Remove deprecated scripts for adding head-matter to wt_config.xml, including Python and Bash implementations, to streamline configuration management.

node_modules/bare-path/lib/constants.js

@@ -0,0 +1,11 @@
+module.exports = {
+  CHAR_UPPERCASE_A: 0x41,
+  CHAR_LOWERCASE_A: 0x61,
+  CHAR_UPPERCASE_Z: 0x5a,
+  CHAR_LOWERCASE_Z: 0x7a,
+  CHAR_DOT: 0x2e,
+  CHAR_FORWARD_SLASH: 0x2f,
+  CHAR_BACKWARD_SLASH: 0x5c,
+  CHAR_COLON: 0x3a,
+  CHAR_QUESTION_MARK: 0x3f
+}

node_modules/bare-path/lib/posix.js

@@ -0,0 +1,242 @@
+const os = require('bare-os')
+
+const { normalizeString } = require('./shared')
+const {
+  CHAR_DOT,
+  CHAR_FORWARD_SLASH
+} = require('./constants')
+
+function isPosixPathSeparator (code) {
+  return code === CHAR_FORWARD_SLASH
+}
+
+exports.win32 = require('./win32')
+exports.posix = exports
+
+exports.sep = '/'
+exports.delimiter = ':'
+
+exports.resolve = function resolve (...args) {
+  let resolvedPath = ''
+  let resolvedAbsolute = false
+
+  for (let i = args.length - 1; i >= -1 && !resolvedAbsolute; i--) {
+    const path = i >= 0 ? args[i] : os.cwd()
+
+    if (path.length === 0) {
+      continue
+    }
+
+    resolvedPath = `${path}/${resolvedPath}`
+    resolvedAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH
+  }
+
+  resolvedPath = normalizeString(resolvedPath, !resolvedAbsolute, '/', isPosixPathSeparator)
+
+  if (resolvedAbsolute) {
+    return `/${resolvedPath}`
+  }
+
+  return resolvedPath.length > 0 ? resolvedPath : '.'
+}
+
+exports.normalize = function normalize (path) {
+  if (path.length === 0) return '.'
+
+  const isAbsolute = path.charCodeAt(0) === CHAR_FORWARD_SLASH
+  const trailingSeparator = path.charCodeAt(path.length - 1) === CHAR_FORWARD_SLASH
+
+  path = normalizeString(path, !isAbsolute, '/', isPosixPathSeparator)
+
+  if (path.length === 0) {
+    if (isAbsolute) return '/'
+    return trailingSeparator ? './' : '.'
+  }
+
+  if (trailingSeparator) path += '/'
+
+  return isAbsolute ? `/${path}` : path
+}
+
+exports.isAbsolute = function isAbsolute (path) {
+  return path.length > 0 && path.charCodeAt(0) === CHAR_FORWARD_SLASH
+}
+
+exports.join = function join (...args) {
+  if (args.length === 0) return '.'
+  let joined
+  for (let i = 0; i < args.length; ++i) {
+    const arg = args[i]
+    if (arg.length > 0) {
+      if (joined === undefined) joined = arg
+      else joined += `/${arg}`
+    }
+  }
+  if (joined === undefined) return '.'
