org.openpdf.renderer.function.postscript.operation.Eq Maven / Gradle / Ivy
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package org.openpdf.renderer.function.postscript.operation;
import java.util.Stack;
final class Eq implements PostScriptOperation {
@Override
/**
* any1 any2 eq bool
*
* 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.
* Simple objects are equal if their types and values
* are the same. Strings are equal if their lengths and
* individual elements are equal.
* Other composite objects
* (arrays 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.
* This operator performs some type conversions.
* Integers and real numbers can be compared freely:
* an integer and a real number representing the same
* mathematical value are considered equal by eq.
* Strings and names can likewise be compared freely:
* a name defined by some sequence of characters is equal
* to a string whose elements are the same sequence of
* characters.
* The literal/executable and access attributes of
* objects are not considered in comparisons
* between objects.
*
* errors: invalidaccess, stackunderflow
*/
public void eval(Stack