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Code Issues Releases Wiki Activity

ircd::parse::buffer: Add basic convenience functions.

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This commit is contained in:
Jason Volk 2017-03-13 12:05:13 -07:00
parent bfd61f84f1
commit 03528ebf67
1 changed files with 45 additions and 7 deletions
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52
include/ircd/parse.h
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@ -33,6 +33,9 @@ struct parse
IRCD_EXCEPTION(error, grammar_error)
IRCD_EXCEPTION(error, syntax_error)
using read_closure = std::function<void (char *&, char *)>;
using parse_closure = std::function<bool (const char *&, const char *)>;
struct grammar;
struct context;
struct buffer;
@ -54,10 +57,27 @@ struct parse::grammar
struct parse::buffer
{
char *base;
const char *parsed;
char *read;
char *stop;
char *base; // Lowest address of the buffer (const)
const char *parsed; // Data between [base, parsed] is completed
char *read; // Data between [parsed, read] is unparsed
char *stop; // Data between [read, stop] is unreceived (const)
size_t size() const { return stop - base; }
size_t completed() const { return parsed - base; }
size_t unparsed() const { return read - parsed; }
size_t remaining() const { return stop - read; }
void discard();
void remove();
buffer(const buffer &old, char *const &start, char *const &stop)
:base{start}
,parsed{start}
,read{start + old.unparsed()}
,stop{stop}
{
memmove(base, old.base, old.unparsed());
}
buffer(char *const &start, char *const &stop)
:base{start}
@ -66,6 +86,10 @@ struct parse::buffer
,stop{stop}
{}
template<size_t N> buffer(const buffer &old, char (&buf)[N])
:buffer{old, buf, buf + N}
{}
template<size_t N> buffer(char (&buf)[N])
:buffer{buf, buf + N}
{}
@ -73,13 +97,13 @@ struct parse::buffer
struct parse::context
{
using read_closure = std::function<void (char *&, char *)>;
using parse_closure = std::function<bool (const char *&, const char *)>;
const char *&parsed;
char *&read;
char *stop;
size_t unparsed() const { return read - parsed; }
size_t remaining() const { return stop - read; }
read_closure reader;
void operator()(const parse_closure &);
@ -117,3 +141,17 @@ ircd::parse::context::operator()(const parse_closure &pc)
while(!pc(parsed, const_cast<const char *>(read)))
reader(read, stop);
}
inline void
ircd::parse::buffer::remove()
{
memmove(base, parsed, unparsed());
read = base + unparsed();
parsed = base;
}
inline void
ircd::parse::buffer::discard()
{
read -= unparsed();
}