1 files changed, 106 insertions, 0 deletions
diff --git a/plugins/svn4idea/src/org/jetbrains/idea/svn/properties/ExternalsDefinitionParser.java b/plugins/svn4idea/src/org/jetbrains/idea/svn/properties/ExternalsDefinitionParser.java
new file mode 100644
index 000000000000..b3ec74e397cb
--- /dev/null
+++ b/plugins/svn4idea/src/org/jetbrains/idea/svn/properties/ExternalsDefinitionParser.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jetbrains.idea.svn.properties;
+
+import com.intellij.openapi.util.text.StringUtil;
+import com.intellij.util.containers.ContainerUtil;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.idea.svn.commandLine.SvnBindException;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author Konstantin Kolosovsky.
+ */
+public class ExternalsDefinitionParser {
+
+  /**
+   * Parses "svn:externals" property in format starting from svn 1.5.
+   *
+   * @return map of externals definitions: key - relative directory, value - corresponding complete externals definition.
+   */
+  @NotNull
+  public static Map<String, String> parseExternalsProperty(@NotNull String externals) throws SvnBindException {
+    HashMap<String, String> map = ContainerUtil.newHashMap();
+
+    for (String external : StringUtil.splitByLines(externals, true)) {
+      map.put(parseRelativeDirectory(external), external);
+    }
+
+    return map;
+  }
+
+  /**
+   * Parses relative directory from externals definition (in format starting from svn 1.5). Restrictions for relative directory:
+   * - is at the end of externals definition separated from other parameters by ' ' char
+   * - could be quoted with '"' char
+   * - certain chars could be escaped with '\' char
+   */
+  @NotNull
+  public static String parseRelativeDirectory(@NotNull String s) throws SvnBindException {
+    s = s.trim();
+
+    int length = s.length();
+    String result;
+
+    if (isUnescapedQuote(s, length - 1)) {
+      int index = lastUnescapedIndexOf(s, length - 1, '"');
+      assertIndex(s, index, "Could not find start quote");
+      result = s.substring(index + 1, length - 1);
+    }
+    else {
+      int index = lastUnescapedIndexOf(s, length, ' ');
+      assertIndex(s, index, "Could not find separating space");
+      result = s.substring(index + 1);
+    }
+
+    return unescape(result);
+  }
+
+  private static void assertIndex(@NotNull String s, int index, @NotNull String message) throws SvnBindException {
+    if (index < 0) {
+      throw new SvnBindException(message + " - " + s);
+    }
+  }
+
+  @NotNull
+  private static String unescape(@NotNull String s) {
+    return s.replace("\\", "");
+  }
+
+  /**
+   * "from" index is excluded.
+   */
+  private static int lastUnescapedIndexOf(@NotNull String s, int from, char c) {
+    int result = from;
+
+    do {
+      result = s.lastIndexOf(c, result - 1);
+    }
+    while (result != -1 && !isUnescaped(s, result, c));
+
+    return result;
+  }
+
+  private static boolean isUnescapedQuote(@NotNull String s, int index) {
+    return isUnescaped(s, index, '"');
+  }
+
+  private static boolean isUnescaped(@NotNull String s, int index, char c) {
+    return StringUtil.isChar(s, index, c) && !StringUtil.isChar(s, index - 1, '\\');
+  }
+}