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annotate examples/dsl/edit.h @ 18:562c313f14f4

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some minor updates for 2022
author David A. Holland
date Tue, 31 May 2022 02:03:50 -0400
parents 13d2b8934445
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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