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::{FxHashMap, FxHashSet};
17
18use crate::asset_url::normalize_asset_url;
19use crate::parse::compute_import_binding_usage;
20use crate::sfc_template::{SfcKind, collect_template_usage_with_bound_targets};
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    let mut template_visible_bound_targets: FxHashMap<String, String> = FxHashMap::default();
203
204    for script in &scripts {
205        merge_script_into_module(
206            kind,
207            script,
208            &mut combined,
209            &mut template_visible_imports,
210            &mut template_visible_bound_targets,
211            need_complexity,
212        );
213    }
214
215    for style in &styles {
216        merge_style_into_module(style, &mut combined);
217    }
218
219    apply_template_usage(
220        kind,
221        source,
222        &template_visible_imports,
223        &template_visible_bound_targets,
224        &mut combined,
225    );
226    combined.unused_import_bindings.sort_unstable();
227    combined.unused_import_bindings.dedup();
228    combined.type_referenced_import_bindings.sort_unstable();
229    combined.type_referenced_import_bindings.dedup();
230    combined.value_referenced_import_bindings.sort_unstable();
231    combined.value_referenced_import_bindings.dedup();
232
233    combined
234}
235
236fn sfc_kind(path: &Path) -> SfcKind {
237    if path.extension().and_then(|ext| ext.to_str()) == Some("vue") {
238        SfcKind::Vue
239    } else {
240        SfcKind::Svelte
241    }
242}
243
244fn empty_sfc_module(file_id: FileId, source: &str, content_hash: u64) -> ModuleInfo {
245    // For SFC files, use string scanning for suppression comments since script block
246    // byte offsets don't correspond to the original file positions.
247    let suppressions = crate::suppress::parse_suppressions_from_source(source);
248
249    ModuleInfo {
250        file_id,
251        exports: Vec::new(),
252        imports: Vec::new(),
253        re_exports: Vec::new(),
254        dynamic_imports: Vec::new(),
255        dynamic_import_patterns: Vec::new(),
256        require_calls: Vec::new(),
257        member_accesses: Vec::new(),
258        whole_object_uses: Vec::new(),
259        has_cjs_exports: false,
260        content_hash,
261        suppressions,
262        unused_import_bindings: Vec::new(),
263        type_referenced_import_bindings: Vec::new(),
264        value_referenced_import_bindings: Vec::new(),
265        line_offsets: compute_line_offsets(source),
266        complexity: Vec::new(),
267        flag_uses: Vec::new(),
268        class_heritage: vec![],
269    }
270}
271
272fn merge_script_into_module(
273    kind: SfcKind,
274    script: &SfcScript,
275    combined: &mut ModuleInfo,
276    template_visible_imports: &mut FxHashSet<String>,
277    template_visible_bound_targets: &mut FxHashMap<String, String>,
278    need_complexity: bool,
279) {
280    if let Some(src) = &script.src {
281        add_script_src_import(combined, src);
282    }
283
284    let allocator = Allocator::default();
285    let parser_return =
286        Parser::new(&allocator, &script.body, source_type_for_script(script)).parse();
287    let mut extractor = ModuleInfoExtractor::new();
288    extractor.visit_program(&parser_return.program);
289
290    let binding_usage = compute_import_binding_usage(&parser_return.program, &extractor.imports);
291    combined
292        .unused_import_bindings
293        .extend(binding_usage.unused.iter().cloned());
294    combined
295        .type_referenced_import_bindings
296        .extend(binding_usage.type_referenced.iter().cloned());
297    combined
298        .value_referenced_import_bindings
299        .extend(binding_usage.value_referenced.iter().cloned());
300    if need_complexity {
301        combined.complexity.extend(translate_script_complexity(
302            script,
303            &parser_return.program,
304            &combined.line_offsets,
305        ));
306    }
307
308    if is_template_visible_script(kind, script) {
309        template_visible_imports.extend(
310            extractor
311                .imports
312                .iter()
313                .filter(|import| !import.local_name.is_empty())
314                .map(|import| import.local_name.clone()),
315        );
316        template_visible_bound_targets.extend(
317            extractor
318                .binding_target_names()
319                .iter()
320                .filter(|(local, _)| !local.starts_with("this."))
