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-rw-r--r--libbuild2/variable.cxx926
1 files changed, 926 insertions, 0 deletions
diff --git a/libbuild2/variable.cxx b/libbuild2/variable.cxx
index 0ad63b1..b0fe32a 100644
--- a/libbuild2/variable.cxx
+++ b/libbuild2/variable.cxx
@@ -3,10 +3,16 @@
#include <libbuild2/variable.hxx>
+#include <cstdio> // snprintf()
#include <cstring> // memcmp(), memcpy()
#include <libbutl/path-pattern.hxx>
+#ifndef BUILD2_BOOTSTRAP
+# include <libbutl/json/parser.hxx>
+# include <libbutl/json/serializer.hxx>
+#endif
+
#include <libbuild2/target.hxx>
#include <libbuild2/diagnostics.hxx>
@@ -584,6 +590,8 @@ namespace build2
if (!wspace (v[0]))
{
+ // Note: see also similar code in to_json_value().
+ //
int b (v[0] == '0' && (v[1] == 'x' || v[1] == 'X') ? 16 : 10);
// May throw invalid_argument or out_of_range.
@@ -1501,6 +1509,924 @@ namespace build2
nullptr // Iterate.
};
+ // json
+ //
+ static string
+ to_string_value (name& n, const char* what)
+ {
+ if (n.typed () || n.qualified () || n.pattern)
+ throw_invalid_argument (n, nullptr, what);
+
+ string s;
+
+ if (n.simple ())
+ s.swap (n.value);
+ else
+ {
+ // Note that here we cannot assume what's in dir is really a path (think
+ // s/foo/bar/) so we have to reverse it exactly.
+ //
+ s = move (n.dir).representation (); // Move out of path.
+
+ if (!n.value.empty ())
+ s += n.value; // Separator is already there.
+ }
+
+ return s;
+ }
+
+ static json_value
+ to_json_value (name& n, const char* what)
+ {
+ if (n.typed () || n.qualified () || n.pattern)
+ throw_invalid_argument (n, nullptr, what);
+
+ string s;
+
+ if (n.simple ())
+ s.swap (n.value);
+ else
+ {
+ // Note that here we cannot assume what's in dir is really a path (think
+ // s/foo/bar/) so we have to reverse it exactly.
+ //
+ s = move (n.dir).representation (); // Move out of path.
+
+ if (!n.value.empty ())
+ s += n.value; // Separator is already there.
+
+ // A path is always interpreted as a JSON string.
+ //
+ return json_value (move (s));
+ }
+
+ bool f;
+ if (s.empty ())
+ return json_value (string ());
+ if (s == "null")
+ return json_value ();
+ else if ((f = (s == "true")) || s == "false")
+ return json_value (f);
+ else if (s.find_first_not_of (
+ "0123456789", (f = (s[0] == '-')) ? 1 : 0) == string::npos)
+ {
+ name n (move (s));
+ return f
+ ? json_value (value_traits<int64_t>::convert (n, nullptr))
+ : json_value (value_traits<uint64_t>::convert (n, nullptr));
+ }
+ //
+ // Handle the hex notation similar to <uint64_t>::convert() (and JSON5).
+ //
+ else if (s[0] == '0' &&
+ (s[1] == 'x' || s[1] == 'X') &&
+ s.size () > 2 &&
+ s.find_first_not_of ("0123456789aAbBcCdDeEfF", 2) == string::npos)
+ {
+ return json_value (
+ value_traits<uint64_t>::convert (name (move (s)), nullptr),
+ true /* hex */);
+ }
+ else
+ {
+ // If this is not a JSON representation of string, array, or object,
+ // then treat it as a string.
+ //
+ // Note that the special `"`, `{`, and `[` characters could be preceded
+ // with whitespaces. Note: see similar test in json_object below.