+  return exports.normalize(joined)
+}
+
+exports.relative = function relative (from, to) {
+  if (from === to) return ''
+
+  from = exports.resolve(from)
+  to = exports.resolve(to)
+
+  if (from === to) return ''
+
+  const fromStart = 1
+  const fromEnd = from.length
+  const fromLen = fromEnd - fromStart
+  const toStart = 1
+  const toLen = to.length - toStart
+
+  const length = (fromLen < toLen ? fromLen : toLen)
+  let lastCommonSep = -1
+  let i = 0
+  for (; i < length; i++) {
+    const fromCode = from.charCodeAt(fromStart + i)
+    if (fromCode !== to.charCodeAt(toStart + i)) {
+      break
+    } else if (fromCode === CHAR_FORWARD_SLASH) {
+      lastCommonSep = i
+    }
+  }
+  if (i === length) {
+    if (toLen > length) {
+      if (to.charCodeAt(toStart + i) === CHAR_FORWARD_SLASH) {
+        return to.substring(toStart + i + 1)
+      }
+      if (i === 0) {
+        return to.substring(toStart + i)
+      }
+    } else if (fromLen > length) {
+      if (from.charCodeAt(fromStart + i) === CHAR_FORWARD_SLASH) {
+        lastCommonSep = i
+      } else if (i === 0) {
+        lastCommonSep = 0
+      }
+    }
+  }
+
+  let out = ''
+  for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
+    if (i === fromEnd || from.charCodeAt(i) === CHAR_FORWARD_SLASH) {
+      out += out.length === 0 ? '..' : '/..'
+    }
+  }
+
+  return `${out}${to.substring(toStart + lastCommonSep)}`
+}
+
+exports.toNamespacedPath = function toNamespacedPath (path) {
+  return path
+}
+
+exports.dirname = function dirname (path) {
+  if (path.length === 0) return '.'
+  const hasRoot = path.charCodeAt(0) === CHAR_FORWARD_SLASH
+  let end = -1
+  let matchedSlash = true
+  for (let i = path.length - 1; i >= 1; --i) {
+    if (path.charCodeAt(i) === CHAR_FORWARD_SLASH) {
+      if (!matchedSlash) {
+        end = i
+        break
+      }
+    } else {
+      matchedSlash = false
+    }
+  }
+
+  if (end === -1) return hasRoot ? '/' : '.'
+  if (hasRoot && end === 1) return '//'
+  return path.substring(0, end)
+}
+
+exports.basename = function basename (path, suffix) {
+  let start = 0
+  let end = -1
+  let matchedSlash = true
+
+  if (suffix !== undefined && suffix.length > 0 && suffix.length <= path.length) {
+    if (suffix === path) { return '' }
+    let extIdx = suffix.length - 1
+    let firstNonSlashEnd = -1
+    for (let i = path.length - 1; i >= 0; --i) {
+      const code = path.charCodeAt(i)
+      if (code === CHAR_FORWARD_SLASH) {
+        if (!matchedSlash) {
+          start = i + 1
+          break
+        }
+      } else {
+        if (firstNonSlashEnd === -1) {
+          matchedSlash = false
+          firstNonSlashEnd = i + 1
+        }
+        if (extIdx >= 0) {
+          if (code === suffix.charCodeAt(extIdx)) {
+            if (--extIdx === -1) {
+              end = i
+            }
+          } else {
+            extIdx = -1
+            end = firstNonSlashEnd
+          }
+        }
+      }
+    }
+
+    if (start === end) end = firstNonSlashEnd
+    else if (end === -1) end = path.length
+    return path.substring(start, end)
+  }
+
+  for (let i = path.length - 1; i >= 0; --i) {
+    if (path.charCodeAt(i) === CHAR_FORWARD_SLASH) {
+      if (!matchedSlash) {
+        start = i + 1
+        break
+      }
+    } else if (end === -1) {
