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1447
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1 package luan.modules.parsers;
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2
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3 import goodjava.parser.Parser;
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4 import goodjava.parser.ParseException;
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5 import luan.Luan;
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6 import luan.LuanTable;
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7 import luan.LuanException;
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8
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9
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10 public final class LuanParser {
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11
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12 public static Object parse(Luan luan,String text) throws ParseException {
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13 return new LuanParser(luan,text).parse();
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14 }
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15
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16 private static final Object NULL = new Object();
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17 private final Luan luan;
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18 private final Parser parser;
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19
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20 private LuanParser(Luan luan,String text) {
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21 this.luan = luan;
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22 this.parser = new Parser(text);
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23 }
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24
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25 private ParseException exception(String msg) {
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26 return new ParseException(parser,msg);
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27 }
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28
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29 private Object parse() throws ParseException {
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30 do { spaces(); } while( endOfLine() );
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31 Object value = requiredValue();
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32 do { spaces(); } while( endOfLine() );
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33 if( !parser.endOfInput() )
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34 throw exception("unexpected text");
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35 return value;
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36 }
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37
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38 private Object requiredValue() throws ParseException {
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39 Object value = value();
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40 if( value == null )
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41 throw exception("invalid value");
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42 if( value == NULL )
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43 return null;
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44 return value;
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45 }
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46
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47 private Object value() throws ParseException {
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48 if( parser.match("nil") )
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49 return NULL;
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50 if( parser.match("true") )
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51 return Boolean.TRUE;
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52 if( parser.match("false") )
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53 return Boolean.FALSE;
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54 String s = string();
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55 if( s != null )
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56 return s;
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57 Number n = number();
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58 if( n != null )
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59 return n;
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60 LuanTable tbl = table();
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61 if( tbl != null )
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62 return tbl;
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63 return null;
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64 }
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65
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66 private String string() throws ParseException {
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67 parser.begin();
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68 if( !parser.match('"') )
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69 return parser.failure(null);
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70 StringBuilder sb = new StringBuilder();
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71 while( parser.anyChar() ) {
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72 char c = parser.lastChar();
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73 switch(c) {
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74 case '"':
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75 return parser.success(sb.toString());
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76 case '\\':
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77 if( parser.anyChar() ) {
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78 c = parser.lastChar();
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79 switch(c) {
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80 case '"':
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81 case '\'':
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82 case '\\':
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83 sb.append(c);
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84 continue;
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85 case 'b':
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86 sb.append('\b');
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87 continue;
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88 case 'f':
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89 sb.append('\f');
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90 continue;
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91 case 'n':
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92 sb.append('\n');
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93 continue;
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94 case 'r':
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95 sb.append('\r');
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96 continue;
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97 case 't':
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98 sb.append('\t');
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99 continue;
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100 case 'u':
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101 int n = 0;
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102 for( int i=0; i<4; i++ ) {
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103 int d;
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104 if( parser.inCharRange('0','9') ) {
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105 d = parser.lastChar() - '0';
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106 } else if( parser.inCharRange('a','f') ) {
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107 d = parser.lastChar() - 'a' + 10;
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108 } else if( parser.inCharRange('A','F') ) {
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109 d = parser.lastChar() - 'A' + 10;
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110 } else {
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111 throw exception("invalid hex digit");
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112 }
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113 n = 16*n + d;
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114 }
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115 sb.append((char)n);
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116 continue;
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117 }
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118 }
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119 throw exception("invalid escape char");
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120 default:
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121 sb.append(c);
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122 }
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123 }
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124 parser.failure();
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125 throw exception("unclosed string");
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126 }
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127
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128 private Number number() {
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129 parser.begin();
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130 if( parser.match("double") ) {
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131 Number n = inParens();
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132 if( n==null )
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133 return parser.failure(null);
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134 n = Luan.asDouble(n);
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135 if( n==null )
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136 return parser.failure(null);
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137 return n;
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138 } else if( parser.match("float") ) {
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139 Number n = inParens();
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140 if( n==null )
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141 return parser.failure(null);
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142 n = Luan.asFloat(n);
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143 if( n==null )
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144 return parser.failure(null);
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145 return n;
