51 lines
1.1 KiB
Plaintext
51 lines
1.1 KiB
Plaintext
module Common
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lexical sorts
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ID INT STRING
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STRING_CHAR BACKSLASH_CHAR
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COMMENT_CHAR INSIDE_COMMENT
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NEWLINE_EOF EOF
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lexical syntax
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ID = [a-zA-Z] [a-zA-Z0-9]*
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INT = "-"? [0-9]+
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STRING = "\"" STRING_CHAR* "\""
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STRING_CHAR = ~[\\\"\n]
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STRING_CHAR = "\\\""
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STRING_CHAR = BACKSLASH_CHAR
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BACKSLASH_CHAR = "\\"
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LAYOUT = [\ \t\n\r]
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COMMENT_CHAR = [\*]
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LAYOUT = "/*" INSIDE_COMMENT* "*/"
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INSIDE_COMMENT = ~[\*]
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INSIDE_COMMENT = COMMENT_CHAR
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LAYOUT = "//" ~[\n\r]* NEWLINE_EOF
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NEWLINE_EOF = [\n\r]
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NEWLINE_EOF = EOF
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EOF =
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lexical restrictions
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// Ensure greedy matching for lexicals
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COMMENT_CHAR -/- [\/]
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INT -/- [0-9]
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ID -/- [a-zA-Z0-9\_]
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// EOF may not be followed by any char
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EOF -/- ~[]
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// Backslash chars in strings may not be followed by "
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BACKSLASH_CHAR -/- [\"]
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context-free restrictions
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// Ensure greedy matching for comments
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LAYOUT? -/- [\ \t\n\r]
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LAYOUT? -/- [\/].[\/]
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LAYOUT? -/- [\/].[\*]
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