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Added closures. Refactoring.

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This commit is contained in:
Lewis Van Winkle
2016-02-24 22:26:54 -06:00
parent 4f35ab350d
commit b24086b376
3 changed files with 131 additions and 52 deletions
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129
tinyexpr.c
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@@ -28,24 +28,15 @@
#include <string.h>
#include <stdio.h>
typedef double (*te_fun0)(void);
typedef double (*te_fun1)(double);
typedef double (*te_fun2)(double, double);
typedef double (*te_fun3)(double, double, double);
typedef double (*te_fun4)(double, double, double, double);
typedef double (*te_fun5)(double, double, double, double, double);
typedef double (*te_fun6)(double, double, double, double, double, double);
typedef double (*te_fun7)(double, double, double, double, double, double, double);
enum {
TOK_NULL, TOK_ERROR, TOK_END, TOK_SEP,
TOK_OPEN, TOK_CLOSE, TOK_NUMBER, TOK_VARIABLE, TOK_INFIX,
TOK_FUNCTION0, TOK_FUNCTION1, TOK_FUNCTION2, TOK_FUNCTION3,
TOK_FUNCTION4, TOK_FUNCTION5, TOK_FUNCTION6, TOK_FUNCTION7
TOK_NULL = TE_CLOSURE7+1, TOK_ERROR, TOK_END, TOK_SEP,
TOK_OPEN, TOK_CLOSE, TOK_NUMBER, TOK_VARIABLE, TOK_INFIX
};
enum { TE_CONSTANT = TE_FUNCTION7+1};
enum {TE_CONSTANT = 1};
typedef struct state {
@@ -59,7 +50,11 @@ typedef struct state {
} state;
#define ARITY(TYPE) (((TYPE) < TE_FUNCTION0 || (TYPE) > TE_FUNCTION7) ? 0 : ((TYPE)-TE_FUNCTION0))
#define ARITY_CLO(TYPE) ( ((TYPE) >= TE_CLOSURE0 && (TYPE) <= TE_CLOSURE7) ? ((TYPE)-TE_CLOSURE0) : 0 )
#define ARITY(TYPE) ( ((TYPE) >= TE_FUNCTION0 && (TYPE) <= TE_FUNCTION7) ? ((TYPE)-TE_FUNCTION0) : ARITY_CLO(TYPE) )
#define NEW_EXPR(type, ...) new_expr((type), (const te_expr*[]){__VA_ARGS__})
static te_expr *new_expr(const int type, const te_expr *parameters[]) {
const int arity = ARITY(type);
@@ -77,13 +72,13 @@ static te_expr *new_expr(const int type, const te_expr *parameters[]) {
void te_free(te_expr *n) {
if (!n) return;
switch (n->type) {
case TE_FUNCTION7: te_free(n->parameters[6]);
case TE_FUNCTION6: te_free(n->parameters[5]);
case TE_FUNCTION5: te_free(n->parameters[4]);
case TE_FUNCTION4: te_free(n->parameters[3]);
case TE_FUNCTION3: te_free(n->parameters[2]);
case TE_FUNCTION2: te_free(n->parameters[1]);
case TE_FUNCTION1: te_free(n->parameters[0]);
case TE_FUNCTION7: case TE_CLOSURE7: te_free(n->parameters[6]);
case TE_FUNCTION6: case TE_CLOSURE6: te_free(n->parameters[5]);
case TE_FUNCTION5: case TE_CLOSURE5: te_free(n->parameters[4]);
case TE_FUNCTION4: case TE_CLOSURE4: te_free(n->parameters[3]);
case TE_FUNCTION3: case TE_CLOSURE3: te_free(n->parameters[2]);
case TE_FUNCTION2: case TE_CLOSURE2: te_free(n->parameters[1]);
case TE_FUNCTION1: case TE_CLOSURE1: te_free(n->parameters[0]);
}
free(n);
}
@@ -190,11 +185,16 @@ void next_token(state *s) {
{
case TE_VARIABLE:
