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428 lines
14 KiB
428 lines
14 KiB
<?php
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/**
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* RTLCSS.
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*
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* @package MoodleHQ\RTLCSS
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* @copyright 2016 Frédéric Massart - FMCorz.net
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* @license https://opensource.org/licenses/MIT MIT
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*/
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namespace MoodleHQ\RTLCSS;
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use Sabberworm\CSS\CSSList\CSSList;
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use Sabberworm\CSS\CSSList\Document;
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use Sabberworm\CSS\OutputFormat;
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use Sabberworm\CSS\Parser;
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use Sabberworm\CSS\Rule\Rule;
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use Sabberworm\CSS\RuleSet\RuleSet;
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use Sabberworm\CSS\Settings;
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use Sabberworm\CSS\Value\CSSFunction;
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use Sabberworm\CSS\Value\CSSString;
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use Sabberworm\CSS\Value\PrimitiveValue;
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use Sabberworm\CSS\Value\RuleValueList;
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use Sabberworm\CSS\Value\Size;
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use Sabberworm\CSS\Value\ValueList;
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/**
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* RTLCSS Class.
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*
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* @package MoodleHQ\RTLCSS
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* @copyright 2016 Frédéric Massart - FMCorz.net
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* @license https://opensource.org/licenses/MIT MIT
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*/
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class RTLCSS {
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protected $tree;
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protected $shouldAddCss = [];
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protected $shouldIgnore = false;
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protected $shouldRemove = false;
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public function __construct(Document $tree) {
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$this->tree = $tree;
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}
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protected function compare($what, $to, $ignoreCase) {
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if ($ignoreCase) {
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return strtolower($what) === strtolower($to);
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}
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return $what === $to;
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}
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protected function complement($value) {
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if ($value instanceof Size) {
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$value->setSize(100 - $value->getSize());
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} else if ($value instanceof CSSFunction) {
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$arguments = implode($value->getListSeparator(), $value->getArguments());
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$arguments = "100% - ($arguments)";
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$value->setListComponents([$arguments]);
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}
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}
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public function flip() {
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$this->processBlock($this->tree);
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return $this->tree;
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}
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protected function negate($value) {
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if ($value instanceof ValueList) {
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foreach ($value->getListComponents() as $part) {
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$this->negate($part);
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}
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} else if ($value instanceof Size) {
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if ($value->getSize() != 0) {
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$value->setSize(-$value->getSize());
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}
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}
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}
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protected function parseComments(array $comments) {
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$startRule = '^(\s|\*)*!?rtl:';
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foreach ($comments as $comment) {
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$content = $comment->getComment();
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if (preg_match('/' . $startRule . 'ignore/', $content)) {
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$this->shouldIgnore = 1;
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} else if (preg_match('/' . $startRule . 'begin:ignore/', $content)) {
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$this->shouldIgnore = true;
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} else if (preg_match('/' . $startRule . 'end:ignore/', $content)) {
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$this->shouldIgnore = false;
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} else if (preg_match('/' . $startRule . 'remove/', $content)) {
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$this->shouldRemove = 1;
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} else if (preg_match('/' . $startRule . 'begin:remove/', $content)) {
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$this->shouldRemove = true;
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} else if (preg_match('/' . $startRule . 'end:remove/', $content)) {
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$this->shouldRemove = false;
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} else if (preg_match('/' . $startRule . 'raw:/', $content)) {
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$this->shouldAddCss[] = preg_replace('/' . $startRule . 'raw:/', '', $content);
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}
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}
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}
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protected function processBackground(Rule $rule) {
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$value = $rule->getValue();
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// TODO Fix upstream library as it does not parse this well, commas don't take precedence.
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// There can be multiple sets of properties per rule.
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$hasItems = false;
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$items = [$value];
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if ($value instanceof RuleValueList && $value->getListSeparator() == ',') {
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$hasItems = true;
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$items = $value->getListComponents();
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}
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// Foreach set.
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foreach ($items as $itemKey => $item) {
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// There can be multiple values in the same set.
