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` metadata, and `generic` attributes, and filtering
5//! HTML comments. Vue external script references are emitted as graph edges;
6//! Svelte markup-level script `src` references are treated as runtime HTML.
7//! Also extracts `<style>` block sources (`@import` / `@use` / `@forward` /
8//! `@plugin` and `<style src="...">`) so referenced CSS / SCSS files become
9//! reachable from the component, preventing false `unused-files` reports on
10//! co-located styles.
11
12use std::path::Path;
13use std::sync::LazyLock;
14
15use oxc_allocator::Allocator;
16use oxc_ast_visit::Visit;
17use oxc_parser::Parser;
18use oxc_span::SourceType;
19use rustc_hash::{FxHashMap, FxHashSet};
20
21use crate::asset_url::normalize_asset_url;
22use crate::parse::{
23    compute_auto_import_candidates, compute_import_binding_usage, compute_semantic_usage,
24};
25use crate::sfc_template::{SfcKind, collect_template_usage_with_bound_targets};
26use crate::source_map::ExtractionResult;
27use crate::visitor::ModuleInfoExtractor;
28use crate::{ImportInfo, ImportedName, ModuleInfo};
29use fallow_types::discover::FileId;
30use fallow_types::extract::{FunctionComplexity, byte_offset_to_line_col, compute_line_offsets};
31use oxc_span::Span;
32
33/// Regex to extract `<script>` block content from Vue/Svelte SFCs.
34/// The attrs pattern handles `>` inside quoted attribute values (e.g., `generic="T extends Foo<Bar>"`).
35static SCRIPT_BLOCK_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
36    crate::static_regex(
37        r#"(?is)<script\b(?P<attrs>(?:[^>"']|"[^"]*"|'[^']*')*)>(?P<body>[\s\S]*?)</script>"#,
38    )
39});
40
41/// Regex to extract the `lang` attribute value from a script tag.
42static LANG_ATTR_RE: LazyLock<regex::Regex> =
43    LazyLock::new(|| crate::static_regex(r#"lang\s*=\s*["'](\w+)["']"#));
44
45/// Regex to extract the `src` attribute value from a script tag.
46/// Requires whitespace (or start of string) before `src` to avoid matching `data-src` etc.
47static SRC_ATTR_RE: LazyLock<regex::Regex> =
48    LazyLock::new(|| crate::static_regex(r#"(?:^|\s)src\s*=\s*["']([^"']+)["']"#));
49
50/// Regex to detect Vue's bare `setup` attribute.
51static SETUP_ATTR_RE: LazyLock<regex::Regex> =
52    LazyLock::new(|| crate::static_regex(r"(?:^|\s)setup(?:\s|$)"));
53
54/// Regex to detect Svelte's `context="module"` attribute.
55static CONTEXT_MODULE_ATTR_RE: LazyLock<regex::Regex> =
56    LazyLock::new(|| crate::static_regex(r#"context\s*=\s*["']module["']"#));
57
58/// Regex to extract Vue's `generic="..."` attribute value (script-setup
59/// generics). Matches the contents between the quotes and stops at the
60/// closing quote, mirroring `LANG_ATTR_RE`.
61static VUE_GENERIC_ATTR_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
62    crate::static_regex(r#"(?:^|\s)generic\s*=\s*"([^"]*)"|(?:^|\s)generic\s*=\s*'([^']*)'"#)
63});
64
65/// Regex to extract Svelte's `generics="..."` attribute value (Svelte 4
66/// generic script attribute, repurposed by some Svelte 5 code).
67static SVELTE_GENERICS_ATTR_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
68    crate::static_regex(r#"(?:^|\s)generics\s*=\s*"([^"]*)"|(?:^|\s)generics\s*=\s*'([^']*)'"#)
69});
70
71/// Regex to match HTML comments for filtering script blocks inside comments.
72static HTML_COMMENT_RE: LazyLock<regex::Regex> =
73    LazyLock::new(|| crate::static_regex(r"(?s)<!--.*?-->"));
74
75/// Regex to extract `<style>` block content from Vue/Svelte SFCs.
76/// Mirrors `SCRIPT_BLOCK_RE`: handles `>` inside quoted attribute values and
77/// captures the body so `@import` / `@use` / `@forward` directives can be parsed.
78static STYLE_BLOCK_RE: LazyLock<regex::Regex> = LazyLock::new(|| {
79    crate::static_regex(
80        r#"(?is)<style\b(?P<attrs>(?:[^>"']|"[^"]*"|'[^']*')*)>(?P<body>[\s\S]*?)</style>"#,
81    )
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    /// Span of the `src` attribute value in the full SFC source.
97    pub src_span: Option<Span>,
98    /// Whether this script is a Vue `<script setup>` block.
99    pub is_setup: bool,
100    /// Whether this script is a Svelte module-context block.
101    pub is_context_module: bool,
102    /// Type-parameter list from a `generic="..."` (Vue) or `generics="..."`
103    /// (Svelte) attribute on the script tag. Holds the bare constraint, no
104    /// surrounding angle brackets, e.g. `T extends Test<boolean>`.
