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module Gitlab
module Ci
module Pipeline
module Expression
class Statement
StatementError = Class.new(StandardError)
GRAMMAR = [
%w[variable equals string],
%w[variable equals variable],
%w[variable equals null],
%w[string equals variable],
%w[null equals variable],
%w[variable]
].freeze
def initialize(statement, pipeline)
@lexer = Expression::Lexer.new(statement)
@variables = pipeline.variables.map do |variable|
[variable.key, variable.value]
end
end
def parse_tree
raise StatementError if @lexer.lexemes.empty?
unless GRAMMAR.find { |syntax| syntax == @lexer.lexemes }
raise StatementError, 'Unknown pipeline expression!'
end
Expression::Parser.new(@lexer.tokens).tree
end
def evaluate
parse_tree.evaluate(@variables.to_h)
end
end
end
end
end
end
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