perf(core): linear mmap VHI rebuild + zero-alloc wrap helpers
Four changes that compound to a 2-5x speedup on VHI rebuild for large files, plus eliminating one full wasted VHI pass on initial open. * spawn_indexer no longer computes VHI inline (progressive_reader.rs). The inline VHI used a hardcoded width=80, was invalidated immediately on Loading->Ready transition (gutter digit-boundary), and triggered a second full rebuild. Now returns visual_height_index: None and lets the UI trigger one rebuild with the correct post-layout width. * spawn_visual_height_rebuild rewritten as a single linear pass over mmap bytes using memchr::memchr (SIMD) to find newlines, replacing the byte-by-byte BufRead::read_until scan. Cancel check throttled to every 1MB instead of per-line. * wrap_line_count(&str, width) -> usize added as a zero-allocation counterpart to wrap_line_chars. Property tests cover ASCII, CJK, emoji, combining marks, tabs, zero-width chars, control chars, and real log lines across many widths - all match wrap_line_chars().len() exactly. compute_text_visual_height now uses wrap_line_count, removing 10M Vec allocations on a 10M-line file. * format_json_line returns Cow<'_, str> instead of String. Non-JSON lines borrow the input (zero allocation); only pretty-printed JSON objects allocate. Removes another 10M allocations when json_format=true. Removes now-unused compute_visual_heights (only caller was the deleted inline VHI path).
This commit is contained in:
dailz
+194
-12
@@ -1,3 +1,5 @@
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use std::borrow::Cow;
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/// Maximum input length for wrap/format operations (10 MB).
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/// Callers should check against this constant before invoking `wrap_line_chars`
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/// to avoid pathological cases on oversized lines.
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@@ -69,21 +71,81 @@ pub fn wrap_line_chars(line: &str, width: usize) -> Vec<String> {
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result
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}
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/// Format a line as pretty-printed JSON if it's a JSON Object.
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/// Returns the original line unchanged for non-JSON or non-Object content.
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pub fn format_json_line(line: &str) -> String {
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if line.trim().is_empty() {
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return String::new();
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/// Count wrapped rows for a line without allocating the wrapped strings.
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/// MUST produce the same count as `wrap_line_chars(line, width).len()`.
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pub fn wrap_line_count(line: &str, width: usize) -> usize {
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use unicode_width::UnicodeWidthChar;
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if width == 0 || line.is_empty() {
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return 1;
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}
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// Quick pre-check: only try parsing if it starts with '{'
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if !line.trim_start().starts_with('{') {
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return line.to_string();
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let mut count = 0usize;
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let mut col = 0usize;
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let mut row_has_content = false;
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for ch in line.chars() {
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if ch == '\t' {
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let tab_stop = TAB_WIDTH - (col % TAB_WIDTH);
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let mut remaining = tab_stop;
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while remaining > 0 {
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let avail = width.saturating_sub(col);
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let fill = remaining.min(avail);
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col += fill;
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remaining -= fill;
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if col >= width {
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count += 1;
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col = 0;
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row_has_content = false;
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} else {
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row_has_content = true;
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}
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}
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} else {
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let w = if ch.is_control() {
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0
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} else {
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ch.width().unwrap_or(0)
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};
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if col + w > width && row_has_content {
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count += 1;
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col = 0;
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}
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col += w;
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if col >= width {
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count += 1;
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col = 0;
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row_has_content = false;
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} else {
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row_has_content = true;
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}
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}
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}
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if row_has_content {
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count += 1;
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}
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if count == 0 {
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count = 1;
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}
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count
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}
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/// Format a line as pretty-printed JSON if it's a JSON Object.
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/// Returns the original line borrowed for non-JSON or non-Object content,
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/// only allocating when pretty-printing actually happens.
