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Import AnaGram (near-)release tree into Mercurial.
author David A. Holland
date Sat, 22 Dec 2007 17:52:45 -0500
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1 {
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2 /*
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3 VM.SYN
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4
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5 Virtual Machine Compiler
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6 Copyright (c) 1997 Parsifal Software, All Rights Reserved.
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7
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8 The expression syntax is borrowed from C but with the
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9 addition of the FORTRAN exponentiation operator (**).
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10
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11 The cast, increment, and decrement operators are not
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12 implemented, nor are operations that are defined only
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13 for integers:
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14 Bitwise logical operators: &, |, ^, ~, &=, |=, ^=
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15 Remainder operators: %, %=
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16 Shift operators: <<, >>, >>=, <<=
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17
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18 The supported operations are:
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19 Assignment operators: =, +=, -=, *=, /=
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20 Conditional expressions: ? :
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21 Logical operators: !, &&, ||
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22 Comparison operators: ==, !=, <, <=, >, >=
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23 Binary arithmetic operators: +, -, *, /
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24 Exponentiation: **
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25 Unary arithmetic operators: +, -
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26 Parentheses
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27 Function calls
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28
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29 All arithmetic is double precision floating point.
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30
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31 Statements may include expression statements, blocks, if/else statements
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32 or while statements, following the rules of C.
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33
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34 The statement syntax has been written to avoid the conventional
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35 if/else ambiguity.
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36
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37 There are no declarations. All variables are presumed to be double.
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38
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39 Input strings may contain any number of statements. White space may be
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40 used freely, including both C and C++ style comments.
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41
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42 vmCompile makes the following external calls:
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43 void pushChar(int character);
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44 Push the specified character onto a character stack.
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45
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46 int locateVariable(int nameLength);
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47 Pop the last nameLength characters from the character stack
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48 and, treating them as the name of a variable, return an
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49 index into the variable array.
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50
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51 Overrides for macros defined by AnaGram, such as SYNTAX_ERROR
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52 are included in VMDEFS.H
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53
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54 VM.SYN is compiled with the AnaGram parser generator
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55 yielding VM.H and VM.CPP.
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56
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57 To build VM, compile VM.CPP and VMDEMO.CPP and link them
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58 with your C++ compiler.
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59
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60 For information about AnaGram, visit http://www.parsifalsoft.com.
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61 */
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62
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63 #include <math.h>
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64 #include "vmdefs.h" // defines external interface
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65
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66 static VirtualMachine *vm;
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67
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68 }
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69 // -- CONFIGURATION SECTION ----------------------------
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70 [
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71 default token type = double
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72 disregard white space
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73 lexeme {real, name}
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74 pointer input
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75 parser name = asil
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76 parser file name = "#.cpp"
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77 line numbers
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78 ]
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79
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80
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81 //parse option $
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82 // -> parse script, statements?, eof
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83 // -> skip statement, statement text?, ';'
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84 // -> skip statement, balanced braces
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85 // -> skip condition, balanced parens
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86 // -> eval expression, expression
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87 // -> exec statement, statement
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88
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89 //parse script, skip statement, skip condition, eval expression, exec statement
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90 // -> =asil_change_reduction(PCB, syntaxSelector);
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91
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92 (void) input string $ // specify grammar token
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93 -> statements?, eof
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94
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95 statement text
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96 -> statement char
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97 -> balanced parens
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98 -> statement text, statement char
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99 -> statement text, balanced parens
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100 -> statement text, balanced braces
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101
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102 blank = ' ' + '\t' + '\f' + '\v' + '\r' + '\n'
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103 statement char = 32..126 - blank - ';' - '(' - ')' - '{' - '}'
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104
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105 balanced parens
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106 -> '(', statement text?, ')'
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107
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108 balanced braces
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109 -> '{', statement text?, '}'
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110 -> '{', balanced braces, '}'
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111
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112 statement
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113 -> unconditional statement
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114 -> conditional statement
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115
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116 statements
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117 -> statement:x =x;
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118 -> statements:x, statement =x;
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119
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120 skip statement
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121 -> skip unconditional statement
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122 -> skip conditional statement
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123
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124 /*
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125 An unconditional statement is any statement that does not involve
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126 an if statement
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127 */
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128
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129 unconditional statement
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130 -> expression:x, ';'
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131 -> ';'
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132 -> '{', '}'
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133 -> '{', statements:s, '}'
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134 -> gather unconditional while, while loop, false condition, skip statement
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135
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136 gather unconditional while
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137 -> "while", balanced parens, skip unconditional statement
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138
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139 while loop
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140 ->
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141 -> while loop, true condition, statement
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142
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143 skip unconditional statement
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144 -> statement text?, ';'
