annotate tests/agcl/oldagsrc/mas.syn @ 23:cac4c76600eb

Update lint ok file for recent change.
author David A. Holland
date Mon, 13 Jun 2022 00:17:10 -0400
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1 {
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2 /*
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3 AnaGram, a System for Syntax Directed Programming
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4 C Macro preprocessor
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5
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6 Copyright (c) 1993, Parsifal Software.
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7 All Rights Reserved.
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8
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9 Macro argument substitution module
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10 */
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11
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12 #include "mpp.h"
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13
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14 }
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15
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16
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17 // Configuration Section
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18
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19 [
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20 ~allow macros
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21 line numbers
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22 pointer input
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23 pointer type = token *
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24 input values
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25 ~error frame
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26 error trace
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27 ~lines and columns
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28 ~backtrack
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29 ~test range
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30 default input type = token
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31 ~declare pcb
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32 subgrammar {
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33 parse unit
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34 }
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35 enum {
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36 eof =0,
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37 SPACE =' ',
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38 ANDAND ='A', // "&&"
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39 ANDassign, // "&="
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40 ARROW, // "->"
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41 CONCAT, // "##"
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42 DECR, // "--"
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43 DIVassign, // "/="
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44 ELLIPSIS, // "..."
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45 EQ, // "=="
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46 ERassign, // "^="
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47 GE, // ">="
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48 ICR, // "++"
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49 LE, // "<="
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50 LS, // "<<"
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51 LSassign, // "<<="
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52 MODassign, // "%="
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53 MINUSassign, // "-="
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54 MULTassign, // "*="
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55 NE, // "!="
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56 ORassign, // "|="
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57 OROR, // "||"
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58 PLUSassign, // "+="
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59 RS, // ">>"
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60 RSassign, // ">>="
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61 CHARACTERconstant, // character constant
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62 STRINGliteral, // character string
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63 HEXconstant =129,
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64 OCTconstant,
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65 DECconstant,
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66 FLOATconstant, // real
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67 NAME,
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68 AUTO, // "auto"
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69 BREAK, // "break"
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70 CASE, // "case"
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71 CHAR, // "char"
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72 CONSTANT, // "const"
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73 CONTINUE, // "continue"
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74 DEFAULT, // "default"
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75 DO, // "do"
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76 DOUBLE, // "double"
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77 ELSE, // "else"
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78 ENUM, // "enum"
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79 EXTERN, // "extern"
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80 FLOAT, // "float"
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81 FOR, // "for"
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82 GOTO, // "goto"
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83 IF, // "if"
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84 INT, // "int"
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85 LONG, // "long"
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86 REGISTER, // "register"
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87 RETURN, // "return"
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88 SHORT, // "short"
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89 SIGNED, // "signed"
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90 SIZEOF, // "sizeof"
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91 STATIC, // "static"
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92 STRUCT, // "struct"
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93 SWITCH, // "switch"
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94 TYPEDEF, // "typedef"
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95 UNION, // "union"
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96 UNSIGNED, // "unsigned"
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97 VOIDkey, // "void"
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98 VOLATILE, // "volatile"
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99 WHILE, // "while"
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100 UNRECOGNIZED,
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101 }
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102 parser file name = "#.cpp"
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103 ]
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104
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105 grammar
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106 ->space, parse unit?..., eof
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107
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108
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109 // Accumulate optional space
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110
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111 space
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112 -> =reset(space_stack);
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113 -> space, ' ':s ={if (args_only) space_stack << s;}
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114
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115
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116 // Basic parse units
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117
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118 parse unit
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119 -> parameter expansion
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120 -> simple parse unit, space =ta << space_stack;
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121 -> concatenation, space =ta << space_stack;
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122 -> macro:t, space =ta << t << space_stack;
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123
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124 simple parse unit
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125 -> ~eof - NAME - CONCAT - '#'- ' ':t =ta << t;
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126 -> '#', parameter name:n =ta << make_string(n.handle);
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127 -> variable:t =ta << t;
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128 -> simple macro:t =expand_macro(t,0), concat(ta);
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129 -> macro:t, space, '(', macro arg list:n, ')' =expand_macro(t,n), concat(ta);
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130 -> defined, macro name:n =ta << defined(n.handle);
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131
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132 (token) macro name
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133 -> space, NAME:n =n;
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134 -> space, '(', space, NAME:n, space, ')' =n;
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135
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136 (token) variable, parameter name, simple macro, macro, defined
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137 -> NAME:n =id_macro(n);
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138
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139 parameter expansion
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140 -> parameter name:name, space =expand_arg(name.handle), ta << space_stack;
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141
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142
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143 // Implementation of "##" operator
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144
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145 concatenation
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146 -> left side, space,
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147 parameter name:name =ta << args[name.handle], concatenate();
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148 -> left side, space, right side =concatenate();
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149
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150 left side
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151 -> parameter name:n, space, CONCAT =ta << args[n.handle], ++ta;
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152 -> simple parse unit, space, CONCAT =++ta;
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153 -> macro:t, space, CONCAT =ta << t, ++ta;
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154 -> concatenation, space, CONCAT =++ta;
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155
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156 right side
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157 -> ~eof - NAME - CONCAT - '#'- ' ':t =ta << t;
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158 -> '#', parameter name:n =ta << make_string(n.handle);
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159 -> not parameter:t =ta << t;
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160
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161 (token) not parameter
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162 -> variable
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163 -> simple macro
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164 -> macro
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165 -> defined
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166
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167
