Mercurial Hosting > luan
view core/src/luan/modules/parsers/BBCode.java @ 585:bb3818249dfb
add Parsers
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 14 Aug 2015 06:35:20 -0600 |
parents | |
children | 5fdbefa80146 |
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package luan.modules.parsers; public final class BBCode { public static String toHtml(String bbcode) { return new BBCode(bbcode,true).parse(); } public static String toText(String bbcode) { return new BBCode(bbcode,false).parse(); } private final Parser parser; private final boolean toHtml; private BBCode(String text,boolean toHtml) { this.parser = new Parser(text); this.toHtml = toHtml; } private String parse() { StringBuilder sb = new StringBuilder(); while( !parser.endOfInput() ) { String block = parseBlock(); if( block != null ) sb.append(block); else { sb.append( parser.currentChar() ); parser.anyChar(); } } return sb.toString(); } private String parseWellFormed() { StringBuilder sb = new StringBuilder(); while( !parser.endOfInput() ) { String block = parseBlock(); if( block != null ) { sb.append(block); continue; } if( couldBeTag() ) break; sb.append( parser.currentChar() ); parser.anyChar(); } return sb.toString(); } private boolean couldBeTag() { if( parser.currentChar() != '[' ) return false; return parser.testIgnoreCase("[b]") || parser.testIgnoreCase("[/b]") || parser.testIgnoreCase("[i]") || parser.testIgnoreCase("[/i]") || parser.testIgnoreCase("[u]") || parser.testIgnoreCase("[/u]") || parser.testIgnoreCase("[url]") || parser.testIgnoreCase("[url=") || parser.testIgnoreCase("[/url]") || parser.testIgnoreCase("[code]") || parser.testIgnoreCase("[/code]") || parser.testIgnoreCase("[img]") || parser.testIgnoreCase("[/img]") || parser.testIgnoreCase("[color=") || parser.testIgnoreCase("[/color]") || parser.testIgnoreCase("[size=") || parser.testIgnoreCase("[/size]") || parser.testIgnoreCase("[youtube]") || parser.testIgnoreCase("[/youtube]") || parser.testIgnoreCase("[quote]") || parser.testIgnoreCase("[quote=") || parser.testIgnoreCase("[/quote]") ; } private String parseBlock() { if( parser.currentChar() != '[' ) return null; String s; s = parseB(); if(s!=null) return s; s = parseI(); if(s!=null) return s; s = parseU(); if(s!=null) return s; s = parseUrl1(); if(s!=null) return s; s = parseUrl2(); if(s!=null) return s; s = parseCode(); if(s!=null) return s; s = parseImg(); if(s!=null) return s; s = parseColor(); if(s!=null) return s; s = parseSize(); if(s!=null) return s; s = parseYouTube(); if(s!=null) return s; s = parseQuote1(); if(s!=null) return s; s = parseQuote2(); if(s!=null) return s; return null; } private String parseB() { parser.begin(); if( !parser.matchIgnoreCase("[b]") ) return parser.failure(null); String content = parseWellFormed(); if( !parser.matchIgnoreCase("[/b]") ) return parser.failure(null); String rtn = toHtml ? "<b>"+content+"</b>" : content; return parser.success(rtn); } private String parseI() { parser.begin(); if( !parser.matchIgnoreCase("[i]") ) return parser.failure(null); String content = parseWellFormed(); if( !parser.matchIgnoreCase("[/i]") ) return parser.failure(null); String rtn = toHtml ? "<i>"+content+"</i>" : content; return parser.success(rtn); } private String parseU() { parser.begin(); if( !parser.matchIgnoreCase("[u]") ) return parser.failure(null); String content = parseWellFormed(); if( !parser.matchIgnoreCase("[/u]") ) return parser.failure(null); String rtn = toHtml ? "<u>"+content+"</u>" : content; return parser.success(rtn); } private String parseUrl1() { parser.begin(); if( !parser.matchIgnoreCase("[url]") ) return parser.failure(null); String url = parseRealUrl(); if( !parser.matchIgnoreCase("[/url]") ) return parser.failure(null); String rtn = toHtml ? "<a href='"+url+"'>"+url+"</u>" : url; return parser.success(rtn); } private String parseUrl2() { parser.begin(); if( !parser.matchIgnoreCase("[url=") ) return parser.failure(null); String url = parseRealUrl(); if( !parser.match(']') ) return parser.failure(null); String content = parseWellFormed(); if( !parser.matchIgnoreCase("[/url]") ) return parser.failure(null); String rtn = toHtml ? "<a href='"+url+"'>"+content+"</u>" : content; return