+      matchedSlash = false
+      end = i + 1
+    }
+  }
+
+  if (end === -1) return ''
+  return path.substring(start, end)
+}
+
+exports.extname = function extname (path) {
+  let startDot = -1
+  let startPart = 0
+  let end = -1
+  let matchedSlash = true
+  let preDotState = 0
+  for (let i = path.length - 1; i >= 0; --i) {
+    const code = path.charCodeAt(i)
+    if (code === CHAR_FORWARD_SLASH) {
+      if (!matchedSlash) {
+        startPart = i + 1
+        break
+      }
+      continue
+    }
+    if (end === -1) {
+      matchedSlash = false
+      end = i + 1
+    }
+    if (code === CHAR_DOT) {
+      if (startDot === -1) startDot = i
+      else if (preDotState !== 1) preDotState = 1
+    } else if (startDot !== -1) {
+      preDotState = -1
+    }
+  }
+
+  if (startDot === -1 || end === -1 || preDotState === 0 || (preDotState === 1 && startDot === end - 1 && startDot === startPart + 1)) {
+    return ''
+  }
+  return path.substring(startDot, end)
+}

node_modules/bare-path/lib/shared.js

@@ -0,0 +1,67 @@
+const {
+  CHAR_DOT,
+  CHAR_FORWARD_SLASH
+} = require('./constants')
+
+exports.normalizeString = function normalizeString (path, allowAboveRoot, separator, isPathSeparator) {
+  let res = ''
+  let lastSegmentLength = 0
+  let lastSlash = -1
+  let dots = 0
+  let code = 0
+  for (let i = 0; i <= path.length; ++i) {
+    if (i < path.length) {
+      code = path.charCodeAt(i)
+    } else if (isPathSeparator(code)) {
+      break
+    } else {
+      code = CHAR_FORWARD_SLASH
+    }
+
+    if (isPathSeparator(code)) {
+      if (lastSlash === i - 1 || dots === 1) ;
+      else if (dots === 2) {
+        if (res.length < 2 || lastSegmentLength !== 2 || res.charCodeAt(res.length - 1) !== CHAR_DOT || res.charCodeAt(res.length - 2) !== CHAR_DOT) {
+          if (res.length > 2) {
+            const lastSlashIndex = res.lastIndexOf(separator)
+            if (lastSlashIndex === -1) {
+              res = ''
+              lastSegmentLength = 0
+            } else {
+              res = res.substring(0, lastSlashIndex)
+              lastSegmentLength =
+                res.length - 1 - res.lastIndexOf(separator)
+            }
+            lastSlash = i
+            dots = 0
+            continue
+          } else if (res.length !== 0) {
+            res = ''
+            lastSegmentLength = 0
+            lastSlash = i
+            dots = 0
+            continue
+          }
+        }
+        if (allowAboveRoot) {
+          res += res.length > 0 ? `${separator}..` : '..'
+          lastSegmentLength = 2
+        }
+      } else {
+        if (res.length > 0) {
+          res += `${separator}${path.substring(lastSlash + 1, i)}`
+        } else {
+          res = path.substring(lastSlash + 1, i)
+        }
+        lastSegmentLength = i - lastSlash - 1
+      }
+      lastSlash = i
+      dots = 0
+    } else if (code === CHAR_DOT && dots !== -1) {
+      ++dots
+    } else {
+      dots = -1
+    }
+  }
+  return res
+}

node_modules/bare-path/lib/win32.js

@@ -0,0 +1,513 @@
+const os = require('bare-os')
+
+const { normalizeString } = require('./shared')
+const {
+  CHAR_UPPERCASE_A,
+  CHAR_LOWERCASE_A,
+  CHAR_UPPERCASE_Z,
+  CHAR_LOWERCASE_Z,
+  CHAR_DOT,
+  CHAR_FORWARD_SLASH,
+  CHAR_BACKWARD_SLASH,
+  CHAR_COLON,
