Lexer::lexNumber() - Code Metrics - Inspection of "Lexer optimizations" - digiaonline/graphql-php - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#196)

by Christoffer

created 2018-04-11 08:13 UTC

Lexer::lexNumber() C

↳ Parent: Lexer

Complexity

Conditions	10
Paths	26

Size

Total Lines	55
Code Lines	31

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	55
rs	6.8372
c	0
b	0
f	0
cc	10
eloc	31
nc	26
nop	4

How to fix Long Method Complexity

<?php

namespace Digia\GraphQL\Language;

use Digia\GraphQL\Error\SyntaxErrorException;

class Lexer implements LexerInterface
{
    protected const ENCODING = 'UTF-8';

    /**
     * A map between punctuation character code and the corresponding token kind.
     *
     * @var array
     */
    protected static $codeTokenKindMap = [
        33  => TokenKindEnum::BANG,
        36  => TokenKindEnum::DOLLAR,
        38  => TokenKindEnum::AMP,
        40  => TokenKindEnum::PAREN_L,
        41  => TokenKindEnum::PAREN_R,
        58  => TokenKindEnum::COLON,
        61  => TokenKindEnum::EQUALS,
        64  => TokenKindEnum::AT,
        91  => TokenKindEnum::BRACKET_L,
        93  => TokenKindEnum::BRACKET_R,
        123 => TokenKindEnum::BRACE_L,
        124 => TokenKindEnum::PIPE,
        125 => TokenKindEnum::BRACE_R,
    ];

    /**
     * The source file for this lexer.
     *
     * @var Source
     */
    protected $source;

    /**
     * The contents of the source file.
     *
     * @var string
     */
    protected $body;

    /**
     * The total number of characters in the source file.
     *
     * @var int
     */
    protected $bodyLength;

    /**
     * The options for this lexer.
     *
     * @var array
     */
    protected $options = [];

    /**
     * The previously focused non-ignored token.
     *
     * @var Token
     */
    protected $lastToken;

    /**
     * The currently focused non-ignored token.
     *
     * @var Token
     */
    protected $token;

    /**
     * The current position.
     *
     * @var int
     */
    protected $pos;

    /**
     * The (1-indexed) line containing the current token.
     *
     * @var int
     */
    protected $line;

    /**
     * The character offset at which the current line begins.
     *
     * @var int
     */
    protected $lineStart;

    /**
     * @var array
     */
    protected static $charCodeCache = [];

    /**
     * Lexer constructor.
     * @param Source|null $source
     * @param array       $options
     */
    public function __construct(Source $source, array $options)
    {
        $startOfFileToken = $this->createStartOfFileToken();

        $this->lastToken  = $startOfFileToken;
        $this->token      = $startOfFileToken;
        $this->line       = 1;
        $this->lineStart  = 0;
        $this->body       = $source->getBody();
        $this->bodyLength = \strlen($this->body);
        $this->source     = $source;
        $this->options    = $options;
    }

    /**
     * @inheritdoc
     * @throws SyntaxErrorException
     */
    public function advance(): Token
    {
        $this->lastToken = $this->token;
        return $this->token = $this->lookahead();
    }

    /**
     * @inheritdoc
     * @throws SyntaxErrorException
     */
    public function lookahead(): Token
    {
        $token = $this->token;

        if (TokenKindEnum::EOF !== $token->getKind()) {
            do {
                $next = $this->readToken($token);
                $token->setNext($next);
                $token = $next;
            } while (TokenKindEnum::COMMENT === $token->getKind());
        }

        return $token;
    }

    /**
     * @inheritdoc
     */
    public function getOption(string $name, $default = null)
    {
        return $this->options[$name] ?? $default;
    }

    /**
     * @inheritdoc
     */
    public function getTokenKind(): string
    {
        return $this->token->getKind();
    }

    /**
     * @inheritdoc
     */
    public function getTokenValue(): ?string
    {
        return $this->token->getValue();
    }

    /**
     * @inheritdoc
     */
    public function getToken(): Token
    {
        return $this->token;
    }

    /**
     * @inheritdoc
     */
    public function getSource(): Source
    {
        return $this->source;
    }

    /**
     * @inheritdoc
     */
    public function getLastToken(): Token
    {
        return $this->lastToken;
    }

    /**
     * @inheritdoc
     */
    public function createSyntaxErrorException(?string $description = null): SyntaxErrorException
    {
        return new SyntaxErrorException(
            $this->source,
            $this->pos,
            $description ?? $this->unexpectedCharacterMessage($this->readCharCode($this->pos))
        );
    }

    /**
     * Reads the token after the given token.
     *
     * @param Token $prev
     * @return Token
     * @throws SyntaxErrorException
     */
    protected function readToken(Token $prev): Token
    {
        $this->pos = $prev->getEnd();

