fallow_extract/
sfc.rs

1//! Vue/Svelte Single File Component (SFC) script and style extraction.
2//!
3//! Extracts `<script>` block content from `.vue` and `.svelte` files using regex,
4//! handling `lang`, `src`, and `generic` attributes, and filtering HTML comments.
5//! Also extracts `<style>` block sources (`@import` / `@use` / `@forward` /
6//! `@plugin` and `<style src="...">`) so referenced CSS / SCSS files become
7//! reachable from the component, preventing false `unused-files` reports on
8//! co-located styles.
9
10use std::path::Path;
11use std::sync::LazyLock;
12
13use oxc_allocator::Allocator;
14use oxc_ast_visit::Visit;
15use oxc_parser::Parser;
16use oxc_span::SourceType;
17use rustc_hash::{FxHashMap, FxHashSet};
18
19use crate::asset_url::normalize_asset_url;
20use crate::parse::compute_import_binding_usage;
21use crate::sfc_template::{SfcKind, collect_template_usage_with_bound_targets};
22use crate::visitor::ModuleInfoExtractor;
23use crate::{ImportInfo, ImportedName, ModuleInfo};
24use fallow_types::discover::FileId;
25use fallow_types::extract::{FunctionComplexity, byte_offset_to_line_col, compute_line_offsets};
26use oxc_span::Span;
27
28/// Regex to extract `<script>` block content from Vue/Svelte SFCs.
29/// The attrs pattern handles `>` inside quoted attribute values (e.g., `generic="T extends Foo<Bar>"`).
30static SCRIPT_BLOCK_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
31    regex::Regex::new(
32        r#"(?is)<script\b(?P<attrs>(?:[^>"']|"[^"]*"|'[^']*')*)>(?P<body>[\s\S]*?)</script>"#,
33    )
34    .expect("valid regex")
35});
36
37/// Regex to extract the `lang` attribute value from a script tag.
38static LANG_ATTR_RE: LazyLock<regex::Regex> =
39    LazyLock::new(|| regex::Regex::new(r#"lang\s*=\s*["'](\w+)["']"#).expect("valid regex"));
40
41/// Regex to extract the `src` attribute value from a script tag.
42/// Requires whitespace (or start of string) before `src` to avoid matching `data-src` etc.
43static SRC_ATTR_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
44    regex::Regex::new(r#"(?:^|\s)src\s*=\s*["']([^"']+)["']"#).expect("valid regex")
45});
46
47/// Regex to detect Vue's bare `setup` attribute.
48static SETUP_ATTR_RE: LazyLock<regex::Regex> =
49    LazyLock::new(|| regex::Regex::new(r"(?:^|\s)setup(?:\s|$)").expect("valid regex"));
50
51/// Regex to detect Svelte's `context="module"` attribute.
52static CONTEXT_MODULE_ATTR_RE: LazyLock<regex::Regex> =
53    LazyLock::new(|| regex::Regex::new(r#"context\s*=\s*["']module["']"#).expect("valid regex"));
54
55/// Regex to extract Vue's `generic="..."` attribute value (script-setup
56/// generics). Matches the contents between the quotes and stops at the
57/// closing quote, mirroring `LANG_ATTR_RE`.
58static VUE_GENERIC_ATTR_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
59    regex::Regex::new(r#"(?:^|\s)generic\s*=\s*"([^"]*)"|(?:^|\s)generic\s*=\s*'([^']*)'"#)
60        .expect("valid regex")
61});
62
63/// Regex to extract Svelte's `generics="..."` attribute value (Svelte 4
64/// generic script attribute, repurposed by some Svelte 5 code).
65static SVELTE_GENERICS_ATTR_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
66    regex::Regex::new(r#"(?:^|\s)generics\s*=\s*"([^"]*)"|(?:^|\s)generics\s*=\s*'([^']*)'"#)
67        .expect("valid regex")
68});
69
70/// Regex to match HTML comments for filtering script blocks inside comments.
71static HTML_COMMENT_RE: LazyLock<regex::Regex> =
72    LazyLock::new(|| regex::Regex::new(r"(?s)<!--.*?-->").expect("valid regex"));
73
74/// Regex to extract `<style>` block content from Vue/Svelte SFCs.
75/// Mirrors `SCRIPT_BLOCK_RE`: handles `>` inside quoted attribute values and
76/// captures the body so `@import` / `@use` / `@forward` directives can be parsed.
77static STYLE_BLOCK_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
78    regex::Regex::new(
79        r#"(?is)<style\b(?P<attrs>(?:[^>"']|"[^"]*"|'[^']*')*)>(?P<body>[\s\S]*?)</style>"#,
80    )
81    .expect("valid regex")
82});
83
84/// An extracted `<script>` block from a Vue or Svelte SFC.
85pub struct SfcScript {
86    /// The script body text.
87    pub body: String,
88    /// Whether the script uses TypeScript (`lang="ts"` or `lang="tsx"`).
89    pub is_typescript: bool,
90    /// Whether the script uses JSX syntax (`lang="tsx"` or `lang="jsx"`).
91    pub is_jsx: bool,
92    /// Byte offset of the script body within the full SFC source.
93    pub byte_offset: usize,
94    /// External script source path from `src` attribute.
