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sortix-mirror/editor/highlight.c
Jonas 'Sortie' Termansen 2b72262b4f Relicense Sortix to the ISC license. 
I hereby relicense all my work on Sortix under the ISC license as below.

All Sortix contributions by other people are already under this license,
are not substantial enough to be copyrightable, or have been removed.

All imported code from other projects is compatible with this license.

All GPL licensed code from other projects had previously been removed.

Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors.

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
2016-03-05 22:21:50 +01:00

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/*
* Copyright (c) 2013, 2014, 2015 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* highlight.c
* Syntax highlighting.
*/
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
#include "editor.h"
#include "highlight.h"
enum language language_of_path(const char* path)
{
size_t path_length = strlen(path);
if ( 2 <= path_length &&
(!strcmp(path+path_length-2, ".c") ||
!strcmp(path+path_length-2, ".h")) )
return LANGUAGE_C_CXX;
if ( 4 <= path_length &&
(!strcmp(path+path_length-4, ".c++") ||
!strcmp(path+path_length-4, ".h++") ||
!strcmp(path+path_length-4, ".cxx") ||
!strcmp(path+path_length-4, ".hxx") ||
!strcmp(path+path_length-4, ".cpp") ||
!strcmp(path+path_length-4, ".hpp")) )
return LANGUAGE_C_CXX;
if ( (5 <= path_length && !strcmp(path+path_length-5, ".diff")) ||
(6 <= path_length && !strcmp(path+path_length-6, ".patch")) )
return LANGUAGE_DIFF;
return LANGUAGE_NONE;
}
static size_t recognize_constant(const wchar_t* string, size_t string_length)
{
bool binary = false;
bool hex = false;
size_t result = 0;
if ( result < string_length && string[result] == L'0' )
{
result++;
if ( result < string_length && (string[result] == L'x' ||
string[result] == L'X') )
{
result++;
hex = true;
}
if ( result < string_length && (string[result] == L'b' ||
string[result] == L'B') )
{
result++;
binary = true;
}
}
bool floating = false;
bool exponent = false;
while ( result < string_length )
{
if ( (binary && L'0' <= string[result] && string[result] <= L'1') ||
(!binary && L'0' <= string[result] && string[result] <= L'9') ||
(hex && L'a' <= string[result] && string[result] <= L'f') ||
(hex && L'A' <= string[result] && string[result] <= L'F') )
{
result++;
continue;
}
if ( string[result] == L'.' )
{
if ( binary || hex || floating )
return 0;
floating = true;
result++;
continue;
}
if ( !(hex || binary) &&
(string[result] == L'e' || string[result] == L'E') )
{
if ( !result )
return 0;
if ( exponent )
return 0;
floating = true;
result++;
continue;
}
break;
}
if ( result == ((hex || binary) ? 2 : 0) )
return 0;
if ( floating )
{
if ( result < string_length && (string[result] == L'l' ||
string[result] == L'L') )
result++;
else if ( result < string_length && (string[result] == L'f' ||
string[result] == L'F') )
result++;
}
else
{
if ( result < string_length && (string[result] == L'u' ||
string[result] == L'U') )
result++;
if ( result < string_length && (string[result] == L'l' ||
string[result] == L'L') )
result++;
if ( result < string_length && (string[result] == L'l' ||
string[result] == L'L') )
result++;
}
return result;
}
static void editor_colorize_c_cxx(struct editor* editor);
static void editor_colorize_diff(struct editor* editor);
void editor_colorize(struct editor* editor)
{
if ( editor->color_lines_length != editor->lines_used ||
editor->highlight_source == LANGUAGE_NONE )
{
for ( size_t i = 0; i < editor->color_lines_used; i++ )
free(editor->color_lines[i].data);
free(editor->color_lines);
editor->color_lines_used = 0;
editor->color_lines_length = 0;
editor->color_lines = NULL;
}
if ( editor->highlight_source == LANGUAGE_NONE )
return;
if ( !editor->color_lines )
{
editor->color_lines = (struct color_line*)
