17 lines
404 B
Nim
Executable file
17 lines
404 B
Nim
Executable file
import macros
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macro case_token(n: stmt): stmt =
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# creates a lexical analyzer from regular expressions
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# ... (implementation is an exercise for the reader :-)
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nil
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case_token: # this colon tells the parser it is a macro statement
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of r"[A-Za-z_]+[A-Za-z_0-9]*":
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return tkIdentifier
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of r"0-9+":
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return tkInteger
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of r"[\+\-\*\?]+":
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return tkOperator
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else:
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return tkUnknown
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case_token: inc i
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