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88 lines
2.6 KiB
ObjectPascal
88 lines
2.6 KiB
ObjectPascal
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//
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// Hoa
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//
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//
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// @license
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//
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// New BSD License
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//
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// Copyright © 2007-2016, Hoa community. 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 met:
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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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// * 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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// * Neither the name of the Hoa nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Grammar \Hoa\Math\Arithmetic.
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//
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// Provide a grammar for arithmetic expressions.
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//
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// @copyright Copyright © 2007-2016 Hoa community.
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// @license New BSD License
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//
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%skip space [\x20\x09]+
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%token bracket_ \(
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%token _bracket \)
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%token comma ,
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%token number (0|[1-9]\d*)(\.\d+)?([eE][\+\-]?\d+)?
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%token plus \+
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%token minus \-|−
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%token times \*|×
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%token div /|÷
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%token constant [A-Z_]+[A-Z0-9_]*
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%token id \w+
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expression:
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primary() ( ::plus:: #addition expression() )?
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primary:
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secondary() ( ::minus:: #substraction expression() )?
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secondary:
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ternary() ( ::times:: #multiplication expression() )?
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ternary:
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term() ( ::div:: #division expression() )?
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term:
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( ::bracket_:: expression() ::_bracket:: #group )
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| number()
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| constant()
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| variable()
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| ( ::minus:: #negative | ::plus:: ) term()
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| function()
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number:
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<number>
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constant:
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<constant>
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#variable:
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<id>
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#function:
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<id> ::bracket_::
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( expression() ( ::comma:: expression() )* )?
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::_bracket::
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