8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/windows/classes/sun/nio/fs/WindowsPathParser.java

@@ -0,0 +1,229 @@
+/*
+ * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.nio.fs;
+
+import java.nio.file.InvalidPathException;
+
+/**
+ * A parser of Windows path strings
+ */
+
+class WindowsPathParser {
+    private WindowsPathParser() { }
+
+    /**
+     * The result of a parse operation
+     */
+    static class Result {
+        private final WindowsPathType type;
+        private final String root;
+        private final String path;
+
+        Result(WindowsPathType type, String root, String path) {
+            this.type = type;
+            this.root = root;
+            this.path = path;
+        }
+
+        /**
+         * The path type
+         */
+        WindowsPathType type() {
+            return type;
+        }
+
+        /**
+         * The root component
+         */
+        String root() {
+            return root;
+        }
+
+        /**
+         * The normalized path (includes root)
+         */
+        String path() {
+            return path;
+        }
+    }
+
+    /**
+     * Parses the given input as a Windows path
+     */
+    static Result parse(String input) {
+        return parse(input, true);
+    }
+
+    /**
+     * Parses the given input as a Windows path where it is known that the
+     * path is already normalized.
+     */
+    static Result parseNormalizedPath(String input) {
+        return parse(input, false);
+    }
+
+    /**
+     * Parses the given input as a Windows path.
+     *
+     * @param   requireToNormalize
+     *          Indicates if the path requires to be normalized
+     */
+    private static Result parse(String input, boolean requireToNormalize) {
+        String root = "";
+        WindowsPathType type = null;
+
+        int len = input.length();
+        int off = 0;
+        if (len > 1) {
+            char c0 = input.charAt(0);
+            char c1 = input.charAt(1);
+            char c = 0;
+            int next = 2;
+            if (isSlash(c0) && isSlash(c1)) {
+                // UNC: We keep the first two slash, collapse all the
+                // following, then take the hostname and share name out,
+                // meanwhile collapsing all the redundant slashes.
+                type = WindowsPathType.UNC;
+                off = nextNonSlash(input, next, len);
+                next = nextSlash(input, off, len);
+                if (off == next)
+                    throw new InvalidPathException(input, "UNC path is missing hostname");
+                String host = input.substring(off, next);  //host
+                off = nextNonSlash(input, next, len);
+                next = nextSlash(input, off, len);
+                if (off == next)
+                    throw new InvalidPathException(input, "UNC path is missing sharename");
+                root = "\\\\" + host + "\\" + input.substring(off, next) + "\\";
+                off = next;
+            } else {
+                if (isLetter(c0) && c1 == ':') {
+                    char c2;
+                    if (len > 2 && isSlash(c2 = input.charAt(2))) {
+                        // avoid concatenation when root is "D:\"
+                        if (c2 == '\\') {
+                            root = input.substring(0, 3);
+                        } else {
+                            root = input.substring(0, 2) + '\\';
+                        }
+                        off = 3;
+                        type = WindowsPathType.ABSOLUTE;
+                    } else {
+                        root = input.substring(0, 2);
+                        off = 2;
+                        type = WindowsPathType.DRIVE_RELATIVE;
+                    }
+                }
+            }
+        }
+        if (off == 0) {
+            if (len > 0 && isSlash(input.charAt(0))) {
+                type = WindowsPathType.DIRECTORY_RELATIVE;
+                root = "\\";
+            } else {
+                type = WindowsPathType.RELATIVE;
+            }
+        }
+
+        if (requireToNormalize) {
+            StringBuilder sb = new StringBuilder(input.length());
+            sb.append(root);
+            return new Result(type, root, normalize(sb, input, off));
+        } else {
+            return new Result(type, root, input);
+        }
+    }
+
+    /**
+     * Remove redundant slashes from the rest of the path, forcing all slashes
+     * into the preferred slash.
+    */
+    private static String normalize(StringBuilder sb, String path, int off) {
+        int len = path.length();
+        off = nextNonSlash(path, off, len);
+        int start = off;
+        char lastC = 0;
+        while (off < len) {
+            char c = path.charAt(off);
+            if (isSlash(c)) {
+                if (lastC == ' ')
+                    throw new InvalidPathException(path,
+                                                   "Trailing char <" + lastC + ">",
+                                                   off - 1);
+                sb.append(path, start, off);
+                off = nextNonSlash(path, off, len);
+                if (off != len)   //no slash at the end of normalized path
+                    sb.append('\\');
+                start = off;
+            } else {
+                if (isInvalidPathChar(c))
+                    throw new InvalidPathException(path,
+                                                   "Illegal char <" + c + ">",
+                                                   off);
+                lastC = c;
+                off++;
+            }
+        }
+        if (start != off) {
+            if (lastC == ' ')
+                throw new InvalidPathException(path,
+                                               "Trailing char <" + lastC + ">",
+                                               off - 1);
+            sb.append(path, start, off);
+        }
+        return sb.toString();
+    }
+
+    private static final boolean isSlash(char c) {
+        return (c == '\\') || (c == '/');
+    }
+
+    private static final int nextNonSlash(String path, int off, int end) {
+        while (off < end && isSlash(path.charAt(off))) { off++; }
+        return off;
+    }
+
+    private static final int nextSlash(String path, int off, int end) {
+        char c;
+        while (off < end && !isSlash(c=path.charAt(off))) {
+            if (isInvalidPathChar(c))
+                throw new InvalidPathException(path,
+                                               "Illegal character [" + c + "] in path",
+                                               off);
+            off++;
+        }
+        return off;
+    }
+
+    private static final boolean isLetter(char c) {
+        return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z'));
+    }
+
+    // Reserved characters for window path name
+    private static final String reservedChars = "<>:\"|?*";
+    private static final boolean isInvalidPathChar(char ch) {
+        return ch < '\u0020' || reservedChars.indexOf(ch) != -1;
+    }
+}