Permalink
Fetching contributors…
Cannot retrieve contributors at this time
2691 lines (2278 sloc) 66 KB
<?php
/**
* lessphp v0.3.4
* http://leafo.net/lessphp
*
* LESS css compiler, adapted from http://lesscss.org
*
* Copyright 2012, Leaf Corcoran <leafot@gmail.com>
* Licensed under MIT or GPLv3, see LICENSE
*/
/**
* The less compiler and parser.
*
* Converting LESS to CSS is a two stage process. First the incoming document
* must be parsed. Parsing creates a tree in memory that represents the
* structure of the document. Then, the tree of the document is recursively
* compiled into the CSS text. The compile step has an implicit step called
* reduction, where values are brought to their lowest form before being
* turned to text, eg. mathematical equations are solved, and variables are
* dereferenced.
*
* The parsing stage produces the final structure of the document, for this
* reason mixins are mixed in and attribute accessors are referenced during
* the parse step. A reduction is done on the mixed in block as it is mixed in.
*
* See the following:
* - entry point for parsing and compiling: lessc::parse()
* - parsing: lessc::parseChunk()
* - compiling: lessc::compileBlock()
*
*/
class lessc {
public static $VERSION = "v0.3.4";
protected $buffer;
protected $count;
protected $line;
protected $libFunctions = array();
static protected $nextBlockId = 0;
static protected $TRUE = array("keyword", "true");
static protected $FALSE = array("keyword", "false");
public $indentLevel;
public $indentChar = ' ';
protected $env = null;
protected $allParsedFiles = array();
public $vPrefix = '@'; // prefix of abstract properties
public $mPrefix = '$'; // prefix of abstract blocks
public $imPrefix = '!'; // special character to add !important
public $parentSelector = '&';
// set to the parser that generated the current line when compiling
// so we know how to create error messages
protected $sourceParser = null;
static protected $precedence = array(
'=<' => 0,
'>=' => 0,
'=' => 0,
'<' => 0,
'>' => 0,
'+' => 1,
'-' => 1,
'*' => 2,
'/' => 2,
'%' => 2,
);
static protected $operatorString; // regex string to match any of the operators
// types that have delayed computation
static protected $dtypes = array('expression', 'variable',
'function', 'negative', 'list', 'lookup');
// these properties will supress division unless it's inside parenthases
static protected $supressDivisionProps = array('/border-radius$/i', '/^font$/i');
/**
* @link http://www.w3.org/TR/css3-values/
*/
static protected $units = array(
'em', 'ex', 'px', 'gd', 'rem', 'vw', 'vh', 'vm', 'ch', // Relative length units
'in', 'cm', 'mm', 'pt', 'pc', // Absolute length units
'%', // Percentages
'deg', 'grad', 'rad', 'turn', // Angles
'ms', 's', // Times
'Hz', 'kHz', //Frequencies
);
public $importDisabled = false;
public $importDir = '';
public $compat = false; // lessjs compatibility mode, does nothing right now
/**
* if we are in an expression then we don't need to worry about parsing font shorthand
* $inExp becomes true after the first value in an expression, or if we enter parens
*/
protected $inExp = false;
/**
* if we are in parens we can be more liberal with whitespace around operators because
* it must evaluate to a single value and thus is less ambiguous.
*
* Consider:
* property1: 10 -5; // is two numbers, 10 and -5
* property2: (10 -5); // should evaluate to 5
*/
protected $inParens = false;
/**
* Parse a single chunk off the head of the buffer and place it.
* @return false when the buffer is empty, or when there is an error.
*
* This function is called repeatedly until the entire document is
* parsed.
*
* This parser is most similar to a recursive descent parser. Single
* functions represent discrete grammatical rules for the language, and
* they are able to capture the text that represents those rules.
*
* Consider the function lessc::keyword(). (all parse functions are
* structured the same)
*
* The function takes a single reference argument. When calling the
* function it will attempt to match a keyword on the head of the buffer.
* If it is successful, it will place the keyword in the referenced
* argument, advance the position in the buffer, and return true. If it
* fails then it won't advance the buffer and it will return false.
*
* All of these parse functions are powered by lessc::match(), which behaves
* the same way, but takes a literal regular expression. Sometimes it is
* more convenient to use match instead of creating a new function.
*
* Because of the format of the functions, to parse an entire string of
* grammatical rules, you can chain them together using &&.
*
* But, if some of the rules in the chain succeed before one fails, then
* the buffer position will be left at an invalid state. In order to
* avoid this, lessc::seek() is used to remember and set buffer positions.
*
* Before parsing a chain, use $s = $this->seek() to remember the current
* position into $s. Then if a chain fails, use $this->seek($s) to
* go back where we started.
*/
function parseChunk() {
if (empty($this->buffer)) return false;
$s = $this->seek();
// setting a property
if ($this->keyword($key) && $this->assign() &&
$this->propertyValue($value, $key) && $this->end())
{
$this->append(array('assign', $key, $value), $s);
return true;
} else {
$this->seek($s);
}
// look for special css blocks
if ($this->env->parent == null && $this->literal('@', false)) {
$this->count--;
// a font-face block
if ($this->literal('@font-face') && $this->literal('{')) {
$b = $this->pushSpecialBlock('@font-face');
return true;
} else {
$this->seek($s);
}
// charset
if ($this->literal('@charset') && $this->propertyValue($value) &&
$this->end())
{
$this->append(array('charset', $value), $s);
return true;
} else {
$this->seek($s);
}
// media
if ($this->literal('@media') && $this->mediaTypes($types) &&
$this->literal('{'))
{
$b = $this->pushSpecialBlock('@media');
$b->media = $types;
return true;
} else {
$this->seek($s);
}
// css animations
if ($this->match('(@(-[a-z]+-)?keyframes)', $m) &&
$this->propertyValue($value) && $this->literal('{'))
{
$b = $this->pushSpecialBlock(trim($m[0]));
$b->keyframes = $value;
return true;
} else {
$this->seek($s);
}
}
if (isset($this->env->keyframes)) {
if ($this->match("(to|from|[0-9]+%)", $m) && $this->literal('{')) {
$this->pushSpecialBlock($m[1]);
return true;
} else {
$this->seek($s);
}
}
// setting a variable
if ($this->variable($var) && $this->assign() &&
$this->propertyValue($value) && $this->end())
{
$this->append(array('assign', $var, $value), $s);
return true;
} else {
$this->seek($s);
}
if ($this->import($url, $media)) {
// don't check .css files
if (empty($media) && substr_compare($url, '.css', -4, 4) !== 0) {
if ($this->importDisabled) {
$this->append(array('raw', '/* import disabled */'));
} else {
$path = $this->findImport($url);
if (!is_null($path)) {
$this->append(array('import', $path), $s);
return true;
}
}
}
$this->append(array('raw', '@import url("'.$url.'")'.
($media ? ' '.$media : '').';'), $s);
return true;
}
// opening parametric mixin
if ($this->tag($tag, true) && $this->argumentDef($args, $is_vararg) &&
($this->guards($guards) || true) &&
$this->literal('{'))
{
$block = $this->pushBlock($this->fixTags(array($tag)));
$block->args = $args;
$block->is_vararg = $is_vararg;
if (!empty($guards)) $block->guards = $guards;
return true;
} else {
$this->seek($s);
}
// opening a simple block
if ($this->tags($tags) && $this->literal('{')) {
$tags = $this->fixTags($tags);
$this->pushBlock($tags);
return true;
} else {
$this->seek($s);
}
// closing a block
if ($this->literal('}')) {
try {
$block = $this->pop();
} catch (exception $e) {
$this->seek($s);
$this->throwError($e->getMessage());
}
$hidden = true;
if (!isset($block->args)) foreach ($block->tags as $tag) {
if (!is_string($tag) || $tag{0} != $this->mPrefix) {
$hidden = false;
break;
}
}
if (!$hidden) $this->append(array('block', $block), $s);
foreach ($block->tags as $tag) {
if (is_string($tag)) {
$this->env->children[$tag][] = $block;
}
}
return true;
}
// mixin
if ($this->mixinTags($tags) &&
($this->argumentValues($argv) || true) && $this->end())
{
$tags = $this->fixTags($tags);
$this->append(array('mixin', $tags, $argv), $s);
return true;
} else {
$this->seek($s);
}
// spare ;
if ($this->literal(';')) return true;
return false; // got nothing, throw error
}
function fixTags($tags) {
// move @ tags out of variable namespace
foreach ($tags as &$tag) {
if ($tag{0} == $this->vPrefix) $tag[0] = $this->mPrefix;
}
return $tags;
}
// attempts to find the path of an import url, returns null for css files
function findImport($url) {
foreach ((array)$this->importDir as $dir) {
$full = $dir.(substr($dir, -1) != '/' ? '/' : '').$url;
if ($this->fileExists($file = $full.'.less') || $this->fileExists($file = $full)) {
return $file;
}
}
return null;
}
function fileExists($name) {
// sym link workaround
return file_exists($name) || file_exists(realpath(preg_replace('/\w+\/\.\.\//', '', $name)));
}
// a list of expressions
function expressionList(&$exps) {
$values = array();
while ($this->expression($exp)) {
$values[] = $exp;
}
if (count($values) == 0) return false;
$exps = $this->compressList($values, ' ');
return true;
}
/**
* Attempt to consume an expression.
