type EntityReference = { length: number; text: string }

const entityReferenceSource = '&(?:[A-Za-z][A-Za-z0-9]{1,31}|#\\d{1,7}|#[Xx][A-Fa-f0-9]{1,6});'
const anchoredEntityReference = new RegExp(`(?:${entityReferenceSource})`, 'y')
const decimalReference = /^&#(\d+);/
const hexadecimalReference = /^&#[Xx]([A-Fa-f0-9]+);/
const largestCodePoint = 0x10ffff
export const replacementCharacter = '\ufffd'
const surrogates = { first: 0xd800, last: 0xdfff }

// HTML5's named character references (https://html.spec.whatwg.org/entities.json), the semicolon-terminated half
// CommonMark decodes. Name and characters part on a tilde, references on a space, neither of which any value holds.
const packedReferences =
  'AElig~Æ AMP~& Aacute~Á Abreve~Ă Acirc~Â Acy~А Afr~𝔄 Agrave~À Alpha~Α Amacr~Ā And~⩓ Aogon~Ą Aopf~𝔸\
  ApplyFunction~⁡ Aring~Å Ascr~𝒜 Assign~≔ Atilde~Ã Auml~Ä Backslash~∖ Barv~⫧ Barwed~⌆ Bcy~Б Because~∵ Bernoullis~ℬ\
  Beta~Β Bfr~𝔅 Bopf~𝔹 Breve~˘ Bscr~ℬ Bumpeq~≎ CHcy~Ч COPY~© Cacute~Ć Cap~⋒ CapitalDifferentialD~ⅅ Cayleys~ℭ\
  Ccaron~Č Ccedil~Ç Ccirc~Ĉ Cconint~∰ Cdot~Ċ Cedilla~¸ CenterDot~· Cfr~ℭ Chi~Χ CircleDot~⊙ CircleMinus~⊖\
  CirclePlus~⊕ CircleTimes~⊗ ClockwiseContourIntegral~∲ CloseCurlyDoubleQuote~” CloseCurlyQuote~’ Colon~∷ Colone~⩴\
  Congruent~≡ Conint~∯ ContourIntegral~∮ Copf~ℂ Coproduct~∐ CounterClockwiseContourIntegral~∳ Cross~⨯ Cscr~𝒞 Cup~⋓\
  CupCap~≍ DD~ⅅ DDotrahd~⤑ DJcy~Ђ DScy~Ѕ DZcy~Џ Dagger~‡ Darr~↡ Dashv~⫤ Dcaron~Ď Dcy~Д Del~∇ Delta~Δ Dfr~𝔇\
  DiacriticalAcute~´ DiacriticalDot~˙ DiacriticalDoubleAcute~˝ DiacriticalGrave~` DiacriticalTilde~˜ Diamond~⋄\
  DifferentialD~ⅆ Dopf~𝔻 Dot~¨ DotDot~⃜ DotEqual~≐ DoubleContourIntegral~∯ DoubleDot~¨ DoubleDownArrow~⇓\
  DoubleLeftArrow~⇐ DoubleLeftRightArrow~⇔ DoubleLeftTee~⫤ DoubleLongLeftArrow~⟸ DoubleLongLeftRightArrow~⟺\
  DoubleLongRightArrow~⟹ DoubleRightArrow~⇒ DoubleRightTee~⊨ DoubleUpArrow~⇑ DoubleUpDownArrow~⇕ DoubleVerticalBar~∥\
  DownArrow~↓ DownArrowBar~⤓ DownArrowUpArrow~⇵ DownBreve~̑ DownLeftRightVector~⥐ DownLeftTeeVector~⥞\
  DownLeftVector~↽ DownLeftVectorBar~⥖ DownRightTeeVector~⥟ DownRightVector~⇁ DownRightVectorBar~⥗ DownTee~⊤\
  DownTeeArrow~↧ Downarrow~⇓ Dscr~𝒟 Dstrok~Đ ENG~Ŋ ETH~Ð Eacute~É Ecaron~Ě Ecirc~Ê Ecy~Э Edot~Ė Efr~𝔈 Egrave~È\
  Element~∈ Emacr~Ē EmptySmallSquare~◻ EmptyVerySmallSquare~▫ Eogon~Ę Eopf~𝔼 Epsilon~Ε Equal~⩵ EqualTilde~≂\
  Equilibrium~⇌ Escr~ℰ Esim~⩳ Eta~Η Euml~Ë Exists~∃ ExponentialE~ⅇ Fcy~Ф Ffr~𝔉 FilledSmallSquare~◼\
  FilledVerySmallSquare~▪ Fopf~𝔽 ForAll~∀ Fouriertrf~ℱ Fscr~ℱ GJcy~Ѓ GT~> Gamma~Γ Gammad~Ϝ Gbreve~Ğ Gcedil~Ģ\
  Gcirc~Ĝ Gcy~Г Gdot~Ġ Gfr~𝔊 Gg~⋙ Gopf~𝔾 GreaterEqual~≥ GreaterEqualLess~⋛ GreaterFullEqual~≧ GreaterGreater~⪢\
  GreaterLess~≷ GreaterSlantEqual~⩾ GreaterTilde~≳ Gscr~𝒢 Gt~≫ HARDcy~Ъ Hacek~ˇ Hat~^ Hcirc~Ĥ Hfr~ℌ HilbertSpace~ℋ\
  Hopf~ℍ HorizontalLine~─ Hscr~ℋ Hstrok~Ħ HumpDownHump~≎ HumpEqual~≏ IEcy~Е IJlig~IJ IOcy~Ё Iacute~Í Icirc~Î Icy~И\
