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168 lines
5.5 KiB
C++
168 lines
5.5 KiB
C++
/**
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* Copyright (c) 2020, 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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#include "highlighter.hh"
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#include "config.h"
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highlighter::highlighter(const highlighter& other)
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{
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this->h_pattern = other.h_pattern;
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this->h_fg = other.h_fg;
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this->h_bg = other.h_bg;
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this->h_role = other.h_role;
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this->h_code = other.h_code;
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pcre_refcount(this->h_code, 1);
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this->study();
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this->h_attrs = other.h_attrs;
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this->h_text_formats = other.h_text_formats;
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this->h_format_name = other.h_format_name;
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this->h_nestable = other.h_nestable;
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}
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highlighter&
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highlighter::operator=(const highlighter& other)
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{
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if (this == &other) {
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return *this;
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}
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if (this->h_code != nullptr && pcre_refcount(this->h_code, -1) == 0) {
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free(this->h_code);
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this->h_code = nullptr;
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}
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free(this->h_code_extra);
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this->h_pattern = other.h_pattern;
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this->h_fg = other.h_fg;
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this->h_bg = other.h_bg;
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this->h_role = other.h_role;
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this->h_code = other.h_code;
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pcre_refcount(this->h_code, 1);
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this->study();
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this->h_format_name = other.h_format_name;
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this->h_attrs = other.h_attrs;
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this->h_text_formats = other.h_text_formats;
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this->h_nestable = other.h_nestable;
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return *this;
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}
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void
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highlighter::study()
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{
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const char* errptr;
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this->h_code_extra = pcre_study(this->h_code, 0, &errptr);
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if (!this->h_code_extra && errptr) {
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log_error("pcre_study error: %s", errptr);
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}
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if (this->h_code_extra != nullptr) {
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pcre_extra* extra = this->h_code_extra;
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extra->flags
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|= (PCRE_EXTRA_MATCH_LIMIT | PCRE_EXTRA_MATCH_LIMIT_RECURSION);
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extra->match_limit = 10000;
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extra->match_limit_recursion = 500;
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}
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}
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void
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highlighter::annotate(attr_line_t& al, int start) const
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{
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auto& vc = view_colors::singleton();
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const auto& str = al.get_string();
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auto& sa = al.get_attrs();
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// The line we pass to pcre_exec will be treated as the start when the
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// carat (^) operator is used.
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const char* line_start = &(str.c_str()[start]);
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size_t re_end;
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if ((str.length() - start) > 8192)
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re_end = 8192;
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else
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re_end = str.length() - start;
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for (int off = 0; off < (int) str.size() - start;) {
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int rc, matches[60];
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rc = pcre_exec(this->h_code,
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this->h_code_extra,
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line_start,
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re_end,
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off,
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0,
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matches,
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60);
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if (rc > 0) {
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struct line_range lr;
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if (rc == 2) {
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lr.lr_start = start + matches[2];
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lr.lr_end = start + matches[3];
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} else {
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lr.lr_start = start + matches[0];
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lr.lr_end = start + matches[1];
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}
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if (lr.lr_end > lr.lr_start
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&& (this->h_nestable
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|| find_string_attr_containing(
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sa, &VC_STYLE, lr)
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== sa.end()))
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{
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if (!this->h_fg.empty()) {
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sa.emplace_back(
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lr,
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VC_FOREGROUND.value(
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vc.match_color(this->h_fg)
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.value_or(view_colors::MATCH_COLOR_DEFAULT)));
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}
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if (!this->h_bg.empty()) {
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sa.emplace_back(
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lr,
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VC_BACKGROUND.value(
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vc.match_color(this->h_bg)
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.value_or(view_colors::MATCH_COLOR_DEFAULT)));
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}
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if (this->h_role != role_t::VCR_NONE) {
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sa.emplace_back(lr, VC_ROLE.value(this->h_role));
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}
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if (!this->h_attrs.empty()) {
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sa.emplace_back(lr, VC_STYLE.value(this->h_attrs));
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}
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off = matches[1];
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} else {
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off += 1;
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}
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} else {
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off = str.size();
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}
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}
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}
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