-
Notifications
You must be signed in to change notification settings - Fork 1
/
bible.go
181 lines (155 loc) · 4.87 KB
/
bible.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
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
package english_bible
import (
"context"
"database/sql"
"errors"
"fmt"
"github.com/brianglass/orthocal"
"log"
"regexp"
"strings"
)
// These books have a single chapter
var chapterlessBooks = map[string]bool{
"OBA": true,
"PHM": true,
"2JN": true,
"3JN": true,
"JUD": true,
}
type Bible struct {
db *sql.DB
}
var (
refRe = regexp.MustCompile(`(?:([\w\s]+)\s+)?(\d.*)`)
rangeRe = regexp.MustCompile(`(?:(\d+)[\.:])?(\d+)(?:-(?:(\d+)[\.:])?(\d+))?`)
ReferenceParseError = errors.New("Error parsing scripture reference")
)
func NewBible(db *sql.DB) *Bible {
var self Bible
self.db = db
return &self
}
/*
Parse a scripture reference and return the scripture passage. A reference
includes a book name and a verse specification. A specification can
include multiple verse ranges separated by commas, where a range is a
collection of 1 or more contiguous verses. Chapter specification can be
implicit. A reference can look like any of the following:
Matt 1.1-25
Matt 4.25-5.13
Matt 10.32-36, 11.1
Matt 6.31-34, 7.9-11
Matt 10.1, 5-8
Mark 15.22, 25, 33-41
1 John 2.7-17
Jude 1-10
1 Cor 5.6-8; Gal 3.13-14
Prov 10, 3, 8
NOTE: this function directly interpolates values from the reference into
SQL. This is safe as long as the provided reference is coming from the
database. In other words, this method might be unsafe when used to lookup
user-provided references.
*/
func (self *Bible) Lookup(reference string) orthocal.Passage {
return self.LookupWithContext(context.Background(), reference)
}
func (self *Bible) LookupWithContext(ctx context.Context, reference string) orthocal.Passage {
var passage orthocal.Passage
sql, e := self.buildSQL(reference)
if e != nil {
log.Printf("Error building scripture lookup SQL '%s': %+v.", reference, e)
return passage
}
rows, e := self.db.QueryContext(ctx, sql)
if e != nil {
log.Printf("Got error querying the database for scripture '%s': %#v.", reference, e)
return passage
}
defer rows.Close()
for rows.Next() {
var verse orthocal.Verse
rows.Scan(&verse.Book, &verse.Chapter, &verse.Verse, &verse.Content)
passage = append(passage, verse)
}
return passage
}
func (self *Bible) buildSQL(reference string) (string, error) {
var conditionals []string
sql := "select book, chapter, verse, content from bible\n"
book := ""
for _, passage := range regexp.MustCompile(`\s*;\s*`).Split(reference, -1) {
// Get the book and specification
groups := refRe.FindStringSubmatch(passage)
if len(groups) < 3 {
return "", ReferenceParseError
}
// If the book is specified in this group, use it, else default to the previous one
if len(groups[1]) > 0 {
book = NormalizeBookName(groups[1])
}
specification := groups[2]
// Create a conditional for each verse range in the specification
var previousChapter string
for _, verseRange := range regexp.MustCompile(`,\s*`).Split(specification, -1) {
var conditional, chapter string
m := rangeRe.FindStringSubmatch(verseRange)
if len(m) < 5 {
return "", ReferenceParseError
}
if _, ok := chapterlessBooks[book]; ok {
// single-chapter books
chapter = "1"
} else {
// multi-chapter books
if len(m[1]) > 0 {
chapter = m[1]
} else {
// The chapter is implicit, so we use the chapter from the
// previous range. If there is no chapter from the previous
// range, then this range is specifying a full chapter and
// the chapter number will be in m[2] and chapter will be
// the empty string.
chapter = previousChapter
}
}
if len(m[4]) > 0 {
if len(m[3]) > 0 && m[3] != m[1] {
// Handle ranges that span chapters
conditional = fmt.Sprintf(`
(book = "%s"
and ((chapter = %s and verse >= %s) or
(chapter > %s and chapter < %s) or
(chapter = %s and verse <= %s)))`, book, chapter, m[2], chapter, m[3], m[3], m[4])
} else {
// Handle ranges that are contained within a single chapter
conditional = fmt.Sprintf(`
(book = "%s" and
chapter = %s and
verse between %s and %s)`, book, chapter, m[2], m[4])
}
} else if len(chapter) > 0 {
// Handle a single verse
conditional = fmt.Sprintf(`(book = "%s" and chapter = "%s" and verse = "%s")`, book, chapter, m[2])
} else {
// Here we handle full chapters
conditional = fmt.Sprintf(`(book = "%s" and chapter = "%s")`, book, m[2])
}
conditionals = append(conditionals, conditional)
// Remember the most recently used chapter, unless it was a full chapter
// If it was a full chapter, it can't be reused in a subsequent range.
if len(m[3]) > 0 {
previousChapter = m[3]
} else if len(m[1]) > 0 {
previousChapter = m[1]
}
}
}
if len(conditionals) > 1 {
// "Or" all the conditional clauses together
sql += "where (\n" + strings.Join(conditionals, "\nor ") + "\n)\n"
} else {
sql += "where " + conditionals[0] + "\n"
}
return sql, nil
}