321                .map(|(local, target)| (local.clone(), target.clone())),
322        );
323    }
324
325    extractor.merge_into(combined);
326}
327
328fn translate_script_complexity(
329    script: &SfcScript,
330    program: &oxc_ast::ast::Program<'_>,
331    sfc_line_offsets: &[u32],
332) -> Vec<FunctionComplexity> {
333    let script_line_offsets = compute_line_offsets(&script.body);
334    let mut complexity = crate::complexity::compute_complexity(program, &script_line_offsets);
335    let (body_start_line, body_start_col) =
336        byte_offset_to_line_col(sfc_line_offsets, script.byte_offset as u32);
337
338    for function in &mut complexity {
339        function.line = body_start_line + function.line.saturating_sub(1);
340        if function.line == body_start_line {
341            function.col += body_start_col;
342        }
343    }
344
345    complexity
346}
347
348fn add_script_src_import(module: &mut ModuleInfo, source: &str) {
349    // Normalize bare filenames (e.g., `<script src="logic.ts">`) so the
350    // resolver treats them as file-relative references, not npm packages.
351    module.imports.push(ImportInfo {
352        source: normalize_asset_url(source),
353        imported_name: ImportedName::SideEffect,
354        local_name: String::new(),
355        is_type_only: false,
356        from_style: false,
357        span: Span::default(),
358        source_span: Span::default(),
359    });
360}
361
362/// `lang` attribute values whose body we know how to scan for `@import` /
363/// `@use` / `@forward` directives. Plain `<style>` (no `lang`) is treated as
364/// CSS. `less`, `stylus`, and `postcss` bodies are NOT scanned because their
365/// import syntax differs (`@import (reference)` modifiers, etc.); their
366/// `<style src="...">` references are still seeded.
367fn style_lang_is_scss(lang: Option<&str>) -> bool {
368    matches!(lang, Some("scss" | "sass"))
369}
370
371fn style_lang_is_css_like(lang: Option<&str>) -> bool {
372    lang.is_none() || matches!(lang, Some("css"))
373}
374
375fn merge_style_into_module(style: &SfcStyle, combined: &mut ModuleInfo) {
376    // <style src="./theme.scss"> is symmetric to <script src="...">: seed the
377    // referenced file as a side-effect import. The resolver still applies SCSS
378    // partial / include-path / node_modules fallbacks because `from_style` is
379    // set on the import.
380    if let Some(src) = &style.src {
381        combined.imports.push(ImportInfo {
382            source: normalize_asset_url(src),
383            imported_name: ImportedName::SideEffect,
384            local_name: String::new(),
385            is_type_only: false,
386            from_style: true,
387            span: Span::default(),
388            source_span: Span::default(),
389        });
390    }
391
392    let lang = style.lang.as_deref();
393    let is_scss = style_lang_is_scss(lang);
394    let is_css_like = style_lang_is_css_like(lang);
395    if !is_scss && !is_css_like {
396        return;
397    }
398
399    for spec in crate::css::extract_css_imports(&style.body, is_scss) {
400        combined.imports.push(ImportInfo {
401            source: spec,
402            imported_name: ImportedName::SideEffect,
403            local_name: String::new(),
404            is_type_only: false,
405            from_style: true,
406            span: Span::default(),
407            source_span: Span::default(),
408        });
409    }
410}
411
412fn source_type_for_script(script: &SfcScript) -> SourceType {
413    match (script.is_typescript, script.is_jsx) {
414        (true, true) => SourceType::tsx(),
415        (true, false) => SourceType::ts(),
416        (false, true) => SourceType::jsx(),
417        (false, false) => SourceType::mjs(),
418    }
419}
420
421fn apply_template_usage(
422    kind: SfcKind,
423    source: &str,
424    template_visible_imports: &FxHashSet<String>,
425    template_visible_bound_targets: &FxHashMap<String, String>,
426    combined: &mut ModuleInfo,
427) {
428    if template_visible_imports.is_empty() && template_visible_bound_targets.is_empty() {
429        return;
430    }
431
432    let template_usage = collect_template_usage_with_bound_targets(
433        kind,
434        source,
435        template_visible_imports,
436        template_visible_bound_targets,
437    );
438    combined
439        .unused_import_bindings
440        .retain(|binding| !template_usage.used_bindings.contains(binding));
441    combined
442        .member_accesses
443        .extend(template_usage.member_accesses);
444    combined
445        .whole_object_uses
446        .extend(template_usage.whole_object_uses);
447}
448
449fn is_template_visible_script(kind: SfcKind, script: &SfcScript) -> bool {
450    match kind {
451        SfcKind::Vue => script.is_setup,
452        SfcKind::Svelte => !script.is_context_module,
453    }
454}
455
456// SFC tests exercise regex-based HTML string extraction — no unsafe code,
457// no Miri-specific value. Oxc parser tests are additionally ~1000x slower.
