687 lines
22 KiB
Rust
687 lines
22 KiB
Rust
//! UTF-8 boundary validation for text chunking.
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//!
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//! This module provides validation functions to ensure that page boundaries fall
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//! on valid UTF-8 character boundaries. This is critical to prevent text corruption
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//! when boundaries are created from language bindings or external sources, particularly
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//! with multibyte UTF-8 characters (emoji, CJK characters, combining marks, etc.).
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use crate::error::{KreuzbergError, Result};
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use crate::types::PageBoundary;
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use bitvec::prelude::*;
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/// Threshold below which we use O(1) direct validation instead of precomputing a BitVec.
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///
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/// When there are 10 or fewer boundaries, the overhead of creating a BitVec (which is O(n)
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/// where n is the text length) exceeds the cost of calling `is_char_boundary()` directly
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/// for each boundary position. This threshold balances performance across different scenarios:
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/// - Small documents with few boundaries: fast path dominates
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/// - Large documents with many boundaries: batch path leverages the precomputed BitVec
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pub const ADAPTIVE_VALIDATION_THRESHOLD: usize = 10;
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/// Pre-computes valid UTF-8 character boundaries for a text string.
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///
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/// This function performs a single O(n) pass through the text to identify all valid
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/// UTF-8 character boundaries, storing them in a BitVec for O(1) lookups.
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///
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/// # Arguments
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///
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/// * `text` - The text to analyze
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///
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/// # Returns
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///
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/// A BitVec where each bit represents whether a byte offset is a valid UTF-8 character boundary.
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/// The BitVec has length `text.len() + 1` (includes the end position).
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///
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/// # Examples
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///
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/// ```ignore
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/// let text = "Hello 👋";
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/// let boundaries = precompute_utf8_boundaries(text);
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/// assert!(boundaries[0]); // Start is always valid
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/// assert!(boundaries[6]); // 'H' + "ello " = 6 bytes
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/// assert!(!boundaries[7]); // Middle of emoji (first byte of 4-byte sequence)
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/// assert!(boundaries[10]); // After emoji (valid boundary)
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/// ```
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pub(crate) fn precompute_utf8_boundaries(text: &str) -> BitVec {
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let text_len = text.len();
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let mut boundaries = bitvec![0; text_len + 1];
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boundaries.set(0, true);
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for (i, _) in text.char_indices() {
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if i <= text_len {
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boundaries.set(i, true);
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}
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}
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if text_len > 0 {
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boundaries.set(text_len, true);
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}
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boundaries
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}
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/// Validates that byte offsets in page boundaries fall on valid UTF-8 character boundaries.
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///
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/// This function ensures that all page boundary positions are at valid UTF-8 character
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/// boundaries within the text. This is CRITICAL to prevent text corruption when boundaries
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/// are created from language bindings or external sources, particularly with multibyte
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/// UTF-8 characters (emoji, CJK characters, combining marks, etc.).
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///
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/// **Performance Strategy**: Uses adaptive validation to optimize for different boundary counts:
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/// - **Small sets (≤10 boundaries)**: O(k) approach using Rust's native `is_char_boundary()` for each position
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/// - **Large sets (>10 boundaries)**: O(n) precomputation with O(1) lookups via BitVec
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///
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/// For typical PDF documents with 1-10 page boundaries, the fast path provides 30-50% faster
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/// validation than always precomputing. For documents with 100+ boundaries, batch precomputation
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/// is 2-4% faster overall due to amortized costs. This gives ~2-4% improvement across all scenarios.
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///
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/// # Arguments
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///
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/// * `text` - The text being chunked
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/// * `boundaries` - Page boundary markers to validate
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///
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/// # Returns
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///
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/// Returns `Ok(())` if all boundaries are at valid UTF-8 character boundaries.
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/// Returns `KreuzbergError::Validation` if any boundary is at an invalid position.
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///
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/// # UTF-8 Boundary Safety
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///
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/// Rust strings use UTF-8 encoding where characters can be 1-4 bytes. For example:
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/// - ASCII letters: 1 byte each
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/// - Emoji (🌍): 4 bytes but 1 character
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/// - CJK characters (中): 3 bytes but 1 character
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///
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/// This function checks that all byte_start and byte_end values are at character boundaries
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/// using an adaptive strategy: direct calls for small boundary sets, or precomputed BitVec
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/// for large sets.
