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How To Describe Layout and Comments

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The generated Lex specification contains blocks that can be overridden by the user. A block Block may be replaced by the content of a file Block.b .

There is a block LAYOUT which unless overridden has the following form:


   \  { yypos += 1; }
   \t { yypos += 1; }
   \r { yypos += 1; }
   \n { yyPosToNextLine(); }
These are three Lex rules that match blank, newline, and tabulator. They do not include return statements, so the input recognized by the rule is skipped.

The variable yypos keeps track of the source position. It is incremented by the length of the input. In the case of newlines the variable is adjusted by the library function yyPosToNextLine.

This handling of white space may be overridden by providing a file LAYOUT.b .

In addition, a file COMMENTS.b may define comments that are to be skipped. By default, the COMMENTS block is empty.





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