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