        $this->skipWhitespace();

        $line = $this->line;
        $col  = (1 + $this->pos) - $this->lineStart;

        if ($this->pos >= $this->bodyLength) {
            return $this->createEndOfFileToken($line, $col, $prev);
        }

        $code = $this->readCharCode($this->pos);

        // Punctuation: [!$&:=@|()\[\]{}]{1}
        if (33 === $code || 36 === $code || 38 === $code || 58 === $code || 61 === $code || 64 === $code || 124 === $code ||
            40 === $code || 41 === $code || 91 === $code || 93 === $code || 123 === $code || 125 === $code) {
            return $this->lexPunctuation($code, $line, $col, $prev);
        }

        // Comment: #[\u0009\u0020-\uFFFF]*
        if (35 === $code) {
            return $this->lexComment($line, $col, $prev);
        }

        // Int:   -?(0|[1-9][0-9]*)
        // Float: -?(0|[1-9][0-9]*)(\.[0-9]+)?((E|e)(+|-)?[0-9]+)?
        if (45 === $code || isNumber($code)) {
            return $this->lexNumber($code, $line, $col, $prev);
        }

        // Name: [_A-Za-z][_0-9A-Za-z]*
        if (isAlphaNumeric($code)) {
            return $this->lexName($line, $col, $prev);
        }

        // Spread: ...
        if ($this->bodyLength >= 3 && $this->isSpread($code)) {
            return $this->lexSpread($line, $col, $prev);
        }

        // String: "([^"\\\u000A\u000D]|(\\(u[0-9a-fA-F]{4}|["\\/bfnrt])))*"
        if ($this->isString($code)) {
            return $this->lexString($line, $col, $prev);
        }

        // Block String: """("?"?(\\"""|\\(?!=""")|[^"\\]))*"""
        if ($this->bodyLength >= 3 && $this->isTripleQuote($code)) {
            return $this->lexBlockString($line, $col, $prev);
        }

        throw $this->createSyntaxErrorException();
    }

    /**
     * @return Token
     */
    protected function createStartOfFileToken(): Token
    {
        return new Token(TokenKindEnum::SOF);
    }

    /**
     * Creates an End Of File (EOF) token.
     *
     * @param int   $line
     * @param int   $col
     * @param Token $prev
     * @return Token
     */
    protected function createEndOfFileToken(int $line, int $col, Token $prev): Token
    {
        return new Token(TokenKindEnum::EOF, $this->bodyLength, $this->bodyLength, $line, $col, $prev);
    }

    /**
     * Reads a punctuation token from the source file.
     *
     * @param int   $code
     * @param int   $line
     * @param int   $col
     * @param Token $prev
     * @return Token
     * @throws SyntaxErrorException
     */
    protected function lexPunctuation(int $code, int $line, int $col, Token $prev): ?Token
    {
        if (!isset(self::$codeTokenKindMap[$code])) {
            throw $this->createSyntaxErrorException();
        }

        return new Token(self::$codeTokenKindMap[$code], $this->pos, $this->pos + 1, $line, $col, $prev);
    }

    /**
     * Reads a name token from the source file.
     *
     * @param int   $line
     * @param int   $col
     * @param Token $prev
     * @return Token
     */
    protected function lexName(int $line, int $col, Token $prev): Token
    {
        $start = $this->pos;

        ++$this->pos;

        while ($this->pos !== $this->bodyLength &&
            ($code = $this->readCharCode($this->pos)) !== null &&
            isAlphaNumeric($code)) {
            ++$this->pos;
        }

        $value = sliceString($this->body, $start, $this->pos);

        return new Token(TokenKindEnum::NAME, $start, $this->pos, $line, $col, $prev, $value);
    }

    /**
     * Reads a number (int or float) token from the source file.
     *
     * @param int   $code
     * @param int   $line
     * @param int   $col
     * @param Token $prev
     * @return Token
     * @throws SyntaxErrorException
     */
    protected function lexNumber(int $code, int $line, int $col, Token $prev): Token
    {
        $start   = $this->pos;
        $isFloat = false;

        if (45 === $code) {
            // -
            $code = $this->readCharCode(++$this->pos);
        }

        if (48 === $code) {
            // 0
            $code = $this->readCharCode(++$this->pos);

            if (isNumber($code)) {
                throw $this->createSyntaxErrorException(
                    \sprintf('Invalid number, unexpected digit after 0: %s.', printCharCode($code))
                );
            }
        } else {
            $this->skipDigits($code);
            $code = $this->readCharCode($this->pos);
        }

        if (46 === $code) {
            // .
            $isFloat = true;

            $code = $this->readCharCode(++$this->pos);
            $this->skipDigits($code);
            $code = $this->readCharCode($this->pos);
        }

        if (69 === $code || 101 === $code) {
            // e or E
            $isFloat = true;

