ÿØÿà JFIF 

  
 
  ÿÛ „ 
 !.%+&8&+/1555$;@;4?.451
4,$,44444444444414444444444444444444444444444444444444ÿÀ  á á
" 

ÿÄ   



           
 ÿÄ ? 
    
 !1AQaq"2‘¡±ÁðBRbrÑá#‚’¢²3S CñÿÄ 
 

             
ÿÄ ! 
 
 
       
!1QAa‘2ÿÚ 
  ? 5˜Z¯V¦cø)›t/? z¨±>Õ5€¶‹Á¤·¼z¼Ü¬+ñ®v¤¨_ˆR­BFn©—˜ý®ç̝P8gýt·ÉSTŦˆìät?þé¼íìN/Þa)ì–í6ô…
Ï¿øÃj´¿KÇü]ÿ ªô¹-eKànëÕHTx}ýSÜ›ÿ ”7Ø×&µ<¦  ¥ÑO¶[Ù¯ä¨ÞÃÿ PZ-¬;#õ|•
oaÿ ©CìÞz3˜öː/¤­ñTûIØ}š^   mÓ%ªxˆ¥ÉŸu=Z+ISe¿45™¼u;ú&WØ÷€æßQ™®{|
íx*TC“#ZŠìZ§²‹ 6pv…³¿¡äª*áZÐ%ÒOáˆo"x«OHk
w±æ+¬V(kMúŸ5Vö«$ ÁrÏbàb57/luR ¸ÑÛj Òµì`Ðœq­û žICÀ
Ê•©4€Âcà¨Ï€O´<èÐ:›ù(Ë^L8þ‘ÍÌ#¸Ð_Ì©ÙK(Öz 4¬û+¸;ü’V’84‘¬ÃŽ:[â‡ÔÌáõp¢~§ªlæ£ö{®G>J¼"°‡7¯ÆÉèßû ‹É‹§ÁòÃýâßî
^ƾÙõ‹×óH#«LP½ïX=xÑÍ$|W?•~•îëÔ©ª‹
{ÝT…Kÿ ”hûâá)J*ö˜–ÔU;iÇ€/ ÆþjóZ\ýwØ=Ìm
ºèËL9 ýè
Æð/¨’¥öo=nË.%Îì   ŽÕ¯È|{Oj²ƒE6e/ßdÄõ²Ìâ1O®ò×TsəԸhOMýíMˆ¿¼H˜l²,7Â¥#MF/Úf°Ö½± ¸–dr‹NýÊ íjqx{œÉ ä-È    ¦
øÄër¨q°ð
†nцýÑÄÆ’mä…n<0È™;ÁÝá¯ÁZƒ7FÀmì­ É&9ˆîéi¶ùN§Y•ÃZãAâ?•‡©‰ , ó¾IŸŠc1 4â&y­&pŠ­6;M À 0¹qç»p.á …ŸÅáK@<u %Ü6ÓtIÌpÓr»söfeÁ0O…­´Kƒ&ñ™\©<+,~)‹
ºHÐ*×µ&†ž‘Æ÷ÚŸ
1ßjC5Oh´‡›

Ø×ë æâ“Þà

ÒT]§n{ºöB³ ¦ ̹Â8Êï¦MÉ<„¨s¹¶ì7Ì”æR$Ncà! /éþäRM÷Gƒ¿É$
¦oà>%6·y6ƒ‰3?”úºŽ‰éX5ªPT §µ!=Mž«Ú½‹ÅgÂSâÉaþÓoö–¯ÁÔìR>5éÿ üs¶ÆUcÌ  kÇR
]ÿ ù¬¼«VŽ;Â|‡~¢¦”ÏÅ°æ
{L™Õ°Óv¹ò¸írŽ¡×¢CÃ!íVÕ {¶»sŒNPg/
"uÕbkm²“$ďå¿é¹§°½æz¯6 †s¿!s–wÚÝ“™Œ°.ûj>·+™Òa…©Œ&rÝÎtÛë긪Ît’LAVp%c Úý[ÄzJ¾ÇàXXç@˜ó<êL]·T˜¾¥1Ó©V‡g´æ½¦Ý@¹óø!_@´ÞâSÁ —S3™•& ]@JHÚý©ZŽ €×æÔr»Áf!‡yÞ4Mv*èÓã_{‘åóUuљØ«Oïé*®EvÑ
Œ÷‡U \"㪒ÍK+À 4“M¡ï:0¥5í!'<@î´”>Ç»&Z–ïCCV˜Ì5Šo&îhè.žû
|ÓK©h$s6KìŒëã)¹hI¦GïOåóI;ììü#É$Š0…Ææ¥TØ.5­¾gn´ “ÂÖ\:hœ89G)J@„}œ:’Ò{/Š"¦_Æ×7Æ3VÇŠÊa]ÚŒÙ€Ä–=®uÁßâACZƒ§§£Qnâ:«,×{tyø¬iÛcœÜÄ€H½ÄÍCk´÷šß
.W'b¤Íåh]÷€=,Žv×cÚEÚHXJX¶îo¨FÒtèöŸ>ªª6[J®Fµ£sGÁeqõfe\íjÒÐïÄÐGˆe1Ø‹.Ø”‘Ëuø
Y­ˆÜŽG|zùªüMpDnQWÄ”%JŠ™)â*p@Örš«ÕT2Ð%ˆG#ª„
·¤!°ŸOTÂT¸aÚ%4&h™LµšØüÐ.F¿²ÐÞ_Ç‚¾ÅÃaÜ÷09Æ 
q€öy˜v‡85õN÷]¬äѼóS{°_MŽ¬úÔ#°Ç¸0åÞè2ëôPcvÆw9®ií1Ä8F™˜à‰´+‰Ik1òÝ7“Ñ×ÒsÝ\x‚h`ÞÑ`ó"|µEcý£n˜h`}GÞ  !±ù²Ápü²
ß6
0ïi󜵩SÈÇ7˜-ÕURO˜¦´f$ªž-Í6(œ}<„ éc øs]ŽŽ„*—¾
ìdŽ„)méª\¿êÎIg¾ØÞ~I#C/¼¼´EÁÈŽi8“©õådô·>euä ƒ'Ê×लR1ÉJE1ÐAát`t;ÇР%Ý<‡¥„ÍÆ`×Oyó)õiI€ñQaŸ4Ûù\áàaÃÔ¹HÃu¹*k€¦<„eS‡&õÏ
B!ŽhüÞ`yj}mªf×\¿
Ç~æ­9‡û\՞Ǖg²1Žû5V7 !àöšm°
c`ܬøÇìµÒ'P"?…´Ö,"§^•õŽ¨sÔ)6˜sæéÍR¼
ò|Sl”‹7 nPW

Gòú÷½§O¯‡„l¡kSÞŒr½PÊ@æ¢pŽ-mÿ #Ÿ˜Àº¶Áä¦;ïÔæ$1££`“Õ>„—·ž)ß
ð
³ñ#Ï Ô$¶œ‰ÊE‹À;÷º
¯«P:Ñ”8–IÊtpÞ3ª“>ê“þës4ò2OÏÕ­±zô†Õ§‰.÷ä¸;¿˜“'œ›žª}«Œ{ª±Ì 9ÔóÞÕ‡0
$íWV3Üì¬
—@kÝ4@¿r¼±½¬™›?øØæ´'Áé®CË3-g$˜ö‡×auÚi´Žp/êÛæF›Ú2v‹ã¿¿,nB1̨ƃqÞa5͝@&Æû“él÷ \C²½UÍc ¯k×¢U
ÖéQå™—-r    wô ÞÏ<Ò=&=ÿ Ôê Òêˈt,i—;LîÜ á¸*ÚÃ1$êL•LÍ <É)ýÐà’
;F™{ƒ™˜€&'}‚ãÄK`¡ÞT@I;®žZóè‚s’7®°›+§O­Åq©é»²9<Ô
J ¼9O’HL»Ùïì¸rk¼Ž_ý‘TŸu[²ßÚŒ·ü÷B%¯E ŸÔX5êO´Ç•€’I0 É<mÆÈJoúáõóQâØòÙaÙt:  ·=|Ôaz]a1cÉŸ1
4˜à3΍}GFøí7/B«vεŕL=Ðr1ÕšnwH›óÞ¢ºö{)´4€æZç^ÿ yÑ:_([¿ipqQÊ^âÆe;»½“¦º|¢ÀTçèrú1”óTÃ’u¦CG¤ ¡
Š­7ë

