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