From 45b30cd5af5d0c069c6ad7d323d35bfa4fcd907b Mon Sep 17 00:00:00 2001
From: Yang Jun <harttleharttle@gmail.com>
Date: Sun, 10 May 2026 14:21:17 +0800
Subject: [PATCH] fix(strftime): use add() once for padding, minimize churn

- pad(): replace per-char loop with a single add(str, ch.repeat(n)) call.
  The earlier `probe[0] === ch` heuristic was wrong when ch happened to
  equal a leading char of 'probe' (e.g. ch === 'p').
- strftime.ts: revert unrelated typing/structural refactors so the diff
  contains only the memoryLimit threading and the %N memory charge.
- docs: rewire the deleted dos.html sidebar entry to security-model.html
  (with localized labels) so the deleted page does not 404 from the
  sidebar.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 docs/source/_data/sidebar.yml        |  2 +-
 docs/themes/navy/languages/en.yml    |  2 +-
 docs/themes/navy/languages/zh-cn.yml |  2 +-
 src/util/strftime.ts                 | 18 ++++++++----------
 src/util/underscore.ts               |  4 +---
 5 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/docs/source/_data/sidebar.yml b/docs/source/_data/sidebar.yml
index 7f54e8baa..6edcc6b29 100644
--- a/docs/source/_data/sidebar.yml
+++ b/docs/source/_data/sidebar.yml
@@ -19,7 +19,7 @@ tutorials:
     plugins: plugins.html
     operators: operators.html
     truth: truthy-and-falsy.html
-    dos: dos.html
+    security_model: security-model.html
     static_analysis: static-analysis.html
   miscellaneous:
     migration9: migrate-to-9.html
diff --git a/docs/themes/navy/languages/en.yml b/docs/themes/navy/languages/en.yml
index 51cb9052e..e75e09d00 100644
--- a/docs/themes/navy/languages/en.yml
+++ b/docs/themes/navy/languages/en.yml
@@ -51,7 +51,7 @@ sidebar:
     plugins: Plugins
     operators: Operators
     truth: Truthy and Falsy
-    dos: DoS
+    security_model: Security Model
     static_analysis: Static Analysis
 
     miscellaneous: Miscellaneous
diff --git a/docs/themes/navy/languages/zh-cn.yml b/docs/themes/navy/languages/zh-cn.yml
index cd2889a61..e5ea5d3b2 100644
--- a/docs/themes/navy/languages/zh-cn.yml
+++ b/docs/themes/navy/languages/zh-cn.yml
@@ -51,7 +51,7 @@ sidebar:
     plugins: 插件
     operators: 运算符
     truth: 真和假
-    dos: DoS
+    security_model: 安全模型
     static_analysis: 静态分析
 
     miscellaneous: 其他
diff --git a/src/util/strftime.ts b/src/util/strftime.ts
index 971de58b8..e6ac04ebf 100644
--- a/src/util/strftime.ts
+++ b/src/util/strftime.ts
@@ -4,7 +4,7 @@ import type { Limiter } from './limiter'
 
 const rFormat = /%([-_0^#:]+)?(\d+)?([EO])?(.)/
 interface FormatOptions {
-  flags: Record<string, boolean>;
+  flags: object;
   width?: string;
   modifier?: string;
   memoryLimit?: Pick<Limiter, 'use'>;
@@ -77,7 +77,7 @@ function getTimezoneOffset (d: LiquidDate, opts: FormatOptions) {
     (opts.flags[':'] ? ':' : '') +
     padStart(m, 2, '0')
 }
-const formatCodes: Record<string, (d: LiquidDate, opts: FormatOptions) => unknown> = {
+const formatCodes = {
   a: (d: LiquidDate) => d.getShortWeekdayName(),
   A: (d: LiquidDate) => d.getLongWeekdayName(),
   b: (d: LiquidDate) => d.getShortMonthName(),
@@ -118,13 +118,13 @@ const formatCodes: Record<string, (d: LiquidDate, opts: FormatOptions) => unknow
   't': () => '\t',
   'n': () => '\n',
   '%': () => '%'
-}
-formatCodes.h = formatCodes.b
+};
+(formatCodes as any).h = formatCodes.b
 
 export function strftime (d: LiquidDate, formatStr: string, memoryLimit?: Pick<Limiter, 'use'>) {
   let output = ''
   let remaining = formatStr
-  let match: RegExpExecArray | null
+  let match
   while ((match = rFormat.exec(remaining))) {
     output += remaining.slice(0, match.index)
     remaining = remaining.slice(match.index + match[0].length)
@@ -137,18 +137,16 @@ function format (d: LiquidDate, match: RegExpExecArray, memoryLimit?: Pick<Limit
   const [input, flagStr = '', width, modifier, conversion] = match
   const convert = formatCodes[conversion]
   if (!convert) return input
-  const flags: Record<string, boolean> = {}
+  const flags = {}
   for (const flag of flagStr) flags[flag] = true
   let ret = String(convert(d, { flags, width, modifier, memoryLimit }))
   let padChar = padSpaceChars.has(conversion) ? ' ' : '0'
-  let padWidth = width ? Number(width) : (padWidths[conversion as keyof typeof padWidths] || 0)
-  if (!Number.isFinite(padWidth) || padWidth < 0) padWidth = 0
+  let padWidth = width || padWidths[conversion] || 0
   if (flags['^']) ret = ret.toUpperCase()
   else if (flags['#']) ret = changeCase(ret)
   if (flags['_']) padChar = ' '
   else if (flags['0']) padChar = '0'
   if (flags['-']) padWidth = 0
-
-  memoryLimit?.use(Math.max(0, padWidth - ret.length))
+  memoryLimit?.use(Number(padWidth) - ret.length)
   return padStart(ret, padWidth, padChar)
 }
diff --git a/src/util/underscore.ts b/src/util/underscore.ts
index 3f4eba180..665fdef6c 100644
--- a/src/util/underscore.ts
+++ b/src/util/underscore.ts
@@ -154,9 +154,7 @@ export function pad (str: any, length: number, ch: string, add: (str: string, ch
   str = String(str)
   const n = length - str.length
   if (n <= 0) return str
-  const padChunk = ch.repeat(n)
-  const probe = add('probe', ch)
-  return probe[0] === ch ? padChunk + str : str + padChunk
+  return add(str, ch.repeat(n))
 }
 
 export function identify<T> (val: T): T {