105    pub generic_attr: Option<String>,
106}
107
108/// Extract all `<script>` blocks from a Vue/Svelte SFC source string.
109pub fn extract_sfc_scripts(source: &str) -> Vec<SfcScript> {
110    let comment_ranges: Vec<(usize, usize)> = HTML_COMMENT_RE
111        .find_iter(source)
112        .map(|m| (m.start(), m.end()))
113        .collect();
114
115    SCRIPT_BLOCK_RE
116        .captures_iter(source)
117        .filter(|cap| {
118            let start = cap.get(0).map_or(0, |m| m.start());
119            !comment_ranges
120                .iter()
121                .any(|&(cs, ce)| start >= cs && start < ce)
122        })
123        .map(|cap| {
124            let attrs = cap.name("attrs").map_or("", |m| m.as_str());
125            let body_match = cap.name("body");
126            let byte_offset = body_match.map_or(0, |m| m.start());
127            let body = body_match.map_or("", |m| m.as_str()).to_string();
128            let lang = LANG_ATTR_RE
129                .captures(attrs)
130                .and_then(|c| c.get(1))
131                .map(|m| m.as_str());
132            let is_typescript = matches!(lang, Some("ts" | "tsx"));
133            let is_jsx = matches!(lang, Some("tsx" | "jsx"));
134            let src = SRC_ATTR_RE
135                .captures(attrs)
136                .and_then(|c| c.get(1))
137                .map(|m| m.as_str().to_string());
138            let attrs_start = cap.name("attrs").map_or(0, |m| m.start());
139            let src_span = SRC_ATTR_RE.captures(attrs).and_then(|c| c.get(1)).map(|m| {
140                Span::new(
141                    (attrs_start + m.start()) as u32,
142                    (attrs_start + m.end()) as u32,
143                )
144            });
145            let is_setup = SETUP_ATTR_RE.is_match(attrs);
146            let is_context_module = CONTEXT_MODULE_ATTR_RE.is_match(attrs);
147            let generic_attr = VUE_GENERIC_ATTR_RE
148                .captures(attrs)
149                .or_else(|| SVELTE_GENERICS_ATTR_RE.captures(attrs))
150                .and_then(|cap| cap.get(1).or_else(|| cap.get(2)))
151                .map(|m| m.as_str().to_string())
152                .filter(|value| !value.trim().is_empty());
153            SfcScript {
154                body,
155                is_typescript,
156                is_jsx,
157                byte_offset,
158                src,
159                src_span,
160                is_setup,
161                is_context_module,
162                generic_attr,
163            }
164        })
165        .collect()
166}
167
168/// An extracted `<style>` block from a Vue or Svelte SFC.
169pub struct SfcStyle {
170    /// The style body text (CSS / SCSS / Sass / Less / Stylus / PostCSS source).
171    pub body: String,
172    /// The `lang` attribute value (`scss`, `sass`, `less`, `stylus`, `postcss`, ...).
173    /// `None` for plain `<style>` (CSS).
174    pub lang: Option<String>,
175    /// External style source path from the `src` attribute (`<style src="./theme.scss">`).
176    pub src: Option<String>,
177    /// Span of the `src` attribute value in the full SFC source.
178    pub src_span: Option<Span>,
179    /// Byte offset of the style body within the full SFC source.
180    pub byte_offset: usize,
181}
182
183/// Extract all `<style>` blocks from a Vue/Svelte SFC source string.
184///
185/// Mirrors [`extract_sfc_scripts`]: filters blocks inside HTML comments and
186/// captures the `lang` and `src` attributes so the caller can route the body to
187/// the right preprocessor's import scanner (currently only CSS / SCSS / Sass) or
188/// seed the `src` reference as a side-effect import.
189pub fn extract_sfc_styles(source: &str) -> Vec<SfcStyle> {
190    let comment_ranges: Vec<(usize, usize)> = HTML_COMMENT_RE
191        .find_iter(source)
192        .map(|m| (m.start(), m.end()))
193        .collect();
194
195    STYLE_BLOCK_RE
196        .captures_iter(source)
197        .filter(|cap| {
198            let start = cap.get(0).map_or(0, |m| m.start());
199            !comment_ranges
200                .iter()
201                .any(|&(cs, ce)| start >= cs && start < ce)
202        })
203        .map(|cap| {
204            let attrs = cap.name("attrs").map_or("", |m| m.as_str());
205            let body = cap.name("body").map_or("", |m| m.as_str()).to_string();
206            let byte_offset = cap.name("body").map_or(0, |m| m.start());
207            let lang = LANG_ATTR_RE
208                .captures(attrs)
209                .and_then(|c| c.get(1))
210                .map(|m| m.as_str().to_string());
211            let src = SRC_ATTR_RE
212                .captures(attrs)
213                .and_then(|c| c.get(1))
214                .map(|m| m.as_str().to_string());
215            let attrs_start = cap.name("attrs").map_or(0, |m| m.start());
216            let src_span = SRC_ATTR_RE.captures(attrs).and_then(|c| c.get(1)).map(|m| {
217                Span::new(
218                    (attrs_start + m.start()) as u32,
219                    (attrs_start + m.end()) as u32,
220                )
221            });
222            SfcStyle {
223                body,
224                lang,
225                src,
226                src_span,
227                byte_offset,
228            }
229        })
230        .collect()
231}
232
233/// Check if a file path is a Vue or Svelte SFC (`.vue` or `.svelte`).
