mirror of https://github.com/tstack/lnav.git
345 lines
12 KiB
C++
345 lines
12 KiB
C++
/**
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* Copyright (c) 2022, 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 "snippet_highlighters.hh"
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#include "attr_line.builder.hh"
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#include "pcrepp/pcre2pp.hh"
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#include "view_curses.hh"
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namespace lnav {
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namespace snippets {
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static bool
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is_bracket(const std::string& str, int index, bool is_lit)
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{
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if (index == 0) {
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return true;
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}
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if (is_lit && str[index - 1] == '\\') {
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return true;
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}
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if (!is_lit && str[index - 1] != '\\') {
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return true;
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}
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return false;
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}
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static void
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find_matching_bracket(
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attr_line_t& al, int x, line_range sub, char left, char right)
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{
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bool is_lit = (left == 'Q');
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attr_line_builder alb(al);
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const auto& line = al.get_string();
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int depth = 0;
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if (x < sub.lr_start || x > sub.lr_end) {
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return;
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}
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if (line[x] == right && is_bracket(line, x, is_lit)) {
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for (int lpc = x - 1; lpc >= sub.lr_start; lpc--) {
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if (line[lpc] == right && is_bracket(line, lpc, is_lit)) {
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depth += 1;
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} else if (line[lpc] == left && is_bracket(line, lpc, is_lit)) {
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if (depth == 0) {
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alb.overlay_attr_for_char(
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lpc, VC_STYLE.value(text_attrs{A_BOLD | A_REVERSE}));
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alb.overlay_attr_for_char(lpc,
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VC_ROLE.value(role_t::VCR_OK));
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break;
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}
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depth -= 1;
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}
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}
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}
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if (line[x] == left && is_bracket(line, x, is_lit)) {
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for (int lpc = x + 1; lpc < sub.lr_end; lpc++) {
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if (line[lpc] == left && is_bracket(line, lpc, is_lit)) {
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depth += 1;
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} else if (line[lpc] == right && is_bracket(line, lpc, is_lit)) {
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if (depth == 0) {
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alb.overlay_attr_for_char(
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lpc, VC_STYLE.value(text_attrs{A_BOLD | A_REVERSE}));
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alb.overlay_attr_for_char(lpc,
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VC_ROLE.value(role_t::VCR_OK));
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break;
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}
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depth -= 1;
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}
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}
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}
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nonstd::optional<int> first_left;
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depth = 0;
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for (auto lpc = sub.lr_start; lpc < sub.lr_end; lpc++) {
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if (line[lpc] == left && is_bracket(line, lpc, is_lit)) {
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depth += 1;
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if (!first_left) {
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first_left = lpc;
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}
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} else if (line[lpc] == right && is_bracket(line, lpc, is_lit)) {
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if (depth > 0) {
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depth -= 1;
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} else {
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auto lr = line_range(is_lit ? lpc - 1 : lpc, lpc + 1);
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alb.overlay_attr(
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lr, VC_STYLE.value(text_attrs{A_BOLD | A_REVERSE}));
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alb.overlay_attr(lr, VC_ROLE.value(role_t::VCR_ERROR));
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}
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}
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}
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if (depth > 0) {
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auto lr
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= line_range(is_lit ? first_left.value() - 1 : first_left.value(),
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first_left.value() + 1);
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alb.overlay_attr(lr, VC_STYLE.value(text_attrs{A_BOLD | A_REVERSE}));
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alb.overlay_attr(lr, VC_ROLE.value(role_t::VCR_ERROR));
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}
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}
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static bool
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check_re_prev(const std::string& line, int x)
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{
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bool retval = false;
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if ((x > 0 && line[x - 1] != ')' && line[x - 1] != ']' && line[x - 1] != '*'
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&& line[x - 1] != '?' && line[x - 1] != '+')
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&& (x < 2 || line[x - 2] != '\\'))
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{
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retval = true;
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}
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return retval;
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}
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static char
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safe_read(const std::string& str, std::string::size_type index)
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{
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if (index < str.length()) {
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return str.at(index);
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}
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return 0;
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}
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void
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regex_highlighter(attr_line_t& al, int x, line_range sub)
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{
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static const char* brackets[] = {
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"[]",
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"{}",
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"()",
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"QE",
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nullptr,
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};
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const auto& line = al.get_string();
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attr_line_builder alb(al);
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bool backslash_is_quoted = false;
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for (auto lpc = sub.lr_start; lpc < sub.lr_end; lpc++) {
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if (lpc == 0 || line[lpc - 1] != '\\') {
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switch (line[lpc]) {
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case '^':
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case '$':
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case '*':
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case '+':
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case '|':
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case '.':
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alb.overlay_attr_for_char(
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lpc, VC_ROLE.value(role_t::VCR_RE_SPECIAL));
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if ((line[lpc] == '*' || line[lpc] == '+')
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&& check_re_prev(line, lpc))
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{
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alb.overlay_attr_for_char(
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lpc - 1, VC_ROLE.value(role_t::VCR_RE_REPEAT));