95    pub src: Option<String>,
96    /// Whether this script is a Vue `<script setup>` block.
97    pub is_setup: bool,
98    /// Whether this script is a Svelte module-context block.
99    pub is_context_module: bool,
100    /// Type-parameter list from a `generic="..."` (Vue) or `generics="..."`
101    /// (Svelte) attribute on the script tag. Holds the bare constraint, no
102    /// surrounding angle brackets, e.g. `T extends Test<boolean>`.
103    pub generic_attr: Option<String>,
104}
105
106/// Extract all `<script>` blocks from a Vue/Svelte SFC source string.
107pub fn extract_sfc_scripts(source: &str) -> Vec<SfcScript> {
108    // Build HTML comment ranges to filter out <script> blocks inside comments.
109    // Using ranges instead of source replacement avoids corrupting script body content
110    // (e.g., string literals containing "<!--" would be destroyed by replacement).
111    let comment_ranges: Vec<(usize, usize)> = HTML_COMMENT_RE
112        .find_iter(source)
113        .map(|m| (m.start(), m.end()))
114        .collect();
115
116    SCRIPT_BLOCK_RE
117        .captures_iter(source)
118        .filter(|cap| {
119            let start = cap.get(0).map_or(0, |m| m.start());
120            !comment_ranges
121                .iter()
122                .any(|&(cs, ce)| start >= cs && start < ce)
123        })
124        .map(|cap| {
125            let attrs = cap.name("attrs").map_or("", |m| m.as_str());
126            let body_match = cap.name("body");
127            let byte_offset = body_match.map_or(0, |m| m.start());
128            let body = body_match.map_or("", |m| m.as_str()).to_string();
129            let lang = LANG_ATTR_RE
130                .captures(attrs)
131                .and_then(|c| c.get(1))
132                .map(|m| m.as_str());
133            let is_typescript = matches!(lang, Some("ts" | "tsx"));
134            let is_jsx = matches!(lang, Some("tsx" | "jsx"));
135            let src = SRC_ATTR_RE
136                .captures(attrs)
137                .and_then(|c| c.get(1))
138                .map(|m| m.as_str().to_string());
139            let is_setup = SETUP_ATTR_RE.is_match(attrs);
140            let is_context_module = CONTEXT_MODULE_ATTR_RE.is_match(attrs);
141            let generic_attr = VUE_GENERIC_ATTR_RE
142                .captures(attrs)
143                .or_else(|| SVELTE_GENERICS_ATTR_RE.captures(attrs))
144                .and_then(|cap| cap.get(1).or_else(|| cap.get(2)))
145                .map(|m| m.as_str().to_string())
146                .filter(|value| !value.trim().is_empty());
147            SfcScript {
148                body,
149                is_typescript,
150                is_jsx,
151                byte_offset,
152                src,
153                is_setup,
154                is_context_module,
155                generic_attr,
156            }
157        })
158        .collect()
159}
160
161/// An extracted `<style>` block from a Vue or Svelte SFC.
162pub struct SfcStyle {
163    /// The style body text (CSS / SCSS / Sass / Less / Stylus / PostCSS source).
164    pub body: String,
165    /// The `lang` attribute value (`scss`, `sass`, `less`, `stylus`, `postcss`, ...).
166    /// `None` for plain `<style>` (CSS).
167    pub lang: Option<String>,
168    /// External style source path from the `src` attribute (`<style src="./theme.scss">`).
169    pub src: Option<String>,
170}
171
172/// Extract all `<style>` blocks from a Vue/Svelte SFC source string.
173///
174/// Mirrors [`extract_sfc_scripts`]: filters blocks inside HTML comments and
175/// captures the `lang` and `src` attributes so the caller can route the body to
176/// the right preprocessor's import scanner (currently only CSS / SCSS / Sass) or
177/// seed the `src` reference as a side-effect import.
178pub fn extract_sfc_styles(source: &str) -> Vec<SfcStyle> {
179    let comment_ranges: Vec<(usize, usize)> = HTML_COMMENT_RE
180        .find_iter(source)
181        .map(|m| (m.start(), m.end()))
182        .collect();
183
184    STYLE_BLOCK_RE
185        .captures_iter(source)
186        .filter(|cap| {
187            let start = cap.get(0).map_or(0, |m| m.start());
188            !comment_ranges
189                .iter()
190                .any(|&(cs, ce)| start >= cs && start < ce)
191        })
192        .map(|cap| {
193            let attrs = cap.name("attrs").map_or("", |m| m.as_str());
194            let body = cap.name("body").map_or("", |m| m.as_str()).to_string();
195            let lang = LANG_ATTR_RE
196                .captures(attrs)
197                .and_then(|c| c.get(1))
198                .map(|m| m.as_str().to_string());
199            let src = SRC_ATTR_RE
200                .captures(attrs)
201                .and_then(|c| c.get(1))
202                .map(|m| m.as_str().to_string());
203            SfcStyle { body, lang, src }
204        })
205        .collect()
206}
207
208/// Check if a file path is a Vue or Svelte SFC (`.vue` or `.svelte`).
