SelectorTest.php

<?php

declare(strict_types=1);

namespace Sabberworm\CSS\Tests\Unit\Property;

use PHPUnit\Framework\TestCase;
use Sabberworm\CSS\Comment\Comment;
use Sabberworm\CSS\Parsing\ParserState;
use Sabberworm\CSS\Parsing\UnexpectedTokenException;
use Sabberworm\CSS\Property\Selector;
use Sabberworm\CSS\Renderable;
use Sabberworm\CSS\Settings;
use TRegx\PhpUnit\DataProviders\DataProvider;

/**
 * @covers \Sabberworm\CSS\Property\Selector
 */
final class SelectorTest extends TestCase
{
    /**
     * @test
     */
    public function implementsRenderable(): void
    {
        $subject = new Selector('a');

        self::assertInstanceOf(Renderable::class, $subject);
    }

    /**
     * @test
     */
    public function getSelectorByDefaultReturnsSelectorProvidedToConstructor(): void
    {
        $selector = 'a';
        $subject = new Selector($selector);

        self::assertSame($selector, $subject->getSelector());
    }

    /**
     * @test
     */
    public function setSelectorOverwritesSelectorProvidedToConstructor(): void
    {
        $subject = new Selector('a');

        $selector = 'input';
        $subject->setSelector($selector);

        self::assertSame($selector, $subject->getSelector());
    }

    /**
     * @return array<non-empty-string, array{0: non-empty-string, 1: int<0, max>}>
     */
    public static function provideSelectorsAndSpecificities(): array
    {
        return [
            'type' => ['a', 1],
            'class' => ['.highlighted', 10],
            'type with class' => ['li.green', 11],
            'pseudo-class' => [':hover', 10],
            'type with pseudo-class' => ['a:hover', 11],
            'class with pseudo-class' => ['.help:hover', 20],
            'ID' => ['#file', 100],
            'ID and descendent class' => ['#test .help', 110],
            'type with ID' => ['h2#my-mug', 101],
            'pseudo-element' => ['::before', 1],
            'type with pseudo-element' => ['li::before', 2],
            'type and descendent type with pseudo-element' => ['ol li::before', 3],
            '`not`' => [':not(#your-mug)', 100],
            // TODO, broken: The specificity should be the highest of the `:not` arguments, not the sum.
            '`not` with multiple arguments' => [':not(#your-mug, .their-mug)', 110],
            'attribute with `"`' => ['[alt="{}()[]\\"\',"]', 10],
            'attribute with `\'`' => ['[alt=\'{}()[]"\\\',\']', 10],
        ];
    }

    /**
     * @return array<non-empty-string, array{0: non-empty-string}>
     */
    public static function provideSelectorsWithEscapedQuotes(): array
    {
        return [
            'escaped double quote in double-quoted attribute' => ['a[href="test\\"value"]'],
            'escaped single quote in single-quoted attribute' => ['a[href=\'test\\\'value\']'],
            'multiple escaped double quotes in double-quoted attribute' => ['a[title="say \\"hello\\" world"]'],
            'multiple escaped single quotes in single-quoted attribute' => ['a[title=\'say \\\'hello\\\' world\']'],
            'escaped quote at start of attribute value' => ['a[data-test="\\"start"]'],
            'escaped quote at end of attribute value' => ['a[data-test="end\\""]'],
            'escaped backslash followed by quote' => ['a[data-test="test\\\\"]'],
            'escaped backslash before escaped quote' => ['a[data-test="test\\\\\\"value"]'],
            'triple backslash before quote' => ['a[data-test="test\\\\\\""]'],
            'escaped single quotes in selector itself, with other escaped characters'
                => ['.before\\:content-\\[\\\'\\\'\\]:before'],
            'escaped double quotes in selector itself, with other escaped characters'
                => ['.before\\:content-\\[\\"\\"\\]:before'],
        ];
    }

    /**
     * @test
     *
     * @param non-empty-string $selector
     *
     * @dataProvider provideSelectorsAndSpecificities
     * @dataProvider provideSelectorsWithEscapedQuotes
     */
    public function parsesValidSelector(string $selector): void
    {
        $result = Selector::parse(new ParserState($selector, Settings::create()));

        self::assertInstanceOf(Selector::class, $result);
        self::assertSame($selector, $result->getSelector());
    }

