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| -rw-r--r-- | slideshow/source/inc/smilfunctionparser.hxx | 155 |
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diff --git a/slideshow/source/inc/smilfunctionparser.hxx b/slideshow/source/inc/smilfunctionparser.hxx new file mode 100644 index 000000000..d2ef96abf --- /dev/null +++ b/slideshow/source/inc/smilfunctionparser.hxx @@ -0,0 +1,155 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_SMILFUNCTIONPARSER_HXX +#define INCLUDED_SLIDESHOW_SOURCE_INC_SMILFUNCTIONPARSER_HXX + +#include "expressionnode.hxx" + +#include <basegfx/range/b2drectangle.hxx> +#include <rtl/ustring.hxx> + +#include <memory> + + +/* Definition of SmilFunctionParser class */ + +namespace slideshow::internal + { + class SmilFunctionParser + { + public: + SmilFunctionParser() = delete; + SmilFunctionParser(const SmilFunctionParser&) = delete; + SmilFunctionParser& operator=(const SmilFunctionParser&) = delete; + + /** Parse a string containing a SMIL value. + + This method parses a string representing + a fixed value (i.e. a value that does not + change by time). Due to the dynamic view + capabilities of the presentation engine, + this value can sometimes only be determined + during runtime of the animation (because + e.g. mixed screen/view coordinates are + involved), and is thus still returned as an + ExpressionNode object. An example for + such a case is the "Width+1.0" string, which + contains the width of the shape in user + coordinate space, and the screen width + in device coordinate space. + + The following grammar is accepted by this method: + <code> + identifier = 'pi'|'e'|'X'|'Y'|'Width'|'Height' + + function = 'abs'|'sqrt'|'sin'|'cos'|'tan'|'atan'|'acos'|'asin'|'exp'|'log' + + basic_expression = + number | + identifier | + function '(' additive_expression ')' | + '(' additive_expression ')' + + unary_expression = + '-' basic_expression | + basic_expression + + multiplicative_expression = + unary_expression ( ( '*' unary_expression )* | + ( '/' unary_expression )* ) + + additive_expression = + multiplicative_expression ( ( '+' multiplicative_expression )* | + ( '-' multiplicative_expression )* ) + + </code> + + @param rSmilValue + The string to parse + + @param rRelativeShapeBounds + The bounds of the shape this SMIL value is to be + evaluated for. The bounds must be <em>relative</em> to + the page the shape is part of, i.e. within the [0,1] + range. This is necessary, since the string might + contain symbolic references to the shape bounding box. + + @throws ParseError if an invalid expression is given. + + @return the generated function object. + */ + static std::shared_ptr<ExpressionNode> const & parseSmilValue( const OUString& rSmilValue, + const ::basegfx::B2DRectangle& rRelativeShapeBounds ); // throw ParseError + + /** Parse a string containing a SMIL function. + + This method parses a string representing + a possibly time-varying SMIL function. + + The following grammar is accepted by this method: + <code> + identifier = 't'|'pi'|'e'|'X'|'Y'|'Width'|'Height' + + function = 'abs'|'sqrt'|'sin'|'cos'|'tan'|'atan'|'acos'|'asin'|'exp'|'log' + + basic_expression = + number | + identifier | + function '(' additive_expression ')' | + '(' additive_expression ')' + + unary_expression = + '-' basic_expression | + basic_expression + + multiplicative_expression = + unary_expression ( ( '*' unary_expression )* | + ( '/' unary_expression )* ) + + additive_expression = + multiplicative_expression ( ( '+' multiplicative_expression )* | + ( '-' multiplicative_expression )* ) + + </code> + + @param rSmilFunction + The string to parse + + @param rRelativeShapeBounds + The bounds of the shape this SMIL value is to be + evaluated for. The bounds must be <em>relative</em> to + the page the shape is part of, i.e. within the [0,1] + range. This is necessary, since the string might + contain symbolic references to the shape bounding box. + + @throws ParseError if an invalid expression is given. + + @return the generated function object. + */ + static std::shared_ptr<ExpressionNode> const & parseSmilFunction( const OUString& rSmilFunction, + const ::basegfx::B2DRectangle& rRelativeShapeBounds ); // throw ParseError + + }; + +} + +#endif // INCLUDED_SLIDESHOW_SOURCE_INC_SMILFUNCTIONPARSER_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |