101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
#ifndef TOKENS_H
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#define TOKENS_H
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#include <math.h>
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#define printerr(format, ...) printf("error: " format "\n", ##__VA_ARGS__)
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/* ERROR MESSAGES */
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#define ZERODIV_ERR "zero divisor"
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#define DOMAIN_ERR "operand not in domain [%d, %d]"
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#define NEG_ERR "negative operand %g"
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/* --------- CALCULATOR FUNCTION TYPES */
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/* the following macros allow us to call native c constructs
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* in a declarative style */
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/* value */
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#define VALUE(ID) push(ID)
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/* command */
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#define COMMAND(CMD) CMD()
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/* commutative operator */
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#define COMM_OP(OP) push(pop() OP pop())
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/* non-commutative operator */
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#define NONC_OP(OP, ...) \
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do { double op = pop(); __VA_ARGS__ push(pop() OP op); } while (0)
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/* unary function */
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#define UNARY_FUN(F) push(F(pop()))
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/* unary function with tests */
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#define UNARY_T_FUN(F, ...) \
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do { double op = pop(); __VA_ARGS__ push(F(op)); } while (0)
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/* commutative function */
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#define COMM_FUN(F) push(F(pop(), pop()))
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/* non-commutative function */
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#define NONC_FUN(F, ...) \
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do { double op = pop(); __VA_ARGS__ push(F(pop(), op)); } while (0)
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/* OPERAND TESTS */
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/* nonzero operand */
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#define NONZ_SND_OP if (!op) printerr(ZERODIV_ERR); else
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/* operator in range */
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#define IN_RANGE(A, B) if (op < A || op > B) printerr(DOMAIN_ERR, A, B); else
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/* non-negative operand */
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#define NON_NEG if (op < 0) printerr(NEG_ERR, op); else
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/* --------- CALCULATOR FUNCTIONS */
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/* renaming macro */
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#define CALL(TOKEN, F, APPLY, ...) APPLY(F, ##__VA_ARGS__)
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#define COMMANDS \
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X(_, "last printed value", CALL, lst_print, VALUE) \
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X(ENTER, "pop top of stack and print it", CALL, print_pop, COMMAND) \
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X(print, "print top of stack", CALL, print_peek, COMMAND) \
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X(dup, "duplicate top of stack", COMMAND) \
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X(swap, "swap top two elements of stack", COMMAND) \
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X(clear, "clear stack", COMMAND) \
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X(help, "print all available commands", COMMAND) \
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X(vars, "print defined variables and their values", CALL, print_vars, COMMAND)
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#define MOD(x, y) ((int) (x) % (int) (y))
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#define OPERATORS \
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X(+, "add operands", COMM_OP) \
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X(*, "multiply operands", COMM_OP) \
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X(-, "substact operands", NONC_OP) \
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X(/, "divide operands", NONC_OP, NONZ_SND_OP) \
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X(%, "apply modulo to operands", CALL, MOD, NONC_FUN, NONZ_SND_OP) \
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X(>, "greater than", NONC_OP) \
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X(<, "less than", NONC_OP) \
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X(<=, "less than or equal", NONC_OP) \
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X(>=, "greater than or equal", NONC_OP) \
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X(==, "test equality", COMM_OP)
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#define MATH_H_BINDINGS \
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X(sin, "sine", UNARY_FUN) \
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X(cos, "cosine", UNARY_FUN) \
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X(tan, "tangent", UNARY_FUN) \
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X(acos, "arc cosine", UNARY_T_FUN, IN_RANGE(-1, 1)) \
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X(asin, "arc sine", UNARY_T_FUN, IN_RANGE(-1, 1)) \
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X(atan, "arc tangent", UNARY_FUN) \
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X(exp, "exponentional function", UNARY_FUN) \
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X(log, "natural logarithm", UNARY_T_FUN, NON_NEG) \
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X(log10, "logarithm of base 10", UNARY_T_FUN, NON_NEG) \
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X(log2, "logarithm of base 2", UNARY_T_FUN, NON_NEG) \
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X(pow, "power function", NONC_FUN) \
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X(sqrt, "square root", UNARY_T_FUN, NON_NEG) \
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X(ceil, "round up value", UNARY_FUN) \
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X(floor, "round down value", UNARY_FUN) \
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X(round, "round to nearest", UNARY_FUN) \
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X(abs, "absolute value", CALL, fabs, UNARY_FUN) \
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X(max, "maximum value", CALL, fmax, COMM_FUN) \
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X(min, "minimum value", CALL, fmin, COMM_FUN) \
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X(pi, "value of pi", CALL, M_PI, VALUE)
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#define TOKENS \
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COMMANDS \
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OPERATORS \
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MATH_H_BINDINGS
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#undef printerr
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#endif // TOKENS_H
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