234#[must_use]
235pub fn is_sfc_file(path: &Path) -> bool {
236    path.extension()
237        .and_then(|e| e.to_str())
238        .is_some_and(|ext| ext == "vue" || ext == "svelte")
239}
240
241/// Parse an SFC file by extracting and combining all `<script>` and `<style>` blocks.
242pub(crate) fn parse_sfc_to_module(
243    file_id: FileId,
244    path: &Path,
245    source: &str,
246    content_hash: u64,
247    need_complexity: bool,
248) -> ModuleInfo {
249    let scripts = extract_sfc_scripts(source);
250    let styles = extract_sfc_styles(source);
251    let kind = sfc_kind(path);
252    let mut combined = empty_sfc_module(file_id, source, content_hash);
253    let mut template_visible_imports: FxHashSet<String> = FxHashSet::default();
254    let mut template_visible_bound_targets: FxHashMap<String, String> = FxHashMap::default();
255
256    for script in &scripts {
257        merge_script_into_module(
258            kind,
259            script,
260            &mut combined,
261            &mut template_visible_imports,
262            &mut template_visible_bound_targets,
263            need_complexity,
264        );
265    }
266
267    for style in &styles {
268        merge_style_into_module(style, &mut combined);
269    }
270
271    apply_template_usage(
272        kind,
273        source,
274        &template_visible_imports,
275        &template_visible_bound_targets,
276        &mut combined,
277    );
278    combined.unused_import_bindings.sort_unstable();
279    combined.unused_import_bindings.dedup();
280    combined.type_referenced_import_bindings.sort_unstable();
281    combined.type_referenced_import_bindings.dedup();
282    combined.value_referenced_import_bindings.sort_unstable();
283    combined.value_referenced_import_bindings.dedup();
284    combined.auto_import_candidates.sort_unstable();
285    combined.auto_import_candidates.dedup();
286
287    combined
288}
289
290fn sfc_kind(path: &Path) -> SfcKind {
291    if path.extension().and_then(|ext| ext.to_str()) == Some("vue") {
292        SfcKind::Vue
293    } else {
294        SfcKind::Svelte
295    }
296}
297
298fn empty_sfc_module(file_id: FileId, source: &str, content_hash: u64) -> ModuleInfo {
299    let parsed = crate::suppress::parse_suppressions_from_source(source);
300
301    ModuleInfo {
302        file_id,
303        exports: Vec::new(),
304        imports: Vec::new(),
305        re_exports: Vec::new(),
306        dynamic_imports: Vec::new(),
307        dynamic_import_patterns: Vec::new(),
308        require_calls: Vec::new(),
309        package_path_references: Vec::new(),
310        member_accesses: Vec::new(),
311        whole_object_uses: Vec::new(),
312        has_cjs_exports: false,
313        has_angular_component_template_url: false,
314        content_hash,
315        suppressions: parsed.suppressions,
316        unknown_suppression_kinds: parsed.unknown_kinds,
317        unused_import_bindings: Vec::new(),
318        type_referenced_import_bindings: Vec::new(),
319        value_referenced_import_bindings: Vec::new(),
320        line_offsets: compute_line_offsets(source),
321        complexity: Vec::new(),
322        flag_uses: Vec::new(),
323        class_heritage: vec![],
324        injection_tokens: vec![],
325        local_type_declarations: Vec::new(),
326        public_signature_type_references: Vec::new(),
327        namespace_object_aliases: Vec::new(),
328        iconify_prefixes: Vec::new(),
329        iconify_icon_names: Vec::new(),
330        auto_import_candidates: Vec::new(),
331        directives: Vec::new(),
332        security_sinks: Vec::new(),
333        security_sinks_skipped: 0,
334        tainted_bindings: Vec::new(),
335        sanitized_sink_args: Vec::new(),
336        security_control_sites: Vec::new(),
337    }
338}
339
340fn merge_script_into_module(
341    kind: SfcKind,
342    script: &SfcScript,
343    combined: &mut ModuleInfo,
344    template_visible_imports: &mut FxHashSet<String>,
345    template_visible_bound_targets: &mut FxHashMap<String, String>,
346    need_complexity: bool,
347) {
348    if kind == SfcKind::Vue
349        && let Some(src) = &script.src
350    {
351        add_script_src_import(combined, src, script.src_span);
352    }
353
354    let allocator = Allocator::default();
355    let parser_return =
356        Parser::new(&allocator, &script.body, source_type_for_script(script)).parse();
357    let mut extractor = ModuleInfoExtractor::new();
358    extractor.visit_program(&parser_return.program);
359    let extraction = ExtractionResult::contiguous(&script.body, script.byte_offset);
360    extractor.remap_spans_with(|span| extraction.remap_span(span));
361    extractor.resolve_typed_destructure_bindings();
362
363    let augmented_body = build_generic_attr_probe_source(script);
364    let empty_template_used = rustc_hash::FxHashSet::default();
365    let (binding_usage, auto_import_candidates) = if let Some(augmented) = augmented_body.as_deref()
366    {
367        let augmented_return =
368            Parser::new(&allocator, augmented, source_type_for_script(script)).parse();
369        (
370            compute_import_binding_usage(
371                &augmented_return.program,
372                &extractor.imports,
373                &empty_template_used,
374            ),
375            compute_auto_import_candidates(&parser_return.program),
376        )
377    } else {
378        let semantic_usage = compute_semantic_usage(
379            &parser_return.program,
380            &extractor.imports,