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$hasValues = false;
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$parts = [$item];
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if ($item instanceof RuleValueList) {
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$hasValues = true;
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$parts = $value->getListComponents();
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}
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$requiresPositionalArgument = false;
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$hasPositionalArgument = false;
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foreach ($parts as $key => $part) {
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$part = $parts[$key];
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if (!is_object($part)) {
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$flipped = $this->swapLeftRight($part);
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// Positional arguments can have a size following.
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$hasPositionalArgument = $parts[$key] != $flipped;
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$requiresPositionalArgument = true;
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$parts[$key] = $flipped;
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continue;
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} else if ($part instanceof CSSFunction && strpos($part->getName(), 'gradient') !== false) {
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// TODO Fix this.
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} else if ($part instanceof Size && ($part->getUnit() === '%' || !$part->getUnit())) {
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// Is this a value we're interested in?
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if (!$requiresPositionalArgument || $hasPositionalArgument) {
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$this->complement($part);
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$part->setUnit('%');
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// We only need to change one value.
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break;
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}
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}
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$hasPositionalArgument = false;
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}
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if ($hasValues) {
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$item->setListComponents($parts);
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} else {
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$items[$itemKey] = $parts[$key];
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}
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}
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if ($hasItems) {
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$value->setListComponents($items);
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} else {
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$rule->setValue($items[0]);
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}
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}
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protected function processBlock($block) {
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$contents = [];
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foreach ($block->getContents() as $node) {
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$this->parseComments($node->getComments());
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if ($toAdd = $this->shouldAddCss()) {
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foreach ($toAdd as $add) {
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$parser = new Parser($add);
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$contents[] = $parser->parse();
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}
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}
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if ($this->shouldRemoveNext()) {
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continue;
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} else if (!$this->shouldIgnoreNext()) {
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if ($node instanceof CSSList) {
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$this->processBlock($node);
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}
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if ($node instanceof RuleSet) {
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$this->processDeclaration($node);
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}
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}
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$contents[] = $node;
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}
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$block->setContents($contents);
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}
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protected function processDeclaration($node) {
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$rules = [];
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foreach ($node->getRules() as $key => $rule) {
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$this->parseComments($rule->getComments());
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if ($toAdd = $this->shouldAddCss()) {
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foreach ($toAdd as $add) {
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$parser = new Parser('.wrapper{' . $add . '}');
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$tree = $parser->parse();
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$contents = $tree->getContents();
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foreach ($contents[0]->getRules() as $newRule) {
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$rules[] = $newRule;
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}
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}
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}
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if ($this->shouldRemoveNext()) {
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continue;
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} else if (!$this->shouldIgnoreNext()) {
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$this->processRule($rule);
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}
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$rules[] = $rule;
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}
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$node->setRules($rules);
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}
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protected function processRule($rule) {
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$property = $rule->getRule();
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$value = $rule->getValue();
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if (preg_match('/direction$/im', $property)) {
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$rule->setValue($this->swapLtrRtl($value));
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} else if (preg_match('/left/im', $property)) {
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$rule->setRule(str_replace('left', 'right', $property));
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} else if (preg_match('/right/im', $property)) {
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$rule->setRule(str_replace('right', 'left', $property));
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} else if (preg_match('/transition(-property)?$/i', $property)) {
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$rule->setValue($this->swapLeftRight($value));
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} else if (preg_match('/float|clear|text-align/i', $property)) {
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$rule->setValue($this->swapLeftRight($value));
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} else if (preg_match('/^(margin|padding|border-(color|style|width))$/i', $property)) {
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if ($value instanceof RuleValueList) {
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$values = $value->getListComponents();
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$count = count($values);
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if ($count == 4) {
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$right = $values[3];
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$values[3] = $values[1];
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$values[1] = $right;
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}
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$value->setListComponents($values);
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}
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} else if (preg_match('/border-radius/i', $property)) {
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if ($value instanceof RuleValueList) {
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// Border radius can contain two lists separated by a slash.
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$groups = $value->getListComponents();
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if ($value->getListSeparator() !== '/') {
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$groups = [$value];
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}
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foreach ($groups as $group) {
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$values = $group->getListComponents();
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switch (count($values)) {
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case 2:
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$group->setListComponents(array_reverse($values));
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break;
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case 3:
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$group->setListComponents([$values[1], $values[0], $values[1], $values[2]]);
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break;
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case 4:
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$group->setListComponents([$values[1], $values[0], $values[3], $values[2]]);
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break;
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}
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}
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}
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} else if (preg_match('/shadow/i', $property)) {
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// TODO Fix upstream, each shadow should be in a RuleValueList.
