Struct AccessibilityRule 

pub struct AccessibilityRule;

Available on crate feature analysis only.

Rule for detecting accessibility issues in subtitle scripts

Analyzes scripts for patterns that may negatively impact accessibility, including reading speed, contrast, and timing issues that could make subtitles difficult to follow for users with various needs.

Accessibility Checks

• Display duration: Ensures events are displayed long enough to be readable
• Reading speed: Warns about text that appears/disappears too quickly
• Flash prevention: Detects rapid style changes that could trigger seizures

Performance

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

Example

use ass_core::analysis::linting::rules::accessibility::AccessibilityRule;
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: 0,0:00:00.00,0:00:05.00,Default,,0,0,0,,Text without proper contrast
"#)?;

let analysis = ScriptAnalysis::analyze(&script)?;
let rule = AccessibilityRule;
let issues = rule.check_script(&analysis);

Trait Implementations

impl LintRule for AccessibilityRule

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.