From 24ee471cb154a84a004efc7ec92dde1c1474426c Mon Sep 17 00:00:00 2001
From: Dan Winship <danw@src.gnome.org>
Date: Mon, 6 Jan 2003 18:55:31 +0000
Subject: Add this back: Connector needs it, and there's no reason for
 addressbook

	* e-html-utils.c: Add this back: Connector needs it, and there's
	no reason for addressbook and calendar to be using camel to get
	this functionality.

	* Makefile.am (libeutil_la_SOURCES): re-add e-html-utils

svn path=/trunk/; revision=19246
---
 e-util/e-html-utils.c | 408 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 408 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..12aee18d2b
--- /dev/null
+++ b/e-util/e-html-utils.c
@@ -0,0 +1,408 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/* e-html-utils.c
+ * Copyright (C) 2000  Ximian, Inc.
+ * Author: Dan Winship <danw@ximian.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * 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 <ctype.h>
+#include <stdio.h>
+#include <string.h>
+#include <glib.h>
+
+#include "e-html-utils.h"
+
+static char *
+check_size (char **buffer, int *buffer_size, char *out, int len)
+{
+	if (out + len + 1> *buffer + *buffer_size) {
+		int index = out - *buffer;
+
+		*buffer_size = MAX (index + len + 1, *buffer_size * 2);
+		*buffer = g_realloc (*buffer, *buffer_size);
+		out = *buffer + index;
+	}
+	return out;
+}
+
+/* 1 = non-email-address chars: ()<>@,;:\"[]`'{}| */
+/* 2 = trailing url garbage:    ,.!?;:>)]}`'-_|   */
+/* 4 = dns chars                                  */
+static int special_chars[] = {
+	3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,    /*  nul - 0x0f */
+	3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,    /* 0x10 - 0x1f */
+	1, 2, 1, 0, 0, 0, 0, 3, 1, 3, 0, 0, 3, 6, 6, 0,    /*   sp - /    */
+	4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 0, 3, 2,    /*    0 - ?    */
+	1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,    /*    @ - O    */
+	4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 3, 0, 2,    /*    P - _    */
+	3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,    /*    ` - o    */
+	4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 3, 3, 0, 3     /*    p - del  */
+};
+
+#define is_addr_char(c) (c < 128 && !(special_chars[c] & 1))
+#define is_trailing_garbage(c) (c > 127 || (special_chars[c] & 2))
+#define is_domain_name_char(c) (c < 128 && (special_chars[c] & 4))
+
+static char *
+url_extract (const unsigned char **text, gboolean check)
+{
+	const unsigned char *end = *text, *p;
+	char *out;
+
+	while (*end && !isspace (*end) && (*end != '"') && (*end < 0x80))
+		end++;
+
+	/* Back up if we probably went too far. */
+	while (end > *text && is_trailing_garbage (*(end - 1)))
+		end--;
+
+	if (check) {
+		/* Make sure we weren't fooled. */
+		p = memchr (*text, ':', end - *text);
+		if (!p || end - p < 4)
+			return NULL;
+	}
+
+	out = g_strndup (*text, end - *text);
+	*text = end;
+	return out;
+}
+
+static char *
+email_address_extract (const unsigned char **cur, char **out, const unsigned char *linestart)
+{
+	const unsigned char *start, *end, *dot;
+	char *addr;
+
+	/* *cur points to the '@'. Look backward for a valid local-part */
+	for (start = *cur; start - 1 >= linestart && is_addr_char (*(start - 1)); start--)
+		;
+	if (start == *cur)
+		return NULL;
+
+	/* Now look forward for a valid domain part */
+	for (end = *cur + 1, dot = NULL; is_domain_name_char (*end); end++) {
+		if (*end == '.' && !dot)
+			dot = end;
+	}
+	if (!dot)
+		return NULL;
+
+	/* Remove trailing garbage */
+	while (is_trailing_garbage (*(end - 1)))
+		end--;
+	if (dot > end)
+		return NULL;
+
+	addr = g_strndup (start, end - start);
+	*out -= *cur - start;
+	*cur = end;
+
+	return addr;
+}
+
+static gboolean
+is_citation (const unsigned char *c, gboolean saw_citation)
+{
+	const unsigned char *p;
+
+	if (*c != '>')
+		return FALSE;
+
+	/* A line that starts with a ">" is a citation, unless it's
+	 * just mbox From-mangling...
