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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
// Copyright 2018 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
package datadriven
import (
"bytes"
"fmt"
"io"
"strings"
"testing"
)
type testDataReader struct {
sourceName string
reader io.Reader
scanner *lineScanner
data TestData
rewrite *bytes.Buffer
}
func newTestDataReader(
t *testing.T, sourceName string, file io.Reader, record bool,
) *testDataReader {
t.Helper()
var rewrite *bytes.Buffer
if record {
rewrite = &bytes.Buffer{}
}
return &testDataReader{
sourceName: sourceName,
reader: file,
scanner: newLineScanner(file),
rewrite: rewrite,
}
}
func (r *testDataReader) Next(t *testing.T) bool {
t.Helper()
for r.scanner.Scan() {
// Ensure to not re-initialize r.data unless a line is read
// successfully. The reason is that we want to keep the last
// stored value of `Pos` after encountering EOF, to produce useful
// error messages.
r.data = TestData{}
line := r.scanner.Text()
r.emit(line)
// Update Pos early so that a late error message has an updated
// position.
pos := fmt.Sprintf("%s:%d", r.sourceName, r.scanner.line)
r.data.Pos = pos
line = strings.TrimSpace(line)
if strings.HasPrefix(line, "#") {
// Skip comment lines.
continue
}
// Support wrapping directive lines using \, for example:
// build-scalar \
// vars(int)
for strings.HasSuffix(line, `\`) && r.scanner.Scan() {
nextLine := r.scanner.Text()
r.emit(nextLine)
line = strings.TrimSuffix(line, `\`) + " " + strings.TrimSpace(nextLine)
}
cmd, args, err := ParseLine(line)
if err != nil {
t.Fatalf("%s: %v", pos, err)
}
if cmd == "" {
// Nothing to do here.
continue
}
r.data.Cmd = cmd
r.data.CmdArgs = args
if cmd == "subtest" {
// Subtest directives do not have an input and expected output.
return true
}
var buf bytes.Buffer
var separator bool
for r.scanner.Scan() {
line := r.scanner.Text()
if line == "----" {
separator = true
break
}
r.emit(line)
fmt.Fprintln(&buf, line)
}
r.data.Input = strings.TrimSpace(buf.String())
if separator {
r.readExpected(t)
}
r.data.Rewrite = *rewriteTestFiles
return true
}
return false
}
func (r *testDataReader) readExpected(t *testing.T) {
var buf bytes.Buffer
var line string
var allowBlankLines bool
if r.scanner.Scan() {
line = r.scanner.Text()
if line == "----" {
allowBlankLines = true
}
}
if allowBlankLines {
// Look for two successive lines of "----" before terminating.
for r.scanner.Scan() {
line = r.scanner.Text()
if line == "----" {
if r.scanner.Scan() {
line2 := r.scanner.Text()
if line2 == "----" {
// Read the following blank line (if we don't do this, we will emit
// an extra blank line when rewriting).
if r.scanner.Scan() && r.scanner.Text() != "" {
t.Fatal("non-blank line after end of double ---- separator section")
}
break
}
fmt.Fprintln(&buf, line)
fmt.Fprintln(&buf, line2)
continue
}
}
fmt.Fprintln(&buf, line)
}
} else {
// Terminate on first blank line.
for {
if strings.TrimSpace(line) == "" {
break
}
fmt.Fprintln(&buf, line)
if !r.scanner.Scan() {
break
}
line = r.scanner.Text()
}
}
r.data.Expected = buf.String()
}
func (r *testDataReader) emit(s string) {
if r.rewrite != nil {
r.rewrite.WriteString(s)
r.rewrite.WriteString("\n")
}
}
|
