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996
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1 // MultiLexer.cpp
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2
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3 #include "lib.h"
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4 #include "MultiLexer.h"
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5 #include "Error.h"
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6
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7 using namespace std;
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8
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9 MultiLexer::MultiLexer()
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10 : state(EMPTY)
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11 , openChar('\0')
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12 , closeChar('\0')
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13 {
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14 }
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15
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16 void MultiLexer::reset(void)
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17 {
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18 token.clear();
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19 state = EMPTY;
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20 openChar = '\0';
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21 closeChar = '\0';
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22 }
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23
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24 void MultiLexer::add(char letter)
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25 {
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26 switch (state)
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27 {
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28 case EMPTY:
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29 if (letter == '{')
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30 {
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31 state = FUNCTION_BEGIN;
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32 openChar = '{';
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33 closeChar = '}';
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34 }
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35 else if (letter == '}')
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36 {
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37 state = FUNCTION_BEGIN;
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38 openChar = '}';
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39 closeChar = '{';
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40 }
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41 else if (letter == '[')
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42 {
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43 state = CONSTANT_BEGIN;
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44 openChar = '[';
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45 closeChar = ']';
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46 }
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47 else if (letter == ']')
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48 {
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49 state = CONSTANT_BEGIN;
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50 openChar = ']';
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51 closeChar = '[';
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52 }
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53 else if (letter == '(')
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54 {
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55 state = VARIABLE_BEGIN;
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56 openChar = '(';
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57 closeChar = ')';
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58 }
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59 else if (letter == ')')
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60 {
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61 state = VARIABLE_BEGIN;
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62 openChar = ')';
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63 closeChar = '(';
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64 }
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65 else
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66 {
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67 throw InternalException(string("Invalid opening character: '") + letter + "'");
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68 }
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69 break;
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70 case FUNCTION_BEGIN:
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71 case FUNCTION_END:
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72 inFunction(letter);
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73 break;
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74 case CONSTANT_BEGIN:
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75 case CONSTANT_END:
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76 case ESCAPE_BEGIN:
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77 case ESCAPE_END:
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78 inConstant(letter);
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79 break;
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80 case VARIABLE_BEGIN:
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81 if (letter == openChar || letter == '{' || letter == '}' || letter == '\'')
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82 {
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83 throw CrashException(Error::invalidCharInVariableName);
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84 }
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85 else if (letter == closeChar)
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86 {
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87 state = USE_END;
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88 }
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89 else if (letter == '!')
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90 {
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91 state = BIND_BEGIN;
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92 }
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93 else
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94 {
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95 state = USE_BEGIN;
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96 token.push_back(letter);
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97 }
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98 break;
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99 case USE_BEGIN:
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100 case USE_END:
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101 inUse(letter);
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102 break;
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103 case BIND_BEGIN:
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104 case BIND_MIDDLE:
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105 case BIND_END:
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106 inBind(letter);
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107 break;
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108 default:
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109 throw InternalException("Unknown state in MultiLexer: "
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110 + intToString(state));
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111 break;
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112 }
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113 }
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114
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115 bool MultiLexer::isStarted(void) const
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116 {
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117 return state != EMPTY;
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118 }
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119
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120 bool MultiLexer::isDone(void) const
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121 {
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122 return isFunction() || isConstant() || isUse() || isBind();
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123 }
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124
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125 bool MultiLexer::isFunction(void) const
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126 {
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127 return state == FUNCTION_END;
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128 }
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129
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130 bool MultiLexer::isConstant(void) const
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131 {
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132 return state == CONSTANT_END;
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133 }
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134
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135 bool MultiLexer::isUse(void) const
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136 {
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137 return state == USE_END;
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138 }
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139
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140 bool MultiLexer::isBind(void) const
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141 {
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142 return state == BIND_END;
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143 }
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144
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145 string const & MultiLexer::getToken(void) const
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146 {
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147 return token;
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148 }
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149
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150 void MultiLexer::inFunction(char letter)
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151 {
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152 switch (state)
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153 {
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154 case FUNCTION_BEGIN:
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155 if (letter == '\'' || letter == openChar || letter == '!' || letter == '('
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156 || letter == ')')
