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ecma2020regex.cf
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--------------------------------------------------------------------------------
-- BNF Grammar of ECMAScript 2020
-- https://www.ecma-international.org/ecma-262/#sec-regexp-regular-expression-objects
--------------------------------------------------------------------------------
-- Entry point
-- Pattern ::=
-- Disjunction
-- Disjunction ::=
-- Alternative
-- Alternative|Disjunction
Pattern. PatternC ::= [AlternativeC];
-- Alternative::
-- [empty]
-- Alternative Term
Alternative. AlternativeC ::= [TermC];
separator nonempty AlternativeC "|";
-- Term::
-- Assertion
-- Atom
-- Atom Quantifier
AssertionTerm. TermC ::= AssertionC;
AtomTerm. TermC ::= AtomC;
AtomQuanTerm. TermC ::= AtomC QuantifierC;
separator TermC "";
-- Assertion::
-- ^
-- $
-- \b
-- \B
-- (?=Disjunction)
-- (?!Disjunction)
-- (?<=Disjunction)
-- (?<!Disjunction)
BegAnchor. AssertionC ::= "^";
EndAnchor. AssertionC ::= "$";
WordAnchor. AssertionC ::= "\\" "b";
NonWordAnchor. AssertionC ::= "\\" "B";
PosLookahead. AssertionC ::= "(" "?" "=" [AlternativeC] ")";
NegLookahead. AssertionC ::= "(" "?" "!" [AlternativeC] ")";
PosLookbehind. AssertionC ::= "(" "?" "<" "=" [AlternativeC] ")";
NegLookbehind. AssertionC ::= "(" "?" "<" "!" [AlternativeC] ")";
-- Quantifier::
-- QuantifierPrefix
-- QuantifierPrefix ?
Quantifier. QuantifierC ::= QuantifierPrefixC;
QuantifierNonGreedy. QuantifierC ::= QuantifierPrefixC "?";
-- QuantifierPrefix::
-- *
-- +
-- ?
-- {DecimalDigits}
-- {DecimalDigits,}
-- {DecimalDigits,DecimalDigits}
StarQuantifier. QuantifierPrefixC ::= "*";
PlusQuantifier. QuantifierPrefixC ::= "+";
OptQuantifier. QuantifierPrefixC ::= "?";
Loop1Quantifier. QuantifierPrefixC ::= "{" [DecimalDigit] "}";
Loop2Quantifier. QuantifierPrefixC ::= "{" [DecimalDigit] "," "}";
Loop3Quantifier. QuantifierPrefixC ::= "{" [DecimalDigit] "," [DecimalDigit] "}";
-- Atom::
-- PatternCharacter
-- .
-- \AtomEscape
-- CharacterClass[?U]
-- (GroupSpecifier[?U]Disjunction)
-- (?:Disjunction)
PatternCharAtom.AtomC ::= PatternCharacter;
DotAtom. AtomC ::= ".";
EscapeAtom. AtomC ::= "\\" AtomEscapeC;
CharClassAtom. AtomC ::= CharacterClassC;
GroupAtom. AtomC ::= "(" GroupSpecifierC [AlternativeC] ")";
NonCaptGroup. AtomC ::= "(" "?" ":" [AlternativeC] ")";
-- SyntaxCharacter::one of
-- ^$\.*+?()[]{}|
-- PatternCharacter::
-- SourceCharacter but not SyntaxCharacter
-- ControlEscape::one of
-- fnrtv
-- ControlLetter::one of
-- abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
-- Different character types; those are kept disjoint to avoid scanning problems
SyntaxCharacter1. SyntaxCharacter ::= "^";
SyntaxCharacter2. SyntaxCharacter ::= "\\";
SyntaxCharacter3. SyntaxCharacter ::= "]";
SyntaxCharacter4. SyntaxCharacter ::= SyntaxCharacterSub;
SyntaxCharacterSub1. SyntaxCharacterSub ::= "$";
SyntaxCharacterSub2. SyntaxCharacterSub ::= ".";
