class Z80::ConditionalBlock

else(&block) click to toggle source

Evaluates a block in an anonymous namespace if the condition evaluates to false. Returns an instance of ConditionalBlock.

NOTE: The block should produce some code or raise an error without producing any code. Labels defined inside a block are not accessible from outside of the conditional block.

# File lib/z80/select.rb, line 44
def else(&block)
        raise Syntax, "Only one of `else' or `else_select` variant may be defined" unless @selection.else.nil?
        # create an empty +then+ variant that just passes.
        @selection.then = create_variant if @selection.then.nil?
        @selection.else = create_variant(&block)
        self
end

else_select(*args, &test) click to toggle source

Evaluates additional condition if the previous condition evaluates to false. Returns an instance of ConditionalBlock.

See Program.select.

# File lib/z80/select.rb, line 57
def else_select(*args, &test)
        raise Syntax, "Only one of `else' or `else_select` variant may be defined" unless @selection.else.nil?
        # create an empty +then+ variant that just passes.
        @selection.then = create_variant if @selection.then.nil?
        ConditionalBlock.new(@program, *args, address: @address, codesize: @codesize, &test).tap do |cond|
                @selection.else = cond.selection
        end
end

then(&block) click to toggle source

Evaluates a block in an anonymous namespace if the condition evaluates to true. Returns an instance of ConditionalBlock.

NOTE: The block should produce some code or raise an error without producing any code. Labels defined inside a block are not accessible from outside of the conditional block.

# File lib/z80/select.rb, line 32
def then(&block)
        raise Syntax, "`then' variant may be defined only once" unless @selection.then.nil?
        @selection.then = create_variant(&block)
        self
end