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indenting-functies
Code (php)
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<?php
/**
Regex tree:
\A # Assert position at the beginning of the string
[\r\n] # Match a single character present in the list below
# A carriage return character
# A line feed character
* # Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
( # Match the regular expression below and capture its match into backreference number 1
[ \t] # Match a single character present in the list below
# The character " "
# A tab character
+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
)
[^\r\n] # Match a single character NOT present in the list below
# A carriage return character
# A line feed character
*+ # Between zero and unlimited times, as many times as possible, without giving back (possessive)
[\r\n] # Match a single character present in the list below
# A carriage return character
# A line feed character
++ # Between one and unlimited times, as many times as possible, without giving back (possessive)
(?> # Atomic group. Match the regex below, and do not try further permutations of it if the overall match fails.
| # Match either the regular expression below (attempting the next alternative only if this one fails)
\1 # Match the same text as most recently matched by capturing group number 1
[^\r\n] # Match a single character NOT present in the list below
# A carriage return character
# A line feed character
*+ # Between zero and unlimited times, as many times as possible, without giving back (possessive)
(?: # Match the regular expression below
# Match either the regular expression below (attempting the next alternative only if this one fails)
[\r\n] # Match a single character present in the list below
# A carriage return character
# A line feed character
+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
| # Or match regular expression number 2 below (the entire group fails if this one fails to match)
\z # Assert position at the very end of the string
)
| # Or match regular expression number 2 below (the entire group fails if this one fails to match)
[\r\n] # Match a single character present in the list below
# A carriage return character
# A line feed character
+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
)+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
\z # Assert position at the very end of the string
*/
/**
* Unindent de gegeven string naar het begin van de regel indien mogelijk
*
* Hierbij worden lege regels overgeslagen
*
* N.b.: de langste substring wordt gebruikt, dus alle indenting moet exact
* gelijk aan elkaar zijn, anders wordt wellicht niet alles gematcht
*
* @param string $text
* @return string
*/
function unindent($text) {
// fix voor phphulp
if (preg_match('{\A[\r\n]*([ \t]+)[^\r\n]*+[\r\n]++(?' . '>\1[^\r\n]*+(?:[\r\n]+|\z)|[\r\n]+)+\z}', rtrim($text), $match)) {
$text = preg_replace('{^' . $match[1] . '}m', '', $text);
}
return $text;
}
/**
* Indent een gegeven string naar een bepaalde diepte
*
* @param string $text
* @param numeric $indent hoe vaak moet $char vooraan iedere regel terugkomen
* @param string $char welk karakter wordt gebruikt voor indenten
* @return string
*/
function indent($text, $indent, $char = "\t") {
return preg_replace('{^}m', str_repeat($char, $indent), $text);
}
/**
* Deze functie is een combinatie van {@link unindent} en {@link indent}
*
* @param string $text
* @param numeric $indent hoe vaak moet $char vooraan iedere regel terugkomen
* @param string $char welk karakter wordt gebruikt voor indenten
* @return string
*/
function indentTo($text, $indent, $char = "\t") {
return indent(unindent($text), $indent, $char);
}
//
// Voorbeeldje
//
$example = '
Dit is een voorbeeld tekst!
Zoals je ziet is deze regel origineel twee spaties geindent :-)
En deze vijf!
En deze maar drie. Kijken wat er gebeurt :-)
';
echo '<pre>', htmlspecialchars(
unindent($example)
. "\n\n" .
indent($example, 1)
. "\n\n" .
indentTo($example, 1, ' ')
), '</pre>';
?>
/**
Regex tree:
\A # Assert position at the beginning of the string
[\r\n] # Match a single character present in the list below
# A carriage return character
# A line feed character
* # Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
( # Match the regular expression below and capture its match into backreference number 1
[ \t] # Match a single character present in the list below
# The character " "
# A tab character
+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
)
[^\r\n] # Match a single character NOT present in the list below
# A carriage return character
# A line feed character
*+ # Between zero and unlimited times, as many times as possible, without giving back (possessive)
[\r\n] # Match a single character present in the list below
# A carriage return character
# A line feed character
++ # Between one and unlimited times, as many times as possible, without giving back (possessive)
(?> # Atomic group. Match the regex below, and do not try further permutations of it if the overall match fails.
| # Match either the regular expression below (attempting the next alternative only if this one fails)
\1 # Match the same text as most recently matched by capturing group number 1
[^\r\n] # Match a single character NOT present in the list below
# A carriage return character
# A line feed character
*+ # Between zero and unlimited times, as many times as possible, without giving back (possessive)
(?: # Match the regular expression below
# Match either the regular expression below (attempting the next alternative only if this one fails)
[\r\n] # Match a single character present in the list below
# A carriage return character
# A line feed character
+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
| # Or match regular expression number 2 below (the entire group fails if this one fails to match)
\z # Assert position at the very end of the string
)
| # Or match regular expression number 2 below (the entire group fails if this one fails to match)
[\r\n] # Match a single character present in the list below
# A carriage return character
# A line feed character
+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
)+ # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
\z # Assert position at the very end of the string
*/
/**
* Unindent de gegeven string naar het begin van de regel indien mogelijk
*
* Hierbij worden lege regels overgeslagen
*
* N.b.: de langste substring wordt gebruikt, dus alle indenting moet exact
* gelijk aan elkaar zijn, anders wordt wellicht niet alles gematcht
*
* @param string $text
* @return string
*/
function unindent($text) {
// fix voor phphulp
if (preg_match('{\A[\r\n]*([ \t]+)[^\r\n]*+[\r\n]++(?' . '>\1[^\r\n]*+(?:[\r\n]+|\z)|[\r\n]+)+\z}', rtrim($text), $match)) {
$text = preg_replace('{^' . $match[1] . '}m', '', $text);
}
return $text;
}
/**
* Indent een gegeven string naar een bepaalde diepte
*
* @param string $text
* @param numeric $indent hoe vaak moet $char vooraan iedere regel terugkomen
* @param string $char welk karakter wordt gebruikt voor indenten
* @return string
*/
function indent($text, $indent, $char = "\t") {
return preg_replace('{^}m', str_repeat($char, $indent), $text);
}
/**
* Deze functie is een combinatie van {@link unindent} en {@link indent}
*
* @param string $text
* @param numeric $indent hoe vaak moet $char vooraan iedere regel terugkomen
* @param string $char welk karakter wordt gebruikt voor indenten
* @return string
*/
function indentTo($text, $indent, $char = "\t") {
return indent(unindent($text), $indent, $char);
}
//
// Voorbeeldje
//
$example = '
Dit is een voorbeeld tekst!
Zoals je ziet is deze regel origineel twee spaties geindent :-)
En deze vijf!
En deze maar drie. Kijken wat er gebeurt :-)
';
echo '<pre>', htmlspecialchars(
unindent($example)
. "\n\n" .
indent($example, 1)
. "\n\n" .
indentTo($example, 1, ' ')
), '</pre>';
?>