458#[cfg(all(test, not(miri)))]
459mod tests {
460    use super::*;
461
462    // ── is_sfc_file ──────────────────────────────────────────────
463
464    #[test]
465    fn is_sfc_file_vue() {
466        assert!(is_sfc_file(Path::new("App.vue")));
467    }
468
469    #[test]
470    fn is_sfc_file_svelte() {
471        assert!(is_sfc_file(Path::new("Counter.svelte")));
472    }
473
474    #[test]
475    fn is_sfc_file_rejects_ts() {
476        assert!(!is_sfc_file(Path::new("utils.ts")));
477    }
478
479    #[test]
480    fn is_sfc_file_rejects_jsx() {
481        assert!(!is_sfc_file(Path::new("App.jsx")));
482    }
483
484    #[test]
485    fn is_sfc_file_rejects_astro() {
486        assert!(!is_sfc_file(Path::new("Layout.astro")));
487    }
488
489    // ── extract_sfc_scripts: single script block ─────────────────
490
491    #[test]
492    fn single_plain_script() {
493        let scripts = extract_sfc_scripts("<script>const x = 1;</script>");
494        assert_eq!(scripts.len(), 1);
495        assert_eq!(scripts[0].body, "const x = 1;");
496        assert!(!scripts[0].is_typescript);
497        assert!(!scripts[0].is_jsx);
498        assert!(scripts[0].src.is_none());
499    }
500
501    #[test]
502    fn single_ts_script() {
503        let scripts = extract_sfc_scripts(r#"<script lang="ts">const x: number = 1;</script>"#);
504        assert_eq!(scripts.len(), 1);
505        assert!(scripts[0].is_typescript);
506        assert!(!scripts[0].is_jsx);
507    }
508
509    #[test]
510    fn single_tsx_script() {
511        let scripts = extract_sfc_scripts(r#"<script lang="tsx">const el = <div />;</script>"#);
512        assert_eq!(scripts.len(), 1);
513        assert!(scripts[0].is_typescript);
514        assert!(scripts[0].is_jsx);
515    }
516
517    #[test]
518    fn single_jsx_script() {
519        let scripts = extract_sfc_scripts(r#"<script lang="jsx">const el = <div />;</script>"#);
520        assert_eq!(scripts.len(), 1);
521        assert!(!scripts[0].is_typescript);
522        assert!(scripts[0].is_jsx);
523    }
524
525    // ── Multiple script blocks ───────────────────────────────────
526
527    #[test]
528    fn two_script_blocks() {
529        let source = r#"
530<script lang="ts">
531export default {};
532</script>
533<script setup lang="ts">
534const count = 0;
535</script>
536"#;
537        let scripts = extract_sfc_scripts(source);
538        assert_eq!(scripts.len(), 2);
539        assert!(scripts[0].body.contains("export default"));
540        assert!(scripts[1].body.contains("count"));
541    }
542
543    // ── <script setup> ───────────────────────────────────────────
544
545    #[test]
546    fn script_setup_extracted() {
547        let scripts =
548            extract_sfc_scripts(r#"<script setup lang="ts">import { ref } from 'vue';</script>"#);
549        assert_eq!(scripts.len(), 1);
550        assert!(scripts[0].body.contains("import"));
551        assert!(scripts[0].is_typescript);
552    }
553
554    // ── <script src="..."> external script ───────────────────────
555
556    #[test]
557    fn script_src_detected() {
558        let scripts = extract_sfc_scripts(r#"<script src="./component.ts" lang="ts"></script>"#);
559        assert_eq!(scripts.len(), 1);
560        assert_eq!(scripts[0].src.as_deref(), Some("./component.ts"));
561    }
562
563    #[test]
564    fn data_src_not_treated_as_src() {
565        let scripts =
566            extract_sfc_scripts(r#"<script lang="ts" data-src="./nope.ts">const x = 1;</script>"#);
567        assert_eq!(scripts.len(), 1);
568        assert!(scripts[0].src.is_none());
569    }