+  CHAR_QUESTION_MARK
+} = require('./constants')
+
+function isWindowsPathSeparator (code) {
+  return code === CHAR_FORWARD_SLASH || code === CHAR_BACKWARD_SLASH
+}
+
+function isWindowsDeviceRoot (code) {
+  return (code >= CHAR_UPPERCASE_A && code <= CHAR_UPPERCASE_Z) ||
+         (code >= CHAR_LOWERCASE_A && code <= CHAR_LOWERCASE_Z)
+}
+
+exports.posix = require('./posix')
+exports.win32 = exports
+
+exports.sep = '\\'
+exports.delimiter = ';'
+
+exports.resolve = function resolve (...args) {
+  let resolvedDevice = ''
+  let resolvedTail = ''
+  let resolvedAbsolute = false
+
+  for (let i = args.length - 1; i >= -1; i--) {
+    let path
+    if (i >= 0) {
+      path = args[i]
+
+      if (path.length === 0) continue
+    } else if (resolvedDevice.length === 0) {
+      path = os.cwd()
+    } else {
+      path = os.getEnv(`=${resolvedDevice}`) || os.cwd()
+
+      if (path === undefined || (path.substring(0, 2).toLowerCase() !== resolvedDevice.toLowerCase() && path.charCodeAt(2) === CHAR_BACKWARD_SLASH)) {
+        path = `${resolvedDevice}\\`
+      }
+    }
+
+    const len = path.length
+    let rootEnd = 0
+    let device = ''
+    let isAbsolute = false
+    const code = path.charCodeAt(0)
+
+    if (len === 1) {
+      if (isWindowsPathSeparator(code)) {
+        rootEnd = 1
+        isAbsolute = true
+      }
+    } else if (isWindowsPathSeparator(code)) {
+      isAbsolute = true
+
+      if (isWindowsPathSeparator(path.charCodeAt(1))) {
+        let j = 2
+        let last = j
+        while (j < len && !isWindowsPathSeparator(path.charCodeAt(j))) {
+          j++
+        }
+        if (j < len && j !== last) {
+          const firstPart = path.substring(last, j)
+          last = j
+          while (j < len && isWindowsPathSeparator(path.charCodeAt(j))) {
+            j++
+          }
+          if (j < len && j !== last) {
+            last = j
+            while (j < len && !isWindowsPathSeparator(path.charCodeAt(j))) {
+              j++
+            }
+            if (j === len || j !== last) {
+              device = `\\\\${firstPart}\\${path.substring(last, j)}`
+              rootEnd = j
+            }
+          }
+        }
+      } else {
+        rootEnd = 1
+      }
+    } else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
+      device = path.substring(0, 2)
+      rootEnd = 2
+      if (len > 2 && isWindowsPathSeparator(path.charCodeAt(2))) {
+        isAbsolute = true
+        rootEnd = 3
+      }
+    }
+
+    if (device.length > 0) {
+      if (resolvedDevice.length > 0) {
+        if (device.toLowerCase() !== resolvedDevice.toLowerCase()) { continue }
+      } else {
+        resolvedDevice = device
+      }
+    }
+
+    if (resolvedAbsolute) {
+      if (resolvedDevice.length > 0) { break }
+    } else {
+      resolvedTail = `${path.substring(rootEnd)}\\${resolvedTail}`
+      resolvedAbsolute = isAbsolute
+      if (isAbsolute && resolvedDevice.length > 0) {
+        break
+      }
+    }
+  }
+
+  resolvedTail = normalizeString(resolvedTail, !resolvedAbsolute, '\\', isWindowsPathSeparator)
+
+  return resolvedAbsolute ? `${resolvedDevice}\\${resolvedTail}` : `${resolvedDevice}${resolvedTail}` || '.'
+}
+
+exports.normalize = function normalize (path) {
+  const len = path.length
+  if (len === 0) return '.'