  Idot~İ Ifr~ℑ Igrave~Ì Im~ℑ Imacr~Ī ImaginaryI~ⅈ Implies~⇒ Int~∬ Integral~∫ Intersection~⋂ InvisibleComma~⁣\
  InvisibleTimes~⁢ Iogon~Į Iopf~𝕀 Iota~Ι Iscr~ℐ Itilde~Ĩ Iukcy~І Iuml~Ï Jcirc~Ĵ Jcy~Й Jfr~𝔍 Jopf~𝕁 Jscr~𝒥\
  Jsercy~Ј Jukcy~Є KHcy~Х KJcy~Ќ Kappa~Κ Kcedil~Ķ Kcy~К Kfr~𝔎 Kopf~𝕂 Kscr~𝒦 LJcy~Љ LT~< Lacute~Ĺ Lambda~Λ Lang~⟪\
  Laplacetrf~ℒ Larr~↞ Lcaron~Ľ Lcedil~Ļ Lcy~Л LeftAngleBracket~⟨ LeftArrow~← LeftArrowBar~⇤ LeftArrowRightArrow~⇆\
  LeftCeiling~⌈ LeftDoubleBracket~⟦ LeftDownTeeVector~⥡ LeftDownVector~⇃ LeftDownVectorBar~⥙ LeftFloor~⌊\
  LeftRightArrow~↔ LeftRightVector~⥎ LeftTee~⊣ LeftTeeArrow~↤ LeftTeeVector~⥚ LeftTriangle~⊲ LeftTriangleBar~⧏\
  LeftTriangleEqual~⊴ LeftUpDownVector~⥑ LeftUpTeeVector~⥠ LeftUpVector~↿ LeftUpVectorBar~⥘ LeftVector~↼\
  LeftVectorBar~⥒ Leftarrow~⇐ Leftrightarrow~⇔ LessEqualGreater~⋚ LessFullEqual~≦ LessGreater~≶ LessLess~⪡\
  LessSlantEqual~⩽ LessTilde~≲ Lfr~𝔏 Ll~⋘ Lleftarrow~⇚ Lmidot~Ŀ LongLeftArrow~⟵ LongLeftRightArrow~⟷\
  LongRightArrow~⟶ Longleftarrow~⟸ Longleftrightarrow~⟺ Longrightarrow~⟹ Lopf~𝕃 LowerLeftArrow~↙ LowerRightArrow~↘\
  Lscr~ℒ Lsh~↰ Lstrok~Ł Lt~≪ Map~⤅ Mcy~М MediumSpace~  Mellintrf~ℳ Mfr~𝔐 MinusPlus~∓ Mopf~𝕄 Mscr~ℳ Mu~Μ NJcy~Њ\
  Nacute~Ń Ncaron~Ň Ncedil~Ņ Ncy~Н NegativeMediumSpace~​ NegativeThickSpace~​ NegativeThinSpace~​\
  NegativeVeryThinSpace~​ NestedGreaterGreater~≫ NestedLessLess~≪ NewLine~\n Nfr~𝔑 NoBreak~⁠ NonBreakingSpace~ \
  Nopf~ℕ Not~⫬ NotCongruent~≢ NotCupCap~≭ NotDoubleVerticalBar~∦ NotElement~∉ NotEqual~≠ NotEqualTilde~≂̸\
  NotExists~∄ NotGreater~≯ NotGreaterEqual~≱ NotGreaterFullEqual~≧̸ NotGreaterGreater~≫̸ NotGreaterLess~≹\
  NotGreaterSlantEqual~⩾̸ NotGreaterTilde~≵ NotHumpDownHump~≎̸ NotHumpEqual~≏̸ NotLeftTriangle~⋪\
  NotLeftTriangleBar~⧏̸ NotLeftTriangleEqual~⋬ NotLess~≮ NotLessEqual~≰ NotLessGreater~≸ NotLessLess~≪̸\
  NotLessSlantEqual~⩽̸ NotLessTilde~≴ NotNestedGreaterGreater~⪢̸ NotNestedLessLess~⪡̸ NotPrecedes~⊀\
  NotPrecedesEqual~⪯̸ NotPrecedesSlantEqual~⋠ NotReverseElement~∌ NotRightTriangle~⋫ NotRightTriangleBar~⧐̸\
  NotRightTriangleEqual~⋭ NotSquareSubset~⊏̸ NotSquareSubsetEqual~⋢ NotSquareSuperset~⊐̸ NotSquareSupersetEqual~⋣\
  NotSubset~⊂⃒ NotSubsetEqual~⊈ NotSucceeds~⊁ NotSucceedsEqual~⪰̸ NotSucceedsSlantEqual~⋡ NotSucceedsTilde~≿̸\
  NotSuperset~⊃⃒ NotSupersetEqual~⊉ NotTilde~≁ NotTildeEqual~≄ NotTildeFullEqual~≇ NotTildeTilde~≉ NotVerticalBar~∤\
  Nscr~𝒩 Ntilde~Ñ Nu~Ν OElig~Œ Oacute~Ó Ocirc~Ô Ocy~О Odblac~Ő Ofr~𝔒 Ograve~Ò Omacr~Ō Omega~Ω Omicron~Ο Oopf~𝕆\
  OpenCurlyDoubleQuote~“ OpenCurlyQuote~‘ Or~⩔ Oscr~𝒪 Oslash~Ø Otilde~Õ Otimes~⨷ Ouml~Ö OverBar~‾ OverBrace~⏞\
  OverBracket~⎴ OverParenthesis~⏜ PartialD~∂ Pcy~П Pfr~𝔓 Phi~Φ Pi~Π PlusMinus~± Poincareplane~ℌ Popf~ℙ Pr~⪻\
  Precedes~≺ PrecedesEqual~⪯ PrecedesSlantEqual~≼ PrecedesTilde~≾ Prime~″ Product~∏ Proportion~∷ Proportional~∝\
  Pscr~𝒫 Psi~Ψ QUOT~" Qfr~𝔔 Qopf~ℚ Qscr~𝒬 RBarr~⤐ REG~® Racute~Ŕ Rang~⟫ Rarr~↠ Rarrtl~⤖ Rcaron~Ř Rcedil~Ŗ Rcy~Р\
