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annotate examples/dsl/edit.h @ 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
parents 13d2b8934445
children
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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 Line Edit Class
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7 The Edit Class is completely defined in this file.
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8 There is no supporting CPP file.
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9
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10 Copyright 1993 Parsifal Software. All Rights Reserved.
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11
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12 This software is provided 'as-is', without any express or implied
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13 warranty. In no event will the authors be held liable for any damages
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14 arising from the use of this software.
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15
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16 Permission is granted to anyone to use this software for any purpose,
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17 including commercial applications, and to alter it and redistribute it
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18 freely, subject to the following restrictions:
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19
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20 1. The origin of this software must not be misrepresented; you must not
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21 claim that you wrote the original software. If you use this software
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22 in a product, an acknowledgment in the product documentation would be
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23 appreciated but is not required.
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24 2. Altered source versions must be plainly marked as such, and must not be
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25 misrepresented as being the original software.
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26 3. This notice may not be removed or altered from any source distribution.
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27
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28 *****/
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29
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30
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31 #ifndef EDIT_H
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32 #define EDIT_H
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33
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34 #include <string.h>
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35 #include "charsink.h"
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36 #include "util.h"
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37 #include "screen.h"
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38
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39 class line_edit_buffer {
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40 char *text; // text of line being edited
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41 int x; // position of cursor in line
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42 int length; // length of line
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43 int buf_size; // does not include final zero
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44 public:
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45 int changes; // if non-zero, line changed
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46
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47
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48 // Constructors
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49
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50 line_edit_buffer(int n) { // Init with no initial string
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51 buf_size = n;
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52 text = new char[buf_size + 1];
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53 memset(text,0, buf_size + 1);
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54 x = length = changes = 0;
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55 }
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56
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57 line_edit_buffer(char *s, int n) { // Init with initial string
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58 if (s != NULL) {
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59 length = strlen(s);
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60 if (length > n) n = length; // Make buf at least as long
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61 }
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62 else length = 0;
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63 buf_size = n;
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64 text = new char[buf_size + 1];
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65 memset(text,0, buf_size + 1);
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66 if (s != NULL) strcpy(text, s);
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67 x = changes = 0;
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68 }
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69
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70
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71 // Destructor
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72
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73 ~line_edit_buffer() {
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74 delete [] text;
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75 }
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76
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77
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78 // Insert char in buffer
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79
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80 line_edit_buffer &operator << (const int c) {
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81 if (length >= buf_size) return *this;
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82 if (length < x) {
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83 memset(&text[length], ' ', x - length);
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84 length = x;
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85 text[length] = 0;
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86 }
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87 memmove(&text[x+1], &text[x], length++ - x);
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88 text[x++] = (char )c;
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89 changes++;
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90 return *this;
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91 }
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92
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93
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94 // Increment cursor position
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95
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96 line_edit_buffer &operator ++() {
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97 if (x < buf_size) x++;
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98 return *this;
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99 }
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100
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101
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102 // Move to end of line
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103
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104 friend line_edit_buffer &end(line_edit_buffer &b) {
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105 b.x = b.length;
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106 return b;
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107 }
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108 line_edit_buffer &operator --() {
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109 if (x) x--;
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110 return *this;
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111 }
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112
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113 // Move to beginning of line
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114
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115 friend line_edit_buffer &home(line_edit_buffer &b) {
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116 b.x = 0;
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117 return b;
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118 }
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119
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120 // Delete a character
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121
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122 line_edit_buffer &operator ~() {
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123 if (x >= length) return *this;
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124 memmove(&text[x], &text[x+1], --length - x);
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125 text[length] = 0;
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126 changes++;
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127 return *this;
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128 }
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129
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130 operator char *() {
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131 return text;
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132 }
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133
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134 int index() { // return index in line
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135 return x;
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136 }
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137
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138
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139 // Display edit buffer in a a screen rectangle
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140
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141 friend screen_rect &operator << ( screen_rect &r
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142 , const line_edit_buffer &b
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143 ) {
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144 int offset = b.x - r.size.x + 1;
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145 if (offset < 0) offset = 0;
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146
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147 r.set_cursor(b.x - offset) << (b.text + offset);
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148 return r;
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149 }
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150 };
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151
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152 #endif