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annotate examples/dsl/symbol.h @ 2:4b08ee1ecb99

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Adjust install notes to clarify that Wine applies only to the Windows build. (Thanks to Perry Metzger for test-driving.)
author David A. Holland
date Sun, 26 Apr 2009 17:58:26 -0400
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1 /*****
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2
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3 AnaGram Programming Examples
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4
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5 A Dos Script Language
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6 Symbol Table Declarations
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7
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8 Copyright 1993 Parsifal Software. All Rights Reserved.
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9
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10 This software is provided 'as-is', without any express or implied
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11 warranty. In no event will the authors be held liable for any damages
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12 arising from the use of this software.
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13
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14 Permission is granted to anyone to use this software for any purpose,
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15 including commercial applications, and to alter it and redistribute it
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16 freely, subject to the following restrictions:
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17
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18 1. The origin of this software must not be misrepresented; you must not
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19 claim that you wrote the original software. If you use this software
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20 in a product, an acknowledgment in the product documentation would be
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21 appreciated but is not required.
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22 2. Altered source versions must be plainly marked as such, and must not be
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23 misrepresented as being the original software.
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24 3. This notice may not be removed or altered from any source distribution.
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25
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26 *****/
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27
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28 #ifndef SYMBOL_H
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29 #define SYMBOL_H
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30
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31 #include "array.h"
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32 #include "charsink.h"
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33 #include "strdict.h"
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34
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35 struct action_pointer {
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36 unsigned char *pointer;
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37 int line, column;
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38 };
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39
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40 enum symbol_type {
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41 undefined_type,
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42 dos_type,
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43 action_type,
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44 value_type,
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45 internal_type,
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46 integer_type,
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47 string_type,
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48 formula_type,
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49 built_in_function_type
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50 };
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51
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52 struct action_descriptor {
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53 int n_args;
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54 unsigned *args;
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55 action_pointer ap;
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56 };
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57
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58 struct symbol_table_entry {
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59 symbol_type type;
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60 union {
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61 char *text;
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62 int (*proc)(int, char *[]);
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63 long (*func)(void);
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64 action_descriptor *action;
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65 long integer;
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66 } data;
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67 };
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68
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69 struct internal_commands_descriptor {
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70 const char *name;
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71 int (*proc)(int n_args, char *args[]);
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72 };
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73
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74 struct built_ins_descriptor {
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75 const char *name;
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76 long (*proc) (void);
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77 };
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78
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79 extern string_accumulator sa;
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80 extern string_dictionary sd;
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81 extern array<symbol_table_entry> st;
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82
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83 void define_action(int n);
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84 void define_integer(const char *name, long value);
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85 void define_string(void);
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86 void expand_formula(const int *s);
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87 void init_dos_internals(void);
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88 void release(action_descriptor *d);
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89 void release(symbol_table_entry &s);
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90 void set_arg(int, char *);
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91
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92 #endif