Module:ParsePage

--[[

This module is a collection of functions to assist in extracting information from full Wikipedia pages.

It is not intended to be a full parser, or anything like that, merely a simple system for grabbing a few relevant details. These functions are not intended to be called directly from templates, but rather these functions would be included and referenced in other Lua modules that examine page text.

]]

p = {}

p.getUsers = function ( text, sort, unique ) sort = sort or false; unique = unique or false; local user_table = {}; local search_re, link; -- Note, mw.ustring.gmatch is relatively slow. Should switch to    -- string once the string.gmatch bug is resolved. if not sort then search_re = '%[%[User:([^/]-)[|%]#]'; for ind, name in string.gmatch( text, search_re ) do           link = table.concat( {, name, } ); table.insert( user_table, {ind, name, link} ); end search_re = '%[%[User talk:([^/]-)[|%]#]'; for ind, name in string.gmatch( text, search_re ) do           if string.match( name, '^%d-%.%d-%.%d-%.%d-$' ) or string.match( name, '^[%dA-F]-:[%dA-F]-:[%dA-F]-:[%dA-F]-:[%dA-F]-:[%dA-F]$' ) then link = table.concat( {, name, } ); table.insert( user_table, {ind, name, link} ); else link = table.concat( {, name, } ); table.insert( user_table, {ind, name, link} ); end end table.sort( user_table, p._comp1 ); else search_re = '%[%[User:([^/]-)[|%]#]'; for name in string.gmatch( text, search_re ) do           link = table.concat( {, name, } ); table.insert( user_table, {0, name, link} ); end search_re = '%[%[User talk:([^/]-)[|%]#]'; for name in string.gmatch( text, search_re ) do           if string.match( name, '^%d-%.%d-%.%d-%.%d-$' ) or string.match( name, '^[%dA-F]-:[%dA-F]-:[%dA-F]-:[%dA-F]-:[%dA-F]-:[%dA-F]$' ) then link = table.concat( {, name, } ); table.insert( user_table, {0, name, link} ); else link = table.concat( {, name, } ); table.insert( user_table, {0, name, link} ); end end local comp = function( a, b ) return a[2] < b[2]; end table.sort( user_table, comp ); end if unique then user_table = p._makeUniqueTable( user_table, 2, sort ); end

local name_table = {}; local last; for _, v in ipairs( user_table ) do       if v[2] ~= last then table.insert( name_table, {v[2], v[3]} ); end last = v[2]; end

return name_table; end

p.getSections = function( text, header_level ) local head_item = '^' .. string.rep( '=', header_level ) .. '[^=]';   local head_filter = table.concat( { '^',  string.rep( '=', header_level ),        '%s*(.*)%s*' .. string.rep( '=', header_level ) } ); local pos, last_pos, total_len; local new_table = {}; local line_group = {}; local headings = { '' }; for line in string.gmatch( text, "\n([^\n]*)" ) do       if string.match( line, head_item ) then table.insert( new_table, table.concat( line_group, "\n" ) ); table.insert( headings, mw.ustring.match( line, head_filter ) ); line_group = { line }; else table.insert( line_group, line ); end end table.insert( new_table, table.concat( line_group ) ); return new_table, headings; end

p.getTimestamps = function ( text ) local time_table = {}; local lang = mw.getContentLanguage; local val; -- 01:02, 28 February 2013 (UTC) for ts in string.gmatch( text, '%d%d:%d%d, %d%d? %w- %d%d%d%d %(UTC%)' ) do       val = tonumber( lang:formatDate( 'U', ts ) ); table.insert( time_table, {ts, val} ); end return time_table; end

p.formatSectionLink = function( root, text ) local frame = mw.getCurrentFrame; local link = text; link = string.gsub( link, '%b<>', '' ); link = string.gsub( link, '%[%[', '' ); link = string.gsub( link, '%]%]', '' ); return table.concat( { .. link ..  } ); end

p.formatDateDiff = function( date_diff ) if date_diff < 60*60 then return tonumber( math.floor(date_diff/6)/10 ) .. ' minutes'; elseif date_diff < 60*60*24 then return tonumber( math.floor(date_diff/(6*60))/10 ) .. ' hours'; else return tonumber( math.floor(date_diff/(6*60*24))/10 ) .. ' days'; end end

p.getExcerpt = function( text, length ) length = length or 200; text = '\n' .. text .. '\n'; text = string.gsub( text, '\n=+[^=]-=+', '\n' ); --headings text = string.gsub( text, '%%]', '' ); --files text = string.gsub( text, '%%]', '' ); --images text = mw.ustring.match( text, '%s*(%S.*%S)%s*' ); --trim text = string.gsub( text, '|', "&#124;" ); --table text = string.gsub( text, '%b<>', "" ); --tags text = string.gsub( text, '{', "&#123;" ); --tags text = string.gsub( text, '{', "&#125;" ); --tags if mw.ustring.len( text ) < length then return text; else return mw.ustring.sub( text, 1, length ) .. mw.ustring.match( text, '%S*', length+1 ) .. '...';   end end

function p._compKey( a, b, key ) return a[key] < b[key]; end

function p._comp1( a, b ) return p._compKey( a, b, 1 ); end

function p._makeUniqueTable( t, key, sort ) sort = sort or false; local comp; if key then comp = function( a, b ) return p._compKey( a, b, key ); end else comp = nil; end if sort then if comp then table.sort( t, comp ); else table.sort( t ); end local new_table, last; new_table = {}; last = ''

for k, v in ipairs( t ) do                       if key then if v[key] ~= last then table.insert( new_table, v ); last = v[key]; end else if v ~= last then table.insert( new_table, v ); last = v;               end end end return new_table; else local simple_table = {}; local new_table = {}; for _, item in ipairs( t ) do             if key then if not simple_table[item[key]] then table.insert( new_table, item ) end simple_table[item[key]] = true; else if not simple_table[item] then table.insert( new_table, item ) end simple_table[item] = true; end end return new_table; end end

return p;