SyntaxCharacterSub3. SyntaxCharacterSub ::= "*";
SyntaxCharacterSub4. SyntaxCharacterSub ::= "+";
SyntaxCharacterSub5. SyntaxCharacterSub ::= "?";
SyntaxCharacterSub6. SyntaxCharacterSub ::= "(";
SyntaxCharacterSub7. SyntaxCharacterSub ::= ")";
SyntaxCharacterSub8. SyntaxCharacterSub ::= "[";
SyntaxCharacterSub9. SyntaxCharacterSub ::= "{";
SyntaxCharacterSub10. SyntaxCharacterSub ::= "}";
SyntaxCharacterSub11. SyntaxCharacterSub ::= "|";
NormalCharPat. PatternCharacter ::= NormalChar;
DecimalDigitPat. PatternCharacter ::= DecimalDigit;
DashPat. PatternCharacter ::= "-";
ControlEscapeF. ControlEscape ::= "f";
ControlEscapeN. ControlEscape ::= "n";
ControlEscapeR. ControlEscape ::= "r";
ControlEscapeT. ControlEscape ::= "t";
ControlEscapeV. ControlEscape ::= "v";
ControlLettera. ControlLetter ::= "a";
ControlLetterb. ControlLetter ::= "b";
ControlLetterc. ControlLetter ::= "c";
ControlLetterd. ControlLetter ::= "d";
ControlLettere. ControlLetter ::= "e";
ControlLetterf. ControlLetter ::= "f";
ControlLetterg. ControlLetter ::= "g";
ControlLetterh. ControlLetter ::= "h";
ControlLetteri. ControlLetter ::= "i";
ControlLetterj. ControlLetter ::= "j";
ControlLetterk. ControlLetter ::= "k";
ControlLetterl. ControlLetter ::= "l";
ControlLetterm. ControlLetter ::= "m";
ControlLettern. ControlLetter ::= "n";
ControlLettero. ControlLetter ::= "o";
ControlLetterp. ControlLetter ::= "p";
ControlLetterq. ControlLetter ::= "q";
ControlLetterr. ControlLetter ::= "r";
ControlLetters. ControlLetter ::= "s";
ControlLettert. ControlLetter ::= "t";
ControlLetteru. ControlLetter ::= "u";
ControlLetterv. ControlLetter ::= "v";
ControlLetterw. ControlLetter ::= "w";
ControlLetterx. ControlLetter ::= "x";
ControlLettery. ControlLetter ::= "y";
ControlLetterz. ControlLetter ::= "z";
ControlLetterA. ControlLetter ::= "A";
ControlLetterB. ControlLetter ::= "B";
ControlLetterC. ControlLetter ::= "C";
ControlLetterD. ControlLetter ::= "D";
ControlLetterE. ControlLetter ::= "E";
ControlLetterF. ControlLetter ::= "F";
ControlLetterG. ControlLetter ::= "G";
ControlLetterH. ControlLetter ::= "H";
ControlLetterI. ControlLetter ::= "I";
ControlLetterJ. ControlLetter ::= "J";
ControlLetterK. ControlLetter ::= "K";
ControlLetterL. ControlLetter ::= "L";
ControlLetterM. ControlLetter ::= "M";
ControlLetterN. ControlLetter ::= "N";
ControlLetterO. ControlLetter ::= "O";
ControlLetterP. ControlLetter ::= "P";
ControlLetterQ. ControlLetter ::= "Q";
ControlLetterR. ControlLetter ::= "R";
ControlLetterS. ControlLetter ::= "S";
ControlLetterT. ControlLetter ::= "T";
ControlLetterU. ControlLetter ::= "U";
ControlLetterV. ControlLetter ::= "V";
ControlLetterW. ControlLetter ::= "W";
ControlLetterX. ControlLetter ::= "X";
ControlLetterY. ControlLetter ::= "Y";
ControlLetterZ. ControlLetter ::= "Z";
token SpecialNormalChar (char - ["@<>=-^$/\\.,:*+?!()[]{}|_0123456789a-zA-Z"]);
ControlLetterNormalChar. NormalChar ::= ControlLetter;
