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Diffstat (limited to 'lib/gitlab/ci/pipeline/expression/statement.rb')
-rw-r--r-- | lib/gitlab/ci/pipeline/expression/statement.rb | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/lib/gitlab/ci/pipeline/expression/statement.rb b/lib/gitlab/ci/pipeline/expression/statement.rb new file mode 100644 index 00000000000..4f0e101b730 --- /dev/null +++ b/lib/gitlab/ci/pipeline/expression/statement.rb @@ -0,0 +1,42 @@ +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 |