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Contents
require_relative 'libbel'
require_relative 'completion_rule'
require_relative 'language'
require_relative 'namespace'
module BEL
module Completion
# Provides completions on BEL expressions.
#
# If +bel_expression+ is +nil+ then its assumed to be the empty string
# otherwise the +to_s+ method is called. An empty +bel_expression+ will
# return all BEL functions as possible completions.
#
# If +search+ is +nil+ then namespace values will not be provided as
# completion. +search+ is expected to implement {IdentifierSearch}.
#
# If +position+ is +nil+ then its assumed to be the last index of
# +bel_expression+ otherwise the +to_i+ method is called.
#
# If +position+ is negative or greater than the length of +bel_expression+
# an +IndexError+ is raised.
#
# @param bel_expression [responds to #to_s] the bel expression to
# complete on
# @param search [IdentifierSearch] the search object used to
# provide namespace value completions
# @param position [responds to #to_i] the position to complete from
# @return [Array<Completion>]
def self.complete(bel_expression, search = nil, position = nil)
bel_expression = (bel_expression || '').to_s
position = (position || bel_expression.length).to_i
if position < 0 or position > bel_expression.length
msg = %Q{position #{position}, bel_expression "#{bel_expression}"}
fail IndexError, msg
end
token_list = LibBEL::tokenize_term(bel_expression)
active_token, active_index = token_list.token_at(position)
# no active token indicates the position is out of
# range of all tokens in the list.
return [] unless active_token
tokens = token_list.to_a
options = {
:search => search
}
BEL::Completion::run_rules(tokens, active_index, active_token, options)
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems