polybar/include/components/parser.hpp

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2016-06-15 03:32:35 +00:00
#pragma once
#include <fastdelegate/fastdelegate.hpp>
#include "common.hpp"
#include "components/logger.hpp"
#include "components/types.hpp"
#include "utils/math.hpp"
#include "utils/string.hpp"
LEMONBUDDY_NS
DEFINE_ERROR(unrecognized_token);
namespace parser_signals {
delegate::Signal1<alignment> alignment_change;
delegate::Signal1<attribute> attribute_set;
delegate::Signal1<attribute> attribute_unset;
delegate::Signal1<attribute> attribute_toggle;
delegate::Signal2<mousebtn, string> action_block_open;
delegate::Signal1<mousebtn> action_block_close;
delegate::Signal2<gc, color> color_change;
delegate::Signal1<int> font_change;
delegate::Signal1<int> pixel_offset;
delegate::Signal1<uint16_t> ascii_text_write;
delegate::Signal1<uint16_t> unicode_text_write;
};
class parser {
public:
/**
* Construct parser
*/
explicit parser(const bar_settings& bar) : m_bar(bar) {}
/**
* Parse input data
*/
void operator()(string data) { // {{{
size_t pos;
while (data.length()) {
if (data.compare(0, 2, "%{") == 0 && (pos = data.find("}")) != string::npos) {
codeblock(data.substr(2, pos - 2));
data.erase(0, pos + 1);
} else {
if ((pos = data.find("%{")) == string::npos)
pos = data.length();
data.erase(0, text(data.substr(0, pos)));
}
}
} // }}}
/**
* Parse contents in tag blocks, i.e: %{...}
*/
void codeblock(string data) { // {{{
size_t pos;
while (data.length()) {
data = string_util::ltrim(data, ' ');
if (data.empty())
break;
char tag = data[0];
string value;
// Remove the tag
data.erase(0, 1);
if ((pos = data.find_first_of(" }")) != string::npos)
value = data.substr(0, pos);
else
value = data;
switch (tag) {
case 'B':
// Ignore tag if it occurs again later in the same block
if (data.find(" B") == string::npos && !parser_signals::color_change.empty())
parser_signals::color_change.emit(gc::BG, parse_color(value, m_bar.background));
break;
case 'F':
// Ignore tag if it occurs again later in the same block
if (data.find(" F") == string::npos && !parser_signals::color_change.empty())
parser_signals::color_change.emit(gc::FG, parse_color(value, m_bar.foreground));
break;
case 'U':
// Ignore tag if it occurs again later in the same block
if (data.find(" U") == string::npos && !parser_signals::color_change.empty()) {
parser_signals::color_change.emit(gc::UL, parse_color(value, m_bar.linecolor));
parser_signals::color_change.emit(gc::OL, parse_color(value, m_bar.linecolor));
}
break;
case 'R':
if (!parser_signals::color_change.empty()) {
parser_signals::color_change.emit(gc::BG, m_bar.foreground);
parser_signals::color_change.emit(gc::FG, m_bar.background);
}
break;
case 'T':
if (data.find(" T") == string::npos && !parser_signals::font_change.empty())
parser_signals::font_change.emit(parse_fontindex(value));
break;
case 'O':
if (!parser_signals::pixel_offset.empty())
parser_signals::pixel_offset.emit(std::atoi(value.c_str()));
break;
case 'l':
if (!parser_signals::alignment_change.empty())
parser_signals::alignment_change.emit(alignment::LEFT);
break;
case 'c':
if (!parser_signals::alignment_change.empty())
parser_signals::alignment_change.emit(alignment::CENTER);
break;
case 'r':
if (!parser_signals::alignment_change.empty())
parser_signals::alignment_change.emit(alignment::RIGHT);
break;
case '+':