209#[must_use]
210pub fn is_sfc_file(path: &Path) -> bool {
211    path.extension()
212        .and_then(|e| e.to_str())
213        .is_some_and(|ext| ext == "vue" || ext == "svelte")
214}
215
216/// Parse an SFC file by extracting and combining all `<script>` and `<style>` blocks.
217pub(crate) fn parse_sfc_to_module(
218    file_id: FileId,
219    path: &Path,
220    source: &str,
221    content_hash: u64,
222    need_complexity: bool,
223) -> ModuleInfo {
224    let scripts = extract_sfc_scripts(source);
225    let styles = extract_sfc_styles(source);
226    let kind = sfc_kind(path);
227    let mut combined = empty_sfc_module(file_id, source, content_hash);
228    let mut template_visible_imports: FxHashSet<String> = FxHashSet::default();
229    let mut template_visible_bound_targets: FxHashMap<String, String> = FxHashMap::default();
230
231    for script in &scripts {
232        merge_script_into_module(
233            kind,
234            script,
235            &mut combined,
236            &mut template_visible_imports,
237            &mut template_visible_bound_targets,
238            need_complexity,
239        );
240    }
241
242    for style in &styles {
243        merge_style_into_module(style, &mut combined);
244    }
245
246    apply_template_usage(
247        kind,
248        source,
249        &template_visible_imports,
250        &template_visible_bound_targets,
251        &mut combined,
252    );
253    combined.unused_import_bindings.sort_unstable();
254    combined.unused_import_bindings.dedup();
255    combined.type_referenced_import_bindings.sort_unstable();
256    combined.type_referenced_import_bindings.dedup();
257    combined.value_referenced_import_bindings.sort_unstable();
258    combined.value_referenced_import_bindings.dedup();
259
260    combined
261}
262
263fn sfc_kind(path: &Path) -> SfcKind {
264    if path.extension().and_then(|ext| ext.to_str()) == Some("vue") {
265        SfcKind::Vue
266    } else {
267        SfcKind::Svelte
268    }
269}
270
271fn empty_sfc_module(file_id: FileId, source: &str, content_hash: u64) -> ModuleInfo {
272    // For SFC files, use string scanning for suppression comments since script block
273    // byte offsets don't correspond to the original file positions.
274    let parsed = crate::suppress::parse_suppressions_from_source(source);
275
276    ModuleInfo {
277        file_id,
278        exports: Vec::new(),
279        imports: Vec::new(),
280        re_exports: Vec::new(),
281        dynamic_imports: Vec::new(),
282        dynamic_import_patterns: Vec::new(),
283        require_calls: Vec::new(),
284        member_accesses: Vec::new(),
285        whole_object_uses: Vec::new(),
286        has_cjs_exports: false,
287        has_angular_component_template_url: false,
288        content_hash,
289        suppressions: parsed.suppressions,
290        unknown_suppression_kinds: parsed.unknown_kinds,
291        unused_import_bindings: Vec::new(),
292        type_referenced_import_bindings: Vec::new(),
293        value_referenced_import_bindings: Vec::new(),
294        line_offsets: compute_line_offsets(source),
295        complexity: Vec::new(),
296        flag_uses: Vec::new(),
297        class_heritage: vec![],
298        local_type_declarations: Vec::new(),
299        public_signature_type_references: Vec::new(),
300        namespace_object_aliases: Vec::new(),
301        iconify_prefixes: Vec::new(),
302    }
303}
304
305fn merge_script_into_module(
306    kind: SfcKind,
307    script: &SfcScript,
308    combined: &mut ModuleInfo,
309    template_visible_imports: &mut FxHashSet<String>,
310    template_visible_bound_targets: &mut FxHashMap<String, String>,
311    need_complexity: bool,
312) {
313    if let Some(src) = &script.src {
314        add_script_src_import(combined, src);
315    }
316
317    let allocator = Allocator::default();
318    let parser_return =
319        Parser::new(&allocator, &script.body, source_type_for_script(script)).parse();
320    let mut extractor = ModuleInfoExtractor::new();
321    extractor.visit_program(&parser_return.program);
322
323    // The script-tag `generic="..."` (Vue) / `generics="..."` (Svelte)
324    // constraint lives on the tag, not in the script body. Imports referenced
325    // only inside it would be classified as unused without this augmentation.
326    // Append a synthetic `type _<...> = unknown;` declaration so oxc_semantic
327    // sees those references and routes the bindings into `type_referenced`.
328    let augmented_body = build_generic_attr_probe_source(script);
329    // Vue/Svelte still credit template-visible imports via the post-hoc
330    // `apply_template_usage` retain pass below, so pass an empty skip-set
331    // here. (Folding the template scan in at this layer the way `.gts` /
332    // `.gjs` does is future work; see `crates/extract/src/parse.rs::
333    // collect_glimmer_template_into_extractor` for the target shape.)
