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Contents
#
# ActiveFacts CQL Parser.
# Parse rules relating to Expressions
#
# Copyright (c) 2009 Clifford Heath. Read the LICENSE file.
#
module ActiveFacts
module CQL
grammar Expressions
rule expression
sum
end
rule sum
t0:product s tail:( op:add_op s t1:product s )*
{
def ast
if tail.elements.empty?
t0.ast
else
Compiler::Sum.new(t0.ast, *tail.elements.map{|e| e.op.text_value == '-' ? Compiler::Negate.new(e.t1.ast) : e.t1.ast})
end
end
}
end
rule add_op
'+' / '-'
end
rule product
f0:factor s tail:( op:mul_op s f1:factor s )*
{
def ast
if tail.elements.empty?
f0.ast
else
Compiler::Product.new(f0.ast, *tail.elements.map{|e| e.op.text_value != '*' ? Compiler::Reciprocal.new(e.op.text_value, e.f1.ast) : e.f1.ast})
end
end
}
end
rule factor
literal u:unit? s
{
def ast
Compiler::Literal.new(literal.value, u.empty? ? nil : u.text_value)
end
}
/ derived_variable
/ !context_note '(' s sum s ')' s { def ast; sum.ast; end }
end
rule derived_variable
derived:term s role_id:(role_name / subscript )?
{
def ast quantifier = nil, value_constraint = nil, literal = nil, nested_clauses = nil
role_name = role_id.empty? ? nil : role_id.value
derived.ast(quantifier, nil, role_name, value_constraint, literal, nested_clauses)
end
}
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems