Otherwise, the original character is placed in the output stream, and the input stream is reset to the original position.

否则，将原来的字符放到输出流中，并且将输入流重置到原始位置。

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Lex tries each rule in order, matching the longest stream of input it can.

lex依次尝试每一个规则，尽可能地匹配最长的输入流。

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IntegerLiteral expects to immediately encounter an integer in the input stream, else the expression would be invalid.

integerLiteral希望在输入流中立即遇到一个整数，否则该表达式将无效。

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