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// file : libbutl/tab-parser.mxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#ifndef __cpp_modules_ts
#pragma once
#endif
// C includes.
#ifndef __cpp_lib_modules_ts
#include <iosfwd>
#include <string>
#include <vector>
#include <cstdint> // uint64_t
#include <stdexcept> // runtime_error
#endif
// Other includes.
#ifdef __cpp_modules_ts
export module butl.tab_parser;
#ifdef __cpp_lib_modules_ts
import std.core;
import std.io;
#endif
#endif
#include <libbutl/export.hxx>
LIBBUTL_MODEXPORT namespace butl
{
class LIBBUTL_SYMEXPORT tab_parsing: public std::runtime_error
{
public:
tab_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;
};
// Line and columns are useful for issuing diagnostics about invalid or
// missing fields.
//
struct tab_field
{
std::string value; // Field string (quoting preserved).
std::uint64_t column; // Field start column number (one-based).
};
struct tab_fields: std::vector<tab_field>
{
std::uint64_t line; // Line number (one-based).
std::uint64_t end_column; // End-of-line column (line length).
};
// Read and parse lines consisting of space-separated fields. Field can
// contain single or double quoted substrings (with spaces) which are
// interpreted but preserved. No escaping of the quote characters is
// supported. Blank lines and lines that start with # (collectively called
// empty lines) are ignored.
//
class LIBBUTL_SYMEXPORT tab_parser
{
public:
tab_parser (std::istream& is, const std::string& name)
: is_ (is), name_ (name) {}
// Return next line of fields. Skip empty lines. Empty result denotes the
// end of stream.
//
tab_fields
next ();
private:
std::istream& is_;
const std::string name_;
std::uint64_t line_ = 0;
};
}
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