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regexp.bnf
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regexp.bnf
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/**
* BNF grammar for Regular Expressions.
*
* Based on RegExp grammar from ECMAScript:
* http://www.ecma-international.org/ecma-262/7.0/#sec-patterns
*
* Parser generated by Syntax tool (npm: syntax-cli)
*
* Dmitry Soshnikov <[email protected]>
*
* MIT Style License.
*/
// --------------------------------------------
// 1. Lexical grammar.
%lex
CHAR [^*?+\[()\\|]
ESC \\
U [0-9a-fA-F]
U_LEAD_SURROGATE [dD][89abAB][0-9a-fA-F]{2}
U_TRAIL_SURROGATE [dD][c-fC-F][0-9a-fA-F]{2}
/**
* Generated by scripts/generate-unicode-id-parts.js on node v10.16.0 with unicode 12.1
* based on http://www.unicode.org/reports/tr31/ and https://www.ecma-international.org/ecma-262/6.0/#sec-names-and-keywords
* U_ID_START corresponds to the ID_Start property, and U_ID_CONTINUE corresponds to ID_Continue property
*/
U_ID_START 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U_ID_CONTINUE 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-\ufefc\uff10-\uff19\uff21-\uff3a\uff3f\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]|\ud800[\udc00-\udc0b\udc0d-\udc26\udc28-\udc3a\udc3c-\udc3d\udc3f-\udc4d\udc50-\udc5d\udc80-\udcfa\udd40-\udd74\uddfd\ude80-\ude9c\udea0-\uded0\udee0\udf00-\udf1f\udf2d-\udf4a\udf50-\udf7a\udf80-\udf9d\udfa0-\udfc3\udfc8-\udfcf\udfd1-\udfd5]|\ud801[\udc00-\udc9d\udca0-\udca9\udcb0-\udcd3\udcd8-\udcfb\udd00-\udd27\udd30-\udd63\ude00-\udf36\udf40-\udf55\udf60-\udf67]|\ud802[\udc00-\udc05\udc08\udc0a-\udc35\udc37-\udc38\udc3c\udc3f-\udc55\udc60-\udc76\udc80-\udc9e\udce0-\udcf2\udcf4-\udcf5\udd00-\udd15\udd20-\udd39\udd80-\uddb7\uddbe-\uddbf\ude00-\ude03\ude05-\ude06\ude0c-\ude13\ude15-\ude17\ude19-\ude35\ude38-\ude3a\ude3f\ude60-\ude7c\ude80-\ude9c\udec0-\udec7\udec9-\udee6\udf00-\udf35\udf40-\udf55\udf60-\udf72\udf80-\udf91]|\ud803[\udc00-\udc48\udc80-\udcb2\udcc0-\udcf2\udd00-\udd27\udd30-\udd39\udf00-\udf1c\udf27\udf30-\udf50\udfe0-\udff6]|\ud804[\udc00-\udc46\udc66-\udc6f\udc7f-\udcba\udcd0-\udce8\udcf0-\udcf9\udd00-\udd34\udd36-\udd3f\udd44-\udd46\udd50-\udd73\udd76\udd80-\uddc4\uddc9-\uddcc\uddd0-\uddda\udddc\ude00-\ude11\ude13-\ude37\ude3e\ude80-\ude86\ude88\ude8a-\ude8d\ude8f-\ude9d\ude9f-\udea8\udeb0-\udeea\udef0-\udef9\udf00-\udf03\udf05-\udf0c\udf0f-\udf10\udf13-\udf28\udf2a-\udf30\udf32-\