mirror of
https://github.com/RGBCube/serenity
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43199e5613
This commit adds support for inserting in a "verbatim" mode where a single uninterpreted key is appended to the buffer. As this allows the user to input control characters, all control characters except \n (^M) are rendered in their caret form, with reverse video (SGR 7) applied to it. To not break cursor movement, the concept of "masked" characters is introduced to the StringMetrics interface, which can be mostly ignored by the rest of the system. It should be noted that unlike some other line editing libraries, LibLine does _not_ render a hard tab as a tab, but rather as '^I', which greatly simplifies cursor handling.
72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
/*
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* Copyright (c) 2020-2021, The SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Types.h>
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#include <AK/Vector.h>
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namespace Line {
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struct StringMetrics {
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struct MaskedChar {
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size_t position { 0 };
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size_t original_length { 0 };
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size_t masked_length { 0 };
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};
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struct LineMetrics {
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Vector<MaskedChar> masked_chars;
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size_t length { 0 };
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size_t total_length(ssize_t offset = -1) const
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{
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size_t length = this->length;
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for (auto& mask : masked_chars) {
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if (offset < 0 || mask.position <= (size_t)offset) {
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length -= mask.original_length;
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length += mask.masked_length;
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}
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}
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return length;
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}
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};
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Vector<LineMetrics> line_metrics;
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size_t total_length { 0 };
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size_t max_line_length { 0 };
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size_t lines_with_addition(const StringMetrics& offset, size_t column_width) const;
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size_t offset_with_addition(const StringMetrics& offset, size_t column_width) const;
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void reset()
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{
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line_metrics.clear();
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total_length = 0;
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max_line_length = 0;
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line_metrics.append({ {}, 0 });
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}
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};
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}
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