annotate src/goodjava/xml/XmlParser.java @ 1581:dbf63bef4b86

minor
author Franklin Schmidt <fschmidt@gmail.com>
date Thu, 11 Feb 2021 00:51:47 -0700
parents 35f3bfd4f51d
children 0246add03d11
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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 return element;
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37 }
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38
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39 private void prolog() throws ParseException {
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40 if( !parser.match("<?xml") )
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41 return;
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42 while( attribute() != null );
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43 spaces();
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44 required("?>");
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45 }
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46
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47 private XmlElement element() throws ParseException {
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48 parser.begin();
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49 if( !parser.match('<') || parser.test('/') )
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50 return parser.failure(null);
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51 //spaces();
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52 String name = name();
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53 if( name==null )
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54 throw exception("element name not found");
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55 Map<String,String> attributes = new LinkedHashMap<String,String>();
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56 Map.Entry<String,String> attribute;
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57 while( (attribute=attribute()) != null ) {
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58 attributes.put(attribute.getKey(),attribute.getValue());
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59 }
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60 spaces();
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61 if( parser.match("/>") ) {
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62 XmlElement element = new XmlElement(name,attributes);
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63 return parser.success(element);
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64 }
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65 required(">");
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66 String s = string(name);
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67 if( s != null ) {
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68 XmlElement element = new XmlElement(name,attributes,s);
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69 return parser.success(element);
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70 }
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71 List<XmlElement> elements = elements(name);
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72 if( elements != null ) {
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73 XmlElement element = new XmlElement(name,attributes,elements.toArray(new XmlElement[0]));
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74 return parser.success(element);
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75 }
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76 throw exception("bad element");
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77 }
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78
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79 private String string(String name) throws ParseException {
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80 int start = parser.begin();
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81 while( parser.noneOf("<") );
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82 String s = parser.textFrom(start);
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83 s = decode(s);
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84 if( !endTag(name) )
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85 return parser.failure(null);
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86 return parser.success(s);
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87 }
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88
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89 private List<XmlElement> elements(String name) throws ParseException {
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90 parser.begin();
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91 List<XmlElement> elements = new ArrayList<XmlElement>();
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92 spaces();
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93 XmlElement element;
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94 while( (element=element()) != null ) {
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95 elements.add(element);
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96 spaces();
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97 }
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98 if( !endTag(name) )
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99 return parser.failure(null);
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100 return parser.success(elements);
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101 }
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102
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103 private boolean endTag(String name) throws ParseException {
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104 parser.begin();
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105 if( !parser.match("</") || !parser.match(name) )
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106 return parser.failure();
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107 spaces();
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108 if( !parser.match('>') )
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109 return parser.failure();
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110 return parser.success();
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111 }
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112
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113 private Map.Entry<String,String> attribute() throws ParseException {
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114 parser.begin();
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115 if( !matchSpace() )
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116 return parser.failure(null);
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117 spaces();
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118 String name = name();
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119 if( name==null )
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120 return parser.failure(null);
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121 spaces();
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122 required("=");
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123 spaces();
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124 if( !parser.anyOf("\"'") )
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125 throw exception("quote expected");
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126 char quote = parser.lastChar();
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127 int start = parser.currentIndex();
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128 while( !parser.test(quote) ) {
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129 if( !parser.anyChar() )
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130 throw exception("unclosed attribute value");
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131 }
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132 String value = parser.textFrom(start);
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133 value = decode(value);
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134 parser.match(quote);
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135 Map.Entry<String,String> attribute = new AbstractMap.SimpleImmutableEntry<String,String>(name,value);
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136 return parser.success(attribute);
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137 }
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138
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139 private String name() {
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140 int start = parser.currentIndex();
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141 if( !matchNameChar() )
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142 return null;
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143 while( matchNameChar() );
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144 return parser.textFrom(start);
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145 }
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146
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147 private boolean matchNameChar() {
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148 return parser.inCharRange('a','z')
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149 || parser.inCharRange('A','Z')
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150 || parser.inCharRange('0','9')
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151 || parser.anyOf("_.-:")
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152 ;
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153 }
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154
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155 private void required(String s) throws ParseException {
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156 if( !parser.match(s) )
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157 exception("'"+s+"' expected");
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158 }
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159
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160 private void spaces() throws ParseException {
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161 while( matchSpace() || matchComment() );
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162 }
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163
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164 private boolean matchComment() throws ParseException {
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165 if( !parser.match("<!--") )
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166 return false;
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167 while( !parser.match("-->") ) {
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168 if( !parser.anyChar() )
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169 throw exception("unclosed comment");
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170 }
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171 return true;
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172 }
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173
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174 private boolean matchSpace() {
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175 return parser.anyOf(" \t\r\n");
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176 }
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177
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178 private static String decode(String s) {
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179 s = s.replace("&lt;","<");
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180 s = s.replace("&gt;",">");
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181 s = s.replace("&quot;","\"");
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182 s = s.replace("&apos;","'");
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183 s = s.replace("&amp;","&");
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184 return s;
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185 }
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186
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187 }