381            &empty_template_used,
382        );
383        (
384            semantic_usage.import_binding_usage,
385            semantic_usage.auto_import_candidates,
386        )
387    };
388    combined
389        .unused_import_bindings
390        .extend(binding_usage.unused.iter().cloned());
391    combined
392        .type_referenced_import_bindings
393        .extend(binding_usage.type_referenced.iter().cloned());
394    combined
395        .value_referenced_import_bindings
396        .extend(binding_usage.value_referenced.iter().cloned());
397    combined
398        .auto_import_candidates
399        .extend(auto_import_candidates);
400    if need_complexity {
401        combined.complexity.extend(translate_script_complexity(
402            script,
403            &parser_return.program,
404            &combined.line_offsets,
405        ));
406    }
407
408    if is_template_visible_script(kind, script) {
409        template_visible_imports.extend(
410            extractor
411                .imports
412                .iter()
413                .filter(|import| !import.local_name.is_empty())
414                .map(|import| import.local_name.clone()),
415        );
416        template_visible_bound_targets.extend(
417            extractor
418                .binding_target_names()
419                .iter()
420                .filter(|(local, _)| !local.starts_with("this."))
421                .map(|(local, target)| (local.clone(), target.clone())),
422        );
423    }
424
425    extractor.merge_into(combined);
426}
427
428fn translate_script_complexity(
429    script: &SfcScript,
430    program: &oxc_ast::ast::Program<'_>,
431    sfc_line_offsets: &[u32],
432) -> Vec<FunctionComplexity> {
433    let script_line_offsets = compute_line_offsets(&script.body);
434    let mut complexity =
435        crate::complexity::compute_complexity(program, &script.body, &script_line_offsets);
436    let (body_start_line, body_start_col) =
437        byte_offset_to_line_col(sfc_line_offsets, script.byte_offset as u32);
438
439    for function in &mut complexity {
440        function.line = body_start_line + function.line.saturating_sub(1);
441        if function.line == body_start_line {
442            function.col += body_start_col;
443        }
444    }
445
446    complexity
447}
448
449fn add_script_src_import(module: &mut ModuleInfo, source: &str, source_span: Option<Span>) {
450    let span = source_span.unwrap_or_default();
451    module.imports.push(ImportInfo {
452        source: normalize_asset_url(source),
453        imported_name: ImportedName::SideEffect,
454        local_name: String::new(),
455        is_type_only: false,
456        from_style: false,
457        span,
458        source_span: span,
459    });
460}
461
462/// `lang` attribute values whose body we know how to scan for `@import` /
463/// `@use` / `@forward` / `@plugin` directives. Plain `<style>` (no `lang`) is treated as
464/// CSS. `less`, `stylus`, and `postcss` bodies are NOT scanned because their
465/// import syntax differs (`@import (reference)` modifiers, etc.); their
466/// `<style src="...">` references are still seeded.
467fn style_lang_is_scss(lang: Option<&str>) -> bool {
468    matches!(lang, Some("scss" | "sass"))
469}
470
471fn style_lang_is_css_like(lang: Option<&str>) -> bool {
472    lang.is_none() || matches!(lang, Some("css"))
473}
474
475fn merge_style_into_module(style: &SfcStyle, combined: &mut ModuleInfo) {
476    if let Some(src) = &style.src {
477        let span = style.src_span.unwrap_or_default();
478        combined.imports.push(ImportInfo {
479            source: normalize_asset_url(src),
480            imported_name: ImportedName::SideEffect,
481            local_name: String::new(),
482            is_type_only: false,
483            from_style: true,
484            span,
485            source_span: span,
486        });
487    }
488
489    let lang = style.lang.as_deref();
490    let is_scss = style_lang_is_scss(lang);
491    let is_css_like = style_lang_is_css_like(lang);
492    if !is_scss && !is_css_like {
493        return;
494    }
495
496    for source in crate::css::extract_css_import_sources(&style.body, is_scss) {
497        let source_span = Span::new(
498            style.byte_offset as u32 + source.span.start,
499            style.byte_offset as u32 + source.span.end,
500        );
501        combined.imports.push(ImportInfo {
502            source: source.normalized,
503            imported_name: if source.is_plugin {
504                ImportedName::Default
505            } else {
506                ImportedName::SideEffect
507            },
508            local_name: String::new(),
509            is_type_only: false,
510            from_style: true,
511            span: source_span,
512            source_span,
513        });
514    }
515}
516
517fn source_type_for_script(script: &SfcScript) -> SourceType {
518    match (script.is_typescript, script.is_jsx) {
519        (true, true) => SourceType::tsx(),
520        (true, false) => SourceType::ts(),
521        (false, true) => SourceType::jsx(),
522        (false, false) => SourceType::mjs(),
523    }
524}
525
526/// Build an augmented script body that pins the `generic="..."` constraint as
527/// a synthetic local type alias. The alias is unexported and uses a sentinel
528/// name so it can't collide with user code. Returns `None` when there is no
529/// generic attribute to pin (the common case), so callers fall back to the
530/// raw body without paying for a second parse.
