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<?php |
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namespace donatj\Printf; |
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/** |
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* Parser implements a PHP Printf compatible Printf string parser. |
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* |
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* @see https://www.php.net/manual/en/function.printf.php |
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*/ |
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class Parser { |
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/** @var Emitter */ |
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private $emitter; |
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/** |
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* Parser constructor. |
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* |
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* @param \donatj\Printf\Emitter $emitter The given Emitter to emit Lexemes as parsed |
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*/ |
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public function __construct( Emitter $emitter ) { |
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$this->emitter = $emitter; |
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} |
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/** |
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* Parses a printf string and emit parsed lexemes to the configured Emitter |
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*/ |
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public function parseStr( string $string ) : void { |
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$lexer = new StringLexer($string); |
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for(;;) { |
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$next = $lexer->next(); |
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if( $next->isEof() ) { |
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break; |
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} |
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if( $next->getString() === '%' ) { |
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if( $lexer->hasPrefix('%') ) { |
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$this->emitter->emit( |
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new Lexeme(Lexeme::T_LITERAL_STRING, '%', $lexer->pos()) |
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); |
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$lexer->next(); |
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continue; |
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} |
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$this->lexSprintf($this->emitter, $lexer); |
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continue; |
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} |
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$lexer->rewind(); |
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$this->lexString($this->emitter, $lexer); |
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} |
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} |
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private function lexString( Emitter $emitter, StringLexer $lexer ) : void { |
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$pos = $lexer->pos(); |
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$buffer = ''; |
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for(;;) { |
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$next = $lexer->next(); |
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if( $next->isEof() ) { |
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break; |
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} |
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if( $next->getString() === '%' ) { |
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$lexer->rewind(); |
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break; |
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} |
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$buffer .= $next->getString(); |
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} |
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$emitter->emit( |
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new Lexeme(Lexeme::T_LITERAL_STRING, $buffer, $pos) |
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); |
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} |
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private function lexSprintf( Emitter $emitter, StringLexer $lexer ) : void { |
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$pos = $lexer->pos(); |
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$next = $lexer->next(); |
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$arg = null; |
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$showPositive = false; |
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$padChar = null; |
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$padWidth = null; |
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$leftJustified = false; |
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$precision = null; |
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if( $next->getString() !== '0' && ctype_digit($next->getString()) ) { |
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$lexer->rewind(); |
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$int = $this->eatInt($lexer); |
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if( $lexer->hasPrefix('$') ) { |
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$lexer->next(); |
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$next = $lexer->next(); |
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$arg = $int; |
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} |
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} |
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// flag parsing |
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for(;;) { |
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switch( $next->getString() ) { |
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case '0': |
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$padChar = '0'; |
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$next = $lexer->next(); |
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continue 2; |
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case ' ': |
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$padChar = ' '; |
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$next = $lexer->next(); |
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continue 2; |
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case "'": |
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$next = $lexer->next(); |
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$padChar = $next->getString(); |
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$next = $lexer->next(); |
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continue 2; |
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} |
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if( $next->getString() === '-' ) { |
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$leftJustified = true; |
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$next = $lexer->next(); |
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continue; |
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} |
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if( $next->getString() === '+' ) { |
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$showPositive = true; |
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$next = $lexer->next(); |
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continue; |
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} |
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break; |
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} |
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if( $padChar !== null ) { |
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$lexer->rewind(); |
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$peek = $lexer->peek(); |
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if( ctype_digit($peek->getString()) ) { |
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$padWidth = $this->eatInt($lexer); |
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} |
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$next = $lexer->next(); |
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} |
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if( $next->getString() === '.' ) { |
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if( ctype_digit($lexer->peek()->getString()) ) { |
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$precision = $this->eatInt($lexer); |
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} |
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$next = $lexer->next(); |
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} |
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$tType = Lexeme::T_INVALID; |
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if( in_array($next->getString(), ArgumentLexeme::VALID_T_TYPES, true) ) { |
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$tType = $next->getString(); |
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} |
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$content = $lexer->substr($pos, $lexer->pos() - $pos); |
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$emitter->emit( |
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new ArgumentLexeme( |
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$tType, |
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$content, |
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$pos, |
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$arg, |
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$showPositive, |
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$padChar, |
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$padWidth, |
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$leftJustified, |
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$precision |
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) |
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); |
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} |
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private function eatInt( StringLexer $lexer ) : ?int { |
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$int = ''; |
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for(;;) { |
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$next = $lexer->next(); |
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if( $next->isEof() ) { |
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break; |
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} |
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if( !ctype_digit($next->getString()) ) { |
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$lexer->rewind(); |
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break; |
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} |
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$int .= $next->getString(); |
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} |
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if( $int ) { |
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return (int)$int; |
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} |
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return null; |
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} |
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} |
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donatj /
printf-parser
