It's the worlds ugliest highlighting code!!!! The result is okay so long
Thu May 17 16:20:04 2001 Jonathan Blandford <jrb@redhat.com> * demos/gtk-demo/main.c (fontify): It's the worlds ugliest highlighting code!!!! The result is okay so long as you don't try to stress it. It also highlights a bug in the TextView so it's in an unproportional font right now until it's fixed. *demos/gtk-demo/*.c: Clean up code a bit to make it ugly-parser(TM) friendly. (-:
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Jonathan Blandford
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Jonathan Blandford
Jonathan Blandford
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288ff7e058
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009212ad28
@ -93,6 +93,271 @@ read_line (FILE *stream, GString *str)
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return n_read > 0;
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}
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/* Stupid syntax highlighting.
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*
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* No regex was used in the making of this highlighting.
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* It should only work for simple cases. This is good, as
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* that's all we should have in the demos.
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*/
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/* This code should not be used elsewhere, except perhaps as an example of how
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* to iterate through a text buffer.
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*/
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enum {
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STATE_NORMAL,
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STATE_IN_COMMENT,
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};
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static gchar *tokens[] =
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{
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"/*",
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"\"",
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NULL
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};
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static gchar *types[] =
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{
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"static",
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"const ",
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"void",
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"gint",
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"int ",
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"char ",
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"gchar ",
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"gfloat",
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"float",
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"gint8",
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"gint16",
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"gint32",
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"guint",
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"guint8",
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"guint16",
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"guint32",
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"guchar",
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"glong",
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"gboolean" ,
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"gshort",
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"gushort",
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"gulong",
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"gdouble",
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"gldouble",
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"gpointer",
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"NULL",
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"GList",
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"GSList",
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"FALSE",
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"TRUE",
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"FILE ",
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"GtkObject ",
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"GtkColorSelection ",
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"GtkWidget ",
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"GtkButton ",
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"GdkColor ",
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"GdkRectangle ",
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"GdkEventExpose ",
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"GdkGC ",
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"GdkPixbufLoader ",
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"GdkPixbuf ",
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"GError",
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"size_t",
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NULL
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};
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static gchar *control[] =
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{
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" if ",
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" while ",
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" else",
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" do ",
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" for ",
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"?",
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":",
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"return ",
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"goto ",
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NULL
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};
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void
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parse_chars (gchar *text,
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gchar **end_ptr,
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gint *state,
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gchar **tag,
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gboolean start)
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{
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gint i;
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gchar *next_token;
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/* Handle comments first */
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if (*state == STATE_IN_COMMENT)
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{
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*end_ptr = strstr (text, "*/");
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if (*end_ptr)
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{
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*end_ptr += 2;
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*state = STATE_NORMAL;
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*tag = "comment";
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}
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return;
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}
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*tag = NULL;
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*end_ptr = NULL;
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/* check for comment */
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if (!strncmp (text, "/*", 2))
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{
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*end_ptr = strstr (text, "*/");
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if (*end_ptr)
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*end_ptr += 2;
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else
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*state = STATE_IN_COMMENT;
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*tag = "comment";
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return;
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}
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/* check for preprocessor defines */
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if (*text == '#' && start)
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{
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*end_ptr = NULL;
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*tag = "preprocessor";
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return;
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}
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/* functions */
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if (start && * text != '\t' && *text != ' ' && *text != '{' && *text != '}')
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{
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if (strstr (text, "("))
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{
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*end_ptr = strstr (text, "(");
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*tag = "function";
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return;
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}
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}
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/* check for types */
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for (i = 0; types[i] != NULL; i++)
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if (!strncmp (text, types[i], strlen (types[i])))
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{
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*end_ptr = text + strlen (types[i]);
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*tag = "type";
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return;
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}
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/* check for control */
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for (i = 0; control[i] != NULL; i++)
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if (!strncmp (text, control[i], strlen (control[i])))
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{
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*end_ptr = text + strlen (control[i]);
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*tag = "control";
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return;
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}