+  let rootEnd = 0
+  let device
+  let isAbsolute = false
+  const code = path.charCodeAt(0)
+
+  if (len === 1) {
+    return code === CHAR_FORWARD_SLASH ? '\\' : path
+  }
+
+  if (isWindowsPathSeparator(code)) {
+    isAbsolute = true
+
+    if (isWindowsPathSeparator(path.charCodeAt(1))) {
+      let j = 2
+      let last = j
+      while (j < len && !isWindowsPathSeparator(path.charCodeAt(j))) {
+        j++
+      }
+      if (j < len && j !== last) {
+        const firstPart = path.substring(last, j)
+        last = j
+        while (j < len && isWindowsPathSeparator(path.charCodeAt(j))) {
+          j++
+        }
+        if (j < len && j !== last) {
+          last = j
+          while (j < len && !isWindowsPathSeparator(path.charCodeAt(j))) {
+            j++
+          }
+          if (j === len) {
+            return `\\\\${firstPart}\\${path.substring(last)}\\`
+          }
+          if (j !== last) {
+            device = `\\\\${firstPart}\\${path.substring(last, j)}`
+            rootEnd = j
+          }
+        }
+      }
+    } else {
+      rootEnd = 1
+    }
+  } else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
+    device = path.substring(0, 2)
+    rootEnd = 2
+    if (len > 2 && isWindowsPathSeparator(path.charCodeAt(2))) {
+      isAbsolute = true
+      rootEnd = 3
+    }
+  }
+
+  let tail = rootEnd < len ? normalizeString(path.substring(rootEnd), !isAbsolute, '\\', isWindowsPathSeparator) : ''
+  if (tail.length === 0 && !isAbsolute) {
+    tail = '.'
+  }
+  if (tail.length > 0 && isWindowsPathSeparator(path.charCodeAt(len - 1))) {
+    tail += '\\'
+  }
+  if (device === undefined) {
+    return isAbsolute ? `\\${tail}` : tail
+  }
+  return isAbsolute ? `${device}\\${tail}` : `${device}${tail}`
+}
+
+exports.isAbsolute = function isAbsolute (path) {
+  const len = path.length
+  if (len === 0) return false
+
+  const code = path.charCodeAt(0)
+
+  return isWindowsPathSeparator(code) || (len > 2 && isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON && isWindowsPathSeparator(path.charCodeAt(2)))
+}
+
+exports.join = function join (...args) {
+  if (args.length === 0) return '.'
+
+  let joined
+  let firstPart
+  for (let i = 0; i < args.length; ++i) {
+    const arg = args[i]
+    if (arg.length > 0) {
+      if (joined === undefined) joined = firstPart = arg
+      else joined += `\\${arg}`
+    }
+  }
+
+  if (joined === undefined) return '.'
+
+  let needsReplace = true
+  let slashCount = 0
+  if (isWindowsPathSeparator(firstPart.charCodeAt(0))) {
+    ++slashCount
+    const firstLen = firstPart.length
+    if (firstLen > 1 && isWindowsPathSeparator(firstPart.charCodeAt(1))) {
+      ++slashCount
+      if (firstLen > 2) {
+        if (isWindowsPathSeparator(firstPart.charCodeAt(2))) {
+          ++slashCount
+        } else {
+          needsReplace = false
+        }
+      }
+    }
+  }
+  if (needsReplace) {
+    while (slashCount < joined.length && isWindowsPathSeparator(joined.charCodeAt(slashCount))) {
+      slashCount++
+    }
+
+    if (slashCount >= 2) {
+      joined = `\\${joined.substring(slashCount)}`
+    }
+  }
+
+  return exports.normalize(joined)
+}
+
+exports.relative = function relative (from, to) {
