.77 KB	-rw-r--r--
expr.go	44.32 KB	-rw-r--r--
exprstring.go	4.54 KB	-rw-r--r--
exprstring_test.go	1.76 KB	-rw-r--r--
gccgosizes.go	1016 B	-rw-r--r--
gotype.go	8.4 KB	-rw-r--r--
hilbert_test.go	3.63 KB	-rw-r--r--
initorder.go	8.84 KB	-rw-r--r--
issues_test.go	12.86 KB	-rw-r--r--
labels.go	7.01 KB	-rw-r--r--
lookup.go	13.05 KB	-rw-r--r--
methodset.go	8.38 KB	-rw-r--r--
object.go	14.69 KB	-rw-r--r--
object_test.go	2.82 KB	-rw-r--r--
objset.go	927 B	-rw-r--r--
operand.go	7.46 KB	-rw-r--r--
package.go	2.19 KB	-rw-r--r--
predicates.go	9.01 KB	-rw-r--r--
resolver.go	20.76 KB	-rw-r--r--
resolver_test.go	4.58 KB	-rw-r--r--
return.go	4.23 KB	-rw-r--r--
scope.go	5.48 KB	-rw-r--r--
selection.go	3.99 KB	-rw-r--r--
self_test.go	2.2 KB	-rw-r--r--
sizes.go	6.61 KB	-rw-r--r--
sizes_test.go	2.46 KB	-rw-r--r--
stdlib_test.go	8.32 KB	-rw-r--r--
stmt.go	22.8 KB	-rw-r--r--
token_test.go	1.21 KB	-rw-r--r--
type.go	16.81 KB	-rw-r--r--
typestring.go	7.8 KB	-rw-r--r--
typestring_test.go	6.56 KB	-rw-r--r--
typexpr.go	20.6 KB	-rw-r--r--
universe.go	6.47 KB	-rw-r--r--

Code Editor : exprstring.go

// Copyright 2013 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.

// This file implements printing of expressions.

package types

import (
	"bytes"
	"go/ast"
)

// ExprString returns the (possibly shortened) string representation for x.
// Shortened representations are suitable for user interfaces but may not
// necessarily follow Go syntax.
func ExprString(x ast.Expr) string {
	var buf bytes.Buffer
	WriteExpr(&buf, x)
	return buf.String()
}

// WriteExpr writes the (possibly shortened) string representation for x to buf.
// Shortened representations are suitable for user interfaces but may not
// necessarily follow Go syntax.
func WriteExpr(buf *bytes.Buffer, x ast.Expr) {
	// The AST preserves source-level parentheses so there is
	// no need to introduce them here to correct for different
	// operator precedences. (This assumes that the AST was
	// generated by a Go parser.)

switch x := x.(type) {
	default:
		buf.WriteString("(bad expr)") // nil, ast.BadExpr, ast.KeyValueExpr

case *ast.Ident:
		buf.WriteString(x.Name)

case *ast.Ellipsis:
		buf.WriteString("...")
		if x.Elt != nil {
			WriteExpr(buf, x.Elt)
		}

case *ast.BasicLit:
		buf.WriteString(x.Value)

case *ast.FuncLit:
		buf.WriteByte('(')
		WriteExpr(buf, x.Type)
		buf.WriteString(" literal)") // shortened

case *ast.CompositeLit:
		buf.WriteByte('(')
		WriteExpr(buf, x.Type)
		buf.WriteString(" literal)") // shortened

case *ast.ParenExpr:
		buf.WriteByte('(')
		WriteExpr(buf, x.X)
		buf.WriteByte(')')

case *ast.SelectorExpr:
		WriteExpr(buf, x.X)
		buf.WriteByte('.')
		buf.WriteString(x.Sel.Name)

case *ast.IndexExpr:
		WriteExpr(buf, x.X)
		buf.WriteByte('[')
		WriteExpr(buf, x.Index)
		buf.WriteByte(']')