570
571    // ── HTML comment filtering ───────────────────────────────────
572
573    #[test]
574    fn script_inside_html_comment_filtered() {
575        let source = r#"
576<!-- <script lang="ts">import { bad } from 'bad';</script> -->
577<script lang="ts">import { good } from 'good';</script>
578"#;
579        let scripts = extract_sfc_scripts(source);
580        assert_eq!(scripts.len(), 1);
581        assert!(scripts[0].body.contains("good"));
582    }
583
584    #[test]
585    fn spanning_comment_filters_script() {
586        let source = r#"
587<!-- disabled:
588<script lang="ts">import { bad } from 'bad';</script>
589-->
590<script lang="ts">const ok = true;</script>
591"#;
592        let scripts = extract_sfc_scripts(source);
593        assert_eq!(scripts.len(), 1);
594        assert!(scripts[0].body.contains("ok"));
595    }
596
597    #[test]
598    fn string_containing_comment_markers_not_corrupted() {
599        // A string in the script body containing <!-- should not cause filtering issues
600        let source = r#"
601<script setup lang="ts">
602const marker = "<!-- not a comment -->";
603import { ref } from 'vue';
604</script>
605"#;
606        let scripts = extract_sfc_scripts(source);
607        assert_eq!(scripts.len(), 1);
608        assert!(scripts[0].body.contains("import"));
609    }
610
611    // ── Generic attributes with > in quoted values ───────────────
612
613    #[test]
614    fn generic_attr_with_angle_bracket() {
615        let source =
616            r#"<script setup lang="ts" generic="T extends Foo<Bar>">const x = 1;</script>"#;
617        let scripts = extract_sfc_scripts(source);
618        assert_eq!(scripts.len(), 1);
619        assert_eq!(scripts[0].body, "const x = 1;");
620    }
621
622    #[test]
623    fn nested_generic_attr() {
624        let source = r#"<script setup lang="ts" generic="T extends Map<string, Set<number>>">const x = 1;</script>"#;
625        let scripts = extract_sfc_scripts(source);
626        assert_eq!(scripts.len(), 1);
627        assert_eq!(scripts[0].body, "const x = 1;");
628    }
629
630    // ── lang attribute with single quotes ────────────────────────
631
632    #[test]
633    fn lang_single_quoted() {
634        let scripts = extract_sfc_scripts("<script lang='ts'>const x = 1;</script>");
635        assert_eq!(scripts.len(), 1);
636        assert!(scripts[0].is_typescript);
637    }
638
639    // ── Case-insensitive matching ────────────────────────────────
640
641    #[test]
642    fn uppercase_script_tag() {
643        let scripts = extract_sfc_scripts(r#"<SCRIPT lang="ts">const x = 1;</SCRIPT>"#);
644        assert_eq!(scripts.len(), 1);
645        assert!(scripts[0].is_typescript);
646    }
647
648    // ── Edge cases ───────────────────────────────────────────────
649
650    #[test]
651    fn no_script_block() {
652        let scripts = extract_sfc_scripts("<template><div>Hello</div></template>");
653        assert!(scripts.is_empty());
654    }
655
656    #[test]
657    fn empty_script_body() {
658        let scripts = extract_sfc_scripts(r#"<script lang="ts"></script>"#);
659        assert_eq!(scripts.len(), 1);
660        assert!(scripts[0].body.is_empty());
661    }
662
663    #[test]
664    fn whitespace_only_script() {
665        let scripts = extract_sfc_scripts("<script lang=\"ts\">\n  \n</script>");
666        assert_eq!(scripts.len(), 1);
667        assert!(scripts[0].body.trim().is_empty());
668    }
669
670    #[test]
671    fn byte_offset_is_set() {
672        let source = r#"<template><div/></template><script lang="ts">code</script>"#;
