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annotate examples/mpp/token.cpp @ 21:1c9dac05d040

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Add lint-style FALLTHROUGH annotations to fallthrough cases. (in the parse engine and thus the output code) Document this, because the old output causes warnings with gcc10.
author David A. Holland
date Mon, 13 Jun 2022 00:04:38 -0400
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1 /*
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2 * AnaGram, a System for Syntax Directed Programming
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3 * C Macro preprocessor
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4 * Token handling module
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5 *
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6 * Copyright 1993 Parsifal Software. All Rights Reserved.
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7 *
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8 * This software is provided 'as-is', without any express or implied
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9 * warranty. In no event will the authors be held liable for any damages
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10 * arising from the use of this software.
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11 *
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12 * Permission is granted to anyone to use this software for any purpose,
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13 * including commercial applications, and to alter it and redistribute it
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14 * freely, subject to the following restrictions:
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15 *
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16 * 1. The origin of this software must not be misrepresented; you must not
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17 * claim that you wrote the original software. If you use this software
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18 * in a product, an acknowledgment in the product documentation would be
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19 * appreciated but is not required.
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20 * 2. Altered source versions must be plainly marked as such, and must not be
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21 * misrepresented as being the original software.
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22 * 3. This notice may not be removed or altered from any source distribution.
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23 */
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24
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25 #include "token.h"
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26
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27
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28 // Constructor for token_accumulator
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29
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30 token_accumulator::token_accumulator(int nc, int nx) {
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31 cs = new token[nc]; // token storage
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32 xs = new unsigned[nx]; // index storage (for levels)
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33 csx = 0; // next free token
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34 csmax = nc - 1; // leave room for termination eof
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35 xsx = xsmax = nx; // pre-decrement, post-increment
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36 xs[--xsx] = csx; // initial token string
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37 }
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38
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39
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40 // Destructor for token_accumulator
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41
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42 token_accumulator::~token_accumulator() {
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43 delete[] cs;
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44 delete[] xs;
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45 }
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46
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47
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48 // Reset token_accumulator
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49
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50 token_accumulator &reset(token_accumulator &t) {
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51 t.csx = 0;
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52 t.xsx = t.xsmax;
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53 t.xs[--t.xsx] = t.csx;
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54 return t;
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55 }
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56
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57 // Push data on token_accumulator
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58
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59 token_sink &token_accumulator::operator << (token *tp) {
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60 while (tp->id != END_OF_FILE) *this << *tp++;
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61 return *this;
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62 }
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63
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64
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65 // Pop data from token_accumulator
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66
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67 token_accumulator &token_accumulator::operator >> (token &c) {
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68 assert(csx > xs[xsx]); // a token to pop
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69 c = cs[--csx]; // pop token
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70 return *this;
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71 }
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72
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73
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74 // Access data in token_accumulator
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75 /*
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76 token &token_accumulator::operator [](unsigned i) {
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77 assert(i < csx - xs[xsx]); // index in bounds
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78 return cs[csx - i - 1]; // identify token
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79 }
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80 */
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81
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82 // Concatenate token strings in token_accumulator
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83
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84 token_accumulator &concat(token_accumulator &s) {
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85 assert(s.xsx < s.xsmax - 1); // at least two strings
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86 s.xsx++;
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87 return s;
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88 }
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89
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90
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91 // Make permanent copy of token string
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92
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93 token *copy(token_accumulator &s) {
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94 int n = s.csx - s.xs[s.xsx] + 1;
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95 token *c = new token[n];
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96 token null;
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97 null.id = END_OF_FILE;
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98 null.handle = 0;
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99 s.cs[s.csx] = null;
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100 memcpy(c, (token *) s, n*sizeof(token));
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101 return c;
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102 }
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103
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104
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105 // Send token string to token translator
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106
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107 token_sink &token_translator::operator << (token *tp) {
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108 while (tp->id != END_OF_FILE) *this << *tp++;
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109 return *this;
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110 }