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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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1562
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12 public static Object parse(String text) throws ParseException {
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13 return new LuanParser(text).parse();
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1447
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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 Parser parser;
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18
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1562
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19 private LuanParser(String text) {
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1447
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20 this.parser = new Parser(text);
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21 }
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22
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23 private ParseException exception(String msg) {
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24 return new ParseException(parser,msg);
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25 }
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26
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27 private Object parse() throws ParseException {
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28 do { spaces(); } while( endOfLine() );
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29 Object value = requiredValue();
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30 do { spaces(); } while( endOfLine() );
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31 if( !parser.endOfInput() )
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32 throw exception("unexpected text");
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33 return value;
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34 }
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35
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36 private Object requiredValue() throws ParseException {
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37 Object value = value();
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38 if( value == null )
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39 throw exception("invalid value");
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40 if( value == NULL )
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41 return null;
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42 return value;
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43 }
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44
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45 private Object value() throws ParseException {
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46 if( parser.match("nil") )
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47 return NULL;
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48 if( parser.match("true") )
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49 return Boolean.TRUE;
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50 if( parser.match("false") )
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51 return Boolean.FALSE;
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52 String s = string();
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53 if( s != null )
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54 return s;
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55 Number n = number();
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56 if( n != null )
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57 return n;
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58 LuanTable tbl = table();
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59 if( tbl != null )
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60 return tbl;
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61 return null;
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62 }
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63
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64 private String string() throws ParseException {
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65 parser.begin();
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66 if( !parser.match('"') )
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67 return parser.failure(null);
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68 StringBuilder sb = new StringBuilder();
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69 while( parser.anyChar() ) {
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70 char c = parser.lastChar();
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71 switch(c) {
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72 case '"':
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73 return parser.success(sb.toString());
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74 case '\\':
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75 if( parser.anyChar() ) {
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76 c = parser.lastChar();
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77 switch(c) {
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78 case '"':
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79 case '\'':
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80 case '\\':
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81 sb.append(c);
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82 continue;
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83 case 'b':
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84 sb.append('\b');
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85 continue;
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86 case 'f':
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87 sb.append('\f');
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88 continue;
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89 case 'n':
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90 sb.append('\n');
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91 continue;
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92 case 'r':
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93 sb.append('\r');
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94 continue;
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95 case 't':
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96 sb.append('\t');
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97 continue;
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98 case 'u':
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99 int n = 0;
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100 for( int i=0; i<4; i++ ) {
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101 int d;
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102 if( parser.inCharRange('0','9') ) {
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103 d = parser.lastChar() - '0';
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104 } else if( parser.inCharRange('a','f') ) {
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105 d = parser.lastChar() - 'a' + 10;
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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 {
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109 throw exception("invalid hex digit");
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110 }
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111 n = 16*n + d;
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112 }
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113 sb.append((char)n);
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114 continue;
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115 }
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116 }
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117 throw exception("invalid escape char");
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118 default:
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119 sb.append(c);
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120 }
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121 }
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122 parser.failure();
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123 throw exception("unclosed string");
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124 }
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125
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126 private Number number() {
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127 parser.begin();
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128 if( parser.match("double") ) {
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129 Number n = inParens();
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130 if( n==null )
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131 return parser.failure(null);
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132 n = Luan.asDouble(n);
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133 if( n==null )
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134 return parser.failure(null);
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135 return n;
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136 } else if( parser.match("float") ) {
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137 Number n = inParens();
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138 if( n==null )
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139 return parser.failure(null);
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140 n = Luan.asFloat(n);
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141 if( n==null )
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142 return parser.failure(null);
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143 return n;
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144 } else if( parser.match("integer") ) {
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145 Number n = inParens();
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146 if( n==null )
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147 return parser.failure(null);
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148 n = Luan.asInteger(n);
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149 if( n==null )
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150 return parser.failure(null);
