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lex command writes logs out to the maleeni-lex.log file.
When you generate a lexer using driver.NewLexer(), you can choose whether the lexer writes logs or not.
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APIs of compiler and driver packages use these types. Because CompiledLexSpec struct a lexer takes has kind names of lexical specification entries, the lexer sets them to tokens.
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The bracket expression matches any single character specified in it. In the bracket expression, the special characters like ., *, and so on are also handled as normal characters.
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The dot symbol matches any single character. When the dot symbol appears, the parser generates an AST matching all of the well-formed UTF-8 byte sequences.
Refelences:
* https://www.unicode.org/versions/Unicode13.0.0/ch03.pdf#G7404
* Table 3-6. UTF-8 Bit Distribution
* Table 3-7. Well-Formed UTF-8 Byte Sequences
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The driver takes a DFA and an input text and generates a lexer. The lexer tokenizes the input text according to the lexical specification that the DFA expresses.
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The compiler takes a lexical specification expressed by regular expressions and generates a DFA accepting the tokens.
Operators that you can use in the regular expressions are concatenation, alternation, repeat, and grouping.
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