+ //
+ size_t p (s.find_first_not_of (" \t\n\r"));
+
+ if (p == string::npos || (s[p] != '"' && s[p] != '{' && s[p] != '['))
+ return json_value (move (s));
+
+ // Parse as valid JSON input text.
+ //
+#ifndef BUILD2_BOOTSTRAP
+ try
+ {
+ json_parser p (s, nullptr /* name */);
+ return json_value (p);
+ }
+ catch (const invalid_json_input& e)
+ {
+ // Turned out printing line/column/offset can be misleading since we
+ // could be parsing a single name from a potential list of names.
+ // feels like without also printing the value this is of not much use.
+ //
+#if 0
+ string m ("invalid json input at line ");
+ m += to_string (e.line);
+ m += ", column ";
+ m += to_string (e.column);
+ m += ", byte offset ";
+ m += to_string (e.position);
+ m += ": ";
+ m += e.what ();
+#else
+ string m ("invalid json input: ");
+ m += e.what ();
+#endif
+ throw invalid_argument (move (m));
+ }
+#else
+ throw invalid_argument ("json parsing requested during bootstrap");
+#endif
+ }
+ }
+
+ json_value value_traits<json_value>::
+ convert (names&& ns)
+ {
+ size_t n (ns.size ());
+
+ if (n == 0)
+ {
+ // Note: this is the ([json] ) case, not ([json] ""). See also the
+ // relevant note in json_reverse() below.
+ //
+ return json_value (); // null
+ }
+ else if (n == 1)
+ {
+ return to_json_value (ns.front (), "json");
+ }
+ else
+ {
+ if (ns.front ().pair) // object
+ {
+ json_value r (json_type::object);
+ r.object.reserve (n / 2);
+
+ for (auto i (ns.begin ()); i != ns.end (); ++i)
+ {
+ if (!i->pair)
+ throw invalid_argument (
+ "expected pair in json member value '" + to_string (*i) + '\'');
+
+ // Note that we could support JSON-quoted member names but it's
+ // unclear why would someone want that (and if they do, they can
+ // always specify JSON text instead).
+ //
+ // @@ The empty pair value ([json] one@ ) which is currently empty
+ // string is inconsistent with empty value ([json] ) above which
+ // is null. Maybe we could distinguish the one@ and one@"" cases
+ // via type hints?
+ //
+ string n (to_string_value (*i, "json member name"));
+ json_value v (to_json_value (*++i, "json member"));
+
+ // Check for duplicates. One can use append/prepend to merge.
+ //
+ if (find_if (r.object.begin (), r.object.end (),
+ [&n] (const json_member& m)
+ {
+ return m.name == n;
+ }) != r.object.end ())
+ {
+ throw invalid_argument (
+ "duplicate json object member '" + n + '\'');
+ }
+
+ r.object.push_back (json_member {move (n), move (v)});
+ }
+
+ return r;
+ }
+ else // array
+ {
+ json_value r (json_type::array);
+ r.array.reserve (n);
+
+ for (name& n: ns)
+ {
+ if (n.pair)
+ throw invalid_argument (
+ "unexpected pair in json array element value '" +
+ to_string (n) + '\'');
+
+ r.array.push_back (to_json_value (n, "json array element"));
+ }
+
+ return r;
+ }
+ }
+ }
+
+ static void
+ json_assign (value& v, names&& ns, const variable* var)
+ {
+ using traits = value_traits<json_value>;
+
+ try
+ {
+ traits::assign (v, traits::convert (move (ns)));
+ }
+ catch (const invalid_argument& e)
+ {
+ // Note: ns is not guaranteed to be valid.
+ //
+ diag_record dr (fail);
+ dr << "invalid json value";
+
+ if (var != nullptr)
+ dr << " in variable " << var->name;
+
+ dr << ": " << e;
+ }
+ }
+
+ static void
+ json_append (value& v, names&& ns, const variable* var)
+ {
+ using traits = value_traits<json_value>;
+
+ try
+ {
+ traits::append (v, traits::convert (move (ns)));
+ }
+ catch (const invalid_argument& e)
+ {
+ // Note: ns is not guaranteed to be valid.