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146 } else if( parser.match("integer") ) {
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147 Number n = inParens();
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148 if( n==null )
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149 return parser.failure(null);
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150 n = Luan.asInteger(n);
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151 if( n==null )
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152 return parser.failure(null);
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153 return n;
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154 } else if( parser.match("long") ) {
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155 Number n = inParens();
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156 if( n==null )
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157 return parser.failure(null);
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158 n = Luan.asLong(n);
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159 if( n==null )
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160 return parser.failure(null);
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161 return n;
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162 } else {
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163 Number n = untypedNumber();
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164 if( n != null )
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165 return parser.success(n);
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166 else
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167 return parser.failure(null);
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168 }
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169 }
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170
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171 private Number inParens() {
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172 spaces();
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173 if( !parser.match('(') )
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174 return null;
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175 spaces();
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176 Number n = untypedNumber();
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177 if( n==null )
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178 return null;
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179 spaces();
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180 if( !parser.match(')') )
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181 return null;
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182 return n;
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183 }
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184
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185 private Number untypedNumber() {
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186 int start = parser.begin();
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187 boolean isFloat = false;
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188 parser.match('-');
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189 if( !parser.match('0') ) {
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190 if( !parser.inCharRange('1','9') )
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191 return parser.failure(null);
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192 while( parser.inCharRange('0','9') );
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193 }
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194 if( parser.match('.') ) {
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195 if( !parser.inCharRange('0','9') )
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196 return parser.failure(null);
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197 while( parser.inCharRange('0','9') );
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198 isFloat = true;
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199 }
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200 if( parser.anyOf("eE") ) {
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201 parser.anyOf("+-");
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202 if( !parser.inCharRange('0','9') )
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203 return parser.failure(null);
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204 while( parser.inCharRange('0','9') );
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205 isFloat = true;
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206 }
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207 String s = parser.textFrom(start);
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208 Number n;
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209 if(isFloat)
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210 n = Double.valueOf(s);
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211 else
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212 n = Long.valueOf(s);
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213 return parser.success(n);
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214 }
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215
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216 private LuanTable table() throws ParseException {
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217 parser.begin();
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218 if( !parser.match('{') )
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219 return parser.failure(null);
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220 LuanTable tbl = new LuanTable(luan);
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221 do {
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222 spaces();
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223 Object obj = value();
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224 if( obj != null ) {
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225 if( obj != NULL )
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226 tbl.rawAdd(obj);
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227 spaces();
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228 continue;
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229 }
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230 Object key = key();
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231 if( key != null ) {
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232 spaces();
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233 requiredMatch('=');
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234 spaces();
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235 Object value = requiredValue();
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236 spaces();
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237 try {
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238 tbl.rawPut(key,value);
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239 } catch(LuanException e) {
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240 throw new RuntimeException(e);
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241 }
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242 }
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243 } while( fieldSep() );
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244 requiredMatch('}');
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245 return parser.success(tbl);
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246 }
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247
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248 private Object key() throws ParseException {
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249 if( parser.match('[') ) {
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250 spaces();
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251 Object key = requiredValue();
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252 spaces();
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253 requiredMatch(']');
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254 return key;
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255 }
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256 int start = parser.currentIndex();
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257 if( nameFirstChar() ) {
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258 while( nameChar() );
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259 return parser.textFrom(start);
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260 }
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261 return null;
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262 }
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263
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264 private boolean nameChar() {
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265 return nameFirstChar() || parser.inCharRange('0','9');
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266 }
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267
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268 private boolean nameFirstChar() {
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269 return parser.inCharRange('a','z') || parser.inCharRange('A','Z') || parser.match('_');
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270 }
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271
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272 private boolean fieldSep() throws ParseException {
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273 return parser.anyOf(",;") || endOfLine();
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274 }
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275
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276 private boolean endOfLine() {
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277 return parser.match( "\r\n" ) || parser.match( '\r' ) || parser.match( '\n' );
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278 }
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279
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280 private void requiredMatch(char c) throws ParseException {
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281 if( !parser.match(c) )
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282 throw exception("'"+c+"' expected");
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283 }
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284
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285 private void spaces() {
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286 while( parser.anyOf(" \t") );
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287 }
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288
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289 }
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