+Sun Aug 29 13:38:59 BST 1999 Tony Gale <gale@gtk.org>
+
+ * docs/gtkfaq.sgml: Minor FAQ Update
+
Sat Aug 28 14:34:37 BST 1999 Tony Gale <gale@gtk.org>
* docs/gtkfaq.sgml: FAQ update
+Sun Aug 29 13:38:59 BST 1999 Tony Gale <gale@gtk.org>
+
+ * docs/gtkfaq.sgml: Minor FAQ Update
+
Sat Aug 28 14:34:37 BST 1999 Tony Gale <gale@gtk.org>
* docs/gtkfaq.sgml: FAQ update
+Sun Aug 29 13:38:59 BST 1999 Tony Gale <gale@gtk.org>
+
+ * docs/gtkfaq.sgml: Minor FAQ Update
+
Sat Aug 28 14:34:37 BST 1999 Tony Gale <gale@gtk.org>
* docs/gtkfaq.sgml: FAQ update
+Sun Aug 29 13:38:59 BST 1999 Tony Gale <gale@gtk.org>
+
+ * docs/gtkfaq.sgml: Minor FAQ Update
+
Sat Aug 28 14:34:37 BST 1999 Tony Gale <gale@gtk.org>
* docs/gtkfaq.sgml: FAQ update
+Sun Aug 29 13:38:59 BST 1999 Tony Gale <gale@gtk.org>
+
+ * docs/gtkfaq.sgml: Minor FAQ Update
+
Sat Aug 28 14:34:37 BST 1999 Tony Gale <gale@gtk.org>
* docs/gtkfaq.sgml: FAQ update
+Sun Aug 29 13:38:59 BST 1999 Tony Gale <gale@gtk.org>
+
+ * docs/gtkfaq.sgml: Minor FAQ Update
+
Sat Aug 28 14:34:37 BST 1999 Tony Gale <gale@gtk.org>
* docs/gtkfaq.sgml: FAQ update
+Sun Aug 29 13:38:59 BST 1999 Tony Gale <gale@gtk.org>
+
+ * docs/gtkfaq.sgml: Minor FAQ Update
+
Sat Aug 28 14:34:37 BST 1999 Tony Gale <gale@gtk.org>
* docs/gtkfaq.sgml: FAQ update
<!-- NOTE: Use only one author tag, otherwise sgml2txt barfs - TRG -->
<author>Nathan Froyd, Tony Gale, Shawn T. Amundson, Emmanuel Deloget
-<date>August 28th 1999
+<date>August 29th 1999
<abstract> This document is intended to answer questions that are likely to be
frequently asked by programmers using GTK+ or people who are just looking at
return G_TOKEN_NONE;
}
+
int
main (int argc, char *argv[])
{
}
</verb>
+You need to understand that the scanner will parse it's input and
+tokenize it, it is up to you to interpret these tokens, not define
+their types before they get parsed, e.g. watch gscanner parse a string:
+
+<verb>
+"hi i am 17"
+ | | | |
+ | | | v
+ | | v TOKEN_INT, value: 17
+ | v TOKEN_IDENTIFIER, value: "am"
+ v TOKEN_CHAR, value: 'i'
+TOKEN_IDENTIFIER, value: "hi"
+</verb>
+
+If you configure the scanner with:
+<verb>
+scanner->config->int_2_float = TRUE;
+scanner->config->char_2_token = TRUE;
+scanner->config->scan_symbols = TRUE;
+</verb>
+
+and add "am" as a symbol with
+<verb>
+g_scanner_add_symbol (scanner, "am", "symbol value");
+</verb>
+
+GScanner will parse it as
+
+<verb>
+"hi i am 17"
+ | | | |
+ | | | v
+ | | v TOKEN_FLOAT, value: 17.0 (automatic int->float conversion)
+ | | TOKEN_SYMBOL, value: "symbol value" (a successfull hash table lookup
+ | | turned a TOKEN_IDENTIFIER into a
+ | | TOKEN_SYMBOL and took over the
+ | v symbol's value)
+ v 'i' ('i' can be a valid token as well, as all chars >0 and <256)
+TOKEN_IDENTIFIER, value: "hi"
+</verb>
+
+You need to match the token sequence with your code, and if you encounter
+something that you don't want, you error out:
+
+<verb>
+/* expect an identifier ("hi") */
+g_scanner_get_next_token (scanner);
+if (scanner->token != G_TOKEN_IDENTIFIER)
+ return G_TOKEN_IDENTIFIER;
+/* expect a token 'i' */
+g_scanner_get_next_token (scanner);
+if (scanner->token != 'i')
+ return 'i';
+/* expect a symbol ("am") */
+g_scanner_get_next_token (scanner);
+if (scanner->token != G_TOKEN_SYMBOL)
+ return G_TOKEN_SYMBOL;
+/* expect a float (17.0) */
+g_scanner_get_next_token (scanner);
+if (scanner->token != G_TOKEN_FLOAT)
+ return G_TOKEN_FLOAT;
+</verb>
+
+If you got past here, you have parsed "hi i am 17" and would have
+accepted "dooh i am 42" and "bah i am 0.75" as well, but you would
+have not accepted "hi 7 am 17" or "hi i hi 17".