531fn build_generic_attr_probe_source(script: &SfcScript) -> Option<String> {
532    let constraint = script.generic_attr.as_deref()?.trim();
533    if constraint.is_empty() {
534        return None;
535    }
536    Some(format!(
537        "{}\n;type __FALLOW_GENERIC_ATTR_PROBE<{}> = unknown;\n",
538        script.body, constraint,
539    ))
540}
541
542fn apply_template_usage(
543    kind: SfcKind,
544    source: &str,
545    template_visible_imports: &FxHashSet<String>,
546    template_visible_bound_targets: &FxHashMap<String, String>,
547    combined: &mut ModuleInfo,
548) {
549    let template_usage = collect_template_usage_with_bound_targets(
550        kind,
551        source,
552        template_visible_imports,
553        template_visible_bound_targets,
554    );
555    combined
556        .unused_import_bindings
557        .retain(|binding| !template_usage.used_bindings.contains(binding));
558    combined
559        .member_accesses
560        .extend(template_usage.member_accesses);
561    combined
562        .whole_object_uses
563        .extend(template_usage.whole_object_uses);
564    combined
565        .security_sinks
566        .extend(template_usage.security_sinks);
567    if !template_usage.unresolved_tag_names.is_empty() {
568        let mut names: Vec<String> = template_usage.unresolved_tag_names.into_iter().collect();
569        names.sort_unstable();
570        combined.auto_import_candidates.extend(names);
571        combined.auto_import_candidates.dedup();
572    }
573}
574
575fn is_template_visible_script(kind: SfcKind, script: &SfcScript) -> bool {
576    match kind {
577        SfcKind::Vue => script.is_setup,
578        SfcKind::Svelte => !script.is_context_module,
579    }
580}
581
582#[cfg(all(test, not(miri)))]
583mod tests {
584    use super::*;
585
586    #[test]
587    fn is_sfc_file_vue() {
588        assert!(is_sfc_file(Path::new("App.vue")));
589    }
590
591    #[test]
592    fn is_sfc_file_svelte() {
593        assert!(is_sfc_file(Path::new("Counter.svelte")));
594    }
595
596    #[test]
597    fn is_sfc_file_rejects_ts() {
598        assert!(!is_sfc_file(Path::new("utils.ts")));
599    }
600
601    #[test]
602    fn is_sfc_file_rejects_jsx() {
603        assert!(!is_sfc_file(Path::new("App.jsx")));
604    }
605
606    #[test]
607    fn is_sfc_file_rejects_astro() {
608        assert!(!is_sfc_file(Path::new("Layout.astro")));
609    }
610
611    #[test]
612    fn single_plain_script() {
613        let scripts = extract_sfc_scripts("<script>const x = 1;</script>");
614        assert_eq!(scripts.len(), 1);
615        assert_eq!(scripts[0].body, "const x = 1;");
616        assert!(!scripts[0].is_typescript);
617        assert!(!scripts[0].is_jsx);
618        assert!(scripts[0].src.is_none());
619    }
620
621    #[test]
622    fn single_ts_script() {
623        let scripts = extract_sfc_scripts(r#"<script lang="ts">const x: number = 1;</script>"#);
624        assert_eq!(scripts.len(), 1);
625        assert!(scripts[0].is_typescript);
626        assert!(!scripts[0].is_jsx);
627    }
628
629    #[test]
630    fn single_tsx_script() {
631        let scripts = extract_sfc_scripts(r#"<script lang="tsx">const el = <div />;</script>"#);
632        assert_eq!(scripts.len(), 1);
633        assert!(scripts[0].is_typescript);
634        assert!(scripts[0].is_jsx);
635    }
636
637    #[test]
638    fn single_jsx_script() {
639        let scripts = extract_sfc_scripts(r#"<script lang="jsx">const el = <div />;</script>"#);
640        assert_eq!(scripts.len(), 1);
641        assert!(!scripts[0].is_typescript);
642        assert!(scripts[0].is_jsx);
643    }
644
645    #[test]
646    fn two_script_blocks() {
647        let source = r#"
648<script lang="ts">
649export default {};
650</script>
651<script setup lang="ts">
652const count = 0;
653</script>
654"#;
655        let scripts = extract_sfc_scripts(source);
656        assert_eq!(scripts.len(), 2);
657        assert!(scripts[0].body.contains("export default"));
658        assert!(scripts[1].body.contains("count"));
659    }
660
661    #[test]
662    fn script_setup_extracted() {
663        let scripts =
664            extract_sfc_scripts(r#"<script setup lang="ts">import { ref } from 'vue';</script>"#);
665        assert_eq!(scripts.len(), 1);
666        assert!(scripts[0].body.contains("import"));
667        assert!(scripts[0].is_typescript);
668    }
669
670    #[test]
671    fn script_src_detected() {
672        let scripts = extract_sfc_scripts(r#"<script src="./component.ts" lang="ts"></script>"#);
673        assert_eq!(scripts.len(), 1);
674        assert_eq!(scripts[0].src.as_deref(), Some("./component.ts"));
675    }
676
677    #[test]