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157 {
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158 throw CrashException(Error::invalidCharInFunctionName);
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159 }
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160 else if (letter == closeChar)
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161 {
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162 state = FUNCTION_END;
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163 }
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164 else
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165 {
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166 state = FUNCTION_BEGIN;
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167 token.push_back(letter);
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168 }
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169 break;
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170 case FUNCTION_END:
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171 tooManyLetters(letter);
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172 break;
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173 }
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174 }
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175
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176 void MultiLexer::inConstant(char letter)
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177 {
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178 switch (state)
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179 {
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180 case CONSTANT_BEGIN:
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181 if (letter == '\\')
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182 {
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183 state = ESCAPE_BEGIN;
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184 }
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185 else if (letter == openChar)
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186 {
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187 throw CrashException(Error::invalidCharInConstant);
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188 }
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189 else if (letter == closeChar)
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190 {
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191 state = CONSTANT_END;
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192 }
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193 else
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194 {
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195 state = CONSTANT_BEGIN;
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196 token.push_back(letter);
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197 }
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198 break;
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199 case CONSTANT_END:
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200 tooManyLetters(letter);
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201 break;
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202 case ESCAPE_BEGIN:
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203 if (letter == '\\')
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204 {
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205 state = CONSTANT_BEGIN;
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206 token.push_back('\\');
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207 }
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208 else if (letter == 'n')
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209 {
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210 state = ESCAPE_END;
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211 token.push_back('\n');
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212 }
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213 else if (letter == 't')
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214 {
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215 state = ESCAPE_END;
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216 token.push_back('\t');
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217 }
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218 else if (letter == '[')
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219 {
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220 state = ESCAPE_END;
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221 token.push_back('[');
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222 }
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223 else if (letter == ']')
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224 {
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225 state = ESCAPE_END;
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226 token.push_back(']');
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227 }
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228 else
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229 {
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230 throw CrashException(Error::invalidEscapeSequence);
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231 }
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232 break;
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233 case ESCAPE_END:
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234 if (letter == '\\')
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235 {
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236 state = CONSTANT_BEGIN;
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237 }
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238 else
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239 {
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240 throw CrashException(Error::invalidEscapeSequence);
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241 }
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242 break;
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243 }
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244 }
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245
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246 void MultiLexer::inUse(char letter)
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247 {
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248 switch (state)
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249 {
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250 case USE_BEGIN:
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251 if (letter == openChar || letter == '!' || letter == '{' || letter == '}'
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252 || letter == '\'')
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253 {
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254 throw CrashException(Error::invalidCharInVariableName);
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255 }
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256 else if (letter == closeChar)
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257 {
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258 state = USE_END;
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259 }
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260 else
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261 {
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262 state = USE_BEGIN;
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263 token.push_back(letter);
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264 }
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265 break;
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266 case USE_END:
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267 tooManyLetters(letter);
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268 break;
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269 }
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270 }
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271
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272 void MultiLexer::inBind(char letter)
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273 {
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274 switch (state)
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275 {
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276 case BIND_BEGIN:
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277 if (letter == openChar || letter == closeChar || letter == '{'
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278 || letter == '}' || letter == '\'')
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279 {
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280 throw CrashException(Error::invalidCharInVariableName);
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281 }
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282 else if (letter == '!')
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283 {
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284 state = BIND_MIDDLE;
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285 }
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286 else
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287 {
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288 state = BIND_BEGIN;
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289 token.push_back(letter);
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290 }
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291 break;
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292 case BIND_MIDDLE:
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293 if (letter == closeChar)
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294 {
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295 state = BIND_END;
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296 }
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297 else
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298 {
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299 throw CrashException(Error::invalidCharInVariableName);
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300 }
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301 break;
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302 case BIND_END:
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303 tooManyLetters(letter);
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304 break;
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305 }
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306 }
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307
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308 void MultiLexer::tooManyLetters(char letter)
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309 {
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310 throw InternalException(string("MultiLexer is done but was sent a letter: '")
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311 + letter + "'");
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312 }
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