How do I parse this correctly with spirit? - c++

Question

My situation: I'm new to Spirit, I have to use VC6 and am thus using Spirit 1.6.4.
I have a line that looks like this:
//The Description;DESCRIPTION;;
I want to put the text DESCRIPTION in a string if the line starts with //The Description;.
I have something that works but looks not that elegant to me:
vector<char> vDescription; // std::string doesn't work due to missing ::clear() in VC6's STL implementation
if(parse(chars,
// Begin grammar
(
as_lower_d["//the description;"]
>> (+~ch_p(';'))[assign(vDescription)]
),
// End grammar
space_p).hit)
{
const string desc(vDescription.begin(), vDescription.end());
}
I would much more like to assign all printable characters up to the next ';' but the following won't work because parse(...).hit == false
parse(chars,
// Begin grammar
(
as_lower_d["//the description;"]
>> (+print_p)[assign(vDescription)]
>> ';'
),
// End grammar
space_p).hit)
How do I make it hit?

Answer 1

You might try using confix_p:
confix_p(as_lower_d["//the description;"],
(+print_p)[assign(vDescription)],
ch_p(';')
)
It should be equivalent to Fred's response.
The reason your code fails is because print_p is greedy. The +print_p parser will consume characters until it encounters the end of the input or a non-printable character. Semicolon is printable, so print_p claims it. Your input gets exhausted, the variable is assigned, and the match fails — there's nothing left for the last semicolon of your parser to match.
Fred's answer constructs a new parser, (print_p - ';'), which matches everything print_p does, except for semicolons. "Match everything except X, and then match X" is a common pattern, so confix_p is provided as a shortcut for constructing that kind of parser. The documentation suggests using it for parsing C- or Pascal-style comments, but that's not required.
For your code to work, Spirit would need to recognize that the greedy print_p matched too much and then backtrack to allow matching less. But although Spirit will backtrack, it won't backtrack to the "middle" of what a sub-parser would otherwise greedily match. It will backtrack to the next "choice point," but your grammar doesn't have any. See Exhaustive backtracking and greedy RD in the Spirit documentation.

Answer 2

You're not getting a hit because ';' is matched by print_p. Try this:
parse(chars,
// Begin grammar
(
as_lower_d["//the description;"]
>> (+(print_p-';'))[assign(vDescription)]
>> ';'
),
// End grammar
space_p).hit)