ce4c83ff
 wxy
初始提交
|
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
|
var Parser = require('stylus/lib/parser');
var Visitor = require('stylus/lib/visitor');
var nodes = require('stylus/lib/nodes');
module.exports = listImports;
// ImportVisitor is a simple stylus ast visitor that navigates the graph
// building a list of imports in it.
function ImportVisitor() {
Visitor.apply(this, arguments);
this.importPaths = [];
}
ImportVisitor.prototype = Object.create(Visitor.prototype);
ImportVisitor.prototype.constructor = ImportVisitor;
ImportVisitor.prototype.visitImport = function(node) {
this.importPaths.push(node.path.first.string);
return node;
};
ImportVisitor.prototype.visitRoot = function(block){
for (var i = 0; i < block.nodes.length; ++i) {
this.visit(block.nodes[i]);
}
return block;
};
ImportVisitor.prototype.visitExpression = function(expr) {
for (var i = 0; i < expr.nodes.length; ++i) {
this.visit(expr.nodes[i]);
}
return expr;
};
ImportVisitor.prototype.visitCall = function(fn) {
if (fn.name === 'use' || fn.name === 'json') {
this.importPaths.push(fn.args.first.string);
}
return fn;
};
ImportVisitor.prototype.visitSelector = function(sel) {
for (var i = 0; i < sel.block.nodes.length; i++) {
this.visit(sel.block.nodes[i]);
}
return sel;
}
ImportVisitor.prototype.visitBlock = ImportVisitor.prototype.visitRoot;
ImportVisitor.prototype.visitGroup = ImportVisitor.prototype.visitRoot;
// Returns a list of paths that given source imports.
function listImports(source, options) {
// Store source -> imports work in a cache. The Parser is the most expensive
// part of stylus and we can't use their cache without creating undesired side
// effects later during the actual render. In single run builds this will
// benefit repeated files imported like common styling. In multiple run builds
// this will help stylus import trees when a dependency changes, the higher up
// files won't need to be parsed again.
var cache = options.cache;
if (cache && cache[source]) { return cache[source]; }
// Current idea here is to silence errors and let them rise in stylus's
// renderer which has more handling so that the error message is more
// meaningful and easy to understand.
try {
var ast = new Parser(source, { cache: false }).parse();
} catch (e) {
return [];
}
var importVisitor = new ImportVisitor(ast, {});
importVisitor.visit(ast);
if (cache) {
cache[source] = importVisitor.importPaths;
}
return importVisitor.importPaths;
}
|