            $code = $this->readCharCode(++$this->pos);

            if (43 === $code || 45 === $code) {
                // + or -
                $code = $this->readCharCode(++$this->pos);
            }

            $this->skipDigits($code);
        }

        return new Token(
            $isFloat ? TokenKindEnum::FLOAT : TokenKindEnum::INT,
            $start,
            $this->pos,
            $line,
            $col,
            $prev,
            sliceString($this->body, $start, $this->pos)
        );
    }

    /**
     * Skips digits at the current position.
     *
     * @param int $code
     * @throws SyntaxErrorException
     */
    protected function skipDigits(int $code): void
    {
        if (isNumber($code)) {
            do {
                $code = $this->readCharCode(++$this->pos);
            } while (isNumber($code));

            return;
        }

        throw $this->createSyntaxErrorException(
            \sprintf('Invalid number, expected digit but got: %s.', printCharCode($code))
        );
    }

    /**
     * Reads a comment token from the source file.
     *
     * @param int   $line
     * @param int   $col
     * @param Token $prev
     * @return Token
     */
    protected function lexComment(int $line, int $col, Token $prev): Token
    {
        $start = $this->pos;

        do {
            $code = $this->readCharCode(++$this->pos);
        } while ($code !== null && ($code > 0x001f || 0x0009 === $code)); // SourceCharacter but not LineTerminator

        return new Token(
            TokenKindEnum::COMMENT,
            $start,
            $this->pos,
            $line,
            $col,
            $prev,
            sliceString($this->body, $start + 1, $this->pos)
        );
    }

    /**
     * Reads a spread token from the source.
     *
     * @param int   $line
     * @param int   $col
     * @param Token $prev
     * @return Token
     */
    protected function lexSpread(int $line, int $col, Token $prev): Token
    {
        return new Token(TokenKindEnum::SPREAD, $this->pos, $this->pos + 3, $line, $col, $prev);
    }

    /**
     * Reads a string token from the source.
     *
     * @param int   $line
     * @param int   $col
     * @param Token $prev
     * @return Token
     * @throws SyntaxErrorException
     */
    protected function lexString(int $line, int $col, Token $prev): Token
    {
        $start      = $this->pos;
        $chunkStart = ++$this->pos; // skip the quote
        $value      = '';

        while ($this->pos < $this->bodyLength &&
            ($code = $this->readCharCode($this->pos)) !== null && !isLineTerminator($code)) {
            // Closing Quote (")
            if (34 === $code) {
                $value .= sliceString($this->body, $chunkStart, $this->pos);
                return new Token(TokenKindEnum::STRING, $start, $this->pos + 1, $line, $col, $prev, $value);
            }

            if (isSourceCharacter($code)) {
                throw $this->createSyntaxErrorException(
                    \sprintf('Invalid character within String: %s.', printCharCode($code))
                );
            }

            ++$this->pos;

            if (92 === $code) {
                // \
                $value .= sliceString($this->body, $chunkStart, $this->pos - 1);

                $code = $this->readCharCode($this->pos);

                switch ($code) {
                    case 34: // "
                        $value .= '"';
                        break;
                    case 47: // /
                        $value .= '/';
                        break;
                    case 92: // \
                        $value .= '\\';
                        break;
                    case 98: // b
                        $value .= '\b';
                        break;
                    case 102: // f
                        $value .= '\f';
                        break;
                    case 110: // n
                        $value .= '\n';
                        break;
                    case 114: // r
                        $value .= '\r';
                        break;
                    case 116: // t
                        $value .= '\t';
                        break;
                    case 117: // u
                        $unicodeString = sliceString($this->body, $this->pos + 1, $this->pos + 5);

                        if (!\preg_match('/[0-9A-Fa-f]{4}/', $unicodeString)) {
                            throw $this->createSyntaxErrorException(
                                \sprintf('Invalid character escape sequence: \\u%s.', $unicodeString)
                            );
                        }

                        $value     .= '\\u' . $unicodeString;
                        $this->pos += 4;

                        break;
                    default:
                        throw $this->createSyntaxErrorException(
                            \sprintf('Invalid character escape sequence: \\%s.', \chr($code))
                        );
                }

                ++$this->pos;

