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+// file : libbutl/tab-parser.mxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef __cpp_modules
+#pragma once
+#endif
+
+// C includes.
+
+#ifndef __cpp_lib_modules
+#include <iosfwd>
+#include <string>
+#include <vector>
+#include <cstdint> // uint64_t
+#include <stdexcept> // runtime_error
+#endif
+
+// Other includes.
+
+#ifdef __cpp_modules
+export module butl.tab_parser;
+#ifdef __cpp_lib_modules
+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;
+ };
+}