[gcalctool] Fix bug when entering numeric point and ans is in display

[Robin Sonefors <rsonefors src gnome org>]

commit 382a6df2c1ad86e9a204bfb5c8d574420b34933e
Author: Robin Sonefors <ozamosi flukkost nu>
Date:   Sat Oct 9 18:13:36 2010 +0200

    Fix bug when entering numeric point and ans is in display
    
    Before, if ans was 2 and you entered .2, you would get an error.
    Now, treat the numeric point like a digit and clear the display when it
    is entered if display is ans.

 src/math-equation.c |    3 ++-
 src/mp-serializer.c |    8 ++++++++
 src/mp-serializer.h |    3 ++-
 3 files changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/src/math-equation.c b/src/math-equation.c
index 6627635..0f33ab2 100644
--- a/src/math-equation.c
+++ b/src/math-equation.c
@@ -1372,7 +1372,8 @@ pre_insert_text_cb (MathEquation  *equation,
     /* Clear result on next digit entered if cursor at end of line */
     // FIXME Cursor
     c = g_utf8_get_char(text);
-    if (g_unichar_isdigit(c) && math_equation_is_result(equation)) {
+    if ((g_unichar_isdigit(c) || mp_serializer_is_numeric_point(equation->priv->serializer, text)) &&
+            math_equation_is_result(equation)) {
         gtk_text_buffer_set_text(GTK_TEXT_BUFFER(equation), "", -1);
         clear_ans(equation, FALSE);
         gtk_text_buffer_get_end_iter(GTK_TEXT_BUFFER(equation), location);
diff --git a/src/mp-serializer.c b/src/mp-serializer.c
index 8d466a0..b397a57 100644
--- a/src/mp-serializer.c
+++ b/src/mp-serializer.c
@@ -337,6 +337,14 @@ mp_serializer_get_thousands_separator_text(MpSerializer *serializer)
     return serializer->priv->tsep;
 }
 
+gboolean
+mp_serializer_is_numeric_point(MpSerializer *serializer, const char *text)
+{
+    if (*text == '.' || strncmp(text, serializer->priv->radix, strlen(serializer->priv->radix)) == 0)
+        return true;
+    return false;
+}
+
 void
 mp_serializer_set_show_thousands_separators(MpSerializer *serializer, gboolean visible)
 {
diff --git a/src/mp-serializer.h b/src/mp-serializer.h
index 3490183..f815fa2 100644
--- a/src/mp-serializer.h
+++ b/src/mp-serializer.h
@@ -54,8 +54,9 @@ void mp_serializer_to_standard_string(MpSerializer *serializer, const MPNumber *
 void mp_serializer_to_specific_string(const MPNumber *z, int base, int accuracy, bool trim_zeroes, bool localize, char *target, int target_len);
 bool mp_serializer_from_string(MpSerializer *serializer, const char *str, MPNumber *z);
 
-const gchar* mp_serializer_get_numeric_point_text(MpSerializer *serializer);
 const gchar* mp_serializer_get_thousands_separator_text(MpSerializer *serializer);
+const gchar* mp_serializer_get_numeric_point_text(MpSerializer *serializer);
+gboolean mp_serializer_is_numeric_point(MpSerializer *serializer, const char* text);
 void mp_serializer_set_base(MpSerializer *serializer, int base);
 int mp_serializer_get_base(MpSerializer *serializer);
 gboolean mp_serializer_get_show_trailing_zeroes(MpSerializer *serializer);