334    let empty_template_used = rustc_hash::FxHashSet::default();
335    let binding_usage = if let Some(augmented) = augmented_body.as_deref() {
336        let augmented_return =
337            Parser::new(&allocator, augmented, source_type_for_script(script)).parse();
338        compute_import_binding_usage(
339            &augmented_return.program,
340            &extractor.imports,
341            &empty_template_used,
342        )
343    } else {
344        compute_import_binding_usage(
345            &parser_return.program,
346            &extractor.imports,
347            &empty_template_used,
348        )
349    };
350    combined
351        .unused_import_bindings
352        .extend(binding_usage.unused.iter().cloned());
353    combined
354        .type_referenced_import_bindings
355        .extend(binding_usage.type_referenced.iter().cloned());
356    combined
357        .value_referenced_import_bindings
358        .extend(binding_usage.value_referenced.iter().cloned());
359    if need_complexity {
360        combined.complexity.extend(translate_script_complexity(
361            script,
362            &parser_return.program,
363            &combined.line_offsets,
364        ));
365    }
366
367    if is_template_visible_script(kind, script) {
368        template_visible_imports.extend(
369            extractor
370                .imports
371                .iter()
372                .filter(|import| !import.local_name.is_empty())
373                .map(|import| import.local_name.clone()),
374        );
375        template_visible_bound_targets.extend(
376            extractor
377                .binding_target_names()
378                .iter()
379                .filter(|(local, _)| !local.starts_with("this."))
380                .map(|(local, target)| (local.clone(), target.clone())),
381        );
382    }
383
384    extractor.merge_into(combined);
385}
386
387fn translate_script_complexity(
388    script: &SfcScript,
389    program: &oxc_ast::ast::Program<'_>,
390    sfc_line_offsets: &[u32],
391) -> Vec<FunctionComplexity> {
392    let script_line_offsets = compute_line_offsets(&script.body);
393    let mut complexity = crate::complexity::compute_complexity(program, &script_line_offsets);
394    let (body_start_line, body_start_col) =
395        byte_offset_to_line_col(sfc_line_offsets, script.byte_offset as u32);
396
397    for function in &mut complexity {
398        function.line = body_start_line + function.line.saturating_sub(1);
399        if function.line == body_start_line {
400            function.col += body_start_col;
401        }
402    }
403
404    complexity
405}
406
407fn add_script_src_import(module: &mut ModuleInfo, source: &str) {
408    // Normalize bare filenames (e.g., `<script src="logic.ts">`) so the
409    // resolver treats them as file-relative references, not npm packages.
410    module.imports.push(ImportInfo {
411        source: normalize_asset_url(source),
412        imported_name: ImportedName::SideEffect,
413        local_name: String::new(),
414        is_type_only: false,
415        from_style: false,
416        span: Span::default(),
417        source_span: Span::default(),
418    });
419}
420
421/// `lang` attribute values whose body we know how to scan for `@import` /
422/// `@use` / `@forward` / `@plugin` directives. Plain `<style>` (no `lang`) is treated as
423/// CSS. `less`, `stylus`, and `postcss` bodies are NOT scanned because their
424/// import syntax differs (`@import (reference)` modifiers, etc.); their
425/// `<style src="...">` references are still seeded.
426fn style_lang_is_scss(lang: Option<&str>) -> bool {
427    matches!(lang, Some("scss" | "sass"))
428}
429
430fn style_lang_is_css_like(lang: Option<&str>) -> bool {
431    lang.is_none() || matches!(lang, Some("css"))
432}
433
434fn merge_style_into_module(style: &SfcStyle, combined: &mut ModuleInfo) {
435    // <style src="./theme.scss"> is symmetric to <script src="...">: seed the
436    // referenced file as a side-effect import. The resolver still applies SCSS
437    // partial / include-path / node_modules fallbacks because `from_style` is
438    // set on the import.
439    if let Some(src) = &style.src {
440        combined.imports.push(ImportInfo {
441            source: normalize_asset_url(src),
442            imported_name: ImportedName::SideEffect,
443            local_name: String::new(),
444            is_type_only: false,
445            from_style: true,
446            span: Span::default(),
447            source_span: Span::default(),
448        });
449    }
450
451    let lang = style.lang.as_deref();
452    let is_scss = style_lang_is_scss(lang);
453    let is_css_like = style_lang_is_css_like(lang);
454    if !is_scss && !is_css_like {
455        return;
456    }
457
458    for source in crate::css::extract_css_import_sources(&style.body, is_scss) {
459        combined.imports.push(ImportInfo {
460            source: source.normalized,
461            imported_name: if source.is_plugin {
462                ImportedName::Default
463            } else {
464                ImportedName::SideEffect
465            },
466            local_name: String::new(),
467            is_type_only: false,
468            from_style: true,
469            span: Span::default(),
470            source_span: Span::default(),
471        });
472    }
473}
474
475fn source_type_for_script(script: &SfcScript) -> SourceType {
476    match (script.is_typescript, script.is_jsx) {
477        (true, true) => SourceType::tsx(),
478        (true, false) => SourceType::ts(),
479        (false, true) => SourceType::jsx(),
480        (false, false) => SourceType::mjs(),
481    }
482}
483
484/// Build an augmented script body that pins the `generic="..."` constraint as
485/// a synthetic local type alias. The alias is unexported and uses a sentinel
486/// name so it can't collide with user code. Returns `None` when there is no
487/// generic attribute to pin (the common case), so callers fall back to the
488/// raw body without paying for a second parse.
