mirror of https://github.com/OpenRCT2/OpenRCT2.git
131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
#pragma region Copyright (c) 2014-2017 OpenRCT2 Developers
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/*****************************************************************************
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* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
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*
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* OpenRCT2 is the work of many authors, a full list can be found in contributors.md
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* For more information, visit https://github.com/OpenRCT2/OpenRCT2
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*
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* OpenRCT2 is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* A full copy of the GNU General Public License can be found in licence.txt
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*****************************************************************************/
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#pragma endregion
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#include "../localisation/Localisation.h"
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#include "textinputbuffer.h"
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void textinputbuffer_init(textinputbuffer * tib, utf8 * buffer, size_t size)
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{
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assert(buffer != NULL);
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assert(size > 0);
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tib->buffer = buffer;
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tib->max_size = size - 1;
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tib->current_size = strlen(buffer);
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tib->selection_offset = tib->current_size;
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tib->selection_size = 0;
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textinputbuffer_recalculate_length(tib);
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}
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void textinputbuffer_clear(textinputbuffer * tib)
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{
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tib->buffer[0] = 0;
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tib->current_size = 0;
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tib->length = 0;
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tib->selection_offset = 0;
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tib->selection_size = 0;
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}
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void textinputbuffer_remove_selected(textinputbuffer * tib)
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{
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utf8 * targetShiftPtr = tib->buffer + tib->selection_offset;
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utf8 * sourceShiftPtr = targetShiftPtr + tib->selection_size;
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size_t shiftSize = tib->current_size - tib->selection_offset - tib->selection_size + 1;
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memmove(targetShiftPtr, sourceShiftPtr, shiftSize);
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tib->selection_size = 0;
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textinputbuffer_recalculate_length(tib);
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}
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void textinputbuffer_insert_codepoint(textinputbuffer * tib, uint32 codepoint)
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{
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size_t codepointLength = utf8_get_codepoint_length(codepoint);
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size_t remainingSize = tib->max_size - tib->current_size;
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if (codepointLength <= remainingSize) {
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utf8 * insertPtr = tib->buffer + tib->selection_offset;
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if (tib->selection_offset < tib->current_size) {
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// Shift bytes (including null terminator) right to make room for new codepoint
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utf8 * targetShiftPtr = insertPtr + codepointLength;
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size_t shiftSize = tib->current_size - tib->selection_offset + 1;
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memmove(targetShiftPtr, insertPtr, shiftSize);
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} else {
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// Character is appended onto the end, so set byte after it to null terminator
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tib->buffer[tib->current_size + codepointLength] = 0;
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}
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utf8_write_codepoint(insertPtr, codepoint);
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tib->selection_offset += codepointLength;
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tib->current_size += codepointLength;
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tib->length++;
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}
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}
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void textinputbuffer_insert(textinputbuffer * tib, const utf8 * source)
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{
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const utf8 *ch = source;
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uint32 codepoint;
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while ((codepoint = utf8_get_next(ch, &ch)) != 0) {
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textinputbuffer_insert_codepoint(tib, codepoint);
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}
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}
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void textinputbuffer_cursor_left(textinputbuffer * tib)
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{
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size_t selectionOffset = tib->selection_offset;
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if (selectionOffset > 0) {
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const utf8 * ch = tib->buffer + selectionOffset;
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do {
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ch--;
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selectionOffset--;
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} while (!utf8_is_codepoint_start(ch) && selectionOffset > 0);
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tib->selection_offset = selectionOffset;
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}
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}
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void textinputbuffer_cursor_right(textinputbuffer * tib)
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{
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size_t selectionOffset = tib->selection_offset;
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size_t selectionMaxOffset = tib->current_size;
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if (selectionOffset < selectionMaxOffset) {
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const utf8 * ch = tib->buffer + selectionOffset;
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do {
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ch++;
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selectionOffset++;
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} while (!utf8_is_codepoint_start(ch) && selectionOffset < selectionMaxOffset);
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tib->selection_size = tib->selection_size - (selectionOffset - tib->selection_offset);
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tib->selection_offset = selectionOffset;
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}
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}
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void textinputbuffer_cursor_home(textinputbuffer * tib)
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{
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tib->selection_offset = 0;
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}
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void textinputbuffer_cursor_end(textinputbuffer * tib)
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{
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tib->selection_offset = tib->current_size;
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}
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void textinputbuffer_recalculate_length(textinputbuffer * tib)
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{
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tib->current_size = strlen(tib->buffer);
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tib->length = utf8_length(tib->buffer);
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}
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