* @link http://en.wikipedia.org/wiki/Operator-precedence_parser#Pseudo-code
*/
function expression(&$out) {
$s = $this->seek();
if ($this->literal('(') && ($this->inExp = $this->inParens = true) && $this->expression($exp) && $this->literal(')')) {
$lhs = $exp;
} elseif ($this->seek($s) && $this->value($val)) {
$lhs = $val;
} else {
$this->inParens = $this->inExp = false;
$this->seek($s);
return false;
}
$out = $this->expHelper($lhs, 0);
$this->inParens = $this->inExp = false;
return true;
}
/**
* recursively parse infix equation with $lhs at precedence $minP
*/
function expHelper($lhs, $minP) {
$this->inExp = true;
$ss = $this->seek();
// if there was whitespace before the operator, then we require whitespace after
// the operator for it to be a mathematical operator.
$needWhite = false;
if (!$this->inParens && preg_match('/\s/', $this->buffer{$this->count - 1})) {
$needWhite = true;
}
// try to find a valid operator
while ($this->match(self::$operatorString.($needWhite ? '\s' : ''), $m) && self::$precedence[$m[1]] >= $minP) {
if (!$this->inParens && isset($this->env->currentProperty) && $m[1] == "/") {
foreach (self::$supressDivisionProps as $pattern) {
if (preg_match($pattern, $this->env->currentProperty)) {
$this->env->supressedDivision = true;
break 2;
}
}
}
// get rhs
$s = $this->seek();
$p = $this->inParens;
if ($this->literal('(') && ($this->inParens = true) && $this->expression($exp) && $this->literal(')')) {
$this->inParens = $p;
$rhs = $exp;
} else {
$this->inParens = $p;
if ($this->seek($s) && $this->value($val)) {
$rhs = $val;
} else {
break;
}
}
// peek for next operator to see what to do with rhs
if ($this->peek(self::$operatorString, $next) && self::$precedence[$next[1]] > self::$precedence[$m[1]]) {
$rhs = $this->expHelper($rhs, self::$precedence[$next[1]]);
}
// don't evaluate yet if it is dynamic
if (in_array($rhs[0], self::$dtypes) || in_array($lhs[0], self::$dtypes))
$lhs = array('expression', $m[1], $lhs, $rhs);
else
$lhs = $this->evaluate($m[1], $lhs, $rhs);
$ss = $this->seek();
$needWhite = false;
if (!$this->inParens && preg_match('/\s/', $this->buffer{$this->count - 1})) {
$needWhite = true;
}
}
$this->seek($ss);
return $lhs;
}
// consume a list of values for a property
function propertyValue(&$value, $keyName=null) {
$values = array();
if (!is_null($keyName)) $this->env->currentProperty = $keyName;
$s = null;
while ($this->expressionList($v)) {
$values[] = $v;
$s = $this->seek();
if (!$this->literal(',')) break;
}
if ($s) $this->seek($s);
if (!is_null($keyName)) unset($this->env->currentProperty);
if (count($values) == 0) return false;
$value = $this->compressList($values, ', ');
return true;
}
// a single value
function value(&$value) {
// try a unit
if ($this->unit($value)) return true;
// see if there is a negation
$s = $this->seek();
if ($this->literal('-', false)) {
$value = null;
if ($this->variable($var)) {
$value = array('variable', $var);
} elseif ($this->buffer{$this->count} == "(" && $this->expression($exp)) {
$value = $exp;
} else {
$this->seek($s);
}
if (!is_null($value)) {
$value = array('negative', $value);
return true;
}
} else {
$this->seek($s);
}
// accessor
// must be done before color
// this needs negation too
if ($this->accessor($a)) {
$a[1] = $this->fixTags($a[1]);
$value = $a;
return true;
}
// color
if ($this->color($value)) return true;
// css function
// must be done after color
if ($this->func($value)) return true;
// string
if ($this->string($tmp, $d)) {
$value = array('string', $d.$tmp.$d);
return true;
}
// try a keyword
if ($this->keyword($word)) {
$value = array('keyword', $word);
return true;
}
// try a variable
if ($this->variable($var)) {
$value = array('variable', $var);
return true;
}
// unquote string
if ($this->literal("~") && $this->string($value, $d)) {
$value = array("escape", $value);
return true;
} else {
$this->seek($s);
}
// css hack: \0
if ($this->literal('\\') && $this->match('([0-9]+)', $m)) {
$value = array('keyword', '\\'.$m[1]);
return true;
} else {
$this->seek($s);
}
// the spare / when supressing division
if (!empty($this->env->supressedDivision)) {
unset($this->env->supressedDivision);
if ($this->literal("/")) {
$value = array('keyword', '/');
return true;
}
}
return false;
}
// an import statement
function import(&$url, &$media) {
$s = $this->seek();
if (!$this->literal('@import')) return false;
// @import "something.css" media;
// @import url("something.css") media;
// @import url(something.css) media;
if ($this->literal('url(')) $parens = true; else $parens = false;
if (!$this->string($url)) {
if ($parens && $this->to(')', $url)) {
$parens = false; // got em
} else {
$this->seek($s);
return false;
}
}
if ($parens && !$this->literal(')')) {
$this->seek($s);
return false;
}
// now the rest is media
return $this->to(';', $media, false, true);
}
// a list of media types, very lenient
function mediaTypes(&$parts) {
$parts = array();
while ($this->to("(", $chunk, false, "[^{]")) {
$parts[] = array('raw', $chunk."(");
$s = $this->seek();
if ($this->keyword($name) && $this->assign() &&
$this->propertyValue($value))
{
$parts[] = array('assign', $name, $value);
} else {
$this->seek($s);
}
}
if ($this->to('{', $rest, true, true)) {
$parts[] = array('raw', $rest);
return true;
}
$parts = null;
return false;
}
// a scoped value accessor
// .hello > @scope1 > @scope2['value'];
function accessor(&$var) {
$s = $this->seek();
if (!$this->tags($scope, true, '>') || !$this->literal('[')) {
$this->seek($s);
return false;
}
// either it is a variable or a property
// why is a property wrapped in quotes, who knows!
if ($this->variable($name)) {
// ~
} elseif ($this->literal("'") && $this->keyword($name) && $this->literal("'")) {
// .. $this->count is messed up if we wanted to test another access type
} else {
$this->seek($s);
return false;
}
if (!$this->literal(']')) {
$this->seek($s);
return false;
}
$var = array('lookup', $scope, $name);
return true;
}
// a string
function string(&$string, &$d = null) {
$s = $this->seek();
if ($this->literal('"', false)) {
$delim = '"';
} elseif ($this->literal("'", false)) {
$delim = "'";
} else {
return false;
}
if (!$this->to($delim, $string)) {
$this->seek($s);
return false;
}
$d = $delim;
return true;
}
/**
* Consume a number and optionally a unit.
* Can also consume a font shorthand if it is a simple case.
* $allowed restricts the types that are matched.