489fn build_generic_attr_probe_source(script: &SfcScript) -> Option<String> {
490    let constraint = script.generic_attr.as_deref()?.trim();
491    if constraint.is_empty() {
492        return None;
493    }
494    Some(format!(
495        "{}\n;type __FALLOW_GENERIC_ATTR_PROBE<{}> = unknown;\n",
496        script.body, constraint,
497    ))
498}
499
500fn apply_template_usage(
501    kind: SfcKind,
502    source: &str,
503    template_visible_imports: &FxHashSet<String>,
504    template_visible_bound_targets: &FxHashMap<String, String>,
505    combined: &mut ModuleInfo,
506) {
507    if template_visible_imports.is_empty() && template_visible_bound_targets.is_empty() {
508        return;
509    }
510
511    let template_usage = collect_template_usage_with_bound_targets(
512        kind,
513        source,
514        template_visible_imports,
515        template_visible_bound_targets,
516    );
517    combined
518        .unused_import_bindings
519        .retain(|binding| !template_usage.used_bindings.contains(binding));
520    combined
521        .member_accesses
522        .extend(template_usage.member_accesses);
523    combined
524        .whole_object_uses
525        .extend(template_usage.whole_object_uses);
526}
527
528fn is_template_visible_script(kind: SfcKind, script: &SfcScript) -> bool {
529    match kind {
530        SfcKind::Vue => script.is_setup,
531        SfcKind::Svelte => !script.is_context_module,
532    }
533}
534
535// SFC tests exercise regex-based HTML string extraction — no unsafe code,
536// no Miri-specific value. Oxc parser tests are additionally ~1000x slower.
537#[cfg(all(test, not(miri)))]
538mod tests {
539    use super::*;
540
541    // ── is_sfc_file ──────────────────────────────────────────────
542
543    #[test]
544    fn is_sfc_file_vue() {
545        assert!(is_sfc_file(Path::new("App.vue")));
546    }
547
548    #[test]
549    fn is_sfc_file_svelte() {
550        assert!(is_sfc_file(Path::new("Counter.svelte")));
551    }
552
553    #[test]
554    fn is_sfc_file_rejects_ts() {
555        assert!(!is_sfc_file(Path::new("utils.ts")));
556    }
557
558    #[test]
559    fn is_sfc_file_rejects_jsx() {
560        assert!(!is_sfc_file(Path::new("App.jsx")));
561    }
562
563    #[test]
564    fn is_sfc_file_rejects_astro() {
565        assert!(!is_sfc_file(Path::new("Layout.astro")));
566    }
567
568    // ── extract_sfc_scripts: single script block ─────────────────
569
570    #[test]
571    fn single_plain_script() {
572        let scripts = extract_sfc_scripts("<script>const x = 1;</script>");
573        assert_eq!(scripts.len(), 1);
574        assert_eq!(scripts[0].body, "const x = 1;");
575        assert!(!scripts[0].is_typescript);
576        assert!(!scripts[0].is_jsx);
577        assert!(scripts[0].src.is_none());
578    }
579
580    #[test]
581    fn single_ts_script() {
582        let scripts = extract_sfc_scripts(r#"<script lang="ts">const x: number = 1;</script>"#);
583        assert_eq!(scripts.len(), 1);
584        assert!(scripts[0].is_typescript);
585        assert!(!scripts[0].is_jsx);
586    }
587
588    #[test]
589    fn single_tsx_script() {
590        let scripts = extract_sfc_scripts(r#"<script lang="tsx">const el = <div />;</script>"#);
591        assert_eq!(scripts.len(), 1);
592        assert!(scripts[0].is_typescript);
593        assert!(scripts[0].is_jsx);
594    }
595
596    #[test]
597    fn single_jsx_script() {
598        let scripts = extract_sfc_scripts(r#"<script lang="jsx">const el = <div />;</script>"#);
599        assert_eq!(scripts.len(), 1);
600        assert!(!scripts[0].is_typescript);
601        assert!(scripts[0].is_jsx);
602    }
603
604    // ── Multiple script blocks ───────────────────────────────────
605
606    #[test]
607    fn two_script_blocks() {
608        let source = r#"
609<script lang="ts">
610export default {};
611</script>
612<script setup lang="ts">
613const count = 0;
614</script>
615"#;
616        let scripts = extract_sfc_scripts(source);
617        assert_eq!(scripts.len(), 2);
618        assert!(scripts[0].body.contains("export default"));
619        assert!(scripts[1].body.contains("count"));
620    }
621
622    // ── <script setup> ───────────────────────────────────────────
623
624    #[test]
625    fn script_setup_extracted() {
626        let scripts =
627            extract_sfc_scripts(r#"<script setup lang="ts">import { ref } from 'vue';</script>"#);
628        assert_eq!(scripts.len(), 1);
629        assert!(scripts[0].body.contains("import"));
630        assert!(scripts[0].is_typescript);
631    }
632
633    // ── <script src="..."> external script ───────────────────────
634
635    #[test]
636    fn script_src_detected() {
637        let scripts = extract_sfc_scripts(r#"<script src="./component.ts" lang="ts"></script>"#);
638        assert_eq!(scripts.len(), 1);
639        assert_eq!(scripts[0].src.as_deref(), Some("./component.ts"));
640    }
641
642    #[test]
643    fn data_src_not_treated_as_src() {
644        let scripts =
645            extract_sfc_scripts(r#"<script lang="ts" data-src="./nope.ts">const x = 1;</script>"#);
