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// file : butl/string-parser.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <butl/string-parser>
#include <utility> // move()
using namespace std;
namespace butl
{
// Utility functions
//
inline static bool
space (char c) noexcept
{
return c == ' ' || c == '\t';
}
// string_parser
//
vector<pair<string, size_t>> string_parser::
parse_quoted_position (const string& s, bool unquote)
{
vector<pair<string, size_t>> r;
for (auto b (s.begin ()), i (b), e (s.end ()); i != e; )
{
for (; i != e && space (*i); ++i) ; // Skip spaces.
if (i == e) // No more strings.
break;
string s;
char quoting ('\0'); // Current quoting mode, can be used as bool.
size_t pos (i - b); // String position.
for (; i != e; ++i)
{
char c (*i);
if (!quoting)
{
if (space (c)) // End of string.
break;
if (c == '"' || c == '\'') // Begin of quoted substring.
{
quoting = c;
if (!unquote)
s += c;
continue;
}
}
else if (c == quoting) // End of quoted substring.
{
quoting = '\0';
if (!unquote)
s += c;
continue;
}
s += c;
}
if (quoting)
throw invalid_string (i - b, "unterminated quoted string");
r.emplace_back (move (s), pos);
}
return r;
}
vector<string> string_parser::
parse_quoted (const string& s, bool unquote)
{
vector<pair<string, size_t>> sp (parse_quoted_position (s, unquote));
vector<string> r;
r.reserve (sp.size ());
for (auto& s: sp)
r.emplace_back (move (s.first));
return r;
}
string string_parser::
unquote (const string& s)
{
string r;
char quoting ('\0'); // Current quoting mode, can be used as bool.
for (auto i (s.begin ()), e (s.end ()); i != e; ++i)
{
char c (*i);
if (!quoting)
{
if (c == '"' || c == '\'') // Begin of quoted substring.
{
quoting = c;
continue;
}
}
else if (c == quoting) // End of quoted substring.
{
quoting = '\0';
continue;
}
r += c;
}
return r;
}
vector<string> string_parser::
unquote (const vector<string>& v)
{
vector<string> r;
r.reserve (v.size ());
for (auto& s: v)
r.emplace_back (unquote (s));
return r;
}
}
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