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A strong typed high performance Java Template engine with .Net Razor like syntax
The newest version!
/*
* Copyright (C) 2013 The Rythm Engine project
* Gelin Luo
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.greenlaw110.rythm.internal.parser.build_in;
import com.greenlaw110.rythm.internal.*;
import com.greenlaw110.rythm.internal.parser.BlockCodeToken;
import com.greenlaw110.rythm.internal.parser.RemoveLeadingSpacesIfLineBreakParser;
import com.greenlaw110.rythm.logger.ILogger;
import com.greenlaw110.rythm.logger.Logger;
import com.greenlaw110.rythm.utils.S;
import com.greenlaw110.rythm.utils.TextBuilder;
import com.stevesoft.pat.Regex;
public class ForEachParser extends KeywordParserFactory {
private static final ILogger logger = Logger.get(ForEachParser.class);
public IParser create(final IContext ctx) {
return new RemoveLeadingSpacesIfLineBreakParser(ctx) {
public TextBuilder go() {
Regex r = new Regex(String.format(patternStr2(), dialect().a(), keyword()));
String remain = remain();
if (!r.search(remain)) {
raiseParseException("Error parsing @for statement, correct usage: @for(Type var: Iterable){...} or @for(int i = ...)");
}
int lineNo = ctx.currentLine();
final String matched = r.stringMatched();
boolean leadingLB = !isLastBuilderLiteral();
if (matched.startsWith("\n") || matched.endsWith("\n")) {
if (matched.startsWith("\n")) {
leadingLB = true;
lineNo++;
}
ctx.getCodeBuilder().addBuilder(new Token.StringToken("\n", ctx));
if (!matched.startsWith("\n")) {
Regex r0 = new Regex("\\n([ \\t\\x0B\\f]*).*");
if (r0.search(matched)) {
String blank = r0.stringMatched(1);
if (blank.length() > 0) {
ctx.getCodeBuilder().addBuilder(new Token.StringToken(blank, ctx));
}
}
}
} else {
Regex r0 = new Regex("([ \\t\\x0B\\f]*).*");
if (r0.search(matched)) {
String blank = r0.stringMatched(1);
if (blank.length() > 0) {
ctx.getCodeBuilder().addBuilder(new Token.StringToken(blank, ctx));
}
}
}
step(matched.length());
String s = r.stringMatched(2);
String sep = r.stringMatched(4);
if (!S.empty(sep)) {
sep = sep.replaceAll("(\\r?\\n)+", "\\\\n");
sep = S.stripBrace(sep).trim();
boolean hasQuotation = sep.startsWith("'");
if (hasQuotation) {
sep = S.strip(sep, "'", "'");
sep = "\"" + sep + "\"";
}
if ("".equals(sep)) sep = "\",\"";
else sep = ExpressionParser.processPositionPlaceHolder(sep);
}
final String separator = sep;
if (s.contains(";")) {
if (!ctx().getDialect().enableFreeForLoop()) {
throw new TemplateParser.NoFreeLoopException(ctx());
}
String s1 = "for ";
String s2 = "{ //line: " + lineNo + "\n\t";
if (null != sep) {
String varCursor = ctx.getCodeBuilder().newVarName();
s1 = "int " + varCursor + " = 0;//line: " + lineNo + "\nfor ";
s2 = s2 + "if (" + varCursor + "++ > 0) {p(" + separator + ");} //line: " + lineNo + "\n\t";
}
// get rid of the "{" if it is followed
processFollowingOpenBraceAndLineBreak(leadingLB);
return new BlockCodeToken(s1 + s + s2, ctx()) {
@Override
public void openBlock() {
ctx().pushBreak(IContext.Break.BREAK);
ctx().pushContinue(IContext.Continue.CONTINUE);
}
@Override
public void output() {
super.output();
}
@Override
public String closeBlock() {
ctx().popBreak();
return super.closeBlock();
}
};
} else {
s = S.stripBrace(s);
int pos0 = -1, pos1 = -1;
String iterable = null, varname = null, type = null;
if (s.matches("\\s*\".*")) {
iterable = s;
} else if (s.contains(" in ")) {
pos0 = s.indexOf(" in ");
pos1 = pos0 + 4;
} else if (s.contains(" <- ")) {
pos0 = s.indexOf(" <- ");
pos1 = pos0 + 4;
} else if (s.contains(":")) {
pos0 = s.indexOf(":");
pos1 = pos0 + 1;
} else {
// the for(Iterable) style
iterable = s;
}
if (-1 != pos0) {
String s1 = s.substring(0, pos0).trim();
iterable = s.substring(pos1, s.length());
if (s1.contains(" ")) {
pos0 = s1.lastIndexOf(" ");
type = s1.substring(0, pos0);
varname = s1.substring(pos0, s1.length());
} else {
varname = s1;
}
}
processFollowingOpenBraceAndLineBreak(leadingLB);
return new ForEachCodeToken(type, varname, iterable, ctx(), lineNo, separator);
}
}
};
}
@Override
public Keyword keyword() {
return Keyword.EACH;
}
// match for(int i=0; i<100;++i) {
protected String patternStr2() {
return "^\\n?[ \\t\\x0B\\f]*%s%s\\s*((?@()))(\\.join((?@())))?([ \\t\\x0B\\f]*\\n?)";
}
@Override
protected String patternStr() {
//return "^(%s%s(\\s*\\(\\s*)(((" + Patterns.Type + "\\s+)?)((" + Patterns.VarName + "))?)\\s*([\\:]?)\\s*(" + Patterns.Expression2 + ")(\\s*\\)?[\\s\\r\\n]*|[\\s\\r\\n]+)\\{?[\\s\\r\\n]*).*";
//return "^(((" + Patterns.Type + ")\\s+)?(" + Patterns.VarName + ")\\s*\\:\\s*)?(" + Patterns.Expression2 + ")$";
//return "^((([a-zA-Z0-9_\\.]+)(\\s*\\[\\s*\\]|\\s*(?@<>))?\\s+)?(" + Patterns.VarName + ")\\s*\\:\\s*)?(" + Patterns.Expression2 + ")$";
//return "^((([a-zA-Z0-9_\\.]+)(\\s*\\[\\s*\\]|\\s*(?@<>))?\\s+)?(" + Patterns.VarName + ")\\s*\\:\\s*)?(" + Patterns.Expression2 + ")$";
// this method not used anymore
return null;
}
}
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