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 suppressions = 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,
290        unused_import_bindings: Vec::new(),
291        type_referenced_import_bindings: Vec::new(),
292        value_referenced_import_bindings: Vec::new(),
293        line_offsets: compute_line_offsets(source),
294        complexity: Vec::new(),
295        flag_uses: Vec::new(),
296        class_heritage: vec![],
297        local_type_declarations: Vec::new(),
298        public_signature_type_references: Vec::new(),
299        namespace_object_aliases: Vec::new(),
300    }
301}
302
303fn merge_script_into_module(
304    kind: SfcKind,
305    script: &SfcScript,
306    combined: &mut ModuleInfo,
307    template_visible_imports: &mut FxHashSet<String>,
308    template_visible_bound_targets: &mut FxHashMap<String, String>,
309    need_complexity: bool,
310) {
311    if let Some(src) = &script.src {
312        add_script_src_import(combined, src);
313    }
314
315    let allocator = Allocator::default();
316    let parser_return =
317        Parser::new(&allocator, &script.body, source_type_for_script(script)).parse();
318    let mut extractor = ModuleInfoExtractor::new();
319    extractor.visit_program(&parser_return.program);
320
321    // The script-tag `generic="..."` (Vue) / `generics="..."` (Svelte)
322    // constraint lives on the tag, not in the script body. Imports referenced
323    // only inside it would be classified as unused without this augmentation.
324    // Append a synthetic `type _<...> = unknown;` declaration so oxc_semantic
325    // sees those references and routes the bindings into `type_referenced`.
326    let augmented_body = build_generic_attr_probe_source(script);
327    let binding_usage = if let Some(augmented) = augmented_body.as_deref() {
328        let augmented_return =
329            Parser::new(&allocator, augmented, source_type_for_script(script)).parse();
330        compute_import_binding_usage(&augmented_return.program, &extractor.imports)
331    } else {
332        compute_import_binding_usage(&parser_return.program, &extractor.imports)
333    };
334    combined
335        .unused_import_bindings
336        .extend(binding_usage.unused.iter().cloned());
337    combined
338        .type_referenced_import_bindings
339        .extend(binding_usage.type_referenced.iter().cloned());
340    combined
341        .value_referenced_import_bindings
342        .extend(binding_usage.value_referenced.iter().cloned());
343    if need_complexity {
344        combined.complexity.extend(translate_script_complexity(
345            script,
346            &parser_return.program,
347            &combined.line_offsets,
348        ));
349    }
350
351    if is_template_visible_script(kind, script) {
352        template_visible_imports.extend(
353            extractor
354                .imports
355                .iter()
356                .filter(|import| !import.local_name.is_empty())
357                .map(|import| import.local_name.clone()),
358        );
359        template_visible_bound_targets.extend(
360            extractor
361                .binding_target_names()
362                .iter()
363                .filter(|(local, _)| !local.starts_with("this."))
364                .map(|(local, target)| (local.clone(), target.clone())),
365        );
366    }
367
368    extractor.merge_into(combined);
369}
370
371fn translate_script_complexity(
372    script: &SfcScript,
373    program: &oxc_ast::ast::Program<'_>,
374    sfc_line_offsets: &[u32],
375) -> Vec<FunctionComplexity> {
376    let script_line_offsets = compute_line_offsets(&script.body);
377    let mut complexity = crate::complexity::compute_complexity(program, &script_line_offsets);
378    let (body_start_line, body_start_col) =
379        byte_offset_to_line_col(sfc_line_offsets, script.byte_offset as u32);
380
381    for function in &mut complexity {
382        function.line = body_start_line + function.line.saturating_sub(1);
383        if function.line == body_start_line {
384            function.col += body_start_col;
385        }
386    }
387
388    complexity
389}
390
391fn add_script_src_import(module: &mut ModuleInfo, source: &str) {
392    // Normalize bare filenames (e.g., `<script src="logic.ts">`) so the
393    // resolver treats them as file-relative references, not npm packages.
