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/*
* Copyright (c) 2003-2008, John Wiegley. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of New Artisans LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "scope.h"
namespace ledger {
void symbol_scope_t::define(const string& name, expr_t::ptr_op_t def)
{
DEBUG("ledger.xpath.syms", "Defining '" << name << "' = " << def);
std::pair<symbol_map::iterator, bool> result
= symbols.insert(symbol_map::value_type(name, def));
if (! result.second) {
symbol_map::iterator i = symbols.find(name);
assert(i != symbols.end());
symbols.erase(i);
std::pair<symbol_map::iterator, bool> result2
= symbols.insert(symbol_map::value_type(name, def));
if (! result2.second)
throw_(compile_error,
"Redefinition of '" << name << "' in same scope");
}
}
expr_t::ptr_op_t symbol_scope_t::lookup(const string& name)
{
symbol_map::const_iterator i = symbols.find(name);
if (i != symbols.end())
return (*i).second;
return child_scope_t::lookup(name);
}
#if 0
namespace {
int count_leaves(expr_t::ptr_op_t expr)
{
int count = 0;
if (expr->kind != expr_t::op_t::O_COMMA) {
count = 1;
} else {
count += count_leaves(expr->left());
count += count_leaves(expr->right());
}
return count;
}
expr_t::ptr_op_t reduce_leaves(expr_t::ptr_op_t expr,
expr_t::ptr_op_t context)
{
if (! expr)
return NULL;
expr_t::ptr_op_t temp;
if (expr->kind != expr_t::op_t::O_COMMA) {
if (expr->kind < expr_t::op_t::TERMINALS) {
temp.reset(expr);
} else {
temp.reset(new op_t(expr_t::op_t::VALUE));
temp->set_value(NULL_VALUE);
expr->compute(temp->as_value_lval(), context);
}
} else {
temp.reset(new op_t(expr_t::op_t::O_COMMA));
temp->set_left(reduce_leaves(expr->left(), context));
temp->set_right(reduce_leaves(expr->right(), context));
}
return temp.release();
}
expr_t::ptr_op_t find_leaf(expr_t::ptr_op_t context, int goal, long& found)
{
if (! context)
return NULL;
if (context->kind != expr_t::op_t::O_COMMA) {
if (goal == found++)
return context;
} else {
expr_t::ptr_op_t expr = find_leaf(context->left(), goal, found);
if (expr)
return expr;
expr = find_leaf(context->right(), goal, found);
if (expr)
return expr;
}
return NULL;
}
}
#endif
} // namespace ledger
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