// Copyright (c) 2014 the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import "dart:math" show pow;
import "package:expect/expect.dart";

const whiteSpace = const [
  "",
  "\x09",
  "\x0a",
  "\x0b",
  "\x0c",
  "\x0d",
  "\x85",    /// 01: ok
  "\xa0",
  "\u1680",
  "\u180e",
  "\u2000",
  "\u2001",
  "\u2002",
  "\u2003",
  "\u2004",
  "\u2005",
  "\u2006",
  "\u2007",
  "\u2008",
  "\u2009",
  "\u200a",
  "\u2028",
  "\u2029",
  "\u202f",
  "\u205f",
  "\u3000",
  "\uFEFF"
];

void expectNumEquals(double expected, var actual, String message) {
  if (expected.isNaN) {
    Expect.isTrue(actual is double && actual.isNaN, "isNaN: $message");
  } else {
    Expect.identical(expected, actual, message);
  }
}

// Test source surrounded by any combination of whitespace.
void testParseAllWhitespace(String source, double result) {
  for (String ws1 in whiteSpace) {
    for (String ws2 in whiteSpace) {
      String padded = "$ws1$source$ws2";
      // Use Expect.identical because it also handles NaN and 0.0/-0.0.
      // Except on dart2js: http://dartbug.com/11551
      expectNumEquals(result, double.parse(padded), "parse '$padded'");
      padded = "$ws1$ws2$source";
      expectNumEquals(result, double.parse(padded), "parse '$padded'");
      padded = "$source$ws1$ws2";
      expectNumEquals(result, double.parse(padded), "parse '$padded'");
    }
  }
}

// Test source and -source surrounded by any combination of whitespace.
void testParseWhitespace(String source, double result) {
  assert(result >= 0);
  testParseAllWhitespace(source, result);
  testParseAllWhitespace("-$source", -result);
}

// Test parsing source, optionally preceeded and/or followed by whitespace.
void testParse(String source, double result, [name = ""]) {
  expectNumEquals(result, double.parse(source), "parse '$source:$name");
  expectNumEquals(result, double.parse(" $source"),
                  "parse ' $source':$name");
  expectNumEquals(result, double.parse("$source "),
                  "parse '$source ':$name");
  expectNumEquals(result, double.parse(" $source "),
                  "parse ' $source ':$name");

  expectNumEquals(result, double.parse("+$source"),
                  "parse '+$source:$name");
  expectNumEquals(result, double.parse(" +$source"),
                  "parse ' +$source':$name");
  expectNumEquals(result, double.parse("+$source "),
                  "parse '+$source ':$name");
  expectNumEquals(result, double.parse(" +$source "),
                  "parse ' +$source ':$name");

  expectNumEquals(-result, double.parse("-$source"),
                  "parse '-$source:$name");
  expectNumEquals(-result, double.parse(" -$source"),
                  "parse ' -$source':$name");
  expectNumEquals(-result, double.parse("-$source "),
                  "parse '-$source ':$name");
  expectNumEquals(-result, double.parse(" -$source "),
                  "parse ' -$source ':$name");
}

void testDouble(double value) {
  testParse("$value", value);
  if (value.isFinite) {
    String exp = value.toStringAsExponential();
    String lcexp = exp.toLowerCase();
    testParse(lcexp, value);
    String ucexp = exp.toUpperCase();
    testParse(ucexp, value);
  }
}

void testFail(String source) {
  var object = new Object();
  Expect.throws(() {
    double.parse(source, (s) {
      Expect.equals(source, s);
      throw object;
    });
  }, (e) => identical(object, e), "Fail: '$source'");
}

void main() {
  testDouble(0.0);
  testDouble(5e-324);
  testDouble(2.225073858507201e-308);
  testDouble(2.2250738585072014e-308);
  testDouble(0.49999999999999994);
  testDouble(0.5);
  testDouble(0.50000000000000006);
  testDouble(0.9999999999999999);
  testDouble(1.0);
  testDouble(1.0000000000000002);
  testDouble(4294967295.0);
  testDouble(4294967296.0);
  testDouble(4503599627370495.5);
  testDouble(4503599627370497.0);
  testDouble(9007199254740991.0);
  testDouble(9007199254740992.0);
  testDouble(1.7976931348623157e+308);
  testDouble(double.INFINITY);
  testDouble(double.NAN);

  // Strings that cannot occur from toString of a number.
  testParse("000000000000", 0.0);
  testParse("000000000001", 1.0);
  testParse("000000000000.0000000000000", 0.0);
  testParse("000000000001.0000000000000", 1.0);
  testParse("0e0", 0.0);
  testParse("0e+0", 0.0);
  testParse("0e-0", 0.0);
  testParse("1e0", 1.0);
  testParse("1e+0", 1.0);
  testParse("1e-0", 1.0);
  testParse("1.", 1.0);
  testParse(".1", 0.1);
  testParse("1.e1", 10.0);
  testParse(".1e1", 1.0);
  testParse("Infinity", double.INFINITY);
  testParse("NaN", double.NAN);