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145 -> balanced braces
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146 -> "while", balanced parens, skip unconditional statement
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147
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148 /*
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149 Any statement with an if in it is a conditional statement
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150 */
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151
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152 conditional statement
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153 -> gather conditional while, while loop, false condition, skip statement
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154 -> true if clause:x, statement
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155 -> false if clause:x, skip statement
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156 -> true if clause:x, unconditional statement:s1, "else", skip statement:s2
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157 -> false if clause:x, skip unconditional statement:s1, "else", statement:s2
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158
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159 gather conditional while
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160 -> "while", balanced parens, skip conditional statement
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161
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162 skip conditional statement
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163 -> "if", balanced parens, skip statement
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164 -> "if", balanced parens, skip unconditional statement, "else", skip statement
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165 -> "while", balanced parens, skip conditional statement
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166
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167 false if clause, true if clause
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168 -> "if", '(', expression:x, ')' ={if (x) CHANGE_REDUCTION(true_if_clause);}
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169
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170 expression
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171 -> conditional expression
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172 -> name:k, '=', expression:x =vm->code(STORE, k), x;
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173 -> name:k, "+=", expression:x =vm->code(ADDM,k), x;
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174 -> name:k, "-=", expression:x =vm->code(SUBM,k), x;
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175 -> name:k, "*=", expression:x =vm->code(MULM,k), x;
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176 -> name:k, "/=", expression:x =vm->code(DIVM,k), x;
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177
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178 conditional expression
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179 -> logical or expression
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180 -> logical or expression:c, '?',
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181 expression:x, ':', conditional expression:y =vm->codeIfElse(c,x,y);
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182
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183 logical or expression
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184 -> logical and expression
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185 -> logical or expression:x, "||",
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186 logical and expression:y =vm->insertCode(OR, vm->wx - y, y), x;
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187
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188 logical and expression
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189 -> equality expression
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190 -> logical and expression:x, "&&",
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191 equality expression:y =vm->insertCode(AND, vm->wx - y, y), x;
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192
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193 equality expression
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194 -> relational expression
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195 -> equality expression:x, "==", relational expression:y =vm->code(EQ), x;
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196 -> equality expression:x, "!=", relational expression:y =vm->code(NE), x;
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197
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198 relational expression
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199 -> additive expression
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200 -> relational expression:x, '<', additive expression:y =vm->code(LT), x;
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201 -> relational expression:x, "<=", additive expression:y =vm->code(LE), x;
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202 -> relational expression:x, '>', additive expression:y =vm->code(GT), x;
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203 -> relational expression:x, ">=", additive expression:y =vm->code(GE), x;
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204
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205 additive expression
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206 -> multiplicative expression
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207 -> additive expression:x, '+',
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208 multiplicative expression:y =vm->code(ADD), x;
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209 -> additive expression:x, '-',
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210 multiplicative expression:y =vm->code(SUB), x;
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211
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212 multiplicative expression
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213 -> factor
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214 -> multiplicative expression:x, '*', factor: y =vm->code(MUL), x;
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215 -> multiplicative expression:x, '/', factor:y =vm->code(DIV), x;
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216
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217 factor
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218 -> primary
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219 -> primary:x, "**", factor:y =vm->code(POW), x;
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220
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221 primary
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222 -> real:x =vm->code(PUSHI, x);
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223 -> name:k =vm->code(PUSH, k);
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224 -> "log", '(', expression:x, ')' =vm->code(LOG), x;
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225 -> "exp", '(', expression:x, ')' =vm->code(EXP), x;
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226 -> '(', expression:x, ')' =x;
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227 -> '-', primary:x =vm->code(NEG), x;
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228 -> '+', primary:x =x;
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229 -> '!', primary:x =vm->code(NOT), x;
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230
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231 // -- LEXICAL UNITS ------------------------------------------------
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232 digit = '0-9'
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233 eof = 0
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234 letter = 'a-z' + 'A-Z' + '_'
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235
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236 (void) white space
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237 -> blank
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238 -> "/*", ~eof?..., "*/" // C style comment
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239 -> "//", ~(eof+'\n')?..., '\n' // C++ style comment
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240
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241 (double) real
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242 -> simple real
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243 -> simple real:x, 'e'+'E', '+'?,exponent:e =x*pow(10,e);
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244 -> simple real:x, 'e'+'E', '-',exponent:e =x*pow(10,-e);
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245
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246 (double) simple real
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247 -> integer part:i, '.', fraction part:f = i+f;
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248 -> integer part, '.'?
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249 -> '.', fraction part:f = f;
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250
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251 (double) integer part
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252 -> digit:d = d-'0';
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253 -> integer part:x, digit:d = 10*x + d-'0';
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254
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255 (double) fraction part
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256 -> digit:d =(d-'0')/10.;
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257 -> digit:d, fraction part:f =(d-'0' + f)/10.;
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258
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259 (int) exponent
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260 -> digit:d = d-'0';
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261 -> exponent:x, digit:d = 10*x + d-'0';
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262
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263 (int) name
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264 -> name string:k =locateVariable(k);
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265
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266 (int) name string
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267 -> letter: c =pushChar(c), 1;
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268 -> name string:k, letter+digit: c =pushChar(c), k+1;
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269
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270 { // begin embedded C
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271
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272
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273 int compileStatements(VirtualMachine *v, char *text) {
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274 vm = v;
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275 resetCharStack();
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276 vmCompile_pcb.pointer = (unsigned char *) text;
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277 vmCompile();
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278 return vmCompile_pcb.exit_flag != AG_SUCCESS_CODE;
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279 }
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280 } // end of embedded C
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281 /********************* End of VM.SYN ************************/