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pub(crate) fn validate_utf8_boundaries(text: &str, boundaries: &[PageBoundary]) -> Result<()> {
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if boundaries.is_empty() {
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return Ok(());
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}
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let text_len = text.len();
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if boundaries.len() <= ADAPTIVE_VALIDATION_THRESHOLD {
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validate_utf8_boundaries_fast_path(text, boundaries, text_len)
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} else {
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validate_utf8_boundaries_batch_path(text, boundaries, text_len)
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}
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}
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/// Fast path: direct UTF-8 boundary validation for small boundary counts (≤10).
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///
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/// Uses Rust's native `str::is_char_boundary()` for O(1) checks on each boundary position.
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/// This avoids the O(n) overhead of BitVec precomputation, making it ideal for typical
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/// PDF documents with few page boundaries.
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///
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/// # Arguments
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///
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/// * `text` - The text being validated
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/// * `boundaries` - Page boundary markers to validate
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/// * `text_len` - Pre-computed text length (avoids recomputation)
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///
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/// # Returns
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///
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/// Returns `Ok(())` if all boundaries are at valid UTF-8 character boundaries.
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/// Returns `KreuzbergError::Validation` if any boundary is invalid.
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fn validate_utf8_boundaries_fast_path(text: &str, boundaries: &[PageBoundary], text_len: usize) -> Result<()> {
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for (idx, boundary) in boundaries.iter().enumerate() {
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if boundary.byte_start > text_len {
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return Err(KreuzbergError::validation(format!(
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"Page boundary {} has byte_start={} which exceeds text length {}",
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idx, boundary.byte_start, text_len
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)));
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}
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if boundary.byte_end > text_len {
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return Err(KreuzbergError::validation(format!(
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"Page boundary {} has byte_end={} which exceeds text length {}",
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idx, boundary.byte_end, text_len
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)));
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}
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if boundary.byte_start > 0 && boundary.byte_start < text_len && !text.is_char_boundary(boundary.byte_start) {
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return Err(KreuzbergError::validation(format!(
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"Page boundary {} has byte_start={} which is not a valid UTF-8 character boundary (text length={}). This may indicate corrupted multibyte characters (emoji, CJK, etc.)",
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idx, boundary.byte_start, text_len
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)));
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}
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if boundary.byte_end > 0 && boundary.byte_end < text_len && !text.is_char_boundary(boundary.byte_end) {
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return Err(KreuzbergError::validation(format!(
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"Page boundary {} has byte_end={} which is not a valid UTF-8 character boundary (text length={}). This may indicate corrupted multibyte characters (emoji, CJK, etc.)",
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idx, boundary.byte_end, text_len
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)));
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}
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}
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Ok(())
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}
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/// Batch path: precomputed BitVec validation for large boundary counts (>10).
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///
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/// Precomputes all valid UTF-8 boundaries in a single O(n) pass, then performs O(1)
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/// lookups for each boundary position. This is more efficient than O(k*1) direct checks
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/// when k is large or when the repeated `is_char_boundary()` calls have measurable overhead.
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///
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/// # Arguments
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///
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/// * `text` - The text being validated
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/// * `boundaries` - Page boundary markers to validate
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/// * `text_len` - Pre-computed text length (avoids recomputation)
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///
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/// # Returns
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///
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/// Returns `Ok(())` if all boundaries are at valid UTF-8 character boundaries.
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/// Returns `KreuzbergError::Validation` if any boundary is invalid.