  Re~ℜ ReverseElement~∋ ReverseEquilibrium~⇋ ReverseUpEquilibrium~⥯ Rfr~ℜ Rho~Ρ RightAngleBracket~⟩ RightArrow~→\
  RightArrowBar~⇥ RightArrowLeftArrow~⇄ RightCeiling~⌉ RightDoubleBracket~⟧ RightDownTeeVector~⥝ RightDownVector~⇂\
  RightDownVectorBar~⥕ RightFloor~⌋ RightTee~⊢ RightTeeArrow~↦ RightTeeVector~⥛ RightTriangle~⊳ RightTriangleBar~⧐\
  RightTriangleEqual~⊵ RightUpDownVector~⥏ RightUpTeeVector~⥜ RightUpVector~↾ RightUpVectorBar~⥔ RightVector~⇀\
  RightVectorBar~⥓ Rightarrow~⇒ Ropf~ℝ RoundImplies~⥰ Rrightarrow~⇛ Rscr~ℛ Rsh~↱ RuleDelayed~⧴ SHCHcy~Щ SHcy~Ш\
  SOFTcy~Ь Sacute~Ś Sc~⪼ Scaron~Š Scedil~Ş Scirc~Ŝ Scy~С Sfr~𝔖 ShortDownArrow~↓ ShortLeftArrow~← ShortRightArrow~→\
  ShortUpArrow~↑ Sigma~Σ SmallCircle~∘ Sopf~𝕊 Sqrt~√ Square~□ SquareIntersection~⊓ SquareSubset~⊏\
  SquareSubsetEqual~⊑ SquareSuperset~⊐ SquareSupersetEqual~⊒ SquareUnion~⊔ Sscr~𝒮 Star~⋆ Sub~⋐ Subset~⋐\
  SubsetEqual~⊆ Succeeds~≻ SucceedsEqual~⪰ SucceedsSlantEqual~≽ SucceedsTilde~≿ SuchThat~∋ Sum~∑ Sup~⋑ Superset~⊃\
  SupersetEqual~⊇ Supset~⋑ THORN~Þ TRADE~™ TSHcy~Ћ TScy~Ц Tab~\t Tau~Τ Tcaron~Ť Tcedil~Ţ Tcy~Т Tfr~𝔗 Therefore~∴\
  Theta~Θ ThickSpace~   ThinSpace~  Tilde~∼ TildeEqual~≃ TildeFullEqual~≅ TildeTilde~≈ Topf~𝕋 TripleDot~⃛ Tscr~𝒯\
  Tstrok~Ŧ Uacute~Ú Uarr~↟ Uarrocir~⥉ Ubrcy~Ў Ubreve~Ŭ Ucirc~Û Ucy~У Udblac~Ű Ufr~𝔘 Ugrave~Ù Umacr~Ū UnderBar~_\
  UnderBrace~⏟ UnderBracket~⎵ UnderParenthesis~⏝ Union~⋃ UnionPlus~⊎ Uogon~Ų Uopf~𝕌 UpArrow~↑ UpArrowBar~⤒\
  UpArrowDownArrow~⇅ UpDownArrow~↕ UpEquilibrium~⥮ UpTee~⊥ UpTeeArrow~↥ Uparrow~⇑ Updownarrow~⇕ UpperLeftArrow~↖\
  UpperRightArrow~↗ Upsi~ϒ Upsilon~Υ Uring~Ů Uscr~𝒰 Utilde~Ũ Uuml~Ü VDash~⊫ Vbar~⫫ Vcy~В Vdash~⊩ Vdashl~⫦ Vee~⋁\
  Verbar~‖ Vert~‖ VerticalBar~∣ VerticalLine~| VerticalSeparator~❘ VerticalTilde~≀ VeryThinSpace~  Vfr~𝔙 Vopf~𝕍\
  Vscr~𝒱 Vvdash~⊪ Wcirc~Ŵ Wedge~⋀ Wfr~𝔚 Wopf~𝕎 Wscr~𝒲 Xfr~𝔛 Xi~Ξ Xopf~𝕏 Xscr~𝒳 YAcy~Я YIcy~Ї YUcy~Ю Yacute~Ý\
  Ycirc~Ŷ Ycy~Ы Yfr~𝔜 Yopf~𝕐 Yscr~𝒴 Yuml~Ÿ ZHcy~Ж Zacute~Ź Zcaron~Ž Zcy~З Zdot~Ż ZeroWidthSpace~​ Zeta~Ζ Zfr~ℨ\
  Zopf~ℤ Zscr~𝒵 aacute~á abreve~ă ac~∾ acE~∾̳ acd~∿ acirc~â acute~´ acy~а aelig~æ af~⁡ afr~𝔞 agrave~à alefsym~ℵ\
  aleph~ℵ alpha~α amacr~ā amalg~⨿ amp~& and~∧ andand~⩕ andd~⩜ andslope~⩘ andv~⩚ ang~∠ ange~⦤ angle~∠ angmsd~∡\
  angmsdaa~⦨ angmsdab~⦩ angmsdac~⦪ angmsdad~⦫ angmsdae~⦬ angmsdaf~⦭ angmsdag~⦮ angmsdah~⦯ angrt~∟ angrtvb~⊾\
  angrtvbd~⦝ angsph~∢ angst~Å angzarr~⍼ aogon~ą aopf~𝕒 ap~≈ apE~⩰ apacir~⩯ ape~≊ apid~≋ apos~\' approx~≈ approxeq~≊\
  aring~å ascr~𝒶 ast~* asymp~≈ asympeq~≍ atilde~ã auml~ä awconint~∳ awint~⨑ bNot~⫭ backcong~≌ backepsilon~϶\
  backprime~‵ backsim~∽ backsimeq~⋍ barvee~⊽ barwed~⌅ barwedge~⌅ bbrk~⎵ bbrktbrk~⎶ bcong~≌ bcy~б bdquo~„ becaus~∵\
  because~∵ bemptyv~⦰ bepsi~϶ bernou~ℬ beta~β beth~ℶ between~≬ bfr~𝔟 bigcap~⋂ bigcirc~◯ bigcup~⋃ bigodot~⨀\
  bigoplus~⨁ bigotimes~⨂ bigsqcup~⨆ bigstar~★ bigtriangledown~▽ bigtriangleup~△ biguplus~⨄ bigvee~⋁ bigwedge~⋀\
