mirror of
git://projects.qi-hardware.com/fped.git
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766efce919
- added string-valued expressions (on-going) - loops, tables, and rows can now be deleted/undeleted (still need columns) git-svn-id: http://svn.openmoko.org/trunk/eda/fped@5397 99fdad57-331a-0410-800a-d7fa5415bdb3
135 lines
2.7 KiB
C
135 lines
2.7 KiB
C
/*
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* expr.h - Expressions and values
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*
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* Written 2009 by Werner Almesberger
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* Copyright 2009 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef EXPR_H
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#define EXPR_H
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#include <math.h>
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#define UNDEF HUGE_VAL
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struct frame;
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struct expr;
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enum num_type {
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nt_none,
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nt_mm,
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nt_mil,
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};
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struct num {
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enum num_type type;
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int exponent;
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double n;
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};
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typedef struct num (*op_type)(const struct expr *self,
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const struct frame *frame);
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struct expr {
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op_type op;
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union {
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struct num num;
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const char *var;
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char *str;
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struct {
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struct expr *a;
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struct expr *b;
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} op;
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} u;
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int lineno;
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};
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extern struct num undef;
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#define is_undef(num) ((num).type == nt_none)
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#define is_dimensionless(num) (!(num).exponent)
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static inline int is_distance(struct num num)
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{
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return (num.type == nt_mm || num.type == nt_mil) && num.exponent == 1;
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}
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void fail_expr(const struct expr *expr);
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const char *str_unit(struct num n);
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static inline struct num make_num(double n)
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{
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struct num res;
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res.type = nt_mm;
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res.exponent = 0;
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res.n = n;
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return res;
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}
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static inline struct num make_mm(double mm)
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{
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struct num res;
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res.type = nt_mm;
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res.exponent = 1;
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res.n = mm;
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return res;
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}
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static inline struct num make_mil(double mil)
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{
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struct num res;
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res.type = nt_mil;
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res.exponent = 1;
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res.n = mil;
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return res;
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}
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int to_unit(struct num *n);
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struct num op_num(const struct expr *self, const struct frame *frame);
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struct num op_var(const struct expr *self, const struct frame *frame);
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struct num op_string(const struct expr *self, const struct frame *frame);
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struct num op_minus(const struct expr *self, const struct frame *frame);
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struct num op_add(const struct expr *self, const struct frame *frame);
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struct num op_sub(const struct expr *self, const struct frame *frame);
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struct num op_mult(const struct expr *self, const struct frame *frame);
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struct num op_div(const struct expr *self, const struct frame *frame);
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struct expr *new_op(op_type op);
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struct expr *binary_op(op_type op, struct expr *a, struct expr *b);
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struct num eval_var(const struct frame *frame, const char *name);
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char *eval_str(const struct frame *frame, const struct expr *expr);
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struct num eval_num(const struct expr *expr, const struct frame *frame);
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/* if frame == NULL, we only check the syntax without expanding */
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char *expand(const char *name, const struct frame *frame);
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struct expr *new_num(struct num num);
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struct expr *parse_expr(const char *s);
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void free_expr(struct expr *expr);
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#endif /* !EXPR_H */
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