Module:OsmPageTitleParser

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This module parses title object into language, key value, and an optional tag value. This module is designed to be used by other modules. See also testcases code.

2 tests failed.

test_keyprefixes_en

	Text	Expected	Actual
N	Key:something:*	{key="something:",language="en"}	{language="en",key="something:*"}

test_keys_en

	Text	Expected	Actual
Y	Key:something	{key="something",language="en"}	{language="en",key="something"}
Y	Key:some thing	{key="some_thing",language="en"}	{language="en",key="some_thing"}
Y	Key:some_thing	{key="some_thing",language="en"}	{language="en",key="some_thing"}
Y	Key:some:thing	{key="some:thing",language="en"}	{language="en",key="some:thing"}
Y	KEY::some:thing	{key=":some:thing",language="en"}	{language="en",key=":some:thing"}
Y	Key:some:thing:aa	{key="some:thing:aa",language="en"}	{language="en",key="some:thing:aa"}
Y	Key:some:thing:aa:	{key="some:thing:aa:",language="en"}	{language="en",key="some:thing:aa:"}

test_keys_international

	Text	Expected	Actual
Y	ko:key:some:thing	{key="some:thing",language="ko"}	{language="ko",key="some:thing"}
Y	kO:key:some:thing:o	{key="some:thing:o",language="ko"}	{language="ko",key="some:thing:o"}
Y	kO:key:so me:thing:o:	{key="so_me:thing:o:",language="ko"}	{language="ko",key="so_me:thing:o:"}
Y	No:key:abc	{key="abc",language="no"}	{language="no",key="abc"}

test_keys_international_known_NS

	Text	Expected	Actual
Y	ru:Key:something	{key="something",language="ru"}	{language="ru",key="something"}
Y	rU:KEY:some:thing:o	{key="some:thing:o",language="ru"}	{language="ru",key="some:thing:o"}
Y	rU:keY:so me:thing:o:	{key="so_me:thing:o:",language="ru"}	{language="ru",key="so_me:thing:o:"}

test_langPrefix

	Text	Expected	Actual
Y	en
Y	EN
Y	fr	FR:	FR:
Y	Fr	FR:	FR:
Y	PT	Pt:	Pt:
Y
Y	(nil)

test_language_pseudonamespaces

	Text	Expected	Actual
Y	bh:Main	{language="bh",_parseFailed=true}	{language="bh",_parseFailed=true}
Y	ca-valencia:Main	{language="ca-valencia",_parseFailed=true}	{language="ca-valencia",_parseFailed=true}
Y	gcf:Main	{language="gcf",_parseFailed=true}	{language="gcf",_parseFailed=true}
Y	gsw:Main	{language="gsw",_parseFailed=true}	{language="gsw",_parseFailed=true}
Y	kbp:Main	{language="kbp",_parseFailed=true}	{language="kbp",_parseFailed=true}
Y	kfa:Main	{language="kfa",_parseFailed=true}	{language="kfa",_parseFailed=true}
Y	mrw:Main	{language="mrw",_parseFailed=true}	{language="mrw",_parseFailed=true}
Y	rcf:Main	{language="rcf",_parseFailed=true}	{language="rcf",_parseFailed=true}
Y	sr-cyrl:Main	{language="sr-cyrl",_parseFailed=true}	{language="sr-cyrl",_parseFailed=true}
Y	sr-latn:Main	{language="sr-latn",_parseFailed=true}	{language="sr-latn",_parseFailed=true}
Y	sxu:Main	{language="sxu",_parseFailed=true}	{language="sxu",_parseFailed=true}
Y	swg:Main	{language="swg",_parseFailed=true}	{language="swg",_parseFailed=true}
Y	sxu:Main	{language="sxu",_parseFailed=true}	{language="sxu",_parseFailed=true}
Y	trp:Main	{language="trp",_parseFailed=true}	{language="trp",_parseFailed=true}
Y	tzm:Main	{language="tzm",_parseFailed=true}	{language="tzm",_parseFailed=true}
Y	zgh:Main	{language="zgh",_parseFailed=true}	{language="zgh",_parseFailed=true}
Y	Nds:Main	{language="nds",_parseFailed=true}	{language="nds",_parseFailed=true}
Y	Gcf:Test	{language="gcf",_parseFailed=true}	{language="gcf",_parseFailed=true}
Y	Zh-hant:Relation	{language="zh-hant",_parseFailed=true}	{language="zh-hant",_parseFailed=true}
Y	Pt-br:Main	{language="pt-br",_parseFailed=true}	{language="pt-br",_parseFailed=true}
Y	No:Main	{language="no",_parseFailed=true}	{language="no",_parseFailed=true}