  bkarow~⤍ blacklozenge~⧫ blacksquare~▪ blacktriangle~▴ blacktriangledown~▾ blacktriangleleft~◂ blacktriangleright~▸\
  blank~␣ blk12~▒ blk14~░ blk34~▓ block~█ bne~=⃥ bnequiv~≡⃥ bnot~⌐ bopf~𝕓 bot~⊥ bottom~⊥ bowtie~⋈ boxDL~╗ boxDR~╔\
  boxDl~╖ boxDr~╓ boxH~═ boxHD~╦ boxHU~╩ boxHd~╤ boxHu~╧ boxUL~╝ boxUR~╚ boxUl~╜ boxUr~╙ boxV~║ boxVH~╬ boxVL~╣\
  boxVR~╠ boxVh~╫ boxVl~╢ boxVr~╟ boxbox~⧉ boxdL~╕ boxdR~╒ boxdl~┐ boxdr~┌ boxh~─ boxhD~╥ boxhU~╨ boxhd~┬ boxhu~┴\
  boxminus~⊟ boxplus~⊞ boxtimes~⊠ boxuL~╛ boxuR~╘ boxul~┘ boxur~└ boxv~│ boxvH~╪ boxvL~╡ boxvR~╞ boxvh~┼ boxvl~┤\
  boxvr~├ bprime~‵ breve~˘ brvbar~¦ bscr~𝒷 bsemi~⁏ bsim~∽ bsime~⋍ bsol~\\ bsolb~⧅ bsolhsub~⟈ bull~• bullet~• bump~≎\
  bumpE~⪮ bumpe~≏ bumpeq~≏ cacute~ć cap~∩ capand~⩄ capbrcup~⩉ capcap~⩋ capcup~⩇ capdot~⩀ caps~∩︀ caret~⁁ caron~ˇ\
  ccaps~⩍ ccaron~č ccedil~ç ccirc~ĉ ccups~⩌ ccupssm~⩐ cdot~ċ cedil~¸ cemptyv~⦲ cent~¢ centerdot~· cfr~𝔠 chcy~ч\
  check~✓ checkmark~✓ chi~χ cir~○ cirE~⧃ circ~ˆ circeq~≗ circlearrowleft~↺ circlearrowright~↻ circledR~® circledS~Ⓢ\
  circledast~⊛ circledcirc~⊚ circleddash~⊝ cire~≗ cirfnint~⨐ cirmid~⫯ cirscir~⧂ clubs~♣ clubsuit~♣ colon~: colone~≔\
  coloneq~≔ comma~, commat~@ comp~∁ compfn~∘ complement~∁ complexes~ℂ cong~≅ congdot~⩭ conint~∮ copf~𝕔 coprod~∐\
  copy~© copysr~℗ crarr~↵ cross~✗ cscr~𝒸 csub~⫏ csube~⫑ csup~⫐ csupe~⫒ ctdot~⋯ cudarrl~⤸ cudarrr~⤵ cuepr~⋞ cuesc~⋟\
  cularr~↶ cularrp~⤽ cup~∪ cupbrcap~⩈ cupcap~⩆ cupcup~⩊ cupdot~⊍ cupor~⩅ cups~∪︀ curarr~↷ curarrm~⤼ curlyeqprec~⋞\
  curlyeqsucc~⋟ curlyvee~⋎ curlywedge~⋏ curren~¤ curvearrowleft~↶ curvearrowright~↷ cuvee~⋎ cuwed~⋏ cwconint~∲\
  cwint~∱ cylcty~⌭ dArr~⇓ dHar~⥥ dagger~† daleth~ℸ darr~↓ dash~‐ dashv~⊣ dbkarow~⤏ dblac~˝ dcaron~ď dcy~д dd~ⅆ\
  ddagger~‡ ddarr~⇊ ddotseq~⩷ deg~° delta~δ demptyv~⦱ dfisht~⥿ dfr~𝔡 dharl~⇃ dharr~⇂ diam~⋄ diamond~⋄ diamondsuit~♦\
  diams~♦ die~¨ digamma~ϝ disin~⋲ div~÷ divide~÷ divideontimes~⋇ divonx~⋇ djcy~ђ dlcorn~⌞ dlcrop~⌍ dollar~$ dopf~𝕕\
  dot~˙ doteq~≐ doteqdot~≑ dotminus~∸ dotplus~∔ dotsquare~⊡ doublebarwedge~⌆ downarrow~↓ downdownarrows~⇊\
  downharpoonleft~⇃ downharpoonright~⇂ drbkarow~⤐ drcorn~⌟ drcrop~⌌ dscr~𝒹 dscy~ѕ dsol~⧶ dstrok~đ dtdot~⋱ dtri~▿\
  dtrif~▾ duarr~⇵ duhar~⥯ dwangle~⦦ dzcy~џ dzigrarr~⟿ eDDot~⩷ eDot~≑ eacute~é easter~⩮ ecaron~ě ecir~≖ ecirc~ê\
  ecolon~≕ ecy~э edot~ė ee~ⅇ efDot~≒ efr~𝔢 eg~⪚ egrave~è egs~⪖ egsdot~⪘ el~⪙ elinters~⏧ ell~ℓ els~⪕ elsdot~⪗\
  emacr~ē empty~∅ emptyset~∅ emptyv~∅ emsp~  emsp13~  emsp14~  eng~ŋ ensp~  eogon~ę eopf~𝕖 epar~⋕ eparsl~⧣ eplus~⩱\
  epsi~ε epsilon~ε epsiv~ϵ eqcirc~≖ eqcolon~≕ eqsim~≂ eqslantgtr~⪖ eqslantless~⪕ equals~= equest~≟ equiv~≡ equivDD~⩸\
  eqvparsl~⧥ erDot~≓ erarr~⥱ escr~ℯ esdot~≐ esim~≂ eta~η eth~ð euml~ë euro~€ excl~! exist~∃ expectation~ℰ\
  exponentiale~ⅇ fallingdotseq~≒ fcy~ф female~♀ ffilig~ffi fflig~ff ffllig~ffl ffr~𝔣 filig~fi fjlig~fj flat~♭ fllig~fl\
  fltns~▱ fnof~ƒ fopf~𝕗 forall~∀ fork~⋔ forkv~⫙ fpartint~⨍ frac12~½ frac13~⅓ frac14~¼ frac15~⅕ frac16~⅙ frac18~⅛\
