Struct NegativeDurationRule 

pub struct NegativeDurationRule;

Available on crate feature analysis only.

Rule for detecting events with negative or zero duration

Events with start time >= end time are invalid and will not display properly in most subtitle renderers. This rule catches timing errors that could result from manual editing mistakes or conversion issues.

Performance

• Time complexity: O(n) for n events
• Memory: O(1) additional space
• Target: <0.5ms for 1000 events

Example

use ass_core::analysis::linting::rules::negative_duration::NegativeDurationRule;
use ass_core::analysis::linting::LintRule;
use ass_core::{Script, ScriptAnalysis};

let script = Script::parse(r#"
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:05.00,0:00:02.00,Default,,0,0,0,,Invalid event
"#)?;

let analysis = ScriptAnalysis::analyze(&script)?;
let rule = NegativeDurationRule;
let issues = rule.check_script(&analysis);
assert!(!issues.is_empty()); // Should detect the negative duration

Trait Implementations

impl LintRule for NegativeDurationRule

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.