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// Copyright 2011 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 ast
import (
"strings"
"testing"
)
var tests = []struct {
x any // x is printed as s
s string
}{
// basic types
{nil, "0 nil"},
{true, "0 true"},
{42, "0 42"},
{3.14, "0 3.14"},
{1 + 2.718i, "0 (1+2.718i)"},
{"foobar", "0 \"foobar\""},
// maps
{map[Expr]string{}, `0 map[ast.Expr]string (len = 0) {}`},
{map[string]int{"a": 1},
`0 map[string]int (len = 1) {
1 . "a": 1
2 }`},
// pointers
{new(int), "0 *0"},
// arrays
{[0]int{}, `0 [0]int {}`},
{[3]int{1, 2, 3},
`0 [3]int {
1 . 0: 1
2 . 1: 2
3 . 2: 3
4 }`},
{[...]int{42},
`0 [1]int {
1 . 0: 42
2 }`},
// slices
{[]int{}, `0 []int (len = 0) {}`},
{[]int{1, 2, 3},
`0 []int (len = 3) {
1 . 0: 1
2 . 1: 2
3 . 2: 3
4 }`},
// structs
{struct{}{}, `0 struct {} {}`},
{struct{ x int }{007}, `0 struct { x int } {}`},
{struct{ X, y int }{42, 991},
`0 struct { X int; y int } {
1 . X: 42
2 }`},
{struct{ X, Y int }{42, 991},
`0 struct { X int; Y int } {
1 . X: 42
2 . Y: 991
3 }`},
}
// Split s into lines, trim whitespace from all lines, and return
// the concatenated non-empty lines.
func trim(s string) string {
lines := strings.Split(s, "\n")
i := 0
for _, line := range lines {
line = strings.TrimSpace(line)
if line != "" {
lines[i] = line
i++
}
}
return strings.Join(lines[0:i], "\n")
}
func TestPrint(t *testing.T) {
var buf strings.Builder
for _, test := range tests {
buf.Reset()
if err := Fprint(&buf, nil, test.x, nil); err != nil {
t.Errorf("Fprint failed: %s", err)
}
if s, ts := trim(buf.String()), trim(test.s); s != ts {
t.Errorf("got:\n%s\nexpected:\n%s\n", s, ts)
}
}
}