678    fn data_src_not_treated_as_src() {
679        let scripts =
680            extract_sfc_scripts(r#"<script lang="ts" data-src="./nope.ts">const x = 1;</script>"#);
681        assert_eq!(scripts.len(), 1);
682        assert!(scripts[0].src.is_none());
683    }
684
685    #[test]
686    fn script_inside_html_comment_filtered() {
687        let source = r#"
688<!-- <script lang="ts">import { bad } from 'bad';</script> -->
689<script lang="ts">import { good } from 'good';</script>
690"#;
691        let scripts = extract_sfc_scripts(source);
692        assert_eq!(scripts.len(), 1);
693        assert!(scripts[0].body.contains("good"));
694    }
695
696    #[test]
697    fn spanning_comment_filters_script() {
698        let source = r#"
699<!-- disabled:
700<script lang="ts">import { bad } from 'bad';</script>
701-->
702<script lang="ts">const ok = true;</script>
703"#;
704        let scripts = extract_sfc_scripts(source);
705        assert_eq!(scripts.len(), 1);
706        assert!(scripts[0].body.contains("ok"));
707    }
708
709    #[test]
710    fn string_containing_comment_markers_not_corrupted() {
711        let source = r#"
712<script setup lang="ts">
713const marker = "<!-- not a comment -->";
714import { ref } from 'vue';
715</script>
716"#;
717        let scripts = extract_sfc_scripts(source);
718        assert_eq!(scripts.len(), 1);
719        assert!(scripts[0].body.contains("import"));
720    }
721
722    #[test]
723    fn generic_attr_with_angle_bracket() {
724        let source =
725            r#"<script setup lang="ts" generic="T extends Foo<Bar>">const x = 1;</script>"#;
726        let scripts = extract_sfc_scripts(source);
727        assert_eq!(scripts.len(), 1);
728        assert_eq!(scripts[0].body, "const x = 1;");
729    }
730
731    #[test]
732    fn nested_generic_attr() {
733        let source = r#"<script setup lang="ts" generic="T extends Map<string, Set<number>>">const x = 1;</script>"#;
734        let scripts = extract_sfc_scripts(source);
735        assert_eq!(scripts.len(), 1);
736        assert_eq!(scripts[0].body, "const x = 1;");
737    }
738
739    #[test]
740    fn lang_single_quoted() {
741        let scripts = extract_sfc_scripts("<script lang='ts'>const x = 1;</script>");
742        assert_eq!(scripts.len(), 1);
743        assert!(scripts[0].is_typescript);
744    }
745
746    #[test]
747    fn uppercase_script_tag() {
748        let scripts = extract_sfc_scripts(r#"<SCRIPT lang="ts">const x = 1;</SCRIPT>"#);
749        assert_eq!(scripts.len(), 1);
750        assert!(scripts[0].is_typescript);
751    }
752
753    #[test]
754    fn no_script_block() {
755        let scripts = extract_sfc_scripts("<template><div>Hello</div></template>");
756        assert!(scripts.is_empty());
757    }
758
759    #[test]
760    fn empty_script_body() {
761        let scripts = extract_sfc_scripts(r#"<script lang="ts"></script>"#);
762        assert_eq!(scripts.len(), 1);
763        assert!(scripts[0].body.is_empty());
764    }
765
766    #[test]
767    fn whitespace_only_script() {
768        let scripts = extract_sfc_scripts("<script lang=\"ts\">\n  \n</script>");
769        assert_eq!(scripts.len(), 1);
770        assert!(scripts[0].body.trim().is_empty());
771    }
772
773    #[test]
774    fn byte_offset_is_set() {
775        let source = r#"<template><div/></template><script lang="ts">code</script>"#;
776        let scripts = extract_sfc_scripts(source);
777        assert_eq!(scripts.len(), 1);
778        let offset = scripts[0].byte_offset;
779        assert_eq!(&source[offset..offset + 4], "code");
780    }
781
782    #[test]
783    fn script_with_extra_attributes() {
784        let scripts = extract_sfc_scripts(
785            r#"<script lang="ts" id="app" type="module" data-custom="val">const x = 1;</script>"#,
786        );
787        assert_eq!(scripts.len(), 1);
788        assert!(scripts[0].is_typescript);
789        assert!(scripts[0].src.is_none());
790    }
791
792    #[test]
793    fn multiple_script_blocks_exports_combined() {
794        let source = r#"
795<script lang="ts">
796export const version = '1.0';
797</script>
798<script setup lang="ts">
799import { ref } from 'vue';
800const count = ref(0);
801</script>
802"#;
803        let info = parse_sfc_to_module(FileId(0), Path::new("Dual.vue"), source, 0, false);
804        assert!(
805            info.exports
806                .iter()
807                .any(|e| matches!(&e.name, crate::ExportName::Named(n) if n == "version")),
808            "export from <script> block should be extracted"
809        );
810        assert!(
811            info.imports.iter().any(|i| i.source == "vue"),
812            "import from <script setup> block should be extracted"
