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package org.apache.jasper.compiler;
import java.util.Stack;
import java.net.URL;
import java.net.MalformedURLException;
import org.apache.jasper.JspCompilationContext;
/**
* Mark represents a point in the JSP input.
*
* @author Anil K. Vijendran
*/
final class Mark {
int cursor, line, col; // position within current stream
int fileid; // fileid of current stream
String fileName; // name of the current file
String baseDir; // directory of file for current stream
char[] stream = null; // current stream
Stack includeStack = null; // stack of stream and stream state of streams
// that have included current stream
String encoding = null; // encoding of current file
private JspReader reader; // reader that owns this mark
// (so we can look up fileid's)
private JspCompilationContext ctxt;
/**
* Keep track of parser before parsing an included file.
* This class keeps track of the parser before we switch to parsing an
* included file. In other words, it's the parser's continuation to be
* reinstalled after the included file parsing is done.
*/
class IncludeState {
int cursor, line, col;
int fileid;
String fileName;
String baseDir;
String encoding;
char[] stream = null;
IncludeState(int inCursor, int inLine, int inCol, int inFileid,
String name, String inBaseDir, String inEncoding,
char[] inStream)
{
cursor = inCursor;
line = inLine;
col = inCol;
fileid = inFileid;
fileName = name;
baseDir = inBaseDir;
encoding = inEncoding;
stream = inStream;
}
}
/**
* Constructor
*
* @param reader JspReader this mark belongs to
* @param inStream current stream for this mark
* @param fileid id of requested jsp file
* @param name JSP file name
* @param inBaseDir base directory of requested jsp file
* @param inEncoding encoding of current file
*/
Mark(JspReader reader, char[] inStream, int fileid, String name,
String inBaseDir, String inEncoding)
{
this.reader = reader;
this.ctxt = reader.getJspCompilationContext();
this.stream = inStream;
this.cursor = 0;
this.line = 1;
this.col = 1;
this.fileid = fileid;
this.fileName = name;
this.baseDir = inBaseDir;
this.encoding = inEncoding;
this.includeStack = new Stack();
}
/**
* Constructor
*/
Mark(Mark other) {
this.reader = other.reader;
this.ctxt = other.reader.getJspCompilationContext();
this.stream = other.stream;
this.fileid = other.fileid;
this.fileName = other.fileName;
this.cursor = other.cursor;
this.line = other.line;
this.col = other.col;
this.baseDir = other.baseDir;
this.encoding = other.encoding;
// clone includeStack without cloning contents
includeStack = new Stack();
for ( int i=0; i < other.includeStack.size(); i++ ) {
includeStack.addElement( other.includeStack.elementAt(i) );
}
}
/**
* Constructor
*/
Mark(JspCompilationContext ctxt, String filename, int line, int col) {
this.reader = null;
this.ctxt = ctxt;
this.stream = null;
this.cursor = 0;
this.line = line;
this.col = col;
this.fileid = -1;
this.fileName = filename;
this.baseDir = "le-basedir";
this.encoding = "le-endocing";
this.includeStack = null;
}
/** Sets this mark's state to a new stream.
* It will store the current stream in it's includeStack.
* @param inStream new stream for mark
* @param inFileid id of new file from which stream comes from
* @param inBaseDir directory of file
* @param inEncoding encoding of new file
*/
public void pushStream(char[] inStream, int inFileid, String name,
String inBaseDir, String inEncoding)
{
// store current state in stack
includeStack.push(new IncludeState(cursor, line, col, fileid, fileName, baseDir,
encoding, stream) );
// set new variables
cursor = 0;
line = 1;
col = 1;
fileid = inFileid;
fileName = name;
baseDir = inBaseDir;
encoding = inEncoding;
stream = inStream;
}
/**
/* Restores this mark's state to a previously stored stream.
* @return null if there is no previous stream
* The previous Makr instance when the stream is pushed.
*/
public Mark popStream() {
// make sure we have something to pop
if ( includeStack.size() <= 0 ) {
return null;
}
// get previous state in stack
IncludeState state = (IncludeState) includeStack.pop( );
// set new variables
cursor = state.cursor;
line = state.line;
col = state.col;
fileid = state.fileid;
fileName = state.fileName;
baseDir = state.baseDir;
stream = state.stream;
return this;
}
// -------------------- Locator interface --------------------
public int getLineNumber() {
return line;
}
public int getColumnNumber() {
return col;
}
public String getSystemId() {
return getFile();
}
public String getPublicId() {
return null;
}
public String toString() {
return getFile()+"("+line+","+col+")";
}
public String getFile() {
return this.fileName;
}
/**
* Gets the URL of the resource with which this Mark is associated
*
* @return URL of the resource with which this Mark is associated
*
* @exception MalformedURLException if the resource pathname is incorrect
*/
public URL getURL() throws MalformedURLException {
return ctxt.getResource(getFile());
}
public String toShortString() {
return "("+line+","+col+")";
}
public boolean equals(Object other) {
if (other instanceof Mark) {
Mark m = (Mark) other;
return this.reader == m.reader && this.fileid == m.fileid
&& this.cursor == m.cursor && this.line == m.line
&& this.col == m.col;
}
return false;
}
/**
* @return true if this Mark is greather than the <code>other</code>
* Mark, false otherwise.
*/
public boolean isGreater(Mark other) {
boolean greater = false;
if (this.line > other.line) {
greater = true;
} else if (this.line == other.line && this.col > other.col) {
greater = true;
}
return greater;
}
}
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