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Diffstat (limited to 'gdb/ui-style.c')
| -rw-r--r-- | gdb/ui-style.c | 413 |
1 files changed, 413 insertions, 0 deletions
diff --git a/gdb/ui-style.c b/gdb/ui-style.c new file mode 100644 index 0000000..059824f --- /dev/null +++ b/gdb/ui-style.c @@ -0,0 +1,413 @@ +/* Styling for ui_file + Copyright (C) 2018 Free Software Foundation, Inc. + + This file is part of GDB. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +#include "defs.h" +#include "ui-style.h" + +/* A regular expression that is used for matching ANSI terminal escape + sequences. */ + +static const char *ansi_regex_text = + /* Introduction. */ + "^\033\\[" +#define DATA_SUBEXP 1 + /* Capture parameter and intermediate bytes. */ + "(" + /* Parameter bytes. */ + "[\x30-\x3f]*" + /* Intermediate bytes. */ + "[\x20-\x2f]*" + /* End the first capture. */ + ")" + /* The final byte. */ +#define FINAL_SUBEXP 2 + "([\x40-\x7e])"; + +/* The number of subexpressions to allocate space for, including the + "0th" whole match subexpression. */ +#define NUM_SUBEXPRESSIONS 3 + +/* The compiled form of ansi_regex_text. */ + +static regex_t ansi_regex; + +/* This maps bright colors to RGB triples. The index is the bright + color index, starting with bright black. The values come from + xterm. */ + +static const uint8_t bright_colors[][3] = { + { 127, 127, 127 }, /* Black. */ + { 255, 0, 0 }, /* Red. */ + { 0, 255, 0 }, /* Green. */ + { 255, 255, 0 }, /* Yellow. */ + { 92, 92, 255 }, /* Blue. */ + { 255, 0, 255 }, /* Magenta. */ + { 0, 255, 255 }, /* Cyan. */ + { 255, 255, 255 } /* White. */ +}; + +/* See ui-style.h. */ + +bool +ui_file_style::color::append_ansi (bool is_fg, std::string *str) const +{ + if (m_simple) + { + if (m_value >= BLACK && m_value <= WHITE) + str->append (std::to_string (m_value + (is_fg ? 30 : 40))); + else if (m_value > WHITE && m_value <= WHITE + 8) + str->append (std::to_string (m_value - WHITE + (is_fg ? 90 : 100))); + else if (m_value != -1) + { + str->append (is_fg ? "38;5;" : "48;5;"); + str->append (std::to_string (m_value)); + } + else + return false; + } + else + { + str->append (is_fg ? "38;2;" : "48;2;"); + str->append (std::to_string (m_red) + + ";" + std::to_string (m_green) + + ";" + std::to_string (m_blue)); + } + return true; +} + +/* See ui-style.h. */ + +void +ui_file_style::color::get_rgb (uint8_t *rgb) const +{ + if (m_simple) + { + /* Can't call this for a basic color or NONE -- those will end + up in the assert below. */ + if (m_value >= 8 && m_value <= 15) + memcpy (rgb, bright_colors[m_value - 8], 3 * sizeof (uint8_t)); + else if (m_value >= 16 && m_value <= 231) + { + int value = m_value; + value -= 16; + /* This obscure formula seems to be what terminals actually + do. */ + int component = value / 36; + rgb[0] = component == 0 ? 0 : (55 + component * 40); + value %= 36; + component = value / 6; + rgb[1] = component == 0 ? 0 : (55 + component * 40); + value %= 6; + rgb[2] = value == 0 ? 0 : (55 + value * 40); + } + else if (m_value >= 232) + { + uint8_t v = (m_value - 232) * 10 + 8; + rgb[0] = v; + rgb[1] = v; + rgb[2] = v; + } + else + gdb_assert_not_reached ("get_rgb called on invalid color"); + } + else + { + rgb[0] = m_red; + rgb[1] = m_green; + rgb[2] = m_blue; + } +} + +/* See ui-style.h. */ + +std::string +ui_file_style::to_ansi () const +{ + std::string result ("\033["); + bool need_semi = m_foreground.append_ansi (true, &result); + if (!m_background.is_none ()) + { + if (need_semi) + result.push_back (';'); + m_background.append_ansi (false, &result); + need_semi = true; + } + if (m_intensity != NORMAL) + { + if (need_semi) + result.push_back (';'); + result.append (std::to_string (m_intensity)); + need_semi = true; + } + if (m_reverse) + { + if (need_semi) + result.push_back (';'); + result.push_back ('7'); + } + result.push_back ('m'); + return result; +} + +/* Read a ";" and a number from STRING. Return the number of + characters read and put the number into *NUM. */ + +static bool +read_semi_number (const char *string, int *idx, long *num) +{ + if (string[*idx] != ';') + return false; + ++*idx; + if (string[*idx] < '0' || string[*idx] > '9') + return false; + char *tail; + *num = strtol (string + *idx, &tail, 10); + *idx = tail - string; + return true; +} + +/* A helper for ui_file_style::parse that reads an extended