  frac23~⅔ frac25~⅖ frac34~¾ frac35~⅗ frac38~⅜ frac45~⅘ frac56~⅚ frac58~⅝ frac78~⅞ frasl~⁄ frown~⌢ fscr~𝒻 gE~≧\
  gEl~⪌ gacute~ǵ gamma~γ gammad~ϝ gap~⪆ gbreve~ğ gcirc~ĝ gcy~г gdot~ġ ge~≥ gel~⋛ geq~≥ geqq~≧ geqslant~⩾ ges~⩾\
  gescc~⪩ gesdot~⪀ gesdoto~⪂ gesdotol~⪄ gesl~⋛︀ gesles~⪔ gfr~𝔤 gg~≫ ggg~⋙ gimel~ℷ gjcy~ѓ gl~≷ glE~⪒ gla~⪥ glj~⪤\
  gnE~≩ gnap~⪊ gnapprox~⪊ gne~⪈ gneq~⪈ gneqq~≩ gnsim~⋧ gopf~𝕘 grave~` gscr~ℊ gsim~≳ gsime~⪎ gsiml~⪐ gt~> gtcc~⪧\
  gtcir~⩺ gtdot~⋗ gtlPar~⦕ gtquest~⩼ gtrapprox~⪆ gtrarr~⥸ gtrdot~⋗ gtreqless~⋛ gtreqqless~⪌ gtrless~≷ gtrsim~≳\
  gvertneqq~≩︀ gvnE~≩︀ hArr~⇔ hairsp~  half~½ hamilt~ℋ hardcy~ъ harr~↔ harrcir~⥈ harrw~↭ hbar~ℏ hcirc~ĥ hearts~♥\
  heartsuit~♥ hellip~… hercon~⊹ hfr~𝔥 hksearow~⤥ hkswarow~⤦ hoarr~⇿ homtht~∻ hookleftarrow~↩ hookrightarrow~↪\
  hopf~𝕙 horbar~― hscr~𝒽 hslash~ℏ hstrok~ħ hybull~⁃ hyphen~‐ iacute~í ic~⁣ icirc~î icy~и iecy~е iexcl~¡ iff~⇔\
  ifr~𝔦 igrave~ì ii~ⅈ iiiint~⨌ iiint~∭ iinfin~⧜ iiota~℩ ijlig~ij imacr~ī image~ℑ imagline~ℐ imagpart~ℑ imath~ı\
  imof~⊷ imped~Ƶ in~∈ incare~℅ infin~∞ infintie~⧝ inodot~ı int~∫ intcal~⊺ integers~ℤ intercal~⊺ intlarhk~⨗ intprod~⨼\
  iocy~ё iogon~į iopf~𝕚 iota~ι iprod~⨼ iquest~¿ iscr~𝒾 isin~∈ isinE~⋹ isindot~⋵ isins~⋴ isinsv~⋳ isinv~∈ it~⁢\
  itilde~ĩ iukcy~і iuml~ï jcirc~ĵ jcy~й jfr~𝔧 jmath~ȷ jopf~𝕛 jscr~𝒿 jsercy~ј jukcy~є kappa~κ kappav~ϰ kcedil~ķ\
  kcy~к kfr~𝔨 kgreen~ĸ khcy~х kjcy~ќ kopf~𝕜 kscr~𝓀 lAarr~⇚ lArr~⇐ lAtail~⤛ lBarr~⤎ lE~≦ lEg~⪋ lHar~⥢ lacute~ĺ\
  laemptyv~⦴ lagran~ℒ lambda~λ lang~⟨ langd~⦑ langle~⟨ lap~⪅ laquo~« larr~← larrb~⇤ larrbfs~⤟ larrfs~⤝ larrhk~↩\
  larrlp~↫ larrpl~⤹ larrsim~⥳ larrtl~↢ lat~⪫ latail~⤙ late~⪭ lates~⪭︀ lbarr~⤌ lbbrk~❲ lbrace~{ lbrack~[ lbrke~⦋\
  lbrksld~⦏ lbrkslu~⦍ lcaron~ľ lcedil~ļ lceil~⌈ lcub~{ lcy~л ldca~⤶ ldquo~“ ldquor~„ ldrdhar~⥧ ldrushar~⥋ ldsh~↲\
  le~≤ leftarrow~← leftarrowtail~↢ leftharpoondown~↽ leftharpoonup~↼ leftleftarrows~⇇ leftrightarrow~↔\
  leftrightarrows~⇆ leftrightharpoons~⇋ leftrightsquigarrow~↭ leftthreetimes~⋋ leg~⋚ leq~≤ leqq~≦ leqslant~⩽ les~⩽\
  lescc~⪨ lesdot~⩿ lesdoto~⪁ lesdotor~⪃ lesg~⋚︀ lesges~⪓ lessapprox~⪅ lessdot~⋖ lesseqgtr~⋚ lesseqqgtr~⪋ lessgtr~≶\
  lesssim~≲ lfisht~⥼ lfloor~⌊ lfr~𝔩 lg~≶ lgE~⪑ lhard~↽ lharu~↼ lharul~⥪ lhblk~▄ ljcy~љ ll~≪ llarr~⇇ llcorner~⌞\
  llhard~⥫ lltri~◺ lmidot~ŀ lmoust~⎰ lmoustache~⎰ lnE~≨ lnap~⪉ lnapprox~⪉ lne~⪇ lneq~⪇ lneqq~≨ lnsim~⋦ loang~⟬\
  loarr~⇽ lobrk~⟦ longleftarrow~⟵ longleftrightarrow~⟷ longmapsto~⟼ longrightarrow~⟶ looparrowleft~↫\
  looparrowright~↬ lopar~⦅ lopf~𝕝 loplus~⨭ lotimes~⨴ lowast~∗ lowbar~_ loz~◊ lozenge~◊ lozf~⧫ lpar~( lparlt~⦓\
  lrarr~⇆ lrcorner~⌟ lrhar~⇋ lrhard~⥭ lrm~‎ lrtri~⊿ lsaquo~‹ lscr~𝓁 lsh~↰ lsim~≲ lsime~⪍ lsimg~⪏ lsqb~[ lsquo~‘\
  lsquor~‚ lstrok~ł lt~< ltcc~⪦ ltcir~⩹ ltdot~⋖ lthree~⋋ ltimes~⋉ ltlarr~⥶ ltquest~⩻ ltrPar~⦖ ltri~◃ ltrie~⊴ ltrif~◂\
  lurdshar~⥊ luruhar~⥦ lvertneqq~≨︀ lvnE~≨︀ mDDot~∺ macr~¯ male~♂ malt~✠ maltese~✠ map~↦ mapsto~↦ mapstodown~↧\