673        let scripts = extract_sfc_scripts(source);
674        assert_eq!(scripts.len(), 1);
675        // The byte_offset should point to where "code" starts in the source
676        let offset = scripts[0].byte_offset;
677        assert_eq!(&source[offset..offset + 4], "code");
678    }
679
680    #[test]
681    fn script_with_extra_attributes() {
682        let scripts = extract_sfc_scripts(
683            r#"<script lang="ts" id="app" type="module" data-custom="val">const x = 1;</script>"#,
684        );
685        assert_eq!(scripts.len(), 1);
686        assert!(scripts[0].is_typescript);
687        assert!(scripts[0].src.is_none());
688    }
689
690    // ── Full parse tests (Oxc parser ~1000x slower under Miri) ──
691
692    #[test]
693    fn multiple_script_blocks_exports_combined() {
694        let source = r#"
695<script lang="ts">
696export const version = '1.0';
697</script>
698<script setup lang="ts">
699import { ref } from 'vue';
700const count = ref(0);
701</script>
702"#;
703        let info = parse_sfc_to_module(FileId(0), Path::new("Dual.vue"), source, 0, false);
704        // The non-setup block exports `version`
705        assert!(
706            info.exports
707                .iter()
708                .any(|e| matches!(&e.name, crate::ExportName::Named(n) if n == "version")),
709            "export from <script> block should be extracted"
710        );
711        // The setup block imports `ref` from 'vue'
712        assert!(
713            info.imports.iter().any(|i| i.source == "vue"),
714            "import from <script setup> block should be extracted"
715        );
716    }
717
718    // ── lang="tsx" detection ────────────────────────────────────
719
720    #[test]
721    fn lang_tsx_detected_as_typescript_jsx() {
722        let scripts =
723            extract_sfc_scripts(r#"<script lang="tsx">const el = <div>{x}</div>;</script>"#);
724        assert_eq!(scripts.len(), 1);
725        assert!(scripts[0].is_typescript, "lang=tsx should be typescript");
726        assert!(scripts[0].is_jsx, "lang=tsx should be jsx");
727    }
728
729    // ── HTML comment filtering of script blocks ─────────────────
730
731    #[test]
732    fn multiline_html_comment_filters_all_script_blocks_inside() {
733        let source = r#"
734<!--
735  This whole section is disabled:
736  <script lang="ts">import { bad1 } from 'bad1';</script>
737  <script lang="ts">import { bad2 } from 'bad2';</script>
738-->
739<script lang="ts">import { good } from 'good';</script>
740"#;
741        let scripts = extract_sfc_scripts(source);
742        assert_eq!(scripts.len(), 1);
743        assert!(scripts[0].body.contains("good"));
744    }
745
746    // ── <script src="..."> generates side-effect import ─────────
747
748    #[test]
749    fn script_src_generates_side_effect_import() {
750        let info = parse_sfc_to_module(
751            FileId(0),
752            Path::new("External.vue"),
753            r#"<script src="./external-logic.ts" lang="ts"></script>"#,
754            0,
755            false,
756        );
757        assert!(
758            info.imports
759                .iter()
760                .any(|i| i.source == "./external-logic.ts"
761                    && matches!(i.imported_name, ImportedName::SideEffect)),
762            "script src should generate a side-effect import"
763        );
764    }
765
766    // ── Additional coverage ─────────────────────────────────────
767
768    #[test]
769    fn parse_sfc_no_script_returns_empty_module() {
770        let info = parse_sfc_to_module(
771            FileId(0),
772            Path::new("Empty.vue"),