  // Cases where mantissa and 10^exponent are representable as a double.
  for (int i = -22; i <= 22; i++) {
    for (double j in [1.0, 9007199254740991.0, 9007199254740992.0]) {
      var value = (i >= 0) ? j * pow(10.0, i) : j / pow(10.0, -i);
      testParse("${j}e$i", value, "$i/$j");
      testParse("${j}E$i", value, "$i/$j");
      if (i >= 0) {
        testParse("${j}e+$i", value, "$i/$j");
        testParse("${j}E+$i", value, "$i/$j");
      }
    }
  }
  for (int i = 0; i <= 22; i++) {
    var digits = "9007199254740991";
    for (int i = 0; i < digits.length; i++) {
      int dotIndex = digits.length - i;
      var string = "${digits.substring(0, dotIndex)}."
                   "${digits.substring(dotIndex)}e$i";
      testParse(string, 9007199254740991.0);
    }
  }

  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000012351641146031163604414219821705534309126495065358119110639"
            "6420625168876817552187966324959090408998094949141173861429432731"
            "6641775889849490996936990026954695315751782975778511319614542919"
            "6224552592217965901424968268076250159685228839124609682811834931"
            "8292403785007928846349518531559641397792756664639171692046759890"
            "0776562329863178978731138323263641361002818700324274998854829973"
            "5227010414083113118928696725368169503983880965288753370088162336"
            "8004844756702677687292583305671118833393020810798402309572336459"
            "2015026502876542452438269585569329582311976245631182694093981811"
            "9686640211945509336174248834117544931694293962814151377997828762"
            "2277536275946568454181273895934743339974841620248529105142565927"
            "256981069188614130727188467062660492956638336181640625",
            0.0);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000024703282292062327208828439643411068618252990130716238221279"
            "2841250337753635104375932649918180817996189898282347722858865463"
            "3283551779698981993873980053909390631503565951557022639229085839"
            "2449105184435931802849936536152500319370457678249219365623669863"
            "6584807570015857692699037063119282795585513329278343384093519780"
            "1553124659726357957462276646527282722005637400648549997709659947"
            "0454020828166226237857393450736339007967761930577506740176324673"
            "6009689513405355374585166611342237666786041621596804619144672918"
            "4030053005753084904876539171138659164623952491262365388187963623"
            "9373280423891018672348497668235089863388587925628302755995657524"
            "4555072551893136908362547791869486679949683240497058210285131854"
            "51396213837722826145437693412532098591327667236328125",
            0.0);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000024703282292062327208828439643411068618252990130716238221279"
            "2841250337753635104375932649918180817996189898282347722858865463"
            "3283551779698981993873980053909390631503565951557022639229085839"
            "2449105184435931802849936536152500319370457678249219365623669863"
            "6584807570015857692699037063119282795585513329278343384093519780"
            "1553124659726357957462276646527282722005637400648549997709659947"
            "0454020828166226237857393450736339007967761930577506740176324673"
            "6009689513405355374585166611342237666786041621596804619144672918"
            "4030053005753084904876539171138659164623952491262365388187963623"
            "9373280423891018672348497668235089863388587925628302755995657524"
            "4555072551893136908362547791869486679949683240497058210285131854"
            "51396213837722826145437693412532098591327667236328125",
            0.0);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000024703282292062327208828439643411068627545332140664243314532"
            "8041234170109088178685677591650492652607243027730579814636067699"
            "1112238669661707327453443265068702897439863329200619332642599205"
            "1806252781222000513169502627641523911022607448403553068808609405"
            "1727798181294290864842608522062097649849550765341204993205100587"
            "2127469658709242016690593998242808606978027857019419997429604579"
            "7572623273334010723772922131119806567715298322567005234345331218"
            "5169920860031716486480793611343761679481328431956040281530986197"
            "8304604971452253283193290744072288902141724247846767401941767720"
            "8561650585989659548591956327689896895290365125294085321852619688"
            "9863888974446146846024033780172178553364579041996676675092137151"
            "9705456298034409473812692774776868254618683783877327369245051207"
            "5931578479504396230612962142122846982018227555473696607567828620"
            "5497859173707553281928994692862033843994140625",
            5e-324);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000037054923438093490813242659465116602918087143186126352238665"
            "4061891674274999582254154033144959392383231717975289492511095959"
            "2096640779585747657231506869704773681319051549691937265430115392"
            "9316510179867828993955338712739726887403536747219495345250565253"
            "9734220743745353366904984135736109339114232557854653467028698863"
            "1755341990606652876965097618075398198036065644601954996844545287"
            "8562428797081554870870561495721040952204106503876761616095480465"
            "4854302923481671949982122917011832487483775622035971266330696098"
            "1770527542930458978998057183774359009418156980309146068528141338"
            "9871550473737887132279287842897827763181104688776671568136524122"
            "1523792405286695424882335699501538146509629059245968850620692484"
            "3143597161396297062546730578356156393213233025204703880754948792"
            "4068421520495603769387037857877153017981772444526303392432171379"
            "4502140826292446718071005307137966156005859375",
            5e-324);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000037054923438093490813242659465116602927379485196074357331918"
            "9261875506630452656563898974877271226994284847423521584288298194"
            "9925327669548472990810970080864085947255348927335533958843628758"
            "8673657776653897704274904804228750479055686517373829048435504795"
            "4877211355023786539048555594678924193378269993917515076140279670"
            "2329686989589536936193414969790924083008456100972824996564489920"
            "5681031242249339356786090176104508511951642895866260110264487010"
            "4014534270108033061877749917013356500179062432395206928717009377"
            "6045079508629627357314808756707988746935928736893548082281945435"
            "9059920635836528008522746502352634795082881888442454133993486286"
            "6832608827839705362543821687804230019924524860745587315427697781"
            "770943207565842392181565401187981478869915008544921875",
            5e-324);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000037054923438093490813242659465116602936671827206022362425172"
            "4461859338985905730873643916609583061605337976871753676065500430"
            "7754014559511198324390433292023398213191646304979130652257142124"
            "8030805373439966414594470895717774070707836287528162751620444337"
            "0020201966302219711192127053621739047642307429980376685251860477"
            "2904031988572420995421732321506449967980846557343694996284434553"
            "2799633687417123842701618856487976071699179287855758604433493555"