394    module.imports.push(ImportInfo {
395        source: normalize_asset_url(source),
396        imported_name: ImportedName::SideEffect,
397        local_name: String::new(),
398        is_type_only: false,
399        from_style: false,
400        span: Span::default(),
401        source_span: Span::default(),
402    });
403}
404
405/// `lang` attribute values whose body we know how to scan for `@import` /
406/// `@use` / `@forward` / `@plugin` directives. Plain `<style>` (no `lang`) is treated as
407/// CSS. `less`, `stylus`, and `postcss` bodies are NOT scanned because their
408/// import syntax differs (`@import (reference)` modifiers, etc.); their
409/// `<style src="...">` references are still seeded.
410fn style_lang_is_scss(lang: Option<&str>) -> bool {
411    matches!(lang, Some("scss" | "sass"))
412}
413
414fn style_lang_is_css_like(lang: Option<&str>) -> bool {
415    lang.is_none() || matches!(lang, Some("css"))
416}
417
418fn merge_style_into_module(style: &SfcStyle, combined: &mut ModuleInfo) {
419    // <style src="./theme.scss"> is symmetric to <script src="...">: seed the
420    // referenced file as a side-effect import. The resolver still applies SCSS
421    // partial / include-path / node_modules fallbacks because `from_style` is
422    // set on the import.
423    if let Some(src) = &style.src {
424        combined.imports.push(ImportInfo {
425            source: normalize_asset_url(src),
426            imported_name: ImportedName::SideEffect,
427            local_name: String::new(),
428            is_type_only: false,
429            from_style: true,
430            span: Span::default(),
431            source_span: Span::default(),
432        });
433    }
434
435    let lang = style.lang.as_deref();
436    let is_scss = style_lang_is_scss(lang);
437    let is_css_like = style_lang_is_css_like(lang);
438    if !is_scss && !is_css_like {
439        return;
440    }
441
442    for source in crate::css::extract_css_import_sources(&style.body, is_scss) {
443        combined.imports.push(ImportInfo {
444            source: source.normalized,
445            imported_name: if source.is_plugin {
446                ImportedName::Default
447            } else {
448                ImportedName::SideEffect
449            },
450            local_name: String::new(),
451            is_type_only: false,
452            from_style: true,
453            span: Span::default(),
454            source_span: Span::default(),
455        });
456    }
457}
458
459fn source_type_for_script(script: &SfcScript) -> SourceType {
460    match (script.is_typescript, script.is_jsx) {
461        (true, true) => SourceType::tsx(),
462        (true, false) => SourceType::ts(),
463        (false, true) => SourceType::jsx(),
464        (false, false) => SourceType::mjs(),
465    }
466}
467
468/// Build an augmented script body that pins the `generic="..."` constraint as
469/// a synthetic local type alias. The alias is unexported and uses a sentinel
470/// name so it can't collide with user code. Returns `None` when there is no
471/// generic attribute to pin (the common case), so callers fall back to the
472/// raw body without paying for a second parse.
473fn build_generic_attr_probe_source(script: &SfcScript) -> Option<String> {
474    let constraint = script.generic_attr.as_deref()?.trim();
475    if constraint.is_empty() {
476        return None;
477    }
478    Some(format!(
479        "{}\n;type __FALLOW_GENERIC_ATTR_PROBE<{}> = unknown;\n",
480        script.body, constraint,
481    ))
482}
483
484fn apply_template_usage(
485    kind: SfcKind,
486    source: &str,
487    template_visible_imports: &FxHashSet<String>,
488    template_visible_bound_targets: &FxHashMap<String, String>,
489    combined: &mut ModuleInfo,
490) {
491    if template_visible_imports.is_empty() && template_visible_bound_targets.is_empty() {
492        return;
493    }
494
495    let template_usage = collect_template_usage_with_bound_targets(
496        kind,
497        source,
498        template_visible_imports,
499        template_visible_bound_targets,
500    );
501    combined
502        .unused_import_bindings
503        .retain(|binding| !template_usage.used_bindings.contains(binding));
504    combined
505        .member_accesses
506        .extend(template_usage.member_accesses);
507    combined
508        .whole_object_uses
509        .extend(template_usage.whole_object_uses);
510}
511
512fn is_template_visible_script(kind: SfcKind, script: &SfcScript) -> bool {
513    match kind {
514        SfcKind::Vue => script.is_setup,
515        SfcKind::Svelte => !script.is_context_module,
516    }
517}
518
519// SFC tests exercise regex-based HTML string extraction — no unsafe code,
520// no Miri-specific value. Oxc parser tests are additionally ~1000x slower.