773            "<template><div>Hello</div></template>",
774            42,
775            false,
776        );
777        assert!(info.imports.is_empty());
778        assert!(info.exports.is_empty());
779        assert_eq!(info.content_hash, 42);
780        assert_eq!(info.file_id, FileId(0));
781    }
782
783    #[test]
784    fn parse_sfc_has_line_offsets() {
785        let info = parse_sfc_to_module(
786            FileId(0),
787            Path::new("LineOffsets.vue"),
788            r#"<script lang="ts">const x = 1;</script>"#,
789            0,
790            false,
791        );
792        assert!(!info.line_offsets.is_empty());
793    }
794
795    #[test]
796    fn parse_sfc_has_suppressions() {
797        let info = parse_sfc_to_module(
798            FileId(0),
799            Path::new("Suppressions.vue"),
800            r#"<script lang="ts">
801// fallow-ignore-file
802export const foo = 1;
803</script>"#,
804            0,
805            false,
806        );
807        assert!(!info.suppressions.is_empty());
808    }
809
810    #[test]
811    fn source_type_jsx_detection() {
812        let scripts = extract_sfc_scripts(r#"<script lang="jsx">const el = <div />;</script>"#);
813        assert_eq!(scripts.len(), 1);
814        assert!(!scripts[0].is_typescript);
815        assert!(scripts[0].is_jsx);
816    }
817
818    #[test]
819    fn source_type_plain_js_detection() {
820        let scripts = extract_sfc_scripts("<script>const x = 1;</script>");
821        assert_eq!(scripts.len(), 1);
822        assert!(!scripts[0].is_typescript);
823        assert!(!scripts[0].is_jsx);
824    }
825
826    #[test]
827    fn is_sfc_file_rejects_no_extension() {
828        assert!(!is_sfc_file(Path::new("Makefile")));
829    }
830
831    #[test]
832    fn is_sfc_file_rejects_mdx() {
833        assert!(!is_sfc_file(Path::new("post.mdx")));
834    }
835
836    #[test]
837    fn is_sfc_file_rejects_css() {
838        assert!(!is_sfc_file(Path::new("styles.css")));
839    }
840
841    #[test]
842    fn multiple_script_blocks_both_have_offsets() {
843        let source = r#"<script lang="ts">const a = 1;</script>
844<script setup lang="ts">const b = 2;</script>"#;
845        let scripts = extract_sfc_scripts(source);
846        assert_eq!(scripts.len(), 2);
847        // Both scripts should have valid byte offsets
848        let offset0 = scripts[0].byte_offset;
849        let offset1 = scripts[1].byte_offset;
850        assert_eq!(
851            &source[offset0..offset0 + "const a = 1;".len()],
852            "const a = 1;"
853        );
854        assert_eq!(
855            &source[offset1..offset1 + "const b = 2;".len()],
856            "const b = 2;"
857        );
858    }
859
860    #[test]
861    fn script_with_src_and_lang() {
862        // src + lang should both be detected
863        let scripts = extract_sfc_scripts(r#"<script src="./logic.ts" lang="tsx"></script>"#);
864        assert_eq!(scripts.len(), 1);
865        assert_eq!(scripts[0].src.as_deref(), Some("./logic.ts"));
866        assert!(scripts[0].is_typescript);
867        assert!(scripts[0].is_jsx);
868    }
869
870    // ── extract_sfc_styles (issue #195 Case B) ──
871
872    #[test]
873    fn extract_style_block_lang_scss() {
874        let source = r#"<template/><style lang="scss">@import 'Foo';</style>"#;
875        let styles = extract_sfc_styles(source);
876        assert_eq!(styles.len(), 1);
877        assert_eq!(styles[0].lang.as_deref(), Some("scss"));
878        assert!(styles[0].body.contains("@import"));
879        assert!(styles[0].src.is_none());
880    }
881
882    #[test]
