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278 lines
10 KiB
C++
278 lines
10 KiB
C++
/**
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* Copyright (c) 2013, Timothy Stack
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*
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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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* * 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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* * 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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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file ansi_scrubber.cc
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*/
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#include <algorithm>
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#include "ansi_scrubber.hh"
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#include "base/opt_util.hh"
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#include "config.h"
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#include "pcrepp/pcrepp.hh"
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#include "scn/scn.h"
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#include "view_curses.hh"
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static const pcrepp&
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ansi_regex()
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{
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static const pcrepp retval(
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"\x1b\\[([\\d=;\\?]*)([a-zA-Z])|(?:[^\x08]\x08[^\x08])+");
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return retval;
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}
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void
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scrub_ansi_string(std::string& str, string_attrs_t* sa)
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{
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pcre_context_static<60> context;
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const auto& regex = ansi_regex();
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pcre_input pi(str);
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int64_t origin_offset = 0;
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int last_origin_offset_end = 0;
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replace(str.begin(), str.end(), '\0', ' ');
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while (regex.match(context, pi, PCRE_NO_UTF8_CHECK)) {
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auto* caps = context.all();
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const auto sf = pi.get_string_fragment(caps);
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if (sf.length() >= 3 && sf[1] == '\b') {
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ssize_t fill_index = sf.sf_begin;
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ssize_t erased_size = (sf.length() / 3) * 2;
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ssize_t output_size = sf.length() / 3;
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line_range bold_range;
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line_range ul_range;
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if (sa != nullptr) {
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shift_string_attrs(
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*sa, caps->c_begin + sf.length() / 3, -erased_size);
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sa->emplace_back(line_range{last_origin_offset_end,
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caps->c_begin + (int) output_size},
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SA_ORIGIN_OFFSET.value(origin_offset));
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}
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for (ssize_t triple_index = 0; triple_index < output_size;
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triple_index++)
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{
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char lhs = sf[triple_index * 3];
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char rhs = sf[triple_index * 3 + 2];
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if (lhs == '_' || rhs == '_') {
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if (sa != nullptr && bold_range.is_valid()) {
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sa->emplace_back(bold_range,
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VC_STYLE.value(text_attrs{A_BOLD}));
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bold_range.clear();
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}
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if (ul_range.is_valid()) {
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ul_range.lr_end += 1;
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} else {
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ul_range.lr_start = fill_index;
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ul_range.lr_end = fill_index + 1;
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}
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str[fill_index++] = lhs == '_' ? rhs : lhs;
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} else {
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if (sa != nullptr && ul_range.is_valid()) {
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sa->emplace_back(
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ul_range, VC_STYLE.value(text_attrs{A_UNDERLINE}));
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ul_range.clear();
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}
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if (bold_range.is_valid()) {
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bold_range.lr_end += 1;
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} else {
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bold_range.lr_start = fill_index;
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bold_range.lr_end = fill_index + 1;
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}
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str[fill_index++] = rhs;
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}
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}
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if (sa != nullptr && ul_range.is_valid()) {
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sa->emplace_back(ul_range,
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VC_STYLE.value(text_attrs{A_UNDERLINE}));
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ul_range.clear();
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}
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if (sa != nullptr && bold_range.is_valid()) {
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sa->emplace_back(bold_range,
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VC_STYLE.value(text_attrs{A_BOLD}));
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bold_range.clear();
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}
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str.erase(str.begin() + fill_index, str.begin() + caps->c_end);
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last_origin_offset_end = caps->c_begin + output_size;
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origin_offset += erased_size;
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pi.reset(str);
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continue;
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}
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struct line_range lr;
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bool has_attrs = false;
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text_attrs attrs;
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auto role = nonstd::optional<role_t>();
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size_t lpc;
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switch (pi.get_substr_start(&caps[2])[0]) {
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case 'm':
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for (lpc = caps[1].c_begin;
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lpc != std::string::npos && lpc < (size_t) caps[1].c_end;)
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{
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auto ansi_code_res = scn::scan_value<int>(
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scn::string_view{&str[lpc], &str[caps[1].c_end]});
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if (ansi_code_res) {
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auto ansi_code = ansi_code_res.value();