SpecialLetterNormalChar. NormalChar ::= SpecialNormalChar;
ExtraLetterNormalChar. NormalChar ::= ExtraNormalChar;
UnderscoreNormalChar. NormalChar ::= "_";
NormalChar1. ExtraNormalChar ::= ",";
NormalChar2. ExtraNormalChar ::= "<";
NormalChar3. ExtraNormalChar ::= ">";
NormalChar4. ExtraNormalChar ::= "=";
NormalChar5. ExtraNormalChar ::= "!";
NormalChar6. ExtraNormalChar ::= "@";
NormalChar7. ExtraNormalChar ::= ":";
NormalChar8. ExtraNormalChar ::= "/";
DecimalDigit0. DecimalDigit ::= "0";
PositiveDec. DecimalDigit ::= PositiveDecimal;
DecimalDigit1. PositiveDecimal ::= "1";
DecimalDigit2. PositiveDecimal ::= "2";
DecimalDigit3. PositiveDecimal ::= "3";
DecimalDigit4. PositiveDecimal ::= "4";
DecimalDigit5. PositiveDecimal ::= "5";
DecimalDigit6. PositiveDecimal ::= "6";
DecimalDigit7. PositiveDecimal ::= "7";
DecimalDigit8. PositiveDecimal ::= "8";
DecimalDigit9. PositiveDecimal ::= "9";
separator nonempty DecimalDigit "";
NoDecimalDigits. MaybeDecimalDigits ::= ;
SomeDecimalDigits. MaybeDecimalDigits ::= [DecimalDigit];
HexDigitDec. HexDigit ::= DecimalDigit;
HexDigita. HexDigit ::= "a";
HexDigitb. HexDigit ::= "b";
HexDigitc. HexDigit ::= "c";
HexDigitd. HexDigit ::= "d";
HexDigite. HexDigit ::= "e";
HexDigitf. HexDigit ::= "f";
HexDigitA. HexDigit ::= "A";
HexDigitB. HexDigit ::= "B";
HexDigitC. HexDigit ::= "C";
HexDigitD. HexDigit ::= "D";
HexDigitE. HexDigit ::= "E";
HexDigitF. HexDigit ::= "F";
separator nonempty HexDigit "";
OctalDigit0. OctalDigit ::= "0";
OctalDigit1. OctalDigit ::= "1";
OctalDigit2. OctalDigit ::= "2";
OctalDigit3. OctalDigit ::= "3";
OctalDigit4. OctalDigit ::= "4";
OctalDigit5. OctalDigit ::= "5";
OctalDigit6. OctalDigit ::= "6";
OctalDigit7. OctalDigit ::= "7";
-- AtomEscape::
-- DecimalEscape
-- CharacterClassEscape[?U]
-- CharacterEscape[?U]
-- [+N]kGroupName[?U]
-- We include the case of octal escapes, starting with 0 in the
-- DecAtomEscape case
DecAtomEscape. AtomEscapeC ::= DecimalDigit MaybeDecimalDigits;
CCAtomEscape. AtomEscapeC ::= CharacterClassEscapeC;
CharAtomEscape. AtomEscapeC ::= CharacterEscapeC;
-- CharacterEscape[U]::
-- ControlEscape
-- c ControlLetter
-- 0[lookahead ∉ DecimalDigit]
-- HexEscapeSequence
-- RegExpUnicodeEscapeSequence[?U]
-- IdentityEscape[?U]
ControlCharEscape. CharacterEscapeC ::= ControlEscape;
LetterCharEscape. CharacterEscapeC ::= "c" ControlLetter;
HexCharEscape. CharacterEscapeC ::= HexEscapeSequenceC;
RegExpUnicodeEscape. CharacterEscapeC ::= RegExpUnicodeEscapeSequenceC;
IdentityEscape. CharacterEscapeC ::= IdentityEscapeC;
-- The null character escape is included in the DecAtomEscape and
-- OctClassEscape productions
--
-- NullCharEscape. CharacterEscapeC ::= "0";
-- HexEscapeSequence::
-- x HexDigit HexDigit
HexEscapeSequence. HexEscapeSequenceC ::= "x" HexDigit HexDigit;
-- GroupSpecifier[U]::
-- [empty]
-- ? GroupName[?U]
NoGroupSpecifier. GroupSpecifierC ::= ;
GroupSpecifier. GroupSpecifierC ::= "?" "<" ">"; -- GroupNameC;
