debian-mirror-gitlab/lib/gitlab/ci/pipeline/expression/statement.rb

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# frozen_string_literal: true
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module Gitlab
module Ci
module Pipeline
module Expression
class Statement
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StatementError = Class.new(Expression::ExpressionError)
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GRAMMAR = [
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# presence matchers
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%w[variable],
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# positive matchers
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%w[variable equals string],
%w[variable equals variable],
%w[variable equals null],
%w[string equals variable],
%w[null equals variable],
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%w[variable matches pattern],
# negative matchers
%w[variable notequals string],
%w[variable notequals variable],
%w[variable notequals null],
%w[string notequals variable],
%w[null notequals variable],
%w[variable notmatches pattern]
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].freeze
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def initialize(statement, variables = {})
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@lexer = Expression::Lexer.new(statement)
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@variables = variables.with_indifferent_access
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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
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def truthful?
evaluate.present?
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rescue Expression::ExpressionError
false
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end
def valid?
parse_tree.is_a?(Lexeme::Base)
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rescue Expression::ExpressionError
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false
end
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end
end
end
end
end