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/*
* Copyright 2010-2011 University of Helsinki.
*
* This file is part of libpgf.
*
* Libpgf is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* Libpgf is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with libpgf. If not, see <http://www.gnu.org/licenses/>.
*/
#include <gu/type.h>
#include <gu/dump.h>
#include <gu/enum.h>
/// Linearization of abstract syntax trees.
/// @file
/** @}
*
* @name Enumerating concrete syntax trees
*
* Because of the \c variants construct in GF, there may be several
* possible concrete syntax trees that correspond to a given abstract
* syntax tree. These can be enumerated with #pgf_lzr_concretize and
* #pgf_cnc_trees_next.
*
* @{
*/
/// A concrete syntax tree
typedef GuVariant PgfCncTree;
/// An enumeration of #PgfCncTree trees.
typedef GuEnum PgfCncTreeEnum;
/// Begin enumerating concrete syntax variants.
PgfCncTreeEnum*
pgf_lzr_concretize(PgfConcr* concr, PgfExpr expr, GuPool* pool);
typedef struct PgfLinFuncs PgfLinFuncs;
struct PgfLinFuncs
{
/// Output tokens
void (*symbol_tokens)(PgfLinFuncs** self, PgfTokens toks);
/// Output literal
void (*expr_literal)(PgfLinFuncs** self, PgfLiteral lit);
/// Begin phrase
void (*begin_phrase)(PgfLinFuncs** self, PgfCId cat, int fid, int lindex, PgfCId fun);
/// End phrase
void (*end_phrase)(PgfLinFuncs** self, PgfCId cat, int fid, int lindex, PgfCId fun);
};
/// Linearize a concrete syntax tree.
void
pgf_lzr_linearize(PgfConcr* concr, PgfCncTree ctree, size_t lin_idx,
PgfLinFuncs** fnsp);
/// Linearize a concrete syntax tree as space-separated tokens.
void
pgf_lzr_linearize_simple(PgfConcr* concr, PgfCncTree ctree,
size_t lin_idx, GuWriter* wtr, GuExn* err);
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