*/
function unit(&$unit, $allowed = null) {
if (!$allowed) $allowed = self::$units;
if ($this->match('(-?[0-9]*(\.)?[0-9]+)('.implode('|', $allowed).')?', $m)) {
if (!isset($m[3])) $m[3] = 'number';
$unit = array($m[3], $m[1]);
return true;
}
return false;
}
// a # color
function color(&$out) {
$color = array('color');
if ($this->match('(#([0-9a-f]{6})|#([0-9a-f]{3}))', $m)) {
if (isset($m[3])) {
$num = $m[3];
$width = 16;
} else {
$num = $m[2];
$width = 256;
}
$num = hexdec($num);
foreach (array(3,2,1) as $i) {
$t = $num % $width;
$num /= $width;
$color[$i] = $t * (256/$width) + $t * floor(16/$width);
}
$out = $color;
return true;
}
return false;
}
// consume a list of property values delimited by ; and wrapped in ()
function argumentValues(&$args, $delim = ',') {
$s = $this->seek();
if (!$this->literal('(')) return false;
$values = array();
while (true) {
if ($this->expressionList($value)) $values[] = $value;
if (!$this->literal($delim)) break;
else {
if ($value == null) $values[] = null;
$value = null;
}
}
if (!$this->literal(')')) {
$this->seek($s);
return false;
}
$args = $values;
return true;
}
// consume an argument definition list surrounded by ()
// each argument is a variable name with optional value
// or at the end a ... or a variable named followed by ...
function argumentDef(&$args, &$is_vararg, $delim = ',') {
$s = $this->seek();
if (!$this->literal('(')) return false;
$values = array();
$is_vararg = false;
while (true) {
if ($this->literal("...")) {
$is_vararg = true;
break;
}
if ($this->variable($vname)) {
$arg = array("arg", $vname);
$ss = $this->seek();
if ($this->assign() && $this->expressionList($value)) {
$arg[] = $value;
} else {
$this->seek($ss);
if ($this->literal("...")) {
$arg[0] = "rest";
$is_vararg = true;
}
}
$values[] = $arg;
if ($is_vararg) break;
continue;
}
if ($this->value($literal)) {
$values[] = array("lit", $literal);
}
if (!$this->literal($delim)) break;
}
if (!$this->literal(')')) {
$this->seek($s);
return false;
}
$args = $values;
return true;
}
// consume a list of tags
// this accepts a hanging delimiter
function tags(&$tags, $simple = false, $delim = ',') {
$tags = array();
while ($this->tag($tt, $simple)) {
$tags[] = $tt;
if (!$this->literal($delim)) break;
}
if (count($tags) == 0) return false;
return true;
}
// list of tags of specifying mixin path
// optionally separated by > (lazy, accepts extra >)
function mixinTags(&$tags) {
$s = $this->seek();
$tags = array();
while ($this->tag($tt, true)) {
$tags[] = $tt;
$this->literal(">");
}
if (count($tags) == 0) return false;
return true;
}
// a bracketed value (contained within in a tag definition)
function tagBracket(&$value) {
$s = $this->seek();
if ($this->literal('[') && $this->to(']', $c, true) && $this->literal(']', false)) {
$value = '['.$c.']';
// whitespace?
if ($this->match('', $_)) $value .= $_[0];
// escape parent selector
$value = str_replace($this->parentSelector, "&&", $value);
return true;
}
$this->seek($s);
return false;
}
function tagExpression(&$value) {
$s = $this->seek();
if ($this->literal("(") && $this->expression($exp) && $this->literal(")")) {
$value = array('exp', $exp);
return true;
}
$this->seek($s);
return false;
}
// a single tag
function tag(&$tag, $simple = false) {
if ($simple)
$chars = '^,:;{}\][>\(\) "\'';
else
$chars = '^,;{}["\'';
if (!$simple && $this->tagExpression($tag)) {
return true;
}
$tag = '';
while ($this->tagBracket($first)) $tag .= $first;
while ($this->match('(['.$chars.'0-9]['.$chars.']*)', $m)) {
$tag .= $m[1];
if ($simple) break;
while ($this->tagBracket($brack)) $tag .= $brack;
}
$tag = trim($tag);
if ($tag == '') return false;
return true;
}
// a css function
function func(&$func) {
$s = $this->seek();
if ($this->match('(%|[\w\-_][\w\-_:\.]+|[\w_])', $m) && $this->literal('(')) {
$fname = $m[1];
$s_pre_args = $this->seek();
$args = array();
while (true) {
$ss = $this->seek();
// this ugly nonsense is for ie filter properties
if ($this->keyword($name) && $this->literal('=') && $this->expressionList($value)) {
$args[] = array('list', '=', array(array('keyword', $name), $value));
} else {
$this->seek($ss);
if ($this->expressionList($value)) {
$args[] = $value;
}
}
if (!$this->literal(',')) break;
}
$args = array('list', ',', $args);
if ($this->literal(')')) {
$func = array('function', $fname, $args);
return true;
} elseif ($fname == 'url') {
// couldn't parse and in url? treat as string
$this->seek($s_pre_args);
if ($this->to(')', $content, true) && $this->literal(')')) {
$func = array('function', $fname,array('string', $content));
return true;
}
}
}
$this->seek($s);
return false;
}
// consume a less variable
function variable(&$name) {
$s = $this->seek();
if ($this->literal($this->vPrefix, false) &&
($this->variable($sub) || $this->keyword($name)))
{
if (!empty($sub)) {
$name = array('variable', $sub);
} else {
$name = $this->vPrefix.$name;
}
return true;
}
$name = null;
$this->seek($s);
return false;
}
/**
* Consume an assignment operator
* Can optionally take a name that will be set to the current property name
*/
function assign($name = null) {
if ($name) $this->currentProperty = $name;
return $this->literal(':') || $this->literal('=');
}
// consume a keyword
function keyword(&$word) {
if ($this->match('([\w_\-\*!"][\w\-_"]*)', $m)) {
$word = $m[1];
return true;
}
return false;
}
// consume an end of statement delimiter
function end() {
if ($this->literal(';'))
return true;
elseif ($this->count == strlen($this->buffer) || $this->buffer{$this->count} == '}') {
// if there is end of file or a closing block next then we don't need a ;
return true;
}
return false;
}
function guards(&$guards) {
$s = $this->seek();
if (!$this->literal("when")) {
$this->seek($s);
return false;
}
$guards = array();
while ($this->guard_group($g)) {
$guards[] = $g;
if (!$this->literal(",")) break;
}
if (count($guards) == 0) {
$guards = null;
$this->seek($s);
return false;
}
return true;
}
// a bunch of guards that are and'd together
function guard_group(&$guard_group) {
$s = $this->seek();
$guard_group = array();
while ($this->guard($guard)) {
$guard_group[] = $guard;
if (!$this->literal("and")) break;
}
if (count($guard_group) == 0) {
$guard_group = null;
$this->seek($s);
return false;
}
return true;
}
function guard(&$guard) {
$s = $this->seek();
$negate = $this->literal("not");
if ($this->literal("(") && $this->expression($exp) && $this->literal(")")) {
$guard = $exp;
if ($negate) $guard = array("negate", $guard);
return true;
}
$this->seek($s);
return false;
}
function compressList($items, $delim) {
if (count($items) == 1) return $items[0];
else return array('list', $delim, $items);
}
// just do a shallow property merge, seems to be what lessjs does
function mergeBlock($target, $from) {
$target = clone $target;
$target->props = array_merge($target->props, $from->props);
return $target;
}
// import all imports into the block
function mixImports($block) {
$props = array();
foreach ($block->props as $prop) {
if ($prop[0] == 'import') {
list(, $path) = $prop;
$this->addParsedFile($path);
$child_less = $this->createChild($path);
$root = $child_less->parseTree();
$root->parent = $block;
$this->mixImports($root);
// inject imported blocks into this block, local will overwrite import
$block->children = array_merge($root->children, $block->children);
// splice in all the props
foreach ($root->props as $sub_prop) {
if (isset($sub_prop[-1])) {
// leave a reference to the imported file for error messages
$sub_prop[-1] = array($child_less, $sub_prop[-1]);
}
$props[] = $sub_prop;
}
} else {
$props[] = $prop;
}
}
$block->props = $props;
}
/**
* Recursively compiles a block.
* @param $block the block
* @param $parentTags the tags of the block that contained this one
*
* A block is analogous to a CSS block in most cases. A single less document
* is encapsulated in a block when parsed, but it does not have parent tags
* so all of it's children appear on the root level when compiled.
*
* Blocks are made up of props and children.
*
* Props are property instructions, array tuples which describe an action
* to be taken, eg. write a property, set a variable, mixin a block.
*
* The children of a block are just all the blocks that are defined within.
*
* Compiling the block involves pushing a fresh environment on the stack,
* and iterating through the props, compiling each one.
