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// file : libbuild2/functions-builtin.cxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#include <sstream>
#include <libbuild2/scope.hxx>
#include <libbuild2/function.hxx>
#include <libbuild2/variable.hxx>
using namespace std;
namespace build2
{
// Note: not static since used by type-specific sort() implementations.
//
bool
functions_sort_flags (optional<names> fs)
{
bool r (false);
if (fs)
{
for (name& f: *fs)
{
string s (convert<string> (move (f)));
if (s == "dedup")
r = true;
else
throw invalid_argument ("invalid flag '" + s + "'");
}
}
return r;
};
static const char hex_digits[] = "0123456789abcdef";
static string
to_string (uint64_t i, optional<value> base, optional<value> width)
{
uint64_t b (base ? convert<uint64_t> (move (*base)) : 10);
size_t w (width
? static_cast<size_t> (convert<uint64_t> (move (*width)))
: 0);
// One day we can switch to C++17 std::to_chars().
//
string r;
switch (b)
{
case 10:
{
r = to_string (i);
if (w > r.size ())
r.insert (0, w - r.size (), '0');
break;
}
case 16:
{
r.reserve (18);
r += "0x";
for (size_t j (64); j != 0; )
{
j -= 4;
size_t d ((i >> j) & 0x0f);
// Omit leading zeros but watch out for the i==0 corner case.
//
if (d != 0 || r.size () != 2 || j == 0)
r += hex_digits[d];
}
if (w > r.size () - 2)
r.insert (2, w - (r.size () - 2), '0');
break;
}
default:
throw invalid_argument ("unsupported base");
}
return r;
}
void
builtin_functions (function_map& m)
{
function_family f (m, "builtin");
// Note that we may want to extend the scope argument to a more general
// notion of "lookup context" (scope, target, prerequisite).
//
// Note that this function is not pure.
//
f.insert ("defined", false) += [](const scope* s, names name)
{
if (s == nullptr)
fail << "defined() called out of scope" << endf;
return (*s)[convert<string> (move (name))].defined ();
};
// Return variable visibility if it has been entered and NULL otherwise.
//
// Note that this function is not pure.
//
f.insert ("visibility", false) += [](const scope* s, names name)
{
if (s == nullptr)
fail << "visibility() called out of scope" << endf;
const variable* var (
s->ctx.var_pool.find (convert<string> (move (name))));
return (var != nullptr
? optional<string> (to_string (var->visibility))
: nullopt);
};
f["type"] += [](value* v) {return v->type != nullptr ? v->type->name : "";};
f["null"] += [](value* v) {return v->null;};
f["empty"] += [](value* v) {return v->null || v->empty ();};
f["identity"] += [](value* v) {return move (*v);};
// string
//
f["string"] += [](bool b) {return b ? "true" : "false";};
f["string"] += [](int64_t i) {return to_string (i);};
f["string"] += [](uint64_t i, optional<value> base, optional<value> width)
{
return to_string (i, move (base), move (width));
};
// Quote a value returning its string representation. If escape is true,
// then also escape (with a backslash) the quote characters being added
// (this is useful if the result will be re-parsed, for example as a
// Testscript command line).
//
f["quote"] += [](value* v, optional<value> escape)
{
if (v->null)
return string ();
untypify (*v); // Reverse to names.
ostringstream os;
to_stream (os,
v->as<names> (),
quote_mode::normal,
'@' /* pair */,
escape && convert<bool> (move (*escape)));
return os.str ();
};
// $size(<ints>)
//
// Return the number of elements in the sequence.
//
f["size"] += [] (int64s v) {return v.size ();};
f["size"] += [] (uint64s v) {return v.size ();};
// $sort(<ints> [, <flags>])
//
// Sort integers in ascending order.
//
// The following flags are supported:
//
// dedup - in addition to sorting also remove duplicates
//
f["sort"] += [](int64s v, optional<names> fs)
{
sort (v.begin (), v.end ());
if (functions_sort_flags (move (fs)))
v.erase (unique (v.begin(), v.end()), v.end ());
return v;
};
f["sort"] += [](uint64s v, optional<names> fs)
{
sort (v.begin (), v.end ());
if (functions_sort_flags (move (fs)))
v.erase (unique (v.begin(), v.end()), v.end ());
return v;
};
// getenv
//
// Return NULL if the environment variable is not set, untyped value
// otherwise.
//
// Note that if the build result can be affected by the variable being
// queried, then it should be reported with the config.environment
// directive.
//
// Note that this function is not pure.
//
f.insert ("getenv", false) += [](names name)
{
optional<string> v (getenv (convert<string> (move (name))));
if (!v)
return value ();
names r;
r.emplace_back (to_name (move (*v)));
return value (move (r));
};
}
}
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