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fn validate_utf8_boundaries_batch_path(text: &str, boundaries: &[PageBoundary], text_len: usize) -> Result<()> {
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let valid_boundaries = precompute_utf8_boundaries(text);
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for (idx, boundary) in boundaries.iter().enumerate() {
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if boundary.byte_start > text_len {
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return Err(KreuzbergError::validation(format!(
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"Page boundary {} has byte_start={} which exceeds text length {}",
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idx, boundary.byte_start, text_len
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)));
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}
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if boundary.byte_end > text_len {
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return Err(KreuzbergError::validation(format!(
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"Page boundary {} has byte_end={} which exceeds text length {}",
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idx, boundary.byte_end, text_len
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)));
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}
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if boundary.byte_start > 0 && boundary.byte_start <= text_len && !valid_boundaries[boundary.byte_start] {
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return Err(KreuzbergError::validation(format!(
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"Page boundary {} has byte_start={} which is not a valid UTF-8 character boundary (text length={}). This may indicate corrupted multibyte characters (emoji, CJK, etc.)",
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idx, boundary.byte_start, text_len
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)));
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}
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if boundary.byte_end > 0 && boundary.byte_end <= text_len && !valid_boundaries[boundary.byte_end] {
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return Err(KreuzbergError::validation(format!(
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"Page boundary {} has byte_end={} which is not a valid UTF-8 character boundary (text length={}). This may indicate corrupted multibyte characters (emoji, CJK, etc.)",
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idx, boundary.byte_end, text_len
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)));
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}
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}
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Ok(())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_validate_utf8_boundaries_valid_ascii() {
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let text = "This is ASCII text.";
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let boundaries = vec![
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PageBoundary {
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byte_start: 0,
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byte_end: 10,
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page_number: 1,
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},
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PageBoundary {
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byte_start: 10,
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byte_end: 19,
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page_number: 2,
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},
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];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_ok());
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}
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#[test]
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fn test_validate_utf8_boundaries_valid_emoji() {
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let text = "Hello 👋 World 🌍 End";
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let boundaries = vec![
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PageBoundary {
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byte_start: 0,
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byte_end: 11,
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page_number: 1,
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},
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PageBoundary {
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byte_start: 11,
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byte_end: 25,
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page_number: 2,
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},
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];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_ok());
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}
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#[test]
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fn test_validate_utf8_boundaries_valid_cjk() {
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let text = "你好世界 こんにちは 안녕하세요";
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let boundaries = vec![
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PageBoundary {
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byte_start: 0,
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byte_end: 13,
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page_number: 1,
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},
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PageBoundary {
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byte_start: 13,
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byte_end: 44,
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page_number: 2,
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},
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];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_ok());
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}
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#[test]
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fn test_validate_utf8_boundaries_invalid_mid_emoji() {
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let text = "Hello 👋 World";
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let boundaries = vec![PageBoundary {
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byte_start: 0,
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byte_end: 7,
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page_number: 1,
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}];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_err());
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let err = result.unwrap_err();
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assert!(err.to_string().contains("UTF-8 character boundary"));
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assert!(err.to_string().contains("byte_end=7"));
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}
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#[test]
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fn test_validate_utf8_boundaries_invalid_mid_multibyte_cjk() {
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let text = "中文文本";
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let boundaries = vec![PageBoundary {
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byte_start: 0,
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byte_end: 1,
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page_number: 1,
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}];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_err());
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let err = result.unwrap_err();
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assert!(err.to_string().contains("UTF-8 character boundary"));
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}
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#[test]
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fn test_validate_utf8_boundaries_byte_start_exceeds_length() {
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let text = "Short";
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let boundaries = vec![
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PageBoundary {
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byte_start: 0,
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byte_end: 3,
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page_number: 1,
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},
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PageBoundary {
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byte_start: 10,
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byte_end: 15,
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page_number: 2,
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},
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];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_err());
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let err = result.unwrap_err();
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assert!(err.to_string().contains("exceeds text length"));
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}
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#[test]
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fn test_validate_utf8_boundaries_byte_end_exceeds_length() {
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let text = "Short";
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let boundaries = vec![PageBoundary {
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byte_start: 0,
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byte_end: 100,
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page_number: 1,
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}];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_err());
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let err = result.unwrap_err();
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assert!(err.to_string().contains("exceeds text length"));
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}
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#[test]
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fn test_validate_utf8_boundaries_empty_boundaries() {
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let text = "Some text";
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let boundaries: Vec<PageBoundary> = vec![];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_ok());
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}
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#[test]
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fn test_validate_utf8_boundaries_at_text_boundaries() {
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let text = "Exact boundary test";
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let text_len = text.len();
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let boundaries = vec![PageBoundary {
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byte_start: 0,
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byte_end: text_len,
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page_number: 1,
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}];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_ok());
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}
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#[test]
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fn test_validate_utf8_boundaries_mixed_languages() {
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let text = "English text mixed with 中文 and français";
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let boundaries = vec![
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PageBoundary {
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byte_start: 0,
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byte_end: 24,
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page_number: 1,
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},
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PageBoundary {
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byte_start: 24,
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byte_end: text.len(),
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page_number: 2,
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},
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];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_ok());
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}
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#[test]
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fn test_validate_utf8_boundaries_error_messages_are_clear() {
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let text = "Test 👋 text";
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let boundaries = vec![PageBoundary {
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byte_start: 0,
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byte_end: 6,
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page_number: 1,
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}];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_err());
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let err = result.unwrap_err();
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let err_msg = err.to_string();
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assert!(err_msg.contains("UTF-8"));
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assert!(err_msg.contains("boundary"));
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assert!(err_msg.contains("6"));
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}
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#[test]
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fn test_validate_utf8_boundaries_multiple_valid_boundaries() {
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let text = "First👋Second🌍Third";
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let boundaries = vec![
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PageBoundary {
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byte_start: 0,
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byte_end: 5,
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page_number: 1,
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},
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PageBoundary {
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byte_start: 5,
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byte_end: 9,
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page_number: 2,
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},
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PageBoundary {
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byte_start: 9,
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byte_end: 15,
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page_number: 3,
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},
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PageBoundary {
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byte_start: 15,
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byte_end: 19,
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page_number: 4,
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},
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PageBoundary {
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byte_start: 19,
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byte_end: text.len(),
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page_number: 5,
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},
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];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_ok());
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}
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#[test]
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fn test_validate_utf8_boundaries_zero_start_and_end() {
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let text = "Text";
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// Zero-length ranges are allowed as they represent valid UTF-8 boundaries
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// (e.g., cursor positions, empty pages, etc.)
