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set() function + userdata storage + Expr instance access for functions

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- functions can take string arguments (i.e. variable names that may be
  undefined)

- set(<varname>, <value>) sets a variable to a user-defined value

- any userdata can be stored via expr_set_userdata() and retrieved via
  expr_get_userdata(); also accessible to functions

- functions gain access to the expr instance and consequently all
  of its variables including userdata
This commit is contained in:
r4 2022-09-12 20:16:53 +02:00
parent 824153a9df
commit dd918e6208
3 changed files with 124 additions and 79 deletions
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44
expr.c
View File

@ -35,14 +35,15 @@ typedef struct {
}; };
} Tok; } Tok;
typedef struct Var { typedef struct {
char *name; char *name;
double val; double val;
} Var; } Var;
typedef struct Func { typedef struct {
char *name; char *name;
double (*func)(double *args); double (*func)(Expr *e, ExprArg *args);
ExprArgType *arg_types;
size_t n_args; size_t n_args;
} Func; } Func;
@ -60,6 +61,8 @@ struct _Expr {
Func *funcs; Func *funcs;
size_t funcs_len; size_t funcs_len;
size_t funcs_cap; size_t funcs_cap;
void *userdata;
}; };
static size_t smap_get_idx(void *smap, const char *key, size_t type_size, size_t cap); static size_t smap_get_idx(void *smap, const char *key, size_t type_size, size_t cap);
@ -106,7 +109,7 @@ Expr *expr_new() {
Expr *res = malloc(sizeof(Expr)); Expr *res = malloc(sizeof(Expr));
*res = (Expr){0}; *res = (Expr){0};
for (size_t i = 0; i < expr_n_builtin_funcs; i++) { for (size_t i = 0; i < expr_n_builtin_funcs; i++) {
expr_set_func(res, expr_builtin_funcs[i].name, expr_builtin_funcs[i].func, expr_builtin_funcs[i].n_args); expr_set_func(res, expr_builtin_funcs[i].name, expr_builtin_funcs[i].func, expr_builtin_funcs[i].arg_types, expr_builtin_funcs[i].n_args);
} }
for (size_t i = 0; i < expr_n_builtin_vars; i++) { for (size_t i = 0; i < expr_n_builtin_vars; i++) {
expr_set_var(res, expr_builtin_vars[i].name, expr_builtin_vars[i].val); expr_set_var(res, expr_builtin_vars[i].name, expr_builtin_vars[i].val);
@ -206,12 +209,21 @@ bool expr_get_var(Expr *e, const char *name, double *out) {
return v.name != NULL; return v.name != NULL;
} }
void expr_set_func(Expr *e, const char *name, double (*func)(double *args), size_t n_args) { void expr_set_func(Expr *e, const char *name, double (*func)(Expr *e, ExprArg *args), ExprArgType *arg_types, size_t n_args) {
Func *v = smap_get_for_setting((void**)&e->funcs, name, sizeof(Func), &e->funcs_len, &e->funcs_cap); Func *v = smap_get_for_setting((void**)&e->funcs, name, sizeof(Func), &e->funcs_len, &e->funcs_cap);
v->func = func; v->func = func;
v->arg_types = arg_types;
v->n_args = n_args; v->n_args = n_args;
} }
void expr_set_userdata(Expr *e, void *userdata) {
e->userdata = userdata;
}
void *expr_get_userdata(Expr *e) {
return e->userdata;
}
static void del_toks(Expr *e, Tok *start, Tok *end) { static void del_toks(Expr *e, Tok *start, Tok *end) {
memmove(start, end, (e->toks_working_len - (end - e->toks_working)) * sizeof(Tok)); memmove(start, end, (e->toks_working_len - (end - e->toks_working)) * sizeof(Tok));
e->toks_working_len -= end - start; e->toks_working_len -= end - start;
@ -244,15 +256,26 @@ static ExprError collapse(Expr *e, Tok *t) {
if (t[1].kind == TokIdent) { if (t[1].kind == TokIdent) {
if (t + 2 < e->toks_working + e->toks_working_len && (t[2].kind == TokOp && t[2].Char == '(')) { if (t + 2 < e->toks_working + e->toks_working_len && (t[2].kind == TokOp && t[2].Char == '(')) {
/* Collapse function. */ /* Collapse function. */
double arg_results[16]; ExprArg arg_results[16];
size_t arg_results_size = 0; size_t arg_results_size = 0;
Func func = get_func(e, t[1].Str);
if (func.name == NULL)
return (ExprError){.start = t[1].start, .end = t[1].end, .err = "unknown function"};
t += 2; t += 2;
while (1) { while (1) {
if (arg_results_size < 16) { if (arg_results_size < 16) {
if (func.arg_types[arg_results_size] == ExprArgTypeNum) {
double res; double res;
TRY(eval(e, t, &res)); TRY(eval(e, t, &res));
arg_results[arg_results_size++] = res; arg_results[arg_results_size++].Num = res;
} else if (func.arg_types[arg_results_size] == ExprArgTypeStr) {
if (t[1].kind != TokIdent)
return (ExprError){.start = t[1].start, .end = t[1].end, .err = "expected string argument"};
arg_results[arg_results_size++].Str = t[1].Str;
}
} }
size_t i = 1; size_t i = 1;
for (; !(t[i].kind == TokOp && OP_PREC(t[i].Char) == 0); i++); for (; !(t[i].kind == TokOp && OP_PREC(t[i].Char) == 0); i++);
@ -266,14 +289,11 @@ static ExprError collapse(Expr *e, Tok *t) {
} }
t -= 2; t -= 2;
Func func = get_func(e, t[1].Str);
if (func.name == NULL)
return (ExprError){.start = t[1].start, .end = t[1].end, .err = "unknown function"};
if (arg_results_size != func.n_args) if (arg_results_size != func.n_args)
return (ExprError){.start = t[1].start, .end = t[1].end, .err = "invalid number of arguments to function"}; return (ExprError){.start = t[1].start, .end = t[1].end, .err = "invalid number of arguments to function"};
t[1].kind = TokNum; t[1].kind = TokNum;
t[1].Num = func.func(arg_results); t[1].Num = func.func(e, arg_results);
} else { } else {
/* Collapse variable. */ /* Collapse variable. */
t[1].kind = TokNum; t[1].kind = TokNum;
@ -293,7 +313,7 @@ static ExprError eval(Expr *e, Tok *t, double *out_res) {
TRY(collapse(e, t)); TRY(collapse(e, t));
if (!(t[0].kind == TokOp && t[1].kind == TokNum && t[2].kind == TokOp)) { if (!(t[0].kind == TokOp && t[1].kind == TokNum && t[2].kind == TokOp)) {
return (ExprError){.start = t[0].start, .end = t[1].end, .err = "invalid token order"}; return (ExprError){.start = t[0].start, .end = t[1].end, .err = "unexpected token"};
} }
const char curr_op = t[0].Char; const char curr_op = t[0].Char;