+	 */
+	if (strncmp (c, ">From ", 6) != 0)
+		return TRUE;
+
+	/* If the previous line was a citation, then say this
+	 * one is too.
+	 */
+	if (saw_citation)
+		return TRUE;
+
+	/* Same if the next line is */
+	p = (const unsigned char *)strchr ((const char *)c, '\n');
+	if (p && *++p == '>')
+		return TRUE;
+
+	/* Otherwise, it was just an isolated ">From" line. */
+	return FALSE;
+}
+
+/**
+ * e_text_to_html_full:
+ * @input: a NUL-terminated input buffer
+ * @flags: some combination of the E_TEXT_TO_HTML_* flags defined
+ * in e-html-utils.h
+ * @color: color for citation highlighting
+ *
+ * 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 <PRE> and </PRE>.
+ *     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 <PRE> yourself.
+ *
+ *   - E_TEXT_TO_HTML_CONVERT_NL: convert "\n" to "<BR>\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.
+ *
+ *     If E_TEXT_TO_HTML_CONVERT_NL and E_TEXT_TO_HTML_CONVERT_SPACES
+ *     are both defined, then TABs will also be converted to spaces.
+ *
+ *   - E_TEXT_TO_HTML_CONVERT_URLS: wrap <a href="..."> </a> around
+ *     strings that look like URLs.
+ *
+ *   - E_TEXT_TO_HTML_CONVERT_ADDRESSES: wrap <a href="mailto:..."> </a> around
+ *     strings that look like mail addresses.
+ *
+ *   - E_TEXT_TO_HTML_MARK_CITATION: wrap <font color="..."> </font> around
+ *     citations (lines beginning with "> ", etc).
+ *
+ *   - E_TEXT_TO_HTML_ESCAPE_8BIT: flatten everything to US-ASCII
+ *
+ *   - E_TEXT_TO_HTML_CITE: quote the text with "> " at the start of each
+ *     line.
+ **/
+char *
+e_text_to_html_full (const char *input, unsigned int flags, guint32 color)
+{
+	const unsigned char *cur, *next, *linestart;
+	char *buffer = NULL;
+	char *out = NULL;
+	int buffer_size = 0, col;
+	gboolean colored = FALSE, saw_citation = FALSE;
+
+	/* 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, "<PRE>");
+
+	col = 0;
+
+	for (cur = linestart = input; cur && *cur; cur = next) {
+		gunichar u;
+
+		if (flags & E_TEXT_TO_HTML_MARK_CITATION && col == 0) {
+			saw_citation = is_citation (cur, saw_citation);
+			if (saw_citation) {
+				if (!colored) {
+					gchar font [25];
+
+					g_snprintf (font, 25, "<FONT COLOR=\"#%06x\">", color);
+
+					out = check_size (&buffer, &buffer_size, out, 25);
+					out += sprintf (out, "%s", font);
+					colored = TRUE;
+				}
+			} else if (colored) {
+				gchar *no_font = "</FONT>";
+
+				out = check_size (&buffer, &buffer_size, out, 9);
+				out += sprintf (out, "%s", no_font);
+				colored = FALSE;
+			}
+
+			/* Display mbox-mangled ">From" as "From" */
+			if (*cur == '>' && !saw_citation)
+				cur++;
+		} else if (flags & E_TEXT_TO_HTML_CITE && col == 0) {
+			out = check_size (&buffer, &buffer_size, out, 5);
+			out += sprintf (out, "&gt; ");
+		}
+
+		u = g_utf8_get_char (cur);
+		if (g_unichar_isalpha (u) &&
+		    (flags & E_TEXT_TO_HTML_CONVERT_URLS)) {
+			char *tmpurl = NULL, *refurl = NULL, *dispurl = NULL;
+
+			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) ||
