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annotate src/goodjava/xml/XmlParser.java @ 1817:969ced346cef
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| author | Franklin Schmidt <fschmidt@gmail.com> |
|---|---|
| date | Sun, 16 Jun 2024 20:00:50 -0600 |
| parents | 3dabc11da660 |
| children | 9daae8cf4bef |
| rev | line source |
|---|---|
| 1466 | 1 package goodjava.xml; |
| 2 | |
| 3 import java.util.Map; | |
| 4 import java.util.AbstractMap; | |
| 5 import java.util.LinkedHashMap; | |
| 6 import java.util.List; | |
| 7 import java.util.ArrayList; | |
| 1790 | 8 import java.util.regex.Pattern; |
| 9 import java.util.regex.Matcher; | |
| 1466 | 10 import goodjava.parser.Parser; |
| 11 import goodjava.parser.ParseException; | |
| 12 | |
| 13 | |
| 14 public final class XmlParser { | |
| 15 | |
| 1790 | 16 public static Xml parse(String text) throws ParseException { |
| 1466 | 17 return new XmlParser(text).parse(); |
| 18 } | |
| 19 | |
| 20 private final Parser parser; | |
| 21 | |
| 22 private XmlParser(String text) { | |
| 23 this.parser = new Parser(text); | |
| 24 } | |
| 25 | |
| 26 private ParseException exception(String msg) { | |
| 27 return new ParseException(parser,msg); | |
| 28 } | |
| 29 | |
| 1790 | 30 private Xml parse() throws ParseException { |
| 31 Xml xml = new Xml(); | |
| 1466 | 32 spaces(); |
| 1790 | 33 xml.declaration = declaration(); |
| 1466 | 34 spaces(); |
| 35 XmlElement element = element(); | |
| 36 spaces(); | |
| 37 if( !parser.endOfInput() ) | |
| 38 throw exception("unexpected text"); | |
|
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0246add03d11
dont allow empty xml
Franklin Schmidt <fschmidt@gmail.com>
parents:
1468
diff
changeset
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39 if( element==null ) |
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0246add03d11
dont allow empty xml
Franklin Schmidt <fschmidt@gmail.com>
parents:
1468
diff
changeset
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40 throw exception("empty document not allowed"); |
| 1790 | 41 xml.setElement(element); |
| 42 return xml; | |
| 1466 | 43 } |
| 44 | |
| 1790 | 45 private String declaration() throws ParseException { |
| 46 int start = parser.begin(); | |
| 1466 | 47 if( !parser.match("<?xml") ) |
| 1790 | 48 return parser.failure(null); |
| 1466 | 49 while( attribute() != null ); |
| 50 spaces(); | |
| 51 required("?>"); | |
| 1790 | 52 String s = parser.textFrom(start); |
| 53 return parser.success(s); | |
| 1466 | 54 } |
| 55 | |
| 56 private XmlElement element() throws ParseException { | |
| 57 parser.begin(); | |
| 58 if( !parser.match('<') || parser.test('/') ) | |
| 59 return parser.failure(null); | |
| 60 //spaces(); | |
| 61 String name = name(); | |
| 62 if( name==null ) | |
| 63 throw exception("element name not found"); | |
| 64 Map<String,String> attributes = new LinkedHashMap<String,String>(); | |
| 65 Map.Entry<String,String> attribute; | |
| 66 while( (attribute=attribute()) != null ) { | |
| 67 attributes.put(attribute.getKey(),attribute.getValue()); | |
| 68 } | |
| 69 spaces(); | |
| 1468 | 70 if( parser.match("/>") ) { |
| 71 XmlElement element = new XmlElement(name,attributes); | |
| 72 return parser.success(element); | |
| 73 } | |
| 1466 | 74 required(">"); |
| 75 String s = string(name); | |
| 76 if( s != null ) { | |
| 1790 | 77 XmlElement element = new XmlElement(name,attributes); |
| 78 element.setContent(s); | |
| 1466 | 79 return parser.success(element); |
| 80 } | |
| 81 List<XmlElement> elements = elements(name); | |
| 82 if( elements != null ) { | |
| 1790 | 83 XmlElement element = new XmlElement(name,attributes); |
| 84 element.setContent( elements.toArray(new XmlElement[0]) ); | |
| 1466 | 85 return parser.success(element); |
| 86 } | |
| 87 throw exception("bad element"); | |
| 88 } | |
| 89 | |
| 90 private String string(String name) throws ParseException { | |
| 91 int start = parser.begin(); | |
