annotate src/goodjava/xml/XmlParser.java @ 1802:ca98dee04e08

add Parsers.json_null
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 21 Apr 2024 21:25:15 -0600
parents a8c685a894b4
children 3dabc11da660
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1 package goodjava.xml;
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2
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3 import java.util.Map;
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4 import java.util.AbstractMap;
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5 import java.util.LinkedHashMap;
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6 import java.util.List;
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7 import java.util.ArrayList;
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8 import java.util.regex.Pattern;
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9 import java.util.regex.Matcher;
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10 import goodjava.parser.Parser;
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11 import goodjava.parser.ParseException;
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12
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13
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14 public final class XmlParser {
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15
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16 public static Xml parse(String text) throws ParseException {
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17 return new XmlParser(text).parse();
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18 }
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19
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20 private final Parser parser;
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21
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22 private XmlParser(String text) {
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23 this.parser = new Parser(text);
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24 }
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25
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26 private ParseException exception(String msg) {
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27 return new ParseException(parser,msg);
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28 }
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29
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30 private Xml parse() throws ParseException {
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31 Xml xml = new Xml();
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32 spaces();
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33 xml.declaration = declaration();
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34 spaces();
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35 XmlElement element = element();
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36 spaces();
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37 if( !parser.endOfInput() )
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38 throw exception("unexpected text");
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39 if( element==null )
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40 throw exception("empty document not allowed");
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41 xml.setElement(element);
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42 return xml;
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43 }
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44
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45 private String declaration() throws ParseException {
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46 int start = parser.begin();
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47 if( !parser.match("<?xml") )
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48 return parser.failure(null);
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49 while( attribute() != null );
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50 spaces();
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51 required("?>");
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52 String s = parser.textFrom(start);
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53 return parser.success(s);
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54 }
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55
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56 private XmlElement element() throws ParseException {
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57 parser.begin();
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58 if( !parser.match('<') || parser.test('/') )
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59 return parser.failure(null);
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60 //spaces();
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61 String name = name();
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62 if( name==null )
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63 throw exception("element name not found");
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64 Map<String,String> attributes = new LinkedHashMap<String,String>();
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65 Map.Entry<String,String> attribute;
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66 while( (attribute=attribute()) != null ) {
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67 attributes.put(attribute.getKey(),attribute.getValue());
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68 }
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69 spaces();
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70 if( parser.match("/>") ) {
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71 XmlElement element = new XmlElement(name,attributes);
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72 return parser.success(element);
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73 }
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74 required(">");
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75 String s = string(name);
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76 if( s != null ) {
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77 XmlElement element = new XmlElement(name,attributes);
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78 element.setContent(s);
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79 return parser.success(element);
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80 }
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81 List<XmlElement> elements = elements(name);
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82 if( elements != null ) {
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83 XmlElement element = new XmlElement(name,attributes);
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84 element.setContent( elements.toArray(new XmlElement[0]) );
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85 return parser.success(element);
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86 }
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87 throw exception("bad element");
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88 }
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89
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90 private String string(String name) throws ParseException {
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91 int start = parser.begin();
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92 while( parser.noneOf("<") );
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93 String s = parser.textFrom(start);
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94 s = decode(s);
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95 if( !endTag(name) )
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96 return parser.failure(null);
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97 return parser.success(s);
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98 }
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99
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100 private List<XmlElement> elements(String name) throws ParseException {
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101 parser.begin();
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102 List<XmlElement> elements = new ArrayList<XmlElement>();
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103 spaces();
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104 XmlElement element;
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105 while( (element=element()) != null ) {
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106 elements.add(element);
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107 spaces();
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108 }
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109 if( !endTag(name) )
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110 return parser.failure(null);
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111 return parser.success(elements);
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112 }
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113
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114 private boolean endTag(String name) throws ParseException {
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115 parser.begin();
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116 if( !parser.match("</") || !parser.match(name) )
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117 return parser.failure();
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118 spaces();
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119 if( !parser.match('>') )
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120 return parser.failure();
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121 return parser.success();
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122 }
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123
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124 private Map.Entry<String,String> attribute() throws ParseException {
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125 parser.begin();
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126 if( !matchSpace() )
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127 return parser.failure(null);
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128 spaces();
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129 String name = name();
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130 if( name==null )
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131 return parser.failure(null);
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132 spaces();
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133 required("=");
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134 spaces();
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135 if( !parser.anyOf("\"'") )
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136 throw exception("quote expected");
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137 char quote = parser.lastChar();
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138 int start = parser.currentIndex();
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139 while( !parser.test(quote) ) {
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140 if( !parser.anyChar() )
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141 throw exception("unclosed attribute value");
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142 }
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143 String value = parser.textFrom(start);
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144 value = decode(value);
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145 parser.match(quote);
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146 Map.Entry<String,String> attribute = new AbstractMap.SimpleImmutableEntry<String,String>(name,value);
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147 return parser.success(attribute);
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148 }
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149
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150 private String name() {
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151 int start = parser.currentIndex();
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152 if( !matchNameChar() )
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153 return null;
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154 while( matchNameChar() );
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155 return parser.textFrom(start);
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156 }
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157
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158 private boolean matchNameChar() {
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159 return parser.inCharRange('a','z')
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160 || parser.inCharRange('A','Z')
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161 || parser.inCharRange('0','9')
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162 || parser.anyOf("_.-:")
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163 ;
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164 }
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165
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166 private void required(String s) throws ParseException {
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167 if( !parser.match(s) )
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168 exception("'"+s+"' expected");
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169 }
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170
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171 private void spaces() throws ParseException {
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172 while( matchSpace() || matchComment() );
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173 }
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174
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175 private boolean matchComment() throws ParseException {
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176 if( !parser.match("<!--") )
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177 return false;
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178 while( !parser.match("-->") ) {
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179 if( !parser.anyChar() )
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180 throw exception("unclosed comment");
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181 }
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182 return true;
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183 }
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184
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185 private boolean matchSpace() {
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186 return parser.anyOf(" \t\r\n");
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187 }
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188
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189 private static final Pattern dec = Pattern.compile("&#(\\d+);");
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190
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191 private static String decode(String s) {
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192 Matcher m = dec.matcher(s);
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193 StringBuffer sb = new StringBuffer();
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194 while( m.find() ) {
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195 String d = m.group(1);
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196 int i = Integer.parseInt(d);
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197 d = String.valueOf((char)i);
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198 m.appendReplacement(sb, d);
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199 }
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200 m.appendTail(sb);
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201 s = sb.toString();
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202 s = s.replace("&lt;","<");
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203 s = s.replace("&gt;",">");
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204 s = s.replace("&quot;","\"");
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205 s = s.replace("&apos;","'");
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206 s = s.replace("&amp;","&");
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207 return s;
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208 }
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209
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210 }