+			    !strncasecmp (cur, "file:", 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) &&
+				   (*(cur + 4) < 0x80) &&
+				   g_unichar_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,
+						"<a href=\"%s\">%s</a>",
+						refurl, dispurl);
+				col += strlen (tmpurl);
+				g_free (tmpurl);
+				g_free (refurl);
+				g_free (dispurl);
+			}
+
+			if (!*cur)
+				break;
+			u = g_utf8_get_char (cur);
+		}
+
+		if (u == '@' && (flags & E_TEXT_TO_HTML_CONVERT_ADDRESSES)) {
+			char *addr, *dispaddr, *outaddr;
+
+			addr = email_address_extract (&cur, &out, linestart);
+			if (addr) {
+				dispaddr = e_text_to_html (addr, 0);
+				outaddr = g_strdup_printf ("<a href=\"mailto:%s\">%s</a>",
+							   addr, dispaddr);
+				out = check_size (&buffer, &buffer_size, out, strlen (outaddr));
+				out += sprintf (out, "%s", outaddr);
+				col += strlen (addr);
+				g_free (addr);
+				g_free (dispaddr);
+				g_free (outaddr);
+
+				if (!*cur)
+					break;
+				u = g_utf8_get_char (cur);
+			}
+		}
+
+		if (!g_unichar_validate (u)) {
+			/* Sigh. Someone sent undeclared 8-bit data.
+			 * Assume it's iso-8859-1.
+			 */
+			u = *cur;
+			next = cur + 1;
+		} else
+			next = g_utf8_next_char (cur);
+
+		out = check_size (&buffer, &buffer_size, out, 10);
+
+		switch (u) {
+		case '<':
+			strcpy (out, "&lt;");
+			out += 4;
+			col++;
+			break;
+
+		case '>':
+			strcpy (out, "&gt;");
+			out += 4;
+			col++;
+			break;
+
+		case '&':
+			strcpy (out, "&amp;");
+			out += 5;
+			col++;
+			break;
+
+		case '"':
+			strcpy (out, "&quot;");
+			out += 6;
+			col++;
+			break;
+
+		case '\n':
+			if (flags & E_TEXT_TO_HTML_CONVERT_NL) {
+				strcpy (out, "<br>");
+				out += 4;
+			}
+			*out++ = *cur;
+			linestart = cur;
+			col = 0;
+			break;
+
+		case '\t':
+			if (flags & (E_TEXT_TO_HTML_CONVERT_SPACES |
+				     E_TEXT_TO_HTML_CONVERT_NL)) {
+				do {
+					out = check_size (&buffer, &buffer_size,
+						    out, 7);
+					strcpy (out, "&nbsp;");
+					out += 6;
+					col++;
+				} while (col % 8);
+				break;
+			}
+			/* otherwise, FALL THROUGH */
+
+		case ' ':
+			if (flags & E_TEXT_TO_HTML_CONVERT_SPACES) {
+				if (cur == (const unsigned char *)input ||
+				    *(cur + 1) == ' ' || *(cur + 1) == '\t' ||
+				    *(cur - 1) == '\n') {
+					strcpy (out, "&nbsp;");
+					out += 6;
+					col++;
+					break;
+				}
+			}
+			/* otherwise, FALL THROUGH */
+
+		default:
+			if ((u >= 0x20 && u < 0x80) ||
+			    (u == '\r' || u == '\t')) {
+				/* Default case, just copy. */
+				*out++ = u;
+			} else {
+				if (flags & E_TEXT_TO_HTML_ESCAPE_8BIT)
+					*out++ = '?';
+				else
+					out += g_snprintf(out, 9, "&#%d;", u);
+			}
+			col++;
+			break;
+		}
+	}
+
+	out = check_size (&buffer, &buffer_size, out, 7);
+	if (flags & E_TEXT_TO_HTML_PRE)
+		strcpy (out, "</PRE>");
+	else
+		*out = '\0';
+
+	return buffer;
+}
+
+char *
+e_text_to_html (const char *input, unsigned int flags)
+{
+	return e_text_to_html_full (input, flags, 0);
+}
-- 
cgit