src/cmd/compile/internal/types2/exprstring_test.go

// UNREVIEWED
// 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.

package types2_test

import (
	"testing"

	"cmd/compile/internal/syntax"
	. "cmd/compile/internal/types2"
)

var testExprs = []testEntry{
	// basic type literals
	dup("x"),
	dup("true"),
	dup("42"),
	dup("3.1415"),
	dup("2.71828i"),
	dup(`'a'`),
	dup(`"foo"`),
	dup("`bar`"),

	// func and composite literals
	{"func(){}", "(func() literal)"},
	{"func(x int) complex128 {}", "(func(x int) complex128 literal)"},
	{"[]int{1, 2, 3}", "([]int literal)"},

	// non-type expressions
	dup("(x)"),
	dup("x.f"),
	dup("a[i]"),

	dup("s[:]"),
	dup("s[i:]"),
	dup("s[:j]"),
	dup("s[i:j]"),
	dup("s[:j:k]"),
	dup("s[i:j:k]"),

	dup("x.(T)"),

	dup("x.([10]int)"),
	dup("x.([...]int)"),

	dup("x.(struct{})"),
	dup("x.(struct{x int; y, z float32; E})"),

	dup("x.(func())"),
	dup("x.(func(x int))"),
	dup("x.(func() int)"),
	dup("x.(func(x, y int, z float32) (r int))"),
	dup("x.(func(a, b, c int))"),
	dup("x.(func(x ...T))"),

	dup("x.(interface{})"),
	dup("x.(interface{m(); n(x int); E})"),
	dup("x.(interface{m(); n(x int) T; E; F})"),

	dup("x.(map[K]V)"),

	dup("x.(chan E)"),
	dup("x.(<-chan E)"),
	dup("x.(chan<- chan int)"),
	dup("x.(chan<- <-chan int)"),
	dup("x.(<-chan chan int)"),
	dup("x.(chan (<-chan int))"),

	dup("f()"),
	dup("f(x)"),
	dup("int(x)"),
	dup("f(x, x + y)"),
	dup("f(s...)"),
	dup("f(a, s...)"),

	dup("*x"),
	dup("&x"),
	dup("x + y"),
	dup("x + y << (2 * s)"),
}

func TestExprString(t *testing.T) {
	for _, test := range testExprs {
		src := "package p; var _ = " + test.src
		f, err := parseSrc("expr", src)
		if err != nil {
			t.Errorf("%s: %s", test.src, err)
			continue
		}
		x := f.DeclList[0].(*syntax.VarDecl).Values
		if got := ExprString(x); got != test.str {
			t.Errorf("%s: got %s, want %s", test.src, got, test.str)
		}
	}
}