+ //
+ diag_record dr (fail);
+ dr << "invalid json value";
+
+ if (var != nullptr)
+ dr << " in variable " << var->name;
+
+ dr << ": " << e;
+ }
+ }
+
+ static void
+ json_prepend (value& v, names&& ns, const variable* var)
+ {
+ using traits = value_traits<json_value>;
+
+ try
+ {
+ traits::prepend (v, traits::convert (move (ns)));
+ }
+ catch (const invalid_argument& e)
+ {
+ // Note: ns is not guaranteed to be valid.
+ //
+ diag_record dr (fail);
+ dr << "invalid json value";
+
+ if (var != nullptr)
+ dr << " in variable " << var->name;
+
+ dr << ": " << e;
+ }
+ }
+
+ static names_view
+ json_reverse (const value& x, names& ns, bool)
+ {
+ const json_value& v (x.as<json_value> ());
+
+ switch (v.type)
+ {
+ case json_type::null:
+ {
+ // @@ Hm, it would be nice if this somehow got mapped to [null]/empty
+ // but still be round-trippable to JSON null. Perhaps via type
+ // hint?
+ //
+ // But won't `print ([json] null)` printing nothing be
+ // surprising. Also, it's not clear that mapping JSON null to out
+ // [null] is a good idea since our [null] means "no value" while
+ // JSON null means "null value".
+ //
+ // Maybe the current semantics is the best: we map our [null] and
+ // empty names to JSON null (naturally) but we always reverse JSON
+ // null to the JSON "null" literal. Or maybe we could reverse it to
+ // null but type-hint it that it's a spelling or [null]/empty.
+ // Quite fuzzy, admittedly. In our model null values decay to empty
+ // so JSON null decaying to "null" literal is strange. Let's try
+ // and see how it goes. See also json_subscript_impl() below.
+ //
+#if 0
+ ns.push_back (name ("null"));
+#endif
+ break;
+ }
+ case json_type::boolean:
+ {
+ ns.push_back (name (v.boolean ? "true" : "false"));
+ break;
+ }
+ case json_type::signed_number:
+ {
+ ns.push_back (value_traits<int64_t>::reverse (v.signed_number));
+ break;
+ }
+ case json_type::unsigned_number:
+ {
+ ns.push_back (value_traits<uint64_t>::reverse (v.unsigned_number));
+ break;
+ }
+ case json_type::hexadecimal_number:
+ {
+ // Hexadecimal representation of 64-bit integers requires a maximum of
+ // 10 character (plus '\0'): 0xffffffff.
+ //
+ char buf[11];
+ snprintf (buf, sizeof (buf),
+ "0x%llx",
+ static_cast<unsigned long long> (v.unsigned_number));
+
+ ns.push_back (name (string (buf)));
+ break;
+ }
+ case json_type::string:
+ //
+ // @@ Hm, it would be nice if this somehow got mapped to unquoted
+ // string but still be round-trippable to JSON value. Perhaps via
+ // the type hint idea? This is pretty bad. See also subscript we
+ // hacked around this somewhat.
+ //
+ // Note that it may be tempting to fix this by only quoting strings
+ // that would otherwise be mis-interpreted (null, true, all digits,
+ // etc). But that would be worse: things would seem to work but
+ // fall apart in the perhaps unlikely event of encountering one of
+ // the problematic values. It is better to produce a consistent
+ // result.
+ //
+ case json_type::array:
+ case json_type::object:
+ {
+ // Serialize as JSON output text.
+ //
+ string o;
+
+#ifndef BUILD2_BOOTSTRAP
+ try
+ {
+ // Disable pretty-printing so that the output is all on the same
+ // line. While it's not going to be easy to read for larger JSON
+ // outputs, it will fit better into the existing model where none of
+ // the value representations use formatting newlines. If a pretty-
+ // printed representation is required, then the $json.serialize()
+ // function can be used to obtain it.