521#[cfg(all(test, not(miri)))]
522mod tests {
523    use super::*;
524
525    // ── is_sfc_file ──────────────────────────────────────────────
526
527    #[test]
528    fn is_sfc_file_vue() {
529        assert!(is_sfc_file(Path::new("App.vue")));
530    }
531
532    #[test]
533    fn is_sfc_file_svelte() {
534        assert!(is_sfc_file(Path::new("Counter.svelte")));
535    }
536
537    #[test]
538    fn is_sfc_file_rejects_ts() {
539        assert!(!is_sfc_file(Path::new("utils.ts")));
540    }
541
542    #[test]
543    fn is_sfc_file_rejects_jsx() {
544        assert!(!is_sfc_file(Path::new("App.jsx")));
545    }
546
547    #[test]
548    fn is_sfc_file_rejects_astro() {
549        assert!(!is_sfc_file(Path::new("Layout.astro")));
550    }
551
552    // ── extract_sfc_scripts: single script block ─────────────────
553
554    #[test]
555    fn single_plain_script() {
556        let scripts = extract_sfc_scripts("<script>const x = 1;</script>");
557        assert_eq!(scripts.len(), 1);
558        assert_eq!(scripts[0].body, "const x = 1;");
559        assert!(!scripts[0].is_typescript);
560        assert!(!scripts[0].is_jsx);
561        assert!(scripts[0].src.is_none());
562    }
563
564    #[test]
565    fn single_ts_script() {
566        let scripts = extract_sfc_scripts(r#"<script lang="ts">const x: number = 1;</script>"#);
567        assert_eq!(scripts.len(), 1);
568        assert!(scripts[0].is_typescript);
569        assert!(!scripts[0].is_jsx);
570    }
571
572    #[test]
573    fn single_tsx_script() {
574        let scripts = extract_sfc_scripts(r#"<script lang="tsx">const el = <div />;</script>"#);
575        assert_eq!(scripts.len(), 1);
576        assert!(scripts[0].is_typescript);
577        assert!(scripts[0].is_jsx);
578    }
579
580    #[test]
581    fn single_jsx_script() {
582        let scripts = extract_sfc_scripts(r#"<script lang="jsx">const el = <div />;</script>"#);
583        assert_eq!(scripts.len(), 1);
584        assert!(!scripts[0].is_typescript);
585        assert!(scripts[0].is_jsx);
586    }
587
588    // ── Multiple script blocks ───────────────────────────────────
589
590    #[test]
591    fn two_script_blocks() {
592        let source = r#"
593<script lang="ts">
594export default {};
595</script>
596<script setup lang="ts">
597const count = 0;
598</script>
599"#;
600        let scripts = extract_sfc_scripts(source);
601        assert_eq!(scripts.len(), 2);
602        assert!(scripts[0].body.contains("export default"));
603        assert!(scripts[1].body.contains("count"));
604    }
605
606    // ── <script setup> ───────────────────────────────────────────
607
608    #[test]
609    fn script_setup_extracted() {
610        let scripts =
611            extract_sfc_scripts(r#"<script setup lang="ts">import { ref } from 'vue';</script>"#);
612        assert_eq!(scripts.len(), 1);
613        assert!(scripts[0].body.contains("import"));
614        assert!(scripts[0].is_typescript);
615    }
616
617    // ── <script src="..."> external script ───────────────────────
618
619    #[test]
620    fn script_src_detected() {
621        let scripts = extract_sfc_scripts(r#"<script src="./component.ts" lang="ts"></script>"#);
622        assert_eq!(scripts.len(), 1);
623        assert_eq!(scripts[0].src.as_deref(), Some("./component.ts"));
624    }
625
626    #[test]
627    fn data_src_not_treated_as_src() {
628        let scripts =
629            extract_sfc_scripts(r#"<script lang="ts" data-src="./nope.ts">const x = 1;</script>"#);
630        assert_eq!(scripts.len(), 1);
631        assert!(scripts[0].src.is_none());
632    }
633
634    // ── HTML comment filtering ───────────────────────────────────
635
636    #[test]
637    fn script_inside_html_comment_filtered() {