s->type = TOK_VARIABLE;
s->bound = var->address; break;
s->bound = var->address;
break;
case TE_FUNCTION0: case TE_FUNCTION1: case TE_FUNCTION2: case TE_FUNCTION3:
case TE_FUNCTION4: case TE_FUNCTION5: case TE_FUNCTION6: case TE_FUNCTION7:
s->type = TOK_FUNCTION0 + ARITY(var->type);
case TE_CLOSURE0: case TE_CLOSURE1: case TE_CLOSURE2: case TE_CLOSURE3:
case TE_CLOSURE4: case TE_CLOSURE5: case TE_CLOSURE6: case TE_CLOSURE7:
s->type = var->type;
s->function = var->address;
break;
}
}
@@ -241,8 +241,9 @@ static te_expr *base(state *s) {
next_token(s);
break;
case TOK_FUNCTION0:
ret = new_expr(TE_FUNCTION0, 0);
case TE_FUNCTION0:
case TE_CLOSURE0:
ret = new_expr(s->type, 0);
ret->function = s->function;
next_token(s);
if (s->type == TOK_OPEN) {
@@ -255,18 +256,21 @@ static te_expr *base(state *s) {
}
break;
case TOK_FUNCTION1:
ret = new_expr(TE_FUNCTION1, 0);
case TE_FUNCTION1:
case TE_CLOSURE1:
ret = new_expr(s->type, 0);
ret->function = s->function;
next_token(s);
ret->parameters[0] = power(s);
break;
case TOK_FUNCTION2: case TOK_FUNCTION3: case TOK_FUNCTION4:
case TOK_FUNCTION5: case TOK_FUNCTION6: case TOK_FUNCTION7:
arity = s->type - TOK_FUNCTION0;
case TE_FUNCTION2: case TE_FUNCTION3: case TE_FUNCTION4:
case TE_FUNCTION5: case TE_FUNCTION6: case TE_FUNCTION7:
case TE_CLOSURE2: case TE_CLOSURE3: case TE_CLOSURE4:
case TE_CLOSURE5: case TE_CLOSURE6: case TE_CLOSURE7:
arity = ARITY(s->type);
ret = new_expr(TE_FUNCTION0 + arity, 0);
ret = new_expr(s->type, 0);
ret->function = s->function;
next_token(s);
@@ -281,7 +285,7 @@ static te_expr *base(state *s) {
break;
}
}
if(s->type != TOK_CLOSE || i < arity - 1) {
if(s->type != TOK_CLOSE || i != arity - 1) {
s->type = TOK_ERROR;
} else {
next_token(s);
@@ -324,7 +328,7 @@ static te_expr *power(state *s) {
if (sign == 1) {
ret = base(s);
} else {
ret = new_expr(TE_FUNCTION1, (const te_expr*[]){base(s)});
ret = NEW_EXPR(TE_FUNCTION1, base(s));
ret->function = negate;
}
@@ -339,7 +343,7 @@ static te_expr *factor(state *s) {
while (s->type == TOK_INFIX && (s->function == pow)) {
te_fun2 t = s->function;
next_token(s);
ret = new_expr(TE_FUNCTION2, (const te_expr*[]){ret, power(s)});
ret = NEW_EXPR(TE_FUNCTION2, ret, power(s));
ret->function = t;
}
@@ -354,7 +358,7 @@ static te_expr *term(state *s) {
while (s->type == TOK_INFIX && (s->function == mul || s->function == divide || s->function == fmod)) {
te_fun2 t = s->function;
next_token(s);
ret = new_expr(TE_FUNCTION2, (const te_expr*[]){ret, factor(s)});
ret = NEW_EXPR(TE_FUNCTION2, ret, factor(s));
ret->function = t;
}
@@ -369,7 +373,7 @@ static te_expr *expr(state *s) {
while (s->type == TOK_INFIX && (s->function == add || s->function == sub)) {
te_fun2 t = s->function;
next_token(s);
ret = new_expr(TE_FUNCTION2, (const te_expr*[]){ret, term(s)});
ret = NEW_EXPR(TE_FUNCTION2, ret, term(s));
ret->function = t;
}
@@ -383,7 +387,7 @@ static te_expr *list(state *s) {
