The Book

Class: Mark

BNF~ Mark

Represents a mark in a rule.

new Mark(grammar, rule, position)

Creates a new mark for a rule; see factory method grammar.mark().

Parameters:
Name Type Description
grammar module:BNF~Grammar

supplies factory method.
rule module:BNF~Rule

rule to mark.
position number

position in rule, before a symbol or after all.
Properties:
Name Type Description
assert function

bound to grammar.assert().
mark function

bound to grammar.mark().
rule module:BNF~Rule

rule to mark.
position number

position in rule, before a symbol or after all.
complete boolean

true if position is after all symbols.
Source:

Methods

advance()

Advances the mark.

Source:
Returns:

a new configuration with the mark moved right, i.e., position increased by 1.

Type
module:BNF~Mark

equals(c)

Compares two marks.

Parameters:
Name Type Description
c module:BNF~Mark

to compare to this.
Source:
Returns:

true if same rule and same position.

toString()

Displays the marked rule.

Source:
Returns:
Type
string