·i“¿z»n
ö¼±ù^ö<‹çu7¸ÈlvZðÛAUXje•
dLÞH ÚosÇr`È™‡pÊeÇ4@x7´)ö†Ótœ~i‘Ï[x@äUÃæ­m·e´x
°t¸·²5'žªža   =ÖÌåzϘ'-´ˆpž3§ò‡k  Ý'‰ýÑï¦3ºdè“{eiÔõNkîšECEΠ¥ÃT9ãqÃâŸîɐ8z \?€    >JX` 
ñ¹õ%;µŸD‘«´€àwÒ™UûئžÖö\×®×´8 ½‡ºÐÆÓ§?Àkmœ=;d5*@-ì0F Rªýš[Ü6âö̃ڸr*KA9· u*µæ£?U¸Âêí†8@¦X4 e-ò„0s{ HâUpU?¼mñRa°®a%Ð'tÉ×’\¾ÊÉ]t›h>·(Ë@R¼¡Ãt h}’O÷au<+nT…Ö…MӐ??Óe95 q>í/;&JSû °¯ÊéÞøƒ*Ã2½Ài&:nôUl=¾¿5eˆ3”ñc|Ú2V”>„»&eE;«ÚäC
p¢Ûúy 9š[ŒÌx¼擼A&DåÒ¯ˆ¤ÀÌ;"˜ÏQä¸åhÊ}Ûq«Û0WžÒ|»€ø®öCm5•\ÇÀ§Pe3£]0ÃàLDÉ‰1øªxjgwT‚÷¿LΨK‹›ùs—xˆÜ±µ
kæ¸f‰‰ÜGk/LÛØ6d9ò¶ùA{ƒA3š/¬D¬khÓk‰`˜"㯒r¿±Óã jx‡°e}<Ñø\3y:'À•/h½Í€Ç4~g ?Û(¼]v‘ªlKÎâ~?O‚W%{Ì:“'©úNq¾›úo(X’¥¯ˆ
nFê{Ç€ü?º'ë
ø‹ì
Þ09ŒÌç9Æ —ËC`j@ÓÄ(+a‹un¸#ÂꟋ{K`‘ÑÍÍ'à´»/Û,KW;Þ4²þð ï Nm|~fGÏ(…³Ã)«1ö­Õ
¥‡¨©ƒÃ™ü-s=à=U66Ï«Ýc蓦W¹íž®›nÔ%êÇìŒ<#Ü×84ån®Ð ÒåOC`  ñânÑs‡¢ç 1õ%Îhì½Ã½® e:ݼUZo
™`  
ÅZŸŒÊ«ê1ÏÄo$q¹Þ€©ˆhÐÉä¯ñ[!…Ú˜àJ:x2$Íß&PåT£6ç—
‡Í*4Ýšçjÿ ‰É nófÐ ó(L5C•åÆ\rMÒ@ò
}y-W}™üýVù—ú¢=Ù”c®‘< M ž
´Phr¦©TD ‘ù.$´÷O‡‘V2Æò.=IUŒ=ž‡â¬i™aþÓåÙ?òUø'ØÖ•.~* šTŒ!•-×áºTâ®ä#õü'´ eýlYÅÓeÕKÂrT"CÚ@u!Óxƒ{š3€}1¿(r}%«nËamjÑ%ÑNEò
v  ˜à  σöK³,*º.àzù¨™Ó ÚçâU¦*¿ 9{%Ö¹ njûdaXöb)  kÛƱûÓ\°M7ˆÂ=û›ç¿Ã‚­V»Cg–8ÙêE-j)k$º`Ã-ùEýeBÆÇ]c¡°ñty&Òd0nõ'¡W+ƒ*|–ø<K\%¦cÏÄ#N,Úú‘¤òÒÛõ ’¶§‰Ì
ú•dçb31Ð\7‡ëÚw82
‰KÝkÚñ'¢Ž…[&¼ÌAÔzHàP *اoßreÁY¥Ñ¾ãE|&QbKg]ã„þê*b;R³Öi‹  ±î$£ÈTm¶k÷ˆ
¦»Ù¹i¦¨6 h%Á'Ú
J   \F±â+‹b/Å9ñå5Àë­nˆRv«¯#„&î„$º’@:‘Ôrø+,àq‘秬*Úg´>µFa\GQªEAÔp5\Ǽ·¼Ç8·õ -â§Ú[
‡
uZeÖ 3}×d'+¹:ð+K†Û®s!Ï$úe€<Û”x)1»a­¡LC]¸µík…ÚàA»AYº{†ªS[¦5HÒ7ù
--,ísòDØ€èk   ÞÀîÜò@â(  ËNˆë›4ô½•/¦o‡€Û7
ê•ÆêòðÜy
