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|
module Gitlab
module Ci
module Pipeline
module Expression
class Lexer
LEXEMES = [
Expression::Lexeme::Variable,
Expression::Lexeme::String,
Expression::Lexeme::Equals
].freeze
MAX_CYCLES = 5
SyntaxError = Class.new(StandardError)
def initialize(statement)
@scanner = StringScanner.new(statement)
@tokens = []
end
def tokens
return @tokens if @tokens.any?
MAX_CYCLES.times do
LEXEMES.each do |lexeme|
@scanner.skip(/\s+/) # ignore whitespace
lexeme.scan(@scanner).tap do |token|
@tokens.push(token) if token.present?
end
return @tokens if @scanner.eos?
end
end
raise Lexer::SyntaxError unless @scanner.eos?
end
def lexemes
tokens.map(&:to_lexeme)
end
end
end
end
end
end
|
