43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
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#ifndef __EXPR_H__
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#define __EXPR_H__
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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typedef struct {
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size_t start, end;
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const char *err;
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} ExprError;
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typedef struct {
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const char *name;
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const char *description;
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double (*func)(double *args);
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const char **arg_names;
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size_t n_args;
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} ExprBuiltinFunc;
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typedef struct {
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const char *name;
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const char *description;
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double val;
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} ExprBuiltinVar;
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typedef struct _Expr Expr;
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extern ExprBuiltinFunc *expr_builtin_funcs;
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extern const size_t expr_n_builtin_funcs;
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extern ExprBuiltinVar *expr_builtin_vars;
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extern const size_t expr_n_builtin_vars;
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Expr *expr_new();
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void expr_destroy(Expr *e);
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ExprError expr_set(Expr *e, const char *expr) __attribute__((warn_unused_result));
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ExprError expr_eval(Expr *e, double *out_res) __attribute__((warn_unused_result));
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void expr_set_var(Expr *e, const char *name, double val);
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bool expr_get_var(Expr *e, const char *name, double *out); /* Returns false if not present */
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void expr_set_func(Expr *e, const char *name, double (*func)(double *args), size_t n_args);
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#endif /* __EXPR_H__ */
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