'Án½µ á˜ݦ  ndeo…[ì¶Ê,¥R³Ä=À±—–ß;£™´ñSâ*g§”ïaið‘Jå~™ÓÞß³Õ¢»8x埒²52>AÊb&-÷\7´éÄù€T˜,w;3{ï˜k…à¹ÄqÀ«œ{
€\
ˆ¾[´¨јr &Úé„Ívˆ±8†¿]|¬ņ4I×pÞS1ÈÖz‰#Ìv‡G!YNògñ:màTz¢Ý1ô©^O=~ë|5Bã™ç•¼µõ•bÆ@úÕS¬ÈŒ#¬zünrŸ
û”
Z²•ï›èðV"ÁHÚý©wÝ €7¼Ìu1hÑa3Éä û f$o¿É ™Ú›ÝçnpÒ3äÌ3†Í§,Äï]$‰/pê†«À¼
¸e9­Æê_C]žƒ·ý·frÁN«,E=›Çq
-‰öŒ:aÏ¿±í&£Í:-}
84‘ÿ eƒQÑeëSsuiA
³g㟥ú£?ÿ ʼn*”“÷aühe:ÊWa@ÒÞk±eØ]
F Ô—r.åä˜@ö¥ªZoÐýYL·¥S²G/‡ñ
<~*ZÆ´è>JlòàÛƽÿ 窘ìGN¢:I®KšJp/`íIÁÀõ#Ä-€ö­šµŒoF4|ÆQØÆ@Ì|£Ô…¢À{9˜è½Üó›€ôYÒÎYsið;ís¤€à²ˆ‚4qÉVŒI$  ‰"°   æµ8cXGjœˏ¡Aâý•ËÜ¢ûïe·çLx']á"oÅÎê3¯Ç—¹”ó0nå‚âg{Œñ>
S´˜îè°g238‚ãköÝfÚd´6Ò€;ò÷±¢™¼›º¢Æ'¥Ðx'e¬ç
]bÈÆV¢ó‹kýBO
ðÊâ$Ÿ!×T
3Mýמ
žìٍàÌü‘8÷€àæØ8æ©6‰©L´«…oãpð„~Çk‰!ñ;‹”ÛžÍ àž±z Ÿôû øŸÝužÏ;ÿ #|u6™Þ¬ÚˆÐõA4¶â|ôl|Ê2ŽÇ¤ÝÅÇY.<#Aí.k§hóF‚”Y;
M½Ö4hŸ4&›­¿tès´%FìL¥£Ãk‰ÇT¤haÁ¤ÚxfÉ`ÑìË›>i 3t‚:,–+^÷´–{Û–Nxi"x‘Ûg
î¨>¥Õ܁ùZH,2Û“:8xÊ¢Çí9.É-Ìâã-=çjwµS˜dütžçwýGòú®®ûº_ˆýx$–¡ãøO
EÚÛÏ÷R„×w+3£Á£öUMyR²¹âŒ°š›¸Ñãò9§Ó_Dl+Ùßc›úšGÅÌc†Ž!Ko=¶.‘Îÿ c²(2®V mª.ÿ ¹B›¹å ù„öŸSV>™ü¯$y:G¢Z×àøúdî¹û­·ýÇ´:•c LÍõi_‹ö+ÎæGÊè>OŠ•äž´§Þ{X}¨1ÚTc›»Qþ•êô°t¿OP?eæ~É{5]•ÙR£r5†nZ\ã@
&îJõ ¾àC°þV>fé¥/ü5ñÊIº_é5;e­h<@
Ä&æÃëE%;X,ÒãÆÞ`Oò¦kŸm#˜!ÀyÄ¢|
óLšò¥Ä`
¶R=|ÈCâh5ò3DˆïF†ðÒ#ÅìÛœ?¸yhBãœí
ZxßÎÄhºRK„`Þödvײ™ÀÈÑÒgŒuYw³%†ƒÓzõ ÖÏp‚dH®¦A´ù§»ÓÇMæ~)ˆð‡û:ù&Ä •vGD´À 
n
Ý
‡¼Ö8Fö   óáà£~Ë¥x`oK|Ä?fxiØü%pìR>éò+Û±éÎ>núlFŤ'tq8LZÏvÃ?„¡ß±È⽆¯³íü@x|PöUäèØã¡ð‚ŒAìÏ"vÍwóŸÍ{ ý0.z    È•Ö{,N¡£¡ŸKÕÙž>Ýœþ ÍÀ<n^Àïe€Þgn¹”ÜiQê
9Ú±‡„è]ËA¿‚MJìiÓxŒn-ÄS6!ÓæÑû*jÎWøìšÇ뙦gj~+?\,Ö7ÁÕÊ”G™q6TF)óCç<ÓšÂUé†gW=àà“hóR³ÊQì<!÷ÇpR1¯u„De,è­vvâDß~žHå‰ú£Kìní¢ÐçÅÄÅ¥Ü÷
±ÃìÇžûƒz\þÞ¨-•‹
€

