113 lines
4.0 KiB
Java
113 lines
4.0 KiB
Java
/*
|
|
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* This code is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
package combo;
|
|
|
|
import java.util.regex.Matcher;
|
|
import java.util.regex.Pattern;
|
|
|
|
/**
|
|
* A combo parameter represents an 'hole' in a template that can be replaced with a given string.
|
|
* The schema of such holes is defined in {@link ComboParameter#pattern}; the main routine for
|
|
* replacing holes in a template scheme is {@link ComboParameter#expandTemplate(String, Resolver)}.
|
|
*/
|
|
public interface ComboParameter {
|
|
|
|
/**
|
|
* A combo parameter can take the form:
|
|
* <p>
|
|
* #{MAJOR}
|
|
* #{MAJOR.}
|
|
* #{MAJOR.MINOR}
|
|
* <p>
|
|
* where MAJOR can be IDENTIFIER or IDENTIFIER[NUMERIC_INDEX]
|
|
* and MINOR can be an identifier.
|
|
*/
|
|
Pattern pattern = Pattern.compile("#\\{([A-Z_][A-Z0-9_]*(?:\\[\\d+\\])?)(?:\\.([A-Z0-9_]*))?\\}");
|
|
|
|
/**
|
|
* Entry point for the customizable replacement logic. Subclasses must implement this method to
|
|
* specify how a given template hole should be expanded. An optional contextual argument is passed
|
|
* in as parameter, to make expansion more flexible.
|
|
*/
|
|
String expand(String optParameter);
|
|
|
|
/**
|
|
* Helper class for defining 'constant' combo parameters - i.e. parameters that always expand
|
|
* as a given string value - regardless of the context.
|
|
*/
|
|
class Constant<D> implements ComboParameter {
|
|
|
|
D data;
|
|
|
|
public Constant(D data) {
|
|
this.data = data;
|
|
}
|
|
|
|
@Override
|
|
public String expand(String _unused) {
|
|
return String.valueOf(data);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Helper interface used to lookup parameters given a parameter name.
|
|
*/
|
|
interface Resolver {
|
|
ComboParameter lookup(String name);
|
|
}
|
|
|
|
/**
|
|
* Main routine for replacing holes in a template string. Holes are repeatedly searches, their
|
|
* corresponding parameters retrieved, and replaced through expansion; since an expansion can
|
|
* lead to more holes, the process has to be applied until a fixed point is reached.
|
|
*/
|
|
static String expandTemplate(String template, Resolver resolver) {
|
|
CharSequence in = template;
|
|
StringBuffer out = new StringBuffer();
|
|
while (true) {
|
|
boolean more = false;
|
|
Matcher m = pattern.matcher(in);
|
|
while (m.find()) {
|
|
String parameterName = m.group(1);
|
|
String minor = m.group(2);
|
|
ComboParameter parameter = resolver.lookup(parameterName);
|
|
if (parameter == null) {
|
|
throw new IllegalStateException("Unhandled parameter name " + parameterName);
|
|
}
|
|
|
|
String replacement = parameter.expand(minor);
|
|
more |= pattern.matcher(replacement).find();
|
|
m.appendReplacement(out, replacement);
|
|
}
|
|
m.appendTail(out);
|
|
if (!more)
|
|
return out.toString();
|
|
else {
|
|
in = out;
|
|
out = new StringBuffer();
|
|
}
|
|
}
|
|
}
|
|
}
|