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168 // Gather Macro Arguments
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169
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170 (int) macro arg list
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171 -> space = 0;
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172 -> space, arg elements = 1;
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173 -> macro arg list:n, ',', space, arg elements =n+1;
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174
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175 initial arg element
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176 -> ~eof - ',' - '(' - ')' - SPACE:t =++ta << t;
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177 -> nested elements, ')':t =ta << t;
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178
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179 arg element
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180 -> ~eof - ',' - '(' - ')':t =ta << t;
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181 -> nested elements, ')':t =concat(ta) << t;
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182
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183 arg elements
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184 -> initial arg element
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185 -> arg elements, arg element
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186
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187 nested elements
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188 -> '(':t =++ta << t;
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189 -> nested elements, arg element
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190 -> nested elements, ',':t =ta << t;
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191
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192
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193 { // Embedded C
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194 #include "array.h" // AnaGram\CLASSLIB\INCLUDE\array.h
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195 #include "stack.h" // AnaGram\CLASSLIB\INCLUDE\stack.h
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196
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197
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198 // Macro Definitions
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199
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200 #define INPUT_CODE(T) (T).id
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201 #define PCB (*mas_pcb)
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202 #define SYNTAX_ERROR syntax_error(PCB.error_message);
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203
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204
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205 // Static variables
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206
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207 static stack<unsigned> active_macros(200,20);
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208 static token **args;
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209 static int args_only = 0;
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210 static mas_pcb_type *mas_pcb;
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211 static int n_concats = 0;
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212 static int n_args;
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213 static unsigned *params;
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214 static token_accumulator space_stack(100);
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215
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216
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217 /*
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218
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219 expand_text() is a shell procedure which calls the mas parser a
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220 number of times. It is used to expand arguments before substituting
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221 them into a macro, and to expand the body of a macro. Notice that
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222 expand_text() is recursive, since macros encountered during the an
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223 expansion process may themselves need to be expanded.
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224
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225 expand_text() takes three explicit arguments:
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226 token *text:
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227 points to a string of tokens, terminated by an eof token.
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228
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229 int n:
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230 specifies the number of arguments. Defaults to 0. The arguments
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231 themselves are token strings on the token accumulator stack.
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232 expand_text() makes copies of them and stores pointers to them in
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233 the args array.
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234
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235 unsigned *p:
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236 An array of n dictionary indices which gives the names of the
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237 parameters for which the arguments are to be substituted. p
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238 defaults to NULL.
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239
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240 global switches
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241 Two global switches affect the expansion of text: if_clause and
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242 args_only. Setting if_clause affects the treatment of the token
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243 "defined". Setting args_only causes only macro parameters to be
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244 expanded.
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245
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246 */
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247
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248 void expand_text(token *text, int n, unsigned *p) {
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249 mas_pcb_type pcb;
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250
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251 // Save old status
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252 mas_pcb_type *save_pcb = mas_pcb;
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253 int save_n_args = n_args;
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254 token **save_args = args;
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255 unsigned *save_params = params;
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256 int save_switch = args_only;
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257
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258 // pop args from accumlator stack and expand them
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259 args_only = 0;
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260 token **new_args;
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261 int k = n;
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262 if (n) {
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263 new_args = new token*[n];
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264 args_only = 1;
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265 while (k--) {
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266 token t;
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267 while (ta[0].id == SPACE) ta >> t; //trim space on right
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268 array<token> arg_tokens(ta, size(ta) + 1);
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269 token *tp = arg_tokens;
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270 while (tp->id == SPACE) tp++; //trim space on left
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271 --ta;
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272 mas_pcb = &pcb;
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273 pcb.pointer = tp;
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274 ++ta;
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275 mas();
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276 new_args[k] = copy(ta);
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277 --ta;
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278 }
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279 args_only = 0;
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280 }
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281 else new_args = NULL;
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282
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283 // Expand text
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284 args = new_args;
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285 n_args = n;
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286 params = p;
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287 pcb.pointer = text;
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288 mas_pcb = &pcb;
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289 ++ta;
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290 ++active_macros;
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291 n_concats = 0;
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292 mas();
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293
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294 // If any new tokens were created by concatenation, rescan
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295 while (n_concats) {
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296 array<token> expansion(ta,size(ta) + 1);
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297 --ta;
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298 pcb.pointer = expansion;
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299 ++ta;
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300 n_concats = 0;
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301 n = size(active_macros);
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302 while (n--) macro[active_macros[n]].busy_flag = 1;
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303 mas();
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304 }
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305 n = size(active_macros);
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306 while (n--) macro[active_macros[n]].busy_flag = 0;
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307 --active_macros;
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308
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309 // Discard argument strings
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310
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311 n = n_args;
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312 while (n--) delete [] args[n];
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313 if (n_args) delete [] args;
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314
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315 // Restore old status
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316
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317 args_only = save_switch;
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318 args = save_args;
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319 n_args = save_n_args;
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320 params = save_params;
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321 mas_pcb = save_pcb;
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322 }
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323
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324 /*
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325
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326 expand_macro() is a shell procedure which sets up a call to
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327 expand_text for a specific macro.
