swc_css_modules/
imports.rs

1//! Import/export analyzer
2
3use swc_atoms::Atom;
4use swc_css_ast::{
5    ComponentValue, Declaration, DeclarationName, ImportHref, ImportPrelude, Stylesheet, UrlValue,
6};
7use swc_css_visit::{Visit, VisitWith};
8
9pub fn analyze_imports(ss: &Stylesheet) -> Vec<Atom> {
10    let mut v = Analyzer {
11        imports: Default::default(),
12    };
13    ss.visit_with(&mut v);
14    v.imports.sort();
15    v.imports.dedup();
16    v.imports
17}
18
19struct Analyzer {
20    imports: Vec<Atom>,
21}
22
23impl Visit for Analyzer {
24    fn visit_import_prelude(&mut self, n: &ImportPrelude) {
25        n.visit_children_with(self);
26
27        match &*n.href {
28            ImportHref::Url(u) => {
29                if let Some(s) = &u.value {
30                    match &**s {
31                        UrlValue::Str(s) => {
32                            self.imports.push(s.value.clone());
33                        }
34                        UrlValue::Raw(v) => {
35                            self.imports.push(v.value.clone());
36                        }
37                    }
38                }
39            }
40            ImportHref::Str(s) => {
41                self.imports.push(s.value.clone());
42            }
43        }
44    }
45
46    fn visit_declaration(&mut self, d: &Declaration) {
47        d.visit_children_with(self);
48
49        if let DeclarationName::Ident(name) = &d.name {
50            if &*name.value == "composes" {
51                // composes: name from 'foo.css'
52                if d.value.len() >= 3 {
53                    match (&d.value[d.value.len() - 2], &d.value[d.value.len() - 1]) {
54                        (ComponentValue::Ident(ident), ComponentValue::Str(s))
55                            if ident.value == "from" =>
56                        {
57                            self.imports.push(s.value.clone());
58                        }
59                        _ => (),
60                    }
61                }
62            }
63        }
64    }
65}
swc_css_modules/imports.rs

swc_css_modules/
imports.rs
