[vile] C# verbatim string literals

[Rick Sladkey]

This patch adds support for C# verbatim string literals:

diff -ru orig/vile-9.7ze/filters/c-filt.c vile-9.7ze/filters/c-filt.c
--- orig/vile-9.7ze/filters/c-filt.c    2010-05-03 20:47:41.000000000 -0400
+++ vile-9.7ze/filters/c-filt.c 2010-06-14 11:59:19.909444400 -0400
@@ -15,11 +15,12 @@
  *     -o      objc has '@' directives
  *     -p      suppress preprocessor support
  *     -s      javascript special cases
+ *     -#      C# special cases
  */
 
 #include <filters.h>
 
-DefineOptFilter("c", "jops");
+DefineOptFilter("c", "jops#");
 
 #define UPPER(c) isalpha(CharOf(c)) ? toupper(CharOf(c)) : c
 
@@ -88,13 +89,19 @@
 }
 
 static int
-has_endofliteral(char *s, int delim)
+has_endofliteral(char *s, int delim, int verbatim)
 {                              /* points to '"' */
     int i = 0;
     while (*s) {
-       if (*s == delim)
-           return (i);
-       if (s[0] == BACKSLASH && (s[1] == delim || s[1] == BACKSLASH)) {
+       if (*s == delim) {
+           if (verbatim && s[1] == delim) {
+               ++i;
+               ++s;
+           } else {
+               return (i);
+           }
+       }
+       if (!verbatim && s[0] == BACKSLASH && (s[1] == delim || s[1] == 
BACKSLASH)) {
            ++i;
            ++s;
        }
@@ -306,22 +313,24 @@
 }
 
 static char *
-write_literal(char *s, int *literal, int escaped)
+write_literal(char *s, int *literal, int *verbatim, int escaped)
 {
-    int c_length = has_endofliteral(s, *literal);
+    int c_length = has_endofliteral(s, *literal, *verbatim);
     if (c_length < 0)
        c_length = (int) strlen(s);
     else
        *literal = 0;
-    if (escaped) {
+    if (escaped || *verbatim) {
        flt_puts(s, c_length, Literal_attr);
     } else {
        flt_error("expected an escape");
        flt_puts(s, c_length, Error_attr);
     }
     s += c_length;
-    if (!*literal)
+    if (!*literal) {
        flt_putc(*s++);
+       *verbatim = 0;
+    }
     return s;
 }
 
@@ -459,6 +468,7 @@
     int comment;
     int escaped;
     int literal;
+    int verbatim;
     int was_eql;
     int was_esc;
     unsigned len;
@@ -474,6 +484,7 @@
 
     comment = 0;
     literal = 0;
+    verbatim = 0;
     was_eql = 0;
     was_esc = 0;
 
@@ -482,7 +493,7 @@
        was_esc = 0;
        s = line;
        if (literal)
-           s = write_literal(s, &literal, escaped);
+           s = write_literal(s, &literal, &verbatim, escaped);
        s = skip_white(s);
        while (*s) {
            if (!comment && *s == '/' && *(s + 1) == '*') {
@@ -531,11 +542,14 @@
                    s = write_escape(s, Error_attr);
                }
                was_eql = 0;
+           } else if (FltOptions('#') && *s == '@' && s[1] == DQUOTE) {
+               verbatim = 1;
+               flt_putc(*s++);
            } else if (isQuote(*s)) {
                literal = (literal == 0) ? *s : 0;
                flt_putc(*s++);
                if (literal) {
-                   s = write_literal(s, &literal, 1);
+                   s = write_literal(s, &literal, &verbatim, 1);
                }
                was_eql = 0;
            } else if (isIdent(*s)) {
diff -ru orig/vile-9.7ze/filters/filters.rc vile-9.7ze/filters/filters.rc
--- orig/vile-9.7ze/filters/filters.rc  2009-06-20 08:10:32.000000000 -0400
+++ vile-9.7ze/filters/filters.rc       2010-06-14 00:23:34.356328700 -0400
@@ -28,7 +28,7 @@
 
 define-mode cs
 ~with define-submode cs
-       filtername      'vile-c-filt -k cs'
+       filtername      'vile-c-filt -# -k cs'
 ~endwith
 
 define-mode csh