while (s->type == TOK_SEP) {
next_token(s);
ret = new_expr(TE_FUNCTION2, (const te_expr*[]){ret, expr(s)});
ret = NEW_EXPR(TE_FUNCTION2, ret, expr(s));
ret->function = comma;
}
@@ -392,28 +396,53 @@ static te_expr *list(state *s) {
double te_eval(const te_expr *n) {
return te_eval_closure(n, 0);
}
double te_eval_closure(const te_expr *n, void *context) {
if (!n) return 0.0/0.0;
#define TE_FUN(...) ((double(*)(__VA_ARGS__))n->function)
#define M(e) te_eval(n->parameters[e])
switch(n->type) {
case TE_CONSTANT: return n->value;
case TE_VARIABLE: return *n->bound;
case TE_FUNCTION0: case TE_FUNCTION1: case TE_FUNCTION2: case TE_FUNCTION3:
case TE_FUNCTION4: case TE_FUNCTION5: case TE_FUNCTION6: case TE_FUNCTION7:
switch(ARITY(n->type)) {
#define m(e) te_eval(n->parameters[e])
case 0: return ((te_fun0)(n->function))();
case 1: return ((te_fun1)(n->function))(m(0));
case 2: return ((te_fun2)(n->function))(m(0), m(1));
case 3: return ((te_fun3)(n->function))(m(0), m(1), m(2));
case 4: return ((te_fun4)(n->function))(m(0), m(1), m(2), m(3));
case 5: return ((te_fun5)(n->function))(m(0), m(1), m(2), m(3), m(4));
case 6: return ((te_fun6)(n->function))(m(0), m(1), m(2), m(3), m(4), m(5));
case 7: return ((te_fun7)(n->function))(m(0), m(1), m(2), m(3), m(4), m(5), m(6));
default: return 0.0/0.0;
#undef m
}
switch(ARITY(n->type)) {
case 0: return TE_FUN(void)();
case 1: return TE_FUN(double)(M(0));
case 2: return TE_FUN(double, double)(M(0), M(1));
case 3: return TE_FUN(double, double, double)(M(0), M(1), M(2));
case 4: return TE_FUN(double, double, double, double)(M(0), M(1), M(2), M(3));
case 5: return TE_FUN(double, double, double, double, double)(M(0), M(1), M(2), M(3), M(4));
case 6: return TE_FUN(double, double, double, double, double, double)(M(0), M(1), M(2), M(3), M(4), M(5));
case 7: return TE_FUN(double, double, double, double, double, double, double)(M(0), M(1), M(2), M(3), M(4), M(5), M(6));
default: return 0.0/0.0;
}
case TE_CLOSURE0: case TE_CLOSURE1: case TE_CLOSURE2: case TE_CLOSURE3:
case TE_CLOSURE4: case TE_CLOSURE5: case TE_CLOSURE6: case TE_CLOSURE7:
switch(ARITY(n->type)) {
case 0: return TE_FUN(void*)(context);
case 1: return TE_FUN(void*, double)(context, M(0));
case 2: return TE_FUN(void*, double, double)(context, M(0), M(1));
case 3: return TE_FUN(void*, double, double, double)(context, M(0), M(1), M(2));
case 4: return TE_FUN(void*, double, double, double, double)(context, M(0), M(1), M(2), M(3));
case 5: return TE_FUN(void*, double, double, double, double, double)(context, M(0), M(1), M(2), M(3), M(4));
case 6: return TE_FUN(void*, double, double, double, double, double, double)(context, M(0), M(1), M(2), M(3), M(4), M(5));
case 7: return TE_FUN(void*, double, double, double, double, double, double, double)(context, M(0), M(1), M(2), M(3), M(4), M(5), M(6));
default: return 0.0/0.0;
}
default: return 0.0/0.0;
}
#undef TE_FUN
#undef M
}