Kryptostack
Operators Section Dissenting

Intentionally dissenting from the red book implementation.

This operators are entries in the systemdict dictionary.

add

Stack:
$ z\ z\ --\ z $

Addition without any type conversion between I and R.

Type Conversion:
None.

atan

Stack:
$ z_1\ z_2\ --\ R $

Red book arc tangent operator of $z_1/z_2$. But additionally honours the Context angular unit: RAD or DEG.
Throws undefinedresult if both $ z_1 $ and $ z_2 $ are 0.
The result interval is $ [0,2\pi [ $.

Type Conversion:
Implicit conversion from I to R for I parameters.
See also
__RAD __DEG

copy

Stack:
$ X_1\ ...\ X_I\ I\ --\ X_1\ ...\ X_I\ X_1\ ...\ X_I $

Copies duplicates of the top I stack objects onto the stack.
The operations on arrays, dictionaries, stacks and strings aren't implemented.

cos

Stack:
$ z\ --\ R $

Cosine.
Honours the Context angular unit: RAD or DEG.

Type Conversion:
Implicit conversion from I to R for I parameters.
See also
__RAD __DEG

cvi

Stack:
$ z\ --\ I $

Converts R to I by rounding towards 0. String operands are not implemented.

Type Conversion:
Explicit conversion from R to I.

cvr

Stack:
$ z\ --\ R $

Converts I to R. String operands are not implemented.

Type Conversion:
Explicit conversion from I to R.

eq

Stack:
$ X\ X\ --\ B $

Pops two objects from the operand stack and pushes true if they are
equal, or false if not. The definition of equality depends on the types
of the objects being compared.

  • Null objects and mark objects are always equal.
  • Simple objects are equal if their types and values are the same.
  • Strings are equal if their lengths and individual elements are equal.
  • Empty arrays are equal.
  • The composite objects arrays, stacks and dictionaries are equal
    only if they share the same value. Separate values are considered unequal,
    even if all the components of those values are the same.

The literal/executable attribute of objects is not considered in comparisons
between objects.

Type Conversion:
None.

exec

Stack:
$ a|n\ -- $

Executes the given procedure or the given executable name object.

ge

Stack:
$ I\ I\ --\ B $
$ R\ R\ --\ B $
$ S\ S\ --\ B $

Pops two objects from the operand stack and pushes true if
the first operand is greater than or equal to the second, or false otherwise.

Type Conversion:
None.

gt

Stack:
$ I\ I\ --\ B $
$ R\ R\ --\ B $
$ S\ S\ --\ B $

Pops two objects from the operand stack and pushes true if
the first operand is greater than the second, or false otherwise.

Type Conversion:
None.

le

Stack:
$ I\ I\ --\ B $
$ R\ R\ --\ B $
$ S\ S\ --\ B $

Pops two objects from the operand stack and pushes true if
the first operand is less than or equal to the second, or false otherwise.

Type Conversion:
None.

length

Stack:
$ X\ --\ I $

Returns the number of elements in the value of its operand if the operand is an array, stack or a string.
If the operand is a dictionary, length returns the current number of entries it contains.
If the operand is a name object, the length returned is the number of characters in the text string that defines it.
In all other cases length returns 1.

lt

Stack:
$ I\ I\ --\ B $
$ R\ R\ --\ B $
$ S\ S\ --\ B $

Pops two objects from the operand stack and pushes true if
the first operand is less than the second, or false otherwise.

Type Conversion:
None.

mod

Stack:
$ I_1\ I_2\ --\ I $

Similar to the red book operator. But implements the mathematical modulus of the integers.
$ I_2 > 0 $.

mul

Stack:
$ z\ z\ --\ z $

Multiplication without any type conversion between I and R.

Type Conversion:
None.

quit

Stack:
$ -- $

Stops the interpreter.

sin

Stack:
$ z\ --\ R $

Sine.
Honours the Context status angular unit: RAD or DEG.

Type Conversion:
implicit conversion from I to R for I parameters.
See also
__RAD __DEG

sub

Stack:
$ z\ z\ --\ z $

Subtraction without any type conversion between I and R.

Type Conversion:
None.

systemdict

Stack:
$ --\ D $

Pushes the systemdict on the operand stack.
It's a true operator to work around the self-referencing situation,
where systemdict contains itself as value systemdict.

bind

Stack:
$ A|a\ --\ A|a $

Replaces executable names with operator objects recursively into elements
that are arrays. true __compile enables more advanced optimization and complile
features of bind.

See also
__compile
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