-- GroupName[U]::
-- <RegExpIdentifierName[?U]>
-- RegExpIdentifierName[U]::
-- RegExpIdentifierStart[?U]
-- RegExpIdentifierName[?U]RegExpIdentifierPart[?U]
-- RegExpIdentifierStart[U]::
-- UnicodeIDStart
-- $
-- _
-- \RegExpUnicodeEscapeSequence[+U]
-- [~U]UnicodeLeadSurrogateUnicodeTrailSurrogate
-- RegExpIdentifierPart[U]::
-- UnicodeIDContinue
-- $
-- \RegExpUnicodeEscapeSequence[+U]
-- [~U]UnicodeLeadSurrogateUnicodeTrailSurrogate
-- <ZWNJ>
-- <ZWJ>
-- RegExpUnicodeEscapeSequence[U]::
-- [+U]uLeadSurrogate\uTrailSurrogate
-- [+U]uLeadSurrogate
-- [+U]uTrailSurrogate
-- [+U]uNonSurrogate
-- [~U]uHex4Digits
-- [+U]u{CodePoint}
Hex4UniEscapeSequence. RegExpUnicodeEscapeSequenceC ::=
"u" HexDigit HexDigit HexDigit HexDigit;
CodepointUniEscapeSequence. RegExpUnicodeEscapeSequenceC ::=
"u" "{" [HexDigit] "}";
-- UnicodeLeadSurrogate::
-- anyUnicodecodepointintheinclusiverange
-- UnicodeTrailSurrogate
-- anyUnicodecodepointintheinclusiverange
--
-- Each \u TrailSurrogate for which the choice of associated u LeadSurrogate is ambiguous shall be associated with the nearest possible u LeadSurrogate that would otherwise have no corresponding \u TrailSurrogate.
-- LeadSurrogate::
-- Hex4Digitsbut only if the SV of Hex4Digits is in the inclusive range 0xD800 to 0xDBFF
-- TrailSurrogate::
-- Hex4Digitsbut only if the SV of Hex4Digits is in the inclusive range 0xDC00 to 0xDFFF
-- NonSurrogate::
-- Hex4Digitsbut only if the SV of Hex4Digits is not in the inclusive range 0xD800 to 0xDFFF
-- IdentityEscape[U]::
-- [+U]SyntaxCharacter
-- [+U]/
-- [~U]SourceCharacterbut not UnicodeIDContinue
SyntaxIdentifyEscape. IdentityEscapeC ::= SyntaxCharacter;
NormalCharIdentifyEscape. IdentityEscapeC ::= ExtraNormalChar;
SpecialNormalIdentityEscape. IdentityEscapeC ::= SpecialNormalChar;
UnderscoreIdentityEscape. IdentityEscapeC ::= "_";
DashIdentityEscape. IdentityEscapeC ::= "-";
-- DecimalDigitIdentifyEscape. IdentityEscapeC ::= DecimalDigit;
-- DecimalEscape::
-- NonZeroDigitDecimalDigitsopt[lookahead ∉ DecimalDigit]
-- CharacterClassEscape[U]::
-- d
-- D
-- s
-- S
-- w
-- W
-- [+U]p{UnicodePropertyValueExpression}
-- [+U]P{UnicodePropertyValueExpression}
CharacterClassEscaped. CharacterClassEscapeC ::= "d";
CharacterClassEscapeD. CharacterClassEscapeC ::= "D";
CharacterClassEscapes. CharacterClassEscapeC ::= "s";
CharacterClassEscapeS. CharacterClassEscapeC ::= "S";
CharacterClassEscapew. CharacterClassEscapeC ::= "w";
CharacterClassEscapeW. CharacterClassEscapeC ::= "W";
CharacterClassEscapep. CharacterClassEscapeC ::= "p" "{" UnicodePropertyValueExpressionC "}";
CharacterClassEscapeP. CharacterClassEscapeC ::= "P" "{" UnicodePropertyValueExpressionC "}";
UPropNameValue. UnicodePropertyValueExpressionC ::= [UnicodePropCharacter];
UnicodePropControlLetter. UnicodePropCharacter ::= ControlLetter;
UnicodePropDecimalDigit. UnicodePropCharacter ::= DecimalDigit;
UnicodePropUnderscore. UnicodePropCharacter ::= "_";