+ //
+ json_buffer_serializer s (o, 0 /* indentation */);
+ v.serialize (s);
+ }
+ catch (const invalid_json_output& e)
+ {
+ // Note: the same diagnostics as in $json.serialize().
+ //
+ diag_record dr;
+ dr << fail << "invalid json value: " << e;
+
+ if (e.event)
+ dr << info << "while serializing " << to_string (*e.event);
+
+ if (e.offset != string::npos)
+ dr << info << "offending byte offset " << e.offset;
+ }
+#else
+ fail << "json serialization requested during bootstrap";
+#endif
+ ns.push_back (name (move (o)));
+ break;
+ }
+ }
+
+ return ns;
+ }
+
+ static int
+ json_compare (const value& l, const value& r)
+ {
+ return l.as<json_value> ().compare (r.as<json_value> ());
+ }
+
+ // Return null value if the index/name is out of range.
+ //
+ static value
+ json_subscript_impl (const value& val, value* val_data,
+ uint64_t i, const string& n, bool index)
+ {
+ const json_value& jv (val.as<json_value> ());
+
+ json_value jr;
+
+ if (index)
+ {
+ if (i >= (jv.type == json_type::array ? jv.array.size () :
+ jv.type == json_type::object ? jv.object.size () : 1))
+ return value ();
+
+ switch (jv.type)
+ {
+ case json_type::null:
+ return value (); // JSON null has no elements.
+ case json_type::boolean:
+ case json_type::signed_number:
+ case json_type::unsigned_number:
+ case json_type::hexadecimal_number:
+ case json_type::string:
+ {
+ // Steal the value if possible.
+ //
+ jr = (&val == val_data
+ ? json_value (move (const_cast<json_value&> (jv)))
+ : json_value (jv));
+ break;
+ }
+ case json_type::array:
+ {
+ // Steal the value if possible.
+ //
+ const json_value& r (jv.array[i]);
+ jr = (&val == val_data
+ ? json_value (move (const_cast<json_value&> (r)))
+ : json_value (r));
+ break;
+ }
+ case json_type::object:
+ {
+ // Represent as an object with one member.
+ //
+ new (&jr.object) json_value::object_type ();
+ jr.type = json_type::object;
+
+ // Steal the member if possible.
+ //
+ const json_member& m (jv.object[i]);
+ jr.object.push_back (&val == val_data
+ ? json_member (move (const_cast<json_member&> (m)))
+ : json_member (m));
+ break;
+ }
+ }
+ }
+ else
+ {
+ auto i (find_if (jv.object.begin (),
+ jv.object.end (),
+ [&n] (const json_member& m)
+ {
+ return m.name == n;
+ }));
+
+ if (i == jv.object.end ())
+ return value ();
+
+ // Steal the member value if possible.
+ //
+ jr = (&val == val_data
+ ? json_value (move (const_cast<json_value&> (i->value)))
+ : json_value (i->value));
+ }
+
+ // @@ As a temporary work around for the lack of type hints (see
+ // json_reverse() for background), reverse simple JSON values to the
+ // corresponding fundamental type values. The thinking here is that
+ // subscript (and iteration) is primarily meant for consumption (as
+ // opposed to reverse() where it is used to build up values and thus
+ // needs things to be fully reversible). Once we add type hints, then
+ // this should become unnecessary and we should be able to just always
+ // return json_value.
+ //
+ // @@ TODO: split this function into two (index/name) once get rid of this.