*
* See lessc::compileProp()
*
*/
function compileBlock($block, $parent_tags = null) {
$isRoot = $parent_tags == null && $block->tags == null;
$indent = str_repeat($this->indentChar, $this->indentLevel);
if (!empty($block->no_multiply)) {
$special_block = true;
$this->indentLevel++;
$tags = array();
} else {
$special_block = false;
// evaluate expression tags
$tags = null;
if (is_array($block->tags)) {
$tags = array();
foreach ($block->tags as $tag) {
if (is_array($tag)) {
list(, $value) = $tag;
$tags[] = $this->compileValue($this->reduce($value));
} else {
$tags[] = $tag;
}
}
}
$tags = $this->multiplyTags($parent_tags, $tags);
}
$env = $this->pushEnv();
$env->nameDepth = array();
$lines = array();
$blocks = array();
$this->mixImports($block);
foreach ($block->props as $prop) {
$this->compileProp($prop, $block, $tags, $lines, $blocks);
}
$block->scope = $env;
$this->pop();
$nl = $isRoot ? "\n".$indent :
"\n".$indent.$this->indentChar;
ob_start();
if ($special_block) {
$this->indentLevel--;
if (isset($block->media)) {
echo $this->compileMedia($block);
} elseif (isset($block->keyframes)) {
echo $block->tags[0]." ".
$this->compileValue($this->reduce($block->keyframes));
} else {
list($name) = $block->tags;
echo $indent.$name;
}
echo ' {'.(count($lines) > 0 ? $nl : "\n");
}
// dump it
if (count($lines) > 0) {
if (!$special_block && !$isRoot) {
echo $indent.implode(", ", $tags);
if (count($lines) > 1) echo " {".$nl;
else echo " { ";
}
echo implode($nl, $lines);
if (!$special_block && !$isRoot) {
if (count($lines) > 1) echo "\n".$indent."}\n";
else echo " }\n";
} else echo "\n";
}
foreach ($blocks as $b) echo $b;
if ($special_block) {
echo $indent."}\n";
}
return ob_get_clean();
}
// find the fully qualified tags for a block and its parent's tags
function multiplyTags($parents, $current) {
if ($parents == null) return $current;
$tags = array();
foreach ($parents as $ptag) {
foreach ($current as $tag) {
// inject parent in place of parent selector, ignoring escaped values
$count = 0;
$parts = explode("&&", $tag);
foreach ($parts as $i => $chunk) {
$parts[$i] = str_replace($this->parentSelector, $ptag, $chunk, $c);
$count += $c;
}
$tag = implode("&", $parts);
if ($count > 0) {
$tags[] = trim($tag);
} else {
$tags[] = trim($ptag . ' ' . $tag);
}
}
}
return $tags;
}
function eq($left, $right) {
return $left == $right;
}
function patternMatch($block, $callingArgs) {
// match the guards if it has them
// any one of the groups must have all its guards pass for a match
if (!empty($block->guards)) {
$group_passed = false;
foreach ($block->guards as $guard_group) {
foreach ($guard_group as $guard) {
$this->pushEnv();
$this->zipSetArgs($block->args, $callingArgs);
$negate = false;
if ($guard[0] == "negate") {
$guard = $guard[1];
$negate = true;
}
$passed = $this->reduce($guard) == self::$TRUE;
if ($negate) $passed = !$passed;
$this->pop();
if ($passed) {
$group_passed = true;
} else {
$group_passed = false;
break;
}
}
if ($group_passed) break;
}
if (!$group_passed) {
return false;
}
}
$numCalling = count($callingArgs);
if (empty($block->args)) {
return $block->is_vararg || $numCalling == 0;
}
$i = -1; // no args
// try to match by arity or by argument literal
foreach ($block->args as $i => $arg) {
switch ($arg[0]) {
case "lit":
if (empty($callingArgs[$i]) || !$this->eq($arg[1], $callingArgs[$i])) {
return false;
}
break;
case "arg":
// no arg and no default value
if (!isset($callingArgs[$i]) && !isset($arg[2])) {
return false;
}
break;
case "rest":
$i--; // rest can be empty
break 2;
}
}
if ($block->is_vararg) {
return true; // not having enough is handled above
} else {
$numMatched = $i + 1;
// greater than becuase default values always match
return $numMatched >= $numCalling;
}
}
function patternMatchAll($blocks, $callingArgs) {
$matches = null;
foreach ($blocks as $block) {
if ($this->patternMatch($block, $callingArgs)) {
$matches[] = $block;
}
}
return $matches;
}
// attempt to find blocks matched by path and args
function findBlocks($search_in, $path, $args, $seen=array()) {
if ($search_in == null) return null;
if (isset($seen[$search_in->id])) return null;
$seen[$search_in->id] = true;
$name = $path[0];
if (isset($search_in->children[$name])) {
$blocks = $search_in->children[$name];
if (count($path) == 1) {
$matches = $this->patternMatchAll($blocks, $args);
if (!empty($matches)) {
// This will return all blocks that match in the closest
// scope that has any matching block, like lessjs
return $matches;
}
} else {
return $this->findBlocks($blocks[0],
array_slice($path, 1), $args, $seen);
}
}
if ($search_in->parent === $search_in) return null;
return $this->findBlocks($search_in->parent, $path, $args, $seen);
}
// sets all argument names in $args to either the default value
// or the one passed in through $values
function zipSetArgs($args, $values) {
$i = 0;
$assigned_values = array();
foreach ($args as $a) {
if ($a[0] == "arg") {
if ($i < count($values) && !is_null($values[$i])) {
$value = $values[$i];
} elseif (isset($a[2])) {
$value = $a[2];
} else $value = null;
$value = $this->reduce($value);
$this->set($a[1], $value);
$assigned_values[] = $value;
}
$i++;
}
// check for a rest
$last = end($args);
if ($last[0] == "rest") {
$rest = array_slice($values, count($args) - 1);
$this->set($last[1], $this->reduce(array("list", " ", $rest)));
}
$this->env->arguments = $assigned_values;
}
// compile a prop and update $lines or $blocks appropriately
function compileProp($prop, $block, $tags, &$_lines, &$_blocks) {
// set error position context
if (isset($prop[-1])) {
if (is_array($prop[-1])) {
list($less, $count) = $prop[-1];
$parentParser = $this->sourceParser;
$this->sourceParser = $less;
$this->count = $count;
} else {
$this->count = $prop[-1];
}
} else {
$this->count = -1;
}
switch ($prop[0]) {
case 'assign':
list(, $name, $value) = $prop;
if ($name[0] == $this->vPrefix) {
$this->set($name, $value);
} else {
$_lines[] = "$name:".
$this->compileValue($this->reduce($value)).";";
}
break;
case 'block':
list(, $child) = $prop;
$_blocks[] = $this->compileBlock($child, $tags);
break;
case 'mixin':
list(, $path, $args) = $prop;
$args = array_map(array($this, "reduce"), (array)$args);
$mixins = $this->findBlocks($block, $path, $args);
if (is_null($mixins)) {
// echo "failed to find block: ".implode(" > ", $path)."\n";
break; // throw error here??
}
foreach ($mixins as $mixin) {
$old_scope = null;
if (isset($mixin->parent->scope)) {
$old_scope = $this->env;
$this->env = $mixin->parent->scope;
}
$have_args = false;
if (isset($mixin->args)) {
$have_args = true;
$this->pushEnv();
$this->zipSetArgs($mixin->args, $args);
}
$old_parent = $mixin->parent;
if ($mixin != $block) $mixin->parent = $block;
foreach ($mixin->props as $sub_prop) {
$this->compileProp($sub_prop, $mixin, $tags, $_lines, $_blocks);
}
$mixin->parent = $old_parent;
if ($have_args) $this->pop();
if ($old_scope) {
$this->env = $old_scope;
}
}
break;
case 'raw':
$_lines[] = $prop[1];
break;
case 'charset':
list(, $value) = $prop;
$_lines[] = '@charset '.$this->compileValue($this->reduce($value)).';';
break;
default:
$this->throwError("unknown op: {$prop[0]}\n");
}
if (isset($parentParser)) {
$this->sourceParser = $parentParser;
}
}
/**
* Compiles a primitive value into a CSS property value.
