costin 01/06/05 22:48:38
Added: jasper34/generator/org/apache/jasper34/javagen
JavaSourceGenerator.java package.html
Log:
Refactoring of JspParseEventLisener - this is the jasper-independent
java code generator. It manage the line number, indentation, etc. More will
come to simplify the generation.
It is prefered to use specialized methods ( setClassName, setPakage, etc ) -
instead of prinln("package foo;") - that will help with direct code generation
( since a similar pattern will be used ), and may even allow using the
same code.
( nothing says that JavaSourceGenerator can generate only java, and not
directly bytecode ).
The intention is to create a AST and do some post-processings, detect if
we "understand" everything and generate bytecode directly ( if in development
mode - i.e. compilation times matters. For deployment it's still better
to compile via java )
Revision Changes Path
1.1
jakarta-tomcat-jasper/jasper34/generator/org/apache/jasper34/javagen/JavaSourceGenerator.java
Index: JavaSourceGenerator.java
===================================================================
/*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [EMAIL PROTECTED]
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.jasper34.javagen;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.StringReader;
import java.io.IOException;
import java.util.*;
//import org.apache.jasper34.generator.Mark;
/**
* This is what is used to generate java sources. It knows how to indent
* and will record line numbers and the match in the original source.
*
* @author Anil K. Vijendran
* @author Costin Manolache
*/
public class JavaSourceGenerator {
// public static int TAB_WIDTH = 4;
public static int INDENT = 2;
public static String SPACES = " ";
// Current indent level:
protected int indent = 0;
protected int javaLine=0;
// The sink writer:
protected PrintWriter writer;
public JavaSourceGenerator(PrintWriter writer) {
this.writer = writer;
}
public void close() throws IOException {
writer.close();
}
// -------------------- Generator tunning --------------------
boolean includeLineNumber=true;
public void setGenerateLineNumbers(boolean b ) {
}
// -------------------- Prepare generator --------------------
// File components
String packageName;
Vector imports=new Vector();
Vector interfaces=new Vector();
String className;
String extendClass;
public void setPackage( String p ) {
this.packageName=p;
}
public void addImport( String s ) {
imports.addElement( s );
}
public void setClassName( String classN ) {
this.className=classN;
}
public void setExtendClass( String s ) {
extendClass=s;
}
public void addInterface(String s) {
interfaces.addElement( s );
}
// -------------------- High level generator --------------------
public boolean needCompiler=false;
public void generateHeader() {
if( packageName != null && !"".equals(packageName)) {
println( "package " + packageName + ";");
println();
}
Enumeration e = imports.elements();
while (e.hasMoreElements())
println("import "+(String) e.nextElement()+";");
println();
}
public void generateClassHeader() {
println("public class "+ className );
if( extendClass != null ) {
pushIndent();
indent();
printlnNI( "extends " + extendClass );
popIndent();
}
if (interfaces.size() != 0) {
pushIndent();
indent();
print("implements ");
for(int i = 0; i < interfaces.size() - 1; i++)
print(" "+interfaces.elementAt(i)+",");
printlnNI(" "+interfaces.elementAt(interfaces.size()-1));
popIndent();
}
println( "{" );
pushIndent();
}
public void generateConstructor() {
println("public "+className+"( ) {");
println("}");
println();
}
public void generateClassFooter() {
// Generate line mapping
popIndent();
println( "}" );
}
// -------------------- Low level generator --------------------
/** Increase indentation level for next lines.
* Maximum 30 spaces.
*/
public void pushIndent() {
if ((indent += INDENT) > SPACES.length())
indent = SPACES.length();
}
public void popIndent() {
if ((indent -= INDENT) <= 0 )
indent = 0;
}
/**
* Quote the given string to make it appear in a chunk of java code.
* @param s The string to quote.
* @return The quoted string.
*/
public String quoteString(String s) {
// Turn null string into quoted empty strings:
if ( s == null )
return "null";
// Hard work:
if ( s.indexOf('"') < 0 && s.indexOf('\\') < 0 && s.indexOf ('\n') < 0
&& s.indexOf ('\r') < 0)
return "\""+s+"\"";
StringBuffer sb = new StringBuffer();
int len = s.length();
sb.append('"');
for (int i = 0 ; i < len ; i++) {
char ch = s.charAt(i);
if ( ch == '\\' && i+1 < len) {
sb.append('\\');
sb.append('\\');
sb.append(s.charAt(++i));
} else if ( ch == '"' ) {
sb.append('\\');
sb.append('"');
} else if (ch == '\n') {
sb.append ("\\n");
}else if (ch == '\r') {
sb.append ("\\r");
}else {
sb.append(ch);
}
}
sb.append('"');
return sb.toString();
}
/** Add a line to the java source
*/
public void println(String line) {
javaLine++;
writer.println(SPACES.substring(0, indent)+line);
}
public void printlnNI(String line) {
javaLine++;
writer.println(line);
}
/** Add an empty line to the java source
*/
public void println() {
javaLine++;
writer.println("");
}
public void indent() {
writer.print(SPACES.substring(0, indent));
}
public void print(String s) {
writer.print(s);
}
/** Print a java fragment.
*/
public void printMultiLn(String multiline) {
// Try to be smart (i.e. indent properly) at generating the code:
BufferedReader reader =
new BufferedReader(new StringReader(multiline));
try {
for (String line = null ; (line = reader.readLine()) != null ; )
println(line.trim());
} catch (IOException ex) {
// Unlikely to happen, since we're acting on strings
}
}
}
1.1
jakarta-tomcat-jasper/jasper34/generator/org/apache/jasper34/javagen/package.html
Index: package.html
===================================================================
<h2>java code generator</h2>
This package deals with generation of java sources ( indentation, line numbers, etc)