638        let source = r#"
639<!-- <script lang="ts">import { bad } from 'bad';</script> -->
640<script lang="ts">import { good } from 'good';</script>
641"#;
642        let scripts = extract_sfc_scripts(source);
643        assert_eq!(scripts.len(), 1);
644        assert!(scripts[0].body.contains("good"));
645    }
646
647    #[test]
648    fn spanning_comment_filters_script() {
649        let source = r#"
650<!-- disabled:
651<script lang="ts">import { bad } from 'bad';</script>
652-->
653<script lang="ts">const ok = true;</script>
654"#;
655        let scripts = extract_sfc_scripts(source);
656        assert_eq!(scripts.len(), 1);
657        assert!(scripts[0].body.contains("ok"));
658    }
659
660    #[test]
661    fn string_containing_comment_markers_not_corrupted() {
662        // A string in the script body containing <!-- should not cause filtering issues
663        let source = r#"
664<script setup lang="ts">
665const marker = "<!-- not a comment -->";
666import { ref } from 'vue';
667</script>
668"#;
669        let scripts = extract_sfc_scripts(source);
670        assert_eq!(scripts.len(), 1);
671        assert!(scripts[0].body.contains("import"));
672    }
673
674    // ── Generic attributes with > in quoted values ───────────────
675
676    #[test]
677    fn generic_attr_with_angle_bracket() {
678        let source =
679            r#"<script setup lang="ts" generic="T extends Foo<Bar>">const x = 1;</script>"#;
680        let scripts = extract_sfc_scripts(source);
681        assert_eq!(scripts.len(), 1);
682        assert_eq!(scripts[0].body, "const x = 1;");
683    }
684
685    #[test]
686    fn nested_generic_attr() {
687        let source = r#"<script setup lang="ts" generic="T extends Map<string, Set<number>>">const x = 1;</script>"#;
688        let scripts = extract_sfc_scripts(source);
689        assert_eq!(scripts.len(), 1);
690        assert_eq!(scripts[0].body, "const x = 1;");
691    }
692
693    // ── lang attribute with single quotes ────────────────────────
694
695    #[test]
696    fn lang_single_quoted() {
697        let scripts = extract_sfc_scripts("<script lang='ts'>const x = 1;</script>");
698        assert_eq!(scripts.len(), 1);
699        assert!(scripts[0].is_typescript);
700    }
701
702    // ── Case-insensitive matching ────────────────────────────────
703
704    #[test]
705    fn uppercase_script_tag() {
706        let scripts = extract_sfc_scripts(r#"<SCRIPT lang="ts">const x = 1;</SCRIPT>"#);
707        assert_eq!(scripts.len(), 1);
708        assert!(scripts[0].is_typescript);
709    }
710
711    // ── Edge cases ───────────────────────────────────────────────
712
713    #[test]
714    fn no_script_block() {
715        let scripts = extract_sfc_scripts("<template><div>Hello</div></template>");
716        assert!(scripts.is_empty());
717    }
718
719    #[test]
720    fn empty_script_body() {
721        let scripts = extract_sfc_scripts(r#"<script lang="ts"></script>"#);
722        assert_eq!(scripts.len(), 1);
723        assert!(scripts[0].body.is_empty());
724    }
725
726    #[test]
727    fn whitespace_only_script() {
728        let scripts = extract_sfc_scripts("<script lang=\"ts\">\n  \n</script>");
729        assert_eq!(scripts.len(), 1);
730        assert!(scripts[0].body.trim().is_empty());
731    }
732
733    #[test]
734    fn byte_offset_is_set() {
735        let source = r#"<template><div/></template><script lang="ts">code</script>"#;
736        let scripts = extract_sfc_scripts(source);
737        assert_eq!(scripts.len(), 1);
738        // The byte_offset should point to where "code" starts in the source
739        let offset = scripts[0].byte_offset;
740        assert_eq!(&source[offset..offset + 4], "code");
741    }
742
743    #[test]
