initial quantum version

[phpeclipse.git] / archive / net.sourceforge.phpeclipse.quantum.sql / src / com / quantum / sql / parser / StringPointer.java

diff --git a/archive/net.sourceforge.phpeclipse.quantum.sql/src/com/quantum/sql/parser/StringPointer.java b/archive/net.sourceforge.phpeclipse.quantum.sql/src/com/quantum/sql/parser/StringPointer.java
new file mode 100644 (file)
index 0000000..846da29
--- /dev/null
+++ b/archive/net.sourceforge.phpeclipse.quantum.sql/src/com/quantum/sql/parser/StringPointer.java
@@ -0,0 +1,62 @@
+package com.quantum.sql.parser;
+
+public class StringPointer {
+       char[] value;
+       int offset = 0;
+       int mark = 0;
+       public StringPointer(String s) {
+               value = s.toCharArray();
+       }
+       /**
+        * Returns the next character. Will return 0 if at end of file, but that's not
+        * checkeable because it can be a valid character. You should check with isDone();
+        * @return
+        */
+       public char getNext() {
+               char retVal = (offset < value.length) ? value[offset] : 0;
+               offset++;
+               return retVal;
+       }
+       /**
+        * Returns the next character, without advancing the pointer.
+        *  Will return 0 if at end of file, but that's not
+        * checkeable because it can be a valid character. You should check with isDone();
+        * @return
+        */
+       public char peek() {
+               char retVal = (offset < value.length) ? value[offset] : 0;
+               return retVal;
+       }
+       /**
+        * Marks a poing of the stream to come back later (using reset());
+        */
+       public void mark() {
+               mark = offset;
+       }
+       /**
+        * Returns to a previously marked (with mark()) place.
+        */
+       public void reset() {
+               offset = mark;
+       }
+       /**
+        * Sets the pointer back a character, in fact 'pop'ing it back to the stream;
+        */
+       public void back() {
+               if (offset > 0) offset--;
+       }
+       
+       public int getOffset() {
+               return offset;
+       }
+       /**
+        * @return true if the stream is at an end
+        */
+       public boolean isDone() {
+               return offset >= value.length;
+       }
+       
+       public int getLength() {
+               return value.length;
+       }
+}