                $chunkStart = $this->pos;
            }
        }

        throw $this->createSyntaxErrorException('Unterminated string.');
    }

    /**
     * Reads a block string token from the source file.
     *
     * @param int   $line
     * @param int   $col
     * @param Token $prev
     * @return Token
     * @throws SyntaxErrorException
     */
    protected function lexBlockString(int $line, int $col, Token $prev): Token
    {
        $start      = $this->pos;
        $this->pos  = $start + 3; // skip the triple-quote
        $chunkStart = $this->pos;
        $rawValue   = '';

        while ($this->pos < $this->bodyLength && ($code = $this->readCharCode($this->pos)) !== null) {
            // Closing Triple-Quote (""")
            if ($this->isTripleQuote($code)) {
                $rawValue .= sliceString($this->body, $chunkStart, $this->pos);
                return new Token(
                    TokenKindEnum::BLOCK_STRING,
                    $start,
                    $this->pos + 3,
                    $line,
                    $col,
                    $prev,
                    blockStringValue($rawValue)
                );
            }

            if (isSourceCharacter($code) && !isLineTerminator($code)) {
                throw $this->createSyntaxErrorException(
                    \sprintf('Invalid character within String: %s.', printCharCode($code))
                );
            }

            if ($this->isEscapedTripleQuote($code)) {
                $rawValue   .= sliceString($this->body, $chunkStart, $this->pos) . '"""';
                $this->pos  += 4;
                $chunkStart = $this->pos;
            } else {
                ++$this->pos;
            }
        }

        throw $this->createSyntaxErrorException('Unterminated string.');
    }

    /**
     * Skips whitespace at the current position.
     */
    protected function skipWhitespace(): void
    {
        while ($this->pos < $this->bodyLength) {
            $code = $this->readCharCode($this->pos);

            if (9 === $code || 32 === $code || 44 === $code || 0xfeff === $code) {
                // tab | space | comma | BOM
                ++$this->pos;
            } elseif (10 === $code) {
                // new line (\n)
                ++$this->pos;
                ++$this->line;
                $this->lineStart = $this->pos;
            } elseif (13 === $code) {
                // carriage return (\r)
                if (10 === $this->readCharCode($this->pos + 1)) {
                    // carriage return and new line (\r\n)
                    $this->pos += 2;
                } else {
                    ++$this->pos;
                }
                ++$this->line;
                $this->lineStart = $this->pos;
            } else {
                break;
            }
        }
    }

    /**
     * @param int $pos
     * @return int
     */
    protected function readCharCode(int $pos): int
    {
        $char = \mb_substr($this->body, $pos, 1, self::ENCODING);

        if ('' === $char) {
            return 0;
        }

        if (!isset(self::$charCodeCache[$char])) {
            self::$charCodeCache[$char] = \mb_ord($char, self::ENCODING);
        }

        return self::$charCodeCache[$char];
    }

    /**
     * Report a message that an unexpected character was encountered.
     *
     * @param int $code
     * @return string
     */
    protected function unexpectedCharacterMessage(int $code): string
    {
        if (isSourceCharacter($code) && !isLineTerminator($code)) {
            return \sprintf('Cannot contain the invalid character %s.', printCharCode($code));
        }

        if ($code === 39) {
            // '
            return 'Unexpected single quote character (\'), did you mean to use a double quote (")?';
        }

        return \sprintf('Cannot parse the unexpected character %s.', printCharCode($code));
    }

    /**
     * @param int $code
     * @return bool
     */
    protected function isSpread(int $code): bool
    {
        return 46 === $code &&
            $this->readCharCode($this->pos + 1) === 46 &&
            $this->readCharCode($this->pos + 2) === 46; // ...
    }

    /**
     * @param int $code
     * @return bool
     */
    protected function isString(int $code): bool
    {
        return 34 === $code && $this->readCharCode($this->pos + 1) !== 34;
    }

    /**
     * @param int $code
     * @return bool
     */
    protected function isTripleQuote(int $code): bool
    {
        return 34 === $code &&
            34 === $this->readCharCode($this->pos + 1) &&
            34 === $this->readCharCode($this->pos + 2); // """
    }

    /**
     * @param int $code
     * @return bool
     */
    protected function isEscapedTripleQuote(int $code): bool
    {
        return $code === 92 &&
            34 === $this->readCharCode($this->pos + 1) &&
            34 === $this->readCharCode($this->pos + 2) &&
            34 === $this->readCharCode($this->pos + 3); // \"""
    }
}