744    fn script_with_extra_attributes() {
745        let scripts = extract_sfc_scripts(
746            r#"<script lang="ts" id="app" type="module" data-custom="val">const x = 1;</script>"#,
747        );
748        assert_eq!(scripts.len(), 1);
749        assert!(scripts[0].is_typescript);
750        assert!(scripts[0].src.is_none());
751    }
752
753    // ── Full parse tests (Oxc parser ~1000x slower under Miri) ──
754
755    #[test]
756    fn multiple_script_blocks_exports_combined() {
757        let source = r#"
758<script lang="ts">
759export const version = '1.0';
760</script>
761<script setup lang="ts">
762import { ref } from 'vue';
763const count = ref(0);
764</script>
765"#;
766        let info = parse_sfc_to_module(FileId(0), Path::new("Dual.vue"), source, 0, false);
767        // The non-setup block exports `version`
768        assert!(
769            info.exports
770                .iter()
771                .any(|e| matches!(&e.name, crate::ExportName::Named(n) if n == "version")),
772            "export from <script> block should be extracted"
773        );
774        // The setup block imports `ref` from 'vue'
775        assert!(
776            info.imports.iter().any(|i| i.source == "vue"),
777            "import from <script setup> block should be extracted"
778        );
779    }
780
781    // ── lang="tsx" detection ────────────────────────────────────
782
783    #[test]
784    fn lang_tsx_detected_as_typescript_jsx() {
785        let scripts =
786            extract_sfc_scripts(r#"<script lang="tsx">const el = <div>{x}</div>;</script>"#);
787        assert_eq!(scripts.len(), 1);
788        assert!(scripts[0].is_typescript, "lang=tsx should be typescript");
789        assert!(scripts[0].is_jsx, "lang=tsx should be jsx");
790    }
791
792    // ── HTML comment filtering of script blocks ─────────────────
793
794    #[test]
795    fn multiline_html_comment_filters_all_script_blocks_inside() {
796        let source = r#"
797<!--
798  This whole section is disabled:
799  <script lang="ts">import { bad1 } from 'bad1';</script>
800  <script lang="ts">import { bad2 } from 'bad2';</script>
801-->
802<script lang="ts">import { good } from 'good';</script>
803"#;
804        let scripts = extract_sfc_scripts(source);
805        assert_eq!(scripts.len(), 1);
806        assert!(scripts[0].body.contains("good"));
807    }
808
809    // ── <script src="..."> generates side-effect import ─────────
810
811    #[test]
812    fn script_src_generates_side_effect_import() {
813        let info = parse_sfc_to_module(
814            FileId(0),
815            Path::new("External.vue"),
816            r#"<script src="./external-logic.ts" lang="ts"></script>"#,
817            0,
818            false,
819        );
820        assert!(
821            info.imports
822                .iter()
823                .any(|i| i.source == "./external-logic.ts"
824                    && matches!(i.imported_name, ImportedName::SideEffect)),
825            "script src should generate a side-effect import"
826        );
827    }
828
829    // ── Additional coverage ─────────────────────────────────────
830
831    #[test]
832    fn parse_sfc_no_script_returns_empty_module() {
833        let info = parse_sfc_to_module(
834            FileId(0),
835            Path::new("Empty.vue"),
836            "<template><div>Hello</div></template>",
837            42,
838            false,
839        );
840        assert!(info.imports.is_empty());
841        assert!(info.exports.is_empty());
842        assert_eq!(info.content_hash, 42);
843        assert_eq!(info.file_id, FileId(0));
844    }
845
846    #[test]
847    fn parse_sfc_has_line_offsets() {
848        let info = parse_sfc_to_module(
849            FileId(0),