+ //
+#if 1
+ switch (jr.type)
+ {
+ case json_type::null: return value (names {});
+ case json_type::boolean: return value (jr.boolean);
+ case json_type::signed_number: return value (jr.signed_number);
+ case json_type::unsigned_number:
+ case json_type::hexadecimal_number: return value (jr.unsigned_number);
+ case json_type::string: return value (move (jr.string));
+ case json_type::array:
+ case json_type::object: break;
+ }
+#endif
+
+ return value (move (jr));
+ }
+
+ static value
+ json_subscript (const value& val, value* val_data,
+ value&& sub,
+ const location& sloc,
+ const location& bloc)
+ {
+ const json_value* jv (val.null ? nullptr : &val.as<json_value> ());
+
+ // For consistency with other places treat JSON null value as maybe
+ // missing array/object. In particular, we don't want to fail trying to
+ // lookup by-name on a null value which could have been an object.
+ //
+ if (jv != nullptr && jv->type == json_type::null)
+ jv = nullptr;
+
+ // Process subscript even if the value is null to make sure it is valid.
+ //
+ bool index;
+ uint64_t i (0);
+ string n;
+
+ // Always interpret uint64-typed subscript as index even for objects.
+ // This can be used to, for example, to iterate with an index over object
+ // members.
+ //
+ if (!sub.null && sub.type == &value_traits<uint64_t>::value_type)
+ {
+ i = sub.as<uint64_t> ();
+ index = true;
+ }
+ else
+ {
+ // How we interpret the subscript depends on the JSON value type. For
+ // objects we treat it as a string (member name) and for everything else
+ // as an index.
+ //
+ // What if the value is null and we don't have a JSON type? In this case
+ // we treat as a string since a valid number is also a valid string.
+ //
+ try
+ {
+ if (jv == nullptr || jv->type == json_type::object)
+ {
+ n = convert<string> (move (sub));
+ index = false;
+ }
+ else
+ {
+ i = convert<uint64_t> (move (sub));
+ index = true;
+ }
+ }
+ catch (const invalid_argument& e)
+ {
+ // We will likely be trying to interpret a member name as an integer
+ // due to the incorrect value type so issue appropriate diagnostics.
+ //
+ diag_record dr;
+ dr << fail (sloc) << "invalid json value subscript: " << e;
+
+ if (jv != nullptr && jv->type != json_type::object)
+ dr << info << "json value type is " << jv->type;
+
+ dr << info (bloc) << "use the '\\[' escape sequence if this is a "
+ << "wildcard pattern" << endf;
+ }
+ }
+
+ return (jv != nullptr
+ ? json_subscript_impl (val, val_data, i, n, index)
+ : value ());
+ }
+
+ void json_iterate (const value& val,
+ const function<void (value&&, bool first)>& f)
+ {
+ // Implement in terms of subscript for consistency (in particular,
+ // iterating over simple values like number, string).
+ //
+ for (uint64_t i (0);; ++i)
+ {
+ value e (json_subscript_impl (val, nullptr, i, {}, true));
+
+ if (e.null)
+ break;
+
+ f (move (e), i == 0);
+ }
+ }
+
+ const json_value value_traits<json_value>::empty_instance;
+ const char* const value_traits<json_value>::type_name = "json";
+
+ // Note that whether the json value is a container or not depends on its
+ // payload type. However, for our purposes it feels correct to assume it is
+ // a container rather than not with itself as the element type (see
+ // value_traits::{container, element_type} usage for details).
+ //
+ const value_type value_traits<json_value>::value_type
+ {
+ type_name,
+ sizeof (json_value),
+ nullptr, // No base.
+ true, // Container.
+ &value_traits<json_value>::value_type, // Element (itself).
+ &default_dtor<json_value>,
+ &default_copy_ctor<json_value>,
+ &default_copy_assign<json_value>,
+ &json_assign,
+ json_append,
+ json_prepend,
+ &json_reverse,
+ nullptr, // No cast (cast data_ directly).
+ &json_compare,
+ &default_empty<json_value>,
+ &json_subscript,
+ &json_iterate
+ };
+
+ // json_array
+ //
+ json_array value_traits<json_array>::
+ convert (names&& ns)
+ {
+ json_array r;
+
+ size_t n (ns.size ());
+ if (n == 0)
+ ; // Empty.