*
* Values in lessphp are typed by being wrapped in arrays, their format is
* typically:
*
* array(type, contents [, additional_contents]*)
*
* Will not work on non reduced values (expressions, variables, etc)
*/
function compileValue($value) {
switch ($value[0]) {
case 'list':
// [1] - delimiter
// [2] - array of values
return implode($value[1], array_map(array($this, 'compileValue'), $value[2]));
case 'keyword':
// [1] - the keyword
case 'number':
// [1] - the number
return $value[1];
case 'escape':
case 'string':
// [1] - contents of string (includes quotes)
// search for inline variables to replace
$replace = array();
if (preg_match_all('/'.$this->preg_quote($this->vPrefix).'\{([\w-_][0-9\w-_]*)\}/', $value[1], $m)) {
foreach ($m[1] as $name) {
if (!isset($replace[$name]))
$replace[$name] = $this->compileValue($this->reduce(array('variable', $this->vPrefix . $name)));
}
}
foreach ($replace as $var=>$val) {
if ($this->quoted($val)) {
$val = substr($val, 1, -1);
}
$value[1] = str_replace($this->vPrefix. '{'.$var.'}', $val, $value[1]);
}
return $value[1];
case 'color':
// [1] - red component (either number for a %)
// [2] - green component
// [3] - blue component
// [4] - optional alpha component
list(, $r, $g, $b) = $value;
$r = round($r);
$g = round($g);
$b = round($b);
if (count($value) == 5 && $value[4] != 1) { // rgba
return 'rgba('.$r.','.$g.','.$b.','.$value[4].')';
}
return sprintf("#%02x%02x%02x", $r, $g, $b);
case 'function':
// [1] - function name
// [2] - some array value representing arguments, either ['string', value] or ['list', ',', values[]]
// see if function evaluates to something else
$value = $this->reduce($value);
if ($value[0] == 'function') {
return $value[1].'('.$this->compileValue($value[2]).')';
}
else return $this->compileValue($value);
default: // assumed to be unit
return $value[1].$value[0];
}
}
function compileMedia($block) {
$mediaParts = array();
foreach ($block->media as $part) {
if ($part[0] == "raw") {
$mediaParts[] = $part[1];
} elseif ($part[0] == "assign") {
list(, $propName, $propVal) = $part;
$mediaParts[] = "$propName: ".
$this->compileValue($this->reduce($propVal));
}
}
return "@media ".trim(implode($mediaParts));
}
function lib_isnumber($value) {
return $this->toBool(is_numeric($value[1]));
}
function lib_isstring($value) {
return $this->toBool($value[0] == "string");
}
function lib_iscolor($value) {
return $this->toBool($this->coerceColor($value));
}
function lib_iskeyword($value) {
return $this->toBool($value[0] == "keyword");
}
function lib_ispixel($value) {
return $this->toBool($value[0] == "px");
}
function lib_ispercentage($value) {
return $this->toBool($value[0] == "%");
}
function lib_isem($value) {
return $this->toBool($value[0] == "em");
}
function lib_rgbahex($color) {
$color = $this->coerceColor($color);
if (is_null($color))
$this->throwError("color expected for rgbahex");
return sprintf("#%02x%02x%02x%02x",
isset($color[4]) ? $color[4]*255 : 0,
$color[1],$color[2], $color[3]);
}
function lib_argb($color){
return $this->lib_rgbahex($color);
}
// utility func to unquote a string
function lib_e($arg) {
switch ($arg[0]) {
case "list":
$items = $arg[2];
if (isset($items[0])) {
return $this->lib_e($items[0]);
}
return "";
case "string":
$str = $this->compileValue($arg);
return substr($str, 1, -1);
default:
return $this->compileValue($arg);
}
}
function lib__sprintf($args) {
if ($args[0] != "list") return $args;
$values = $args[2];
$source = $this->reduce(array_shift($values));
if ($source[0] != "string") {
return $source;
}
$str = $source[1];
$i = 0;
if (preg_match_all('/%[dsa]/', $str, $m)) {
foreach ($m[0] as $match) {
$val = isset($values[$i]) ? $this->reduce($values[$i]) : array('keyword', '');
$i++;
switch ($match[1]) {
case "s":
if ($val[0] == "string") {
$rep = substr($val[1], 1, -1);
break;
}
default:
$rep = $this->compileValue($val);
}
$str = preg_replace('/'.$this->preg_quote($match).'/', $rep, $str, 1);
}
}
return array('string', $str);
}
function lib_floor($arg) {
return array($arg[0], floor($arg[1]));
}
function lib_ceil($arg) {
return array($arg[0], ceil($arg[1]));
}
function lib_round($arg) {
return array($arg[0], round($arg[1]));
}
// is a string surrounded in quotes? returns the quoting char if true
function quoted($s) {
if (preg_match('/^("|\').*?\1$/', $s, $m))
return $m[1];
else return false;
}
/**
* Helper function to get arguments for color functions.
* Accepts invalid input, non colors interpreted as being black.
*/
function colorArgs($args) {
if ($args[0] != 'list' || count($args[2]) < 2) {
return array(array('color', 0, 0, 0));
}
list($color, $delta) = $args[2];
$color = $this->coerceColor($color);
if (is_null($color))
$color = array('color', 0, 0, 0);
$delta = floatval($delta[1]);
return array($color, $delta);
}
function lib_darken($args) {
list($color, $delta) = $this->colorArgs($args);
$hsl = $this->toHSL($color);
$hsl[3] = $this->clamp($hsl[3] - $delta, 100);
return $this->toRGB($hsl);
}
function lib_lighten($args) {
list($color, $delta) = $this->colorArgs($args);
$hsl = $this->toHSL($color);
$hsl[3] = $this->clamp($hsl[3] + $delta, 100);
return $this->toRGB($hsl);
}
function lib_saturate($args) {
list($color, $delta) = $this->colorArgs($args);
$hsl = $this->toHSL($color);
$hsl[2] = $this->clamp($hsl[2] + $delta, 100);
return $this->toRGB($hsl);
}
function lib_desaturate($args) {
list($color, $delta) = $this->colorArgs($args);
$hsl = $this->toHSL($color);
$hsl[2] = $this->clamp($hsl[2] - $delta, 100);
return $this->toRGB($hsl);
}
function lib_spin($args) {
list($color, $delta) = $this->colorArgs($args);
$hsl = $this->toHSL($color);
$hsl[1] = $hsl[1] + $delta % 360;
if ($hsl[1] < 0) $hsl[1] += 360;
return $this->toRGB($hsl);
}
function lib_fadeout($args) {
list($color, $delta) = $this->colorArgs($args);
$color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) - $delta/100);
return $color;
}
function lib_fadein($args) {
list($color, $delta) = $this->colorArgs($args);
$color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) + $delta/100);
return $color;
}
function lib_hue($color) {
if ($color[0] != 'color') return 0;
$hsl = $this->toHSL($color);
return round($hsl[1]);
}
function lib_saturation($color) {
if ($color[0] != 'color') return 0;
$hsl = $this->toHSL($color);
return round($hsl[2]);
}
function lib_lightness($color) {
if ($color[0] != 'color') return 0;
$hsl = $this->toHSL($color);
return round($hsl[3]);
}
// get the alpha of a color
// defaults to 1 for non-colors or colors without an alpha
function lib_alpha($color) {
if ($color[0] != 'color') return 1;
return isset($color[4]) ? $color[4] : 1;
}
// set the alpha of the color
function lib_fade($args) {
list($color, $alpha) = $this->colorArgs($args);
$color[4] = $this->clamp($alpha / 100.0);
return $color;
}
function lib_percentage($number) {
return array('%', $number[1]*100);
}
// mixes two colors by weight
// mix(@color1, @color2, @weight);
// http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
function lib_mix($args) {
if ($args[0] != "list" || count($args[2]) < 3)
$this->throwError("mix expects (color1, color2, weight)");
list($first, $second, $weight) = $args[2];
$first = $this->assertColor($first);
$second = $this->assertColor($second);
$first_a = $this->lib_alpha($first);
$second_a = $this->lib_alpha($second);
$weight = $weight[1] / 100.0;
$w = $weight * 2 - 1;
$a = $first_a - $second_a;
$w1 = (($w * $a == -1 ? $w : ($w + $a)/(1 + $w * $a)) + 1) / 2.0;
$w2 = 1.0 - $w1;
$new = array('color',
$w1 * $first[1] + $w2 * $second[1],
$w1 * $first[2] + $w2 * $second[2],
$w1 * $first[3] + $w2 * $second[3],
);
if ($first_a != 1.0 || $second_a != 1.0) {
$new[] = $first_a * $weight + $second_a * ($weight - 1);
}
return $this->fixColor($new);
}
function assertColor($value, $error = "expected color value") {
$color = $this->coerceColor($value);
if (is_null($color)) $this->throwError($error);
return $color;
}
function toHSL($color) {
if ($color[0] == 'hsl') return $color;
$r = $color[1] / 255;
$g = $color[2] / 255;
$b = $color[3] / 255;
$min = min($r, $g, $b);
$max = max($r, $g, $b);
$L = ($min + $max) / 2;
if ($min == $max) {
$S = $H = 0;
} else {
if ($L < 0.5)
$S = ($max - $min)/($max + $min);
else
$S = ($max - $min)/(2.0 - $max - $min);
if ($r == $max) $H = ($g - $b)/($max - $min);
elseif ($g == $max) $H = 2.0 + ($b - $r)/($max - $min);
elseif ($b == $max) $H = 4.0 + ($r - $g)/($max - $min);
}
$out = array('hsl',
($H < 0 ? $H + 6 : $H)*60,
$S*100,
$L*100,
);
if (count($color) > 4) $out[] = $color[4]; // copy alpha
return $out;
}
function toRGB_helper($comp, $temp1, $temp2) {
if ($comp < 0) $comp += 1.0;
elseif ($comp > 1) $comp -= 1.0;
if (6 * $comp < 1) return $temp1 + ($temp2 - $temp1) * 6 * $comp;
if (2 * $comp < 1) return $temp2;
if (3 * $comp < 2) return $temp1 + ($temp2 - $temp1)*((2/3) - $comp) * 6;
return $temp1;
}
/**
* Converts a hsl array into a color value in rgb.
