[vte/wip/html: 12/425] Identify spans of equal attributes

[Christian Persch <chpe src gnome org>]

commit 612a9b47ac16208ee2b91a874ade73681e340460
Author: Joachim Breitner <mail joachim-breitner de>
Date:   Wed Jul 20 23:37:32 2011 +0200

    Identify spans of equal attributes
    
    This works with VteCharAttributes, which unfortunately do not carry the
    information we want (boldness etc.). Therefore, this is going to be
    refactored further.

 src/vte.c |   52 ++++++++++++++++++++++++++++++++++++++++++++++++----
 1 files changed, 48 insertions(+), 4 deletions(-)
---
diff --git a/src/vte.c b/src/vte.c
index 9f787d5..b7f27a2 100644
--- a/src/vte.c
+++ b/src/vte.c
@@ -6523,11 +6523,19 @@ vte_terminal_get_text_include_trailing_spaces(VteTerminal *terminal,
                                                   TRUE);
 }
 
+static gboolean
+vte_terminal_attributes_equal(const VteCharAttributes *attr1, const VteCharAttributes *attr2) {
+       return (gdk_color_equal(&attr1->fore, &attr2->fore) &&
+               gdk_color_equal(&attr1->back, &attr2->back) &&
+               attr1->underline     == attr2->underline  &&
+               attr1->strikethrough == attr2->strikethrough);
+}
+
 /**
  * vte_terminal_attributes_to_html:
  * @terminal: a #VteTerminal
  * @text: A string as returned by the vte_terminal_get_* family of functions.
- * @attributes: (array) (element-type Vte.CharAttributes): text attributes, as created by vte_terminal_get_*
+ * @attrs: (array) (element-type Vte.CharAttributes): text attributes, as created by vte_terminal_get_*
  *
  * Marks the given text up according to the given attributes, using HTML <span>
  * commands, and wraps the string in a <pre> element.
@@ -6535,9 +6543,45 @@ vte_terminal_get_text_include_trailing_spaces(VteTerminal *terminal,
  * Returns: (transfer full): a newly allocated text string, or %NULL.
  */
 char *
-vte_terminal_attributes_to_html(VteTerminal *terminal, const gchar *text, GArray *attributes) {
-       g_assert(strlen(text) == attributes->len);
-       return g_markup_printf_escaped("<pre>%s</pre>", text);
+vte_terminal_attributes_to_html(VteTerminal *terminal, const gchar *text, GArray *attrs) {
+       GString *string;
+       guint from,to;
+       VteCharAttributes attr;
+       char *escaped;
+
+       g_assert(strlen(text) == attrs->len);
+
+       // Initial size fits perfectly if the text has no attributes and no
+       // characters that need to be escaped
+       string = g_string_sized_new (strlen(text) + 11);
+       
+       g_string_append(string, "<pre>");
+       // Find streches with equal attributes. Newlines are treated specially,
+       // so that the <span> do not cover multiple lines.
+       from = to = 0;
+       while (text[from] != '\0') {
+               g_assert(from == to);
+               if (text[from] == '\n') {
+                       g_string_append_c(string, '\n');
+                       from = ++to;
+               } else {
+                       attr = g_array_index (attrs, VteCharAttributes, from);
+                       while (text[to] != '\0' && text[to] != '\n' &&
+                              vte_terminal_attributes_equal(&attr,
+                                       &g_array_index(attrs, VteCharAttributes, to))) {
+                               to++;
+                       }
+                       escaped = g_markup_escape_text(text + from, to - from);
+                       g_string_append(string, "<span>");
+                       g_string_append(string, escaped);
+                       g_string_append(string, "</span>");
+                       g_free(escaped);
+                       from = to;
+               }
+       }
+       g_string_append(string, "</pre>");
+
+       return g_string_free(string, FALSE);
 }
 
 /**