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#include "syntax.h"
#include <string.h>
#include "editor.h"
char* c_highlight_extensions[] = { ".c", ".h", ".cpp", ".cc", NULL };
char* c_highlight_keywords[] = {
"switch", "if", "while", "for", "break", "continue", "return", "else",
"struct", "union", "typedef", "static", "enum", "class", "case",
"#include", "#define", "#ifdef", "#ifndef",
"int|", "long|", "double|", "float|", "char|", "unsigned|", "signed|",
"void|", NULL
};
struct editor_syntax highlight_database[] = {
{
"c",
c_highlight_extensions,
c_highlight_keywords,
"//", "/*", "*/",
HIGHLIGHT_FLAG_NUMBERS | HIGHLIGHT_FLAG_STRINGS
}
};
int is_separator(int c)
{
return isspace(c) || c == '\0' || strchr(",.()+-/*=~%<>[];", c) != NULL;
}
void editor_update_syntax(struct editor_state* editor, struct editor_row* row)
{
row->highlight = realloc(row->highlight, row->render_size);
memset(row->highlight, HIGHLIGHT_NORMAL, row->render_size);
if (editor->syntax == NULL)
return;
char** keywords = editor->syntax->keywords;
// TODO: Remove
char* single_line_comment_start = editor->syntax->single_line_comment_start;
char* multi_line_comment_start = editor->syntax->multi_line_comment_start;
char* multi_line_comment_end = editor->syntax->multi_line_comment_end;
int single_line_comment_start_length = single_line_comment_start ? strlen(single_line_comment_start) : 0;
int multi_line_comment_start_length = multi_line_comment_start ? strlen(multi_line_comment_start) : 0;
int multi_line_comment_end_length = multi_line_comment_end ? strlen(multi_line_comment_end) : 0;
int previous_separator = 1;
int in_string = 0;
int in_comment = (row->index > 0 && editor->rows[row->index - 1].highlight_open_comment);
int i = 0;
while (i < row->render_size) {
char c = row->render[i];
unsigned char previous_highlight = (i > 0) ? row->highlight[i - 1] : HIGHLIGHT_NORMAL;
if (single_line_comment_start_length && !in_string && !in_comment) {
if (!strncmp(&row->render[i], single_line_comment_start, single_line_comment_start_length)) {
memset(&row->highlight[i], HIGHLIGHT_COMMENT, row->render_size - i);
break;
}
}
if (multi_line_comment_start_length && multi_line_comment_end_length && !in_string) {
if (in_comment) {
row->highlight[i] = HIGHLIGHT_MULTILINE_COMMENT;
if (!strncmp(&row->render[i], multi_line_comment_end, multi_line_comment_end_length)) {
memset(&row->highlight[i], HIGHLIGHT_MULTILINE_COMMENT, multi_line_comment_end_length);
i += multi_line_comment_end_length;
in_comment = 0;
previous_separator = 1;
continue;
} else {
i++;
continue;
}
} else if (!strncmp(&row->render[i], multi_line_comment_start, multi_line_comment_start_length)) {
memset(&row->highlight[i], HIGHLIGHT_MULTILINE_COMMENT, multi_line_comment_start_length);
i += multi_line_comment_start_length;
in_comment = 1;
continue;
}
}
if (editor->syntax->flags & HIGHLIGHT_FLAG_STRINGS) {
if (in_string) {
row->highlight[i] = HIGHLIGHT_STRING;
if (c == '\\' && i + 1 < row->render_size) {
row->highlight[i + 1] = HIGHLIGHT_STRING;
i += 2;
continue;
}
if (c == in_string)
in_string = 0;
i++;
previous_separator = 1;
continue;
} else {
if (c == '"' || c == '\'') {
in_string = c;
row->highlight[i] = HIGHLIGHT_STRING;
i++;
continue;
}
}
}
if (editor->syntax->flags & HIGHLIGHT_FLAG_NUMBERS) {
if ((isdigit(c) && (previous_separator || previous_highlight == HIGHLIGHT_NUMBER)) || (c == '.' && previous_highlight == HIGHLIGHT_NUMBER)) {
row->highlight[i] = HIGHLIGHT_NUMBER;
i++;
previous_separator = 0;
continue;
}
}
if (previous_separator) {
int j;
for (j = 0; keywords[j]; j++) {
int keyword_length = strlen(keywords[j]);
int is_secondary = keywords[j][keyword_length - 1] == '|';
if (is_secondary)
keyword_length--;
if (!strncmp(&row->render[i], keywords[j], keyword_length) && is_separator(row->render[i + keyword_length])) {
memset(&row->highlight[i], is_secondary ? HIGHLIGHT_KEYWORD2 : HIGHLIGHT_KEYWORD1, keyword_length);
i += keyword_length;
break;
}
}
if (keywords[j] != NULL) {
previous_separator = 0;
continue;
}
}
previous_separator = is_separator(c);
i++;
}
int changed = (row->highlight_open_comment != in_comment);
row->highlight_open_comment = in_comment;
if (changed && row->index + 1 < editor->row_count)
editor_update_syntax(editor, &editor->rows[row->index + 1]);
}
int editor_syntax_to_colour(int highlight)
{
switch (highlight) {
case HIGHLIGHT_MULTILINE_COMMENT:
case HIGHLIGHT_COMMENT: return 36;
case HIGHLIGHT_KEYWORD1: return 33;
case HIGHLIGHT_KEYWORD2: return 32;
case HIGHLIGHT_STRING: return 35;
case HIGHLIGHT_NUMBER: return 31;
case HIGHLIGHT_MATCH: return 34;
default: return 37;
}
}
void editor_select_syntax_highlight(struct editor_state* editor)
{
editor->syntax = NULL;
if (editor->filename == NULL)
return;
char* extension = strrchr(editor->filename, '.');
for (unsigned int j = 0; j < HIGHLIGHT_DATABASE_ENTRY_COUNT; j++) {
struct editor_syntax* syntax = &highlight_database[j];
unsigned int i = 0;
while (syntax->filetype_match[i]) {
int is_extension = (syntax->filetype_match[i][0] == '.');
if ((is_extension && extension && !strcmp(extension, syntax->filetype_match[i])) || (!is_extension && strstr(editor->filename, syntax->filetype_match[i]))) {
editor->syntax = syntax;
int file_row;
for (file_row = 0; file_row < editor->row_count; file_row++) {
editor_update_syntax(editor, &editor->rows[file_row]);
}
return;
}
i++;
}
}
}
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