¸+¶n¿^
?†[ÖWóÒX¸,0Ø:l?‰Âý«ÿ ·Dc+fÔ[ƒ›ûªšx«kæž1KI…<#'nž¶\±íÎ8¤ìK@’@J¥v)º[Ž±Æå´¼
½Ý¡ç¯ÐO¥ø®è•Óȱ߿wša©“œt‡4îyªœ&+1ÏØ:‚æƒ=/ꎔ`hm
“=©‹]°g}ì€DgUƒ8¤qCˆãáÅ,‡Ô¬ñ10HÑDÂbáÂÿ Œ»v·:uòB6»áp‰>°<×EA!Å‚D™IúOÍ
¡>ôG}Â`ÍßkÜL™Ž  Þð™
{IøF²
¹òQ3&!ÃÂÞz.d&Ï-sH¸,Ôõ˜ŽP€
77ˆÝ¼ÊëÜw   =cÕ
Ú,ØÐ5ÎYÐ)ì´öœgŒ[¤
ßv㙑8心>h]§µháYš£²ºÑ.{Ï7Sð•?´~×SÃKýJÛ˜
™Íäiúu<µX¶1õ^kâçIÑ£sZ4h>j*ÔšD:4­¿_ ÷¸
Õxæÿ ¸?Mù _•­ÊÐ ä ÷ý ÑwL
œ­ïnTkÛUÍN©ë:¦fV ¶ÜÔÜMªÅâA½–¿R×TXš-%iTÊT•‡Ù‚JôϐZxWÑè‰f‰òG º
×Õû2aZ7OU3[“×AT–ÞŒ…-‘¤”Ì 
ì&(ˆ¿­•ƒkï’:ðY¦W‘Å)“†‘˜³Åtcø˜ñTÂwÚÇ4
|üLÇªí–v-
qˆèU
qPE.†â‘˜µ Æ,ÐÅs]8¾„oúÑ i>ÜxxÈó)ƒ ´æÁâØ$À‰vžŸf$Ž|ãw;ÀÁIJ»b`
{¦Ó¤Ú$©YÀ‘n@Óïž«9J¼êG   m¤
ܯ¹ÌW4€ÐÒÅÛ‡#褕Ÿn-?í|с¥÷Ú¹¬'´ÞÜ9ÓK`hê£SÄSà?7—Wí_´…óB›»:=Ãïq`<8ñÓŒÑlú2d¬ê³£hÖ[l|$vÝro~'R®‰§°ñmY ͧäP
|PUª¹·:3Œ[Û{Xÿ ºâ@‚W–Äé u‚ ¯´*=íή.pûÒdt @
G‰¬ s¸    ëÉücr ÞæѨÊ@>¤¢Ö±.Þ'¯°ÌME[YéïĵÂCå½
Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”
빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢
Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾
á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ]R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß
¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ 
àfPìð  .wFšir´þ’2_Y
*Æ€x\«
ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1    2Ž‰$€$I$#‰SÞ’H
ë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ# -*- Mode: cperl; coding: utf-8; cperl-indent-level: 4 -*-
# vim: ts=4 sts=4 sw=4:

use 5.006;
use strict;
package CPAN::Distroprefs;

use vars qw($VERSION);
$VERSION = '6.0001';

package CPAN::Distroprefs::Result;

use File::Spec;

sub new { bless $_[1] || {} => $_[0] }

sub abs { File::Spec->catfile($_[0]->dir, $_[0]->file) }

sub __cloner {
    my ($class, $name, $newclass) = @_;
    $newclass = 'CPAN::Distroprefs::Result::' . $newclass;
    no strict 'refs';
    *{$class . '::' . $name} = sub {
        $newclass->new({
            %{ $_[0] },
            %{ $_[1] },
        });
    };
}
BEGIN { __PACKAGE__->__cloner(as_warning => 'Warning') }
BEGIN { __PACKAGE__->__cloner(as_fatal   => 'Fatal') }
BEGIN { __PACKAGE__->__cloner(as_success => 'Success') }

sub __accessor {
    my ($class, $key) = @_;
    no strict 'refs';
    *{$class . '::' . $key} = sub { $_[0]->{$key} };
}
BEGIN { __PACKAGE__->__accessor($_) for qw(type file ext dir) }

sub is_warning { 0 }
sub is_fatal   { 0 }
sub is_success { 0 }

package CPAN::Distroprefs::Result::Error;
use vars qw(@ISA);
BEGIN { @ISA = 'CPAN::Distroprefs::Result' } ## no critic
BEGIN { __PACKAGE__->__accessor($_) for qw(msg) }

sub as_string {
    my ($self) = @_;
    if ($self->msg) {
        return sprintf $self->fmt_reason, $self->file, $self->msg;
    } else {
        return sprintf $self->fmt_unknown, $self->file;
    }
}

package CPAN::Distroprefs::Result::Warning;
use vars qw(@ISA);
BEGIN { @ISA = 'CPAN::Distroprefs::Result::Error' } ## no critic
sub is_warning { 1 }
sub fmt_reason  { "Error reading distroprefs file %s, skipping: %s" }
sub fmt_unknown { "Unknown error reading distroprefs file %s, skipping." }

package CPAN::Distroprefs::Result::Fatal;
use vars qw(@ISA);
BEGIN { @ISA = 'CPAN::Distroprefs::Result::Error' } ## no critic
sub is_fatal { 1 }
sub fmt_reason  { "Error reading distroprefs file %s: %s" }
sub fmt_unknown { "Unknown error reading distroprefs file %s." }

package CPAN::Distroprefs::Result::Success;
use vars qw(@ISA);
BEGIN { @ISA = 'CPAN::Distroprefs::Result' } ## no critic
BEGIN { __PACKAGE__->__accessor($_) for qw(prefs extension) }
sub is_success { 1 }

package CPAN::Distroprefs::Iterator;

sub new { bless $_[1] => $_[0] }

sub next { $_[0]->() }

package CPAN::Distroprefs;

use Carp ();
use DirHandle;

sub _load_method {
    my ($self, $loader, $result) = @_;
    return '_load_yaml' if $loader eq 'CPAN' or $loader =~ /^YAML(::|$)/;
    return '_load_' . $result->ext;
}

sub _load_yaml {
    my ($self, $loader, $result) = @_;
    my $data = eval {
        $loader eq 'CPAN'
        ? $loader->_yaml_loadfile($result->abs)
        : [ $loader->can('LoadFile')->($result->abs) ]
    };
    if (my $err = $@) {
        die $result->as_warning({
            msg  => $err,
        });
    } elsif (!$data) {
        die $result->as_warning;
    } else {
        return @$data;
    }
}

sub _load_dd {
    my ($self, $loader, $result) = @_;
    my @data;
    {
        package CPAN::Eval;
        # this caused a die in CPAN.pm, and I am leaving it 'fatal', though I'm
        # not sure why we wouldn't just skip the file as we do for all other
        # errors. -- hdp
        my $abs = $result->abs;
        open FH, "<$abs" or die $result->as_fatal(msg => "$!");
        local $/;
        my $eval = <FH>;
        close FH;
        no strict;
        eval $eval;
        if (my $err = $@) {
            die $result->as_warning({ msg => $err });
        }
        my $i = 1;
        while (${"VAR$i"}) {
            push @data, ${"VAR$i"};
            $i++;
        }
    }
    return @data;
}