parser.success(rtn); } private String parseRealUrl() { parser.begin(); while( parser.match(' ') ); int start = parser.currentIndex(); if( !parser.matchIgnoreCase("http") ) return parser.failure(null); parser.matchIgnoreCase("s"); if( !parser.matchIgnoreCase("://") ) return parser.failure(null); while( parser.noneOf(" []'") ); String url = parser.textFrom(start); while( parser.match(' ') ); return parser.success(url); } private String parseCode() { parser.begin(); if( !parser.matchIgnoreCase("[code]") ) return parser.failure(null); int start = parser.currentIndex(); while( !parser.testIgnoreCase("[/code]") ) { if( !parser.anyChar() ) return parser.failure(null); } String content = parser.textFrom(start); if( !parser.matchIgnoreCase("[/code]") ) throw new RuntimeException(); String rtn = toHtml ? "<code>"+content+"</code>" : content; return parser.success(rtn); } private String parseImg() { parser.begin(); if( !parser.matchIgnoreCase("[img]") ) return parser.failure(null); String url = parseRealUrl(); if( !parser.matchIgnoreCase("[/img]") ) return parser.failure(null); String rtn = toHtml ? "<img src='"+url+"'>" : ""; return parser.success(rtn); } private String parseColor() { parser.begin(); if( !parser.matchIgnoreCase("[color=") ) return parser.failure(null); int start = parser.currentIndex(); parser.match('#'); while( parser.inCharRange('0','9') || parser.inCharRange('a','z') || parser.inCharRange('A','Z') ); String color = parser.textFrom(start); if( !parser.match(']') ) return parser.failure(null); String content = parseWellFormed(); if( !parser.matchIgnoreCase("[/color]") ) return parser.failure(null); String rtn = toHtml ? "<span style='color: "+color+"'>"+content+"</span>" : content; return parser.success(rtn); } private String parseSize() { parser.begin(); if( !parser.matchIgnoreCase("[size=") ) return parser.failure(null); int start = parser.currentIndex(); while( parser.match('.') || parser.inCharRange('0','9') ); String size = parser.textFrom(start); if( !parser.match(']') ) return parser.failure(null); String content = parseWellFormed(); if( !parser.matchIgnoreCase("[/size]") ) return parser.failure(null); String rtn = toHtml ? "<span style='font-size: "+size+"em'>"+content+"</span>" : content; return parser.success(rtn); } private String parseYouTube() { parser.begin(); if( !parser.matchIgnoreCase("[youtube]") ) return parser.failure(null); int start = parser.currentIndex(); while( parser.inCharRange('0','9') || parser.inCharRange('a','z') || parser.inCharRange('A','Z') || parser.match('-') || parser.match('_') ); String id = parser.textFrom(start); if( id.length()==0 || !parser.matchIgnoreCase("[/youtube]") ) return parser.failure(null); String rtn = toHtml ? "<iframe width='420' height='315' src='https://www.youtube.com/embed/"+id+"' frameborder='0' allowfullscreen></iframe>" : ""; return parser.success(rtn); } private String parseQuote1() { parser.begin(); if( !parser.matchIgnoreCase("[quote]") ) return parser.failure(null); String content = parseWellFormed(); if( !parser.matchIgnoreCase("[/quote]") ) return parser.failure(null); String rtn = toHtml ? "<blockquote>"+content+"</blockquote>" : ""; return parser.success(rtn); } private String parseQuote2() { parser.begin(); if( !parser.matchIgnoreCase("[quote=") ) return parser.failure(null); int start = parser.currentIndex(); while( parser.noneOf("[];") ); String name = parser.textFrom(start).trim(); if( name.length() == 0 ) return parser.failure(null); String src = null; if( parser.match(';') ) { start = parser.currentIndex(); while( parser.noneOf("[]'") ); src = parser.textFrom(start).trim(); if( src.length() == 0 ) return parser.failure(null); } if( !parser.match(']') ) return parser.failure(null); String content = parseWellFormed(); if( !parser.matchIgnoreCase("[/quote]") ) return parser.failure(null); if( !toHtml ) return parser.success(""); StringBuilder sb = new StringBuilder(); sb.append( "<blockquote><div quoted>" ); if( src != null ) sb.append( "<a href='/thread?id=" ).append( src ).append( "'>" ); sb.append( name ).append( " wrote" ); if( src != null ) sb.append( "</a>" ); sb.append( ":</div>" ).append( content ).append( "</blockquote>" ); return parser.success(sb.toString()); } }