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if ($value instanceof RuleValueList) {
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// negate($value->getListComponents()[0]);
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}
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} else if (preg_match('/transform-origin/i', $property)) {
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$this->processTransformOrigin($rule);
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} else if (preg_match('/^(?!text\-).*?transform$/i', $property)) {
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// TODO Parse function parameters first.
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} else if (preg_match('/background(-position(-x)?|-image)?$/i', $property)) {
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$this->processBackground($rule);
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} else if (preg_match('/cursor/i', $property)) {
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$hasList = false;
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$parts = [$value];
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if ($value instanceof RuleValueList) {
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$hastList = true;
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$parts = $value->getListComponents();
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}
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foreach ($parts as $key => $part) {
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if (!is_object($part)) {
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$parts[$key] = preg_replace_callback('/\b(ne|nw|se|sw|nesw|nwse)-resize/', function($matches) {
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return str_replace($matches[1], str_replace(['e', 'w', '*'], ['*', 'e', 'w'], $matches[1]), $matches[0]);
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}, $part);
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}
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}
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if ($hasList) {
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$value->setListComponents($parts);
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} else {
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$rule->setValue($parts[0]);
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}
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}
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}
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protected function processTransformOrigin(Rule $rule) {
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$value = $rule->getValue();
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$foundLeftOrRight = false;
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// Search for left or right.
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$parts = [$value];
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if ($value instanceof RuleValueList) {
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$parts = $value->getListComponents();
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$isInList = true;
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}
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foreach ($parts as $key => $part) {
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if (!is_object($part) && preg_match('/left|right/i', $part)) {
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$foundLeftOrRight = true;
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$parts[$key] = $this->swapLeftRight($part);
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}
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}
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if ($foundLeftOrRight) {
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// We need to reconstruct the value because left/right are not represented by an object.
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$list = new RuleValueList(' ');
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$list->setListComponents($parts);
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$rule->setValue($list);
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} else {
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$value = $parts[0];
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// The first value may be referencing top or bottom (y instead of x).
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if (!is_object($value) && preg_match('/top|bottom/i', $value)) {
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$value = $parts[1];
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}
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// Flip the value.
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if ($value instanceof Size) {
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if ($value->getSize() == 0) {
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$value->setSize(100);
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$value->setUnit('%');
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} else if ($value->getUnit() === '%') {
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$this->complement($value);
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}
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} else if ($value instanceof CSSFunction && strpos($value->getName(), 'calc') !== false) {
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// TODO Fix upstream calc parsing.
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$this->complement($value);
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}
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}
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}
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protected function shouldAddCss() {
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if (!empty($this->shouldAddCss)) {
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$css = $this->shouldAddCss;
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$this->shouldAddCss = [];
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return $css;
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}
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return [];
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}
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protected function shouldIgnoreNext() {
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if ($this->shouldIgnore) {
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if (is_int($this->shouldIgnore)) {
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$this->shouldIgnore--;
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}
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return true;
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}
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return false;
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}
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protected function shouldRemoveNext() {
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if ($this->shouldRemove) {
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if (is_int($this->shouldRemove)) {
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$this->shouldRemove--;
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}
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return true;
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}
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return false;
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}
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protected function swap($value, $a, $b, $options = ['scope' => '*', 'ignoreCase' => true]) {
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$expr = preg_quote($a) . '|' . preg_quote($b);
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if (!empty($options['greedy'])) {
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$expr = '\\b(' . $expr . ')\\b';
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}
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$flags = !empty($options['ignoreCase']) ? 'im' : 'm';
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$expr = "/$expr/$flags";
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return preg_replace_callback($expr, function($matches) use ($a, $b, $options) {
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return $this->compare($matches[0], $a, !empty($options['ignoreCase'])) ? $b : $a;
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}, $value);
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}
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protected function swapLeftRight($value) {
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return $this->swap($value, 'left', 'right');
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}
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protected function swapLtrRtl($value) {
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return $this->swap($value, 'ltr', 'rtl');
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}
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}
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