author | emc |
Wed, 11 Sep 2013 08:30:58 -0400 | |
changeset 19936 | 41f7c3013d9b |
parent 19931 | f82b95ab8015 |
child 34752 | 9c262a013456 |
permissions | -rw-r--r-- |
19931 | 1 |
/* |
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package tools.javac.combo; |
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import java.util.Map; |
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import java.util.regex.Matcher; |
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import java.util.regex.Pattern; |
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/** |
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* A template into which tags of the form {@code #\{KEY\}} or |
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* {@code #\{KEY.SUBKEY\}} can be expanded. |
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*/ |
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public interface Template { |
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String expand(String selector); |
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interface Resolver { |
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public Template lookup(String key); |
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} |
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public static class Behavior { |
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/* Looks for expandable keys. An expandable key can take the form: |
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* #{MAJOR} |
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* #{MAJOR.} |
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* #{MAJOR.MINOR} |
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* where MAJOR can be IDENTIFIER or IDENTIFIER[NUMERIC_INDEX] |
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* and MINOR can be an identifier. |
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* |
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* The ability to have an empty minor is provided on the |
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* assumption that some tests that can be written with this |
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8024510: lib/combo/tools/javac/combo/TemplateTest.java fails
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* will find it useful to make a distinction akin to |
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8024510: lib/combo/tools/javac/combo/TemplateTest.java fails
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* distinguishing F from F(), where F is a function pointer, |
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* and also cases of #{FOO.#{BAR}}, where BAR expands to an |
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* empty string. |
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* |
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* However, this being a general-purpose framework, the exact |
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* use is left up to the test writers. |
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*/ |
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private static final Pattern pattern = Pattern.compile("#\\{([A-Z_][A-Z0-9_]*(?:\\[\\d+\\])?)(?:\\.([A-Z0-9_]*))?\\}"); |
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public static String expandTemplate(String template, final Map<String, Template> vars) { |
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return expandTemplate(template, new MapResolver(vars)); |
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} |
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public static String expandTemplate(String template, Resolver res) { |
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CharSequence in = template; |
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StringBuffer out = new StringBuffer(); |
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while (true) { |
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boolean more = false; |
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Matcher m = pattern.matcher(in); |
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while (m.find()) { |
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String major = m.group(1); |
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String minor = m.group(2); |
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Template key = res.lookup(major); |
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if (key == null) |
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throw new IllegalStateException("Unknown major key " + major); |
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String replacement = key.expand(minor == null ? "" : minor); |
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more |= pattern.matcher(replacement).find(); |
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m.appendReplacement(out, replacement); |
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} |
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m.appendTail(out); |
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if (!more) |
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return out.toString(); |
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else { |
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in = out; |
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out = new StringBuffer(); |
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} |
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} |
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} |
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} |
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} |
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class MapResolver implements Template.Resolver { |
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private final Map<String, Template> vars; |
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public MapResolver(Map<String, Template> vars) {this.vars = vars;} |
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public Template lookup(String key) { |
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return vars.get(key); |
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} |
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} |
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class ChainedResolver implements Template.Resolver { |
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private final Template.Resolver upstreamResolver, thisResolver; |
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public ChainedResolver(Template.Resolver upstreamResolver, Template.Resolver thisResolver) { |
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this.upstreamResolver = upstreamResolver; |
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this.thisResolver = thisResolver; |
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} |
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public Template.Resolver getUpstreamResolver() { |
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return upstreamResolver; |
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} |
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@Override |
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public Template lookup(String key) { |
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Template result = thisResolver.lookup(key); |
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if (result == null) |
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result = upstreamResolver.lookup(key); |
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return result; |
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} |
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} |