155 lines
6.3 KiB
C++
155 lines
6.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_SMILFUNCTIONPARSER_HXX
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#define INCLUDED_SLIDESHOW_SOURCE_INC_SMILFUNCTIONPARSER_HXX
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#include "expressionnode.hxx"
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#include <basegfx/range/b2drectangle.hxx>
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#include <rtl/ustring.hxx>
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#include <memory>
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/* Definition of SmilFunctionParser class */
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namespace slideshow::internal
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{
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class SmilFunctionParser
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{
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public:
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SmilFunctionParser() = delete;
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SmilFunctionParser(const SmilFunctionParser&) = delete;
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SmilFunctionParser& operator=(const SmilFunctionParser&) = delete;
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/** Parse a string containing a SMIL value.
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This method parses a string representing
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a fixed value (i.e. a value that does not
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change by time). Due to the dynamic view
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capabilities of the presentation engine,
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this value can sometimes only be determined
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during runtime of the animation (because
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e.g. mixed screen/view coordinates are
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involved), and is thus still returned as an
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ExpressionNode object. An example for
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such a case is the "Width+1.0" string, which
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contains the width of the shape in user
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coordinate space, and the screen width
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in device coordinate space.
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The following grammar is accepted by this method:
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<code>
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identifier = 'pi'|'e'|'X'|'Y'|'Width'|'Height'
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function = 'abs'|'sqrt'|'sin'|'cos'|'tan'|'atan'|'acos'|'asin'|'exp'|'log'
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basic_expression =
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number |
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identifier |
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function '(' additive_expression ')' |
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'(' additive_expression ')'
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unary_expression =
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'-' basic_expression |
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basic_expression
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multiplicative_expression =
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unary_expression ( ( '*' unary_expression )* |
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( '/' unary_expression )* )
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additive_expression =
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multiplicative_expression ( ( '+' multiplicative_expression )* |
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( '-' multiplicative_expression )* )
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</code>
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@param rSmilValue
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The string to parse
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@param rRelativeShapeBounds
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The bounds of the shape this SMIL value is to be
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evaluated for. The bounds must be <em>relative</em> to
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the page the shape is part of, i.e. within the [0,1]
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range. This is necessary, since the string might
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contain symbolic references to the shape bounding box.
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@throws ParseError if an invalid expression is given.
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@return the generated function object.
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*/
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static std::shared_ptr<ExpressionNode> const & parseSmilValue( const OUString& rSmilValue,
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const ::basegfx::B2DRectangle& rRelativeShapeBounds ); // throw ParseError
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/** Parse a string containing a SMIL function.
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This method parses a string representing
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a possibly time-varying SMIL function.
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The following grammar is accepted by this method:
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<code>
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identifier = 't'|'pi'|'e'|'X'|'Y'|'Width'|'Height'
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function = 'abs'|'sqrt'|'sin'|'cos'|'tan'|'atan'|'acos'|'asin'|'exp'|'log'
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basic_expression =
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number |
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identifier |
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function '(' additive_expression ')' |
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'(' additive_expression ')'
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unary_expression =
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'-' basic_expression |
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basic_expression
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multiplicative_expression =
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unary_expression ( ( '*' unary_expression )* |
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( '/' unary_expression )* )
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additive_expression =
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multiplicative_expression ( ( '+' multiplicative_expression )* |
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( '-' multiplicative_expression )* )
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</code>
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@param rSmilFunction
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The string to parse
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@param rRelativeShapeBounds
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The bounds of the shape this SMIL value is to be
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evaluated for. The bounds must be <em>relative</em> to
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the page the shape is part of, i.e. within the [0,1]
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range. This is necessary, since the string might
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contain symbolic references to the shape bounding box.
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@throws ParseError if an invalid expression is given.
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@return the generated function object.
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*/
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static std::shared_ptr<ExpressionNode> const & parseSmilFunction( const OUString& rSmilFunction,
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const ::basegfx::B2DRectangle& rRelativeShapeBounds ); // throw ParseError
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};
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}
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#endif // INCLUDED_SLIDESHOW_SOURCE_INC_SMILFUNCTIONPARSER_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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