/*
* Copyright (c) 2008, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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
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*/
package build.tools.spp;
import java.util.*;
import java.util.regex.*;
/*
* Spp: A simple regex-based stream preprocessor based on Mark Reinhold's
* sed-based spp.sh
*
* Usage: java build.tools.spp.Spp [-be] [-nel] [-Kkey] -Dvar=value ... <in >out
*
* If -nel is declared then empty lines will not be substituted for lines of
* text in the template that do not appear in the output.
*
* Meaningful only at beginning of line, works with any number of keys:
*
* #if[key] Includes text between #if/#end if -Kkey specified,
* #else[key] otherwise changes text to blank lines; key test
* #end[key] may be negated by prefixing !, e.g., #if[!key]
*
* #begin If -be is specified then lines up to and including
* #end #begin, and from #end to EOF, are deleted
*
* #warn Changed into warning that file is generated
*
* // ## Changed into blank line
*
* Meaningful anywhere in line
*
* {#if[key]?yes} Expands to yes if -Kkey specified
* {#if[key]?yes:no} Expands to yes if -Kkey, otherwise no
* {#if[!key]?yes} Expands to yes if -Kother
* {#if[!key]?yes:no} Expands to yes if -Kother, otherwise no
* $var$ Expands to value if -Dvar=value given
*
* yes, no must not contain whitespace
*
* @author Xueming Shen
*/
public class Spp {
public static void main(String args[]) throws Exception {
Map<String, String> vars = new HashMap<>();
Set<String> keys = new HashSet<>();
boolean be = false;
boolean el = true;
for (String arg:args) {
if (arg.startsWith("-D")) {
int i = arg.indexOf('=');
vars.put(arg.substring(2, i),arg.substring(i+1));
} else if (arg.startsWith("-K")) {
keys.add(arg.substring(2));
} else if ("-be".equals(arg)) {
be = true;
} else if ("-nel".equals(arg)) {
el = false;
} else {
System.err.println("Usage: java build.tools.spp.Spp [-be] [-nel] [-Kkey] -Dvar=value ... <in >out");
System.exit(-1);
}
}
StringBuffer out = new StringBuffer();
new Spp().spp(new Scanner(System.in),
out, "",
keys, vars, be, el,
false);
System.out.print(out.toString());
}
static final String LNSEP = System.getProperty("line.separator");
static final String KEY = "([a-zA-Z0-9]+)";
static final String VAR = "([a-zA-Z0-9_\\-]+)";
static final String TEXT = "([a-zA-Z0-9&;,.<>/#() \\?\\[\\]\\$]+)"; // $ -- hack embedded $var$
static final int GN_NOT = 1;
static final int GN_KEY = 2;
static final int GN_YES = 3;
static final int GN_NO = 5;
static final int GN_VAR = 6;
final Matcher ifkey = Pattern.compile("^#if\\[(!)?" + KEY + "\\]").matcher("");
final Matcher elsekey = Pattern.compile("^#else\\[(!)?" + KEY + "\\]").matcher("");
final Matcher endkey = Pattern.compile("^#end\\[(!)?" + KEY + "\\]").matcher("");
final Matcher vardef = Pattern.compile("\\{#if\\[(!)?" + KEY + "\\]\\?" + TEXT + "(:"+ TEXT + ")?\\}|\\$" + VAR + "\\$").matcher("");
final Matcher vardef2 = Pattern.compile("\\$" + VAR + "\\$").matcher("");
void append(StringBuffer buf, String ln,
Set<String> keys, Map<String, String> vars) {
vardef.reset(ln);
while (vardef.find()) {
String repl = "";
if (vardef.group(GN_VAR) != null)
repl = vars.get(vardef.group(GN_VAR));
else {
boolean test = keys.contains(vardef.group(GN_KEY));
if (vardef.group(GN_NOT) != null)
test = !test;
repl = test?vardef.group(GN_YES):vardef.group(GN_NO);
if (repl == null)
repl = "";
else { // embedded $var$
while (vardef2.reset(repl).find()) {
repl = vardef2.replaceFirst(vars.get(vardef2.group(1)));
}
}
}
vardef.appendReplacement(buf, repl);
}
vardef.appendTail(buf);
}
// return true if #end[key], #end or EOF reached
boolean spp(Scanner in, StringBuffer buf, String key,
Set<String> keys, Map<String, String> vars,
boolean be, boolean el, boolean skip) {
while (in.hasNextLine()) {
String ln = in.nextLine();
if (be) {
if (ln.startsWith("#begin")) {
buf.setLength(0); //clean up to this line
continue;
}
if (ln.equals("#end")) {
while (in.hasNextLine())
in.nextLine();
return true; //discard the rest to EOF
}
}
if (ifkey.reset(ln).find()) {
String k = ifkey.group(GN_KEY);
boolean test = keys.contains(k);
if (ifkey.group(GN_NOT) != null)
test = !test;
if (el) buf.append(LNSEP);
if (!spp(in, buf, k, keys, vars, be, el, skip || !test)) {
spp(in, buf, k, keys, vars, be, el, skip || test);
}
continue;
}
if (elsekey.reset(ln).find()) {
if (!key.equals(elsekey.group(GN_KEY))) {
throw new Error("Mis-matched #if-else-end at line <" + ln + ">");
}
if (el) buf.append(LNSEP);
return false;
}
if (endkey.reset(ln).find()) {
if (!key.equals(endkey.group(GN_KEY))) {
throw new Error("Mis-matched #if-else-end at line <" + ln + ">");
}
if (el) buf.append(LNSEP);
return true;
}
if (ln.startsWith("#warn")) {
ln = "// -- This file was mechanically generated: Do not edit! -- //";
} else if (ln.trim().startsWith("// ##")) {
ln = "";
}
if (!skip) {
append(buf, ln, keys, vars);
if (!el) buf.append(LNSEP);
}
if (el) buf.append(LNSEP);
}
return true;
}
}