Merge pull request github#14321 from aschackmull/shared/filesystem

All languages: Use shared FileSystem library and minor regex performance improvement.

Author: aschackmull

cpp/ql/lib/semmle/code/cpp/File.qll

@@ -5,155 +5,35 @@
 import semmle.code.cpp.Element
 import semmle.code.cpp.Declaration
 import semmle.code.cpp.metrics.MetricFile
+private import codeql.util.FileSystem
 
-/** A file or folder. */
-class Container extends Locatable, @container {
-  /**
-   * Gets the absolute, canonical path of this container, using forward slashes
-   * as path separator.
-   *
-   * The path starts with a _root prefix_ followed by zero or more _path
-   * segments_ separated by forward slashes.
-   *
-   * The root prefix is of one of the following forms:
-   *
-   *   1. A single forward slash `/` (Unix-style)
-   *   2. An upper-case drive letter followed by a colon and a forward slash,
-   *      such as `C:/` (Windows-style)
-   *   3. Two forward slashes, a computer name, and then another forward slash,
-   *      such as `//FileServer/` (UNC-style)
-   *
-   * Path segments are never empty (that is, absolute paths never contain two
-   * contiguous slashes, except as part of a UNC-style root prefix). Also, path
-   * segments never contain forward slashes, and no path segment is of the
-   * form `.` (one dot) or `..` (two dots).
-   *
-   * Note that an absolute path never ends with a forward slash, except if it is
-   * a bare root prefix, that is, the path has no path segments. A container
-   * whose absolute path has no segments is always a `Folder`, not a `File`.
-   */
-  string getAbsolutePath() { none() } // overridden by subclasses
+private module Input implements InputSig {
+  abstract class ContainerBase extends @container {
+    abstract string getAbsolutePath();
 
-  /**
-   * Gets the relative path of this file or folder from the root folder of the
-   * analyzed source location. The relative path of the root folder itself is
-   * the empty string.
-   *
-   * This has no result if the container is outside the source root, that is,
-   * if the root folder is not a reflexive, transitive parent of this container.
-   */
-  string getRelativePath() {
-    exists(string absPath, string pref |
-      absPath = this.getAbsolutePath() and sourceLocationPrefix(pref)
-    |
-      absPath = pref and result = ""
-      or
-      absPath = pref.regexpReplaceAll("/$", "") + "/" + result and
-      not result.matches("/%")
-    )
-  }
+    ContainerBase getParentContainer() {
+      containerparent(unresolveElement(result), underlyingElement(this))
+    }
 
-  /**
-   * Gets the base name of this container including extension, that is, the last
-   * segment of its absolute path, or the empty string if it has no segments.
-   *
-   * Here are some examples of absolute paths and the corresponding base names
-   * (surrounded with quotes to avoid ambiguity):
-   *
-   * <table border="1">
-   * <tr><th>Absolute path</th><th>Base name</th></tr>
-   * <tr><td>"/tmp/tst.js"</td><td>"tst.js"</td></tr>
-   * <tr><td>"C:/Program Files (x86)"</td><td>"Program Files (x86)"</td></tr>
-   * <tr><td>"/"</td><td>""</td></tr>
-   * <tr><td>"C:/"</td><td>""</td></tr>
-   * <tr><td>"D:/"</td><td>""</td></tr>
-   * <tr><td>"//FileServer/"</td><td>""</td></tr>
-   * </table>
-   */
-  string getBaseName() {
-    result = this.getAbsolutePath().regexpCapture(".*/(([^/]*?)(?:\\.([^.]*))?)", 1)
+    string toString() { result = this.getAbsolutePath() }
   }
 
