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// file : butl/tab-parser -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUTL_TAB_PARSER
#define BUTL_TAB_PARSER
#include <string>
#include <vector>
#include <iosfwd>
#include <cstdint> // uint64_t
#include <stdexcept> // runtime_error
#include <butl/export>
#include <butl/char-scanner>
namespace butl
{
class LIBBUTL_EXPORT 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_EXPORT tab_parser: protected butl::char_scanner
{
public:
tab_parser (std::istream& is, const std::string& name)
: char_scanner (is), name_ (name) {}
// Return next line of fields. Skip empty lines. Empty result denotes the
// end of stream.
//
tab_fields
next ();
private:
// Skip spaces and return the first peeked non-space character.
//
xchar
skip_spaces ();
private:
const std::string name_;
};
}
#endif // BUTL_TAB_PARSER
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