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CharStream (Apache Velocity 1.5 API)
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org.apache.velocity.runtime.parser</FONT>
<BR>
Interface CharStream</H2>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../org/apache/velocity/runtime/parser/VelocityCharStream.html" title="class in org.apache.velocity.runtime.parser">VelocityCharStream</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public interface <B>CharStream</B></DL>
</PRE>
<P>
This interface describes a character stream that maintains line and
column number positions of the characters. It also has the capability
to backup the stream to some extent. An implementation of this
interface is used in the TokenManager implementation generated by
JavaCCParser.
All the methods except backup can be implemented in any fashion. backup
needs to be implemented correctly for the correct operation of the lexer.
Rest of the methods are all used to get information like line number,
column number and the String that constitutes a token and are not used
by the lexer. Hence their implementation won't affect the generated lexer's
operation.
<P>
<P>
<HR>
<P>
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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#backup(int)">backup</A></B>(int&nbsp;amount)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Backs up the input stream by amount steps.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;char</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#BeginToken()">BeginToken</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the next character that marks the beginning of the next token.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#Done()">Done</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The lexer calls this function to indicate that it is done with the stream
and hence implementations can free any resources held by this class.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#getBeginColumn()">getBeginColumn</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the column number of the first character for current token (being
matched after the last call to BeginTOken).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#getBeginLine()">getBeginLine</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the line number of the first character for current token (being
matched after the last call to BeginTOken).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#getColumn()">getColumn</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I></I>&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#getEndColumn()">getEndColumn</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the column number of the last character for current token (being
matched after the last call to BeginTOken).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#getEndLine()">getEndLine</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the line number of the last character for current token (being
matched after the last call to BeginTOken).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#GetImage()">GetImage</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns a string made up of characters from the marked token beginning
to the current buffer position.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#getLine()">getLine</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I></I>&nbsp;</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;char[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#GetSuffix(int)">GetSuffix</A></B>(int&nbsp;len)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns an array of characters that make up the suffix of length 'len' for
the currently matched token.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;char</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#readChar()">readChar</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the next character from the selected input.</TD>
</TR>
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&nbsp;
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<A NAME="readChar()"><!-- --></A><H3>
readChar</H3>
<PRE>
char <B>readChar</B>()
throws <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Returns the next character from the selected input. The method
of selecting the input is the responsibility of the class
implementing this interface. Can throw any java.io.IOException.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="getColumn()"><!-- --></A><H3>
getColumn</H3>
<PRE>
int <B>getColumn</B>()</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I></I>
<P>
<DD>Returns the column position of the character last read.
<P>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#getEndColumn()"><CODE>getEndColumn()</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getLine()"><!-- --></A><H3>
getLine</H3>
<PRE>
int <B>getLine</B>()</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I></I>
<P>
<DD>Returns the line number of the character last read.
<P>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/velocity/runtime/parser/CharStream.html#getEndLine()"><CODE>getEndLine()</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="getEndColumn()"><!-- --></A><H3>
getEndColumn</H3>
<PRE>
int <B>getEndColumn</B>()</PRE>
<DL>
<DD>Returns the column number of the last character for current token (being
matched after the last call to BeginTOken).
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getEndLine()"><!-- --></A><H3>
getEndLine</H3>
<PRE>
int <B>getEndLine</B>()</PRE>
<DL>
<DD>Returns the line number of the last character for current token (being
matched after the last call to BeginTOken).
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getBeginColumn()"><!-- --></A><H3>
getBeginColumn</H3>
<PRE>
int <B>getBeginColumn</B>()</PRE>
<DL>
<DD>Returns the column number of the first character for current token (being
matched after the last call to BeginTOken).
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getBeginLine()"><!-- --></A><H3>
getBeginLine</H3>
<PRE>
int <B>getBeginLine</B>()</PRE>
<DL>
<DD>Returns the line number of the first character for current token (being
matched after the last call to BeginTOken).
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="backup(int)"><!-- --></A><H3>
backup</H3>
<PRE>
void <B>backup</B>(int&nbsp;amount)</PRE>
<DL>
<DD>Backs up the input stream by amount steps. Lexer calls this method if it
had already read some characters, but could not use them to match a
(longer) token. So, they will be used again as the prefix of the next
token and it is the implemetation's responsibility to do this right.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="BeginToken()"><!-- --></A><H3>
BeginToken</H3>
<PRE>
char <B>BeginToken</B>()
throws <A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Returns the next character that marks the beginning of the next token.
All characters must remain in the buffer between two successive calls
to this method to implement backup correctly.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="GetImage()"><!-- --></A><H3>
GetImage</H3>
<PRE>
<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>GetImage</B>()</PRE>
<DL>
<DD>Returns a string made up of characters from the marked token beginning
to the current buffer position. Implementations have the choice of returning
anything that they want to. For example, for efficiency, one might decide
to just return null, which is a valid implementation.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="GetSuffix(int)"><!-- --></A><H3>
GetSuffix</H3>
<PRE>
char[] <B>GetSuffix</B>(int&nbsp;len)</PRE>
<DL>
<DD>Returns an array of characters that make up the suffix of length 'len' for
the currently matched token. This is used to build up the matched string
for use in actions in the case of MORE. A simple and inefficient
implementation of this is as follows :
{
String t = GetImage();
return t.substring(t.length() - len, t.length()).toCharArray();
}
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="Done()"><!-- --></A><H3>
Done</H3>
<PRE>
void <B>Done</B>()</PRE>
<DL>
<DD>The lexer calls this function to indicate that it is done with the stream
and hence implementations can free any resources held by this class.
Again, the body of this function can be just empty and it will not
affect the lexer's operation.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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