case *ast.SliceExpr:
		WriteExpr(buf, x.X)
		buf.WriteByte('[')
		if x.Low != nil {
			WriteExpr(buf, x.Low)
		}
		buf.WriteByte(':')
		if x.High != nil {
			WriteExpr(buf, x.High)
		}
		if x.Slice3 {
			buf.WriteByte(':')
			if x.Max != nil {
				WriteExpr(buf, x.Max)
			}
		}
		buf.WriteByte(']')

case *ast.TypeAssertExpr:
		WriteExpr(buf, x.X)
		buf.WriteString(".(")
		WriteExpr(buf, x.Type)
		buf.WriteByte(')')

case *ast.CallExpr:
		WriteExpr(buf, x.Fun)
		buf.WriteByte('(')
		for i, arg := range x.Args {
			if i > 0 {
				buf.WriteString(", ")
			}
			WriteExpr(buf, arg)
		}
		if x.Ellipsis.IsValid() {
			buf.WriteString("...")
		}
		buf.WriteByte(')')

case *ast.StarExpr:
		buf.WriteByte('*')
		WriteExpr(buf, x.X)

case *ast.UnaryExpr:
		buf.WriteString(x.Op.String())
		WriteExpr(buf, x.X)

case *ast.BinaryExpr:
		WriteExpr(buf, x.X)
		buf.WriteByte(' ')
		buf.WriteString(x.Op.String())
		buf.WriteByte(' ')
		WriteExpr(buf, x.Y)

case *ast.ArrayType:
		buf.WriteByte('[')
		if x.Len != nil {
			WriteExpr(buf, x.Len)
		}
		buf.WriteByte(']')
		WriteExpr(buf, x.Elt)

case *ast.StructType:
		buf.WriteString("struct{")
		writeFieldList(buf, x.Fields, "; ", false)
		buf.WriteByte('}')

case *ast.FuncType:
		buf.WriteString("func")
		writeSigExpr(buf, x)

case *ast.InterfaceType:
		buf.WriteString("interface{")
		writeFieldList(buf, x.Methods, "; ", true)
		buf.WriteByte('}')

case *ast.MapType:
		buf.WriteString("map[")
		WriteExpr(buf, x.Key)
		buf.WriteByte(']')
		WriteExpr(buf, x.Value)

case *ast.ChanType:
		var s string
		switch x.Dir {
		case ast.SEND:
			s = "chan<- "
		case ast.RECV:
			s = "<-chan "
		default:
			s = "chan "
		}
		buf.WriteString(s)
		WriteExpr(buf, x.Value)
	}
}

func writeSigExpr(buf *bytes.Buffer, sig *ast.FuncType) {
	buf.WriteByte('(')
	writeFieldList(buf, sig.Params, ", ", false)
	buf.WriteByte(')')

res := sig.Results
	n := res.NumFields()
	if n == 0 {
		// no result
		return
	}

buf.WriteByte(' ')
	if n == 1 && len(res.List[0].Names) == 0 {
		// single unnamed result
		WriteExpr(buf, res.List[0].Type)
		return
	}

// multiple or named result(s)
	buf.WriteByte('(')
	writeFieldList(buf, res, ", ", false)
	buf.WriteByte(')')
}

func writeFieldList(buf *bytes.Buffer, fields *ast.FieldList, sep string, iface bool) {
	for i, f := range fields.List {
		if i > 0 {
			buf.WriteString(sep)
		}

// field list names
		for i, name := range f.Names {
			if i > 0 {
				buf.WriteString(", ")
			}
			buf.WriteString(name.Name)
		}

// types of interface methods consist of signatures only
		if sig, _ := f.Type.(*ast.FuncType); sig != nil && iface {
			writeSigExpr(buf, sig)
			continue
		}

// named fields are separated with a blank from the field type
		if len(f.Names) > 0 {
			buf.WriteByte(' ')
		}

WriteExpr(buf, f.Type)

// ignore tag
	}
}

${this.title}

Code Editor : exprstring.go