if (!parser_signals::attribute_set.empty())
parser_signals::attribute_set.emit(parse_attr(value[0]));
break;
case '-':
if (!parser_signals::attribute_unset.empty())
parser_signals::attribute_unset.emit(parse_attr(value[0]));
break;
case '!':
if (!parser_signals::attribute_toggle.empty())
parser_signals::attribute_toggle.emit(parse_attr(value[0]));
break;
case 'A':
if (isdigit(data[0])) {
value = parse_action_cmd(data);
if (!parser_signals::action_block_open.empty())
parser_signals::action_block_open.emit(parse_action_btn(data), value);
m_actions.push_back(data[0] - '0');
value += "0::"; // make sure we strip the correct length (btn+wrapping colons)
} else {
if (!parser_signals::action_block_close.empty())
parser_signals::action_block_close.emit(parse_action_btn(data));
m_actions.pop_back();
}
break;
default:
throw unrecognized_token(string{tag});
}
if (!data.empty())
data.erase(0, !value.empty() ? value.length() : 1);
}
} // }}}
/**
* Parse text strings
*/
size_t text(string data) { // {{{
uint8_t* utf = (uint8_t*)data.c_str();
// if (utf[0] < 0x80) {
// // grab all consecutive ascii chars
// size_t next_tag = data.find("%{");
// string sequence{(next_tag != string::npos) ? data.substr(0, next_tag) : data};
// size_t n = 0;
// while (sequence[n] != '\0' && static_cast<uint8_t>(sequence[n]) < 0x80 && ++n <= next_tag)
// ;
// parser_signals::ascii_text_write.emit(data.substr(0, n));
// return data.length();
// }
if (utf[0] < 0x80) {
parser_signals::ascii_text_write.emit(utf[0]);
return 1;
} else if ((utf[0] & 0xe0) == 0xc0) { // 2 byte utf-8 sequence
parser_signals::unicode_text_write.emit((utf[0] & 0x1f) << 6 | (utf[1] & 0x3f));
return 2;
} else if ((utf[0] & 0xf0) == 0xe0) { // 3 byte utf-8 sequence
parser_signals::unicode_text_write.emit(
(utf[0] & 0xf) << 12 | (utf[1] & 0x3f) << 6 | (utf[2] & 0x3f));
return 3;
} else if ((utf[0] & 0xf8) == 0xf0) { // 4 byte utf-8 sequence
parser_signals::unicode_text_write.emit(0xfffd);
return 4;
} else if ((utf[0] & 0xfc) == 0xf8) { // 5 byte utf-8 sequence
parser_signals::unicode_text_write.emit(0xfffd);
return 5;
} else if ((utf[0] & 0xfe) == 0xfc) { // 6 byte utf-8 sequence
parser_signals::unicode_text_write.emit(0xfffd);
return 6;
} else { // invalid utf-8 sequence
parser_signals::ascii_text_write.emit(utf[0]);
return 1;
}
} // }}}
protected:
color parse_color(string s, color fallback = color{0}) { // {{{
if (s.empty() || s == "-")
return fallback;
return color::parse(s, fallback);
} // }}}
int parse_fontindex(string s) { // {{{
if (s.empty() || s == "-")
return -1;
char* p = (char*)s.c_str();
return std::strtoul(p, &p, 10);
} // }}}
attribute parse_attr(const char s) { // {{{
switch (s) {
case 'o':
return attribute::o;
break;
case 'u':
return attribute::u;
break;
}
return attribute::NONE;
} // }}}
mousebtn parse_action_btn(string data) { // {{{
if (isdigit(data[0]))
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return static_cast<mousebtn>(data[0] - '0');
else if (!m_actions.empty())
return static_cast<mousebtn>(m_actions.back());
else
return mousebtn::NONE;
} // }}}
string parse_action_cmd(string data) { // {{{
auto start = string_util::find_nth(data, 0, ":", 1);
auto end = string_util::find_nth(data, 0, ":", 2);
return string_util::trim(data.substr(start, end), ':');
} // }}}
private:
const bar_settings& m_bar;
vector<int> m_actions;
};
LEMONBUDDY_NS_END