naive <button> support

Referred: http://www.sic.med.tohoku.ac.jp/~satodai/w3m-dev/200010.month/1195.html

TODO

- nextA, prevA, nextX, and nextY aren't handled properly.
- I couldn't understand the referred patch...
- bad html handling (e.g., missing </button> and <button type="checkbox">)

file.c

@@ -58,6 +58,8 @@ static Str cur_title;
 static Str cur_select;
 static Str select_str;
 static int select_is_multiple;
+
+static Str button_type;
 static int n_selectitem;
 static Str cur_option;
 static Str cur_option_value;
@@ -3704,6 +3706,51 @@ process_input(struct parsed_tag *tag)
     return tmp;
 }
 
+Str
+process_button(struct parsed_tag *tag)
+{
+    int v;
+    char *q = "", *p = "submit", *r = "", *t;
+    Str tmp;
+    char *button_value, *button_name;
+    parsedtag_get_value(tag, ATTR_TYPE, &p);
+    parsedtag_get_value(tag, ATTR_VALUE, &q);
+    parsedtag_get_value(tag, ATTR_NAME, &r);
+    v = formtype(p);
+    if (v == FORM_UNKNOWN)
+	return NULL;
+    button_type = Strnew_charp(p);
+    button_value = html_quote(q);
+    button_name = html_quote(r);
+
+    if (cur_form_id < 0) {
+	char *s = "<form_int method=internal action=none>";
+	tmp = process_form(parse_tag(&s, TRUE));
+    }
+    if (tmp == NULL)
+	tmp = Strnew();
+
+    Strcat(tmp, Sprintf("<pre_int><input_alt hseq=\"%d\" fid=\"%d\" type=%s "
+			"name=\"%s\" value=\"%s\">",
+			cur_hseq++, cur_form_id,
+			button_type->ptr, button_name, button_value));
+
+    return tmp;
+}
+
+Str
+process_n_button(void)
+{
+    Str tmp = NULL;
+
+    if (button_type == NULL)
+	return NULL;
+
+    tmp = Strnew_charp("</input_alt></pre_int>");
+    button_type = NULL;
+    return tmp;
+}
+
 Str
 process_select(struct parsed_tag *tag)
 {
@@ -4918,6 +4965,9 @@ HTMLtagproc1(struct parsed_tag *tag, struct html_feed_environ *h_env)
 	return 1;
     case HTML_N_FORM:
 	CLOSE_A;
+	tmp = process_n_button();
+	if (tmp)
+	    HTMLlineproc1(tmp->ptr, h_env);
 	flushline(h_env, obuf, envs[h_env->envc].indent, 0, h_env->limit);
 	obuf->flag |= RB_IGNORE_P;
 	process_n_form();
@@ -4928,6 +4978,17 @@ HTMLtagproc1(struct parsed_tag *tag, struct html_feed_environ *h_env)
 	if (tmp)
 	    HTMLlineproc1(tmp->ptr, h_env);
 	return 1;
+    case HTML_BUTTON:
+	close_anchor(h_env, obuf);
+	tmp = process_button(tag);
+	if (tmp)
+	    HTMLlineproc1(tmp->ptr, h_env);
+	return 1;
+    case HTML_N_BUTTON:
+	tmp = process_n_button();
+	if (tmp)
+	    HTMLlineproc1(tmp->ptr, h_env);
+	return 1;
     case HTML_SELECT:
 	close_anchor(h_env, obuf);
 	tmp = process_select(tag);
@@ -6912,6 +6973,7 @@ loadHTMLstream(URLFile *f, Buffer *newBuf, FILE * src, int internal)
     forms_size = 0;
     forms = NULL;
     cur_hseq = 1;
+    button_type = NULL;
 #ifdef USE_IMAGE
     cur_iseq = 1;
     if (newBuf->image_flag)

