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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
namespace PGFSharp
{
/// <summary>
/// The class for concrete syntaxes.
/// </summary>
public class Concr
{
internal IntPtr Ptr { get; private set; }
/// <summary>
/// Abstract grammar for this language.
/// </summary>
public PGF PGF { get; private set; }
private Concr() { }
internal static Concr FromPtr(PGF g, IntPtr ptr)
{
var concr = new Concr();
concr.PGF = g;
concr.Ptr = ptr;
return concr;
}
/// <summary>
/// Name of the grammar.
/// </summary>
public string Name => Native.NativeString.StringFromNativeUtf8(Native.pgf_concrete_name(Ptr));
public override string ToString() => $"Concrete:{Name} of {PGF.Name}";
/// <summary>
/// Parse given input string in the concrete grammar.
/// </summary>
/// <param name="str">Input string to be parsed.</param>
/// <param name="cat">Category (Type) to parse.</param>
/// <param name="heuristics">Heuristic (see the GF C runtime docs).</param>
/// <param name="Callback1">Callback function.</param>
/// <param name="Callback2">Callback function.</param>
/// <returns>Enumerates pairs of (abstract grammar) expressions and corresponding probability.</returns>
public IEnumerable<Tuple<Expr, float>> Parse(string str, Type cat = null, double? heuristics = null,
Action Callback1 = null, Action Callback2 = null)
{
var parse_pool = new NativeGU.NativeMemoryPool();
var exn = new NativeGU.NativeExceptionContext(parse_pool);
cat = cat ?? PGF.StartCat;
using (var nativeStr = new Native.NativeString(str))
{
var result_pool = new NativeGU.NativeMemoryPool();
var callbackMap = Native.pgf_new_callbacks_map(this.Ptr, parse_pool.Ptr);
var iterator = Native.pgf_parse_with_heuristics(this.Ptr, cat.Ptr,
nativeStr.Ptr, heuristics ?? -1, callbackMap,
exn.Ptr, parse_pool.Ptr, result_pool.Ptr);
if (iterator == IntPtr.Zero || exn.IsRaised)
{
throw new ParseError();
}
else
{
foreach (var ptr in NativeGU.IteratorToIEnumerable(iterator, parse_pool.Ptr))
{
var exprProb = (Native.PgfExprProb)Marshal.PtrToStructure(ptr, typeof(Native.PgfExprProb));
yield return Tuple.Create(Expr.FromPtr(exprProb.expr, result_pool),
exprProb.prob);
}
}
}
}
/// <summary>
/// Linearize expression, i.e. produce a string in the concrete grammar from an expression in the abstract grammar.
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
public string Linearize(Expr e)
{
var tmp_pool = new NativeGU.NativeMemoryPool();
var exn = new NativeGU.NativeExceptionContext(tmp_pool);
var buf = NativeGU.gu_new_string_buf(tmp_pool.Ptr);
var out_ = NativeGU.gu_string_buf_out(buf);
Native.pgf_linearize(Ptr, e.Ptr, out_, exn.Ptr);
if (exn.IsRaised)
{
throw new PGFError();
}
else
{
var cstr = NativeGU.gu_string_buf_freeze(buf, tmp_pool.Ptr);
return Native.NativeString.StringFromNativeUtf8(cstr);
}
}
/// <summary>
/// Get all possible linearization for an expression (see <see cref="Linearize(Expression)"/>).
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
public IEnumerable<string> LinearizeAll(Expr e)
{
var tmp_pool = new NativeGU.NativeMemoryPool();
var exn = new NativeGU.NativeExceptionContext(tmp_pool);
var cts = Native.pgf_lzr_concretize(Ptr, e.Ptr, exn.Ptr, tmp_pool.Ptr);
if (exn.IsRaised || cts == IntPtr.Zero) throw new PGFError("Could not linearize the abstract tree.");
return NativeGU.IteratorToIEnumerable(cts, tmp_pool.Ptr).Select(LinearizeCnc);
}
private string LinearizeCnc(IntPtr cnc)
{
var tmp_pool = new NativeGU.NativeMemoryPool();
var exn = new NativeGU.NativeExceptionContext(tmp_pool);
var sbuf = NativeGU.gu_new_string_buf(tmp_pool.Ptr);
var out_ = NativeGU.gu_string_buf_out(sbuf);
var wrapped = Native.pgf_lzr_wrap_linref(cnc, tmp_pool.Ptr);
Native.pgf_lzr_linearize_simple(Ptr, wrapped, 0, out_, exn.Ptr, tmp_pool.Ptr);
if (exn.IsRaised) throw new PGFError("Could not linearize abstract tree.");
var cstr = NativeGU.gu_string_buf_freeze(sbuf, tmp_pool.Ptr);
return Native.NativeString.StringFromNativeUtf8(cstr);
}
/// <summary>
/// Get the bracketed (structured) linearization of an expression.
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
public Bracket BracketedLinearize(Expr e)
{
var tmp_pool = new NativeGU.NativeMemoryPool();
var exn = new NativeGU.NativeExceptionContext(tmp_pool);
var cts = Native.pgf_lzr_concretize(Ptr, e.Ptr, exn.Ptr, tmp_pool.Ptr);
var ctree = IntPtr.Zero;
NativeGU.gu_enum_next(cts, ref ctree, tmp_pool.Ptr);
if (ctree == IntPtr.Zero)
{
return null;
}
ctree = Native.pgf_lzr_wrap_linref(ctree, tmp_pool.Ptr);
var builder = new Bracket.BracketBuilder();
var mem = Marshal.AllocHGlobal(Marshal.SizeOf<Native.PgfLinFuncs>());
Marshal.StructureToPtr<Native.PgfLinFuncs>(builder.LinFuncs, mem, false);
Native.pgf_lzr_linearize(Ptr, ctree, 0, ref mem, tmp_pool.Ptr);
var b = builder.Build();
Marshal.FreeHGlobal(mem);
return b;
}
}
}
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