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syntax highlighting parts

This commit is contained in:
Tyrel Souza 2021-10-23 00:53:02 -04:00
parent f03f084d72
commit ef959b69be
2 changed files with 148 additions and 11 deletions
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3
README.md
View File

@ -1,4 +1,5 @@
Tyrel's Text Editor
next:
https://viewsourcecode.org/snaptoken/kilo/07.syntaxHighlighting.html
https://viewsourcecode.org/snaptoken/kilo/07.syntaxHighlighting.html#colorful-multiline-comments

156
tted.c
View File

@ -37,17 +37,23 @@ enum editorKey {
enum editorHighlight {
HL_NORMAL = 0,
HL_COMMENT,
HL_KEYWORD1,
HL_KEYWORD2,
HL_STRING,
HL_NUMBER,
HL_MATCH
};
#define HL_HIGHLIGHT_NUMBERS (1<<0)
#define HL_HIGHLIGHT_STRINGS (1<<1)
/** data */
struct editorSyntax {
char *filetype;
char **filematch;
char **keywords;
char *singleline_comment_start;
int flags;
};
@ -72,10 +78,33 @@ struct editorConfig {
char *filename;
char statusmsg[80];
time_t statusmsg_time;
struct editorSyntax *syntax;
struct termios orig_termios;
};
struct editorConfig E;
/** filetypes */
char *C_HL_extensions[] = {".c", ".h", ".cpp", NULL};
char *C_HL_keywords[] = {
"switch", "if", "while", "for", "break", "continue", "return", "else",
"struct", "union", "typedef", "static", "enum", "class", "case",
"int|", "long|", "double|", "float|", "char|", "unsigned|", "signed|",
"void|", NULL
};
struct editorSyntax HLDB[] = {
{
"c",
C_HL_extensions,
C_HL_keywords,
"//",
HL_HIGHLIGHT_NUMBERS | HL_HIGHLIGHT_STRINGS
},
};
#define HLDB_ENTRIES (sizeof(HLDB) / sizeof(HLDB[0]))
/** prototypes */
void editorSetStatusMessage(const char *fmt, ...);
void editorRefreshScreen();
@ -99,7 +128,7 @@ void disableRawMode() {
void enableRawMode() {
if (tcgetattr(STDIN_FILENO, &E.orig_termios) == -1) die("tcgetattr");
atexit(disableRawMode);
atexit(disableRawMode); // run on exit
struct termios raw = E.orig_termios;
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
@ -212,19 +241,80 @@ void editorUpdateSyntax(erow *row){
row->hl = realloc(row->hl, row->rsize);
memset(row->hl, HL_NORMAL, row->rsize);
if (E.syntax == NULL) return;
char **keywords = E.syntax->keywords;
char *scs = E.syntax->singleline_comment_start;
int scs_len = scs ? strlen(scs) : 0;
int prev_sep = 1;
int in_string = 0;
int i = 0;
while(i < row->rsize){
char c = row->render[i];
unsigned char prev_hl = (i>0) ? row->hl[i-1] : HL_NORMAL;
if ((isdigit(c) && (prev_sep || prev_hl == HL_NUMBER))||
(c == '.' && prev_hl == HL_NUMBER)){
row->hl[i] = HL_NUMBER;
i++;
prev_sep = 0;
continue;
if (scs_len && !in_string){
if (!strncmp(&row->render[i], scs, scs_len)) {
memset(&row->hl[i], HL_COMMENT, row->rsize - i);
break;
}
}
if (E.syntax->flags & HL_HIGHLIGHT_STRINGS) {
if (in_string) {
row->hl[i] = HL_STRING;
if (c == '\\' && i + 1 < row->rsize){
row->hl[i+1] = HL_STRING;
i+=2;
continue;
}
if (c == in_string) in_string = 0;
i++;
prev_sep = 1;
continue;
} else {
if (c == '"' || c == '\'') {
in_string = c;
row->hl[i] = HL_STRING;
i++;
continue;
}
}
}
if (E.syntax->flags & HL_HIGHLIGHT_NUMBERS) {