646        assert_eq!(scripts.len(), 1);
647        assert!(scripts[0].src.is_none());
648    }
649
650    // ── HTML comment filtering ───────────────────────────────────
651
652    #[test]
653    fn script_inside_html_comment_filtered() {
654        let source = r#"
655<!-- <script lang="ts">import { bad } from 'bad';</script> -->
656<script lang="ts">import { good } from 'good';</script>
657"#;
658        let scripts = extract_sfc_scripts(source);
659        assert_eq!(scripts.len(), 1);
660        assert!(scripts[0].body.contains("good"));
661    }
662
663    #[test]
664    fn spanning_comment_filters_script() {
665        let source = r#"
666<!-- disabled:
667<script lang="ts">import { bad } from 'bad';</script>
668-->
669<script lang="ts">const ok = true;</script>
670"#;
671        let scripts = extract_sfc_scripts(source);
672        assert_eq!(scripts.len(), 1);
673        assert!(scripts[0].body.contains("ok"));
674    }
675
676    #[test]
677    fn string_containing_comment_markers_not_corrupted() {
678        // A string in the script body containing <!-- should not cause filtering issues
679        let source = r#"
680<script setup lang="ts">
681const marker = "<!-- not a comment -->";
682import { ref } from 'vue';
683</script>
684"#;
685        let scripts = extract_sfc_scripts(source);
686        assert_eq!(scripts.len(), 1);
687        assert!(scripts[0].body.contains("import"));
688    }
689
690    // ── Generic attributes with > in quoted values ───────────────
691
692    #[test]
693    fn generic_attr_with_angle_bracket() {
694        let source =
695            r#"<script setup lang="ts" generic="T extends Foo<Bar>">const x = 1;</script>"#;
696        let scripts = extract_sfc_scripts(source);
697        assert_eq!(scripts.len(), 1);
698        assert_eq!(scripts[0].body, "const x = 1;");
699    }
700
701    #[test]
702    fn nested_generic_attr() {
703        let source = r#"<script setup lang="ts" generic="T extends Map<string, Set<number>>">const x = 1;</script>"#;
704        let scripts = extract_sfc_scripts(source);
705        assert_eq!(scripts.len(), 1);
706        assert_eq!(scripts[0].body, "const x = 1;");
707    }
708
709    // ── lang attribute with single quotes ────────────────────────
710
711    #[test]
712    fn lang_single_quoted() {
713        let scripts = extract_sfc_scripts("<script lang='ts'>const x = 1;</script>");
714        assert_eq!(scripts.len(), 1);
715        assert!(scripts[0].is_typescript);
716    }
717
718    // ── Case-insensitive matching ────────────────────────────────
719
720    #[test]
721    fn uppercase_script_tag() {
722        let scripts = extract_sfc_scripts(r#"<SCRIPT lang="ts">const x = 1;</SCRIPT>"#);
723        assert_eq!(scripts.len(), 1);
724        assert!(scripts[0].is_typescript);
725    }
726
727    // ── Edge cases ───────────────────────────────────────────────
728
729    #[test]
730    fn no_script_block() {
731        let scripts = extract_sfc_scripts("<template><div>Hello</div></template>");
732        assert!(scripts.is_empty());
733    }
734
735    #[test]
736    fn empty_script_body() {
737        let scripts = extract_sfc_scripts(r#"<script lang="ts"></script>"#);
738        assert_eq!(scripts.len(), 1);
739        assert!(scripts[0].body.is_empty());
740    }
741
742    #[test]
743    fn whitespace_only_script() {
744        let scripts = extract_sfc_scripts("<script lang=\"ts\">\n  \n</script>");
745        assert_eq!(scripts.len(), 1);
746        assert!(scripts[0].body.trim().is_empty());
747    }
748
749    #[test]
750    fn byte_offset_is_set() {
751        let source = r#"<template><div/></template><script lang="ts">code</script>"#;
752        let scripts = extract_sfc_scripts(source);
753        assert_eq!(scripts.len(), 1);
754        // The byte_offset should point to where "code" starts in the source
755        let offset = scripts[0].byte_offset;
756        assert_eq!(&source[offset..offset + 4], "code");
757    }
758
759    #[test]
760    fn script_with_extra_attributes() {
761        let scripts = extract_sfc_scripts(
762            r#"<script lang="ts" id="app" type="module" data-custom="val">const x = 1;</script>"#,
763        );
764        assert_eq!(scripts.len(), 1);
765        assert!(scripts[0].is_typescript);
766        assert!(scripts[0].src.is_none());
767    }
768
769    // ── Full parse tests (Oxc parser ~1000x slower under Miri) ──
770
771    #[test]
772    fn multiple_script_blocks_exports_combined() {
773        let source = r#"
774<script lang="ts">
775export const version = '1.0';
776</script>
777<script setup lang="ts">
778import { ref } from 'vue';
779const count = ref(0);
780</script>
781"#;
782        let info = parse_sfc_to_module(FileId(0), Path::new("Dual.vue"), source, 0, false);
783        // The non-setup block exports `version`
784        assert!(
785            info.exports
786                .iter()
787                .any(|e| matches!(&e.name, crate::ExportName::Named(n) if n == "version")),
788            "export from <script> block should be extracted"
