-
-
Notifications
You must be signed in to change notification settings - Fork 629
/
LanguageUtils.js
156 lines (123 loc) · 4.93 KB
/
LanguageUtils.js
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
import baseLogger from './logger.js';
function capitalize(string) {
return string.charAt(0).toUpperCase() + string.slice(1);
}
class LanguageUtil {
constructor(options) {
this.options = options;
this.supportedLngs = this.options.supportedLngs || false;
this.logger = baseLogger.create('languageUtils');
}
getScriptPartFromCode(code) {
if (!code || code.indexOf('-') < 0) return null;
const p = code.split('-');
if (p.length === 2) return null;
p.pop();
if (p[p.length - 1].toLowerCase() === 'x') return null;
return this.formatLanguageCode(p.join('-'));
}
getLanguagePartFromCode(code) {
if (!code || code.indexOf('-') < 0) return code;
const p = code.split('-');
return this.formatLanguageCode(p[0]);
}
formatLanguageCode(code) {
// http://www.iana.org/assignments/language-tags/language-tags.xhtml
if (typeof code === 'string' && code.indexOf('-') > -1) {
const specialCases = ['hans', 'hant', 'latn', 'cyrl', 'cans', 'mong', 'arab'];
let p = code.split('-');
if (this.options.lowerCaseLng) {
p = p.map((part) => part.toLowerCase());
} else if (p.length === 2) {
p[0] = p[0].toLowerCase();
p[1] = p[1].toUpperCase();
if (specialCases.indexOf(p[1].toLowerCase()) > -1) p[1] = capitalize(p[1].toLowerCase());
} else if (p.length === 3) {
p[0] = p[0].toLowerCase();
// if lenght 2 guess it's a country
if (p[1].length === 2) p[1] = p[1].toUpperCase();
if (p[0] !== 'sgn' && p[2].length === 2) p[2] = p[2].toUpperCase();
if (specialCases.indexOf(p[1].toLowerCase()) > -1) p[1] = capitalize(p[1].toLowerCase());
if (specialCases.indexOf(p[2].toLowerCase()) > -1) p[2] = capitalize(p[2].toLowerCase());
}
return p.join('-');
}
return this.options.cleanCode || this.options.lowerCaseLng ? code.toLowerCase() : code;
}
isSupportedCode(code) {
if (this.options.load === 'languageOnly' || this.options.nonExplicitSupportedLngs) {
code = this.getLanguagePartFromCode(code);
}
return (
!this.supportedLngs || !this.supportedLngs.length || this.supportedLngs.indexOf(code) > -1
);
}
getBestMatchFromCodes(codes) {
if (!codes) return null;
let found;
// pick first supported code or if no restriction pick the first one (highest prio)
codes.forEach((code) => {
if (found) return;
let cleanedLng = this.formatLanguageCode(code);
if (!this.options.supportedLngs || this.isSupportedCode(cleanedLng)) found = cleanedLng;
});
// if we got no match in supportedLngs yet - check for similar locales
// first de-CH --> de
// second de-CH --> de-DE
if (!found && this.options.supportedLngs) {
codes.forEach((code) => {
if (found) return;
let lngOnly = this.getLanguagePartFromCode(code);
if (this.isSupportedCode(lngOnly)) return (found = lngOnly);
found = this.options.supportedLngs.find((supportedLng) => {
if (supportedLng.indexOf(lngOnly) === 0) return supportedLng;
});
});
}
// if nothing found, use fallbackLng
if (!found) found = this.getFallbackCodes(this.options.fallbackLng)[0];
return found;
}
getFallbackCodes(fallbacks, code) {
if (!fallbacks) return [];
if (typeof fallbacks === 'function') fallbacks = fallbacks(code);
if (typeof fallbacks === 'string') fallbacks = [fallbacks];
if (Object.prototype.toString.apply(fallbacks) === '[object Array]') return fallbacks;
if (!code) return fallbacks.default || [];
// asume we have an object defining fallbacks
let found = fallbacks[code];
if (!found) found = fallbacks[this.getScriptPartFromCode(code)];
if (!found) found = fallbacks[this.formatLanguageCode(code)];
if (!found) found = fallbacks[this.getLanguagePartFromCode(code)];
if (!found) found = fallbacks.default;
return found || [];
}
toResolveHierarchy(code, fallbackCode) {
const fallbackCodes = this.getFallbackCodes(
fallbackCode || this.options.fallbackLng || [],
code,
);
const codes = [];
const addCode = (c) => {
if (!c) return;
if (this.isSupportedCode(c)) {
codes.push(c);
} else {
this.logger.warn(`rejecting language code not found in supportedLngs: ${c}`);
}
};
if (typeof code === 'string' && code.indexOf('-') > -1) {
if (this.options.load !== 'languageOnly') addCode(this.formatLanguageCode(code));
if (this.options.load !== 'languageOnly' && this.options.load !== 'currentOnly')
addCode(this.getScriptPartFromCode(code));
if (this.options.load !== 'currentOnly') addCode(this.getLanguagePartFromCode(code));
} else if (typeof code === 'string') {
addCode(this.formatLanguageCode(code));
}
fallbackCodes.forEach((fc) => {
if (codes.indexOf(fc) < 0) addCode(this.formatLanguageCode(fc));
});
return codes;
}
}
export default LanguageUtil;