test_non_language_pseudonamespaces

	Text	Expected	Actual
Y	POI:Scotiabank	{language="en",_parseFailed=true}	{language="en",_parseFailed=true}
Y	Switzerland:Berne	{language="en",_parseFailed=true}	{language="en",_parseFailed=true}

test_splitKeyValue

	Text	Expected	Actual
Y	akey=avalue	{k="akey",v="avalue"}	{k="akey",v="avalue"}
Y	akey	{k="akey"}	{k="akey"}
Y	akey=	{k="akey",v=""}	{k="akey",v=""}
Y	akey=ava=lue	{k="akey",v="ava=lue"}	{k="akey",v="ava=lue"}
Y	akey==ava=lue=	{k="akey",v="=ava=lue="}	{k="akey",v="=ava=lue="}
Y		{k=""}	{k=""}
Y	(nil)	{}	{}

test_tags_en

	Text	Expected	Actual
Y	Tag:something=abc	{value="abc",key="something",language="en"}	{value="abc",key="something",language="en"}
Y	Tag:some:thing=abc:xyz	{value="abc:xyz",key="some:thing",language="en"}	{value="abc:xyz",key="some:thing",language="en"}
Y	TAG::some:thing=aa=bb=c	{value="aa=bb=c",key=":some:thing",language="en"}	{value="aa=bb=c",key=":some:thing",language="en"}
Y	taG:some:thing:aa bb=yy	{value="yy",key="some:thing:aa_bb",language="en"}	{value="yy",key="some:thing:aa_bb",language="en"}
Y	Tag:some:thing:aa:=a b	{value="a_b",key="some:thing:aa:",language="en"}	{value="a_b",key="some:thing:aa:",language="en"}

test_tags_international

	Text	Expected	Actual
Y	ko:key:some:thing=abc x:yz	{value="abc_x:yz",key="some:thing",language="ko"}	{value="abc_x:yz",key="some:thing",language="ko"}
Y	kO:key:some:thing:o=:a:	{value=":a:",key="some:thing:o",language="ko"}	{value=":a:",key="some:thing:o",language="ko"}
Y	kO:key:so me:thing:o:=*	{value="*",key="so_me:thing:o:",language="ko"}	{value="*",key="so_me:thing:o:",language="ko"}

test_tags_international_known_NS

	Text	Expected	Actual
Y	ru:Key:something=abc	{value="abc",key="something",language="ru"}	{value="abc",key="something",language="ru"}
Y	rU:KEY:some:thing:o=a=b:c	{value="a=b:c",key="some:thing:o",language="ru"}	{value="a=b:c",key="some:thing:o",language="ru"}
Y	rU:keY:so me:thing:o:===	{value="==",key="so_me:thing:o:",language="ru"}	{value="==",key="so_me:thing:o:",language="ru"}
Y	RU:Moscow	{language="ru",_parseFailed=true}	{language="ru",_parseFailed=true}

test_talkpages

	Text	Expected	Actual
Y	Talk:Main	{language="en",_parseFailed=true}	{language="en",_parseFailed=true}
Y	Talk:Pt:Creating an Account	{language="pt",_parseFailed=true}	{language="pt",_parseFailed=true}
N	Talk:Tag:phone=tag	{value="tag",key="phone",language="en",_parseFailed=true}	{value="tag",key="phone",language="en"}
Y	JA talk:Bus routes in Kanagawa	{language="ja",_parseFailed=true}	{language="ja",_parseFailed=true}
Y	Talk:POI:The Church of Jesus Christ of Latter-day Saints	{language="en",_parseFailed=true}	{language="en",_parseFailed=true}

test_unparsable_titles

	Text	Expected	Actual
Y	something	{language="en",_parseFailed=true}	{language="en",_parseFailed=true}
Y	FR:something	{language="fr",_parseFailed=true}	{language="fr",_parseFailed=true}
Y	ko:something	{language="ko",_parseFailed=true}	{language="ko",_parseFailed=true}
Y	some:thing	{language="en",_parseFailed=true}	{language="en",_parseFailed=true}
Y	FR:some:thing	{language="fr",_parseFailed=true}	{language="fr",_parseFailed=true}
Y	KO:some:thing	{language="ko",_parseFailed=true}	{language="ko",_parseFailed=true}
Y		{_parseFailed=true}	{_parseFailed=true}

local p = {}
local data = mw.loadData('Module:OSM Constants')

