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

fallow_extract/
sfc.rs