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}
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break;
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case '?': {
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struct line_range lr(lpc, lpc + 1);
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if (lpc == sub.lr_start || (lpc - sub.lr_start) == 0) {
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alb.overlay_attr_for_char(
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lpc,
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VC_STYLE.value(text_attrs{A_BOLD | A_REVERSE}));
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alb.overlay_attr_for_char(
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lpc, VC_ROLE.value(role_t::VCR_ERROR));
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} else if (line[lpc - 1] == '(') {
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switch (line[lpc + 1]) {
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case ':':
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case '!':
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case '#':
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lr.lr_end += 1;
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break;
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}
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alb.overlay_attr(lr, VC_ROLE.value(role_t::VCR_OK));
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if (line[lpc + 1] == '<') {
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alb.overlay_attr(
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line_range(lpc + 1, lpc + 2),
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VC_ROLE.value(role_t::VCR_RE_SPECIAL));
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}
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} else {
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alb.overlay_attr(lr,
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VC_ROLE.value(role_t::VCR_RE_SPECIAL));
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if (check_re_prev(line, lpc)) {
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alb.overlay_attr_for_char(
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lpc - 1, VC_ROLE.value(role_t::VCR_RE_REPEAT));
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}
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}
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break;
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}
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case '>': {
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static const auto CAP_RE
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= lnav::pcre2pp::code::from_const(R"(\(\?\<\w+$)");
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auto capture_start
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= string_fragment::from_str_range(
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line, sub.lr_start, lpc)
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.find_left_boundary(lpc - sub.lr_start - 1,
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string_fragment::tag1{'('});
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auto cap_find_res
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= CAP_RE.find_in(capture_start).ignore_error();
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if (cap_find_res) {
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alb.overlay_attr(
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line_range(capture_start.sf_begin
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+ cap_find_res->f_all.sf_begin + 3,
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capture_start.sf_begin
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+ cap_find_res->f_all.sf_end),
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VC_ROLE.value(role_t::VCR_IDENTIFIER));
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alb.overlay_attr(line_range(lpc, lpc + 1),
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VC_ROLE.value(role_t::VCR_RE_SPECIAL));
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}
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break;
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}
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case '(':
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case ')':
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case '{':
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case '}':
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case '[':
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case ']':
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alb.overlay_attr_for_char(lpc,
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VC_ROLE.value(role_t::VCR_OK));
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break;
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}
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}
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if (lpc > 0 && line[lpc - 1] == '\\') {
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if (backslash_is_quoted) {
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backslash_is_quoted = false;
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continue;
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}
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switch (line[lpc]) {
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case '\\':
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backslash_is_quoted = true;
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alb.overlay_attr(line_range(lpc - 1, lpc + 1),
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VC_ROLE.value(role_t::VCR_RE_SPECIAL));
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break;
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case 'd':
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case 'D':
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case 'h':
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case 'H':
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case 'N':
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case 'R':
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case 's':
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case 'S':
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case 'v':
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case 'V':
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case 'w':
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case 'W':
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case 'X':
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case 'A':
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case 'b':
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case 'B':
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case 'G':
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case 'Z':
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case 'z':
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alb.overlay_attr(line_range(lpc - 1, lpc + 1),
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VC_ROLE.value(role_t::VCR_SYMBOL));
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break;
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case ' ':
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alb.overlay_attr(
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line_range(lpc - 1, lpc + 1),
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VC_STYLE.value(text_attrs{A_BOLD | A_REVERSE}));
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alb.overlay_attr(line_range(lpc - 1, lpc + 1),
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VC_ROLE.value(role_t::VCR_ERROR));
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break;
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case '0':
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case 'x':
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if (safe_read(line, lpc + 1) == '{') {
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alb.overlay_attr(line_range(lpc - 1, lpc + 1),
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VC_ROLE.value(role_t::VCR_RE_SPECIAL));
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} else if (isdigit(safe_read(line, lpc + 1))
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&& isdigit(safe_read(line, lpc + 2)))
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{
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alb.overlay_attr(line_range(lpc - 1, lpc + 3),
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VC_ROLE.value(role_t::VCR_RE_SPECIAL));
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} else {
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alb.overlay_attr(
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line_range(lpc - 1, lpc + 1),
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VC_STYLE.value(text_attrs{A_BOLD | A_REVERSE}));
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alb.overlay_attr(line_range(lpc - 1, lpc + 1),
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VC_ROLE.value(role_t::VCR_ERROR));
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}
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break;
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case 'Q':
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case 'E':
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alb.overlay_attr(line_range(lpc - 1, lpc + 1),
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VC_ROLE.value(role_t::VCR_OK));
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break;
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default:
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if (isdigit(line[lpc])) {
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alb.overlay_attr(line_range(lpc - 1, lpc + 1),
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VC_ROLE.value(role_t::VCR_RE_SPECIAL));
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}
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break;
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}
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}
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}
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for (int lpc = 0; brackets[lpc]; lpc++) {
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find_matching_bracket(al, x, sub, brackets[lpc][0], brackets[lpc][1]);
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}
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}
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} // namespace snippets
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} // namespace lnav
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