* Expects H to be in range of 0 to 360, S and L in 0 to 100
*/
function toRGB($color) {
if ($color == 'color') return $color;
$H = $color[1] / 360;
$S = $color[2] / 100;
$L = $color[3] / 100;
if ($S == 0) {
$r = $g = $b = $L;
} else {
$temp2 = $L < 0.5 ?
$L*(1.0 + $S) :
$L + $S - $L * $S;
$temp1 = 2.0 * $L - $temp2;
$r = $this->toRGB_helper($H + 1/3, $temp1, $temp2);
$g = $this->toRGB_helper($H, $temp1, $temp2);
$b = $this->toRGB_helper($H - 1/3, $temp1, $temp2);
}
// $out = array('color', round($r*255), round($g*255), round($b*255));
$out = array('color', $r*255, $g*255, $b*255);
if (count($color) > 4) $out[] = $color[4]; // copy alpha
return $out;
}
function clamp($v, $max = 1, $min = 0) {
return min($max, max($min, $v));
}
/**
* Convert the rgb, rgba, hsl color literals of function type
* as returned by the parser into values of color type.
*/
function funcToColor($func) {
$fname = $func[1];
if ($func[2][0] != 'list') return false; // need a list of arguments
$rawComponents = $func[2][2];
if ($fname == 'hsl' || $fname == 'hsla') {
$hsl = array('hsl');
$i = 0;
foreach ($rawComponents as $c) {
$val = $this->reduce($c);
$val = isset($val[1]) ? floatval($val[1]) : 0;
if ($i == 0) $clamp = 360;
elseif ($i < 4) $clamp = 100;
else $clamp = 1;
$hsl[] = $this->clamp($val, $clamp);
$i++;
}
while (count($hsl) < 4) $hsl[] = 0;
return $this->toRGB($hsl);
} elseif ($fname == 'rgb' || $fname == 'rgba') {
$components = array();
$i = 1;
foreach ($rawComponents as $c) {
$c = $this->reduce($c);
if ($i < 4) {
if ($c[0] == '%') $components[] = 255 * ($c[1] / 100);
else $components[] = floatval($c[1]);
} elseif ($i == 4) {
if ($c[0] == '%') $components[] = 1.0 * ($c[1] / 100);
else $components[] = floatval($c[1]);
} else break;
$i++;
}
while (count($components) < 3) $components[] = 0;
array_unshift($components, 'color');
return $this->fixColor($components);
}
return false;
}
function toName($val) {
switch($val[0]) {
case "string":
return substr($val[1], 1, -1);
default:
return $val[1];
}
}
// reduce a delayed type to its final value
// dereference variables and solve equations
function reduce($var) {
// this is done here for infinite loop checking
if ($var[0] == "variable") {
$key = is_array($var[1]) ?
$this->vPrefix.$this->toName($this->reduce($var[1])) : $var[1];
$seen =& $this->env->seenNames;
if (!empty($seen[$key])) {
$this->throwError("infinite loop detected: $key");
}
$seen[$key] = true;
$out = $this->reduce($this->get($key));
$seen[$key] = false;
return $out;
}
while (in_array($var[0], self::$dtypes)) {
if ($var[0] == 'list') {
foreach ($var[2] as &$value) $value = $this->reduce($value);
break;
} elseif ($var[0] == 'expression') {
$var = $this->evaluate($var[1], $var[2], $var[3]);
} elseif ($var[0] == 'lookup') {
// do accessor here....
$var = array('number', 0);
} elseif ($var[0] == 'function') {
$color = $this->funcToColor($var);
if ($color) $var = $color;
else {
list($_, $name, $args) = $var;
if ($name == "%") $name = "_sprintf";
$f = isset($this->libFunctions[$name]) ?
$this->libFunctions[$name] : array($this, 'lib_'.$name);
if (is_callable($f)) {
if ($args[0] == 'list')
$args = $this->compressList($args[2], $args[1]);
$var = call_user_func($f, $this->reduce($args), $this);
// convert to a typed value if the result is a php primitive
if (is_numeric($var)) $var = array('number', $var);
elseif (!is_array($var)) $var = array('keyword', $var);
} else {
// plain function, reduce args
$var[2] = $this->reduce($var[2]);
}
}
break; // done reducing after a function
} elseif ($var[0] == 'negative') {
$value = $this->reduce($var[1]);
if (is_numeric($value[1])) {
$value[1] = -1*$value[1];
}
$var = $value;
}
}
return $var;
}
function coerceColor($value) {
switch($value[0]) {
case 'color': return $value;
case 'keyword':
$name = $value[1];
if (isset(self::$cssColors[$name])) {
list($r, $g, $b) = explode(',', self::$cssColors[$name]);
return array('color', $r, $g, $b);
}
return null;
}
}
function toBool($a) {
if ($a) return self::$TRUE;
else return self::$FALSE;
}
// evaluate an expression
function evaluate($op, $left, $right) {
$left = $this->reduce($left);
$right = $this->reduce($right);
if ($left_color = $this->coerceColor($left)) {
$left = $left_color;
}
if ($right_color = $this->coerceColor($right)) {
$right = $right_color;
}
if ($op == "and") {
return $this->toBool($left == self::$TRUE && $right == self::$TRUE);
}
if ($op == "=") {
return $this->toBool($this->eq($left, $right) );
}
if ($left[0] == 'color' && $right[0] == 'color') {
$out = $this->op_color_color($op, $left, $right);
return $out;
}
if ($left[0] == 'color') {
return $this->op_color_number($op, $left, $right);
}
if ($right[0] == 'color') {
return $this->op_number_color($op, $left, $right);
}
// concatenate strings
if ($op == '+' && $left[0] == 'string') {
$append = $this->compileValue($right);
if ($this->quoted($append)) $append = substr($append, 1, -1);
$lhs = $this->compileValue($left);
if ($q = $this->quoted($lhs)) $lhs = substr($lhs, 1, -1);
if (!$q) $q = '';
return array('string', $q.$lhs.$append.$q);
}
if ($left[0] == 'keyword' || $right[0] == 'keyword' ||
$left[0] == 'string' || $right[0] == 'string')
{
// look for negative op
if ($op == '-') $right[1] = '-'.$right[1];
return array('keyword', $this->compileValue($left) .' '. $this->compileValue($right));
}
// default to number operation
return $this->op_number_number($op, $left, $right);
}
// make sure a color's components don't go out of bounds
function fixColor($c) {
foreach (range(1, 3) as $i) {
if ($c[$i] < 0) $c[$i] = 0;
if ($c[$i] > 255) $c[$i] = 255;
}
return $c;
}
function op_number_color($op, $lft, $rgt) {
if ($op == '+' || $op = '*') {
return $this->op_color_number($op, $rgt, $lft);
}
}
function op_color_number($op, $lft, $rgt) {
if ($rgt[0] == '%') $rgt[1] /= 100;
return $this->op_color_color($op, $lft,
array_fill(1, count($lft) - 1, $rgt[1]));
}
function op_color_color($op, $left, $right) {
$out = array('color');
$max = count($left) > count($right) ? count($left) : count($right);
foreach (range(1, $max - 1) as $i) {
$lval = isset($left[$i]) ? $left[$i] : 0;
$rval = isset($right[$i]) ? $right[$i] : 0;
switch ($op) {
case '+':
$out[] = $lval + $rval;
break;
case '-':
$out[] = $lval - $rval;
break;
case '*':
$out[] = $lval * $rval;
break;
case '%':
$out[] = $lval % $rval;
break;
case '/':
if ($rval == 0) $this->throwError("evaluate error: can't divide by zero");
$out[] = $lval / $rval;
break;
default:
$this->throwError('evaluate error: color op number failed on op '.$op);
}
}
return $this->fixColor($out);
}
// operator on two numbers
function op_number_number($op, $left, $right) {
$type = is_null($left) ? "number" : $left[0];
if ($type == "number") $type = $right[0];
$value = 0;
switch ($op) {
case '+':
$value = $left[1] + $right[1];
break;
case '*':
$value = $left[1] * $right[1];
break;
case '-':
$value = $left[1] - $right[1];
break;
case '%':
$value = $left[1] % $right[1];
break;
case '/':
if ($right[1] == 0) $this->throwError('parse error: divide by zero');
$value = $left[1] / $right[1];
break;
case '<':
return $this->toBool($left[1] < $right[1]);
case '>':
return $this->toBool($left[1] > $right[1]);
case '>=':
return $this->toBool($left[1] >= $right[1]);
case '=<':
return $this->toBool($left[1] <= $right[1]);
default:
$this->throwError('parse error: unknown number operator: '.$op);
}
return array($type, $value);
}
/* environment functions */
// push a new block on the stack, used for parsing
function pushBlock($tags) {
$b = new stdclass;
$b->parent = $this->env;
$b->id = self::$nextBlockId++;
$b->is_vararg = false;
$b->tags = $tags;
$b->props = array();
$b->children = array();
$this->env = $b;
return $b;
}
// push a block that doesn't multiply tags
function pushSpecialBlock($name) {
