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// file : butl/manifest-parser -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUTL_MANIFEST_PARSER
#define BUTL_MANIFEST_PARSER
#include <string>
#include <iosfwd>
#include <cstdint> // uint64_t
#include <stdexcept> // runtime_error
#include <butl/export>
#include <butl/char-scanner>
namespace butl
{
class LIBBUTL_EXPORT manifest_parsing: public std::runtime_error
{
public:
manifest_parsing (const std::string& name,
std::uint64_t line,
std::uint64_t column,
const std::string& description);
std::string name;
std::uint64_t line;
std::uint64_t column;
std::string description;
};
class manifest_name_value
{
public:
std::string name;
std::string value;
std::uint64_t name_line;
std::uint64_t name_column;
std::uint64_t value_line;
std::uint64_t value_column;
bool
empty () const {return name.empty () && value.empty ();}
};
class LIBBUTL_EXPORT manifest_parser: protected butl::char_scanner
{
public:
manifest_parser (std::istream& is, const std::string& name)
: char_scanner (is), name_ (name) {}
const std::string&
name () const {return name_;}
// The first returned pair is special "start-of-manifest" with
// empty name and value being the format version: {"", "<ver>"}.
// After that we have a sequence of ordinary pairs which are
// the manifest. At the end of the manifest we have the special
// "end-of-manifest" pair with empty name and value: {"", ""}.
// After that we can either get another start-of-manifest pair
// (in which case the whole sequence repeats from the beginning)
// or we get another end-of-manifest pair which signals the end
// of stream (aka EOF). To put it another way, the parse sequence
// always has the following form:
//
// ({"", "<ver>"} {"<name>", "<value>"}* {"", ""})* {"", ""}
//
manifest_name_value
next ();
private:
void
parse_name (manifest_name_value&);
void
parse_value (manifest_name_value&);
// Skip spaces and return the first peeked non-space character.
//
xchar
skip_spaces ();
private:
const std::string name_;
enum {start, body, end} s_ = start;
std::string version_; // Current format version.
};
}
#endif // BUTL_MANIFEST_PARSER
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