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// Copyright 2016 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 syntax
import (
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"testing"
)
func TestPrint(t *testing.T) {
if testing.Short() {
t.Skip("skipping test in short mode")
}
ast, _ := ParseFile(*src_, func(err error) { t.Error(err) }, nil, AllowGenerics)
if ast != nil {
Fprint(testOut(), ast, LineForm)
fmt.Println()
}
}
type shortBuffer struct {
buf []byte
}
func (w *shortBuffer) Write(data []byte) (n int, err error) {
w.buf = append(w.buf, data...)
n = len(data)
if len(w.buf) > 10 {
err = io.ErrShortBuffer
}
return
}
func TestPrintError(t *testing.T) {
const src = "package p; var x int"
ast, err := Parse(nil, strings.NewReader(src), nil, nil, 0)
if err != nil {
t.Fatal(err)
}
var buf shortBuffer
_, err = Fprint(&buf, ast, 0)
if err == nil || err != io.ErrShortBuffer {
t.Errorf("got err = %s, want %s", err, io.ErrShortBuffer)
}
}
var stringTests = [][2]string{
dup("package p"),
dup("package p; type _ int; type T1 = struct{}; type ( _ *struct{}; T2 = float32 )"),
// generic type declarations
dup("package p; type _[T any] struct{}"),
dup("package p; type _[A, B, C interface{m()}] struct{}"),
dup("package p; type _[T any, A, B, C interface{m()}, X, Y, Z interface{~int}] struct{}"),
dup("package p; type _[P *T,] struct{}"),
dup("package p; type _[P *T, _ any] struct{}"),
{"package p; type _[P (*T),] struct{}", "package p; type _[P *T,] struct{}"},
{"package p; type _[P (*T), _ any] struct{}", "package p; type _[P *T, _ any] struct{}"},
{"package p; type _[P (T),] struct{}", "package p; type _[P T] struct{}"},
{"package p; type _[P (T), _ any] struct{}", "package p; type _[P T, _ any] struct{}"},
dup("package p; type _[P *struct{}] struct{}"),
{"package p; type _[P (*struct{})] struct{}", "package p; type _[P *struct{}] struct{}"},
{"package p; type _[P ([]int)] struct{}", "package p; type _[P []int] struct{}"},
dup("package p; type _ [P(T)]struct{}"),
dup("package p; type _ [P((T))]struct{}"),
dup("package p; type _ [P * *T]struct{}"),
dup("package p; type _ [P * T]struct{}"),
dup("package p; type _ [P(*T)]struct{}"),
dup("package p; type _ [P(**T)]struct{}"),
dup("package p; type _ [P * T - T]struct{}"),
// array type declarations
dup("package p; type _ [P * T]struct{}"),
dup("package p; type _ [P * T - T]struct{}"),
// generic function declarations
dup("package p; func _[T any]()"),
dup("package p; func _[A, B, C interface{m()}]()"),
dup("package p; func _[T any, A, B, C interface{m()}, X, Y, Z interface{~int}]()"),
// methods with generic receiver types
dup("package p; func (R[T]) _()"),
dup("package p; func (*R[A, B, C]) _()"),
dup("package p; func (_ *R[A, B, C]) _()"),
// type constraint literals with elided interfaces
dup("package p; func _[P ~int, Q int | string]() {}"),
dup("package p; func _[P struct{f int}, Q *P]() {}"),
// channels
dup("package p; type _ chan chan int"),
dup("package p; type _ chan (<-chan int)"),
dup("package p; type _ chan chan<- int"),
dup("package p; type _ <-chan chan int"),
dup("package p; type _ <-chan <-chan int"),
dup("package p; type _ <-chan chan<- int"),
dup("package p; type _ chan<- chan int"),
dup("package p; type _ chan<- <-chan int"),
dup("package p; type _ chan<- chan<- int"),
// TODO(gri) expand
}
func TestPrintString(t *testing.T) {
for _, test := range stringTests {
ast, err := Parse(nil, strings.NewReader(test[0]), nil, nil, AllowGenerics)
if err != nil {
t.Error(err)
continue
}
if got := String(ast); got != test[1] {
t.Errorf("%q: got %q", test[1], got)
}
}
}
func testOut() io.Writer {
if testing.Verbose() {
return os.Stdout
}
return ioutil.Discard
}
func dup(s string) [2]string { return [2]string{s, s} }
var exprTests = [][2]string{
// 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
dup("func() {}"),
dup("[]int{}"),
{"func(x int) complex128 { return 0 }", "func(x int) complex128 {…}"},
{"[]int{1, 2, 3}", "[]int{…}"},
// type expressions
dup("[1 << 10]byte"),
dup("[]int"),
dup("*int"),
dup("struct{x int}"),
dup("func()"),
dup("func(int, float32) string"),
dup("interface{m()}"),
dup("interface{m() string; n(x int)}"),
dup("interface{~int}"),
dup("interface{~int | ~float64 | ~string}"),
dup("interface{~int; m()}"),
dup("interface{~int | ~float64 | ~string; m() string; n(x int)}"),
dup("map[string]int"),
dup("chan E"),
dup("<-chan E"),
dup("chan<- E"),
// new interfaces
dup("interface{int}"),
dup("interface{~int}"),
dup("interface{~int}"),
dup("interface{int | string}"),
dup("interface{~int | ~string; float64; m()}"),
dup("interface{~a | ~b | ~c; ~int | ~string; float64; m()}"),
dup("interface{~T[int, string] | string}"),
// 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 TestShortString(t *testing.T) {
for _, test := range exprTests {
src := "package p; var _ = " + test[0]
ast, err := Parse(nil, strings.NewReader(src), nil, nil, AllowGenerics)
if err != nil {
t.Errorf("%s: %s", test[0], err)
continue
}
x := ast.DeclList[0].(*VarDecl).Values
if got := String(x); got != test[1] {
t.Errorf("%s: got %s, want %s", test[0], got, test[1])
}
}
}
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