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Date: Sun, 07 Mar 2004 13:07:08 -0500
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Subject: Function proposal: nl2p
From: lphuberdeau@sympatico.ca (Louis-Philippe Huberdeau)

I wrote this very simple function (modification from nl2br actually) to 
convert newlines to well formatted HTML paragraphs instead of line 
breaks, allowing better formatting of a dynamic output. It's not the 
most perfect piece of code ever written, but it works and it can be 
quite useful.

The <br /> tag does not have as much possibilities as the <p> tag when 
it comes to CSS, which gave me the idea to write this function.

--
Louis-Philippe Huberdeau


--- BEGIN ---

/* {{{ proto string nl2p(string str)
    Converts newlines to HTML paragraphs for standard compliance */
PHP_FUNCTION(nl2p)
{
	/* in brief this inserts </p>\n<p> before matched regexp \n\r?|\r\n? ,
	   <p> before the string and </p> after the string */
	zval	**zstr;
	char	*tmp, *str;
	int	new_length;
	char	*end, *target;
	int	repl_cnt = 0;
	int seen_other_char = 0;

	if (ZEND_NUM_ARGS() != 1 || zend_get_parameters_ex(1, &zstr) == FAILURE) {
		WRONG_PARAM_COUNT;
	}
	
	convert_to_string_ex(zstr);

	str = Z_STRVAL_PP(zstr);
	end = str + Z_STRLEN_PP(zstr);
	
	/* it is really faster to scan twice and allocate mem once insted 
scanning once
	   and constantly reallocing */
	while (str < end) {
		if( seen_other_char ) {
			if (*str == '\r') {
				if (*(str+1) == '\n') {
					str++;
				}
				repl_cnt++;

				seen_other_char = 0;
			} else if (*str == '\n') {
				if (*(str+1) == '\r') {
					str++;
				}
				repl_cnt++;

				seen_other_char = 0;
			}
		} else if( *str != '\n' && *str != '\r' ) {
			seen_other_char = 1;
		}
		
		str++;
	}
	
	if (repl_cnt == 0) {
		RETURN_STRINGL(Z_STRVAL_PP(zstr), Z_STRLEN_PP(zstr), 1);
	}

	new_length = Z_STRLEN_PP(zstr) + repl_cnt * (sizeof("\n</p>\n<p>") - 1) 
+ sizeof("\n<p>\n") + sizeof("\n</p>");
	tmp = target = emalloc(new_length + 1);

	str = Z_STRVAL_PP(zstr);

	*target++ = '\n';
	*target++ = '<';
	*target++ = 'p';
	*target++ = '>';
	*target++ = '\n';

	seen_other_char = 0;

	while (str < end) {
		switch (*str) {
			case '\r':
			case '\n':
				if( seen_other_char ) {
					*target++ = '\n';
					*target++ = '<';
					*target++ = '/';
					*target++ = 'p';
					*target++ = '>';
					*target++ = '\n';
					*target++ = '<';
					*target++ = 'p';
					*target++ = '>';
				
					if ((*str == '\r' && *(str+1) == '\n') || (*str == '\n' && *(str+1) 
== '\r')) {
						*target++ = *str++;
					}

					seen_other_char = 0;
				}

				*target++ = *str;
				break;
			default:
				seen_other_char = 1;
				*target++ = *str;
		}
	
		str++;
	}

	*target++ = '\n';
	*target++ = '<';
	*target++ = '/';
	*target++ = 'p';
	*target++ = '>';
	*target++ = '\n';
	
	*target = '\0';

	RETURN_STRINGL(tmp, new_length, 0);
}
/* }}} */


--- END ---