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use super::Chunker;
use crate::config::{MultilineConfig, MultilineStrategy};
use regex::Regex;
/// Multi-line chunker that implements various strategies for detecting event boundaries
pub struct MultilineChunker {
config: MultilineConfig,
buffer: Vec<String>,
regex: Option<Regex>,
}
impl MultilineChunker {
pub fn new(config: MultilineConfig) -> Result<Self, String> {
let regex = match &config.strategy {
MultilineStrategy::Timestamp { pattern } => {
Some(Regex::new(pattern).map_err(|e| format!("Invalid timestamp regex: {}", e))?)
}
MultilineStrategy::Start { pattern } => {
Some(Regex::new(pattern).map_err(|e| format!("Invalid start regex: {}", e))?)
}
MultilineStrategy::End { pattern } => {
Some(Regex::new(pattern).map_err(|e| format!("Invalid end regex: {}", e))?)
}
MultilineStrategy::Boundary { start, end: _ } => {
// We'll compile both patterns, but store start pattern here
Some(
Regex::new(start)
.map_err(|e| format!("Invalid boundary start regex: {}", e))?,
)
}
MultilineStrategy::Whole => None,
_ => None,
};
Ok(Self {
config,
buffer: Vec::new(),
regex,
})
}
/// Check if this line starts a new event based on the strategy
fn starts_new_event(&self, line: &str) -> bool {
match &self.config.strategy {
MultilineStrategy::Timestamp { .. } => {
if let Some(ref regex) = self.regex {
regex.is_match(line)
} else {
false
}
}
MultilineStrategy::Indent {
spaces,
tabs,
mixed,
} => {
// A new event starts when the line is NOT indented
!self.is_indented(line, *spaces, *tabs, *mixed)
}
MultilineStrategy::Start { .. } => {
if let Some(ref regex) = self.regex {
regex.is_match(line)
} else {
false
}
}
MultilineStrategy::End { .. } => {
// For end strategy, we look at the previous line in the buffer
false // New events don't start based on current line
}
MultilineStrategy::Boundary { .. } => {
if let Some(ref regex) = self.regex {
regex.is_match(line)
} else {
false
}
}
MultilineStrategy::Backslash { .. } => {
// New events start when previous line doesn't end with continuation char
false // Logic handled elsewhere
}
MultilineStrategy::Whole => {
// Whole strategy never starts new events during feed - everything gets buffered
false
}
}
}
/// Check if this line ends the current event based on the strategy
fn ends_current_event(&self, line: &str) -> bool {
match &self.config.strategy {
MultilineStrategy::End { pattern: _ } => {
if let Some(ref regex) = self.regex {
regex.is_match(line)
} else {
false
}
}
MultilineStrategy::Boundary { end, .. } => {
if let Ok(end_regex) = Regex::new(end) {
end_regex.is_match(line)
} else {
false
}
}
MultilineStrategy::Backslash { char } => {
// Event continues if line ends with continuation character (ignoring trailing newlines)
let trimmed = line.trim_end_matches('\n').trim_end_matches('\r');
!trimmed.ends_with(*char)
}
MultilineStrategy::Whole => {
// Whole strategy never ends current event during feed - everything gets buffered
false
}
_ => false,
}
}
/// Check if a line is indented according to the indent strategy
fn is_indented(&self, line: &str, spaces: Option<u32>, tabs: bool, mixed: bool) -> bool {
if line.is_empty() {
return false; // Empty lines are not considered indented
}
if mixed {
// Any whitespace counts as indentation
line.starts_with(' ') || line.starts_with('\t')
} else if tabs {
// Only tabs count
line.starts_with('\t')
} else if let Some(min_spaces) = spaces {
// Specific number of spaces required
let leading_spaces = line.chars().take_while(|&c| c == ' ').count() as u32;
leading_spaces >= min_spaces
} else {
// Default: any space-based indentation
line.starts_with(' ')
}
}
/// Flush the current buffer and return the event
fn flush_buffer(&mut self) -> Option<String> {
if self.buffer.is_empty() {
None
} else {
// For "whole" strategy, preserve line structure with newlines
// For other strategies, lines already contain newlines, so join with empty string to avoid double newlines
let result = match &self.config.strategy {
MultilineStrategy::Whole => {
// Join with newlines to preserve line structure for whole file reading
Some(self.buffer.join("\n"))
}
_ => {
// Lines already contain newlines for other strategies
Some(self.buffer.join(""))
}
};
self.buffer.clear();
result
}
}
}
impl Chunker for MultilineChunker {
fn feed_line(&mut self, line: String) -> Option<String> {
// Whole strategy always buffers everything and never returns content during feed
if let MultilineStrategy::Whole = &self.config.strategy {
self.buffer.push(line);
return None;
}
// Backslash strategy has different logic - we need to add the line first,
// then check if the event should end
if let MultilineStrategy::Backslash { .. } = &self.config.strategy {
// Add the line to buffer first
self.buffer.push(line);
// Check if this line (the one we just added) ends the event
if let Some(last_line) = self.buffer.last() {
if self.ends_current_event(last_line) {
// Event is complete, flush the buffer
return self.flush_buffer();
}
}
// Event continues, return None
return None;
}
// For all other strategies, use the original logic
let should_flush = match &self.config.strategy {
MultilineStrategy::End { .. } | MultilineStrategy::Boundary { .. } => {
// For end/boundary strategies, check if current line ends the event
self.ends_current_event(&line)
}
_ => {
// For timestamp, indent, and start strategies, check if current line starts a new event
!self.buffer.is_empty() && self.starts_new_event(&line)
}
};
let result = if should_flush {
self.flush_buffer()
} else {
None
};
// Add the new line to buffer
self.buffer.push(line);
result
}
fn flush(&mut self) -> Option<String> {
self.flush_buffer()
}
}
/// Create a chunker based on multiline configuration
pub fn create_multiline_chunker(config: &MultilineConfig) -> Result<Box<dyn Chunker>, String> {
let chunker = MultilineChunker::new(config.clone())?;
Ok(Box::new(chunker))
}