annotate src/goodjava/json/JsonParser.java @ 1622:b7f8418fb7ba

minor
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 26 Jul 2021 11:51:56 -0600
parents 27efb1fcbcb5
children
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1 package goodjava.json;
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2
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3 import java.util.List;
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4 import java.util.ArrayList;
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5 import java.util.Map;
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6 import java.util.LinkedHashMap;
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7 import java.util.Collections;
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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 JsonParser {
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13
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14 public static Object parse(String text) throws ParseException {
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15 return new JsonParser(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 JsonParser(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 Object parse() throws ParseException {
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29 spaces();
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30 Object value = value();
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31 spaces();
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32 if( !parser.endOfInput() )
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33 throw exception("unexpected text");
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34 return value;
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35 }
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36
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37 private Object value() throws ParseException {
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38 if( parser.match("null") )
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39 return null;
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40 if( parser.match("true") )
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41 return Boolean.TRUE;
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42 if( parser.match("false") )
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43 return Boolean.FALSE;
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44 String s = string();
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45 if( s != null )
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46 return s;
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47 Number n = number();
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48 if( n != null )
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49 return n;
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50 List a = array();
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51 if( a != null )
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52 return a;
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53 Map o = object();
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54 if( o != null )
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55 return o;
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56 throw exception("invalid value");
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57 }
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58
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59 private String string() throws ParseException {
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60 parser.begin();
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61 if( !parser.match('"') )
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62 return parser.failure(null);
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63 StringBuilder sb = new StringBuilder();
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64 while( parser.anyChar() ) {
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65 char c = parser.lastChar();
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66 switch(c) {
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67 case '"':
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68 return parser.success(sb.toString());
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69 case '\\':
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70 if( parser.anyChar() ) {
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71 c = parser.lastChar();
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72 switch(c) {
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73 case '"':
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74 case '\'': // not in spec
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75 case '\\':
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76 case '/':
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77 sb.append(c);
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78 continue;
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79 case 'b':
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80 sb.append('\b');
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81 continue;
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82 case 'f':
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83 sb.append('\f');
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84 continue;
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85 case 'n':
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86 sb.append('\n');
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87 continue;
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88 case 'r':
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89 sb.append('\r');
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90 continue;
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91 case 't':
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92 sb.append('\t');
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93 continue;
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94 case 'u':
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95 int n = 0;
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96 for( int i=0; i<4; i++ ) {
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97 int d;
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98 if( parser.inCharRange('0','9') ) {
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99 d = parser.lastChar() - '0';
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100 } else if( parser.inCharRange('a','f') ) {
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101 d = parser.lastChar() - 'a' + 10;
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102 } else if( parser.inCharRange('A','F') ) {
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103 d = parser.lastChar() - 'A' + 10;
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104 } else {
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105 throw exception("invalid hex digit");
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106 }
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107 n = 16*n + d;
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108 }
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109 sb.append((char)n);
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110 continue;
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111 }
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112 }
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113 throw exception("invalid escape char");
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114 default:
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115 sb.append(c);
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116 }
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117 }
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118 parser.failure();
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119 throw exception("unclosed string");
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120 }
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121
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122 private Number number() {
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123 int start = parser.begin();
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124 boolean isFloat = false;
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125 parser.match('-');
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126 if( !parser.match('0') ) {
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127 if( !parser.inCharRange('1','9') )
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128 return parser.failure(null);
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129 while( parser.inCharRange('0','9') );
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130 }
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131 if( parser.match('.') ) {
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132 if( !parser.inCharRange('0','9') )
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133 return parser.failure(null);
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134 while( parser.inCharRange('0','9') );
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135 isFloat = true;
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136 }
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137 if( parser.anyOf("eE") ) {
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138 parser.anyOf("+-");
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139 if( !parser.inCharRange('0','9') )
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140 return parser.failure(null);
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141 while( parser.inCharRange('0','9') );
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142 isFloat = true;
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143 }
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144 String s = parser.textFrom(start);
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145 Number n;
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146 if(isFloat)
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147 n = Double.valueOf(s);
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148 else
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149 n = Long.valueOf(s);
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150 return parser.success(n);
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151 }
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152
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153 private List array() throws ParseException {
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154 parser.begin();
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155 if( !parser.match('[') )
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156 return parser.failure(null);
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157 spaces();
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158 if( parser.match(']') )
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159 return parser.success(Collections.emptyList());
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160 List list = new ArrayList();
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161 list.add( value() );
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162 spaces();
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163 while( parser.match(',') ) {
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164 spaces();
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165 list.add( value() );
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166 spaces();
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167 }
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168 if( parser.match(']') )
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169 return parser.success(list);
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170 if( parser.endOfInput() ) {
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171 parser.failure();
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172 throw exception("unclosed array");
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173 }
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174 throw exception("unexpected text in array");
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175 }
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176
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177 private Map object() throws ParseException {
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178 parser.begin();
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179 if( !parser.match('{') )
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180 return parser.failure(null);
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181 spaces();
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182 if( parser.match('}') )
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183 return parser.success(Collections.emptyMap());
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184 Map map = new LinkedHashMap();
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185 addEntry(map);
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186 while( parser.match(',') ) {
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187 spaces();
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188 addEntry(map);
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189 }
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190 if( parser.match('}') )
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191 return parser.success(map);
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192 if( parser.endOfInput() ) {
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193 parser.failure();
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194 throw exception("unclosed object");
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195 }
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196 throw exception("unexpected text in object");
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197 }
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198
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199 private void addEntry(Map map) throws ParseException {
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200 String key = string();
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201 if( key==null )
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202 throw exception("invalid object key");
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203 spaces();
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204 if( !parser.match(':') )
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205 throw exception("':' expected");
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206 spaces();
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207 Object value = value();
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208 spaces();
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209 map.put(key,value);
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210 }
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211
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212 private void spaces() {
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213 while( parser.anyOf(" \t\r\n") );
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214 }
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215
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216 }