/
postcss-import-parser.js
184 lines (146 loc) · 4.77 KB
/
postcss-import-parser.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
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
import postcss from 'postcss';
import valueParser from 'postcss-value-parser';
import { isUrlRequest, urlToRequest } from 'loader-utils';
import { normalizeUrl, resolveRequests } from '../utils';
const pluginName = 'postcss-import-parser';
export default postcss.plugin(pluginName, (options) => (css, result) => {
return new Promise((resolve, reject) => {
const importsMap = new Map();
const tasks = [];
// A counter is used instead of an index in callback css.walkAtRules because we mutate AST (atRule.remove())
let index = 0;
css.walkAtRules(/^import$/i, (atRule) => {
// Convert only top-level @import
if (atRule.parent.type !== 'root') {
return;
}
// Nodes do not exists - `@import url('http://') :root {}`
if (atRule.nodes) {
result.warn(
"It looks like you didn't end your @import statement correctly. Child nodes are attached to it.",
{ node: atRule }
);
return;
}
const { nodes } = valueParser(atRule.params);
// No nodes - `@import ;`
// Invalid type - `@import foo-bar;`
if (
nodes.length === 0 ||
(nodes[0].type !== 'string' && nodes[0].type !== 'function')
) {
result.warn(`Unable to find uri in "${atRule.toString()}"`, {
node: atRule,
});
return;
}
let isStringValue;
let url;
if (nodes[0].type === 'string') {
isStringValue = true;
url = nodes[0].value;
} else if (nodes[0].type === 'function') {
// Invalid function - `@import nourl(test.css);`
if (nodes[0].value.toLowerCase() !== 'url') {
result.warn(`Unable to find uri in "${atRule.toString()}"`, {
node: atRule,
});
return;
}
isStringValue =
nodes[0].nodes.length !== 0 && nodes[0].nodes[0].type === 'string';
url = isStringValue
? nodes[0].nodes[0].value
: valueParser.stringify(nodes[0].nodes);
}
// Empty url - `@import "";` or `@import url();`
if (url.trim().length === 0) {
result.warn(`Unable to find uri in "${atRule.toString()}"`, {
node: atRule,
});
return;
}
let request;
// May be url is server-relative url, but not //example.com
if (url.charAt(0) === '/' && url.charAt(1) !== '/') {
request = urlToRequest(url, options.rootContext);
}
const isRequestable = isUrlRequest(url);
if (isRequestable) {
url = normalizeUrl(url, isStringValue);
// Empty url after normalize - `@import '\
// \
// \
// ';
if (url.trim().length === 0) {
result.warn(`Unable to find uri in "${atRule.toString()}"`, {
node: atRule,
});
return;
}
}
const media = valueParser.stringify(nodes.slice(1)).trim().toLowerCase();
if (options.filter && !options.filter({ url, media })) {
return;
}
atRule.remove();
index += 1;
tasks.push(
Promise.resolve(index).then(async (currentIndex) => {
if (isRequestable || request) {
const importKey = url;
let importName = importsMap.get(importKey);
if (!importName) {
importName = `___CSS_LOADER_AT_RULE_IMPORT_${importsMap.size}___`;
importsMap.set(importKey, importName);
const { resolver, context } = options;
const possibleRequest = [url];
if (request) {
possibleRequest.push(request);
}
let resolvedUrl;
try {
resolvedUrl = await resolveRequests(
resolver,
context,
possibleRequest
);
} catch (error) {
throw error;
}
result.messages.push({
type: 'import',
value: {
importName,
url: options.urlHandler
? options.urlHandler(resolvedUrl)
: resolvedUrl,
index: currentIndex,
},
});
}
result.messages.push({
type: 'api-import',
value: {
type: 'internal',
importName,
media,
index: currentIndex,
},
});
return;
}
result.messages.push({
pluginName,
type: 'api-import',
value: { type: 'external', url, media, index: currentIndex },
});
})
);
});
Promise.all(tasks).then(
() => resolve(),
(error) => reject(error)
);
});
});