if ((isdigit(c) && (prev_sep || prev_hl == HL_NUMBER))||
(c == '.' && prev_hl == HL_NUMBER)){
row->hl[i] = HL_NUMBER;
i++;
prev_sep = 0;
continue;
}
}
if (prev_sep) {
int j;
for (j=0; keywords[j]; j++){
int klen = strlen(keywords[j]);
int kw2 = keywords[j][klen - 1] == '|';
if (kw2) klen--;
if (!strncmp(&row->render[i], keywords[j], klen) &&
is_separator(row->render[i + klen])){
memset(&row->hl[i], kw2 ? HL_KEYWORD2 : HL_KEYWORD1, klen);
i += klen;
break;
}
}
if (keywords[j] != NULL){
prev_sep = 0;
continue;
}
}
prev_sep = is_separator(c);
@ -234,12 +324,42 @@ void editorUpdateSyntax(erow *row){
int editorSyntaxToColor(int hl){
switch(hl){
case HL_COMMENT: return 36;
case HL_KEYWORD1: return 33;
case HL_KEYWORD2: return 32;
case HL_NUMBER: return 31;
case HL_STRING: return 35;
case HL_MATCH: return 34;
default: return 37;
}
}
void editorSelectSyntaxHighlight() {
E.syntax = NULL;
if (E.filename == NULL) return;
char *ext = strrchr(E.filename, '.');
for (unsigned int j = 0; j < HLDB_ENTRIES; j++){
struct editorSyntax *s = &HLDB[j];
unsigned int i = 0;
while (s->filematch[i]) {
int is_ext = (s->filematch[i][0] == '.');
if ((is_ext && ext && !strcmp(ext, s->filematch[i])) ||
(!is_ext && strstr(E.filename, s->filematch[i]))) {
E.syntax = s;
int filerow;
for (filerow = 0; filerow < E.numrows; filerow++){
editorUpdateSyntax(&E.row[filerow]);
}
return;
}
i++;
}
}
}
/** row operations */
int editorRowCxToRx(erow *row, int cx) {
int rx = 0;
@ -419,6 +539,9 @@ char *editorRowsToString(int *buflen) {
void editorOpen(char *filename) {
free(E.filename);
E.filename = strdup(filename);
editorSelectSyntaxHighlight();
FILE *fp = fopen(filename, "r");
if (!fp) die("fopen");
@ -444,6 +567,7 @@ void editorSave() {
editorSetStatusMessage("Save aborted");
return;
}
editorSelectSyntaxHighlight();
}
int len;
@ -615,7 +739,17 @@ void editorDrawRows(struct abuf *ab) {
int current_color = -1;
int j;
for (j=0;j< len;j++){
if (hl[j] == HL_NORMAL){
if (iscntrl(c[j])){
char sym = (c[j] <= 26) ? '@' + c[j] : '?';
abAppend(ab, "\x1b[7m", 4);
abAppend(ab, &sym, 1);
abAppend(ab, "\x1b[m", 3);
if (current_color != -1){
char buf[16];
int clen = snprintf(buf, sizeof(buf), "\x1b[%dm", current_color);
abAppend(ab, buf, clen);
}
} else if (hl[j] == HL_NORMAL){
if (current_color != -1){
abAppend(ab, "\x1b[39m", 5);
current_color = -1;
@ -646,7 +780,8 @@ void editorDrawStatusBar(struct abuf *ab) {
int len = snprintf(status, sizeof(status), "%.20s - %d lines %s",
E.filename ? E.filename : "[No Name]", E.numrows,
E.dirty ? "(modified)" : "");
int rlen = snprintf(rstatus, sizeof(rstatus), "%d/%d", E.cy + 1, E.numrows);
int rlen = snprintf(rstatus, sizeof(rstatus), "%s | %d/%d",
E.syntax ? E.syntax->filetype : "no ft", E.cy + 1, E.numrows);
if (len > E.screencols) len = E.screencols;
abAppend(ab, status, len);
while (len < E.screencols) {
@ -870,6 +1005,7 @@ void initEditor() {
E.filename = NULL;
E.statusmsg[0] = '\0';
E.statusmsg_time = 0;
E.syntax = NULL;
if (getWindowSize(&E.screenrows, &E.screencols) == -1) die("getWindowSize");
E.screenrows -= 2;