21
expr.h
View File

@ -5,16 +5,29 @@
#include <stddef.h> #include <stddef.h>
#include <stdint.h> #include <stdint.h>
typedef struct _Expr Expr;
typedef struct { typedef struct {
size_t start, end; size_t start, end;
const char *err; const char *err;
} ExprError; } ExprError;
typedef enum {
ExprArgTypeStr,
ExprArgTypeNum,
} ExprArgType;
typedef union {
char *Str;
double Num;
} ExprArg;
typedef struct { typedef struct {
const char *name; const char *name;
const char *description; const char *description;
double (*func)(double *args); double (*func)(Expr *e, ExprArg *args);
const char **arg_names; const char **arg_names;
ExprArgType *arg_types;
size_t n_args; size_t n_args;
} ExprBuiltinFunc; } ExprBuiltinFunc;
@ -24,8 +37,6 @@ typedef struct {
double val; double val;
} ExprBuiltinVar; } ExprBuiltinVar;
typedef struct _Expr Expr;
extern ExprBuiltinFunc *expr_builtin_funcs; extern ExprBuiltinFunc *expr_builtin_funcs;
extern const size_t expr_n_builtin_funcs; extern const size_t expr_n_builtin_funcs;
extern ExprBuiltinVar *expr_builtin_vars; extern ExprBuiltinVar *expr_builtin_vars;
@ -37,6 +48,8 @@ ExprError expr_set(Expr *e, const char *expr) __attribute__((warn_unused_result)
ExprError expr_eval(Expr *e, double *out_res) __attribute__((warn_unused_result)); ExprError expr_eval(Expr *e, double *out_res) __attribute__((warn_unused_result));
void expr_set_var(Expr *e, const char *name, double val); void expr_set_var(Expr *e, const char *name, double val);
bool expr_get_var(Expr *e, const char *name, double *out); /* Returns false if not present */ bool expr_get_var(Expr *e, const char *name, double *out); /* Returns false if not present */
void expr_set_func(Expr *e, const char *name, double (*func)(double *args), size_t n_args); void expr_set_func(Expr *e, const char *name, double (*func)(Expr *e, ExprArg *args), ExprArgType *arg_types, size_t n_args);
void expr_set_userdata(Expr *e, void *userdata);
void *expr_get_userdata(Expr *e);
#endif /* __EXPR_H__ */ #endif /* __EXPR_H__ */