1			<?php
2
3			namespace Digia\GraphQL\Language;
4
5			use Digia\GraphQL\Error\SyntaxErrorException;
6
7			class Lexer implements LexerInterface
8			{
9			protected const ENCODING = 'UTF-8';
10
11			/**
12			* A map between punctuation character code and the corresponding token kind.
13			*
14			* @var array
15			*/
16			protected static $codeTokenKindMap = [
17			33 => TokenKindEnum::BANG,
18			36 => TokenKindEnum::DOLLAR,
19			38 => TokenKindEnum::AMP,
20			40 => TokenKindEnum::PAREN_L,
21			41 => TokenKindEnum::PAREN_R,
22			58 => TokenKindEnum::COLON,
23			61 => TokenKindEnum::EQUALS,
24			64 => TokenKindEnum::AT,
25			91 => TokenKindEnum::BRACKET_L,
26			93 => TokenKindEnum::BRACKET_R,
27			123 => TokenKindEnum::BRACE_L,
28			124 => TokenKindEnum::PIPE,
29			125 => TokenKindEnum::BRACE_R,
30			];
31
32			/**
33			* The source file for this lexer.
34			*
35			* @var Source
36			*/
37			protected $source;
38
39			/**
40			* The contents of the source file.
41			*
42			* @var string
43			*/
44			protected $body;
45
46			/**
47			* The total number of characters in the source file.
48			*
49			* @var int
50			*/
51			protected $bodyLength;
52
53			/**
54			* The options for this lexer.
55			*
56			* @var array
57			*/
58			protected $options = [];
59
60			/**
61			* The previously focused non-ignored token.
62			*
63			* @var Token
64			*/
65			protected $lastToken;
66
67			/**
68			* The currently focused non-ignored token.
69			*
70			* @var Token
71			*/
72			protected $token;
73
74			/**
75			* The current position.
76			*
77			* @var int
78			*/
79			protected $pos;
80
81			/**
82			* The (1-indexed) line containing the current token.
83			*
84			* @var int
85			*/
86			protected $line;
87
88			/**
89			* The character offset at which the current line begins.
90			*
91			* @var int
92			*/
93			protected $lineStart;
94
95			/**
96			* @var array
97			*/
98			protected static $charCodeCache = [];
99
100			/**
101			* Lexer constructor.
102			* @param Source\|null $source
103			* @param array $options
104			*/
105			public function __construct(Source $source, array $options)
106			{
107			$startOfFileToken = $this->createStartOfFileToken();
108
109			$this->lastToken = $startOfFileToken;
110			$this->token = $startOfFileToken;
111			$this->line = 1;
112			$this->lineStart = 0;
113			$this->body = $source->getBody();
114			$this->bodyLength = \strlen($this->body);
115			$this->source = $source;
116			$this->options = $options;
117			}
118
119			/**
120			* @inheritdoc
121			* @throws SyntaxErrorException
122			*/
123			public function advance(): Token
124			{
125			$this->lastToken = $this->token;
126			return $this->token = $this->lookahead();
127			}
128
129			/**
130			* @inheritdoc
131			* @throws SyntaxErrorException
132			*/
133			public function lookahead(): Token
134			{
135			$token = $this->token;
136
137			if (TokenKindEnum::EOF !== $token->getKind()) {
138			do {
139			$next = $this->readToken($token);
140			$token->setNext($next);
141			$token = $next;
142			} while (TokenKindEnum::COMMENT === $token->getKind());
143			}
144
145			return $token;
146			}
147
148			/**
149			* @inheritdoc
150			*/
151			public function getOption(string $name, $default = null)
152			{
153			return $this->options[$name] ?? $default;
154			}
155
156			/**
157			* @inheritdoc
158			*/
159			public function getTokenKind(): string
160			{
161			return $this->token->getKind();
162			}
163
164			/**
165			* @inheritdoc
166			*/
167			public function getTokenValue(): ?string
168			{
169			return $this->token->getValue();
170			}
171
172			/**
173			* @inheritdoc
174			*/
175			public function getToken(): Token
176			{
177			return $this->token;
178			}
179
180			/**
181			* @inheritdoc
182			*/
183			public function getSource(): Source
184			{
185			return $this->source;
186			}
187
188			/**
189			* @inheritdoc
190			*/
191			public function getLastToken(): Token
192			{
193			return $this->lastToken;
194			}
195
196			/**
197			* @inheritdoc
198			*/
199			public function createSyntaxErrorException(?string $description = null): SyntaxErrorException
200			{
201			return new SyntaxErrorException(
202			$this->source,
203			$this->pos,
204			$description ?? $this->unexpectedCharacterMessage($this->readCharCode($this->pos))
205			);
206			}
207
208			/**
209			* Reads the token after the given token.
210			*
211			* @param Token $prev
212			* @return Token
213			* @throws SyntaxErrorException
214			*/
215			protected function readToken(Token $prev): Token
