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<?php |
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|
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namespace BitCode\BitForm\Jcof; |
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|
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class StringReader |
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{ |
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public $str; |
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|
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public $index; |
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|
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public function __construct($str) |
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{ |
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$this->str = $str; |
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$this->index = 0; |
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} |
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|
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public function peek() |
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{ |
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if ($this->index >= strlen($this->str)) { |
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return null; |
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} else { |
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return substr($this->str, $this->index, 1); |
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} |
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} |
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|
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public function consume() |
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{ |
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$this->index += 1; |
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} |
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|
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public function skip($ch) |
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{ |
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$peeked = $this->peek(); |
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if ($peeked != $ch) { |
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$this->error("Unexpected char: Expected '".$ch."', got '".$peeked."'"); |
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} |
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|
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$this->consume(); |
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} |
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|
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public function maybeSkip($ch) |
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{ |
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if ($this->peek() == $ch) { |
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$this->consume(); |
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} |
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} |
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|
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public function error($msg) |
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{ |
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throw new ParseErrors($msg, $this->index); |
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} |
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} |
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|