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if (90 <= ansi_code && ansi_code <= 97) {
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ansi_code -= 60;
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attrs.ta_attrs |= A_STANDOUT;
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}
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if (30 <= ansi_code && ansi_code <= 37) {
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attrs.ta_fg_color = ansi_code - 30;
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}
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if (40 <= ansi_code && ansi_code <= 47) {
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attrs.ta_bg_color = ansi_code - 40;
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}
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switch (ansi_code) {
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case 1:
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attrs.ta_attrs |= A_BOLD;
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break;
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case 2:
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attrs.ta_attrs |= A_DIM;
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break;
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case 4:
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attrs.ta_attrs |= A_UNDERLINE;
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break;
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case 7:
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attrs.ta_attrs |= A_REVERSE;
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break;
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}
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}
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lpc = str.find(';', lpc);
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if (lpc != std::string::npos) {
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lpc += 1;
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}
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}
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has_attrs = true;
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break;
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case 'C': {
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auto spaces_res = scn::scan_value<unsigned int>(
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pi.to_string_view(&caps[1]));
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if (spaces_res && spaces_res.value() > 0) {
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str.insert((std::string::size_type) caps[0].c_end,
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spaces_res.value(),
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' ');
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}
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break;
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}
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case 'H': {
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unsigned int row = 0, spaces = 0;
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if (scn::scan(pi.to_string_view(&caps[1]), "{};{}", row, spaces)
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&& spaces > 1)
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{
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int ispaces = spaces - 1;
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if (ispaces > caps[0].c_begin) {
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str.insert((unsigned long) caps[0].c_end,
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ispaces - caps[0].c_begin,
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' ');
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}
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}
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break;
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}
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case 'O': {
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auto role_res
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= scn::scan_value<int>(pi.to_string_view(&caps[1]));
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if (role_res) {
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role_t role_tmp = (role_t) role_res.value();
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if (role_tmp > role_t::VCR_NONE
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&& role_tmp < role_t::VCR__MAX)
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{
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role = role_tmp;
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has_attrs = true;
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}
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}
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break;
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}
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}
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str.erase(str.begin() + caps[0].c_begin, str.begin() + caps[0].c_end);
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if (sa != nullptr) {
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shift_string_attrs(*sa, caps[0].c_begin, -caps[0].length());
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if (has_attrs) {
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for (auto rit = sa->rbegin(); rit != sa->rend(); rit++) {
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if (rit->sa_range.lr_end != -1) {
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continue;
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}
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rit->sa_range.lr_end = caps[0].c_begin;
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}
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lr.lr_start = caps[0].c_begin;
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lr.lr_end = -1;
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if (attrs.ta_attrs || attrs.ta_fg_color || attrs.ta_bg_color) {
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sa->emplace_back(lr, VC_STYLE.value(attrs));
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}
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role | [&lr, &sa](role_t r) {
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sa->emplace_back(lr, VC_ROLE.value(r));
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};
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}
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sa->emplace_back(line_range{last_origin_offset_end, caps->c_begin},
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SA_ORIGIN_OFFSET.value(origin_offset));
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origin_offset += caps->length();
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}
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pi.reset(str);
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}
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if (sa != nullptr && last_origin_offset_end > 0) {
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sa->emplace_back(line_range{last_origin_offset_end, (int) str.size()},
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SA_ORIGIN_OFFSET.value(origin_offset));
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}
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}
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void
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add_ansi_vars(std::map<std::string, scoped_value_t>& vars)
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{
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vars["ansi_csi"] = ANSI_CSI;
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vars["ansi_norm"] = ANSI_NORM;
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vars["ansi_bold"] = ANSI_BOLD_START;
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vars["ansi_underline"] = ANSI_UNDERLINE_START;
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vars["ansi_black"] = ANSI_COLOR(COLOR_BLACK);
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vars["ansi_red"] = ANSI_COLOR(COLOR_RED);
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vars["ansi_green"] = ANSI_COLOR(COLOR_GREEN);
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vars["ansi_yellow"] = ANSI_COLOR(COLOR_YELLOW);
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vars["ansi_blue"] = ANSI_COLOR(COLOR_BLUE);
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vars["ansi_magenta"] = ANSI_COLOR(COLOR_MAGENTA);
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vars["ansi_cyan"] = ANSI_COLOR(COLOR_CYAN);
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vars["ansi_white"] = ANSI_COLOR(COLOR_WHITE);
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}
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