-- Module_talk:OsmPageTitleParser/testcases  has many test cases showing how to use this module
-- Simple debugging:
--  =p.parseTitle(mw.title.new('Key:test')).key

-- A wrapper to return the parse results. See p.parseTitleToObj
function p.parseTitle(title)
  local result = {}
  p.parseTitleToObj(result, title)
  return result
end

-- given a title string in a form of (lang-code:)?(tag|key):(tagkey)(=tagvalue)?
-- tries to parse it into language (object), key, and optional value strings
-- We have to do it manually because Lua regex support is not that great
-- The actual tag and key prefixes are ignored. Value will be nil if no equal sign.
-- The output result object will always get the language unless title is nil,
-- but no other values will be set unless successfuly parsed
-- Params:  title object,  result table to get the results
-- Returns true if parsed, false otherwise
function p.parseTitleToObj(result, title)
  if not title then return false end

  local language, prefix, tagkey, tagvalue

  -- if this is one of the known language namespaces, do not allow more language codes
  local ns = title.namespace / 2 * 2
  ns = ns - ns % 2 -- treat talk pages as their corresponding main pages
  local langCode = data.nsToLangCodeMap[ns]
  if langCode then
    language = mw.getLanguage(langCode)
  end

  local canonicalTitle = mw.ustring.gsub(title.text, ' ', '_')
  local keyvalue
  for _, val in ipairs(mw.text.split(canonicalTitle, ':', true)) do
    if not prefix then
      -- this could be the language code or the prefix (tag or key)
      local lval = string.lower(val)
      if lval == 'tag' or lval == 'key' then
        prefix = lval
      elseif not language and (data.customLangCodes[lval] or mw.language.isSupportedLanguage(lval)) then
      	-- mw.getLanguage will creat an object even if the language is not supported
        language = mw.getLanguage(lval)
      else
        -- unrecognized, there was no tag or key as first or second part
        break
      end
    else
      -- combine the values back into a single string after we found the prefix
      if keyvalue then
        keyvalue = keyvalue .. ':' .. val
      else
        keyvalue = val
      end
    end
  end

  if keyvalue then
    -- now split the keyvalue into key and (optional) value
    tagkey, tagvalue = p.splitKeyValue(keyvalue)
    if not tagkey and not tagvalue then
      keyvalue = nil
    end
  end

  if not language then
    result.language = mw.language.getContentLanguage()
  else
    result.language = language
  end

  if keyvalue then
    result.key = tagkey
    if tagvalue then result.value = tagvalue end
    return true
  else
    return false
  end
end

-- given a key=value string, split it into two parts and return both
-- if there is no equal sign, return key and nil value
function p.splitKeyValue(keyvalue)
	if not keyvalue then return end
	local tagkey, tagvalue
    local eqlSignPos = mw.ustring.find(keyvalue, '=', 1, true)
    if not eqlSignPos then
      tagkey = keyvalue
    else
      local keyvalLen = mw.ustring.len(keyvalue)
      if eqlSignPos > 1 then
        tagkey = mw.ustring.sub(keyvalue, 1, eqlSignPos - 1)
        tagvalue = mw.ustring.sub(keyvalue, eqlSignPos + 1)
      end
    end
    return tagkey, tagvalue
end

-- Given a language code, returns proper title prefix:
-- empty string for English, all caps for the namespaces, first letter cap for rest
function p.langPrefix(langCode)
	langCode = langCode and mw.ustring.lower(langCode) or ''
	if not langCode or langCode == '' or langCode == 'en' then
		return ''
	end
	for _,v in pairs(data.nsToLangCodeMap) do
	  if v == langCode then
	    return string.upper(langCode) .. ':'
	  end
	end
	return mw.getContentLanguage():ucfirst(langCode) .. ':'
end

function p.languageCodeInTitle(frame)
	local title = mw.title.new(frame.args[1])
	local language = p.parseTitle(title).language
	return language.code
end

function p.keyInTitle(frame)
	local title = mw.title.new(frame.args[1])
	return p.parseTitle(title).key
end

function p.valueInTitle(frame)
	local title = mw.title.new(frame.args[1])
	return p.parseTitle(title).value
end

function p.dataItemLabelFromTitle(frame)
	local title = mw.title.new(frame.args[1])
	local parsedTitle = p.parseTitle(title)
	if parsedTitle.value then
		return parsedTitle.key .. "=" .. parsedTitle.value
	end
	return parsedTitle.key
end

return p