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151 return n;
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152 } else if( parser.match("long") ) {
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153 Number n = inParens();
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154 if( n==null )
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155 return parser.failure(null);
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156 n = Luan.asLong(n);
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157 if( n==null )
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158 return parser.failure(null);
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159 return n;
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160 } else {
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161 Number n = untypedNumber();
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162 if( n != null )
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163 return parser.success(n);
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164 else
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165 return parser.failure(null);
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166 }
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167 }
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168
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169 private Number inParens() {
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170 spaces();
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171 if( !parser.match('(') )
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172 return null;
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173 spaces();
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174 Number n = untypedNumber();
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175 if( n==null )
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176 return null;
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177 spaces();
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178 if( !parser.match(')') )
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179 return null;
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180 return n;
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181 }
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182
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183 private Number untypedNumber() {
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184 int start = parser.begin();
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185 boolean isFloat = false;
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186 parser.match('-');
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187 if( !parser.match('0') ) {
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188 if( !parser.inCharRange('1','9') )
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189 return parser.failure(null);
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190 while( parser.inCharRange('0','9') );
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191 }
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192 if( parser.match('.') ) {
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193 if( !parser.inCharRange('0','9') )
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194 return parser.failure(null);
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195 while( parser.inCharRange('0','9') );
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196 isFloat = true;
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197 }
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198 if( parser.anyOf("eE") ) {
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199 parser.anyOf("+-");
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200 if( !parser.inCharRange('0','9') )
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201 return parser.failure(null);
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202 while( parser.inCharRange('0','9') );
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203 isFloat = true;
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204 }
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205 String s = parser.textFrom(start);
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206 Number n;
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207 if(isFloat)
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208 n = Double.valueOf(s);
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209 else
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210 n = Long.valueOf(s);
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211 return parser.success(n);
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212 }
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213
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214 private LuanTable table() throws ParseException {
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215 parser.begin();
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216 if( !parser.match('{') )
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217 return parser.failure(null);
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1562
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218 LuanTable tbl = new LuanTable();
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1447
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219 do {
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220 spaces();
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221 Object obj = value();
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222 if( obj != null ) {
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223 if( obj != NULL )
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224 tbl.rawAdd(obj);
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225 spaces();
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226 continue;
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227 }
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228 Object key = key();
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229 if( key != null ) {
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230 spaces();
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231 requiredMatch('=');
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232 spaces();
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233 Object value = requiredValue();
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234 spaces();
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235 try {
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236 tbl.rawPut(key,value);
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237 } catch(LuanException e) {
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238 throw new RuntimeException(e);
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239 }
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240 }
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241 } while( fieldSep() );
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242 requiredMatch('}');
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243 return parser.success(tbl);
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244 }
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245
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246 private Object key() throws ParseException {
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247 if( parser.match('[') ) {
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248 spaces();
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249 Object key = requiredValue();
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250 spaces();
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251 requiredMatch(']');
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252 return key;
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253 }
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254 int start = parser.currentIndex();
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255 if( nameFirstChar() ) {
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256 while( nameChar() );
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257 return parser.textFrom(start);
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258 }
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259 return null;
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260 }
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261
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262 private boolean nameChar() {
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263 return nameFirstChar() || parser.inCharRange('0','9');
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264 }
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265
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266 private boolean nameFirstChar() {
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267 return parser.inCharRange('a','z') || parser.inCharRange('A','Z') || parser.match('_');
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268 }
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269
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270 private boolean fieldSep() throws ParseException {
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271 return parser.anyOf(",;") || endOfLine();
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272 }
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273
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274 private boolean endOfLine() {
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275 return parser.match( "\r\n" ) || parser.match( '\r' ) || parser.match( '\n' );
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276 }
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277
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278 private void requiredMatch(char c) throws ParseException {
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279 if( !parser.match(c) )
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280 throw exception("'"+c+"' expected");
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281 }
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282
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283 private void spaces() {
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284 while( parser.anyOf(" \t") );
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285 }
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286
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287 }
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