sub _load_st {
    my ($self, $loader, $result) = @_;
    # eval because Storable is never forward compatible
    my @data = eval { @{scalar $loader->can('retrieve')->($result->abs) } };
    if (my $err = $@) {
        die $result->as_warning({ msg => $err });
    }
    return @data;
}

sub _build_file_list {
    if (@_ > 3) {
        die "_build_file_list should be called with 3 arguments, was called with more. First argument is '$_[0]'.";
    }
    my ($dir, $dir1, $ext_re) = @_;
    my @list;
    my $dh;
    unless (opendir($dh, $dir)) {
        $CPAN::Frontend->mywarn("ignoring prefs directory '$dir': $!");
        return @list;
    }
    while (my $fn = readdir $dh) {
        next if $fn eq '.' || $fn eq '..';
        if (-d "$dir/$fn") {
            next if $fn =~ /^[._]/; # prune .svn, .git, .hg, _darcs and what the user wants to hide
            push @list, _build_file_list("$dir/$fn", "$dir1$fn/", $ext_re);
        } else {
            if ($fn =~ $ext_re) {
                push @list, "$dir1$fn";
            }
        }
    }
    return @list;
}

sub find {
    my ($self, $dir, $ext_map) = @_;

    return CPAN::Distroprefs::Iterator->new(sub { return }) unless %$ext_map;

    my $possible_ext = join "|", map { quotemeta } keys %$ext_map;
    my $ext_re = qr/\.($possible_ext)$/;

    my @files = _build_file_list($dir, '', $ext_re);
    @files = sort @files if @files;

    # label the block so that we can use redo in the middle
    return CPAN::Distroprefs::Iterator->new(sub { LOOP: {

        my $fn = shift @files;
        return unless defined $fn;
        my ($ext) = $fn =~ $ext_re;

        my $loader = $ext_map->{$ext};

        my $result = CPAN::Distroprefs::Result->new({
            file => $fn, ext => $ext, dir => $dir
        });
        # copied from CPAN.pm; is this ever actually possible?
        redo unless -f $result->abs;

        my $load_method = $self->_load_method($loader, $result);
        my @prefs = eval { $self->$load_method($loader, $result) };
        if (my $err = $@) {
            if (ref($err) && eval { $err->isa('CPAN::Distroprefs::Result') }) {
                return $err;
            }
            # rethrow any exceptions that we did not generate
            die $err;
        } elsif (!@prefs) {
            # the loader should have handled this, but just in case:
            return $result->as_warning;
        }
        return $result->as_success({
            prefs => [
                map { CPAN::Distroprefs::Pref->new({ data => $_ }) } @prefs
            ],
        });
    } });
}

package CPAN::Distroprefs::Pref;

use Carp ();

sub new { bless $_[1] => $_[0] }

sub data { shift->{data} }

sub has_any_match { $_[0]->data->{match} ? 1 : 0 }

sub has_match {
    my $match = $_[0]->data->{match} || return 0;
    exists $match->{$_[1]} || exists $match->{"not_$_[1]"}
}

sub has_valid_subkeys {
    grep { exists $_[0]->data->{match}{$_} }
        map { $_, "not_$_" }
        $_[0]->match_attributes
}

sub _pattern {
    my $re = shift;
    my $p = eval sprintf 'qr{%s}', $re;
    if ($@) {
        $@ =~ s/\n$//;
        die "Error in Distroprefs pattern qr{$re}\n$@";
    }
    return $p;
}

sub _match_scalar {
    my ($match, $data) = @_;
    my $qr = _pattern($match);
    return $data =~ /$qr/;
}

sub _match_hash {
    my ($match, $data) = @_;
    for my $mkey (keys %$match) {
	(my $dkey = $mkey) =~ s/^not_//;
        my $val = defined $data->{$dkey} ? $data->{$dkey} : '';
	if (_match_scalar($match->{$mkey}, $val)) {
	    return 0 if $mkey =~ /^not_/;
	}
	else {
	    return 0 if $mkey !~ /^not_/;
	}
    }
    return 1;
}

sub _match {
    my ($self, $key, $data, $matcher) = @_;
    my $m = $self->data->{match};
    if (exists $m->{$key}) {
	return 0 unless $matcher->($m->{$key}, $data);
    }
    if (exists $m->{"not_$key"}) {
	return 0 if $matcher->($m->{"not_$key"}, $data);
    }
    return 1;
}

sub _scalar_match {
    my ($self, $key, $data) = @_;
    return $self->_match($key, $data, \&_match_scalar);
}

sub _hash_match {
    my ($self, $key, $data) = @_;
    return $self->_match($key, $data, \&_match_hash);
}