850            Path::new("LineOffsets.vue"),
851            r#"<script lang="ts">const x = 1;</script>"#,
852            0,
853            false,
854        );
855        assert!(!info.line_offsets.is_empty());
856    }
857
858    #[test]
859    fn parse_sfc_has_suppressions() {
860        let info = parse_sfc_to_module(
861            FileId(0),
862            Path::new("Suppressions.vue"),
863            r#"<script lang="ts">
864// fallow-ignore-file
865export const foo = 1;
866</script>"#,
867            0,
868            false,
869        );
870        assert!(!info.suppressions.is_empty());
871    }
872
873    #[test]
874    fn source_type_jsx_detection() {
875        let scripts = extract_sfc_scripts(r#"<script lang="jsx">const el = <div />;</script>"#);
876        assert_eq!(scripts.len(), 1);
877        assert!(!scripts[0].is_typescript);
878        assert!(scripts[0].is_jsx);
879    }
880
881    #[test]
882    fn source_type_plain_js_detection() {
883        let scripts = extract_sfc_scripts("<script>const x = 1;</script>");
884        assert_eq!(scripts.len(), 1);
885        assert!(!scripts[0].is_typescript);
886        assert!(!scripts[0].is_jsx);
887    }
888
889    #[test]
890    fn is_sfc_file_rejects_no_extension() {
891        assert!(!is_sfc_file(Path::new("Makefile")));
892    }
893
894    #[test]
895    fn is_sfc_file_rejects_mdx() {
896        assert!(!is_sfc_file(Path::new("post.mdx")));
897    }
898
899    #[test]
900    fn is_sfc_file_rejects_css() {
901        assert!(!is_sfc_file(Path::new("styles.css")));
902    }
903
904    #[test]
905    fn multiple_script_blocks_both_have_offsets() {
906        let source = r#"<script lang="ts">const a = 1;</script>
907<script setup lang="ts">const b = 2;</script>"#;
908        let scripts = extract_sfc_scripts(source);
909        assert_eq!(scripts.len(), 2);
910        // Both scripts should have valid byte offsets
911        let offset0 = scripts[0].byte_offset;
912        let offset1 = scripts[1].byte_offset;
913        assert_eq!(
914            &source[offset0..offset0 + "const a = 1;".len()],
915            "const a = 1;"
916        );
917        assert_eq!(
918            &source[offset1..offset1 + "const b = 2;".len()],
919            "const b = 2;"
920        );
921    }
922
923    #[test]
924    fn script_with_src_and_lang() {
925        // src + lang should both be detected
926        let scripts = extract_sfc_scripts(r#"<script src="./logic.ts" lang="tsx"></script>"#);
927        assert_eq!(scripts.len(), 1);
928        assert_eq!(scripts[0].src.as_deref(), Some("./logic.ts"));
929        assert!(scripts[0].is_typescript);
930        assert!(scripts[0].is_jsx);
931    }
932
933    // ── extract_sfc_styles (issue #195 Case B) ──
934
935    #[test]
936    fn extract_style_block_lang_scss() {
937        let source = r#"<template/><style lang="scss">@import 'Foo';</style>"#;
938        let styles = extract_sfc_styles(source);
939        assert_eq!(styles.len(), 1);
940        assert_eq!(styles[0].lang.as_deref(), Some("scss"));
941        assert!(styles[0].body.contains("@import"));
942        assert!(styles[0].src.is_none());
943    }
944
945    #[test]
946    fn extract_style_block_with_src() {
947        let source = r#"<style src="./theme.scss" lang="scss"></style>"#;
948        let styles = extract_sfc_styles(source);
949        assert_eq!(styles.len(), 1);
950        assert_eq!(styles[0].src.as_deref(), Some("./theme.scss"));
951        assert_eq!(styles[0].lang.as_deref(), Some("scss"));
952    }
953
954    #[test]
955    fn extract_style_block_plain_no_lang() {
956        let source = r"<style>.foo { color: red; }</style>";
957        let styles = extract_sfc_styles(source);
958        assert_eq!(styles.len(), 1);
