1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
// Copyright 2012 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 contains tests verifying the types associated with an AST after
// type checking.
package types
import (
"go/ast"
"go/parser"
"testing"
)
const filename = "<src>"
func makePkg(t *testing.T, src string) (*Package, error) {
file, err := parser.ParseFile(fset, filename, src, parser.DeclarationErrors)
if err != nil {
return nil, err
}
pkg, err := Check(fset, []*ast.File{file})
return pkg, err
}
type testEntry struct {
src, str string
}
// dup returns a testEntry where both src and str are the same.
func dup(s string) testEntry {
return testEntry{s, s}
}
var testTypes = []testEntry{
// basic types
dup("int"),
dup("float32"),
dup("string"),
// arrays
dup("[10]int"),
// slices
dup("[]int"),
dup("[][]int"),
// structs
dup("struct{}"),
dup("struct{x int}"),
{`struct {
x, y int
z float32 "foo"
}`, `struct{x int; y int; z float32 "foo"}`},
{`struct {
string
elems []T
}`, `struct{string; elems []T}`},
// pointers
dup("*int"),
dup("***struct{}"),
dup("*struct{a int; b float32}"),
// functions
dup("func()"),
dup("func(x int)"),
{"func(x, y int)", "func(x int, y int)"},
{"func(x, y int, z string)", "func(x int, y int, z string)"},
dup("func(int)"),
{"func(int, string, byte)", "func(int, string, byte)"},
dup("func() int"),
{"func() (string)", "func() string"},
dup("func() (u int)"),
{"func() (u, v int, w string)", "func() (u int, v int, w string)"},
dup("func(int) string"),
dup("func(x int) string"),
dup("func(x int) (u string)"),
{"func(x, y int) (u string)", "func(x int, y int) (u string)"},
dup("func(...int) string"),
dup("func(x ...int) string"),
dup("func(x ...int) (u string)"),
{"func(x, y ...int) (u string)", "func(x int, y ...int) (u string)"},
// interfaces
dup("interface{}"),
dup("interface{m()}"),
dup(`interface{m(int) float32; String() string}`),
// TODO(gri) add test for interface w/ anonymous field
// maps
dup("map[string]int"),
{"map[struct{x, y int}][]byte", "map[struct{x int; y int}][]byte"},
// channels
dup("chan int"),
dup("chan<- func()"),
dup("<-chan []func() int"),
}
func TestTypes(t *testing.T) {
for _, test := range testTypes {
src := "package p; type T " + test.src
pkg, err := makePkg(t, src)
if err != nil {
t.Errorf("%s: %s", src, err)
continue
}
typ := underlying(pkg.Scope.Lookup("T").GetType())
str := typeString(typ)
if str != test.str {
t.Errorf("%s: got %s, want %s", test.src, str, test.str)
}
}
}
var testExprs = []testEntry{
// basic type literals
dup("x"),
dup("true"),
dup("42"),
dup("3.1415"),
dup("2.71828i"),
dup(`'a'`),
dup(`"foo"`),
dup("`bar`"),
// arbitrary expressions
dup("&x"),
dup("*&x"),
dup("(x)"),
dup("x + y"),
dup("x + y * 10"),
dup("t.foo"),
dup("s[0]"),
dup("s[x:y]"),
dup("s[:y]"),
dup("s[x:]"),
dup("s[:]"),
dup("f(1, 2.3)"),
dup("-f(10, 20)"),
dup("f(x + y, +3.1415)"),
{"func(a, b int) {}", "(func literal)"},
{"func(a, b int) []int {}(1, 2)[x]", "(func literal)(1, 2)[x]"},
{"[]int{1, 2, 3}", "(composite literal)"},
{"[]int{1, 2, 3}[x:]", "(composite literal)[x:]"},
{"i.([]string)", "i.(...)"},
}
func TestExprs(t *testing.T) {
for _, test := range testExprs {
src := "package p; var _ = " + test.src + "; var (x, y int; s []string; f func(int, float32) int; i interface{}; t interface { foo() })"
file, err := parser.ParseFile(fset, filename, src, parser.DeclarationErrors)
if err != nil {
t.Errorf("%s: %s", src, err)
continue
}
// TODO(gri) writing the code below w/o the decl variable will
// cause a 386 compiler error (out of fixed registers)
decl := file.Decls[0].(*ast.GenDecl)
expr := decl.Specs[0].(*ast.ValueSpec).Values[0]
str := exprString(expr)
if str != test.str {
t.Errorf("%s: got %s, want %s", test.src, str, test.str)
}
}
}
|