216			{
217			$this->pos = $prev->getEnd();
218
219			$this->skipWhitespace();
220
221			$line = $this->line;
222			$col = (1 + $this->pos) - $this->lineStart;
223
224			if ($this->pos >= $this->bodyLength) {
225			return $this->createEndOfFileToken($line, $col, $prev);
226			}
227
228			$code = $this->readCharCode($this->pos);
229
230			// Punctuation: [!$&:=@\|()\[\]{}]{1}
231			if (33 === $code \|\| 36 === $code \|\| 38 === $code \|\| 58 === $code \|\| 61 === $code \|\| 64 === $code \|\| 124 === $code \|\|
232			40 === $code \|\| 41 === $code \|\| 91 === $code \|\| 93 === $code \|\| 123 === $code \|\| 125 === $code) {
233			return $this->lexPunctuation($code, $line, $col, $prev);
234			}
235
236			// Comment: #[\u0009\u0020-\uFFFF]*
237			if (35 === $code) {
238			return $this->lexComment($line, $col, $prev);
239			}
240
241			// Int: -?(0\|[1-9][0-9]*)
242			// Float: -?(0\|[1-9][0-9]*)(\.[0-9]+)?((E\|e)(+\|-)?[0-9]+)?
243			if (45 === $code \|\| isNumber($code)) {
244			return $this->lexNumber($code, $line, $col, $prev);
245			}
246
247			// Name: [_A-Za-z][_0-9A-Za-z]*
248			if (isAlphaNumeric($code)) {
249			return $this->lexName($line, $col, $prev);
250			}
251
252			// Spread: ...
253			if ($this->bodyLength >= 3 && $this->isSpread($code)) {
254			return $this->lexSpread($line, $col, $prev);
255			}
256
257			// String: "([^"\\\u000A\u000D]\|(\\(u[0-9a-fA-F]{4}\|["\\/bfnrt])))*"
258			if ($this->isString($code)) {
259			return $this->lexString($line, $col, $prev);
260			}
261
262			// Block String: """("?"?(\\"""\|\\(?!=""")\|[^"\\]))*"""
263			if ($this->bodyLength >= 3 && $this->isTripleQuote($code)) {
264			return $this->lexBlockString($line, $col, $prev);
265			}
266
267			throw $this->createSyntaxErrorException();
268			}
269
270			/**
271			* @return Token
272			*/
273			protected function createStartOfFileToken(): Token
274			{
275			return new Token(TokenKindEnum::SOF);
276			}
277
278			/**
279			* Creates an End Of File (EOF) token.
280			*
281			* @param int $line
282			* @param int $col
283			* @param Token $prev
284			* @return Token
285			*/
286			protected function createEndOfFileToken(int $line, int $col, Token $prev): Token
287			{
288			return new Token(TokenKindEnum::EOF, $this->bodyLength, $this->bodyLength, $line, $col, $prev);
289			}
290
291			/**
292			* Reads a punctuation token from the source file.
293			*
294			* @param int $code
295			* @param int $line
296			* @param int $col
297			* @param Token $prev
298			* @return Token
299			* @throws SyntaxErrorException
300			*/
301			protected function lexPunctuation(int $code, int $line, int $col, Token $prev): ?Token
302			{
303			if (!isset(self::$codeTokenKindMap[$code])) {
304			throw $this->createSyntaxErrorException();
305			}
306
307			return new Token(self::$codeTokenKindMap[$code], $this->pos, $this->pos + 1, $line, $col, $prev);
308			}
309
310			/**
311			* Reads a name token from the source file.
312			*
313			* @param int $line
314			* @param int $col
315			* @param Token $prev
316			* @return Token
317			*/
318			protected function lexName(int $line, int $col, Token $prev): Token
319			{
320			$start = $this->pos;
321
322			++$this->pos;
323
324			while ($this->pos !== $this->bodyLength &&
325			($code = $this->readCharCode($this->pos)) !== null &&
326			isAlphaNumeric($code)) {
327			++$this->pos;
328			}
329
330			$value = sliceString($this->body, $start, $this->pos);
331
332			return new Token(TokenKindEnum::NAME, $start, $this->pos, $line, $col, $prev, $value);
333			}
334
335			/**
336			* Reads a number (int or float) token from the source file.
337			*
338			* @param int $code
339			* @param int $line
340			* @param int $col
341			* @param Token $prev
342			* @return Token
343			* @throws SyntaxErrorException
344			*/
345			protected function lexNumber(int $code, int $line, int $col, Token $prev): Token
346			{
347			$start = $this->pos;
348			$isFloat = false;
349
350			if (45 === $code) {
351			// -
352			$code = $this->readCharCode(++$this->pos);
353			}
354
355			if (48 === $code) {
356			// 0
357			$code = $this->readCharCode(++$this->pos);
358
359			if (isNumber($code)) {
360			throw $this->createSyntaxErrorException(
361			\sprintf('Invalid number, unexpected digit after 0: %s.', printCharCode($code))
362			);
363			}
364			} else {
365			$this->skipDigits($code);
366			$code = $this->readCharCode($this->pos);
367			}
368
369			if (46 === $code) {
370			// .
371			$isFloat = true;
372
373			$code = $this->readCharCode(++$this->pos);