128
expr_config.h
View File

@ -2,70 +2,82 @@
#error expr_config.h should not be imported by any files other than expr.c #error expr_config.h should not be imported by any files other than expr.c
#endif #endif
static double fn_sqrt(double *args) {return sqrt(args[0]); } static double fn_sqrt(Expr *e, ExprArg *args) {return sqrt(args[0].Num); }
static double fn_cbrt(double *args) {return cbrt(args[0]); } static double fn_cbrt(Expr *e, ExprArg *args) {return cbrt(args[0].Num); }
static double fn_pow(double *args) {return pow(args[0], args[1]); } static double fn_pow(Expr *e, ExprArg *args) {return pow(args[0].Num, args[1].Num); }
static double fn_exp(double *args) {return exp(args[0]); } static double fn_exp(Expr *e, ExprArg *args) {return exp(args[0].Num); }
static double fn_ln(double *args) {return log(args[0]); } static double fn_ln(Expr *e, ExprArg *args) {return log(args[0].Num); }
static double fn_log(double *args) {return log(args[1]) / log(args[0]);} static double fn_log(Expr *e, ExprArg *args) {return log(args[1].Num) / log(args[0].Num);}
static double fn_mod(double *args) {return fmod(args[0], args[1]); } static double fn_mod(Expr *e, ExprArg *args) {return fmod(args[0].Num, args[1].Num); }
static double fn_round(double *args) {return round(args[0]); } static double fn_round(Expr *e, ExprArg *args) {return round(args[0].Num); }
static double fn_floor(double *args) {return floor(args[0]); } static double fn_floor(Expr *e, ExprArg *args) {return floor(args[0].Num); }
static double fn_ceil(double *args) {return ceil(args[0]); } static double fn_ceil(Expr *e, ExprArg *args) {return ceil(args[0].Num); }
static double fn_sin(double *args) {return sin(args[0]); } static double fn_sin(Expr *e, ExprArg *args) {return sin(args[0].Num); }
static double fn_cos(double *args) {return cos(args[0]); } static double fn_cos(Expr *e, ExprArg *args) {return cos(args[0].Num); }
static double fn_tan(double *args) {return tan(args[0]); } static double fn_tan(Expr *e, ExprArg *args) {return tan(args[0].Num); }
static double fn_asin(double *args) {return asin(args[0]); } static double fn_asin(Expr *e, ExprArg *args) {return asin(args[0].Num); }
static double fn_acos(double *args) {return acos(args[0]); } static double fn_acos(Expr *e, ExprArg *args) {return acos(args[0].Num); }
static double fn_atan(double *args) {return atan(args[0]); } static double fn_atan(Expr *e, ExprArg *args) {return atan(args[0].Num); }
static double fn_sinh(double *args) {return sinh(args[0]); } static double fn_sinh(Expr *e, ExprArg *args) {return sinh(args[0].Num); }
static double fn_cosh(double *args) {return cosh(args[0]); } static double fn_cosh(Expr *e, ExprArg *args) {return cosh(args[0].Num); }
static double fn_tanh(double *args) {return tanh(args[0]); } static double fn_tanh(Expr *e, ExprArg *args) {return tanh(args[0].Num); }
static double fn_asinh(double *args) {return asinh(args[0]); } static double fn_asinh(Expr *e, ExprArg *args) {return asinh(args[0].Num); }