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/* check for string */
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if (text[0] == '"')
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{
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gint maybe_escape = FALSE;
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*end_ptr = text + 1;
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*tag = "string";
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while (**end_ptr != '\000')
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{
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if (**end_ptr == '\"' && !maybe_escape)
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{
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*end_ptr += 1;
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return;
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}
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if (**end_ptr == '\\')
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maybe_escape = TRUE;
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else
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maybe_escape = FALSE;
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*end_ptr += 1;
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}
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return;
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}
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/* not at the start of a tag. Find the next one. */
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for (i = 0; tokens[i] != NULL; i++)
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{
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next_token = strstr (text, tokens[i]);
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if (next_token)
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{
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if (*end_ptr)
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*end_ptr = (*end_ptr<next_token)?*end_ptr:next_token;
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else
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*end_ptr = next_token;
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}
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}
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for (i = 0; types[i] != NULL; i++)
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{
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next_token = strstr (text, types[i]);
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if (next_token)
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{
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if (*end_ptr)
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*end_ptr = (*end_ptr<next_token)?*end_ptr:next_token;
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else
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*end_ptr = next_token;
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}
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}
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for (i = 0; control[i] != NULL; i++)
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{
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next_token = strstr (text, control[i]);
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if (next_token)
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{
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if (*end_ptr)
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*end_ptr = (*end_ptr<next_token)?*end_ptr:next_token;
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else
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*end_ptr = next_token;
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}
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}
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}
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/* While not as cool as c-mode, this will do as a quick attempt at highlighting */
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static void
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fontify ()
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{
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GtkTextIter start_iter, next_iter, tmp_iter;
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gint state;
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gchar *text;
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gchar *start_ptr, *end_ptr;
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gchar *tag;
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state = STATE_NORMAL;
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gtk_text_buffer_get_iter_at_offset (source_buffer, &start_iter, 0);
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next_iter = start_iter;
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while (gtk_text_iter_forward_line (&next_iter))
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{
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gboolean start = TRUE;
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start_ptr = text = gtk_text_iter_get_text (&start_iter, &next_iter);
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do
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{
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parse_chars (start_ptr, &end_ptr, &state, &tag, start);
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start = FALSE;
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if (end_ptr)
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{
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tmp_iter = start_iter;
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gtk_text_iter_forward_chars (&tmp_iter, end_ptr - start_ptr);
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}
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else
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{
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tmp_iter = next_iter;
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}
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if (tag)
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gtk_text_buffer_apply_tag_by_name (info_buffer, tag, &start_iter, &tmp_iter);
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start_iter = tmp_iter;
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start_ptr = end_ptr;
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}
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while (end_ptr);
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g_free (text);
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start_iter = next_iter;
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}
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}
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void
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load_file (const gchar *filename)
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{
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@ -230,8 +495,7 @@ load_file (const gchar *filename)
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}
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}
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gtk_text_buffer_get_bounds (source_buffer, &start, &end);
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gtk_text_buffer_apply_tag_by_name (info_buffer, "source", &start, &end);
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fontify ();
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g_string_free (buffer, TRUE);
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}
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@ -381,7 +645,7 @@ create_text (GtkTextBuffer **buffer,
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if (is_source)
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{
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font_desc = pango_font_description_from_string ("Courier 10");
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font_desc = pango_font_description_from_string ("Courier 14");
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gtk_widget_modify_font (text_view, font_desc);
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pango_font_description_free (font_desc);
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@ -505,10 +769,26 @@ main (int argc, char **argv)
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"font", "Sans 18",
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NULL);
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tag = gtk_text_buffer_create_tag (info_buffer, "source",
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"font", "Courier 10",
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"pixels_above_lines", 0,
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"pixels_below_lines", 0,
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tag = gtk_text_buffer_create_tag (info_buffer, "comment",
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"foreground", "blue",
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NULL);
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tag = gtk_text_buffer_create_tag (info_buffer, "type",
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"foreground", "red",
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NULL);
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tag = gtk_text_buffer_create_tag (info_buffer, "string",
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"foreground", "SpringGreen3",
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"weight", PANGO_WEIGHT_BOLD,
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NULL);
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tag = gtk_text_buffer_create_tag (info_buffer, "control",
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"foreground", "purple",
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NULL);
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tag = gtk_text_buffer_create_tag (info_buffer, "preprocessor",
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"style", PANGO_STYLE_OBLIQUE,
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"foreground", "burlywood4",
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NULL);
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tag = gtk_text_buffer_create_tag (info_buffer, "function",
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"weight", PANGO_WEIGHT_BOLD,
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"foreground", "DarkGoldenrod4",
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NULL);
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gtk_window_set_default_size (GTK_WINDOW (window), 600, 400);
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