+ else if (n == 1)
+ {
+ // Tricky: this can still be JSON input text that is an array. And if
+ // it's not, then make it an element of an array.
+ //
+ json_value v (to_json_value (ns.front (), "json"));
+
+ if (v.type == json_type::array)
+ r.array = move (v.array);
+ else
+ r.array.push_back (move (v));
+ }
+ else
+ {
+ r.array.reserve (n);
+
+ for (name& n: ns)
+ {
+ if (n.pair)
+ throw invalid_argument (
+ "unexpected pair in json array element value '" +
+ to_string (n) + '\'');
+
+ r.array.push_back (to_json_value (n, "json array element"));
+ }
+ }
+
+ return r;
+ }
+
+ static void
+ json_array_assign (value& v, names&& ns, const variable* var)
+ {
+ using traits = value_traits<json_array>;
+
+ try
+ {
+ traits::assign (v, traits::convert (move (ns)));
+ }
+ catch (const invalid_argument& e)
+ {
+ // Note: ns is not guaranteed to be valid.
+ //
+ diag_record dr (fail);
+ dr << "invalid json array";
+
+ if (var != nullptr)
+ dr << " in variable " << var->name;
+
+ dr << ": " << e;
+ }
+ }
+
+ static void
+ json_array_append (value& v, names&& ns, const variable* var)
+ {
+ using val_traits = value_traits<json_value>;
+ using arr_traits = value_traits<json_array>;
+
+ try
+ {
+ arr_traits::append (v, val_traits::convert (move (ns)));
+ }
+ catch (const invalid_argument& e)
+ {
+ // Note: ns is not guaranteed to be valid.
+ //
+ diag_record dr (fail);
+ dr << "invalid json array";
+
+ if (var != nullptr)
+ dr << " in variable " << var->name;
+
+ dr << ": " << e;
+ }
+ }
+
+ static void
+ json_array_prepend (value& v, names&& ns, const variable* var)
+ {
+ using val_traits = value_traits<json_value>;
+ using arr_traits = value_traits<json_array>;
+
+ try
+ {
+ arr_traits::prepend (v, val_traits::convert (move (ns)));
+ }
+ catch (const invalid_argument& e)
+ {
+ // Note: ns is not guaranteed to be valid.
+ //
+ diag_record dr (fail);
+ dr << "invalid json array";
+
+ if (var != nullptr)
+ dr << " in variable " << var->name;
+
+ dr << ": " << e;
+ }
+ }
+
+ const json_array value_traits<json_array>::empty_instance;
+ const char* const value_traits<json_array>::type_name = "json_array";
+
+ const value_type value_traits<json_array>::value_type
+ {
+ type_name,
+ sizeof (json_array),
+ &value_traits<json_value>::value_type, // Base (assuming direct cast works
+ // for both).
+ true, // Container.
+ &value_traits<json_value>::value_type, // Element (json_value).
+ &default_dtor<json_array>,
+ &default_copy_ctor<json_array>,
+ &default_copy_assign<json_array>,
+ &json_array_assign,
+ &json_array_append,
+ &json_array_prepend,
+ &json_reverse,
+ nullptr, // No cast (cast data_ directly).
+ &json_compare,
+ &default_empty<json_array>,
+ &json_subscript,
+ &json_iterate
+ };
+
+ // json_object
+ //
+ json_object value_traits<json_object>::
+ convert (names&& ns)
+ {
+ json_object r;
+
+ size_t n (ns.size ());
+ if (n == 0)
+ ; // Empty.
+ else if (n == 1)
+ {
+ // Tricky: this can still be JSON input text that is an object. So do
+ // a similar check as in to_json_value() above.
+ //
+ name& n (ns.front ());
+
+ if (!n.simple () || n.pattern)
+ throw_invalid_argument (n, nullptr, "json object");
+
+ string& s (n.value);
+ size_t p (s.find_first_not_of (" \t\n\r"));
+
+ if (p == string::npos || s[p] != '{')
+ {
+ // Unlike for array above, we cannot turn any value into a member.
