From aef27503fb2115e096b78acf6111000803c2905b Mon Sep 17 00:00:00 2001 From: Dan Winship Date: Thu, 27 Apr 2000 19:01:18 +0000 Subject: Moved here from the mailer, since it's of general use, and the composer * e-html-utils.c (e_text_to_html): Moved here from the mailer, since it's of general use, and the composer needs it too. svn path=/trunk/; revision=2662 --- e-util/e-html-utils.c | 247 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 247 insertions(+) create mode 100644 e-util/e-html-utils.c (limited to 'e-util/e-html-utils.c') diff --git a/e-util/e-html-utils.c b/e-util/e-html-utils.c new file mode 100644 index 0000000000..8f872421d7 --- /dev/null +++ b/e-util/e-html-utils.c @@ -0,0 +1,247 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */ +/* e-html-utils.c +/* + * Copyright (C) 2000 Helix Code, Inc. + * Author: Dan Winship + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + +#include "e-html-utils.h" +#include +#include +#include +#include + +static int etth_interesting[] = { + 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x00 - 0x0f */ + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */ + 1, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* sp - / */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 1, 2, 1, 2, /* 0 - ? */ + 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ - O */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, /* P - _ */ + 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* ` - o */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 2, /* p - del */ + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x80 - 0x8f */ + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x90 - 0x9f */ + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xa0 - 0xaf */ + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xb0 - 0xbf */ + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xc0 - 0xcf */ + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xd0 - 0xdf */ + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */ + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 /* 0xf0 - 0xff */ +}; +#define ETTH_SPECIAL 1 +#define ETTH_PUNCTUATION 2 +#define ETTH_ESCAPED 3 +#define ETTH_EOF 4 + +static char * +check_size (char **buffer, int *buffer_size, char *out, int len) +{ + if (out + len > *buffer + *buffer_size) { + int index = out - *buffer; + + *buffer_size *= 2; + *buffer = g_realloc (*buffer, *buffer_size); + out = *buffer + index; + } + return out; +} + +static char * +url_extract (const char **text, gboolean check) +{ + const char *end = *text, *p; + char *out; + + while (*end && !isspace (*end) && *end != '"') + end++; + + /* Back up if we probably went too far. */ + while (end > *text && strchr (",.!?;:>", *(end - 1))) + end--; + + if (check) { + /* Make sure we weren't fooled. */ + p = memchr (*text, ':', end - *text); + if (!p || end - p < 3) + return NULL; + } + + out = g_strndup (*text, end - *text); + *text = end; + return out; +} + +/** + * e_text_to_html: + * @input: a NUL-terminated input buffer + * @flags: some combination of the E_TEXT_TO_HTML_* flags defined + * in e-html-utils.h + * + * This takes a buffer of text as input and produces a buffer of + * "equivalent" HTML, subject to certain transformation rules. + * + * The set of possible flags is: + * + * - E_TEXT_TO_HTML_PRE: wrap the output HTML in 
 and
. + * Should only be used if @input is the entire buffer to be + * converted. If e_text_to_html is being called with small pieces + * of data, you should wrap the entire result in 
 yourself.
+ *
+ *   - E_TEXT_TO_HTML_CONVERT_NL: convert "\n" to "
\n" on output.
+ *     (should not be used with E_TEXT_TO_HTML_PRE, since that would
+ *     result in double-newlines).
+ *
+ *   - E_TEXT_TO_HTML_CONVERT_SPACES: convert a block of N spaces
+ *     into N-1 non-breaking spaces and one normal space. A space
+ *     at the start of the buffer is always converted to a
+ *     non-breaking space, regardless of the following character,
+ *     which probably means you don't want to use this flag on
+ *     pieces of data that aren't delimited by at least line breaks.
+ *
+ *   - E_TEXT_TO_HTML_CONVERT_URLS: wrap   around
+ *     strings that look like URLs.