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pub fn format_json_line(line: &str) -> Cow<'_, str> {
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let trimmed = line.trim();
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if trimmed.is_empty() {
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return Cow::Borrowed("");
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}
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if !trimmed.starts_with('{') {
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return Cow::Borrowed(line);
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}
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match serde_json::from_str::<serde_json::Value>(line) {
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Ok(value) if value.is_object() => {
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serde_json::to_string_pretty(&value).unwrap_or_else(|_| line.to_string())
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}
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_ => line.to_string(),
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Ok(value) if value.is_object() => match serde_json::to_string_pretty(&value) {
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Ok(s) => Cow::Owned(s),
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Err(_) => Cow::Borrowed(line),
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},
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_ => Cow::Borrowed(line),
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}
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}
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@@ -231,4 +293,124 @@ mod tests {
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let result = wrap_line_chars("ab\t", 4);
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assert_eq!(result, vec!["ab "]);
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}
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#[test]
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fn test_wrap_count_matches_chars_empty() {
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assert_eq!(wrap_line_count("", 80), wrap_line_chars("", 80).len());
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}
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#[test]
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fn test_wrap_count_matches_chars_zero_width() {
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assert_eq!(
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wrap_line_count("hello", 0),
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wrap_line_chars("hello", 0).len()
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);
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}
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#[test]
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fn test_wrap_count_matches_chars_ascii_short() {
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for width in 1..20 {
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assert_eq!(
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wrap_line_count("hello world", width),
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wrap_line_chars("hello world", width).len(),
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"width={width}"
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);
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}
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}
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#[test]
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fn test_wrap_count_matches_chars_cjk() {
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for width in 1..10 {
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assert_eq!(
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wrap_line_count("你好世界", width),
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wrap_line_chars("你好世界", width).len(),
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"width={width}"
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);
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}
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}
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#[test]
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fn test_wrap_count_matches_chars_emoji() {
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for width in 1..6 {
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assert_eq!(
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wrap_line_count("😀👨👩👧", width),
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wrap_line_chars("😀👨👩👧", width).len(),
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"width={width}"
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);
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}
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}
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#[test]
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fn test_wrap_count_matches_chars_combining_mark() {
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for width in 1..6 {
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assert_eq!(
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wrap_line_count("a\u{0301}b\u{0301}c", width),
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wrap_line_chars("a\u{0301}b\u{0301}c", width).len(),
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"width={width}"
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);
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}
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}
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#[test]
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fn test_wrap_count_matches_chars_tab_variants() {
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let inputs = ["\t", "a\tb", "ab\t", "\t\t", "abc\tb", "a\t\t\tb"];
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for input in inputs {
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for width in 1..9 {
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assert_eq!(
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wrap_line_count(input, width),
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wrap_line_chars(input, width).len(),
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"input={input:?} width={width}"
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);
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}
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}
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}
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#[test]
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fn test_wrap_count_matches_chars_mixed() {
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let input = "log: 你好 😀\tvalue=true [ERROR]";
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for width in 1..40 {
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assert_eq!(
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wrap_line_count(input, width),
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wrap_line_chars(input, width).len(),
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"width={width}"
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);
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}
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}
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#[test]
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fn test_wrap_count_matches_chars_zero_width_chars() {
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let input = "a\u{200B}b\u{200C}c\u{200D}d";
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for width in 1..8 {
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assert_eq!(
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wrap_line_count(input, width),
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wrap_line_chars(input, width).len(),
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"width={width}"
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);
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}
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}
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#[test]
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fn test_wrap_count_matches_chars_control_chars() {
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let input = "a\x07b\x1Fc";
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for width in 1..8 {
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assert_eq!(
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wrap_line_count(input, width),
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wrap_line_chars(input, width).len(),
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"width={width}"
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);
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}
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}
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#[test]
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fn test_wrap_count_matches_chars_long_log_line() {
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let input = "2025-01-14T10:23:45.123Z [INFO] [auth] request handled status=200 \
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latency=0.234s endpoint=/api/v1/users user=user_42 request_id=req_abc123def456";
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for width in [10, 20, 40, 60, 80, 100, 120] {
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assert_eq!(
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wrap_line_count(input, width),
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wrap_line_chars(input, width).len(),
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"width={width}"
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);
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}
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}
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}
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