Package slogo.instruction

Class Summary

Class	Description
Addition	Represents a + b, the addition of two expressions
ArithmeticInstruction	The base class of all arithmetic instruction, the evaluate method uses the hook/template method value to return a Double value, the template method returns a double.
Assignment	An assignment instruction assigns an expression to a variable, updating the global state to reflect the assignment.
Back
BinaryExpression	The base class of any binary expression, e.g., a + b, a - b, or, in future use, a < b and so on.
Clean	A Clean instruction has zero components: when called, it will clear the screen.
ClearScreen	A CS instruction has zero components: when called, it will clear the screen and return the turtle to its home coordinates.
Difference	A DIFFERENCE instruction has two components: two GrammarElements that represents the two numbers to perform subtraction on.
Division	Represents a / b, the division of two expressions
EqualBool	A REMAINDER instruction has two components: two GrammarElements that represents the two numbers to perform subtraction on.
Forward	A FORWARD instruction has one component: a GrammarElement that represents the number of steps to take in the forward direction.
Greater	A GREATER instruction has two components: a GrammarElement that represents the first double and a GrammarElement that represents the second double To evaluate a GREATER instruction the expressions are evaluated first, this determines then double version of the numbers.
Heading	A HEADING instruction has no components: when called, it will return the current heading of the turtle.
HideTurtle	A HIDETURTLE instruction has no components: when called, it will hide the turtle from the GUI view.
Home	A HOME instruction has no components: when called, it returns the Turtle back to its home coordinates.
If	An IF instruction has two components: (1) an expression representing the varOrComman and (2) a strict instruction list that is the list of instructions that will be executed.
Instruction	Represents an instruction in the SLogo language
Left	A LEFT instruction has one component: a GrammarElement that represents the number of degrees to turn the turtle to the left.
Less	A LESS instruction has two components: a GrammarElement that represents the first double and a GrammarElement that represents the second double To evaluate a LESS instruction the expressions are evaluated first, this determines then double version of the numbers.
Minus	A MINUS instruction has one component: a GrammarElement that represents the number to return the negative of.
Multiplication	Represents a x b, the multiplication of two expressions
Negation	Represents unary minus, e.g., MINUS num OR -expression
NotEqual	A NOTEQUAL instruction has two components: a GrammarElement that represents the first double and a GrammarElement that represents the second double To evaluate a NOTEQUAL instruction the expressions are evaluated first, this determines then double version of the numbers.
PenDown	A PENDOWN instruction has no components: when called, it puts the pen down, which gives the turtle drawing functionality.
PenDownP	A PENDOWNP instruction has no components: when called, it returns true or false, depending on whether the pen is up or down To evaluate a PENDOWNP instruction, the getPen method is called on the turtle.
PenUp	A PENUP instruction has no components: when called, it puts the pen up, which takes away the turtle's drawing functionality.
Print	The Print instruction prints an expression.
Product	A PRODUCT instruction has two components: two GrammarElements that represents the two numbers to perform multiplication on.
Quotient	A QUOTIENT instruction has two components: two GrammarElements that represents the two numbers to perform integer division on.
Remainder
Repeat	An AST (abstract syntax tree) for a SLogo REPEAT instruction.
Right	A RIGHT instruction has one component: a GrammarElement that represents the number of degrees to turn the turtle to the right.
SetX	A SETX instruction has one component: a GrammarElement that represents the x coordinate to set.
SetXY	A SETXY instruction has two components: two GrammarElements that represents the x and y coordinates to set.
SetY	A SETY instruction has one component: a GrammarElement that represents the y coordinate to set.
ShowTurtle	A SHOWTURTLE instruction has no components: when called, it will show the turtle from the GUI view.
StrictInstructionList	A list of instructions that doesn't include a function definition.
Subtraction	Represents a subtraction (e.g., lhs - rhs)
Sum	A SUM instruction has two components: two GrammarElements that represents the two numbers to perform addition on.
To
Towards	Calculates the direction turtle should be facing and returns this to
UnaryExpression	Represents a unary expression
Xcor	A XCOR instruction has no components: when called, it returns the x coordinate of the turtle's current position.
Ycor	A YCOR instruction has no components: when called, it returns the y coordinate of the turtle's current position.