+ //
+ throw invalid_argument ("expected json object instead of '" + s + '\'');
+ }
+
+ json_value v (to_json_value (ns.front (), "json object"));
+ assert (v.type == json_type::object);
+ r.object = move (v.object);
+ }
+ else
+ {
+ r.object.reserve (n / 2);
+
+ for (auto i (ns.begin ()); i != ns.end (); ++i)
+ {
+ if (!i->pair)
+ throw invalid_argument (
+ "expected pair in json member value '" + to_string (*i) + '\'');
+
+ string n (to_string_value (*i, "json member name"));
+ json_value v (to_json_value (*++i, "json member"));
+
+ if (find_if (r.object.begin (), r.object.end (),
+ [&n] (const json_member& m)
+ {
+ return m.name == n;
+ }) != r.object.end ())
+ {
+ throw invalid_argument (
+ "duplicate json object member '" + n + '\'');
+ }
+
+ r.object.push_back (json_member {move (n), move (v)});
+ }
+ }
+
+ return r;
+ }
+
+ static void
+ json_object_assign (value& v, names&& ns, const variable* var)
+ {
+ using traits = value_traits<json_object>;
+
+ try
+ {
+ traits::assign (v, traits::convert (move (ns)));
+ }
+ catch (const invalid_argument& e)
+ {
+ // Note: ns is not guaranteed to be valid.
+ //
+ diag_record dr (fail);
+ dr << "invalid json object";
+
+ if (var != nullptr)
+ dr << " in variable " << var->name;
+
+ dr << ": " << e;
+ }
+ }
+
+ static void
+ json_object_append (value& v, names&& ns, const variable* var)
+ {
+ using val_traits = value_traits<json_value>;
+ using obj_traits = value_traits<json_object>;
+
+ try
+ {
+ obj_traits::append (v, val_traits::convert (move (ns)));
+ }
+ catch (const invalid_argument& e)
+ {
+ // Note: ns is not guaranteed to be valid.
+ //
+ diag_record dr (fail);
+ dr << "invalid json object";
+
+ if (var != nullptr)
+ dr << " in variable " << var->name;
+
+ dr << ": " << e;
+ }
+ }
+
+ static void
+ json_object_prepend (value& v, names&& ns, const variable* var)
+ {
+ using val_traits = value_traits<json_value>;
+ using obj_traits = value_traits<json_object>;
+
+ try
+ {
+ obj_traits::prepend (v, val_traits::convert (move (ns)));
+ }
+ catch (const invalid_argument& e)
+ {
+ // Note: ns is not guaranteed to be valid.
+ //
+ diag_record dr (fail);
+ dr << "invalid json object";
+
+ if (var != nullptr)
+ dr << " in variable " << var->name;
+
+ dr << ": " << e;
+ }
+ }
+
+ const json_object value_traits<json_object>::empty_instance;
+ const char* const value_traits<json_object>::type_name = "json_object";
+
+ const value_type value_traits<json_object>::value_type
+ {
+ type_name,
+ sizeof (json_object),
+ &value_traits<json_value>::value_type, // Base (assuming direct cast works
+ // for both).
+ true, // Container.
+ &value_traits<json_value>::value_type, // Element (json_value).
+ &default_dtor<json_object>,
+ &default_copy_ctor<json_object>,
+ &default_copy_assign<json_object>,
+ &json_object_assign,
+ &json_object_append,
+ &json_object_prepend,
+ &json_reverse,
+ nullptr, // No cast (cast data_ directly).
+ &json_compare,
+ &default_empty<json_object>,
+ &json_subscript,
+ &json_iterate
+ };
+
// cmdline
//
cmdline value_traits<cmdline>::
generated by cgit v1.1 at 2024-11-25 08:03:15 +0000