    /**
     * @test
     */
    public function parsingAttributeWithEscapedQuoteDoesNotPrematurelyCloseString(): void
    {
        $selector = 'input[placeholder="Enter \\"quoted\\" text here"]';

        $result = Selector::parse(new ParserState($selector, Settings::create()));

        self::assertInstanceOf(Selector::class, $result);
        self::assertSame($selector, $result->getSelector());
    }

    /**
     * @test
     */
    public function parseDistinguishesEscapedFromUnescapedQuotes(): void
    {
        // One backslash = escaped quote (should not close string)
        $selector = 'a[data-value="test\\"more"]';

        $result = Selector::parse(new ParserState($selector, Settings::create()));

        self::assertSame($selector, $result->getSelector());
    }

    /**
     * @test
     */
    public function parseHandlesEvenNumberOfBackslashesBeforeQuote(): void
    {
        // Two backslashes = escaped backslash + unescaped quote (should close string)
        $selector = 'a[data-value="test\\\\"]';

        $result = Selector::parse(new ParserState($selector, Settings::create()));

        self::assertSame($selector, $result->getSelector());
    }

    /**
     * @return array<non-empty-string, array{0: string}>
     */
    public static function provideInvalidSelectors(): array
    {
        return [
            // This is currently broken.
            // 'empty string' => [''],
            'percent sign' => ['%'],
            // This is currently broken.
            // 'hash only' => ['#'],
            // This is currently broken.
            // 'dot only' => ['.'],
            'slash' => ['/'],
            'less-than sign' => ['<'],
            // This is currently broken.
            // 'whitespace only' => [" \t\n\r"],
        ];
    }

    /**
     * @return array<non-empty-string, array{0: string}>
     */
    public static function provideInvalidSelectorsForParse(): array
    {
        return [
            'empty string' => [''],
            'space' => [' '],
            'tab' => ["\t"],
            'line feed' => ["\n"],
            'carriage return' => ["\r"],
            'a `:not` missing the closing brace' => [':not(a'],
            'a `:not` missing the opening brace' => [':not a)'],
            'attribute value missing closing single quote' => ['a[href=\'#top]'],
            'attribute value missing closing double quote' => ['a[href="#top]'],
            'attribute value with mismatched quotes, single quote opening' => ['a[href=\'#top"]'],
            'attribute value with mismatched quotes, double quote opening' => ['a[href="#top\']'],
        ];
    }

    /**
     * @test
     *
     * @param non-empty-string $selector
     *
     * @dataProvider provideInvalidSelectors
     * @dataProvider provideInvalidSelectorsForParse
     */
    public function parseThrowsExceptionWithInvalidSelector(string $selector): void
    {
        $this->expectException(UnexpectedTokenException::class);

        Selector::parse(new ParserState($selector, Settings::create()));
    }

    /**
     * @return array<non-empty-string, array{0: non-empty-string}>
     */
    public static function provideStopCharacters(): array
    {
        return [
            ',' => [','],
            '{' => ['{'],
            '}' => ['}'],
        ];
    }

    /**
     * @return DataProvider<non-empty-string, array{0: non-empty-string, 1: non-empty-string}>
     */
    public function provideStopCharactersAndValidSelectors(): DataProvider
    {
        return DataProvider::cross(self::provideStopCharacters(), self::provideSelectorsAndSpecificities());
    }

    /**
     * @test
     *
     * @param non-empty-string $stopCharacter
     * @param non-empty-string $selector
     *
     * @dataProvider provideStopCharactersAndValidSelectors
     */
    public function parseDoesNotConsumeStopCharacter(string $stopCharacter, string $selector): void
    {
        $subject = new ParserState($selector . $stopCharacter, Settings::create());

        Selector::parse($subject);

        self::assertSame($stopCharacter, $subject->peek());
    }

    /**
     * @return array<non-empty-string, array{0: non-empty-string, 1: non-empty-string}>
     */
    public static function provideSelectorsWithAndWithoutComment(): array
    {
        return [
            'comment before' => ['/*comment*/body', 'body'],
            'comment after' => ['body/*comment*/', 'body'],
            'comment within' => ['./*comment*/teapot', '.teapot'],
            'comment within function' => [':not(#your-mug,/*comment*/.their-mug)', ':not(#your-mug,.their-mug)'],
        ];
    }