+
<!-- ***************************************************************** -->
<sect>GTK+ FAQ Contributions, Maintainers and Copyright
<p>
<!-- NOTE: Use only one author tag, otherwise sgml2txt barfs - TRG -->
<author>Nathan Froyd, Tony Gale, Shawn T. Amundson, Emmanuel Deloget
-<date>August 28th 1999
+<date>August 29th 1999
<abstract> This document is intended to answer questions that are likely to be
frequently asked by programmers using GTK+ or people who are just looking at
return G_TOKEN_NONE;
}
+
int
main (int argc, char *argv[])
{
}
</verb>
+You need to understand that the scanner will parse it's input and
+tokenize it, it is up to you to interpret these tokens, not define
+their types before they get parsed, e.g. watch gscanner parse a string:
+
+<verb>
+"hi i am 17"
+ | | | |
+ | | | v
+ | | v TOKEN_INT, value: 17
+ | v TOKEN_IDENTIFIER, value: "am"
+ v TOKEN_CHAR, value: 'i'
+TOKEN_IDENTIFIER, value: "hi"
+</verb>
+
+If you configure the scanner with:
+<verb>
+scanner->config->int_2_float = TRUE;
+scanner->config->char_2_token = TRUE;
+scanner->config->scan_symbols = TRUE;
+</verb>
+
+and add "am" as a symbol with
+<verb>
+g_scanner_add_symbol (scanner, "am", "symbol value");
+</verb>
+
+GScanner will parse it as
+
+<verb>
+"hi i am 17"
+ | | | |
+ | | | v
+ | | v TOKEN_FLOAT, value: 17.0 (automatic int->float conversion)
+ | | TOKEN_SYMBOL, value: "symbol value" (a successfull hash table lookup
+ | | turned a TOKEN_IDENTIFIER into a
+ | | TOKEN_SYMBOL and took over the
+ | v symbol's value)
+ v 'i' ('i' can be a valid token as well, as all chars >0 and <256)
+TOKEN_IDENTIFIER, value: "hi"
+</verb>
+
+You need to match the token sequence with your code, and if you encounter
+something that you don't want, you error out:
+
+<verb>
+/* expect an identifier ("hi") */
+g_scanner_get_next_token (scanner);
+if (scanner->token != G_TOKEN_IDENTIFIER)
+ return G_TOKEN_IDENTIFIER;
+/* expect a token 'i' */
+g_scanner_get_next_token (scanner);
+if (scanner->token != 'i')
+ return 'i';
+/* expect a symbol ("am") */
+g_scanner_get_next_token (scanner);
+if (scanner->token != G_TOKEN_SYMBOL)
+ return G_TOKEN_SYMBOL;
+/* expect a float (17.0) */
+g_scanner_get_next_token (scanner);
+if (scanner->token != G_TOKEN_FLOAT)
+ return G_TOKEN_FLOAT;
+</verb>
+
+If you got past here, you have parsed "hi i am 17" and would have
+accepted "dooh i am 42" and "bah i am 0.75" as well, but you would
+have not accepted "hi 7 am 17" or "hi i hi 17".
+
<!-- ***************************************************************** -->
<sect>GTK+ FAQ Contributions, Maintainers and Copyright
<p>
projects / gtk4.git / commitdiff