-
Notifications
You must be signed in to change notification settings - Fork 145
/
diff.go
156 lines (137 loc) · 5.35 KB
/
diff.go
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
package plumbing
import (
"strings"
"github.com/sergi/go-diff/diffmatchpatch"
"gopkg.in/src-d/go-git.v4"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/object"
"gopkg.in/src-d/go-git.v4/utils/merkletrie"
"gopkg.in/src-d/hercules.v7/internal/core"
)
// FileDiff calculates the difference of files which were modified.
// It is a PipelineItem.
type FileDiff struct {
core.NoopMerger
CleanupDisabled bool
WhitespaceIgnore bool
}
const (
// ConfigFileDiffDisableCleanup is the name of the configuration option (FileDiff.Configure())
// to suppress diffmatchpatch.DiffCleanupSemanticLossless() which is supposed to improve
// the human interpretability of diffs.
ConfigFileDiffDisableCleanup = "FileDiff.NoCleanup"
// DependencyFileDiff is the name of the dependency provided by FileDiff.
DependencyFileDiff = "file_diff"
// ConfigFileWhitespaceIgnore is the name of the configuration option (FileDiff.Configure())
// to suppress whitespace changes which can pollute the core diff of the files
ConfigFileWhitespaceIgnore = "FileDiff.WhitespaceIgnore"
)
// FileDiffData is the type of the dependency provided by FileDiff.
type FileDiffData struct {
OldLinesOfCode int
NewLinesOfCode int
Diffs []diffmatchpatch.Diff
}
// Name of this PipelineItem. Uniquely identifies the type, used for mapping keys, etc.
func (diff *FileDiff) Name() string {
return "FileDiff"
}
// Provides returns the list of names of entities which are produced by this PipelineItem.
// Each produced entity will be inserted into `deps` of dependent Consume()-s according
// to this list. Also used by core.Registry to build the global map of providers.
func (diff *FileDiff) Provides() []string {
arr := [...]string{DependencyFileDiff}
return arr[:]
}
// Requires returns the list of names of entities which are needed by this PipelineItem.
// Each requested entity will be inserted into `deps` of Consume(). In turn, those
// entities are Provides() upstream.
func (diff *FileDiff) Requires() []string {
arr := [...]string{DependencyTreeChanges, DependencyBlobCache}
return arr[:]
}
// ListConfigurationOptions returns the list of changeable public properties of this PipelineItem.
func (diff *FileDiff) ListConfigurationOptions() []core.ConfigurationOption {
options := [...]core.ConfigurationOption{
{
Name: ConfigFileDiffDisableCleanup,
Description: "Do not apply additional heuristics to improve diffs.",
Flag: "no-diff-cleanup",
Type: core.BoolConfigurationOption,
Default: false},
{
Name: ConfigFileWhitespaceIgnore,
Description: "Ignore whitespace when computing diffs.",
Flag: "no-diff-whitespace",
Type: core.BoolConfigurationOption,
Default: false},
}
return options[:]
}
// Configure sets the properties previously published by ListConfigurationOptions().
func (diff *FileDiff) Configure(facts map[string]interface{}) error {
if val, exists := facts[ConfigFileDiffDisableCleanup].(bool); exists {
diff.CleanupDisabled = val
}
if val, exists := facts[ConfigFileWhitespaceIgnore].(bool); exists {
diff.WhitespaceIgnore = val
}
return nil
}
// Initialize resets the temporary caches and prepares this PipelineItem for a series of Consume()
// calls. The repository which is going to be analysed is supplied as an argument.
func (diff *FileDiff) Initialize(repository *git.Repository) error {
return nil
}
func stripWhitespace(str string, ignoreWhitespace bool) string {
if ignoreWhitespace {
response := strings.Replace(str, " ", "", -1)
return response
}
return str
}
// Consume runs this PipelineItem on the next commit data.
// `deps` contain all the results from upstream PipelineItem-s as requested by Requires().
// Additionally, DependencyCommit is always present there and represents the analysed *object.Commit.
// This function returns the mapping with analysis results. The keys must be the same as
// in Provides(). If there was an error, nil is returned.
func (diff *FileDiff) Consume(deps map[string]interface{}) (map[string]interface{}, error) {
result := map[string]FileDiffData{}
cache := deps[DependencyBlobCache].(map[plumbing.Hash]*CachedBlob)
treeDiff := deps[DependencyTreeChanges].(object.Changes)
for _, change := range treeDiff {
action, err := change.Action()
if err != nil {
return nil, err
}
switch action {
case merkletrie.Modify:
blobFrom := cache[change.From.TreeEntry.Hash]
blobTo := cache[change.To.TreeEntry.Hash]
// we are not validating UTF-8 here because for example
// git/git 4f7770c87ce3c302e1639a7737a6d2531fe4b160 fetch-pack.c is invalid UTF-8
strFrom, strTo := string(blobFrom.Data), string(blobTo.Data)
dmp := diffmatchpatch.New()
src, dst, _ := dmp.DiffLinesToRunes(stripWhitespace(strFrom, diff.WhitespaceIgnore), stripWhitespace(strTo, diff.WhitespaceIgnore))
diffs := dmp.DiffMainRunes(src, dst, false)
if !diff.CleanupDisabled {
diffs = dmp.DiffCleanupMerge(dmp.DiffCleanupSemanticLossless(diffs))
}
result[change.To.Name] = FileDiffData{
OldLinesOfCode: len(src),
NewLinesOfCode: len(dst),
Diffs: diffs,
}
default:
continue
}
}
return map[string]interface{}{DependencyFileDiff: result}, nil
}
// Fork clones this PipelineItem.
func (diff *FileDiff) Fork(n int) []core.PipelineItem {
return core.ForkSamePipelineItem(diff, n)
}
func init() {
core.Registry.Register(&FileDiff{})
}