Syntax highlight strings.

editor.c

@@ -24,6 +24,7 @@
 #define EDITOR_TAB 8
 #define EDITOR_QUIT_TIMES 1
 #define HL_HIGHLIGHT_NUMBERS (1<<0)
+#define HL_HIGHLIGHT_STRINGS (1<<1)
 
 enum editorKey {
     BACKSPACE = 127,
@@ -39,9 +40,10 @@ enum editorKey {
 };
 
 enum editorHighlight {
-  HL_NORMAL = 0,
-  HL_NUMBER,
-  HL_MATCH
+    HL_NORMAL = 0,
+    HL_STRING,
+    HL_NUMBER,
+    HL_MATCH
 };
 
 /*** data ***/
@@ -85,7 +87,7 @@ struct editorSyntax HLDB[] = {
     {
         "c",
         C_HL_extensions,
-        HL_HIGHLIGHT_NUMBERS
+        HL_HIGHLIGHT_NUMBERS | HL_HIGHLIGHT_STRINGS
     },
 };
 
@@ -249,11 +251,37 @@ void editorUpdateSyntax(editorrow *row) {
     if (E.syntax == NULL) return;
 
     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 (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)) {
@@ -275,6 +303,8 @@ int editorSyntaxToColor(int hl) {
             return 32;
         case HL_MATCH: // search query match
             return 31;
+        case HL_STRING: 
+            return 33;
         default: 
             return 37;
     }