diff -r adc06e9e8470 -r aece0899b1d3 bookloupe/counters.c
--- a/bookloupe/counters.c	Mon Sep 23 21:18:27 2013 +0100
+++ b/bookloupe/counters.c	Wed Oct 30 17:21:21 2013 +0000
@@ -8,6 +8,14 @@
     int open,close;
 };
 
+GQuark counters_error_quark(void)
+{
+    static GQuark quark;
+    if (!quark)
+	quark=g_quark_from_static_string("counters_error");
+    return quark;
+}
+
 static struct matching_counter *matching_counter_new(void)
 {
     return g_slice_new0(struct matching_counter);
@@ -45,11 +53,64 @@
 	return GINT_TO_POINTER((gint)CHAR_SQUOTE);
     else if (ch==CHAR_LS_QUOTE || ch==CHAR_RS_QUOTE)
 	return GINT_TO_POINTER((gint)CHAR_LS_QUOTE);
+    else if (ch==CHAR_LD_QUOTE || ch==CHAR_RD_QUOTE)
+	return GINT_TO_POINTER((gint)CHAR_LD_QUOTE);
+    else if (ch==CHAR_DQUOTE)
+	return GINT_TO_POINTER((gint)ch);
     else if (ch<0x4000 || ch-0x4000>=NO_SPECIAL_COUNTERS)
+	g_warning("Matching pair not found for U+%04" G_GINT32_MODIFIER "X",ch);
+    return GINT_TO_POINTER((gint)ch);
+}
+
+gboolean innermost_quote_matches(struct counters *counters,gunichar ch)
+{
+    gpointer head;
+    if (counters->open_quotes)
+	head=counters->open_quotes->data;
+    else
+	head=NULL;
+    return head==matching_key(ch);
+}
+
+gboolean count_quote(struct counters *counters,gunichar ch,QuoteClass klass,
+  GError **err)
+{
+    gboolean retval=TRUE;
+    gpointer head;
+    if (counters->open_quotes)
+	head=counters->open_quotes->data;
+    else
+	head=NULL;
+    switch(klass)
     {
-	g_warning("Matching pair not found for U+%04" G_GINT32_MODIFIER "X",ch);
-	return GINT_TO_POINTER((gint)ch);
+	case NEUTRAL_QUOTE:
+	    if (head!=matching_key(ch))
+		goto opening;
+	    /* else fall through */
+	case CLOSING_QUOTE:
+	    if (head!=matching_key(ch))
+	    {
+		g_set_error(err,COUNTERS_ERROR,COUNTERS_ERROR_FAILED,
+		  "Closing quotation mark with no matching open?");
+		retval=FALSE;
+	    }
+	    else
+		counters->open_quotes=g_slist_delete_link(counters->open_quotes,
+		  counters->open_quotes);
+	    break;
+	case OPENING_QUOTE:
+	    if (head==matching_key(ch))
+	    {
+		g_set_error(err,COUNTERS_ERROR,COUNTERS_ERROR_FAILED,
+		  "Directly nested quotation marks of same type?");
+		retval=FALSE;
+	    }
+opening:
+	    head=matching_key(ch);
+	    counters->open_quotes=g_slist_prepend(counters->open_quotes,head);
+	    break;
     }
+    return retval;
 }
 
 void increment_matching(struct counters *counters,gunichar ch,gboolean open)