Struct MissingStyleRule

pub struct MissingStyleRule;

Available on crate feature analysis only.

Rule for detecting events that reference undefined styles

Events must reference valid style names defined in the [V4+ Styles] section. Missing style references cause renderers to fall back to default styling, which may not match the intended visual appearance.

Performance

• Time complexity: O(n + m) for n styles and m events
• Memory: O(n) for style name collection
• Target: <1ms for typical scripts with 100 styles and 1000 events

Example

use ass_core::analysis::linting::rules::missing_style::MissingStyleRule;
use ass_core::analysis::linting::LintRule;
use ass_core::{Script, ScriptAnalysis};

let script = Script::parse(r#"
[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,20,&H00FFFFFF&,&H000000FF&,&H00000000&,&H00000000&,0,0,0,0,100,100,0,0,1,2,0,2,10,10,10,1

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:05.00,Undefined,,0,0,0,,Text with undefined style
"#)?;

let analysis = ScriptAnalysis::analyze(&script)?;
let rule = MissingStyleRule;
let issues = rule.check_script(&analysis);
assert!(!issues.is_empty()); // Should detect the missing style reference

Trait Implementations

impl LintRule for MissingStyleRule

fn id(&self) -> &'static str

Unique identifier for this rule.

fn name(&self) -> &'static str

Human-readable name.

fn description(&self) -> &'static str

Rule description.

fn default_severity(&self) -> IssueSeverity

Default severity level.

fn category(&self) -> IssueCategory

Issue category this rule checks for.

fn check_script(&self, analysis: &ScriptAnalysis<'_>) -> Vec<LintIssue>

Check script and return issues.