$b = $this->pushBlock(array($name));
$b->no_multiply = true;
return $b;
}
// used for compiliation variable state
function pushEnv() {
$e = new stdclass;
$e->parent = $this->env;
$this->store = array();
$this->env = $e;
return $e;
}
// pop something off the stack
function pop() {
$old = $this->env;
$this->env = $this->env->parent;
return $old;
}
// set something in the current env
function set($name, $value) {
$this->env->store[$name] = $value;
}
// append an property
function append($prop, $pos = null) {
if (!is_null($pos)) $prop[-1] = $pos;
$this->env->props[] = $prop;
}
// get the highest occurrence entry for a name
function get($name) {
$current = $this->env;
$is_arguments = $name == $this->vPrefix . 'arguments';
while ($current) {
if ($is_arguments && isset($current->arguments)) {
return array('list', ' ', $current->arguments);
}
if (isset($current->store[$name]))
return $current->store[$name];
else
$current = $current->parent;
}
return null;
}
/* raw parsing functions */
function literal($what, $eatWhitespace = true) {
// this is here mainly prevent notice from { } string accessor
if ($this->count >= strlen($this->buffer)) return false;
// shortcut on single letter
if (!$eatWhitespace && strlen($what) == 1) {
if ($this->buffer{$this->count} == $what) {
$this->count++;
return true;
}
else return false;
}
return $this->match($this->preg_quote($what), $m, $eatWhitespace);
}
function preg_quote($what) {
return preg_quote($what, '/');
}
// advance counter to next occurrence of $what
// $until - don't include $what in advance
// $allowNewline, if string, will be used as valid char set
function to($what, &$out, $until = false, $allowNewline = false) {
if (is_string($allowNewline)) {
$validChars = $allowNewline;
} else {
$validChars = $allowNewline ? "." : "[^\n]";
}
if (!$this->match('('.$validChars.'*?)'.$this->preg_quote($what), $m, !$until)) return false;
if ($until) $this->count -= strlen($what); // give back $what
$out = $m[1];
return true;
}
// try to match something on head of buffer
function match($regex, &$out, $eatWhitespace = true) {
$r = '/'.$regex.($eatWhitespace ? '\s*' : '').'/Ais';
if (preg_match($r, $this->buffer, $out, null, $this->count)) {
$this->count += strlen($out[0]);
return true;
}
return false;
}
// match something without consuming it
function peek($regex, &$out = null) {
$r = '/'.$regex.'/Ais';
$result = preg_match($r, $this->buffer, $out, null, $this->count);
return $result;
}
// seek to a spot in the buffer or return where we are on no argument
function seek($where = null) {
if ($where === null) return $this->count;
else $this->count = $where;
return true;
}
/**
* Initialize state for a fresh parse
*/
protected function prepareParser($buff) {
$this->env = null;
$this->expandStack = array();
$this->indentLevel = 0;
$this->count = 0;
$this->line = 1;
$this->buffer = $this->removeComments($buff);
$this->pushBlock(null); // set up global scope
// trim whitespace on head
if (preg_match('/^\s+/', $this->buffer, $m)) {
$this->line += substr_count($m[0], "\n");
$this->buffer = ltrim($this->buffer);
}
}
// create a child parser (for compiling an import)
protected function createChild($fname) {
$less = new lessc($fname);
$less->importDir = array_merge((array)$less->importDir, (array)$this->importDir);
$less->indentChar = $this->indentChar;
$less->compat = $this->compat;
return $less;
}
// parse code and return intermediate tree
public function parseTree($str = null) {
$this->prepareParser(is_null($str) ? $this->buffer : $str);
while (false !== $this->parseChunk());
if ($this->count != strlen($this->buffer))
$this->throwError();
if (!is_null($this->env->parent))
throw new exception('parse error: unclosed block');
$root = $this->env;
$this->env = null;
return $root;
}
// inject array of unparsed strings into environment as variables
protected function injectVariables($args) {
$this->pushEnv();
$parser = new lessc();
foreach ($args as $name => $str_value) {
if ($name{0} != '@') $name = '@'.$name;
$parser->count = 0;
$parser->buffer = (string)$str_value;
if (!$parser->propertyValue($value)) {
throw new Exception("failed to parse passed in variable $name: $str_value");
}
$this->set($name, $value);
}
}
// parse and compile buffer
function parse($str = null, $initial_variables = null) {
$locale = setlocale(LC_NUMERIC, 0);
setlocale(LC_NUMERIC, "C");
$root = $this->parseTree($str);
if ($initial_variables) $this->injectVariables($initial_variables);
$out = $this->compileBlock($root);
setlocale(LC_NUMERIC, $locale);
return $out;
}
/**
* Uses the current value of $this->count to show line and line number
*/
function throwError($msg = 'parse error') {
if (!empty($this->sourceParser)) {
$this->sourceParser->count = $this->count;
return $this->sourceParser->throwError($msg);
} elseif ($this->count > 0) {
$line = $this->line + substr_count(substr($this->buffer, 0, $this->count), "\n");
if (isset($this->fileName)) {
$loc = $this->fileName.' on line '.$line;
} else {
$loc = "line: ".$line;
}
if ($this->peek("(.*?)(\n|$)", $m))
throw new exception($msg.': failed at `'.$m[1].'` '.$loc);
}
throw new exception($msg);
}
/**
* Initialize any static state, can initialize parser for a file
*/
function __construct($fname = null, $opts = null) {
if (!self::$operatorString) {
self::$operatorString =
'('.implode('|', array_map(array($this, 'preg_quote'),
array_keys(self::$precedence))).')';
}
if ($fname) {
if (!is_file($fname)) {
throw new Exception('load error: failed to find '.$fname);
}
$pi = pathinfo($fname);
$this->fileName = $fname;
$this->importDir = $pi['dirname'].'/';
$this->buffer = file_get_contents($fname);
$this->addParsedFile($fname);
}
}
public function registerFunction($name, $func) {
$this->libFunctions[$name] = $func;
}
public function unregisterFunction($name) {
unset($this->libFunctions[$name]);
}
// remove comments from $text
// todo: make it work for all functions, not just url
function removeComments($text) {
$look = array(
'url(', '//', '/*', '"', "'"
);
$out = '';
$min = null;
$done = false;
while (true) {
// find the next item
foreach ($look as $token) {
$pos = strpos($text, $token);
if ($pos !== false) {
if (!isset($min) || $pos < $min[1]) $min = array($token, $pos);
}
}
if (is_null($min)) break;
$count = $min[1];
$skip = 0;
$newlines = 0;
switch ($min[0]) {
case 'url(':
if (preg_match('/url\(.*?\)/', $text, $m, 0, $count))
$count += strlen($m[0]) - strlen($min[0]);
break;
case '"':
case "'":
if (preg_match('/'.$min[0].'.*?'.$min[0].'/', $text, $m, 0, $count))
$count += strlen($m[0]) - 1;
break;
case '//':
$skip = strpos($text, "\n", $count);
if ($skip === false) $skip = strlen($text) - $count;
else $skip -= $count;
break;
case '/*':
if (preg_match('/\/\*.*?\*\//s', $text, $m, 0, $count)) {
$skip = strlen($m[0]);
$newlines = substr_count($m[0], "\n");
}
break;
}
if ($skip == 0) $count += strlen($min[0]);
$out .= substr($text, 0, $count).str_repeat("\n", $newlines);
$text = substr($text, $count + $skip);
$min = null;
}
return $out.$text;
}
public function allParsedFiles() { return $this->allParsedFiles; }
protected function addParsedFile($file) {
$this->allParsedFiles[realpath($file)] = filemtime($file);
}
// compile file $in to file $out if $in is newer than $out
// returns true when it compiles, false otherwise
public static function ccompile($in, $out) {
if (!is_file($out) || filemtime($in) > filemtime($out)) {
$less = new lessc($in);
file_put_contents($out, $less->parse());
return true;
}
return false;
}
/**
* Execute lessphp on a .less file or a lessphp cache structure
*
* The lessphp cache structure contains information about a specific
* less file having been parsed. It can be used as a hint for future
* calls to determine whether or not a rebuild is required.
