9a9e06554e
What this means is that the utility code, basic math, value expressions, string formatting and option handling are now entirely decoupled from the rest of the code. This decoupling not only greatly simplifies the more basic parts of Ledger, but makes it much easier to test and verify its completeness. For example, when the formatting code %X is seen by the format parser, it turns into a call to the expression function fmt_X, which must be defined when the format string is first compiled against an object. If that object is a transaction, the transaction's scope will be the first to have a chance at providing a definition. If an account is being reported, it will. If neither does, the next scope in sequence -- soon to be the current report -- will, and then the session object that "owns" the current Ledger session. In 2.6, the formatting code new everything about transaction and accounts, and relied on flags to communicate special details between them. Now the transaction will offer the details for its own reporting, while the formatter worries only about strings and how to output them.
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
/*
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* Copyright (c) 2003-2008, John Wiegley. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of New Artisans LLC nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _PREDICATE_H
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#define _PREDICATE_H
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#include "expr.h"
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#include "scope.h"
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namespace ledger {
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template <typename T>
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class item_predicate
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{
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public:
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expr_t predicate;
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item_predicate() {
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TRACE_CTOR(item_predicate, "");
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}
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item_predicate(const item_predicate& other) : predicate(other.predicate) {
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TRACE_CTOR(item_predicate, "copy");
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}
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item_predicate(const expr_t& _predicate) : predicate(_predicate) {
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TRACE_CTOR(item_predicate, "const expr_t&");
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}
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item_predicate(const string& _predicate) : predicate(expr_t(_predicate)) {
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TRACE_CTOR(item_predicate, "const string&");
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}
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~item_predicate() throw() {
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TRACE_DTOR(item_predicate);
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}
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bool operator()(T& item) {
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return ! predicate || predicate.calc(item).strip_annotations();
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}
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};
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} // namespace ledger
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#endif // _PREDICATE_H
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