  mapstoleft~↤ mapstoup~↥ marker~▮ mcomma~⨩ mcy~м mdash~— measuredangle~∡ mfr~𝔪 mho~℧ micro~µ mid~∣ midast~*\
  midcir~⫰ middot~· minus~− minusb~⊟ minusd~∸ minusdu~⨪ mlcp~⫛ mldr~… mnplus~∓ models~⊧ mopf~𝕞 mp~∓ mscr~𝓂\
  mstpos~∾ mu~μ multimap~⊸ mumap~⊸ nGg~⋙̸ nGt~≫⃒ nGtv~≫̸ nLeftarrow~⇍ nLeftrightarrow~⇎ nLl~⋘̸ nLt~≪⃒ nLtv~≪̸\
  nRightarrow~⇏ nVDash~⊯ nVdash~⊮ nabla~∇ nacute~ń nang~∠⃒ nap~≉ napE~⩰̸ napid~≋̸ napos~ʼn napprox~≉ natur~♮\
  natural~♮ naturals~ℕ nbsp~  nbump~≎̸ nbumpe~≏̸ ncap~⩃ ncaron~ň ncedil~ņ ncong~≇ ncongdot~⩭̸ ncup~⩂ ncy~н ndash~–\
  ne~≠ neArr~⇗ nearhk~⤤ nearr~↗ nearrow~↗ nedot~≐̸ nequiv~≢ nesear~⤨ nesim~≂̸ nexist~∄ nexists~∄ nfr~𝔫 ngE~≧̸ nge~≱\
  ngeq~≱ ngeqq~≧̸ ngeqslant~⩾̸ nges~⩾̸ ngsim~≵ ngt~≯ ngtr~≯ nhArr~⇎ nharr~↮ nhpar~⫲ ni~∋ nis~⋼ nisd~⋺ niv~∋ njcy~њ\
  nlArr~⇍ nlE~≦̸ nlarr~↚ nldr~‥ nle~≰ nleftarrow~↚ nleftrightarrow~↮ nleq~≰ nleqq~≦̸ nleqslant~⩽̸ nles~⩽̸ nless~≮\
  nlsim~≴ nlt~≮ nltri~⋪ nltrie~⋬ nmid~∤ nopf~𝕟 not~¬ notin~∉ notinE~⋹̸ notindot~⋵̸ notinva~∉ notinvb~⋷ notinvc~⋶\
  notni~∌ notniva~∌ notnivb~⋾ notnivc~⋽ npar~∦ nparallel~∦ nparsl~⫽⃥ npart~∂̸ npolint~⨔ npr~⊀ nprcue~⋠ npre~⪯̸\
  nprec~⊀ npreceq~⪯̸ nrArr~⇏ nrarr~↛ nrarrc~⤳̸ nrarrw~↝̸ nrightarrow~↛ nrtri~⋫ nrtrie~⋭ nsc~⊁ nsccue~⋡ nsce~⪰̸\
  nscr~𝓃 nshortmid~∤ nshortparallel~∦ nsim~≁ nsime~≄ nsimeq~≄ nsmid~∤ nspar~∦ nsqsube~⋢ nsqsupe~⋣ nsub~⊄ nsubE~⫅̸\
  nsube~⊈ nsubset~⊂⃒ nsubseteq~⊈ nsubseteqq~⫅̸ nsucc~⊁ nsucceq~⪰̸ nsup~⊅ nsupE~⫆̸ nsupe~⊉ nsupset~⊃⃒ nsupseteq~⊉\
  nsupseteqq~⫆̸ ntgl~≹ ntilde~ñ ntlg~≸ ntriangleleft~⋪ ntrianglelefteq~⋬ ntriangleright~⋫ ntrianglerighteq~⋭ nu~ν\
  num~# numero~№ numsp~  nvDash~⊭ nvHarr~⤄ nvap~≍⃒ nvdash~⊬ nvge~≥⃒ nvgt~>⃒ nvinfin~⧞ nvlArr~⤂ nvle~≤⃒ nvlt~<⃒\
  nvltrie~⊴⃒ nvrArr~⤃ nvrtrie~⊵⃒ nvsim~∼⃒ nwArr~⇖ nwarhk~⤣ nwarr~↖ nwarrow~↖ nwnear~⤧ oS~Ⓢ oacute~ó oast~⊛ ocir~⊚\
  ocirc~ô ocy~о odash~⊝ odblac~ő odiv~⨸ odot~⊙ odsold~⦼ oelig~œ ofcir~⦿ ofr~𝔬 ogon~˛ ograve~ò ogt~⧁ ohbar~⦵ ohm~Ω\
  oint~∮ olarr~↺ olcir~⦾ olcross~⦻ oline~‾ olt~⧀ omacr~ō omega~ω omicron~ο omid~⦶ ominus~⊖ oopf~𝕠 opar~⦷ operp~⦹\
  oplus~⊕ or~∨ orarr~↻ ord~⩝ order~ℴ orderof~ℴ ordf~ª ordm~º origof~⊶ oror~⩖ orslope~⩗ orv~⩛ oscr~ℴ oslash~ø osol~⊘\
  otilde~õ otimes~⊗ otimesas~⨶ ouml~ö ovbar~⌽ par~∥ para~¶ parallel~∥ parsim~⫳ parsl~⫽ part~∂ pcy~п percnt~%\
  period~. permil~‰ perp~⊥ pertenk~‱ pfr~𝔭 phi~φ phiv~ϕ phmmat~ℳ phone~☎ pi~π pitchfork~⋔ piv~ϖ planck~ℏ planckh~ℎ\
  plankv~ℏ plus~+ plusacir~⨣ plusb~⊞ pluscir~⨢ plusdo~∔ plusdu~⨥ pluse~⩲ plusmn~± plussim~⨦ plustwo~⨧ pm~±\
  pointint~⨕ popf~𝕡 pound~£ pr~≺ prE~⪳ prap~⪷ prcue~≼ pre~⪯ prec~≺ precapprox~⪷ preccurlyeq~≼ preceq~⪯\
  precnapprox~⪹ precneqq~⪵ precnsim~⋨ precsim~≾ prime~′ primes~ℙ prnE~⪵ prnap~⪹ prnsim~⋨ prod~∏ profalar~⌮\
  profline~⌒ profsurf~⌓ prop~∝ propto~∝ prsim~≾ prurel~⊰ pscr~𝓅 psi~ψ puncsp~  qfr~𝔮 qint~⨌ qopf~𝕢 qprime~⁗\
  qscr~𝓆 quaternions~ℍ quatint~⨖ quest~? questeq~≟ quot~" rAarr~⇛ rArr~⇒ rAtail~⤜ rBarr~⤏ rHar~⥤ race~∽̱ racute~ŕ\