udf33\udf35-\udf39\udf3b-\udf44\udf47-\udf48\udf4b-\udf4d\udf50\udf57\udf5d-\udf63\udf66-\udf6c\udf70-\udf74]|\ud805[\udc00-\udc4a\udc50-\udc59\udc5e-\udc5f\udc80-\udcc5\udcc7\udcd0-\udcd9\udd80-\uddb5\uddb8-\uddc0\uddd8-\udddd\ude00-\ude40\ude44\ude50-\ude59\ude80-\udeb8\udec0-\udec9\udf00-\udf1a\udf1d-\udf2b\udf30-\udf39]|\ud806[\udc00-\udc3a\udca0-\udce9\udcff\udda0-\udda7\uddaa-\uddd7\uddda-\udde1\udde3-\udde4\ude00-\ude3e\ude47\ude50-\ude99\ude9d\udec0-\udef8]|\ud807[\udc00-\udc08\udc0a-\udc36\udc38-\udc40\udc50-\udc59\udc72-\udc8f\udc92-\udca7\udca9-\udcb6\udd00-\udd06\udd08-\udd09\udd0b-\udd36\udd3a\udd3c-\udd3d\udd3f-\udd47\udd50-\udd59\udd60-\udd65\udd67-\udd68\udd6a-\udd8e\udd90-\udd91\udd93-\udd98\udda0-\udda9\udee0-\udef6]|\ud808[\udc00-\udf99]|\ud809[\udc00-\udc6e\udc80-\udd43]|\ud80c[\udc00-\udfff]|\ud80d[\udc00-\udc2e]|\ud811[\udc00-\ude46]|\ud81a[\udc00-\ude38\ude40-\ude5e\ude60-\ude69\uded0-\udeed\udef0-\udef4\udf00-\udf36\udf40-\udf43\udf50-\udf59\udf63-\udf77\udf7d-\udf8f]|\ud81b[\ude40-\ude7f\udf00-\udf4a\udf4f-\udf87\udf8f-\udf9f\udfe0-\udfe1\udfe3]|\ud81c[\udc00-\udfff]|\ud81d[\udc00-\udfff]|\ud81e[\udc00-\udfff]|\ud81f[\udc00-\udfff]|\ud820[\udc00-\udfff]|\ud821[\udc00-\udff7]|\ud822[\udc00-\udef2]|\ud82c[\udc00-\udd1e\udd50-\udd52\udd64-\udd67\udd70-\udefb]|\ud82f[\udc00-\udc6a\udc70-\udc7c\udc80-\udc88\udc90-\udc99\udc9d-\udc9e]|\ud834[\udd65-\udd69\udd6d-\udd72\udd7b-\udd82\udd85-\udd8b\uddaa-\uddad\ude42-\ude44]|\ud835[\udc00-\udc54\udc56-\udc9c\udc9e-\udc9f\udca2\udca5-\udca6\udca9-\udcac\udcae-\udcb9\udcbb\udcbd-\udcc3\udcc5-\udd05\udd07-\udd0a\udd0d-\udd14\udd16-\udd1c\udd1e-\udd39\udd3b-\udd3e\udd40-\udd44\udd46\udd4a-\udd50\udd52-\udea5\udea8-\udec0\udec2-\udeda\udedc-\udefa\udefc-\udf14\udf16-\udf34\udf36-\udf4e\udf50-\udf6e\udf70-\udf88\udf8a-\udfa8\udfaa-\udfc2\udfc4-\udfcb\udfce-\udfff]|\ud836[\ude00-\ude36\ude3b-\ude6c\ude75\ude84\ude9b-\ude9f\udea1-\udeaf]|\ud838[\udc00-\udc06\udc08-\udc18\udc1b-\udc21\udc23-\udc24\udc26-\udc2a\udd00-\udd2c\udd30-\udd3d\udd40-\udd49\udd4e\udec0-\udef9]|\ud83a[\udc00-\udcc4\udcd0-\udcd6\udd00-\udd4b\udd50-\udd59]|\ud83b[\ude00-\ude03\ude05-\ude1f\ude21-\ude22\ude24\ude27\ude29-\ude32\ude34-\ude37\ude39\ude3b\ude42\ude47\ude49\ude4b\ude4d-\ude4f\ude51-\ude52\ude54\ude57\ude59\ude5b\ude5d\ude5f\ude61-\ude62\ude64\ude67-\ude6a\ude6c-\ude72\ude74-\ude77\ude79-\ude7c\ude7e\ude80-\ude89\ude8b-\ude9b\udea1-\udea3\udea5