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# -*- encoding: utf-8 -*-
require "unicode_utils/cased_char_q"
require "unicode_utils/case_ignorable_char_q"
require "unicode_utils/soft_dotted_char_q"
require "unicode_utils/combining_class"
require "unicode_utils/read_cdata"
module UnicodeUtils
module Impl # :nodoc:all
LANGS_WITH_RULES = {:tr => true, :lt => true, :az => true}
class ConditionalCasing
attr_reader :mapping
def initialize(mapping)
@mapping = mapping
end
def context_match?(str, pos)
true
end
end
class BeforeDotConditionalCasing < ConditionalCasing
def context_match?(str, pos)
(pos + 1).upto(str.length - 1) { |i|
c = str[i]
return true if c.ord == 0x0307
cc = UnicodeUtils.combining_class(c)
return false if cc == 0 || cc == 230
}
false # "combining dot above" not found
end
end
class NotBeforeDotConditionalCasing < BeforeDotConditionalCasing
def context_match?(str, pos)
!super
end
end
class MoreAboveConditionalCasing < ConditionalCasing
def context_match?(str, pos)
(pos + 1).upto(str.length - 1) { |i|
c = str[i]
cc = UnicodeUtils.combining_class(c)
return true if cc == 230
return false if cc == 0
}
false
end
end
class AfterIConditionalCasing < ConditionalCasing
def context_match?(str, pos)
(pos - 1).downto(0) { |i|
c = str[i]
return true if c.ord == 0x49 # uppercase I
cc = UnicodeUtils.combining_class(c)
return false if cc == 0 || cc == 230
}
false # uppercase I not found
end
end
class AfterSoftDottedConditionalCasing < ConditionalCasing
def context_match?(str, pos)
(pos - 1).downto(0) { |i|
c = str[i]
return true if UnicodeUtils.soft_dotted_char?(c)
cc = UnicodeUtils.combining_class(c)
return false if cc == 0 || cc == 230
}
false
end
end
class FinalSigmaConditionalCasing < ConditionalCasing
def context_match?(str, pos)
before_match?(str, pos) && !after_match?(str, pos)
end
private
def before_match?(str, pos)
(pos - 1).downto(0) { |i|
c = str[i]
return true if UnicodeUtils.cased_char?(c)
return false unless UnicodeUtils.case_ignorable_char?(c)
}
false # no cased char
end
def after_match?(str, pos)
(pos + 1).upto(str.length - 1) { |i|
c = str[i]
return true if UnicodeUtils.cased_char?(c)
return false unless UnicodeUtils.case_ignorable_char?(c)
}
false
end
end
CONDITIONAL_UPCASE_MAP =
read_conditional_casings("cond_uc_map")
CONDITIONAL_DOWNCASE_MAP =
read_conditional_casings("cond_lc_map")
CONDITIONAL_TITLECASE_MAP =
read_conditional_casings("cond_tc_map")
def self.conditional_upcase_mapping(cp, str, pos, language_id)
lang_map = CONDITIONAL_UPCASE_MAP[cp]
if lang_map
casing = lang_map[language_id] || lang_map[nil]
if casing && casing.context_match?(str, pos)
casing.mapping
end
end
end
def self.conditional_downcase_mapping(cp, str, pos, language_id)
lang_map = CONDITIONAL_DOWNCASE_MAP[cp]
if lang_map
casing = lang_map[language_id] || lang_map[nil]
if casing && casing.context_match?(str, pos)
casing.mapping
end
end
end
def self.conditional_titlecase_mapping(cp, str, pos, language_id)
lang_map = CONDITIONAL_TITLECASE_MAP[cp]
if lang_map
casing = lang_map[language_id] || lang_map[nil]
if casing && casing.context_match?(str, pos)
casing.mapping
end
end
end
end
end
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