From 682d102c88abc2161d9d309ddb8002ca5f93299b Mon Sep 17 00:00:00 2001
From: Tyrel Souza <923113+tyrelsouza@users.noreply.github.com>
Date: Sun, 24 Oct 2021 10:55:56 -0400
Subject: [PATCH] done syntax highlighting

---
 tted.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 49 insertions(+), 4 deletions(-)

diff --git a/tted.c b/tted.c
index 08c998b..ae4390b 100644
--- a/tted.c
+++ b/tted.c
@@ -38,6 +38,7 @@ enum editorKey {
 enum editorHighlight {
   HL_NORMAL = 0,
   HL_COMMENT,
+  HL_MLCOMMENT,
   HL_KEYWORD1,
   HL_KEYWORD2,
   HL_STRING,
@@ -54,15 +55,19 @@ struct editorSyntax {
   char **filematch;
   char **keywords;
   char *singleline_comment_start;
+  char *multiline_comment_start;
+  char *multiline_comment_end;
   int flags;
 };
 
 typedef struct erow {
+  int idx;
   int size;
   int rsize;
   char *chars;
   char *render;
   unsigned char *hl;
+  int hl_open_comment;
 } erow;
 
 struct editorConfig {
@@ -97,7 +102,7 @@ struct editorSyntax HLDB[] = {
     "c",
     C_HL_extensions,
     C_HL_keywords,
-    "//",
+    "//", "/*", "*/",
     HL_HIGHLIGHT_NUMBERS | HL_HIGHLIGHT_STRINGS
   },
 };
@@ -234,9 +239,12 @@ int getWindowSize(int *rows, int *cols) {
 
 int is_separator(int c){
   return isspace(c) || c == '\0' || strchr(",.()+-/*=~%<>[];\"", c) != NULL;
-
 }
 
+/*
+hello
+*/
+
 void editorUpdateSyntax(erow *row){
   row->hl = realloc(row->hl, row->rsize);
   memset(row->hl, HL_NORMAL, row->rsize);
@@ -246,23 +254,48 @@ void editorUpdateSyntax(erow *row){
   char **keywords = E.syntax->keywords;
 
   char *scs = E.syntax->singleline_comment_start;
+  char *mcs = E.syntax->multiline_comment_start;
+  char *mce = E.syntax->multiline_comment_end;
+
   int scs_len = scs ? strlen(scs) : 0;
+  int mcs_len = mcs ? strlen(mcs) : 0;
+  int mce_len = mce ? strlen(mce) : 0;
 
   int prev_sep = 1;
   int in_string = 0;
+  int in_comment = (row->idx > 0 && E.row[row->idx - 1].hl_open_comment);
 
   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 (scs_len && !in_string){
+    if (scs_len && !in_string && !in_comment){
       if (!strncmp(&row->render[i], scs, scs_len)) {
         memset(&row->hl[i], HL_COMMENT, row->rsize - i);
         break;
       }
     }
-
+    if (mcs_len && mce_len && !in_string) {
+      if (in_comment) {
+        row->hl[i] = HL_MLCOMMENT;
+        if (!strncmp(&row->render[i], mce, mce_len)) {
+          memset(&row->hl[i], HL_MLCOMMENT, mce_len);
+          i += mce_len;
+          in_comment = 0;
+          prev_sep = 1;
+          continue;
+        } else {
+          i++;
+          continue;
+        }
+      } else if (!strncmp(&row->render[i], mcs, mcs_len)) {
+        memset(&row->hl[i], HL_MLCOMMENT, mcs_len);
+        i += mcs_len;
+        in_comment = 1;
+        continue;
+      }
+    }
     if (E.syntax->flags & HL_HIGHLIGHT_STRINGS) {
       if (in_string) {
         row->hl[i] = HL_STRING;
@@ -320,10 +353,17 @@ void editorUpdateSyntax(erow *row){
     prev_sep = is_separator(c);
     i++;
   }
+
+  int changed = (row->hl_open_comment != in_comment);
+  row->hl_open_comment = in_comment;
+  if (changed && row->idx + 1< E.numrows){
+    editorUpdateSyntax(&E.row[row->idx+1]);
+  }
 }
 
 int editorSyntaxToColor(int hl){
   switch(hl){
+    case HL_MLCOMMENT:
     case HL_COMMENT: return 36;
     case HL_KEYWORD1: return 33;
     case HL_KEYWORD2: return 32;
@@ -418,6 +458,9 @@ void editorInsertRow(int at, char *s, size_t len) {
   if (at < 0 || at > E.numrows) return;
   E.row = realloc(E.row, sizeof(erow) * (E.numrows + 1));
   memmove(&E.row[at +1], &E.row[at], sizeof(erow) * (E.numrows-at));
+  for (int j = at + 1; j <= E.numrows; j++) E.row[j].idx++;
+
+  E.row[at].idx = at;
 
   E.row[at].size = len;
   E.row[at].chars = malloc(len + 1);
@@ -426,6 +469,7 @@ void editorInsertRow(int at, char *s, size_t len) {
   E.row[at].rsize = 0;
   E.row[at].render = NULL;
   E.row[at].hl = NULL;
+  E.row[at].hl_open_comment = 0;
   editorUpdateRow(&E.row[at]);
   E.numrows++;
   E.dirty++;
@@ -442,6 +486,7 @@ void editorDelRow(int at) {
 
   editorFreeRow(&E.row[at]);
   memmove(&E.row[at], &E.row[at + 1], sizeof(erow) * (E.numrows - at - 1));
+  for (int j = at; j = E.numrows -1; j++) E.row[j].idx--;
   E.numrows--;
   E.dirty++;
 }