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56 lines
2.3 KiB
C
56 lines
2.3 KiB
C
#ifndef __eval_expr_h__
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#define __eval_expr_h__
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/*-
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* Copyright (c) 2015 Netflix, Inc.
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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
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* are met:
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* 1. 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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* in this position and unchanged.
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* 2. 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT 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 OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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enum exptype {
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TYPE_OP_PLUS,
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TYPE_OP_MINUS,
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TYPE_OP_MULT,
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TYPE_OP_DIVIDE,
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TYPE_PARN_OPEN,
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TYPE_PARN_CLOSE,
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TYPE_VALUE_CON,
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TYPE_VALUE_PMC
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};
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#define STATE_UNSET 0 /* We have no setting yet in value */
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#define STATE_FILLED 1 /* We have filled in value */
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struct expression {
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struct expression *next; /* Next in expression. */
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struct expression *prev; /* Prev in expression. */
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double value; /* If there is a value to set */
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enum exptype type; /* What is it */
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uint8_t state; /* Current state if value type */
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char name[252]; /* If a PMC whats the name, con value*/
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};
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struct expression *parse_expression(char *str);
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double run_expr(struct expression *exp, int initial_call, struct expression **lastone);
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void print_exp(struct expression *exp);
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#endif
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