Enum ParseDelta 

pub enum ParseDelta<'a> {
    AddSection(Section<'a>),
    UpdateSection(usize, Section<'a>),
    RemoveSection(usize),
    ParseIssue(String),
}

Available on crate feature stream only.

Delta operations for streaming updates

Represents atomic changes detected during incremental parsing. Used by editors and streaming applications to efficiently update internal state without full re-parsing.

Performance

Deltas use zero-copy design where possible to minimize allocations. Section references point to parsed AST nodes using lifetime parameters.

Example

use ass_core::parser::streaming::ParseDelta;

// Handle delta operations
fn apply_deltas(deltas: Vec<ParseDelta>) {
    for delta in deltas {
        match delta {
            ParseDelta::AddSection(section) => {
                // Add new section to document
            }
            ParseDelta::UpdateSection(index, section) => {
                // Update existing section
            }
            ParseDelta::RemoveSection(index) => {
                // Remove section at index
            }
            ParseDelta::ParseIssue(issue) => {
                // Handle parsing error/warning
            }
        }
    }
}

Variants

AddSection(Section<'a>)

Section was added to the script

Contains the complete parsed section with zero-copy references to source text spans.

UpdateSection(usize, Section<'a>)

Section was modified during incremental parsing

Contains the section index and updated section data. Consumers should replace the existing section at the specified index with this new data.

RemoveSection(usize)

Section was removed by index

Contains the zero-based index of the section that should be removed from the script.

ParseIssue(String)

Parsing issue detected during processing

Contains error or warning message about parsing problems. Parsing may continue despite issues for error recovery.

Implementations

impl<'a> ParseDelta<'a>

pub const fn add_section(section: Section<'a>) -> Self

Create delta for adding a section

pub const fn update_section(index: usize, section: Section<'a>) -> Self

Create delta for updating a section

pub const fn remove_section(index: usize) -> Self

Create delta for removing a section by index

pub const fn parse_issue(message: String) -> Self

Create delta for parsing issue

pub const fn is_error(&self) -> bool

Check if delta represents an error condition

pub const fn is_structural(&self) -> bool

Check if delta modifies document structure

pub const fn section(&self) -> Option<&Section<'a>>

Get section reference if delta contains one

Trait Implementations

impl<'a> Clone for ParseDelta<'a>

fn clone(&self) -> ParseDelta<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for ParseDelta<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> FromIterator<ParseDelta<'a>> for DeltaBatch<'a>

fn from_iter<T: IntoIterator<Item = ParseDelta<'a>>>(iter: T) -> Self

Creates a value from an iterator.