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<?php
/**
*
* Regex management.
*
*/
namespace CssCrush;
class Regex
{
// Patterns.
public static $patt;
// Character classes.
public static $classes;
public static function init()
{
self::$patt = $patt = new \stdClass();
self::$classes = $classes = new \stdClass();
// CSS type classes.
$classes->ident = '[a-zA-Z0-9_-]+';
$classes->number = '[+-]?\d*\.?\d+';
$classes->percentage = $classes->number . '%';
$classes->length_unit = '(?i)(?:e[mx]|c[hm]|rem|v[hwm]|in|p[tcx])(?-i)';
$classes->length = $classes->number . $classes->length_unit;
$classes->color_hex = '#[[:xdigit:]]{3}(?:[[:xdigit:]]{3})?';
// Tokens.
$classes->token_id = '[0-9a-z]+';
$classes->c_token = '\?c' . $classes->token_id . '\?'; // Comments.
$classes->s_token = '\?s' . $classes->token_id . '\?'; // Strings.
$classes->r_token = '\?r' . $classes->token_id . '\?'; // Rules.
$classes->u_token = '\?u' . $classes->token_id . '\?'; // URLs.
$classes->t_token = '\?t' . $classes->token_id . '\?'; // Traces.
$classes->a_token = '\?a(' . $classes->token_id . ')\?'; // Args.
// Boundries.
$classes->LB = '(?<![\w-])'; // Left ident boundry.
$classes->RB = '(?![\w-])'; // Right ident boundry.
// Recursive block matching.
$classes->block = '(?<block>\{\s*(?<block_content>(?:(?>[^{}]+)|(?&block))*)\})';
$classes->parens = '(?<parens>\(\s*(?<parens_content>(?:(?>[^()]+)|(?&parens))*)\))';
// Misc.
$classes->vendor = '-[a-zA-Z]+-';
$classes->hex = '[[:xdigit:]]';
$classes->newline = '(\r\n?|\n)';
// Create standalone class patterns, add classes as class swaps.
foreach ($classes as $name => $class) {
$patt->{$name} = '~' . $class . '~S';
}
// Rooted classes.
$patt->rooted_ident = '~^' . $classes->ident . '$~';
$patt->rooted_number = '~^' . $classes->number . '$~';
// @-rules.
$patt->import = Regex::make('~@' . 'import \s+ ({{u_token}}) \s? ([^;]*);~ixS');
$patt->charset = Regex::make('~@charset \s+ ({{s_token}}) \s*;~ixS');
$patt->mixin = Regex::make('~@mixin \s+ (?<name>{{ident}}) \s* {{block}}~ixS');
$patt->fragmentCapture = Regex::make('~@fragment \s+ (?<name>{{ident}}) \s* {{block}}~ixS');
$patt->fragmentInvoke = Regex::make('~@fragment \s+ (?<name>{{ident}}) {{parens}}? \s* ;~ixS');
$patt->abstract = Regex::make('~^@abstract \s+ (?<name>{{ident}})~ixS');
// Functions.
$patt->functionTest = Regex::make('~{{ LB }} (?<func_name>{{ ident }}) \(~xS');
$patt->thisFunction = Functions::makePattern(array('this'));
// Strings and comments.
$patt->string = '~(\'|")(?:\\\\\1|[^\1])*?\1~xS';
$patt->commentAndString = '~
# Quoted string (to EOF if unmatched).
(\'|")(?:\\\\\1|[^\1])*?(?:\1|$)
|
# Block comment (to EOF if unmatched).
/\*(?:[^*]*\*+(?:[^/*][^*]*\*+)*/|.*)
~xsS';
// Misc.
$patt->vendorPrefix = '~^-([a-z]+)-([a-z-]+)~iS';
$patt->ruleDirective = '~^(?:(@' . 'include)|(@extends?)|(@name))[\s]+~iS';
$patt->argListSplit = '~\s*[,\s]\s*~S';
$patt->cruftyHex = Regex::make('~\#({{hex}})\1({{hex}})\2({{hex}})\3~S');
$patt->token = Regex::make('~^ \? (?<type>[a-zA-Z]) {{token_id}} \? $~xS');
}
public static function make($pattern)
{
static $cache = array();
if (isset($cache[$pattern])) {
return $cache[$pattern];
}
return $cache[$pattern] = preg_replace_callback('~\{\{ *(?<name>\w+) *\}\}~S', function ($m) {
return Regex::$classes->{ $m['name'] };
}, $pattern);
}
public static function matchAll($patt, $subject, $offset = 0)
{
$count = preg_match_all($patt, $subject, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offset);
return $count ? $matches : array();
}
}
Regex::init();