374			$this->skipDigits($code);
375			$code = $this->readCharCode($this->pos);
376			}
377
378			if (69 === $code \|\| 101 === $code) {
379			// e or E
380			$isFloat = true;
381
382			$code = $this->readCharCode(++$this->pos);
383
384			if (43 === $code \|\| 45 === $code) {
385			// + or -
386			$code = $this->readCharCode(++$this->pos);
387			}
388
389			$this->skipDigits($code);
390			}
391
392			return new Token(
393			$isFloat ? TokenKindEnum::FLOAT : TokenKindEnum::INT,
394			$start,
395			$this->pos,
396			$line,
397			$col,
398			$prev,
399			sliceString($this->body, $start, $this->pos)
400			);
401			}
402
403			/**
404			* Skips digits at the current position.
405			*
406			* @param int $code
407			* @throws SyntaxErrorException
408			*/
409			protected function skipDigits(int $code): void
410			{
411			if (isNumber($code)) {
412			do {
413			$code = $this->readCharCode(++$this->pos);
414			} while (isNumber($code));
415
416			return;
417			}
418
419			throw $this->createSyntaxErrorException(
420			\sprintf('Invalid number, expected digit but got: %s.', printCharCode($code))
421			);
422			}
423
424			/**
425			* Reads a comment token from the source file.
426			*
427			* @param int $line
428			* @param int $col
429			* @param Token $prev
430			* @return Token
431			*/
432			protected function lexComment(int $line, int $col, Token $prev): Token
433			{
434			$start = $this->pos;
435
436			do {
437			$code = $this->readCharCode(++$this->pos);
438			} while ($code !== null && ($code > 0x001f \|\| 0x0009 === $code)); // SourceCharacter but not LineTerminator
439
440			return new Token(
441			TokenKindEnum::COMMENT,
442			$start,
443			$this->pos,
444			$line,
445			$col,
446			$prev,
447			sliceString($this->body, $start + 1, $this->pos)
448			);
449			}
450
451			/**
452			* Reads a spread token from the source.
453			*
454			* @param int $line
455			* @param int $col
456			* @param Token $prev
457			* @return Token
458			*/
459			protected function lexSpread(int $line, int $col, Token $prev): Token
460			{
461			return new Token(TokenKindEnum::SPREAD, $this->pos, $this->pos + 3, $line, $col, $prev);
462			}
463
464			/**
465			* Reads a string token from the source.
466			*
467			* @param int $line
468			* @param int $col
469			* @param Token $prev
470			* @return Token
471			* @throws SyntaxErrorException
472			*/
473			protected function lexString(int $line, int $col, Token $prev): Token
474			{
475			$start = $this->pos;
476			$chunkStart = ++$this->pos; // skip the quote
477			$value = '';
478
479			while ($this->pos < $this->bodyLength &&
480			($code = $this->readCharCode($this->pos)) !== null && !isLineTerminator($code)) {
481			// Closing Quote (")
482			if (34 === $code) {
483			$value .= sliceString($this->body, $chunkStart, $this->pos);
484			return new Token(TokenKindEnum::STRING, $start, $this->pos + 1, $line, $col, $prev, $value);
485			}
486
487			if (isSourceCharacter($code)) {
488			throw $this->createSyntaxErrorException(
489			\sprintf('Invalid character within String: %s.', printCharCode($code))
490			);
491			}
492
493			++$this->pos;
494
495			if (92 === $code) {
496			// \
497			$value .= sliceString($this->body, $chunkStart, $this->pos - 1);
498
499			$code = $this->readCharCode($this->pos);
500
501			switch ($code) {
502			case 34: // "
503			$value .= '"';
504			break;
505			case 47: // /
506			$value .= '/';
507			break;
508			case 92: // \
509			$value .= '\\';
510			break;
511			case 98: // b
512			$value .= '\b';
513			break;
514			case 102: // f
515			$value .= '\f';
516			break;
517			case 110: // n
518			$value .= '\n';
519			break;
520			case 114: // r
521			$value .= '\r';
522			break;
523			case 116: // t
524			$value .= '\t';
525			break;
526			case 117: // u
527			$unicodeString = sliceString($this->body, $this->pos + 1, $this->pos + 5);
528
529			if (!\preg_match('/[0-9A-Fa-f]{4}/', $unicodeString)) {
530			throw $this->createSyntaxErrorException(
531			\sprintf('Invalid character escape sequence: \\u%s.', $unicodeString)
532			);
533			}
534
535			$value .= '\\u' . $unicodeString;
536			$this->pos += 4;
537
538			break;
539			default:
540			throw $this->createSyntaxErrorException(
541			\sprintf('Invalid character escape sequence: \\%s.', \chr($code))
542			);
543			}
544
545			++$this->pos;
546
547			$chunkStart = $this->pos;
548			}
549			}
550
551			throw $this->createSyntaxErrorException('Unterminated string.');
552			}
553
554			/**
555			* Reads a block string token from the source file.