static double fn_acosh(double *args) {return acosh(args[0]); } static double fn_acosh(Expr *e, ExprArg *args) {return acosh(args[0].Num); }
static double fn_atanh(double *args) {return atanh(args[0]); } static double fn_atanh(Expr *e, ExprArg *args) {return atanh(args[0].Num); }
static double fn_abs(double *args) {return fabs(args[0]); } static double fn_abs(Expr *e, ExprArg *args) {return fabs(args[0].Num); }
static double fn_hypot(double *args) {return hypot(args[0], args[1]); } static double fn_hypot(Expr *e, ExprArg *args) {return hypot(args[0].Num, args[1].Num); }
static double fn_polar(double *args) {return atan2(args[1], args[0]); } static double fn_polar(Expr *e, ExprArg *args) {return atan2(args[1].Num, args[0].Num); }
static double fn_max(double *args) {return fmax(args[0], args[1]); } static double fn_max(Expr *e, ExprArg *args) {return fmax(args[0].Num, args[1].Num); }
static double fn_min(double *args) {return fmin(args[0], args[1]); } static double fn_min(Expr *e, ExprArg *args) {return fmin(args[0].Num, args[1].Num); }
static double fn_rad(double *args) {return args[0] / M_PI * 180.0; } static double fn_rad(Expr *e, ExprArg *args) {return args[0].Num / M_PI * 180.0; }
static double fn_deg(double *args) {return args[0] / 180.0 * M_PI; } static double fn_deg(Expr *e, ExprArg *args) {return args[0].Num / 180.0 * M_PI; }
static double fn_set(Expr *e, ExprArg *args) {
expr_set_var(e, args[0].Str, args[1].Num);
return args[1].Num;
}
static ExprArgType arg_types_n[] = {ExprArgTypeNum };
static ExprArgType arg_types_nn[] = {ExprArgTypeNum, ExprArgTypeNum};
static ExprArgType arg_types_sn[] = {ExprArgTypeStr, ExprArgTypeNum};
static const char *arg_names_x[] = {"x" }; static const char *arg_names_x[] = {"x" };
static const char *arg_names_xy[] = {"x", "y" }; static const char *arg_names_xy[] = {"x", "y" };
static const char *arg_names_nx[] = {"n", "x" }; static const char *arg_names_nx[] = {"n", "x" };
static const char *arg_names_name_val[] = {"name", "value"};
static ExprBuiltinFunc _builtin_funcs[] = { static ExprBuiltinFunc _builtin_funcs[] = {
{"sqrt", "square root of x", fn_sqrt, arg_names_x, 1}, {"sqrt", "square root of x", fn_sqrt, arg_names_x, arg_types_n, 1},
{"cbrt", "cube root of x", fn_cbrt, arg_names_x, 1}, {"cbrt", "cube root of x", fn_cbrt, arg_names_x, arg_types_n, 1},
{"pow", "x^y", fn_pow, arg_names_xy, 2}, {"pow", "x^y", fn_pow, arg_names_xy, arg_types_nn, 2},
{"exp", "e^x", fn_exp, arg_names_x, 1}, {"exp", "e^x", fn_exp, arg_names_x, arg_types_n, 1},
{"ln", "natural log (base e) of x", fn_ln, arg_names_x, 1}, {"ln", "natural log (base e) of x", fn_ln, arg_names_x, arg_types_n, 1},
{"log", "log (base n) of x", fn_log, arg_names_nx, 2}, {"log", "log (base n) of x", fn_log, arg_names_nx, arg_types_nn, 2},
{"mod", "x%y", fn_mod, arg_names_xy, 2}, {"mod", "x%y", fn_mod, arg_names_xy, arg_types_nn, 2},
{"round", "closest integer to x", fn_round, arg_names_x, 1}, {"round", "closest integer to x", fn_round, arg_names_x, arg_types_n, 1},