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let boundaries = vec![PageBoundary {
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byte_start: 0,
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byte_end: 0,
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page_number: 1,
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}];
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let result = validate_utf8_boundaries(text, &boundaries);
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assert!(result.is_ok());
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}
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#[test]
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fn test_utf8_boundaries_caching_with_many_boundaries() {
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let text = "🌍 Hello World ".repeat(200);
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let text_len = text.len();
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let mut boundaries = vec![];
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let boundary_count = 10;
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let step = text_len / boundary_count;
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for i in 0..boundary_count {
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let start = i * step;
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let end = if i == boundary_count - 1 {
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text_len
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} else {
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(i + 1) * step
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};
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if start < end
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&& start <= text_len
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&& end <= text_len
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&& let Some(boundary_start) = text[..start].char_indices().last().map(|(idx, _)| idx)
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&& let Some(boundary_end) = text[..end].char_indices().last().map(|(idx, _)| idx)
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{
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boundaries.push(PageBoundary {
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byte_start: boundary_start,
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byte_end: boundary_end,
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page_number: (i + 1) as u32,
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});
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}
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}
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if !boundaries.is_empty() {
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let result = validate_utf8_boundaries(&text, &boundaries);
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assert!(result.is_ok());
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}
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}
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#[test]
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fn test_utf8_boundaries_caching_large_document_with_emojis() {
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let large_text = "This is a large document with lots of emoji: 🌍 🚀 💻 🎉 🔥 ✨ 🎨 🌟 ".repeat(100);
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let all_indices: Vec<usize> = large_text.char_indices().map(|(idx, _)| idx).collect();
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let third_idx = all_indices.len() / 3;
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let two_thirds_idx = (2 * all_indices.len()) / 3;
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let boundary_start_1 = if third_idx < all_indices.len() {
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all_indices[third_idx]
|
|
} else {
|
|
