Module parser 

ASS script parser module

Provides zero-copy parsing of ASS subtitle scripts with lifetime-generic AST nodes. Supports full ASS v4+, SSA v4 compatibility, and libass 0.17.4+ extensions.

Performance

• Target: <5ms parsing for typical 1KB scripts
• Memory: ~1.1x input size via zero-copy spans
• Incremental updates: <2ms for single-event changes

Example

use ass_core::parser::Script;
use ass_core::CoreError;

let script_text = r#"
[Script Info]
Title: Example
ScriptType: v4.00+

[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,,Hello World!
"#;

let script = Script::parse(script_text)?;
assert_eq!(script.sections().len(), 2);

Re-exports

pub use ast::Event;

pub use ast::ScriptInfo;

pub use ast::Section;

pub use ast::SectionType;

pub use ast::Style;

pub use errors::IssueCategory;

pub use errors::IssueSeverity;

pub use errors::ParseError;

pub use errors::ParseIssue;

pub use errors::ParseResult;

pub use script::Script;

pub use script::calculate_delta;stream

pub use script::ScriptDelta;stream

pub use script::ScriptDeltaOwned;stream

pub use streaming::build_modified_source;stream

Modules

ast

AST (Abstract Syntax Tree) definitions for ASS scripts

binary_data

Binary data parsing for [Fonts] and [Graphics] sections

errors

Parser error types for ASS script parsing

incremental

Incremental parsing utilities for efficient text updates

main

Main parser coordination and dispatch logic

position_tracker

Position tracking utilities for incremental parsing

script

ASS script container with zero-copy lifetime-generic design

sections

Section-specific parsers for ASS script components.

streamingstream

Streaming and incremental parsing for ASS scripts