            "3174765616734394173773376917014880512874349242754442591103322657"
            "0319631474328795735631560329641618484453700493477950096035749532"
            "8248290797935168884766205161807441826984659088108236699850448451"
            "2141425250392715300205307676106921893339420662245205780234703079"
            "2275266989920550781084577445403473184185067145693733619245051207"
            "5931578479504396230612962142122846982018227555473696607567828620"
            "5497859173707553281928994692862033843994140625",
            5e-324);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000049406564584124654417656879286822137236505980261432476442558"
            "5682500675507270208751865299836361635992379796564695445717730926"
            "6567103559397963987747960107818781263007131903114045278458171678"
            "4898210368871863605699873072305000638740915356498438731247339727"
            "3169615140031715385398074126238565591171026658556686768187039560"
            "3106249319452715914924553293054565444011274801297099995419319894"
            "0908041656332452475714786901472678015935523861155013480352649347"
            "2019379026810710749170333222684475333572083243193609238289345836"
            "8060106011506169809753078342277318329247904982524730776375927247"
            "8746560847782037344696995336470179726777175851256605511991315048"
            "9110145103786273816725095583738973359899366480994116420570263709"
            "0279242767544565229087538682506419718265533447265625",
            5e-324);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000049406564584124654417656879286822137255090664281328486629065"
            "6082468340218176357371355183300985305214486055461159629272135398"
            "2224477339323414654906886530137405794879726658401238665285198410"
            "3612505562444001026339005255283047822045214896807106137617218810"
            "3455596362588581729685217044124195299699101530682409986410201174"
            "4254939317418484033381187996485617213956055714038839994859209159"
            "5145246546668021447545844262239613135430596645134010468690662437"
            "0339841720063432972961587222687523358962656863912080563061972395"
            "6609209942904506566386581488144577804283448495693534803883535441"
            "7123301171979319097183912655379793790580730250588170643705239377"
            "9727777948892293692048067560344357106729158083993353350184274303"
            "9410912596068818947625385549553736509237367567754654738490102415"
            "1863156959008792461225924284245693964036455110947393215135657241"
            "099571834741510656385798938572406768798828125",
            5e-324);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000074109846876186981626485318930233205836174286372252704477330"
            "8123783348549999164508308066289918784766463435950578985022191918"
            "4193281559171495314463013739409547362638103099383874530860230785"
            "8633020359735657987910677425479453774807073494438990690501130507"
            "9468441487490706733809968271472218678228465115709306934057397726"
            "3510683981213305753930195236150796396072131289203909993689090575"
            "7124857594163109741741122991442081904408213007753523232190960930"
            "9708605846963343899964245834023664974967551244071942532661392196"
            "3541055085860917957996114367548718018836313960618292137056282677"
            "9743100947475774264558575685795655526362209377553343136273048244"
            "3047584810573390849764671399003076293019258118491937701241384968"
            "6287194322792594125093461156712312786426466050409407761509897584"
            "8136843040991207538774075715754306035963544889052606784864342758"
            "900428165258489343614201061427593231201171875",
            5e-324);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000074109846876186981626485318930233205854758970392148714663837"
            "8523751013260905313127797949754542453988569694847043168576596389"
            "9850655339096945981621940161728171894510697854671067917687257517"
            "7347315553307795408549809608457500958111373034747658096871009590"
            "9754422710047573078097111189357848386756539987835030152280559340"
            "4659373979179073872386829939581848166016912201945649993128979841"
            "1362062484498678713572180352209017023903285791732520220528974020"
            "8029068540216066123755499834026713000358124864790413857434018755"
            "2090159017259254714629617513415977493871857473787096164563890871"
            "8119841271673056017045493004705269590165763776884908267986972573"
            "3665217655679410725087643375608460039849049721491174630855395563"
            "54188641513168478436313080237596295773983001708984375",
            1e-323);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000074109846876186981626485318930233205873343654412044724850344"
            "8923718677971811461747287833219166123210675953743507352131000861"
            "5508029119022396648780866584046796426383292609958261304514284249"
            "6061610746879932829188941791435548141415672575056325503240888674"
            "0040403932604439422384254107243478095284614859960753370503720954"
            "5808063977144841990843464643012899935961693114687389992568869106"
            "5599267374834247685403237712975952143398358575711517208866987110"
            "6349531233468788347546753834029761025748698485508885182206645314"
            "0639262948657591471263120659283236968907400986955900192071499065"
            "6496581595870337769532410323614883653969318176216473399700896902"
            "4282850500785430600410615352213843786678841324490411560469406158"
            "4550533979841101562169154890806946368370134291387467238490102415"
            "1863156959008792461225924284245693964036455110947393215135657241"
            "099571834741510656385798938572406768798828125",
            1e-323);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000011125369292"
            "5360069154511635866620203210960799023116591527666370844360221740"
            "6959097927141579506255510282033669865517905502576217080776730054"
            "4280061926888594105653889967660011652398050737212918180359607825"
            "2347125186710418762540332530832907947436024558998429581982425031"
            "7954385059152437399890443876874974725790225802525457699928291235"
            "4093225567689679024960579905428830259962166760571761950743978498"
            "0479564444580149632075553173315669683173879325651468588102366281"
            "5890742832175436061414318821022423405703806955738531400844926622"
            "0550120807237108092835830752700771425423583764509515806613894483"
            "6485368656166704349449158753391942346304638698898642932982747054"
            "5684547703068233784351199339157645340492308605462312698364257812"
            "5",
            1.1125369292536007e-308);
  testParse("0.00000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000000000000000"
            "0000000000000000000000000000000000000000000000000000011125369292"
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            "68444365510704342711559699508093042880177904174497792",
            double.INFINITY);
  testParse("1797693134862315807937289714053034150799341327100378344436906077"
            "8514519826392244645590587928934680064583382309459227867357811816"
            "7083648350040856069002886669235928086706171002858964521148060973"
            "2932253823701752298952982895505254202514482107240818876126988420"
            "86346991665034681756244316627357656767417501840572416",
            double.INFINITY);

