1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83
84. 84
85. 85
86. 86
87. 87
88. 88
89. 89
90. 90
91. 91
92. 92
93. 93
94. 94
95. 95
96. 96
97. 97
98. 98
99. 99
100. 100
101. 101
102. 102
103. 103
104. 104
105. 105
106. 106
107. 107
108. 108
109. 109
110. 110
111. 111
112. 112
113. 113
114. 114
115. 115
116. 116
117. 117
118. 118
119. 119
120. 120
121. 121
122. 122
123. 123
124. 124
125. 125
126. 126
127. 127
128. 128
129. 129
130. 130
131. 131
132. 132

// Copyright 2017 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package code

import (
	"bytes"
	"context"
	"strings"

	"code.gitea.io/gitea/modules/highlight"
	"code.gitea.io/gitea/modules/timeutil"
	"code.gitea.io/gitea/modules/util"
)

// Result a search result to display
type Result struct {
	RepoID         int64
	Filename       string
	CommitID       string
	UpdatedUnix    timeutil.TimeStamp
	Language       string
	Color          string
	LineNumbers    []int
	FormattedLines string
}

func indices(content string, selectionStartIndex, selectionEndIndex int) (int, int) {
	startIndex := selectionStartIndex
	numLinesBefore := 0
	for ; startIndex > 0; startIndex-- {
		if content[startIndex-1] == '\n' {
			if numLinesBefore == 1 {
				break
			}
			numLinesBefore++
		}
	}

	endIndex := selectionEndIndex
	numLinesAfter := 0
	for ; endIndex < len(content); endIndex++ {
		if content[endIndex] == '\n' {
			if numLinesAfter == 1 {
				break
			}
			numLinesAfter++
		}
	}

	return startIndex, endIndex
}

func writeStrings(buf *bytes.Buffer, strs ...string) error {
	for _, s := range strs {
		_, err := buf.WriteString(s)
		if err != nil {
			return err
		}
	}
	return nil
}

func searchResult(result *SearchResult, startIndex, endIndex int) (*Result, error) {
	startLineNum := 1 + strings.Count(result.Content[:startIndex], "\n")

	var formattedLinesBuffer bytes.Buffer

	contentLines := strings.SplitAfter(result.Content[startIndex:endIndex], "\n")
	lineNumbers := make([]int, len(contentLines))
	index := startIndex
	for i, line := range contentLines {
		var err error
		if index < result.EndIndex &&
			result.StartIndex < index+len(line) &&
			result.StartIndex < result.EndIndex {
			openActiveIndex := util.Max(result.StartIndex-index, 0)
			closeActiveIndex := util.Min(result.EndIndex-index, len(line))
			err = writeStrings(&formattedLinesBuffer,
				line[:openActiveIndex],
				line[openActiveIndex:closeActiveIndex],
				line[closeActiveIndex:],
			)
		} else {
			err = writeStrings(&formattedLinesBuffer,
				line,
			)
		}
		if err != nil {
			return nil, err
		}

		lineNumbers[i] = startLineNum + i
		index += len(line)
	}

	highlighted, _ := highlight.Code(result.Filename, "", formattedLinesBuffer.String())

	return &Result{
		RepoID:         result.RepoID,
		Filename:       result.Filename,
		CommitID:       result.CommitID,
		UpdatedUnix:    result.UpdatedUnix,
		Language:       result.Language,
		Color:          result.Color,
		LineNumbers:    lineNumbers,
		FormattedLines: highlighted,
	}, nil
}

// PerformSearch perform a search on a repository
func PerformSearch(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int, []*Result, []*SearchResultLanguages, error) {
	if len(keyword) == 0 {
		return 0, nil, nil, nil
	}

	total, results, resultLanguages, err := indexer.Search(ctx, repoIDs, language, keyword, page, pageSize, isMatch)
	if err != nil {
		return 0, nil, nil, err
	}

	displayResults := make([]*Result, len(results))

	for i, result := range results {
		startIndex, endIndex := indices(result.Content, result.StartIndex, result.EndIndex)
		displayResults[i], err = searchResult(result, startIndex, endIndex)
		if err != nil {
			return 0, nil, nil, err
		}
	}
	return int(total), displayResults, resultLanguages, nil
}