  radic~√ raemptyv~⦳ rang~⟩ rangd~⦒ range~⦥ rangle~⟩ raquo~» rarr~→ rarrap~⥵ rarrb~⇥ rarrbfs~⤠ rarrc~⤳ rarrfs~⤞\
  rarrhk~↪ rarrlp~↬ rarrpl~⥅ rarrsim~⥴ rarrtl~↣ rarrw~↝ ratail~⤚ ratio~∶ rationals~ℚ rbarr~⤍ rbbrk~❳ rbrace~}\
  rbrack~] rbrke~⦌ rbrksld~⦎ rbrkslu~⦐ rcaron~ř rcedil~ŗ rceil~⌉ rcub~} rcy~р rdca~⤷ rdldhar~⥩ rdquo~” rdquor~”\
  rdsh~↳ real~ℜ realine~ℛ realpart~ℜ reals~ℝ rect~▭ reg~® rfisht~⥽ rfloor~⌋ rfr~𝔯 rhard~⇁ rharu~⇀ rharul~⥬ rho~ρ\
  rhov~ϱ rightarrow~→ rightarrowtail~↣ rightharpoondown~⇁ rightharpoonup~⇀ rightleftarrows~⇄ rightleftharpoons~⇌\
  rightrightarrows~⇉ rightsquigarrow~↝ rightthreetimes~⋌ ring~˚ risingdotseq~≓ rlarr~⇄ rlhar~⇌ rlm~‏ rmoust~⎱\
  rmoustache~⎱ rnmid~⫮ roang~⟭ roarr~⇾ robrk~⟧ ropar~⦆ ropf~𝕣 roplus~⨮ rotimes~⨵ rpar~) rpargt~⦔ rppolint~⨒ rrarr~⇉\
  rsaquo~› rscr~𝓇 rsh~↱ rsqb~] rsquo~’ rsquor~’ rthree~⋌ rtimes~⋊ rtri~▹ rtrie~⊵ rtrif~▸ rtriltri~⧎ ruluhar~⥨ rx~℞\
  sacute~ś sbquo~‚ sc~≻ scE~⪴ scap~⪸ scaron~š sccue~≽ sce~⪰ scedil~ş scirc~ŝ scnE~⪶ scnap~⪺ scnsim~⋩ scpolint~⨓\
  scsim~≿ scy~с sdot~⋅ sdotb~⊡ sdote~⩦ seArr~⇘ searhk~⤥ searr~↘ searrow~↘ sect~§ semi~; seswar~⤩ setminus~∖ setmn~∖\
  sext~✶ sfr~𝔰 sfrown~⌢ sharp~♯ shchcy~щ shcy~ш shortmid~∣ shortparallel~∥ shy~­ sigma~σ sigmaf~ς sigmav~ς sim~∼\
  simdot~⩪ sime~≃ simeq~≃ simg~⪞ simgE~⪠ siml~⪝ simlE~⪟ simne~≆ simplus~⨤ simrarr~⥲ slarr~← smallsetminus~∖ smashp~⨳\
  smeparsl~⧤ smid~∣ smile~⌣ smt~⪪ smte~⪬ smtes~⪬︀ softcy~ь sol~/ solb~⧄ solbar~⌿ sopf~𝕤 spades~♠ spadesuit~♠ spar~∥\
  sqcap~⊓ sqcaps~⊓︀ sqcup~⊔ sqcups~⊔︀ sqsub~⊏ sqsube~⊑ sqsubset~⊏ sqsubseteq~⊑ sqsup~⊐ sqsupe~⊒ sqsupset~⊐\
  sqsupseteq~⊒ squ~□ square~□ squarf~▪ squf~▪ srarr~→ sscr~𝓈 ssetmn~∖ ssmile~⌣ sstarf~⋆ star~☆ starf~★\
  straightepsilon~ϵ straightphi~ϕ strns~¯ sub~⊂ subE~⫅ subdot~⪽ sube~⊆ subedot~⫃ submult~⫁ subnE~⫋ subne~⊊ subplus~⪿\
  subrarr~⥹ subset~⊂ subseteq~⊆ subseteqq~⫅ subsetneq~⊊ subsetneqq~⫋ subsim~⫇ subsub~⫕ subsup~⫓ succ~≻ succapprox~⪸\
  succcurlyeq~≽ succeq~⪰ succnapprox~⪺ succneqq~⪶ succnsim~⋩ succsim~≿ sum~∑ sung~♪ sup~⊃ sup1~¹ sup2~² sup3~³\
  supE~⫆ supdot~⪾ supdsub~⫘ supe~⊇ supedot~⫄ suphsol~⟉ suphsub~⫗ suplarr~⥻ supmult~⫂ supnE~⫌ supne~⊋ supplus~⫀\
  supset~⊃ supseteq~⊇ supseteqq~⫆ supsetneq~⊋ supsetneqq~⫌ supsim~⫈ supsub~⫔ supsup~⫖ swArr~⇙ swarhk~⤦ swarr~↙\
  swarrow~↙ swnwar~⤪ szlig~ß target~⌖ tau~τ tbrk~⎴ tcaron~ť tcedil~ţ tcy~т tdot~⃛ telrec~⌕ tfr~𝔱 there4~∴\
  therefore~∴ theta~θ thetasym~ϑ thetav~ϑ thickapprox~≈ thicksim~∼ thinsp~  thkap~≈ thksim~∼ thorn~þ tilde~˜ times~×\
  timesb~⊠ timesbar~⨱ timesd~⨰ tint~∭ toea~⤨ top~⊤ topbot~⌶ topcir~⫱ topf~𝕥 topfork~⫚ tosa~⤩ tprime~‴ trade~™\
  triangle~▵ triangledown~▿ triangleleft~◃ trianglelefteq~⊴ triangleq~≜ triangleright~▹ trianglerighteq~⊵ tridot~◬\
  trie~≜ triminus~⨺ triplus~⨹ trisb~⧍ tritime~⨻ trpezium~⏢ tscr~𝓉 tscy~ц tshcy~ћ tstrok~ŧ twixt~≬\