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328
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329 */
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330
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331 void expand_macro(token t, unsigned n_args) {
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332 unsigned id = macro_id[t.handle];
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333 token *body = macro[id].body;
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334 assert(n_args == macro[id].n_args);
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335 if (body == NULL) {
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336 while (n_args--) --ta;
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337 ++ta;
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338 return;
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339 }
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340 expand_text(body,n_args,macro[id].arg_names);
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341 }
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342
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343 /*
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344
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345 expand_arg() is another shell procedure for expand_text() which does
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346 a complete expansion of a single macro argument.
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347
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348 */
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349
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350 static void expand_arg(unsigned n) {
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351 expand_text(args[n]);
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352 concat(ta);
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353 }
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354
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355 /*
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356
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357 id_macro() is very nearly the same as id_macro() in TS.SYN. The
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358 primary difference is that this one deals in tokens, the other in
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359 character strings.
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360
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361 */
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362
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363 static token id_macro(token t) {
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364 unsigned n = n_args;
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365 unsigned id;
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366
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367 while (n--) if (t.handle == params[n]) {
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368 CHANGE_REDUCTION(parameter_name);
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369 t.handle = n;
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370 return t;
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371 }
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372 if (args_only) return t;
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373 if (if_clause && t.handle == defined_value) {
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374 CHANGE_REDUCTION(defined);
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375 return t;
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376 }
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377 id = macro_id[t.handle];
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378 if (id == 0) return t;
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379 if (macro[id].busy_flag) return t;
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380 active_macros << id;
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381 if (macro[id].parens) CHANGE_REDUCTION(macro);
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382 else CHANGE_REDUCTION(simple_macro);
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383 return t;
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384 }
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385
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386 /*
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387
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388 defined() is very nearly the same as defined() in TS.SYN. The primary
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389 difference is that this one deals in tokens, the other in character
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390 strings.
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391
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392 */
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393
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394 static token defined(unsigned handle) {
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395 token t;
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396 t.id = DECconstant;
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397 t.handle = macro_id[handle] ? one_value : zero_value;
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398 return t;
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399 }
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400
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401 /*
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402
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403 concatenate() implements the splicing together of two tokens by the
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404 "##" operator in a macro definition. Because of the way the grammar
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405 has been written, spaces have already been trimmed on both sides of the
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406 ## by the parser.
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407
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408 If there are actually two tokens to concatenate, the last token on
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409 the left is popped off, its string value is obtained from the token
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410 dictionary and pushed onto the string accumulator, ditto for the
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411 first token on the right. The string is then identified and the token
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412 is classified. If the new token is the name of a macro, a new scan
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413 will be required to expand it.
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414
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415 */
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416
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417 static void concatenate(void) {
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418 array<token> right_arg(ta, size(ta) + 1);
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419 token t;
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420 token *tp = right_arg;
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421
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422 --ta; // discard right argument from stack
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423
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424 if (size(ta) && tp->id != END_OF_FILE) {
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425 ta >> t; // pop left token
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426 ++sa << td[t.handle] << td[tp->handle]; // left string + right string
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427 t.handle = td << sa; // identify string
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428 t.id = classify_token(sa); // classify token
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429 --sa; // discard string
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430 ++tp; // discard old token on right
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431 if (macro_id[t.handle]) n_concats++; // if macro, signal rescan
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432 ta << t; // output new token
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433 }
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434 ta << tp; // remainder of right side
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435 }
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436
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437 /*
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438
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439 make_string() implements the '#' operator in macro expansions, that
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440 is, it turns its operand into a string constant. To do this it must
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441 provide "" marks and must quote any embedded " or \ characters with
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442 the \ character.
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443
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444 */
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445
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446 static token make_string(unsigned n) {
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447 token *tp;
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448 token t;
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449
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450 tp = args[n];
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451 ++sa << '"';
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452 while (tp->id != END_OF_FILE) {
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453 char *p = td[tp->handle];
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454 char c;
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455 while ((c = *p++) != 0) {
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456 if (c == '"' || c == '\\') sa << '\\';
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457 sa << c;
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458 }
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459 tp++;
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460 }
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461 sa << '"';
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462 t.id = STRINGliteral;
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463 t.handle = td << sa;
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464 --sa;
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465 return t;
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466 }
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467
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468 } // End of Embedded C