# do not take the order of C<keys %$match> because "module" is by far the
# slowest
sub match_attributes { qw(env distribution perl perlconfig module) }

sub match_module {
    my ($self, $modules) = @_;
    return $self->_match("module", $modules, sub {
	my($match, $data) = @_;
	my $qr = _pattern($match);
	for my $module (@$data) {
	    return 1 if $module =~ /$qr/;
	}
	return 0;
    });
}

sub match_distribution { shift->_scalar_match(distribution => @_) }
sub match_perl         { shift->_scalar_match(perl         => @_) }

sub match_perlconfig   { shift->_hash_match(perlconfig => @_) }
sub match_env          { shift->_hash_match(env        => @_) }

sub matches {
    my ($self, $arg) = @_;

    my $default_match = 0;
    for my $key (grep { $self->has_match($_) } $self->match_attributes) {
        unless (exists $arg->{$key}) {
            Carp::croak "Can't match pref: missing argument key $key";
        }
        $default_match = 1;
        my $val = $arg->{$key};
        # make it possible to avoid computing things until we have to
        if (ref($val) eq 'CODE') { $val = $val->() }
        my $meth = "match_$key";
        return 0 unless $self->$meth($val);
    }

    return $default_match;
}

1;

__END__

=head1 NAME

CPAN::Distroprefs -- read and match distroprefs

=head1 SYNOPSIS

    use CPAN::Distroprefs;

    my %info = (... distribution/environment info ...);

    my $finder = CPAN::Distroprefs->find($prefs_dir, \%ext_map);

    while (my $result = $finder->next) {

        die $result->as_string if $result->is_fatal;

        warn($result->as_string), next if $result->is_warning;

        for my $pref (@{ $result->prefs }) {
            if ($pref->matches(\%info)) {
                return $pref;
            }
        }
    }


=head1 DESCRIPTION

This module encapsulates reading L<Distroprefs|CPAN> and matching them against CPAN distributions.

=head1 INTERFACE

    my $finder = CPAN::Distroprefs->find($dir, \%ext_map);

    while (my $result = $finder->next) { ... }

Build an iterator which finds distroprefs files in the tree below the
given directory. Within the tree directories matching C<m/^[._]/> are
pruned.

C<%ext_map> is a hashref whose keys are file extensions and whose values are
modules used to load matching files:

    {
        'yml' => 'YAML::Syck',
        'dd'  => 'Data::Dumper',
        ...
    }

Each time C<< $finder->next >> is called, the iterator returns one of two
possible values:

=over

=item * a CPAN::Distroprefs::Result object

=item * C<undef>, indicating that no prefs files remain to be found

=back

=head1 RESULTS

L<C<find()>|/INTERFACE> returns CPAN::Distroprefs::Result objects to
indicate success or failure when reading a prefs file.

=head2 Common

All results share some common attributes:

=head3 type

C<success>, C<warning>, or C<fatal>

=head3 file

the file from which these prefs were read, or to which this error refers (relative filename)

=head3 ext

the file's extension, which determines how to load it

=head3 dir

the directory the file was read from

=head3 abs

the absolute path to the file

=head2 Errors

Error results (warning and fatal) contain:

=head3 msg

the error message (usually either C<$!> or a YAML error)

=head2 Successes

Success results contain:

=head3 prefs

an arrayref of CPAN::Distroprefs::Pref objects

=head1 PREFS

CPAN::Distroprefs::Pref objects represent individual distroprefs documents.
They are constructed automatically as part of C<success> results from C<find()>.

=head3 data

the pref information as a hashref, suitable for e.g. passing to Kwalify

=head3 match_attributes

returns a list of the valid match attributes (see the Distroprefs section in L<CPAN>)

currently: C<env perl perlconfig distribution module>

=head3 has_any_match

true if this pref has a 'match' attribute at all

=head3 has_valid_subkeys

true if this pref has a 'match' attribute and at least one valid match attribute

=head3 matches

  if ($pref->matches(\%arg)) { ... }

true if this pref matches the passed-in hashref, which must have a value for
each of the C<match_attributes> (above)

=head1 LICENSE

This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.

=cut