Mercurial > ~dholland > hg > ag > index.cgi
view examples/dsl/edit.h @ 6:607e3be6bad8
Adjust to the moving target called the C++ standard.
Apparently nowadays it's not allowed to define an explicit copy
constructor but not an assignment operator. Consequently, defining the
explicit copy constructor in terms of the implicit/automatic
assignment operator for general convenience no longer works.
Add assignment operators.
Caution: not tested with the IBM compiler, but there's no particular
reason it shouldn't work.
author | David A. Holland |
---|---|
date | Mon, 30 May 2022 23:46:22 -0400 |
parents | 13d2b8934445 |
children |
line wrap: on
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/***** AnaGram Programming Examples A Dos Script Language Line Edit Class The Edit Class is completely defined in this file. There is no supporting CPP file. Copyright 1993 Parsifal Software. All Rights Reserved. This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution. *****/ #ifndef EDIT_H #define EDIT_H #include <string.h> #include "charsink.h" #include "util.h" #include "screen.h" class line_edit_buffer { char *text; // text of line being edited int x; // position of cursor in line int length; // length of line int buf_size; // does not include final zero public: int changes; // if non-zero, line changed // Constructors line_edit_buffer(int n) { // Init with no initial string buf_size = n; text = new char[buf_size + 1]; memset(text,0, buf_size + 1); x = length = changes = 0; } line_edit_buffer(char *s, int n) { // Init with initial string if (s != NULL) { length = strlen(s); if (length > n) n = length; // Make buf at least as long } else length = 0; buf_size = n; text = new char[buf_size + 1]; memset(text,0, buf_size + 1); if (s != NULL) strcpy(text, s); x = changes = 0; } // Destructor ~line_edit_buffer() { delete [] text; } // Insert char in buffer line_edit_buffer &operator << (const int c) { if (length >= buf_size) return *this; if (length < x) { memset(&text[length], ' ', x - length); length = x; text[length] = 0; } memmove(&text[x+1], &text[x], length++ - x); text[x++] = (char )c; changes++; return *this; } // Increment cursor position line_edit_buffer &operator ++() { if (x < buf_size) x++; return *this; } // Move to end of line friend line_edit_buffer &end(line_edit_buffer &b) { b.x = b.length; return b; } line_edit_buffer &operator --() { if (x) x--; return *this; } // Move to beginning of line friend line_edit_buffer &home(line_edit_buffer &b) { b.x = 0; return b; } // Delete a character line_edit_buffer &operator ~() { if (x >= length) return *this; memmove(&text[x], &text[x+1], --length - x); text[length] = 0; changes++; return *this; } operator char *() { return text; } int index() { // return index in line return x; } // Display edit buffer in a a screen rectangle friend screen_rect &operator << ( screen_rect &r , const line_edit_buffer &b ) { int offset = b.x - r.size.x + 1; if (offset < 0) offset = 0; r.set_cursor(b.x - offset) << (b.text + offset); return r; } }; #endif