  twoheadleftarrow~↞ twoheadrightarrow~↠ uArr~⇑ uHar~⥣ uacute~ú uarr~↑ ubrcy~ў ubreve~ŭ ucirc~û ucy~у udarr~⇅\
  udblac~ű udhar~⥮ ufisht~⥾ ufr~𝔲 ugrave~ù uharl~↿ uharr~↾ uhblk~▀ ulcorn~⌜ ulcorner~⌜ ulcrop~⌏ ultri~◸ umacr~ū\
  uml~¨ uogon~ų uopf~𝕦 uparrow~↑ updownarrow~↕ upharpoonleft~↿ upharpoonright~↾ uplus~⊎ upsi~υ upsih~ϒ upsilon~υ\
  upuparrows~⇈ urcorn~⌝ urcorner~⌝ urcrop~⌎ uring~ů urtri~◹ uscr~𝓊 utdot~⋰ utilde~ũ utri~▵ utrif~▴ uuarr~⇈ uuml~ü\
  uwangle~⦧ vArr~⇕ vBar~⫨ vBarv~⫩ vDash~⊨ vangrt~⦜ varepsilon~ϵ varkappa~ϰ varnothing~∅ varphi~ϕ varpi~ϖ varpropto~∝\
  varr~↕ varrho~ϱ varsigma~ς varsubsetneq~⊊︀ varsubsetneqq~⫋︀ varsupsetneq~⊋︀ varsupsetneqq~⫌︀ vartheta~ϑ\
  vartriangleleft~⊲ vartriangleright~⊳ vcy~в vdash~⊢ vee~∨ veebar~⊻ veeeq~≚ vellip~⋮ verbar~| vert~| vfr~𝔳 vltri~⊲\
  vnsub~⊂⃒ vnsup~⊃⃒ vopf~𝕧 vprop~∝ vrtri~⊳ vscr~𝓋 vsubnE~⫋︀ vsubne~⊊︀ vsupnE~⫌︀ vsupne~⊋︀ vzigzag~⦚ wcirc~ŵ\
  wedbar~⩟ wedge~∧ wedgeq~≙ weierp~℘ wfr~𝔴 wopf~𝕨 wp~℘ wr~≀ wreath~≀ wscr~𝓌 xcap~⋂ xcirc~◯ xcup~⋃ xdtri~▽ xfr~𝔵\
  xhArr~⟺ xharr~⟷ xi~ξ xlArr~⟸ xlarr~⟵ xmap~⟼ xnis~⋻ xodot~⨀ xopf~𝕩 xoplus~⨁ xotime~⨂ xrArr~⟹ xrarr~⟶ xscr~𝓍\
  xsqcup~⨆ xuplus~⨄ xutri~△ xvee~⋁ xwedge~⋀ yacute~ý yacy~я ycirc~ŷ ycy~ы yen~¥ yfr~𝔶 yicy~ї yopf~𝕪 yscr~𝓎 yucy~ю\
  yuml~ÿ zacute~ź zcaron~ž zcy~з zdot~ż zeetrf~ℨ zeta~ζ zfr~𝔷 zhcy~ж zigrarr~⇝ zopf~𝕫 zscr~𝓏 zwj~‍ zwnj~‌'

const namedReferences = new Map(packedReferences.split(/ +/).map(namedReference))

export function holdsEntityReference(text: string): boolean {
  for (let index = text.indexOf('&'); index !== -1; index = text.indexOf('&', index + 1)) {
    if (readEntityReference(text, index) !== undefined) return true
  }
  return false
}

// The reference standing at `index`, `undefined` where none does.
export function readEntityReference(text: string, index: number): EntityReference | undefined {
  anchoredEntityReference.lastIndex = index
  const reference = anchoredEntityReference.exec(text)?.[0]
  if (reference === undefined) return undefined
  const decoded = decodeReference(reference)
  return decoded === undefined ? undefined : { length: reference.length, text: decoded }
}

function decodeReference(reference: string): string | undefined {
  const decimal = decimalReference.exec(reference)?.[1]
  if (decimal !== undefined) return characterOf(Number.parseInt(decimal, 10))
  const hexadecimal = hexadecimalReference.exec(reference)?.[1]
  if (hexadecimal !== undefined) return characterOf(Number.parseInt(hexadecimal, 16))
  return namedReferences.get(reference.slice(1, -1))
}

function characterOf(codePoint: number): string {
  if (codePoint === 0 || codePoint > largestCodePoint) return replacementCharacter
  if (codePoint >= surrogates.first && codePoint <= surrogates.last) return replacementCharacter
  return String.fromCodePoint(codePoint)
}

function namedReference(entry: string): [string, string] {
  const separator = entry.indexOf('~')
  return [entry.slice(0, separator), entry.slice(separator + 1)]
}