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* Make the lexer treat ']' as an ordinary character in default mode
* Define values of the syntax error type that represents error information concretely
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This commit increases the maximum number of symbol positions per pattern to 2^15 (= 32,768).
When the limit is exceeded, the parse method returns an error.
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* Add cases test the parse method.
* Fix the parser to pass the cases.
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compile command writes logs out to the maleeni-compile.log file.
When you use compiler.Compile(), you can choose whether the lexer writes logs or not.
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* Remove token field from symbolNode
* Simplify notation of nested nodes
* Simplify arguments of newSymbolNode()
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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 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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