I am parsing a grammar that uses minus or plus at the end of line to
indicate a continuation.
Following are some examples --
* command parm1-
parm2
* command parm1 -
parm2
* command parm1 par-
m2
* command verylongparmthatextends-
acrosstwolines-
oreventhreelines
The general structure of the grammar is
Command <one or more positional parameters> <one or more keyword
parameters>
Keyword parameters are keyword with one or more optional
subparameters.
I have developed a parser that successfully parses the language, but I
can't seem to resolve the issue of the continuations in a consistent
fashion due to the way that they can be inserted at any point in the
token stream.
I would like to just absorb them into the hidden stream so that the
input appears to be on a single line.
If I wanted to make a first pass on the input and just absorb '-\n' and
'+\n' then all would be well. That seems pretty wasteful to make a pass
to just do that. It seems like I should be able to do it during the
lexical pass.
One other thing, the + and - continuation characters can be considered
part of the parameter; it's only the case that a + or - at the end of
the line is considered a continuation. For example
* command 'this is a literal that includes a --
in the text'
should reduce to "command 'this is a literal that includes a -in the
text'"
This seems like this should be a simple thing to do considering that
whitespace and comments are so easily absorbed.
Any advice or suggestion is appreciated.
Regards, Fred
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