+  if (from === to) return ''
+
+  const fromOrig = exports.resolve(from)
+  const toOrig = exports.resolve(to)
+
+  if (fromOrig === toOrig) return ''
+
+  from = fromOrig.toLowerCase()
+  to = toOrig.toLowerCase()
+
+  if (from === to) return ''
+
+  let fromStart = 0
+  while (fromStart < from.length && from.charCodeAt(fromStart) === CHAR_BACKWARD_SLASH) {
+    fromStart++
+  }
+  let fromEnd = from.length
+  while (fromEnd - 1 > fromStart && from.charCodeAt(fromEnd - 1) === CHAR_BACKWARD_SLASH) {
+    fromEnd--
+  }
+  const fromLen = fromEnd - fromStart
+
+  let toStart = 0
+  while (toStart < to.length && to.charCodeAt(toStart) === CHAR_BACKWARD_SLASH) {
+    toStart++
+  }
+  let toEnd = to.length
+  while (toEnd - 1 > toStart && to.charCodeAt(toEnd - 1) === CHAR_BACKWARD_SLASH) {
+    toEnd--
+  }
+  const toLen = toEnd - toStart
+
+  const length = fromLen < toLen ? fromLen : toLen
+  let lastCommonSep = -1
+  let i = 0
+  for (; i < length; i++) {
+    const fromCode = from.charCodeAt(fromStart + i)
+    if (fromCode !== to.charCodeAt(toStart + i)) {
+      break
+    } else if (fromCode === CHAR_BACKWARD_SLASH) {
+      lastCommonSep = i
+    }
+  }
+
+  if (i !== length) {
+    if (lastCommonSep === -1) return toOrig
+  } else {
+    if (toLen > length) {
+      if (to.charCodeAt(toStart + i) === CHAR_BACKWARD_SLASH) {
+        return toOrig.substring(toStart + i + 1)
+      }
+      if (i === 2) {
+        return toOrig.substring(toStart + i)
+      }
+    }
+    if (fromLen > length) {
+      if (from.charCodeAt(fromStart + i) === CHAR_BACKWARD_SLASH) {
+        lastCommonSep = i
+      } else if (i === 2) {
+        lastCommonSep = 3
+      }
+    }
+    if (lastCommonSep === -1) lastCommonSep = 0
+  }
+
+  let out = ''
+  for (i = fromStart + lastCommonSep + 1; i <= fromEnd; ++i) {
+    if (i === fromEnd || from.charCodeAt(i) === CHAR_BACKWARD_SLASH) {
+      out += out.length === 0 ? '..' : '\\..'
+    }
+  }
+
+  toStart += lastCommonSep
+
+  if (out.length > 0) {
+    return `${out}${toOrig.substring(toStart, toEnd)}`
+  }
+  if (toOrig.charCodeAt(toStart) === CHAR_BACKWARD_SLASH) {
+    ++toStart
+  }
+  return toOrig.substring(toStart, toEnd)
+}
+
+exports.toNamespacedPath = function toNamespacedPath (path) {
+  if (path.length === 0) return path
+
+  const resolvedPath = exports.resolve(path)
+
+  if (resolvedPath.length <= 2) return path
+
+  if (resolvedPath.charCodeAt(0) === CHAR_BACKWARD_SLASH) {
+    if (resolvedPath.charCodeAt(1) === CHAR_BACKWARD_SLASH) {
+      const code = resolvedPath.charCodeAt(2)
+      if (code !== CHAR_QUESTION_MARK && code !== CHAR_DOT) {
+        return `\\\\?\\UNC\\${resolvedPath.substring(2)}`
+      }
+    }
+  } else if (
+    isWindowsDeviceRoot(resolvedPath.charCodeAt(0)) &&
+      resolvedPath.charCodeAt(1) === CHAR_COLON &&
+      resolvedPath.charCodeAt(2) === CHAR_BACKWARD_SLASH
+  ) {
+    return `\\\\?\\${resolvedPath}`
+  }
+
+  return path
+}
+
+exports.dirname = function dirname (path) {
+  const len = path.length
+  if (len === 0) return '.'
+  let rootEnd = -1
+  let offset = 0
+  const code = path.charCodeAt(0)
+
+  if (len === 1) {
+    return isWindowsPathSeparator(code) ? path : '.'