-  /**
-   * Gets the extension of this container, that is, the suffix of its base name
-   * after the last dot character, if any.
-   *
-   * In particular,
-   *
-   *  - if the name does not include a dot, there is no extension, so this
-   *    predicate has no result;
-   *  - if the name ends in a dot, the extension is the empty string;
-   *  - if the name contains multiple dots, the extension follows the last dot.
-   *
-   * Here are some examples of absolute paths and the corresponding extensions
-   * (surrounded with quotes to avoid ambiguity):
-   *
-   * <table border="1">
-   * <tr><th>Absolute path</th><th>Extension</th></tr>
-   * <tr><td>"/tmp/tst.js"</td><td>"js"</td></tr>
-   * <tr><td>"/tmp/.classpath"</td><td>"classpath"</td></tr>
-   * <tr><td>"/bin/bash"</td><td>not defined</td></tr>
-   * <tr><td>"/tmp/tst2."</td><td>""</td></tr>
-   * <tr><td>"/tmp/x.tar.gz"</td><td>"gz"</td></tr>
-   * </table>
-   */
-  string getExtension() {
-    result = this.getAbsolutePath().regexpCapture(".*/([^/]*?)(\\.([^.]*))?", 3)
-  }
-
-  /**
-   * Gets the stem of this container, that is, the prefix of its base name up to
-   * (but not including) the last dot character if there is one, or the entire
-   * base name if there is not.
-   *
-   * Here are some examples of absolute paths and the corresponding stems
-   * (surrounded with quotes to avoid ambiguity):
-   *
-   * <table border="1">
-   * <tr><th>Absolute path</th><th>Stem</th></tr>
-   * <tr><td>"/tmp/tst.js"</td><td>"tst"</td></tr>
-   * <tr><td>"/tmp/.classpath"</td><td>""</td></tr>
-   * <tr><td>"/bin/bash"</td><td>"bash"</td></tr>
-   * <tr><td>"/tmp/tst2."</td><td>"tst2"</td></tr>
-   * <tr><td>"/tmp/x.tar.gz"</td><td>"x.tar"</td></tr>
-   * </table>
-   */
-  string getStem() {
-    result = this.getAbsolutePath().regexpCapture(".*/([^/]*?)(?:\\.([^.]*))?", 1)
-  }
-
-  /** Gets the parent container of this file or folder, if any. */
-  Container getParentContainer() {
-    containerparent(unresolveElement(result), underlyingElement(this))
+  class FolderBase extends ContainerBase, @folder {
+    override string getAbsolutePath() { folders(underlyingElement(this), result) }
   }
 
-  /** Gets a file or sub-folder in this container. */
-  Container getAChildContainer() { this = result.getParentContainer() }
-
-  /** Gets a file in this container. */
-  File getAFile() { result = this.getAChildContainer() }
-
-  /** Gets the file in this container that has the given `baseName`, if any. */
-  File getFile(string baseName) {
-    result = this.getAFile() and
-    result.getBaseName() = baseName
+  class FileBase extends ContainerBase, @file {
+    override string getAbsolutePath() { files(underlyingElement(this), result) }
   }
 
-  /** Gets a sub-folder in this container. */
-  Folder getAFolder() { result = this.getAChildContainer() }
+  predicate hasSourceLocationPrefix = sourceLocationPrefix/1;
+}
 
-  /** Gets the sub-folder in this container that has the given `baseName`, if any. */
-  Folder getFolder(string baseName) {
-    result = this.getAFolder() and
-    result.getBaseName() = baseName
-  }
+private module Impl = Make<Input>;
 
-  /**
-   * Gets a textual representation of the path of this container.
-   *
-   * This is the absolute path of the container.
-   */
-  override string toString() { result = this.getAbsolutePath() }
+/** A file or folder. */
+class Container extends Locatable, Impl::Container {
+  override string toString() { result = Impl::Container.super.toString() }
 }
 
 /**
@@ -166,9 +46,7 @@ class Container extends Locatable, @container {
  *
  * To get the full path, use `getAbsolutePath`.
  */
-class Folder extends Container, @folder {
-  override string getAbsolutePath() { folders(underlyingElement(this), result) }
-
+class Folder extends Container, Impl::Folder {
   override Location getLocation() {
     result.getContainer() = this and
     result.hasLocationInfo(_, 0, 0, 0, 0)
@@ -189,9 +67,7 @@ class Folder extends Container, @folder {
  * The base name further decomposes into the _stem_ and _extension_ -- see
  * `getStem` and `getExtension`. To get the full path, use `getAbsolutePath`.
  */
-class File extends Container, @file {
-  override string getAbsolutePath() { files(underlyingElement(this), result) }
-
+class File extends Container, Impl::File {
   override string getAPrimaryQlClass() { result = "File" }
 
   override Location getLocation() {

csharp/ql/lib/semmle/code/csharp/File.qll

@@ -29,8 +29,7 @@ private module Impl = Make<Input>;
 
 class Container = Impl::Container;
 
-/** A folder. */
-class Folder extends Container, Impl::Folder { }
+class Folder = Impl::Folder;
 
 bindingset[flag]
 private predicate fileHasExtractionFlag(File f, int flag) {