From: Hartmut Kaiser (hartmutkaiser_at_[hidden])
Date: 2004-09-23 01:01:30
Jonathan Turkanis wrote:
> > I see the library as the inverse of Spirit. Spirit takes
> a linear
> > text and builds complex objects, while the output
> formatting library
> > takes complex objects and renders them as linear text. Just as an
> > abstract syntax tree does not preserve all the information in the
> > input text, in many cases it will be desirable to loose information
> > when an object is formatted using the present library. For example,
> > sometime you might want a dog to be formatted as follows
I 100% agree with that. Moreover I have a first experimental implementation
of such a library here, which is able to do formatted output controlled by a
structure, which is very much similar to the Spirit grammar DSL. BTW, the
name of this library is Tirips (reversed Spirit) :-).
For instance you could write:
generate(str("abc") << char('d'), someoutputiter);
Which will simply output "abcd". The different generator objects are
parametrizable with lazy constructs:
char const *str = "abc";
char ch = 'd';
str[phoenix::const_(str)] << char_[phoenix::const_(ch)],
Would output "abcd" as well.
More sophisticated constructs like the list_ would help in outputting
vector<int> v = ...;
generate(list_(',', int_)[phoenix::const_(v)], someoutputiter);
outputs a comma separeted list of integers, and so on.
I'm currently at the early stages of such a library so there isn't very much
code to show, but if anybody is interested I'm happy to collaborate on
discussing and implementing this.
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