*
* The cache structure contains two important keys that may be used
* externally:
*
* compiled: The final compiled CSS
* updated: The time (in seconds) the CSS was last compiled
*
* The cache structure is a plain-ol' PHP associative array and can
* be serialized and unserialized without a hitch.
*
* @param mixed $in Input
* @param bool $force Force rebuild?
* @return array lessphp cache structure
*/
public static function cexecute($in, $force = false) {
// assume no root
$root = null;
if (is_string($in)) {
$root = $in;
} elseif (is_array($in) and isset($in['root'])) {
if ($force or ! isset($in['files'])) {
// If we are forcing a recompile or if for some reason the
// structure does not contain any file information we should
// specify the root to trigger a rebuild.
$root = $in['root'];
} elseif (isset($in['files']) and is_array($in['files'])) {
foreach ($in['files'] as $fname => $ftime ) {
if (!file_exists($fname) or filemtime($fname) > $ftime) {
// One of the files we knew about previously has changed
// so we should look at our incoming root again.
$root = $in['root'];
break;
}
}
}
} else {
// TODO: Throw an exception? We got neither a string nor something
// that looks like a compatible lessphp cache structure.
return null;
}
if ($root !== null) {
// If we have a root value which means we should rebuild.
$less = new lessc($root);
$out = array();
$out['root'] = $root;
$out['compiled'] = $less->parse();
$out['files'] = $less->allParsedFiles();
$out['updated'] = time();
return $out;
} else {
// No changes, pass back the structure
// we were given initially.
return $in;
}
}
static protected $cssColors = array(
'aliceblue' => '240,248,255',
'antiquewhite' => '250,235,215',
'aqua' => '0,255,255',
'aquamarine' => '127,255,212',
'azure' => '240,255,255',
'beige' => '245,245,220',
'bisque' => '255,228,196',
'black' => '0,0,0',
'blanchedalmond' => '255,235,205',
'blue' => '0,0,255',
'blueviolet' => '138,43,226',
'brown' => '165,42,42',
'burlywood' => '222,184,135',
'cadetblue' => '95,158,160',
'chartreuse' => '127,255,0',
'chocolate' => '210,105,30',
'coral' => '255,127,80',
'cornflowerblue' => '100,149,237',
'cornsilk' => '255,248,220',
'crimson' => '220,20,60',
'cyan' => '0,255,255',
'darkblue' => '0,0,139',
'darkcyan' => '0,139,139',
'darkgoldenrod' => '184,134,11',
'darkgray' => '169,169,169',
'darkgreen' => '0,100,0',
'darkgrey' => '169,169,169',
'darkkhaki' => '189,183,107',
'darkmagenta' => '139,0,139',
'darkolivegreen' => '85,107,47',
'darkorange' => '255,140,0',
'darkorchid' => '153,50,204',
'darkred' => '139,0,0',
'darksalmon' => '233,150,122',
'darkseagreen' => '143,188,143',
'darkslateblue' => '72,61,139',
'darkslategray' => '47,79,79',
'darkslategrey' => '47,79,79',
'darkturquoise' => '0,206,209',
'darkviolet' => '148,0,211',
'deeppink' => '255,20,147',
'deepskyblue' => '0,191,255',
'dimgray' => '105,105,105',
'dimgrey' => '105,105,105',
'dodgerblue' => '30,144,255',
'firebrick' => '178,34,34',
'floralwhite' => '255,250,240',
'forestgreen' => '34,139,34',
'fuchsia' => '255,0,255',
'gainsboro' => '220,220,220',
'ghostwhite' => '248,248,255',
'gold' => '255,215,0',
'goldenrod' => '218,165,32',
'gray' => '128,128,128',
'green' => '0,128,0',
'greenyellow' => '173,255,47',
'grey' => '128,128,128',
'honeydew' => '240,255,240',
'hotpink' => '255,105,180',
'indianred' => '205,92,92',
'indigo' => '75,0,130',
'ivory' => '255,255,240',
'khaki' => '240,230,140',
'lavender' => '230,230,250',
'lavenderblush' => '255,240,245',
'lawngreen' => '124,252,0',
'lemonchiffon' => '255,250,205',
'lightblue' => '173,216,230',
'lightcoral' => '240,128,128',
'lightcyan' => '224,255,255',
'lightgoldenrodyellow' => '250,250,210',
'lightgray' => '211,211,211',
'lightgreen' => '144,238,144',
'lightgrey' => '211,211,211',
'lightpink' => '255,182,193',
'lightsalmon' => '255,160,122',
'lightseagreen' => '32,178,170',
'lightskyblue' => '135,206,250',
'lightslategray' => '119,136,153',
'lightslategrey' => '119,136,153',
'lightsteelblue' => '176,196,222',
'lightyellow' => '255,255,224',
'lime' => '0,255,0',
'limegreen' => '50,205,50',
'linen' => '250,240,230',
'magenta' => '255,0,255',
'maroon' => '128,0,0',
'mediumaquamarine' => '102,205,170',
'mediumblue' => '0,0,205',
'mediumorchid' => '186,85,211',
'mediumpurple' => '147,112,219',
'mediumseagreen' => '60,179,113',
'mediumslateblue' => '123,104,238',
'mediumspringgreen' => '0,250,154',
'mediumturquoise' => '72,209,204',
'mediumvioletred' => '199,21,133',
'midnightblue' => '25,25,112',
'mintcream' => '245,255,250',
'mistyrose' => '255,228,225',
'moccasin' => '255,228,181',
'navajowhite' => '255,222,173',
'navy' => '0,0,128',
'oldlace' => '253,245,230',
'olive' => '128,128,0',
'olivedrab' => '107,142,35',
'orange' => '255,165,0',
'orangered' => '255,69,0',
'orchid' => '218,112,214',
'palegoldenrod' => '238,232,170',
'palegreen' => '152,251,152',
'paleturquoise' => '175,238,238',
'palevioletred' => '219,112,147',
'papayawhip' => '255,239,213',
'peachpuff' => '255,218,185',
'peru' => '205,133,63',
'pink' => '255,192,203',
'plum' => '221,160,221',
'powderblue' => '176,224,230',
'purple' => '128,0,128',
'red' => '255,0,0',
'rosybrown' => '188,143,143',
'royalblue' => '65,105,225',
'saddlebrown' => '139,69,19',
'salmon' => '250,128,114',
'sandybrown' => '244,164,96',
'seagreen' => '46,139,87',
'seashell' => '255,245,238',
'sienna' => '160,82,45',
'silver' => '192,192,192',
'skyblue' => '135,206,235',
'slateblue' => '106,90,205',
'slategray' => '112,128,144',
'slategrey' => '112,128,144',
'snow' => '255,250,250',
'springgreen' => '0,255,127',
'steelblue' => '70,130,180',
'tan' => '210,180,140',
'teal' => '0,128,128',
'thistle' => '216,191,216',
'tomato' => '255,99,71',
'turquoise' => '64,224,208',
'violet' => '238,130,238',
'wheat' => '245,222,179',
'white' => '255,255,255',
'whitesmoke' => '245,245,245',
'yellow' => '255,255,0',
'yellowgreen' => '154,205,50'
);
}