{"floor", "greatest integer less than x", fn_floor, arg_names_x, 1}, {"floor", "greatest integer less than x", fn_floor, arg_names_x, arg_types_n, 1},
{"ceil", "smallest integer grater than x", fn_ceil, arg_names_x, 1}, {"ceil", "smallest integer grater than x", fn_ceil, arg_names_x, arg_types_n, 1},
{"sin", "sine of x", fn_sin, arg_names_x, 1}, {"sin", "sine of x", fn_sin, arg_names_x, arg_types_n, 1},
{"cos", "cosine of x", fn_cos, arg_names_x, 1}, {"cos", "cosine of x", fn_cos, arg_names_x, arg_types_n, 1},
{"tan", "tangent of x", fn_tan, arg_names_x, 1}, {"tan", "tangent of x", fn_tan, arg_names_x, arg_types_n, 1},
{"asin", "inverse sine of x", fn_asin, arg_names_x, 1}, {"asin", "inverse sine of x", fn_asin, arg_names_x, arg_types_n, 1},
{"acos", "inverse cosine of x", fn_acos, arg_names_x, 1}, {"acos", "inverse cosine of x", fn_acos, arg_names_x, arg_types_n, 1},
{"atan", "inverse tangent of x", fn_atan, arg_names_x, 1}, {"atan", "inverse tangent of x", fn_atan, arg_names_x, arg_types_n, 1},
{"sinh", "hyperbolic sine of x", fn_sinh, arg_names_x, 1}, {"sinh", "hyperbolic sine of x", fn_sinh, arg_names_x, arg_types_n, 1},
{"cosh", "hyperbolic cosine of x", fn_cosh, arg_names_x, 1}, {"cosh", "hyperbolic cosine of x", fn_cosh, arg_names_x, arg_types_n, 1},
{"tanh", "hyperbolic tangent of x", fn_tanh, arg_names_x, 1}, {"tanh", "hyperbolic tangent of x", fn_tanh, arg_names_x, arg_types_n, 1},
{"asinh", "inverse hyperbolic sine of x", fn_asinh, arg_names_x, 1}, {"asinh", "inverse hyperbolic sine of x", fn_asinh, arg_names_x, arg_types_n, 1},
{"acosh", "inverse hyperbolic cosine of x", fn_acosh, arg_names_x, 1}, {"acosh", "inverse hyperbolic cosine of x", fn_acosh, arg_names_x, arg_types_n, 1},
{"atanh", "inverse hyperbolic tangent of x", fn_atanh, arg_names_x, 1}, {"atanh", "inverse hyperbolic tangent of x", fn_atanh, arg_names_x, arg_types_n, 1},
{"abs", "absolute value of x", fn_abs, arg_names_x, 1}, {"abs", "absolute value of x", fn_abs, arg_names_x, arg_types_n, 1},
{"hypot", "sqrt(x^2+y^2)", fn_hypot, arg_names_xy, 2}, {"hypot", "sqrt(x^2+y^2)", fn_hypot, arg_names_xy, arg_types_nn, 2},
{"polar", "polar coordinates to radians", fn_polar, arg_names_xy, 2}, {"polar", "polar coordinates to radians", fn_polar, arg_names_xy, arg_types_nn, 2},
{"max", "the greater value of x and y", fn_max, arg_names_xy, 2}, {"max", "the greater value of x and y", fn_max, arg_names_xy, arg_types_nn, 2},
{"min", "the smaller value of x and y", fn_min, arg_names_xy, 2}, {"min", "the smaller value of x and y", fn_min, arg_names_xy, arg_types_nn, 2},
{"rad", "x (radians) to degrees", fn_rad, arg_names_x, 1}, {"rad", "x (radians) to degrees", fn_rad, arg_names_x, arg_types_n, 1},
{"deg", "x (degrees) to radians", fn_deg, arg_names_x, 1}, {"deg", "x (degrees) to radians", fn_deg, arg_names_x, arg_types_n, 1},
{"set", "(re-)set the value of a variable", fn_set, arg_names_name_val, arg_types_sn, 2},
}; };
static ExprBuiltinVar _builtin_vars[] = { static ExprBuiltinVar _builtin_vars[] = {