-\udea9\udeab-\udebb]|\ud840[\udc00-\udfff]|\ud841[\udc00-\udfff]|\ud842[\udc00-\udfff]|\ud843[\udc00-\udfff]|\ud844[\udc00-\udfff]|\ud845[\udc00-\udfff]|\ud846[\udc00-\udfff]|\ud847[\udc00-\udfff]|\ud848[\udc00-\udfff]|\ud849[\udc00-\udfff]|\ud84a[\udc00-\udfff]|\ud84b[\udc00-\udfff]|\ud84c[\udc00-\udfff]|\ud84d[\udc00-\udfff]|\ud84e[\udc00-\udfff]|\ud84f[\udc00-\udfff]|\ud850[\udc00-\udfff]|\ud851[\udc00-\udfff]|\ud852[\udc00-\udfff]|\ud853[\udc00-\udfff]|\ud854[\udc00-\udfff]|\ud855[\udc00-\udfff]|\ud856[\udc00-\udfff]|\ud857[\udc00-\udfff]|\ud858[\udc00-\udfff]|\ud859[\udc00-\udfff]|\ud85a[\udc00-\udfff]|\ud85b[\udc00-\udfff]|\ud85c[\udc00-\udfff]|\ud85d[\udc00-\udfff]|\ud85e[\udc00-\udfff]|\ud85f[\udc00-\udfff]|\ud860[\udc00-\udfff]|\ud861[\udc00-\udfff]|\ud862[\udc00-\udfff]|\ud863[\udc00-\udfff]|\ud864[\udc00-\udfff]|\ud865[\udc00-\udfff]|\ud866[\udc00-\udfff]|\ud867[\udc00-\udfff]|\ud868[\udc00-\udfff]|\ud869[\udc00-\uded6\udf00-\udfff]|\ud86a[\udc00-\udfff]|\ud86b[\udc00-\udfff]|\ud86c[\udc00-\udfff]|\ud86d[\udc00-\udf34\udf40-\udfff]|\ud86e[\udc00-\udc1d\udc20-\udfff]|\ud86f[\udc00-\udfff]|\ud870[\udc00-\udfff]|\ud871[\udc00-\udfff]|\ud872[\udc00-\udfff]|\ud873[\udc00-\udea1\udeb0-\udfff]|\ud874[\udc00-\udfff]|\ud875[\udc00-\udfff]|\ud876[\udc00-\udfff]|\ud877[\udc00-\udfff]|\ud878[\udc00-\udfff]|\ud879[\udc00-\udfff]|\ud87a[\udc00-\udfe0]|\ud87e[\udc00-\ude1d]|\udb40[\udd00-\uddef])
ESC_SEQ (\\'u'[0-9a-fA-F]{4}|\\'u{'[0-9a-fA-F]{1,}'}')
ID_START ({U_ID_START}|[$_]|{ESC_SEQ})
ID_CONTINUE ({U_ID_CONTINUE}|[$_]|{ESC_SEQ}|[\u200c\u200d])
GROUP_NAME {ID_START}{ID_CONTINUE}*
NAME \w+
/**
* Lexer state for character class.
*
* Some meta symbols inside a character class are treated as simple
* symbols, so we return different token types for them.
*
* E.g. `(` yields L_PAREN token by default, however in a character
* class it's a simple symbol:
*
* '(' return 'L_PAREN'
* <class>'(' return 'CHAR'
*
* This allows making BNF grammar simpler with less productions, and states.
*
* <u_class> is the same but with unicode flag.
*/
%s class
%s u_class
/**
* State for "extended" regexp, enabled by `x` flag.
*
* In this state whitespace are ignored, and expressions can
* use #-comments.
*
* <xu> is the same but with unicode flag.
*/
%s x
%s xu
/**
* State for "unicode" regexp, enabled by `u` flag.
*
* In this state surrogate pairs are treated as codepoints and
* \u{} syntax is understood.
