path: remove redundant function

PR-URL: #19237
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

Author: daynin

lib/path.js

@@ -50,7 +50,7 @@ function isWindowsDeviceRoot(code) {
 }
 
 // Resolves . and .. elements in a path with directory names
-function normalizeStringWin32(path, allowAboveRoot) {
+function normalizeString(path, allowAboveRoot, separator) {
   var res = '';
   var lastSegmentLength = 0;
   var lastSlash = -1;
@@ -72,14 +72,14 @@ function normalizeStringWin32(path, allowAboveRoot) {
             res.charCodeAt(res.length - 1) !== CHAR_DOT ||
             res.charCodeAt(res.length - 2) !== CHAR_DOT) {
           if (res.length > 2) {
-            const lastSlashIndex = res.lastIndexOf('\\');
+            const lastSlashIndex = res.lastIndexOf(separator);
             if (lastSlashIndex !== res.length - 1) {
               if (lastSlashIndex === -1) {
                 res = '';
                 lastSegmentLength = 0;
               } else {
                 res = res.slice(0, lastSlashIndex);
-                lastSegmentLength = res.length - 1 - res.lastIndexOf('\\');
+                lastSegmentLength = res.length - 1 - res.lastIndexOf(separator);
               }
               lastSlash = i;
               dots = 0;
@@ -95,82 +95,14 @@ function normalizeStringWin32(path, allowAboveRoot) {
         }
         if (allowAboveRoot) {
           if (res.length > 0)
-            res += '\\..';
+            res += `${separator}..`;
           else
             res = '..';
           lastSegmentLength = 2;
         }
       } else {
         if (res.length > 0)
-          res += '\\' + path.slice(lastSlash + 1, i);
-        else
-          res = path.slice(lastSlash + 1, i);
-        lastSegmentLength = i - lastSlash - 1;
-      }
-      lastSlash = i;
-      dots = 0;
-    } else if (code === CHAR_DOT && dots !== -1) {
-      ++dots;
-    } else {
-      dots = -1;
-    }
-  }
-  return res;
-}
-
-// Resolves . and .. elements in a path with directory names
-function normalizeStringPosix(path, allowAboveRoot) {
-  var res = '';
-  var lastSegmentLength = 0;
-  var lastSlash = -1;
-  var dots = 0;
-  var code;
-  for (var i = 0; i <= path.length; ++i) {
-    if (i < path.length)
-      code = path.charCodeAt(i);
-    else if (code === CHAR_FORWARD_SLASH)
-      break;
-    else
-      code = CHAR_FORWARD_SLASH;
-    if (code === CHAR_FORWARD_SLASH) {
-      if (lastSlash === i - 1 || dots === 1) {
-        // NOOP
-      } else if (lastSlash !== i - 1 && 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('/');
-            if (lastSlashIndex !== res.length - 1) {
-              if (lastSlashIndex === -1) {
-                res = '';
-                lastSegmentLength = 0;
-              } else {
-                res = res.slice(0, lastSlashIndex);
-                lastSegmentLength = res.length - 1 - res.lastIndexOf('/');
-              }
-              lastSlash = i;
-              dots = 0;
-              continue;
-            }
-          } else if (res.length === 2 || res.length === 1) {
-            res = '';
-            lastSegmentLength = 0;
-            lastSlash = i;
-            dots = 0;
-            continue;
-          }
-        }
-        if (allowAboveRoot) {
-          if (res.length > 0)
-            res += '/..';
-          else
-            res = '..';
-          lastSegmentLength = 2;
-        }
-      } else {
-        if (res.length > 0)
-          res += '/' + path.slice(lastSlash + 1, i);
+          res += separator + path.slice(lastSlash + 1, i);
         else
           res = path.slice(lastSlash + 1, i);
         lastSegmentLength = i - lastSlash - 1;
@@ -340,7 +272,7 @@ const win32 = {
     // fails)
 
     // Normalize the tail path
-    resolvedTail = normalizeStringWin32(resolvedTail, !resolvedAbsolute);
+    resolvedTail = normalizeString(resolvedTail, !resolvedAbsolute, '\\');
 
     return (resolvedDevice + (resolvedAbsolute ? '\\' : '') + resolvedTail) ||
            '.';
@@ -432,7 +364,7 @@ const win32 = {
 
     var tail;
     if (rootEnd < len)
-      tail = normalizeStringWin32(path.slice(rootEnd), !isAbsolute);
+      tail = normalizeString(path.slice(rootEnd), !isAbsolute, '\\');
     else
       tail = '';
     if (tail.length === 0 && !isAbsolute)
@@ -1164,7 +1096,7 @@ const posix = {
     // handle relative paths to be safe (might happen when process.cwd() fails)
 
     // Normalize the path
-    resolvedPath = normalizeStringPosix(resolvedPath, !resolvedAbsolute);
+    resolvedPath = normalizeString(resolvedPath, !resolvedAbsolute, '/');
 
     if (resolvedAbsolute) {
       if (resolvedPath.length > 0)
@@ -1190,7 +1122,7 @@ const posix = {
       path.charCodeAt(path.length - 1) === CHAR_FORWARD_SLASH;
 
     // Normalize the path
-    path = normalizeStringPosix(path, !isAbsolute);
+    path = normalizeString(path, !isAbsolute, '/');
 
     if (path.length === 0 && !isAbsolute)
       path = '.';