+  }
+
+  if (isWindowsPathSeparator(code)) {
+    rootEnd = offset = 1
+
+    if (isWindowsPathSeparator(path.charCodeAt(1))) {
+      let j = 2
+      let last = j
+      while (j < len && !isWindowsPathSeparator(path.charCodeAt(j))) {
+        j++
+      }
+      if (j < len && j !== last) {
+        last = j
+        while (j < len && isWindowsPathSeparator(path.charCodeAt(j))) {
+          j++
+        }
+        if (j < len && j !== last) {
+          last = j
+          while (j < len && !isWindowsPathSeparator(path.charCodeAt(j))) {
+            j++
+          }
+          if (j === len) {
+            return path
+          }
+          if (j !== last) {
+            rootEnd = offset = j + 1
+          }
+        }
+      }
+    }
+  } else if (isWindowsDeviceRoot(code) && path.charCodeAt(1) === CHAR_COLON) {
+    rootEnd = len > 2 && isWindowsPathSeparator(path.charCodeAt(2)) ? 3 : 2
+    offset = rootEnd
+  }
+
+  let end = -1
+  let matchedSlash = true
+  for (let i = len - 1; i >= offset; --i) {
+    if (isWindowsPathSeparator(path.charCodeAt(i))) {
+      if (!matchedSlash) {
+        end = i
+        break
+      }
+    } else {
+      matchedSlash = false
+    }
+  }
+
+  if (end === -1) {
+    if (rootEnd === -1) return '.'
+
+    end = rootEnd
+  }
+  return path.substring(0, end)
+}
+
+exports.basename = function basename (path, suffix) {
+  let start = 0
+  let end = -1
+  let matchedSlash = true
+
+  if (path.length >= 2 && isWindowsDeviceRoot(path.charCodeAt(0)) && path.charCodeAt(1) === CHAR_COLON) {
+    start = 2
+  }
+
+  if (suffix !== undefined && suffix.length > 0 && suffix.length <= path.length) {
+    if (suffix === path) return ''
+    let extIdx = suffix.length - 1
+    let firstNonSlashEnd = -1
+    for (let i = path.length - 1; i >= start; --i) {
+      const code = path.charCodeAt(i)
+      if (isWindowsPathSeparator(code)) {
+        if (!matchedSlash) {
+          start = i + 1
+          break
+        }
+      } else {
+        if (firstNonSlashEnd === -1) {
+          matchedSlash = false
+          firstNonSlashEnd = i + 1
+        }
+        if (extIdx >= 0) {
+          if (code === suffix.charCodeAt(extIdx)) {
+            if (--extIdx === -1) {
+              end = i
+            }
+          } else {
+            extIdx = -1
+            end = firstNonSlashEnd
+          }
+        }
+      }
+    }
+
+    if (start === end) end = firstNonSlashEnd
+    else if (end === -1) end = path.length
+    return path.substring(start, end)
+  }
+  for (let i = path.length - 1; i >= start; --i) {
+    if (isWindowsPathSeparator(path.charCodeAt(i))) {
+      if (!matchedSlash) {
+        start = i + 1
+        break
+      }
+    } else if (end === -1) {
+      matchedSlash = false
+      end = i + 1
+    }
+  }
+
+  if (end === -1) return ''
+  return path.substring(start, end)
+}
+
+exports.extname = function extname (path) {
+  let start = 0
+  let startDot = -1
+  let startPart = 0
+  let end = -1
+  let matchedSlash = true
+  let preDotState = 0
+
+  if (path.length >= 2 && path.charCodeAt(1) === CHAR_COLON && isWindowsDeviceRoot(path.charCodeAt(0))) {
+    start = startPart = 2
+  }
+
+  for (let i = path.length - 1; i >= start; --i) {
+    const code = path.charCodeAt(i)
+    if (isWindowsPathSeparator(code)) {
+      if (!matchedSlash) {
+        startPart = i + 1
+        break
+      }
+      continue
+    }
+    if (end === -1) {
+      matchedSlash = false
+      end = i + 1
+    }
+    if (code === CHAR_DOT) {
+      if (startDot === -1) startDot = i
+      else if (preDotState !== 1) preDotState = 1
+    } else if (startDot !== -1) {
+      preDotState = -1
+    }
+  }
+
+  if (startDot === -1 || end === -1 || preDotState === 0 || (preDotState === 1 && startDot === end - 1 && startDot === startPart + 1)) {
+    return ''
+  }
+  return path.substring(startDot, end)
+}