*/
%s u
%%
<x,xu>'#'[^\n]+ /* skip comments */
<x,xu>\s+ /* skip whitespace */
<class,u_class>'-' return 'DASH'
<class,u_class>'/' return 'CHAR'
<class,u_class>'#' return 'CHAR'
<class,u_class>'|' return 'CHAR'
<class,u_class>'.' return 'CHAR'
<class,u_class>'{' return 'CHAR'
'{'\d+'}' return 'RANGE_EXACT'
'{'\d+',}' return 'RANGE_OPEN'
'{'\d+','\d+'}' return 'RANGE_CLOSED'
{ESC}'k<'{GROUP_NAME}'>' {
const groupName = yytext.slice(3, -1);
validateUnicodeGroupName(groupName, this.getCurrentState());
return 'NAMED_GROUP_REF';
}
{ESC}'b' return 'ESC_b'
{ESC}'B' return 'ESC_B'
{ESC}'c'[a-zA-Z] return 'CTRL_CH'
{ESC}'0'\d{1,2} return 'OCT_CODE'
{ESC}'0' return 'DEC_CODE'
{ESC}\d{1,3} return 'DEC_CODE'
<u,xu,u_class>{ESC}'u'{U_LEAD_SURROGATE}{ESC}'u'{U_TRAIL_SURROGATE} return 'U_CODE_SURROGATE'
<u,xu,u_class>{ESC}'u{'{U}{1,}'}' return 'U_CODE'
{ESC}'u'{U}{4} return 'U_CODE'
<u,xu,u_class>{ESC}[pP]'{'{NAME}(?:\={NAME})?'}' return 'U_PROP_VALUE_EXP'
{ESC}'x'{U}{2} return 'HEX_CODE'
{ESC}[tnrdDsSwWvf] return 'META_CHAR'
{ESC}'/' return 'ESC_CHAR'
<xu>{ESC}[ #] return 'ESC_CHAR'
{ESC}[\^\$\.\*\+\?\(\)\\\[\]\{\}\|\/] return 'ESC_CHAR'
{ESC}{CHAR} {
const s = this.getCurrentState();
if (s === 'u_class' && yytext === "\\-") {
return 'ESC_CHAR';
}
else if (s === 'u' || s === 'xu' || s === 'u_class') {
throw new SyntaxError(`invalid Unicode escape ${yytext}`);
}
return 'ESC_CHAR';
}
<class,u_class>'(' return 'CHAR'
<class,u_class>')' return 'CHAR'
'(?=' return 'POS_LA_ASSERT'
'(?!' return 'NEG_LA_ASSERT'
'(?<=' return 'POS_LB_ASSERT'
'(?<!' return 'NEG_LB_ASSERT'
'(?:' return 'NON_CAPTURE_GROUP'
'(?<'{GROUP_NAME}'>' {
yytext = yytext.slice(3, -1);
validateUnicodeGroupName(yytext, this.getCurrentState());
return 'NAMED_CAPTURE_GROUP';
}
'(' return 'L_PAREN'
')' return 'R_PAREN'
<class,u_class>[*?+[^$] return 'CHAR'
<class,u_class>{ESC}']' return 'ESC_CHAR'
<class,u_class>']' { this.popState(); return 'R_BRACKET' }
'^' return 'BOS'
'$' return 'EOS'
'*' return 'STAR'
'?' return 'Q_MARK'
'+' return 'PLUS'
'|' return 'BAR'
'.' return 'ANY'
'/' return 'SLASH'
{CHAR} return 'CHAR'
'[^' { const s = this.getCurrentState(); this.pushState(s === 'u' || s === 'xu' ? 'u_class' : 'class'); return 'NEG_CLASS' }
'[' { const s = this.getCurrentState(); this.pushState(s === 'u' || s === 'xu' ? 'u_class' : 'class'); return 'L_BRACKET' }
/lex
// --------------------------------------------
// 2. Syntactic grammar.
%{
/**
* Tracks capturing groups.
*/
let capturingGroupsCount = 0;
/**
* Tracks named groups.
*/
let namedGroups = {};
/**
* Parsing string.
*/
let parsingString = '';
yyparse.onParseBegin = (string, lexer) => {
parsingString = string;
capturingGroupsCount = 0;
namedGroups = {};
const lastSlash = string.lastIndexOf('/');
const flags = string.slice(lastSlash);
if (flags.includes('x') && flags.includes('u')) {
lexer.pushState('xu');
} else {
if (flags.includes('x')) {
lexer.pushState('x');
}
if (flags.includes('u')) {
lexer.pushState('u');
}
}
};
/**
* On shifting `(` remember its number to used on reduce.
*/
yyparse.onShift = token => {
if (token.type === 'L_PAREN' || token.type === 'NAMED_CAPTURE_GROUP') {
token.value = new String(token.value);
token.value.groupNumber = ++capturingGroupsCount;
}
return token;
};
/**
* Extracts ranges from the range string.
*/
function getRange(text) {
const range = text.match(/\d+/g).map(Number);
if (Number.isFinite(range[1]) && range[1] < range[0]) {
throw new SyntaxError(`Numbers out of order in ${text} quantifier`);
}
return range;
}
/**
* Checks class range
*/
function checkClassRange(from, to) {
if (from.kind === 'control' || to.kind === 'control' || (!isNaN(from.codePoint) && !isNaN(to.codePoint) && from.codePoint > to.codePoint)) {
throw new SyntaxError(`Range ${from.value}-${to.value} out of order in character class`);
}
}
// ---------------------- Unicode property -------------------------------------------
const unicodeProperties = require('../unicode/parser-unicode-properties.js');
/**
* Unicode property.