    /**
     * @test
     *
     * @param non-empty-string $selectorWith
     * @param non-empty-string $selectorWithout
     *
     * @dataProvider provideSelectorsWithAndWithoutComment
     */
    public function parsesSelectorWithComment(string $selectorWith, string $selectorWithout): void
    {
        $result = Selector::parse(new ParserState($selectorWith, Settings::create()));

        self::assertInstanceOf(Selector::class, $result);
        self::assertSame($selectorWithout, $result->getSelector());
    }

    /**
     * @test
     *
     * @param non-empty-string $selector
     *
     * @dataProvider provideSelectorsWithAndWithoutComment
     */
    public function parseExtractsCommentFromSelector(string $selector): void
    {
        $result = [];
        Selector::parse(new ParserState($selector, Settings::create()), $result);

        self::assertInstanceOf(Comment::class, $result[0]);
        self::assertSame('comment', $result[0]->getComment());
    }

    /**
     * @test
     */
    public function parsesSelectorWithTwoComments(): void
    {
        $result = Selector::parse(new ParserState('/*comment1*/a/*comment2*/', Settings::create()));

        self::assertInstanceOf(Selector::class, $result);
        self::assertSame('a', $result->getSelector());
    }

    /**
     * @test
     */
    public function parseExtractsTwoCommentsFromSelector(): void
    {
        $result = [];
        Selector::parse(new ParserState('/*comment1*/a/*comment2*/', Settings::create()), $result);

        self::assertInstanceOf(Comment::class, $result[0]);
        self::assertSame('comment1', $result[0]->getComment());
        self::assertInstanceOf(Comment::class, $result[1]);
        self::assertSame('comment2', $result[1]->getComment());
    }

    /**
     * @test
     *
     * @param non-empty-string $selector
     * @param int<0, max> $expectedSpecificity
     *
     * @dataProvider provideSelectorsAndSpecificities
     */
    public function getSpecificityByDefaultReturnsSpecificityOfSelectorProvidedToConstructor(
        string $selector,
        int $expectedSpecificity
    ): void {
        $subject = new Selector($selector);

        self::assertSame($expectedSpecificity, $subject->getSpecificity());
    }

    /**
     * @test
     *
     * @param non-empty-string $selector
     * @param int<0, max> $expectedSpecificity
     *
     * @dataProvider provideSelectorsAndSpecificities
     */
    public function getSpecificityReturnsSpecificityOfSelectorLastProvidedViaSetSelector(
        string $selector,
        int $expectedSpecificity
    ): void {
        $subject = new Selector('p');

        $subject->setSelector($selector);

        self::assertSame($expectedSpecificity, $subject->getSpecificity());
    }

    /**
     * @test
     *
     * @dataProvider provideSelectorsAndSpecificities
     * @dataProvider provideSelectorsWithEscapedQuotes
     */
    public function isValidForValidSelectorReturnsTrue(string $selector): void
    {
        self::assertTrue(Selector::isValid($selector));
    }

    /**
     * @test
     *
     * @dataProvider provideInvalidSelectors
     */
    public function isValidForInvalidSelectorReturnsFalse(string $selector): void
    {
        self::assertFalse(Selector::isValid($selector));
    }

    /**
     * @test
     */
    public function cleansUpSpacesWithinSelector(): void
    {
        $selector = 'p   >    small';

        $subject = new Selector($selector);

        self::assertSame('p > small', $subject->getSelector());
    }

    /**
     * @test
     */
    public function cleansUpTabsWithinSelector(): void
    {
        $selector = "p\t>\tsmall";

        $subject = new Selector($selector);

        self::assertSame('p > small', $subject->getSelector());
    }

    /**
     * @test
     */
    public function cleansUpNewLineWithinSelector(): void
    {
        $selector = "p\n>\nsmall";

        $subject = new Selector($selector);

        self::assertSame('p > small', $subject->getSelector());
    }


    /**
     * @test
     */
    public function doesNotCleanupSpacesWithinAttributeSelector(): void
    {
        $subject = new Selector('a[title="extra  space"]');

        self::assertSame('a[title="extra  space"]', $subject->getSelector());
    }

    /**
     * @test
     */
    public function getArrayRepresentationThrowsException(): void
    {
        $this->expectException(\BadMethodCallException::class);

        $subject = new Selector('a');

        $subject->getArrayRepresentation();
    }
}