813        );
814    }
815
816    #[test]
817    fn lang_tsx_detected_as_typescript_jsx() {
818        let scripts =
819            extract_sfc_scripts(r#"<script lang="tsx">const el = <div>{x}</div>;</script>"#);
820        assert_eq!(scripts.len(), 1);
821        assert!(scripts[0].is_typescript, "lang=tsx should be typescript");
822        assert!(scripts[0].is_jsx, "lang=tsx should be jsx");
823    }
824
825    #[test]
826    fn multiline_html_comment_filters_all_script_blocks_inside() {
827        let source = r#"
828<!--
829  This whole section is disabled:
830  <script lang="ts">import { bad1 } from 'bad1';</script>
831  <script lang="ts">import { bad2 } from 'bad2';</script>
832-->
833<script lang="ts">import { good } from 'good';</script>
834"#;
835        let scripts = extract_sfc_scripts(source);
836        assert_eq!(scripts.len(), 1);
837        assert!(scripts[0].body.contains("good"));
838    }
839
840    #[test]
841    fn script_src_generates_side_effect_import() {
842        let info = parse_sfc_to_module(
843            FileId(0),
844            Path::new("External.vue"),
845            r#"<script src="./external-logic.ts" lang="ts"></script>"#,
846            0,
847            false,
848        );
849        assert!(
850            info.imports
851                .iter()
852                .any(|i| i.source == "./external-logic.ts"
853                    && matches!(i.imported_name, ImportedName::SideEffect)),
854            "script src should generate a side-effect import"
855        );
856    }
857
858    #[test]
859    fn parse_sfc_no_script_returns_empty_module() {
860        let info = parse_sfc_to_module(
861            FileId(0),
862            Path::new("Empty.vue"),
863            "<template><div>Hello</div></template>",
864            42,
865            false,
866        );
867        assert!(info.imports.is_empty());
868        assert!(info.exports.is_empty());
869        assert_eq!(info.content_hash, 42);
870        assert_eq!(info.file_id, FileId(0));
871    }
872
873    #[test]
874    fn parse_sfc_has_line_offsets() {
875        let info = parse_sfc_to_module(
876            FileId(0),
877            Path::new("LineOffsets.vue"),
878            r#"<script lang="ts">const x = 1;</script>"#,
879            0,
880            false,
881        );
882        assert!(!info.line_offsets.is_empty());
883    }
884
885    #[test]
886    fn parse_sfc_has_suppressions() {
887        let info = parse_sfc_to_module(
888            FileId(0),
889            Path::new("Suppressions.vue"),
890            r#"<script lang="ts">
891// fallow-ignore-file
892export const foo = 1;
893</script>"#,
894            0,
895            false,
896        );
897        assert!(!info.suppressions.is_empty());
898    }
899
900    #[test]
901    fn source_type_jsx_detection() {
902        let scripts = extract_sfc_scripts(r#"<script lang="jsx">const el = <div />;</script>"#);
903        assert_eq!(scripts.len(), 1);
904        assert!(!scripts[0].is_typescript);
905        assert!(scripts[0].is_jsx);
906    }
907
908    #[test]
909    fn source_type_plain_js_detection() {
910        let scripts = extract_sfc_scripts("<script>const x = 1;</script>");
911        assert_eq!(scripts.len(), 1);
912        assert!(!scripts[0].is_typescript);
913        assert!(!scripts[0].is_jsx);
914    }
915
916    #[test]
917    fn is_sfc_file_rejects_no_extension() {
918        assert!(!is_sfc_file(Path::new("Makefile")));
919    }
920
921    #[test]
922    fn is_sfc_file_rejects_mdx() {
923        assert!(!is_sfc_file(Path::new("post.mdx")));
924    }
925
926    #[test]
927    fn is_sfc_file_rejects_css() {
928        assert!(!is_sfc_file(Path::new("styles.css")));
929    }
930
931    #[test]
932    fn multiple_script_blocks_both_have_offsets() {
933        let source = r#"<script lang="ts">const a = 1;</script>
934<script setup lang="ts">const b = 2;</script>"#;
935        let scripts = extract_sfc_scripts(source);
936        assert_eq!(scripts.len(), 2);
937        let offset0 = scripts[0].byte_offset;
938        let offset1 = scripts[1].byte_offset;
939        assert_eq!(
940            &source[offset0..offset0 + "const a = 1;".len()],
941            "const a = 1;"
942        );
943        assert_eq!(
944            &source[offset1..offset1 + "const b = 2;".len()],
945            "const b = 2;"
946        );
947    }
948
949    #[test]
950    fn script_with_src_and_lang() {
951        let scripts = extract_sfc_scripts(r#"<script src="./logic.ts" lang="tsx"></script>"#);
952        assert_eq!(scripts.len(), 1);
953        assert_eq!(scripts[0].src.as_deref(), Some("./logic.ts"));
954        assert!(scripts[0].is_typescript);
955        assert!(scripts[0].is_jsx);