+ **/
+char *
+e_text_to_html (const char *input, unsigned int flags)
+{
+	const unsigned char *cur = input, *end;
+	char *buffer = NULL;
+	char *out = NULL;
+	int buffer_size = 0;
+
+	/* Allocate a translation buffer.  */
+	buffer_size = strlen (input) * 2 + 5;
+	buffer = g_malloc (buffer_size);
+
+	out = buffer;
+	if (flags & E_TEXT_TO_HTML_PRE)
+		out += sprintf (out, "
\n");
+
+	while (*cur) {
+		if (isalpha (*cur) && (flags & E_TEXT_TO_HTML_CONVERT_URLS)) {
+			char *tmpurl = NULL, *refurl, *dispurl;
+
+			if (!strncasecmp (cur, "http://", 7) ||
+			    !strncasecmp (cur, "https://", 8) ||
+			    !strncasecmp (cur, "ftp://", 6) ||
+			    !strncasecmp (cur, "nntp://", 7) ||
+			    !strncasecmp (cur, "mailto:", 7) ||
+			    !strncasecmp (cur, "news:", 5)) {
+				tmpurl = url_extract (&cur, TRUE);
+				if (tmpurl) {
+					refurl = e_text_to_html (tmpurl, 0);
+					dispurl = g_strdup (refurl);
+				}
+			} else if (!strncasecmp (cur, "www.", 4) &&
+				   isalnum (*(cur + 4))) {
+				tmpurl = url_extract (&cur, FALSE);
+				dispurl = e_text_to_html (tmpurl, 0);
+				refurl = g_strdup_printf ("http://%s",
+							  dispurl);
+			}
+
+			if (tmpurl) {
+				out = check_size (&buffer, &buffer_size, out,
+						  strlen (refurl) +
+						  strlen (dispurl) + 15);
+				out += sprintf (out,
+						"%s",
+						refurl, dispurl);
+				g_free (tmpurl);
+				g_free (refurl);
+				g_free (dispurl);
+			}
+		}
+
+		/* Skip until we need to care. */
+		end = cur;
+		while (!etth_interesting[*end] ||
+			(etth_interesting[*end] == ETTH_PUNCTUATION &&
+			 !(flags & E_TEXT_TO_HTML_CONVERT_URLS)))
+			end++;
+
+		out = check_size (&buffer, &buffer_size, out,
+				  end - cur + 10);
+		memcpy (out, cur, end - cur);
+		out += end - cur;
+
+		if (!*end)
+			break;
+		cur = end;
+
+		switch (*cur) {
+		case '<':
+			strcpy (out, "<");
+			out += 4;
+			break;
+
+		case '>':
+			strcpy (out, ">");
+			out += 4;
+			break;
+
+		case '&':
+			strcpy (out, "&");
+			out += 5;
+			break;
+
+		case '"':
+			strcpy (out, """);
+			out += 6;
+			break;
+
+		case '\n':
+			*out++ = *cur;
+			if (flags & E_TEXT_TO_HTML_CONVERT_NL) {
+				strcpy (out, "
");
+				out += 4;
+			}
+			break;
+
+		case ' ':
+			if (flags & E_TEXT_TO_HTML_CONVERT_SPACES) {
+				if (cur == input || *(cur + 1) == ' ') {
+					strcpy (out, " ");
+					out += 6;
+					break;
+				}
+			}
+			/* otherwise, FALL THROUGH */
+
+		default:
+			if ((*cur >= 0x20 && *cur < 0x80) ||
+			    (*cur == '\r' || *cur == '\t')) {
+				/* Default case, just copy. */
+				*out++ = *cur;
+			} else
+				out += g_snprintf(out, 9, "&#%d;", *cur);
+			break;
+		}
+
+		cur++;
+	}
+
+	out = check_size (&buffer, &buffer_size, out, 7);
+	if (flags & E_TEXT_TO_HTML_PRE)
+		strcpy (out, "
");
+	else
+		*out = '\0';
+
+	return buffer;
+}
-- 
cgit