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convert.php
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convert.php
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<?php
class CssToSassConverter {
public function convert ($css) {
$selectors = $this->getSelectors($css);
$statementBlocks = $this->getStatementBlocks($css);
$SASS = $this->buildSass($selectors, $statementBlocks);
return $SASS;
}
private function getNtabs($n) {
$tabs = '';
for ($i = $n; $i > 0; $i--) {
$tabs = $tabs . " ";
}
return $tabs;
}
private function buildSass($selectors, $statementBlocks, $SASS = '', $originalSelectorString = '', $level = 0) {
foreach($selectors as $selector => $children) {
$selectorString = $originalSelectorString . ' ' . $selector;
$SASS = $SASS . "\n\n" . $this->getNtabs($level) . $selector . " {\n";
$css = $this->getCssForThisSelector($statementBlocks, $selectorString);
if (strlen($css) > 0) {
$css = $this->getNtabs($level + 1) . str_replace("\n", "\n" . $this->getNtabs($level + 1), $css);
}
$SASS = $SASS . $css;
if (count($children) > 0) {
$SASS = $this->buildSass($children, $statementBlocks, $SASS, $selectorString, ($level + 1));
$SASS = $SASS . "\n" . $this->getNtabs($level) . "}";
} else {
$SASS = $SASS . "\n" . $this->getNtabs($level) . "}";
}
}
return $SASS;
}
private function getCssForThisSelector($statementBlocks, $selectorString) {
$selectorString = trim($selectorString);
$css = "";
foreach($statementBlocks as $block) {
preg_match_all('/\s*' . $selectorString . '\s*{([^}]*)/im', $block, $tmp);
if (count($tmp[1]) > 0) {
// mutliple blocks applying to the same selector, need to separate them
if ($css !== '') {
$css = $css . "\n";
}
$css = $css . trim($tmp[1][0]);
}
}
return $css;
}
public function getStatementBlocks ($css) {
preg_match_all('/([0-9a-zA-Z#: \.\-_]+{([^}]*))/im', $css, $statementBlocks);
for ($i = 0; $i < count($statementBlocks[0]); $i++) {
$statementBlocks[0][$i] = $statementBlocks[0][$i] . '}';
}
$statementBlocks = $statementBlocks[0];
// trim each line
for($i = 0; $i < count($statementBlocks); $i++) {
$statementBlocks[$i] = implode("\n", array_map('trim', explode("\n", $statementBlocks[$i])));
}
return $statementBlocks;
}
public function getSelectors ($css) {
preg_match_all('/([0-9a-zA-Z#: \.\-_]+){[^}]*/im', $css, $selectors);
$selectors = $selectors[1];
// remove whitespace from the ends
for($i = 0; $i < count($selectors); $i++) {
$selectors[$i] = trim($selectors[$i]);
}
$selectorsToReturn = $this->convertSelectorsToNestedArray($selectors);
return $selectorsToReturn;
}
/*
Convert
array(
".foo .bar",
".foo .bar p",
".foo h1"
)
to
array(
"foo" => array(
"bar" => array(
"p" => array()
),
"h1" => array()
)
)
*/
private function convertSelectorsToNestedArray ($selectors) {
$nestedArray = array();
for ($i = 0; $i < count($selectors); $i++) {
$selectorChunks = explode(" ", $selectors[$i]);
$tmpArray = &$nestedArray;
foreach ($selectorChunks as $chunk) {
// if chunk contains ':' character
// if parent selector exists at this level
// rename this to &:... and make it a child of that
// else
// assume we only ever want to target the : modifier, so just make it its own array
// @TODO - we should reorder selectors before passing to this function, so that
// top level selectors come first (i.e. h1, p, etc) and nested selectors come lower,
// with modifier (':') selectors coming last.
// otherwise the above pseudocode will not work - you could have a block
// .something:last-child
// followed by a block
// .something
// and it would be too late - the compiler will have assumed that :last-child was the only
// modifier of .something we want to target.
// would be pointless for the compiler to output:
/*
.something {
&:last-child {
// something
}
}
*/
if (!$tmpArray[$chunk]) {
$tmpArray[$chunk] = array();
}
$tmpArray = &$tmpArray[$chunk];
}
unset($tmpArray);
}
return $nestedArray;
}
}