883    fn extract_style_block_with_src() {
884        let source = r#"<style src="./theme.scss" lang="scss"></style>"#;
885        let styles = extract_sfc_styles(source);
886        assert_eq!(styles.len(), 1);
887        assert_eq!(styles[0].src.as_deref(), Some("./theme.scss"));
888        assert_eq!(styles[0].lang.as_deref(), Some("scss"));
889    }
890
891    #[test]
892    fn extract_style_block_plain_no_lang() {
893        let source = r"<style>.foo { color: red; }</style>";
894        let styles = extract_sfc_styles(source);
895        assert_eq!(styles.len(), 1);
896        assert!(styles[0].lang.is_none());
897    }
898
899    #[test]
900    fn extract_multiple_style_blocks() {
901        let source = r#"<style lang="scss">@import 'a';</style>
902<style scoped lang="scss">@import 'b';</style>"#;
903        let styles = extract_sfc_styles(source);
904        assert_eq!(styles.len(), 2);
905    }
906
907    #[test]
908    fn style_block_inside_html_comment_filtered() {
909        let source = r#"<!-- <style lang="scss">@import 'bad';</style> -->
910<style lang="scss">@import 'good';</style>"#;
911        let styles = extract_sfc_styles(source);
912        assert_eq!(styles.len(), 1);
913        assert!(styles[0].body.contains("good"));
914    }
915
916    #[test]
917    fn parse_sfc_extracts_style_imports_with_from_style_flag() {
918        let info = parse_sfc_to_module(
919            FileId(0),
920            Path::new("Foo.vue"),
921            r#"<template/><style lang="scss">@import 'Foo';</style>"#,
922            0,
923            false,
924        );
925        let style_import = info
926            .imports
927            .iter()
928            .find(|i| i.source == "./Foo")
929            .expect("scss @import 'Foo' should be normalized to ./Foo");
930        assert!(
931            style_import.from_style,
932            "imports from <style> blocks must carry from_style=true so the resolver \
933             enables SCSS partial fallback for the SFC importer"
934        );
935        assert!(matches!(
936            style_import.imported_name,
937            ImportedName::SideEffect
938        ));
939    }
940
941    #[test]
942    fn parse_sfc_extracts_style_src_with_from_style_flag() {
943        let info = parse_sfc_to_module(
944            FileId(0),
945            Path::new("Bar.vue"),
946            r#"<style src="./Bar.scss" lang="scss"></style>"#,
947            0,
948            false,
949        );
950        let style_src = info
951            .imports
952            .iter()
953            .find(|i| i.source == "./Bar.scss")
954            .expect("<style src=\"./Bar.scss\"> should produce a side-effect import");
955        assert!(style_src.from_style);
956    }
957
958    #[test]
959    fn parse_sfc_skips_unsupported_style_lang_body_but_keeps_src() {
960        // <style lang="postcss"> body is NOT scanned (custom directives); src is still seeded.
961        let info = parse_sfc_to_module(
962            FileId(0),
963            Path::new("Baz.vue"),
964            r#"<style lang="postcss" src="./Baz.pcss">@custom-rule "skipped";</style>"#,
965            0,
966            false,
967        );
968        assert!(
969            info.imports.iter().any(|i| i.source == "./Baz.pcss"),
970            "src reference should still be seeded for unsupported lang"
971        );
972        assert!(
973            !info.imports.iter().any(|i| i.source.contains("skipped")),
974            "postcss body should not be scanned for @import directives"
975        );
976    }
977}
fallow_extract/sfc.rs

fallow_extract/
sfc.rs