| 1815 | 92 while( matchComment() || parser.noneOf("<") ); |
| 1466 | 93 String s = parser.textFrom(start); |
| 1468 | 94 s = decode(s); |
| 1466 | 95 if( !endTag(name) ) |
| 96 return parser.failure(null); | |
| 97 return parser.success(s); | |
| 98 } | |
| 99 | |
| 100 private List<XmlElement> elements(String name) throws ParseException { | |
| 101 parser.begin(); | |
| 102 List<XmlElement> elements = new ArrayList<XmlElement>(); | |
| 103 spaces(); | |
| 104 XmlElement element; | |
| 105 while( (element=element()) != null ) { | |
| 106 elements.add(element); | |
| 107 spaces(); | |
| 108 } | |
| 109 if( !endTag(name) ) | |
| 110 return parser.failure(null); | |
| 111 return parser.success(elements); | |
| 112 } | |
| 113 | |
| 114 private boolean endTag(String name) throws ParseException { | |
| 115 parser.begin(); | |
| 116 if( !parser.match("</") || !parser.match(name) ) | |
| 117 return parser.failure(); | |
| 118 spaces(); | |
| 119 if( !parser.match('>') ) | |
| 120 return parser.failure(); | |
| 121 return parser.success(); | |
| 122 } | |
| 123 | |
| 124 private Map.Entry<String,String> attribute() throws ParseException { | |
| 125 parser.begin(); | |
| 126 if( !matchSpace() ) | |
| 127 return parser.failure(null); | |
| 128 spaces(); | |
| 129 String name = name(); | |
| 130 if( name==null ) | |
| 131 return parser.failure(null); | |
| 132 spaces(); | |
| 133 required("="); | |
| 134 spaces(); | |
| 135 if( !parser.anyOf("\"'") ) | |
| 136 throw exception("quote expected"); | |
| 137 char quote = parser.lastChar(); | |
| 138 int start = parser.currentIndex(); | |
| 139 while( !parser.test(quote) ) { | |
| 140 if( !parser.anyChar() ) | |
| 141 throw exception("unclosed attribute value"); | |
| 142 } | |
| 143 String value = parser.textFrom(start); | |
| 1468 | 144 value = decode(value); |
| 1466 | 145 parser.match(quote); |
| 146 Map.Entry<String,String> attribute = new AbstractMap.SimpleImmutableEntry<String,String>(name,value); | |
| 147 return parser.success(attribute); | |
| 148 } | |
| 149 | |
| 150 private String name() { | |
| 151 int start = parser.currentIndex(); | |
| 152 if( !matchNameChar() ) | |
| 153 return null; | |
| 154 while( matchNameChar() ); | |
| 155 return parser.textFrom(start); | |
| 156 } | |
| 157 | |
| 158 private boolean matchNameChar() { | |
| 159 return parser.inCharRange('a','z') | |
| 160 || parser.inCharRange('A','Z') | |
| 161 || parser.inCharRange('0','9') | |
| 162 || parser.anyOf("_.-:") | |
| 163 ; | |
| 164 } | |
| 165 | |
| 166 private void required(String s) throws ParseException { | |
| 167 if( !parser.match(s) ) | |
| 168 exception("'"+s+"' expected"); | |
| 169 } | |
| 170 | |
| 171 private void spaces() throws ParseException { | |
| 172 while( matchSpace() || matchComment() ); | |
| 173 } | |
| 174 | |
| 175 private boolean matchComment() throws ParseException { | |
| 176 if( !parser.match("<!--") ) | |
| 177 return false; | |
| 178 while( !parser.match("-->") ) { | |
| 179 if( !parser.anyChar() ) | |
| 180 throw exception("unclosed comment"); | |
| 181 } | |
| 182 return true; | |
| 183 } | |
| 184 | |
| 185 private boolean matchSpace() { | |
| 186 return parser.anyOf(" \t\r\n"); | |
| 187 } | |
| 188 | |
| 1790 | 189 private static final Pattern dec = Pattern.compile("&#(\\d+);"); |
| 190 | |
| 1468 | 191 private static String decode(String s) { |
| 1790 | 192 Matcher m = dec.matcher(s); |
| 193 StringBuffer sb = new StringBuffer(); | |
| 194 while( m.find() ) { | |
| 195 String d = m.group(1); | |
| 196 int i = Integer.parseInt(d); | |
| 197 d = String.valueOf((char)i); | |
| 198 m.appendReplacement(sb, d); | |
| 199 } | |
| 200 m.appendTail(sb); | |
| 201 s = sb.toString(); | |
| 1468 | 202 s = s.replace("<","<"); |
| 203 s = s.replace(">",">"); | |
| 204 s = s.replace(""","\""); | |
| 205 s = s.replace("'","'"); | |
| 206 s = s.replace("&","&"); | |
| 207 return s; | |
| 208 } | |
| 209 | |
| 1466 | 210 } |