color + sequence; that is, and 8- or 24- bit color. */ + +static bool +extended_color (const char *str, int *idx, ui_file_style::color *color) +{ + long value; + + if (!read_semi_number (str, idx, &value)) + return false; + + if (value == 5) + { + /* 8-bit color. */ + if (!read_semi_number (str, idx, &value)) + return false; + + if (value >= 0 && value <= 255) + *color = ui_file_style::color (value); + else + return false; + } + else if (value == 2) + { + /* 24-bit color. */ + long r, g, b; + if (!read_semi_number (str, idx, &r) + || r > 255 + || !read_semi_number (str, idx, &g) + || g > 255 + || !read_semi_number (str, idx, &b) + || b > 255) + return false; + *color = ui_file_style::color (r, g, b); + } + else + { + /* Unrecognized sequence. */ + return false; + } + + return true; +} + +/* See ui-style.h. */ + +bool +ui_file_style::parse (const char *buf, size_t *n_read) +{ + regmatch_t subexps[NUM_SUBEXPRESSIONS]; + + int match = regexec (&ansi_regex, buf, ARRAY_SIZE (subexps), subexps, 0); + if (match == REG_NOMATCH) + { + *n_read = 0; + return false; + } + /* Other failures mean the regexp is broken. */ + gdb_assert (match == 0); + /* The regexp is anchored. */ + gdb_assert (subexps[0].rm_so == 0); + /* The final character exists. */ + gdb_assert (subexps[FINAL_SUBEXP].rm_eo - subexps[FINAL_SUBEXP].rm_so == 1); + + if (buf[subexps[FINAL_SUBEXP].rm_so] != 'm') + { + /* We don't handle this sequence, so just drop it. */ + *n_read = subexps[0].rm_eo; + return false; + } + + /* Examine each setting in the match and apply it to the result. + See the Select Graphic Rendition section of + https://en.wikipedia.org/wiki/ANSI_escape_code. In essence each + code is just a number, separated by ";"; there are some more + wrinkles but we don't support them all.. */ + + /* "\033[m" means the same thing as "\033[0m", so handle that + specially here. */ + if (subexps[DATA_SUBEXP].rm_so == subexps[DATA_SUBEXP].rm_eo) + *this = ui_file_style (); + + for (regoff_t i = subexps[DATA_SUBEXP].rm_so; + i < subexps[DATA_SUBEXP].rm_eo; + ++i) + { + if (buf[i] == ';') + { + /* Skip. */ + } + else if (buf[i] >= '0' && buf[i] <= '9') + { + char *tail; + long value = strtol (buf + i, &tail, 10); + i = tail - buf; + + switch (value) + { + case 0: + /* Reset. */ + *this = ui_file_style (); + break; + case 1: + /* Bold. */ + m_intensity = BOLD; + break; + case 2: + /* Dim. */ + m_intensity = DIM; + break; + case 7: + /* Reverse. */ + m_reverse = true; + break; + case 21: + m_intensity = NORMAL; + break; + case 22: + /* Normal. */ + m_intensity = NORMAL; + break; + case 27: + /* Inverse off. */ + m_reverse = false; + break; + + case 30: + case 31: + case 32: + case 33: + case 34: + case 35: + case 36: + case 37: + /* Note: not 38. */ + case 39: + m_foreground = color (value - 30); + break; + + case 40: + case 41: + case 42: + case 43: + case 44: + case 45: + case 46: + case 47: + /* Note: not 48. */ + case 49: + m_background = color (value - 40); + break; + + case 90: + case 91: + case 92: + case 93: + case 94: + case 95: + case 96: + case 97: + m_foreground = color (value - 90 + 8); + break; + + case 100: + case 101: + case 102: + case 103: + case 104: + case 105: + case 106: + case 107: + m_background = color (value - 100 + 8); + break; + + case 38: + /* If we can't parse the extended color, fail. */ + if (!extended_color (buf, &i, &m_foreground)) + { + *n_read = subexps[0].rm_eo; + return false; + } + break; + + case 48: + /* If we can't parse the extended color, fail. */ + if (!extended_color (buf, &i, &m_background)) + { + *n_read = subexps[0].rm_eo; + return false; + } + break; + + default: + /* Ignore everything else. */ + break; + } + } + else + { + /* Unknown, let's just ignore. */ + } + } + + *n_read = subexps[0].rm_eo; + return true; +} + +/* See ui-style.h. */ + +bool +skip_ansi_escape (const char *buf, int *n_read) +{ + regmatch_t subexps[NUM_SUBEXPRESSIONS]; + + int match = regexec (&ansi_regex, buf, ARRAY_SIZE (subexps), subexps, 0); + if (match == REG_NOMATCH || buf[subexps[FINAL_SUBEXP].rm_so] != 'm') + return false; + + *n_read = subexps[FINAL_SUBEXP].rm_eo; + return true; +} + +void +_initialize_ui_style () +{ + int code = regcomp (&ansi_regex, ansi_regex_text, REG_EXTENDED); + /* If the regular expression was incorrect, it was a programming + error. */ + gdb_assert (code == 0); +} |