| /* |
| * 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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; |
| } |
| } |