malloc(sizeof(struct color_line) * editor->lines_used);
if ( !editor->color_lines )
return;
editor->color_lines_used = editor->lines_used;
editor->color_lines_length = editor->lines_used;
for ( size_t i = 0; i < editor->lines_used; i++ )
editor->color_lines[i].data = NULL,
editor->color_lines[i].length = 0;
}
for ( size_t i = 0; i < editor->lines_used; i++ )
{
if ( editor->color_lines[i].length == editor->lines[i].used )
continue;
editor->color_lines[i].data = (uint8_t*) malloc(editor->lines[i].used);
if ( !editor->color_lines[i].data )
{
for ( size_t n = 0; n < i; i++ )
free(editor->color_lines[n].data);
free(editor->color_lines);
editor->color_lines_used = 0;
editor->color_lines_length = 0;
editor->color_lines = NULL;
return;
}
editor->color_lines[i].length = editor->lines[i].used;
}
switch ( editor->highlight_source )
{
case LANGUAGE_NONE: break;
case LANGUAGE_C_CXX: editor_colorize_c_cxx(editor); break;
case LANGUAGE_DIFF: editor_colorize_diff(editor); break;
}
}
static void editor_colorize_c_cxx(struct editor* editor)
{
enum
{
STATE_INIT,
STATE_LINE_COMMENT,
STATE_MULTI_LINE_COMMENT,
STATE_PREPROCESSOR,
STATE_PREPROCESSOR_VALUE,
STATE_SINGLE_QUOTE,
STATE_DOUBLE_QUOTE,
STATE_NUMBER,
STATE_KEYWORD,
STATE_TYPE,
} state = STATE_INIT, prev_state = STATE_INIT;
bool escaped = false;
size_t fixed_state = 0;
size_t multi_expiration = 0;
for ( size_t y = 0; y < editor->lines_used; y++ )
{
struct line* line = &editor->lines[y];
for ( size_t x = 0; x < line->used; x++ )
{
wchar_t pc = x ? line->data[x-1] : '\0';
wchar_t c = line->data[x];
wchar_t nc = x+1 < line->used ? line->data[x+1] : L'\0';
uint8_t color = 7;
// The character makes you leave this state.
if ( !fixed_state && (state == STATE_KEYWORD ||
state == STATE_TYPE ||
state == STATE_NUMBER ) )
state = STATE_INIT;
// The character makes you enter a new state.
if ( !fixed_state )
{
if ( state == STATE_INIT && c == L'#' )
state = STATE_PREPROCESSOR;
if ( state == STATE_PREPROCESSOR && c == '<' )
state = STATE_PREPROCESSOR_VALUE, fixed_state = 1;
if ( state == STATE_PREPROCESSOR && c == '"' )
state = STATE_PREPROCESSOR_VALUE, fixed_state = 1;
}
// TODO: Detect NULL as a value.
if ( !fixed_state && state == STATE_INIT &&
!(x && (iswalnum(pc) || pc == L'_')) )
{
size_t number_length = recognize_constant(line->data + x,
line->used - x);
if ( number_length )
{
state = STATE_NUMBER;
fixed_state = number_length;
}
}
if ( !fixed_state && state == STATE_INIT && c == L'\'' )
state = STATE_SINGLE_QUOTE, fixed_state = 1, escaped = false;
if ( !fixed_state && state == STATE_INIT && c == L'"' )
state = STATE_DOUBLE_QUOTE, fixed_state = 1, escaped = false;
if ( !fixed_state && (state == STATE_INIT ||
state == STATE_PREPROCESSOR) )
{
if ( c == L'/' && nc == L'/' )
state = STATE_LINE_COMMENT, fixed_state = 2;
else if ( c == L'/' && nc == L'*' )
{
prev_state = state;
multi_expiration = 0;
state = STATE_MULTI_LINE_COMMENT;
fixed_state = 2;
}
}
if ( !fixed_state && state == STATE_INIT )
{
const wchar_t* keywords[] =
{
L"alignas",
L"alignof",
L"and",
L"and_eq",
L"asm",
L"bitand",
L"bitor",
L"break",
L"case",
L"catch",
L"class",
L"compl",
L"const_cast",
L"constexpr",
L"continue",
L"decltype",
L"default",
L"delete",
L"do",
L"dynamic_cast",
L"else",
L"enum",
L"false",
L"final",
L"for",
L"friend",
L"goto",
L"if",
L"namespace",
L"new",
L"not",
L"not_eq",
L"nullptr",
L"operator",
L"or",
L"or_eq",
L"override",
L"private",
L"protected",
L"public",
L"reinterpret_cast",
L"return",
L"sizeof",
L"static_assert",
L"static_cast",
L"struct",
L"switch",
L"template",
L"this",
L"thread_local",
L"throw",
L"true",
L"try",
L"typedef",
L"typeid",
L"typename",
L"union",
L"using",
L"virtual",
L"while",
L"xor",
L"xor_eq",
};
bool cannot_be_keyword = x && (iswalnum(pc) || pc == L'_');
for ( size_t i = 0;
!cannot_be_keyword && i < sizeof(keywords) / sizeof(keywords[0]);
i++ )
{
const wchar_t* keyword = keywords[i];