789        );
790        // The setup block imports `ref` from 'vue'
791        assert!(
792            info.imports.iter().any(|i| i.source == "vue"),
793            "import from <script setup> block should be extracted"
794        );
795    }
796
797    // ── lang="tsx" detection ────────────────────────────────────
798
799    #[test]
800    fn lang_tsx_detected_as_typescript_jsx() {
801        let scripts =
802            extract_sfc_scripts(r#"<script lang="tsx">const el = <div>{x}</div>;</script>"#);
803        assert_eq!(scripts.len(), 1);
804        assert!(scripts[0].is_typescript, "lang=tsx should be typescript");
805        assert!(scripts[0].is_jsx, "lang=tsx should be jsx");
806    }
807
808    // ── HTML comment filtering of script blocks ─────────────────
809
810    #[test]
811    fn multiline_html_comment_filters_all_script_blocks_inside() {
812        let source = r#"
813<!--
814  This whole section is disabled:
815  <script lang="ts">import { bad1 } from 'bad1';</script>
816  <script lang="ts">import { bad2 } from 'bad2';</script>
817-->
818<script lang="ts">import { good } from 'good';</script>
819"#;
820        let scripts = extract_sfc_scripts(source);
821        assert_eq!(scripts.len(), 1);
822        assert!(scripts[0].body.contains("good"));
823    }
824
825    // ── <script src="..."> generates side-effect import ─────────
826
827    #[test]
828    fn script_src_generates_side_effect_import() {
829        let info = parse_sfc_to_module(
830            FileId(0),
831            Path::new("External.vue"),
832            r#"<script src="./external-logic.ts" lang="ts"></script>"#,
833            0,
834            false,
835        );
836        assert!(
837            info.imports
838                .iter()
839                .any(|i| i.source == "./external-logic.ts"
840                    && matches!(i.imported_name, ImportedName::SideEffect)),
841            "script src should generate a side-effect import"
842        );
843    }
844
845    // ── Additional coverage ─────────────────────────────────────
846
847    #[test]
848    fn parse_sfc_no_script_returns_empty_module() {
849        let info = parse_sfc_to_module(
850            FileId(0),
851            Path::new("Empty.vue"),
852            "<template><div>Hello</div></template>",
853            42,
854            false,
855        );
856        assert!(info.imports.is_empty());
857        assert!(info.exports.is_empty());
858        assert_eq!(info.content_hash, 42);
859        assert_eq!(info.file_id, FileId(0));
860    }
861
862    #[test]
863    fn parse_sfc_has_line_offsets() {
864        let info = parse_sfc_to_module(
865            FileId(0),
866            Path::new("LineOffsets.vue"),
867            r#"<script lang="ts">const x = 1;</script>"#,
868            0,
869            false,
870        );
871        assert!(!info.line_offsets.is_empty());
872    }
873
874    #[test]
875    fn parse_sfc_has_suppressions() {
876        let info = parse_sfc_to_module(
877            FileId(0),
878            Path::new("Suppressions.vue"),
879            r#"<script lang="ts">
880// fallow-ignore-file
881export const foo = 1;
882</script>"#,
883            0,
884            false,
885        );
886        assert!(!info.suppressions.is_empty());
887    }
888
889    #[test]
890    fn source_type_jsx_detection() {
891        let scripts = extract_sfc_scripts(r#"<script lang="jsx">const el = <div />;</script>"#);
892        assert_eq!(scripts.len(), 1);
893        assert!(!scripts[0].is_typescript);
894        assert!(scripts[0].is_jsx);
895    }
896
897    #[test]
898    fn source_type_plain_js_detection() {
899        let scripts = extract_sfc_scripts("<script>const x = 1;</script>");
900        assert_eq!(scripts.len(), 1);
901        assert!(!scripts[0].is_typescript);
902        assert!(!scripts[0].is_jsx);
903    }
904
905    #[test]
906    fn is_sfc_file_rejects_no_extension() {
907        assert!(!is_sfc_file(Path::new("Makefile")));
908    }
909
910    #[test]
911    fn is_sfc_file_rejects_mdx() {
912        assert!(!is_sfc_file(Path::new("post.mdx")));
913    }
914
915    #[test]
916    fn is_sfc_file_rejects_css() {
917        assert!(!is_sfc_file(Path::new("styles.css")));
918    }
919
920    #[test]
921    fn multiple_script_blocks_both_have_offsets() {
922        let source = r#"<script lang="ts">const a = 1;</script>
923<script setup lang="ts">const b = 2;</script>"#;
924        let scripts = extract_sfc_scripts(source);
925        assert_eq!(scripts.len(), 2);
926        // Both scripts should have valid byte offsets
927        let offset0 = scripts[0].byte_offset;
928        let offset1 = scripts[1].byte_offset;
929        assert_eq!(
930            &source[offset0..offset0 + "const a = 1;".len()],
931            "const a = 1;"
932        );
933        assert_eq!(
934            &source[offset1..offset1 + "const b = 2;".len()],
935            "const b = 2;"
936        );
937    }
938
939    #[test]
940    fn script_with_src_and_lang() {
941        // src + lang should both be detected
