/**
* Authors: k.inaba
* License: NYSL 0.9982 http://www.kmonos.net/nysl/
*
* Convert values between Polemy and D
*/
module polemy.valueconv;
import polemy._common;
import polemy.failure;
import polemy.ast;
import polemy.layer;
import polemy.value;
import std.string;
LexPosition extractPos( Table t )
{
if(auto tt = t.access!Table(ValueLayer, "pos"))
{
auto fn = tt.access!StrValue(ValueLayer, "filename");
auto ln = tt.access!IntValue(ValueLayer, "lineno");
auto cl = tt.access!IntValue(ValueLayer, "column");
if(fn !is null && ln !is null && cl !is null)
return new LexPosition(fn.data,cast(int)ln.data.toInt,cast(int)cl.data.toInt);
}
return null;
}
/// Experimental!! Convert Polemy value to D Value
T polemy2d(T)(Value _v, LexPosition callpos=null)
{
static if(is(T==BigInt))
{
if(auto v = cast(IntValue)_v)
return v.data;
}
else
static if(isIntegral!(T))
{
if(auto v = cast(IntValue)_v)
return cast(T) v.data.toLong();
}
else
static if(is(T==string))
{
if(auto v = cast(StrValue)_v)
return v.data;
}
else
static if(is(T S : S[]))
{
if(auto t = cast(Table)_v)
{
S[] result;
foreach(e; t.toList())
result ~= polemy2d!(S)(e, callpos);
return result;
}
}
else
static if(is(T == AST))
{
if(auto t = cast(Table)_v)
{
LexPosition pos = extractPos(t);
StrValue typ = cast(StrValue) t.access!StrValue(ValueLayer, "is");
if( typ is null )
throw genex!RuntimeException(callpos, text(`Invalid AST (no "is" field): `, _v));
foreach(AT; ListOfASTTypes)
if(typ.data == typeid(AT).name.split(".")[$-1].tolower())
{
typeof(AT.tupleof) mems;
foreach(i,m; mems)
{
string name = AT.tupleof[i].stringof.split(".")[$-1];
Value vm = t.access!Value(ValueLayer, name);
if( vm is null )
throw genex!RuntimeException(callpos,
text(`Invalid AST (no "`,name,`" field) for "`, typ, `" node: `, _v));
mems[i] = polemy2d!(typeof(m))(vm, callpos);
}
return new AT(pos,mems);
}
throw genex!RuntimeException(callpos, text(`Invalid AST (unknown "is" field): `, typ));
}
throw genex!RuntimeException(callpos, text(`Invalid AST (not a table): `, _v));
}
else
static if(is(T == class))
{
if(auto t = cast(Table)_v)
{
typeof(T.tupleof) mems;
foreach(i,m; mems)
mems[i] = polemy2d!(typeof(m))(t.get(T.tupleof[i].stringof.split(".")[$-1], ValueLayer), callpos);
return new T(mems);
}
}
else
static assert(false, "unknown type <"~T.stringof~"> during polemy2d decoding");
throw genex!RuntimeException(callpos, text("Cannot convert ",_v," to ",T.stringof));
}
/// Cons of two pairs
Table makeCons(Value a, Value d)
{
Table t = new Table;
t.set("car", ValueLayer, a);
t.set("cdr", ValueLayer, d);
return t;
}
/// Experimental!! Convert D value (except AST) to Polemy Value
Value d2polemy(T)(T e)
{
return ast2table(e, delegate Value(AST){ assert(false); });
}
/// Convert AST to Table so that it can be used in Polemy
Value ast2table(T)(T e, Value delegate(AST) rec)
{
static if(is(T==BigInt) || isIntegral!(T))
return new IntValue(e);
else
static if(is(Unqual!(T)==string))
return new StrValue(e);
else
static if(is(T S : S[]))
{
Table lst = new Table;
foreach_reverse(a; e)
static if(is(S : AST))
lst = makeCons(rec(a), lst);
else
lst = makeCons(ast2table(a,rec), lst);
return lst;
}
else
static if(is(T : AST))
{
assert( typeid(e) == typeid(T), text("abstracted: ", typeid(e), " vs ", typeid(T)) );
auto t = new Table;
t.set("pos", ValueLayer, ast2table(e.pos,rec));
t.set("is" , ValueLayer, new StrValue(typeid(e).name.split(".")[$-1].tolower()));
foreach(i,m; e.tupleof)
static if(is(typeof(m) : AST))
t.set(e.tupleof[i].stringof.split(".")[$-1], ValueLayer, rec(m));
else
t.set(e.tupleof[i].stringof.split(".")[$-1], ValueLayer, ast2table(m,rec));
return t;
}
else
static if(is(T == class))
{
auto t = new Table;
foreach(i,m; e.tupleof)
static if(is(typeof(m) : AST))
t.set(e.tupleof[i].stringof[2..$], ValueLayer, rec(m));
else
t.set(e.tupleof[i].stringof[2..$], ValueLayer, ast2table(m,rec));
return t;
}
else
static assert(false, "unknown type <"~T.stringof~"> during AST encoding");
}