if ( c != keyword[0] )
continue;
size_t keyword_length = wcslen(keyword);
if ( (x - line->used) < keyword_length )
continue;
if ( wcsncmp(line->data + x, keyword, keyword_length) != 0 )
continue;
if ( keyword_length < line->used - x )
{
wchar_t wc = line->data[x + keyword_length];
if ( iswalnum(wc) || wc == L'_' )
continue;
}
state = STATE_KEYWORD;
fixed_state = keyword_length;
}
}
if ( !fixed_state && state == STATE_INIT )
{
const wchar_t* types[] =
{
L"auto",
L"blkcnt_t",
L"blksize_t",
L"bool",
L"char",
L"char16_t",
L"char32_t",
L"clockid_t",
L"clock_t",
L"const",
L"dev_t",
L"double",
L"explicit",
L"extern",
L"FILE",
L"float",
L"fpos_t",
L"fsblkcnt_t",
L"fsfilcnt_t",
L"gid_t",
L"id_t",
L"inline",
L"ino_t",
L"int",
L"int16_t",
L"int32_t",
L"int64_t",
L"int8_t",
L"intmax_t",
L"intptr_t",
L"locale_t",
L"long",
L"mode_t",
L"mutable",
L"nlink_t",
L"noexcept",
L"off_t",
L"pid_t",
L"ptrdiff_t",
L"register",
L"restrict",
L"short",
L"signed",
L"size_t",
L"ssize_t",
L"static",
L"suseconds_t",
L"thread_local",
L"timer_t",
L"time_t",
L"trace_t",
L"uid_t",
L"uint16_t",
L"uint32_t",
L"uint64_t",
L"uint8_t",
L"uintmax_t",
L"uintptr_t",
L"unsigned",
L"useconds_t",
L"va_list",
L"void",
L"volatile",
L"wchar_t",
};
bool cannot_be_type = x && (iswalnum(pc) || pc == L'_');
for ( size_t i = 0;
!cannot_be_type && i < sizeof(types) / sizeof(types[0]);
i++ )
{
const wchar_t* type = types[i];
if ( c != type[0] )
continue;
size_t type_length = wcslen(type);
if ( (x - line->used) < type_length )
continue;
if ( wcsncmp(line->data + x, type, type_length) != 0 )
continue;
if ( (x - line->used) != type_length &&
(iswalnum(line->data[x+type_length]) ||
line->data[x+type_length] == L'_') )
continue;
state = STATE_TYPE;
fixed_state = type_length;
}
}
// The current state uses a non-default color.
if ( state == STATE_SINGLE_QUOTE ||
state == STATE_DOUBLE_QUOTE ||
state == STATE_NUMBER ||
state == STATE_PREPROCESSOR_VALUE )
color = 5;
if ( state == STATE_PREPROCESSOR )
color = 3;
if ( state == STATE_LINE_COMMENT ||
state == STATE_MULTI_LINE_COMMENT )
color = 6;
if ( state == STATE_KEYWORD )
color = 1;
if ( state == STATE_TYPE )
color = 2;
// The character is the last character in this state.
if ( !fixed_state )
{
if ( state == STATE_SINGLE_QUOTE && !escaped && c == L'\'' )
state = STATE_INIT, fixed_state = 1;
if ( state == STATE_DOUBLE_QUOTE && !escaped && c == L'"' )
state = STATE_INIT, fixed_state = 1;
if ( state == STATE_PREPROCESSOR_VALUE && c == '>' )
state = STATE_PREPROCESSOR;
if ( state == STATE_PREPROCESSOR_VALUE && c == '"' )
state = STATE_PREPROCESSOR;
}
if ( (state == STATE_SINGLE_QUOTE || state == STATE_DOUBLE_QUOTE) )
{
if ( !escaped && c == L'\\' )
escaped = true;
else if ( escaped )
escaped = false;
}
if ( !fixed_state && state == STATE_MULTI_LINE_COMMENT )
{
if ( multi_expiration == 1 )
state = prev_state, multi_expiration = 0;
else if ( c == L'*' && nc == L'/' )
multi_expiration = 1;
}
if ( state == STATE_PREPROCESSOR )
escaped = c == L'\\' && !nc;
editor->color_lines[y].data[x] = color;
if ( fixed_state )
fixed_state--;
}
if ( state == STATE_LINE_COMMENT ||
state == STATE_PREPROCESSOR ||
state == STATE_PREPROCESSOR_VALUE ||
state == STATE_SINGLE_QUOTE ||
state == STATE_DOUBLE_QUOTE )
{
if ( state == STATE_PREPROCESSOR && escaped )
escaped = false;
else
state = STATE_INIT;
}
}
}
static void editor_colorize_diff(struct editor* editor)
{
for ( size_t y = 0; y < editor->lines_used; y++ )
{
struct line* line = &editor->lines[y];
uint8_t color = 7;
if ( line->used && line->data[0] == L'-' )
color = 1;
else if ( line->used && line->data[0] == L'+' )
color = 2;
else if ( line->used && line->data[0] == L'@' )
color = 6;
else if ( line->used && !iswblank(line->data[0]) )
color = 4 + 8;
for ( size_t x = 0; x < line->used; x++ )
{
editor->color_lines[y].data[x] = color;
}
}
}
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