annotate src/goodjava/xml/XmlParser.java @ 1752:b4fa42c1e999

minor
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 25 Jan 2023 12:22:09 -0700
parents 0246add03d11
children a8c685a894b4
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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 goodjava.parser.Parser;
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9 import goodjava.parser.ParseException;
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10
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11
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12 public final class XmlParser {
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13
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14 public static XmlElement parse(String text) throws ParseException {
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15 return new XmlParser(text).parse();
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16 }
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17
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18 private final Parser parser;
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19
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20 private XmlParser(String text) {
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21 this.parser = new Parser(text);
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22 }
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23
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24 private ParseException exception(String msg) {
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25 return new ParseException(parser,msg);
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26 }
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27
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28 private XmlElement parse() throws ParseException {
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29 spaces();
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30 prolog();
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31 spaces();
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32 XmlElement element = element();
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33 spaces();
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34 if( !parser.endOfInput() )
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35 throw exception("unexpected text");
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36 if( element==null )
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37 throw exception("empty document not allowed");
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38 return element;
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39 }
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40
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41 private void prolog() throws ParseException {
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42 if( !parser.match("<?xml") )
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43 return;
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44 while( attribute() != null );
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45 spaces();
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46 required("?>");
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47 }
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48
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49 private XmlElement element() throws ParseException {
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50 parser.begin();
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51 if( !parser.match('<') || parser.test('/') )
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52 return parser.failure(null);
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53 //spaces();
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54 String name = name();
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55 if( name==null )
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56 throw exception("element name not found");
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57 Map<String,String> attributes = new LinkedHashMap<String,String>();
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58 Map.Entry<String,String> attribute;
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59 while( (attribute=attribute()) != null ) {
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60 attributes.put(attribute.getKey(),attribute.getValue());
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61 }
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62 spaces();
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63 if( parser.match("/>") ) {
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64 XmlElement element = new XmlElement(name,attributes);
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65 return parser.success(element);
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66 }
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67 required(">");
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68 String s = string(name);
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69 if( s != null ) {
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70 XmlElement element = new XmlElement(name,attributes,s);
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71 return parser.success(element);
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72 }
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73 List<XmlElement> elements = elements(name);
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74 if( elements != null ) {
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75 XmlElement element = new XmlElement(name,attributes,elements.toArray(new XmlElement[0]));
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76 return parser.success(element);
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77 }
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78 throw exception("bad element");
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79 }
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80
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81 private String string(String name) throws ParseException {
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82 int start = parser.begin();
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83 while( parser.noneOf("<") );
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84 String s = parser.textFrom(start);
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85 s = decode(s);
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86 if( !endTag(name) )
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87 return parser.failure(null);
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88 return parser.success(s);
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89 }
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90
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91 private List<XmlElement> elements(String name) throws ParseException {
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92 parser.begin();
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93 List<XmlElement> elements = new ArrayList<XmlElement>();
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94 spaces();
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95 XmlElement element;
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96 while( (element=element()) != null ) {
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97 elements.add(element);
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98 spaces();
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99 }
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100 if( !endTag(name) )
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101 return parser.failure(null);
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102 return parser.success(elements);
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103 }
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104
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105 private boolean endTag(String name) throws ParseException {
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106 parser.begin();
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107 if( !parser.match("</") || !parser.match(name) )
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108 return parser.failure();
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109 spaces();
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110 if( !parser.match('>') )
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111 return parser.failure();
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112 return parser.success();
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113 }
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114
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115 private Map.Entry<String,String> attribute() throws ParseException {
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116 parser.begin();
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117 if( !matchSpace() )
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118 return parser.failure(null);
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119 spaces();
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120 String name = name();
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121 if( name==null )
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122 return parser.failure(null);
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123 spaces();
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124 required("=");
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125 spaces();
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126 if( !parser.anyOf("\"'") )
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127 throw exception("quote expected");
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128 char quote = parser.lastChar();
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129 int start = parser.currentIndex();
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130 while( !parser.test(quote) ) {
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131 if( !parser.anyChar() )
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132 throw exception("unclosed attribute value");
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133 }
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134 String value = parser.textFrom(start);
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135 value = decode(value);
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136 parser.match(quote);
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137 Map.Entry<String,String> attribute = new AbstractMap.SimpleImmutableEntry<String,String>(name,value);
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138 return parser.success(attribute);
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139 }
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140
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141 private String name() {
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142 int start = parser.currentIndex();
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143 if( !matchNameChar() )
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144 return null;
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145 while( matchNameChar() );
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146 return parser.textFrom(start);
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147 }
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148
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149 private boolean matchNameChar() {
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150 return parser.inCharRange('a','z')
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151 || parser.inCharRange('A','Z')
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152 || parser.inCharRange('0','9')
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153 || parser.anyOf("_.-:")
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154 ;
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155 }
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156
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157 private void required(String s) throws ParseException {
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158 if( !parser.match(s) )
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159 exception("'"+s+"' expected");
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160 }
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161
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162 private void spaces() throws ParseException {
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163 while( matchSpace() || matchComment() );
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164 }
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165
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166 private boolean matchComment() throws ParseException {
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167 if( !parser.match("<!--") )
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168 return false;
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169 while( !parser.match("-->") ) {
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170 if( !parser.anyChar() )
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171 throw exception("unclosed comment");
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172 }
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173 return true;
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174 }
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175
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176 private boolean matchSpace() {
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177 return parser.anyOf(" \t\r\n");
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178 }
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179
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180 private static String decode(String s) {
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181 s = s.replace("&lt;","<");
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182 s = s.replace("&gt;",">");
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183 s = s.replace("&quot;","\"");
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184 s = s.replace("&apos;","'");
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185 s = s.replace("&amp;","&");
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186 return s;
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187 }
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188
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189 }