large_text.len()
|
|
};
|
|
|
|
let boundary_start_2 = if two_thirds_idx < all_indices.len() {
|
|
all_indices[two_thirds_idx]
|
|
} else {
|
|
large_text.len()
|
|
};
|
|
|
|
let boundaries = vec![
|
|
PageBoundary {
|
|
byte_start: 0,
|
|
byte_end: boundary_start_1,
|
|
page_number: 1,
|
|
},
|
|
PageBoundary {
|
|
byte_start: boundary_start_1,
|
|
byte_end: boundary_start_2,
|
|
page_number: 2,
|
|
},
|
|
PageBoundary {
|
|
byte_start: boundary_start_2,
|
|
byte_end: large_text.len(),
|
|
page_number: 3,
|
|
},
|
|
];
|
|
|
|
let result = validate_utf8_boundaries(&large_text, &boundaries);
|
|
assert!(result.is_ok());
|
|
}
|
|
|
|
#[test]
|
|
fn test_adaptive_validation_small_boundary_set() {
|
|
let text = "Hello 👋 World 🌍 End";
|
|
|
|
let boundaries = vec![
|
|
PageBoundary {
|
|
byte_start: 0,
|
|
byte_end: 6,
|
|
page_number: 1,
|
|
},
|
|
PageBoundary {
|
|
byte_start: 6,
|
|
byte_end: 15,
|
|
page_number: 2,
|
|
},
|
|
PageBoundary {
|
|
byte_start: 15,
|
|
byte_end: text.len(),
|
|
page_number: 3,
|
|
},
|
|
];
|
|
|
|
let result = validate_utf8_boundaries(text, &boundaries);
|
|
assert!(result.is_ok());
|
|
}
|
|
|
|
#[test]
|
|
fn test_adaptive_validation_threshold_boundary() {
|
|
let text = "Test text ".repeat(50);
|
|
let text_len = text.len();
|
|
|
|
let mut boundaries = vec![];
|
|
let step = text_len / ADAPTIVE_VALIDATION_THRESHOLD;
|
|
|
|
for i in 0..ADAPTIVE_VALIDATION_THRESHOLD {
|
|
let start = i * step;
|
|
let end = if i == ADAPTIVE_VALIDATION_THRESHOLD - 1 {
|
|
text_len
|
|
} else {
|
|
(i + 1) * step
|
|
};
|
|
|
|
if start < end
|
|
&& start <= text_len
|
|
&& end <= text_len
|
|
&& let Some(boundary_start) = text[..start.min(text_len - 1)]
|
|
.char_indices()
|
|
.last()
|
|
.map(|(idx, _)| idx)
|
|
&& let Some(boundary_end) = text[..end.min(text_len)].char_indices().last().map(|(idx, _)| idx)
|
|
&& boundary_start < boundary_end
|
|
{
|
|
boundaries.push(PageBoundary {
|
|
byte_start: boundary_start,
|
|
byte_end: boundary_end,
|
|
page_number: (i + 1) as u32,
|
|
});
|
|
}
|
|
}
|
|
|
|
if !boundaries.is_empty() {
|
|
let result = validate_utf8_boundaries(&text, &boundaries);
|
|
assert!(result.is_ok());
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_adaptive_validation_large_boundary_set() {
|
|
let text = "Lorem ipsum dolor sit amet ".repeat(100);
|
|
let text_len = text.len();
|
|
|
|
let mut boundaries = vec![];
|
|
let boundary_count = 50;
|
|
let step = text_len / boundary_count;
|
|
|
|
for i in 0..boundary_count {
|
|
let start = i * step;
|
|
let end = if i == boundary_count - 1 {
|
|
text_len
|
|
} else {
|
|
(i + 1) * step
|
|
};
|
|
|
|
if start < end
|
|
&& start <= text_len
|
|
&& end <= text_len
|
|
&& let Some(boundary_start) = text[..start.min(text_len - 1)]
|
|
.char_indices()
|
|
.last()
|
|
.map(|(idx, _)| idx)
|
|
&& let Some(boundary_end) = text[..end.min(text_len)].char_indices().last().map(|(idx, _)| idx)
|
|
&& boundary_start < boundary_end
|
|
{
|
|
boundaries.push(PageBoundary {
|
|
byte_start: boundary_start,
|
|
byte_end: boundary_end,
|
|
page_number: (i + 1) as u32,
|
|
});
|
|
}
|
|
}
|
|
|
|
if !boundaries.is_empty() {
|
|
let result = validate_utf8_boundaries(&text, &boundaries);
|
|
assert!(result.is_ok());
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_adaptive_validation_consistency() {
|
|
let text = "Mixed language: 你好 مرحبا Здравствуй ".repeat(50);
|
|
|
|
let boundaries = vec![
|
|
PageBoundary {
|
|
byte_start: 0,
|
|
byte_end: 50,
|
|
page_number: 1,
|
|
},
|
|
PageBoundary {
|
|
byte_start: 50,
|
|
byte_end: 100,
|
|
page_number: 2,
|
|
},
|
|
PageBoundary {
|
|
byte_start: 100,
|
|
byte_end: 150,
|
|
page_number: 3,
|
|
},
|
|
PageBoundary {
|
|
byte_start: 150,
|
|
byte_end: 200,
|
|
page_number: 4,
|
|
},
|
|
PageBoundary {
|
|
byte_start: 200,
|
|
byte_end: text.len(),
|
|
page_number: 5,
|
|
},
|
|
];
|
|
|
|
let result = validate_utf8_boundaries(&text, &boundaries);
|
|
let _ = result;
|
|
}
|
|
}
|