Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.g2d / src / org / simantics / g2d / utils / TextSegment.java

diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/utils/TextSegment.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/utils/TextSegment.java
new file mode 100644 (file)
index 0000000..2179dd2
--- /dev/null
+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/utils/TextSegment.java
@@ -0,0 +1,188 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.g2d.utils;\r
+\r
+import java.io.Serializable;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class TextSegment implements Serializable {\r
+\r
+    private static final long                 serialVersionUID = 1428883453597424952L;\r
+\r
+    public static transient final TextSegment EMPTY            = new TextSegment(0, 0);\r
+\r
+    private final int start;\r
+    private final int length;\r
+\r
+    public static TextSegment whole(String s) {\r
+        return new TextSegment(0, s.length());\r
+    }\r
+\r
+    public static TextSegment single(int pos) {\r
+        return new TextSegment(pos, 1);\r
+    }\r
+\r
+    public static TextSegment before(int pos) {\r
+        return new TextSegment(0, pos);\r
+    }\r
+\r
+    public TextSegment(int start, int length) {\r
+        this.start = start;\r
+        this.length = length;\r
+    }\r
+\r
+    public int start() {\r
+        return start;\r
+    }\r
+\r
+    public int end() {\r
+        return start + length;\r
+    }\r
+\r
+    public int length() {\r
+        return length;\r
+    }\r
+\r
+    public boolean isEmpty() {\r
+        return length == 0;\r
+    }\r
+\r
+    public boolean isWhole(String s) {\r
+        if (s == null)\r
+            return false;\r
+        return start == 0 && length == s.length();\r
+    }\r
+\r
+    public boolean atStart(int pos) {\r
+        return start == pos;\r
+    }\r
+\r
+    public boolean atEnd(int pos) {\r
+        return end() == pos;\r
+    }\r
+\r
+    public boolean existsIn(String s) {\r
+        int l = s != null ? s.length() : 0;\r
+        if (start > l)\r
+            return false;\r
+        int end = start + length;\r
+        if (end > l)\r
+            return false;\r
+        return true;\r
+    }\r
+\r
+    public String removeFrom(String s) {\r
+        if (!existsIn(s))\r
+            throw new IllegalArgumentException("segment " + this + " is out of bounds in string '" + s + "'");\r
+        if (length == 0)\r
+            return s;\r
+        if (start == 0)\r
+            return s.substring(length);\r
+        return s.substring(0, start) + s.substring(start + length);\r
+    }\r
+\r
+    public String before(String s) {\r
+        if (start == 0)\r
+            return "";\r
+        return s.substring(0, start);\r
+    }\r
+\r
+    public String after(String s) {\r
+        if (end() == s.length())\r
+            return "";\r
+        return s.substring(start, start + length);\r
+    }\r
+\r
+    public String of(String s) {\r
+        return s.substring(start, start + length);\r
+    }\r
+\r
+    public TextSegment beforeStart() {\r
+        if (start == 0)\r
+            return EMPTY;\r
+        return new TextSegment(0, start);\r
+    }\r
+\r
+    public TextSegment afterEnd(String s) {\r
+        int l = s.length();\r
+        int end = end();\r
+        if (end > l)\r
+            throw new IllegalArgumentException("end " + end + " is beyond string '" + s + "'");\r
+        if (end == l)\r
+            return EMPTY;\r
+        return new TextSegment(end, l - end);\r
+    }\r
+\r
+    public TextSegment prepend(int count) {\r
+        if (count == 0)\r
+            return this;\r
+        int newStart = start - count;\r
+        if (newStart < 0)\r
+            throw new IllegalArgumentException("prepending " + this + " by " + count + " procudes invalid segment start " + newStart);\r
+        int newLength = length + count;\r
+        if (newLength < 0)\r
+            throw new IllegalArgumentException("prepending " + this + " by " + count + " produces negative length: " + newLength);\r
+        return new TextSegment(start - count, newLength);\r
+    }\r
+\r
+    public TextSegment append(int count) {\r
+        if (count == 0)\r
+            return this;\r
+        int newLength = length + count;\r
+        if (newLength < 0)\r
+            throw new IllegalArgumentException("appending by " + count + " produces negative length: " + newLength);\r
+        return new TextSegment(start, newLength);\r
+    }\r
+\r
+    public TextSegment extendToEnd(String s) {\r
+        int l = s.length();\r
+        int end = end();\r
+        if (end > l)\r
+            throw new IllegalArgumentException("end " + end + " is beyond string '" + s + "'");\r
+        if (end == l)\r
+            return this;\r
+        return new TextSegment(start, l - start);\r
+    }\r
+\r
+    @Override\r
+    public int hashCode() {\r
+        final int prime = 31;\r
+        int result = 1;\r
+        result = prime * result + length;\r
+        result = prime * result + start;\r
+        return result;\r
+    }\r
+\r
+    @Override\r
+    public boolean equals(Object obj) {\r
+        if (this == obj)\r
+            return true;\r
+        if (obj == null)\r
+            return false;\r
+        if (getClass() != obj.getClass())\r
+            return false;\r
+        TextSegment other = (TextSegment) obj;\r
+        if (length != other.length)\r
+            return false;\r
+        if (start != other.start)\r
+            return false;\r
+        return true;\r
+    }\r
+\r
+    @Override\r
+    public String toString() {\r
+        return "[" + start + "," + (start + length) + "]"; \r
+    }\r
+\r
+}\r