UnicodePropEquals. UnicodePropCharacter ::= "=";
separator nonempty UnicodePropCharacter "";
-- CharacterClass[U]::
-- [[lookahead ≠ ^]ClassRanges[?U]]
-- [^ClassRanges[?U]]
PosClass. CharacterClassC ::= "[" ClassRangesNoNegC "]";
NegClass. CharacterClassC ::= "[" "^" ClassRangesC "]";
-- ClassRanges[U]::
-- [empty]
-- NonemptyClassRanges[?U]
EmptyRange. ClassRangesC ::= ;
NonEmptyRange. ClassRangesC ::= NEClassRangesC;
-- Ranges that do not start with a ^ character
EmptyRangeNN. ClassRangesNoNegC ::= ;
NonEmptyRangeNN.ClassRangesNoNegC ::= NEClassRangesNoNegC;
-- NonemptyClassRanges[U]::
-- ClassAtom[?U]
-- ClassAtom[?U] NonemptyClassRangesNoDash[?U]
-- ClassAtom[?U] - ClassAtom[?U] ClassRanges[?U]
-- NonemptyClassRangesNoDash[U]::
-- ClassAtom[?U]
-- ClassAtomNoDash[?U]NonemptyClassRangesNoDash[?U]
-- ClassAtomNoDash[?U]-ClassAtom[?U]ClassRanges[?U]
ClassChar. NEClassRangesC ::= ClassAtomC;
ClassCont. NEClassRangesC ::= ClassAtomC NEClassRangesNoDashC;
ClassCharRange. NEClassRangesC ::= ClassAtomC "-" ClassAtomC
ClassRangesC;
-- Ranges that do not start with a ^ character
ClassCharNN. NEClassRangesNoNegC ::= ClassAtomNoNegC;
ClassContNN. NEClassRangesNoNegC ::= ClassAtomNoNegC
NEClassRangesNoDashC;
ClassCharRangeNN. NEClassRangesNoNegC ::= ClassAtomNoNegC "-" ClassAtomC
ClassRangesC;
-- Ranges that do not start with a - character
ClassCharND. NEClassRangesNoDashC ::= ClassAtomC;
ClassContND. NEClassRangesNoDashC ::= ClassAtomNoDashC
NEClassRangesNoDashC;
ClassCharRangeND. NEClassRangesNoDashC ::= ClassAtomNoDashC "-"
ClassAtomC ClassRangesC;
-- ClassAtom[U]::
-- -
-- ClassAtomNoDash[?U]
-- ClassAtomNoDash[U]::
-- SourceCharacter but not one of \ or ] or -
-- \ClassEscape[?U]
DashAtom. ClassAtomC ::= "-";
NegAtom. ClassAtomC ::= "^";
NoDashAtom. ClassAtomC ::= ClassAtomNoDashNegC;
NegAtomND. ClassAtomNoDashC ::= "^";
NoDashAtomND. ClassAtomNoDashC ::= ClassAtomNoDashNegC;
DashAtomNN. ClassAtomNoNegC ::= "-";
NoDashAtomNN. ClassAtomNoNegC ::= ClassAtomNoDashNegC;
-- We also exclude ^, which is handled separately
ClassAtomNoDashNeg1. ClassAtomNoDashNegC ::= NormalChar;
ClassAtomNoDashNeg2. ClassAtomNoDashNegC ::= DecimalDigit;
ClassAtomNoDashNeg3. ClassAtomNoDashNegC ::= SyntaxCharacterSub;
ClassAtomNoDashNeg4. ClassAtomNoDashNegC ::= "\\" ClassEscapeC;
-- ClassEscape[U]::
-- b
-- [+U]-
-- CharacterClassEscape[?U]
-- CharacterEscape[?U]
BClassEscape. ClassEscapeC ::= "b";
CCEClassEscape. ClassEscapeC ::= CharacterClassEscapeC;
CEClassEscapeCE. ClassEscapeC ::= CharacterEscapeC;
-- Already handled in CharacterEscapeC
-- DashClassEscape. ClassEscapeC ::= "-";
-- An as extension, we also handle octal escape strings within character classes
--
-- TODO: octal sequences should only be accepted for the range [0, 255]
--
OctClassEscape1. ClassEscapeC ::= OctalDigit;
OctClassEscape2. ClassEscapeC ::= OctalDigit OctalDigit;
OctClassEscape3. ClassEscapeC ::= OctalDigit OctalDigit OctalDigit;