959        assert!(styles[0].lang.is_none());
960    }
961
962    #[test]
963    fn extract_multiple_style_blocks() {
964        let source = r#"<style lang="scss">@import 'a';</style>
965<style scoped lang="scss">@import 'b';</style>"#;
966        let styles = extract_sfc_styles(source);
967        assert_eq!(styles.len(), 2);
968    }
969
970    #[test]
971    fn style_block_inside_html_comment_filtered() {
972        let source = r#"<!-- <style lang="scss">@import 'bad';</style> -->
973<style lang="scss">@import 'good';</style>"#;
974        let styles = extract_sfc_styles(source);
975        assert_eq!(styles.len(), 1);
976        assert!(styles[0].body.contains("good"));
977    }
978
979    #[test]
980    fn parse_sfc_extracts_style_imports_with_from_style_flag() {
981        let info = parse_sfc_to_module(
982            FileId(0),
983            Path::new("Foo.vue"),
984            r#"<template/><style lang="scss">@import 'Foo';</style>"#,
985            0,
986            false,
987        );
988        let style_import = info
989            .imports
990            .iter()
991            .find(|i| i.source == "./Foo")
992            .expect("scss @import 'Foo' should be normalized to ./Foo");
993        assert!(
994            style_import.from_style,
995            "imports from <style> blocks must carry from_style=true so the resolver \
996             enables SCSS partial fallback for the SFC importer"
997        );
998        assert!(matches!(
999            style_import.imported_name,
1000            ImportedName::SideEffect
1001        ));
1002    }
1003
1004    #[test]
1005    fn parse_sfc_extracts_style_plugin_as_default_import() {
1006        let info = parse_sfc_to_module(
1007            FileId(0),
1008            Path::new("Foo.vue"),
1009            r#"<template/><style>@plugin "./tailwind-plugin.js";</style>"#,
1010            0,
1011            false,
1012        );
1013        let plugin_import = info
1014            .imports
1015            .iter()
1016            .find(|i| i.source == "./tailwind-plugin.js")
1017            .expect("style @plugin should create an import");
1018        assert!(plugin_import.from_style);
1019        assert!(matches!(plugin_import.imported_name, ImportedName::Default));
1020    }
1021
1022    #[test]
1023    fn parse_sfc_extracts_style_src_with_from_style_flag() {
1024        let info = parse_sfc_to_module(
1025            FileId(0),
1026            Path::new("Bar.vue"),
1027            r#"<style src="./Bar.scss" lang="scss"></style>"#,
1028            0,
1029            false,
1030        );
1031        let style_src = info
1032            .imports
1033            .iter()
1034            .find(|i| i.source == "./Bar.scss")
1035            .expect("<style src=\"./Bar.scss\"> should produce a side-effect import");
1036        assert!(style_src.from_style);
1037    }
1038
1039    #[test]
1040    fn parse_sfc_skips_unsupported_style_lang_body_but_keeps_src() {
1041        // <style lang="postcss"> body is NOT scanned (custom directives); src is still seeded.
1042        let info = parse_sfc_to_module(
1043            FileId(0),
1044            Path::new("Baz.vue"),
1045            r#"<style lang="postcss" src="./Baz.pcss">@custom-rule "skipped";</style>"#,
1046            0,
1047            false,
1048        );
1049        assert!(
1050            info.imports.iter().any(|i| i.source == "./Baz.pcss"),
1051            "src reference should still be seeded for unsupported lang"
1052        );
1053        assert!(
1054            !info.imports.iter().any(|i| i.source.contains("skipped")),
1055            "postcss body should not be scanned for @import directives"
1056        );
1057    }
1058}
fallow_extract/sfc.rs

fallow_extract/
sfc.rs