556			*
557			* @param int $line
558			* @param int $col
559			* @param Token $prev
560			* @return Token
561			* @throws SyntaxErrorException
562			*/
563			protected function lexBlockString(int $line, int $col, Token $prev): Token
564			{
565			$start = $this->pos;
566			$this->pos = $start + 3; // skip the triple-quote
567			$chunkStart = $this->pos;
568			$rawValue = '';
569
570			while ($this->pos < $this->bodyLength && ($code = $this->readCharCode($this->pos)) !== null) {
571			// Closing Triple-Quote (""")
572			if ($this->isTripleQuote($code)) {
573			$rawValue .= sliceString($this->body, $chunkStart, $this->pos);
574			return new Token(
575			TokenKindEnum::BLOCK_STRING,
576			$start,
577			$this->pos + 3,
578			$line,
579			$col,
580			$prev,
581			blockStringValue($rawValue)
582			);
583			}
584
585			if (isSourceCharacter($code) && !isLineTerminator($code)) {
586			throw $this->createSyntaxErrorException(
587			\sprintf('Invalid character within String: %s.', printCharCode($code))
588			);
589			}
590
591			if ($this->isEscapedTripleQuote($code)) {
592			$rawValue .= sliceString($this->body, $chunkStart, $this->pos) . '"""';
593			$this->pos += 4;
594			$chunkStart = $this->pos;
595			} else {
596			++$this->pos;
597			}
598			}
599
600			throw $this->createSyntaxErrorException('Unterminated string.');
601			}
602
603			/**
604			* Skips whitespace at the current position.
605			*/
606			protected function skipWhitespace(): void
607			{
608			while ($this->pos < $this->bodyLength) {
609			$code = $this->readCharCode($this->pos);
610
611			if (9 === $code \|\| 32 === $code \|\| 44 === $code \|\| 0xfeff === $code) {
612			// tab \| space \| comma \| BOM
613			++$this->pos;
614			} elseif (10 === $code) {
615			// new line (\n)
616			++$this->pos;
617			++$this->line;
618			$this->lineStart = $this->pos;
619			} elseif (13 === $code) {
620			// carriage return (\r)
621			if (10 === $this->readCharCode($this->pos + 1)) {
622			// carriage return and new line (\r\n)
623			$this->pos += 2;
624			} else {
625			++$this->pos;
626			}
627			++$this->line;
628			$this->lineStart = $this->pos;
629			} else {
630			break;
631			}
632			}
633			}
634
635			/**
636			* @param int $pos
637			* @return int
638			*/
639			protected function readCharCode(int $pos): int
640			{
641			$char = \mb_substr($this->body, $pos, 1, self::ENCODING);
642
643			if ('' === $char) {
644			return 0;
645			}
646
647			if (!isset(self::$charCodeCache[$char])) {
648			self::$charCodeCache[$char] = \mb_ord($char, self::ENCODING);
649			}
650
651			return self::$charCodeCache[$char];
652			}
653
654			/**
655			* Report a message that an unexpected character was encountered.
656			*
657			* @param int $code
658			* @return string
659			*/
660			protected function unexpectedCharacterMessage(int $code): string
661			{
662			if (isSourceCharacter($code) && !isLineTerminator($code)) {
663			return \sprintf('Cannot contain the invalid character %s.', printCharCode($code));
664			}
665
666			if ($code === 39) {
667			// '
668			return 'Unexpected single quote character (\'), did you mean to use a double quote (")?';
669			}
670
671			return \sprintf('Cannot parse the unexpected character %s.', printCharCode($code));
672			}
673
674			/**
675			* @param int $code
676			* @return bool
677			*/
678			protected function isSpread(int $code): bool
679			{
680			return 46 === $code &&
681			$this->readCharCode($this->pos + 1) === 46 &&
682			$this->readCharCode($this->pos + 2) === 46; // ...
683			}
684
685			/**
686			* @param int $code
687			* @return bool
688			*/
689			protected function isString(int $code): bool
690			{
691			return 34 === $code && $this->readCharCode($this->pos + 1) !== 34;
692			}
693
694			/**
695			* @param int $code
696			* @return bool
697			*/
698			protected function isTripleQuote(int $code): bool
699			{
700			return 34 === $code &&
701			34 === $this->readCharCode($this->pos + 1) &&
702			34 === $this->readCharCode($this->pos + 2); // """
703			}
704
705			/**
706			* @param int $code
707			* @return bool
708			*/
709			protected function isEscapedTripleQuote(int $code): bool
710			{
711			return $code === 92 &&
712			34 === $this->readCharCode($this->pos + 1) &&
713			34 === $this->readCharCode($this->pos + 2) &&
714			34 === $this->readCharCode($this->pos + 3); // \"""
715			}
716			}
717

digiaonline / graphql-php

Pull Request — master (#196)

Lexer::lexNumber() C

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