956    }
957
958    #[test]
959    fn extract_style_block_lang_scss() {
960        let source = r#"<template/><style lang="scss">@import 'Foo';</style>"#;
961        let styles = extract_sfc_styles(source);
962        assert_eq!(styles.len(), 1);
963        assert_eq!(styles[0].lang.as_deref(), Some("scss"));
964        assert!(styles[0].body.contains("@import"));
965        assert!(styles[0].src.is_none());
966    }
967
968    #[test]
969    fn extract_style_block_with_src() {
970        let source = r#"<style src="./theme.scss" lang="scss"></style>"#;
971        let styles = extract_sfc_styles(source);
972        assert_eq!(styles.len(), 1);
973        assert_eq!(styles[0].src.as_deref(), Some("./theme.scss"));
974        assert_eq!(styles[0].lang.as_deref(), Some("scss"));
975    }
976
977    #[test]
978    fn extract_style_block_plain_no_lang() {
979        let source = r"<style>.foo { color: red; }</style>";
980        let styles = extract_sfc_styles(source);
981        assert_eq!(styles.len(), 1);
982        assert!(styles[0].lang.is_none());
983    }
984
985    #[test]
986    fn extract_multiple_style_blocks() {
987        let source = r#"<style lang="scss">@import 'a';</style>
988<style scoped lang="scss">@import 'b';</style>"#;
989        let styles = extract_sfc_styles(source);
990        assert_eq!(styles.len(), 2);
991    }
992
993    #[test]
994    fn style_block_inside_html_comment_filtered() {
995        let source = r#"<!-- <style lang="scss">@import 'bad';</style> -->
996<style lang="scss">@import 'good';</style>"#;
997        let styles = extract_sfc_styles(source);
998        assert_eq!(styles.len(), 1);
999        assert!(styles[0].body.contains("good"));
1000    }
1001
1002    #[test]
1003    fn parse_sfc_extracts_style_imports_with_from_style_flag() {
1004        let info = parse_sfc_to_module(
1005            FileId(0),
1006            Path::new("Foo.vue"),
1007            r#"<template/><style lang="scss">@import 'Foo';</style>"#,
1008            0,
1009            false,
1010        );
1011        let style_import = info
1012            .imports
1013            .iter()
1014            .find(|i| i.source == "./Foo")
1015            .expect("scss @import 'Foo' should be normalized to ./Foo");
1016        assert!(
1017            style_import.from_style,
1018            "imports from <style> blocks must carry from_style=true so the resolver \
1019             enables SCSS partial fallback for the SFC importer"
1020        );
1021        assert!(matches!(
1022            style_import.imported_name,
1023            ImportedName::SideEffect
1024        ));
1025    }
1026
1027    #[test]
1028    fn parse_sfc_extracts_style_plugin_as_default_import() {
1029        let info = parse_sfc_to_module(
1030            FileId(0),
1031            Path::new("Foo.vue"),
1032            r#"<template/><style>@plugin "./tailwind-plugin.js";</style>"#,
1033            0,
1034            false,
1035        );
1036        let plugin_import = info
1037            .imports
1038            .iter()
1039            .find(|i| i.source == "./tailwind-plugin.js")
1040            .expect("style @plugin should create an import");
1041        assert!(plugin_import.from_style);
1042        assert!(matches!(plugin_import.imported_name, ImportedName::Default));
1043    }
1044
1045    #[test]
1046    fn parse_sfc_extracts_style_src_with_from_style_flag() {
1047        let info = parse_sfc_to_module(
1048            FileId(0),
1049            Path::new("Bar.vue"),
1050            r#"<style src="./Bar.scss" lang="scss"></style>"#,
1051            0,
1052            false,
1053        );
1054        let style_src = info
1055            .imports
1056            .iter()
1057            .find(|i| i.source == "./Bar.scss")
1058            .expect("<style src=\"./Bar.scss\"> should produce a side-effect import");
1059        assert!(style_src.from_style);
1060    }
1061
1062    #[test]
1063    fn parse_sfc_skips_unsupported_style_lang_body_but_keeps_src() {
1064        let info = parse_sfc_to_module(
1065            FileId(0),
1066            Path::new("Baz.vue"),
1067            r#"<style lang="postcss" src="./Baz.pcss">@custom-rule "skipped";</style>"#,
1068            0,
1069            false,
1070        );
1071        assert!(
1072            info.imports.iter().any(|i| i.source == "./Baz.pcss"),
1073            "src reference should still be seeded for unsupported lang"
1074        );
1075        assert!(
1076            !info.imports.iter().any(|i| i.source.contains("skipped")),
1077            "postcss body should not be scanned for @import directives"
1078        );
1079    }
1080}
fallow_extract/sfc.rs

fallow_extract/
sfc.rs