html.c

@@ -56,6 +56,9 @@ unsigned char ALST_INPUT[] =
     ATTR_CORE
 };
 #define MAXA_INPUT      MAXA_CORE + 12
+unsigned char ALST_BUTTON[] =
+    { ATTR_TYPE, ATTR_VALUE, ATTR_NAME, ATTR_CORE };
+#define MAXA_BUTTON     MAXA_CORE + 3
 unsigned char ALST_TEXTAREA[] =
     { ATTR_COLS, ATTR_ROWS, ATTR_NAME, ATTR_READONLY, ATTR_CORE };
 #define MAXA_TEXTAREA   MAXA_CORE + 4
@@ -88,7 +91,6 @@ unsigned char ALST_APPLET[] = { ATTR_ARCHIVE, ATTR_CORE };
 #define MAX_APPLET	MAXA_CORE + 1
 unsigned char ALST_EMBED[] = { ATTR_SRC, ATTR_CORE };
 #define MAX_EMBED	MAXA_CORE + 1
-
 unsigned char ALST_IFRAME[] = { ATTR_SRC, ATTR_CORE };
 #define MAXA_IFRAME	MAXA_CORE + 1
 
@@ -240,8 +242,8 @@ TagInfo TagMAP[MAX_HTMLTAG] = {
     {"/strong", NULL, 0, TFLG_END},	/* 112 HTML_N_STRONG */
     {"iframe", ALST_IFRAME, MAXA_IFRAME, 0},     /*  113 HTML_IFRAME */
     {"/iframe", NULL, 0, TFLG_END}, /* 114 HTML_N_IFRAME */
-    {NULL, NULL, 0, 0},		/* 115 Undefined       */
-    {NULL, NULL, 0, 0},		/* 116 Undefined       */
+    {"button", ALST_BUTTON, MAXA_BUTTON, 0},	/* 115 HTML_BUTTON */
+    {"/button", NULL, 0, TFLG_END},	/* 116 HTML_N_BUTTON */
     {NULL, NULL, 0, 0},		/* 117 Undefined       */
     {NULL, NULL, 0, 0},		/* 118 Undefined       */
     {NULL, NULL, 0, 0},		/* 119 Undefined       */

html.h

@@ -204,6 +204,8 @@ typedef struct {
 #define HTML_N_STRONG	112
 #define HTML_IFRAME	113
 #define HTML_N_IFRAME	114
+#define HTML_BUTTON     115
+#define HTML_N_BUTTON   116
 
    /* pseudo tag */
 #define HTML_SELECT_INT     120

proto.h

@@ -205,6 +205,8 @@ extern int getImageSize(ImageCache * cache);
 extern Str process_img(struct parsed_tag *tag, int width);
 extern Str process_anchor(struct parsed_tag *tag, char *tagbuf);
 extern Str process_input(struct parsed_tag *tag);
+extern Str process_button(struct parsed_tag *tag);
+extern Str process_n_button(void);
 extern Str process_select(struct parsed_tag *tag);
 extern Str process_n_select(void);
 extern void feed_select(char *str);

table.c

@@ -2873,6 +2873,16 @@ feed_table_tag(struct table *tbl, char *line, struct table_mode *mode,
 	tmp = process_input(tag);
 	feed_table1(tbl, tmp, mode, width);
 	break;
+    case HTML_BUTTON:
+	tmp = process_button(tag);
+	if (tmp)
+	    feed_table1(tbl, tmp, mode, width);
+	break;
+    case HTML_N_BUTTON:
+	tmp = process_n_button();
+	if (tmp)
+	    feed_table1(tbl, tmp, mode, width);
+	break;
     case HTML_SELECT:
 	tmp = process_select(tag);
 	if (tmp)

tagtable.tab

@@ -174,3 +174,5 @@ pre_plain	HTML_PRE_PLAIN
 /pre_plain	HTML_N_PRE_PLAIN
 div_int		HTML_DIV_INT
 /div_int	HTML_N_DIV_INT
+button     HTML_BUTTON
+/button        HTML_N_BUTTON