942        let scripts = extract_sfc_scripts(r#"<script src="./logic.ts" lang="tsx"></script>"#);
943        assert_eq!(scripts.len(), 1);
944        assert_eq!(scripts[0].src.as_deref(), Some("./logic.ts"));
945        assert!(scripts[0].is_typescript);
946        assert!(scripts[0].is_jsx);
947    }
948
949    // ── extract_sfc_styles (issue #195 Case B) ──
950
951    #[test]
952    fn extract_style_block_lang_scss() {
953        let source = r#"<template/><style lang="scss">@import 'Foo';</style>"#;
954        let styles = extract_sfc_styles(source);
955        assert_eq!(styles.len(), 1);
956        assert_eq!(styles[0].lang.as_deref(), Some("scss"));
957        assert!(styles[0].body.contains("@import"));
958        assert!(styles[0].src.is_none());
959    }
960
961    #[test]
962    fn extract_style_block_with_src() {
963        let source = r#"<style src="./theme.scss" lang="scss"></style>"#;
964        let styles = extract_sfc_styles(source);
965        assert_eq!(styles.len(), 1);
966        assert_eq!(styles[0].src.as_deref(), Some("./theme.scss"));
967        assert_eq!(styles[0].lang.as_deref(), Some("scss"));
968    }
969
970    #[test]
971    fn extract_style_block_plain_no_lang() {
972        let source = r"<style>.foo { color: red; }</style>";
973        let styles = extract_sfc_styles(source);
974        assert_eq!(styles.len(), 1);
975        assert!(styles[0].lang.is_none());
976    }
977
978    #[test]
979    fn extract_multiple_style_blocks() {
980        let source = r#"<style lang="scss">@import 'a';</style>
981<style scoped lang="scss">@import 'b';</style>"#;
982        let styles = extract_sfc_styles(source);
983        assert_eq!(styles.len(), 2);
984    }
985
986    #[test]
987    fn style_block_inside_html_comment_filtered() {
988        let source = r#"<!-- <style lang="scss">@import 'bad';</style> -->
989<style lang="scss">@import 'good';</style>"#;
990        let styles = extract_sfc_styles(source);
991        assert_eq!(styles.len(), 1);
992        assert!(styles[0].body.contains("good"));
993    }
994
995    #[test]
996    fn parse_sfc_extracts_style_imports_with_from_style_flag() {
997        let info = parse_sfc_to_module(
998            FileId(0),
999            Path::new("Foo.vue"),
1000            r#"<template/><style lang="scss">@import 'Foo';</style>"#,
1001            0,
1002            false,
1003        );
1004        let style_import = info
1005            .imports
1006            .iter()
1007            .find(|i| i.source == "./Foo")
1008            .expect("scss @import 'Foo' should be normalized to ./Foo");
1009        assert!(
1010            style_import.from_style,
1011            "imports from <style> blocks must carry from_style=true so the resolver \
1012             enables SCSS partial fallback for the SFC importer"
1013        );
1014        assert!(matches!(
1015            style_import.imported_name,
1016            ImportedName::SideEffect
1017        ));
1018    }
1019
1020    #[test]
1021    fn parse_sfc_extracts_style_plugin_as_default_import() {
1022        let info = parse_sfc_to_module(
1023            FileId(0),
1024            Path::new("Foo.vue"),
1025            r#"<template/><style>@plugin "./tailwind-plugin.js";</style>"#,
1026            0,
1027            false,
1028        );
1029        let plugin_import = info
1030            .imports
1031            .iter()
1032            .find(|i| i.source == "./tailwind-plugin.js")
1033            .expect("style @plugin should create an import");
1034        assert!(plugin_import.from_style);
1035        assert!(matches!(plugin_import.imported_name, ImportedName::Default));
1036    }
1037
1038    #[test]
1039    fn parse_sfc_extracts_style_src_with_from_style_flag() {
1040        let info = parse_sfc_to_module(
1041            FileId(0),
1042            Path::new("Bar.vue"),
1043            r#"<style src="./Bar.scss" lang="scss"></style>"#,
1044            0,
1045            false,
1046        );
1047        let style_src = info
1048            .imports
1049            .iter()
1050            .find(|i| i.source == "./Bar.scss")
1051            .expect("<style src=\"./Bar.scss\"> should produce a side-effect import");
1052        assert!(style_src.from_style);
1053    }
1054
1055    #[test]
1056    fn parse_sfc_skips_unsupported_style_lang_body_but_keeps_src() {
1057        // <style lang="postcss"> body is NOT scanned (custom directives); src is still seeded.
1058        let info = parse_sfc_to_module(
1059            FileId(0),
1060            Path::new("Baz.vue"),
1061            r#"<style lang="postcss" src="./Baz.pcss">@custom-rule "skipped";</style>"#,
1062            0,
1063            false,
1064        );
1065        assert!(
1066            info.imports.iter().any(|i| i.source == "./Baz.pcss"),
1067            "src reference should still be seeded for unsupported lang"
1068        );
1069        assert!(
1070            !info.imports.iter().any(|i| i.source.contains("skipped")),
1071            "postcss body should not be scanned for @import directives"
1072        );
1073    }
1074}
fallow_extract/sfc.rs

fallow_extract/
sfc.rs
