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# frozen_string_literal: true
module JMESPath
# @api private
class TokenStream
# @param [String<JMESPath>] expression
# @param [Array<Token>] tokens
def initialize(expression, tokens)
@expression = expression
@tokens = tokens
@token = nil
@position = -1
self.next
end
# @return [String<JMESPath>]
attr_reader :expression
# @return [Token]
attr_reader :token
# @return [Integer]
attr_reader :position
# @option options [Array<Symbol>] :match Requires the next token to be
# one of the given symbols or an error is raised.
def next(options = {})
validate_match(_next, options[:match])
end
def lookahead(count)
@tokens[@position + count] || Token::NULL_TOKEN
end
# @api private
def inspect
str = []
@tokens.each do |token|
str << '%3d %-15s %s' %
[token.position, token.type, token.value.inspect]
end
str.join("\n")
end
private
def _next
@position += 1
@token = @tokens[@position] || Token::NULL_TOKEN
end
def validate_match(token, match)
if match && !match.include?(token.type)
raise Errors::SyntaxError, 'type missmatch'
else
token
end
end
end
end
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