  // Edge cases of algorithm (e+-22/23).
  testParse("1e22", 1e22);
  testParse("1e23", 1e23);
  testParse("1e-22", 1e-22);
  testParse("1e-23", 1e-23);

  testParseWhitespace("1", 1.0);
  testParseWhitespace("1.0", 1.0);
  testParseWhitespace("1e1", 10.0);
  testParseWhitespace(".1e1", 1.0);
  testParseWhitespace("1.e1", 10.0);
  testParseWhitespace("1e+1", 10.0);
  testParseWhitespace("1e-1", 0.1);

  // Negative tests - things not to allow.

  // Spaces inside the numeral.
  testFail("- 1");
  testFail("+ 1");
  testFail("2 2");
  testFail("1 .");
  testFail(". 1");
  testFail("1e 2");
  testFail("1 e2");
  // Invalid characters.
  testFail("0x0");
  testFail("0x1H");
  testFail("12H");
  testFail("1x2");
  testFail("00x2");
  testFail("0x2.2");
  // Double exponent without value.
  testFail(".e1");
  testFail("e1");
  testFail("e+1");
  testFail("e-1");
  testFail("-e1");
  testFail("-e+1");
  testFail("-e-1");
  // Too many signs.
  testFail("--1");
  testFail("-+1");
  testFail("+-1");
  testFail("++1");
  // Incorrect ways to write NaN/Infinity.
  testFail("infinity");
  testFail("INFINITY");
  testFail("1.#INF");
  testFail("inf");
  testFail("nan");
  testFail("NAN");
  testFail("1.#IND");
  testFail("indef");
  testFail("qnan");
  testFail("snan");
}