*/
function UnicodeProperty(matched, loc) {
const negative = matched[1] === 'P';
const separatorIdx = matched.indexOf('=');
let name = matched.slice(3, separatorIdx !== -1 ? separatorIdx : -1);
let value;
// General_Category allows using only value as a shorthand.
const isShorthand = separatorIdx === -1 &&
unicodeProperties.isGeneralCategoryValue(name);
// Binary propery name.
const isBinaryProperty = separatorIdx === -1 &&
unicodeProperties.isBinaryPropertyName(name);
if (isShorthand) {
value = name;
name = 'General_Category';
} else if (isBinaryProperty) {
value = name;
} else {
if (!unicodeProperties.isValidName(name)) {
throw new SyntaxError(`Invalid unicode property name: ${name}.`);
}
value = matched.slice(separatorIdx + 1, -1);
if (!unicodeProperties.isValidValue(name, value)) {
throw new SyntaxError(`Invalid ${name} unicode property value: ${value}.`);
}
}
return Node({
type: 'UnicodeProperty',
name,
value,
negative,
shorthand: isShorthand,
binary: isBinaryProperty,
canonicalName: unicodeProperties.getCanonicalName(name) || name,
canonicalValue: unicodeProperties.getCanonicalValue(value) || value,
}, loc);
}
// ----------------------------------------------------------------------------------
/**
* Creates a character node.
*/
function Char(value, kind, loc) {
let symbol;
let codePoint;
switch (kind) {
case 'decimal': {
codePoint = Number(value.slice(1));
symbol = String.fromCodePoint(codePoint);
break;
}
case 'oct': {
codePoint = parseInt(value.slice(1), 8);
symbol = String.fromCodePoint(codePoint);
break;
}
case 'hex':
case 'unicode': {
if (value.lastIndexOf('\\u') > 0) {
let [lead, trail] = value.split('\\u').slice(1);
lead = parseInt(lead, 16);
trail = parseInt(trail, 16);
codePoint = (lead - 0xd800) * 0x400 + (trail - 0xdc00) + 0x10000;
symbol = String.fromCodePoint(codePoint);
} else {
const hex = value.slice(2).replace('{', '');
codePoint = parseInt(hex, 16);
if (codePoint > 0x10ffff) {
throw new SyntaxError(`Bad character escape sequence: ${value}`);
}
symbol = String.fromCodePoint(codePoint);
}
break;
}
case 'meta': {
switch (value) {
case '\\t':
symbol = '\t';
codePoint = symbol.codePointAt(0);
break;
case '\\n':
symbol = '\n';
codePoint = symbol.codePointAt(0);
break;
case '\\r':
symbol = '\r';
codePoint = symbol.codePointAt(0);
break;
case '\\v':
symbol = '\v';
codePoint = symbol.codePointAt(0);
break;
case '\\f':
symbol = '\f';
codePoint = symbol.codePointAt(0);
break;
case '\\b':
symbol = '\b';
codePoint = symbol.codePointAt(0);
case '\\0':
symbol = '\0';
codePoint = 0;
case '.':
symbol = '.';
codePoint = NaN;
break;
default:
codePoint = NaN;
}
break;
}
case 'simple': {
symbol = value;
codePoint = symbol.codePointAt(0);
break;
}
}
return Node({
type: 'Char',
value,
kind,
symbol,
codePoint,
}, loc);
}
/**
* Valid flags per current ECMAScript spec and
* stage 3+ proposals.
*/
const validFlags = 'gimsuxyd';
/**
* Checks the flags are valid, and that
* we don't duplicate flags.
*/
function checkFlags(flags) {
const seen = new Set();
for (const flag of flags) {
if (seen.has(flag) || !validFlags.includes(flag)) {
throw new SyntaxError(`Invalid flags: ${flags}`);
}
seen.add(flag);
}
return flags.split('').sort().join('');
}
/**
* Parses patterns like \1, \2, etc. either as a backreference
* to a group, or a deciaml char code.
*/
function GroupRefOrDecChar(text, textLoc) {
const reference = Number(text.slice(1));
if (reference > 0 && reference <= capturingGroupsCount) {
return Node({
type: 'Backreference',
kind: 'number',
number: reference,
reference,
}, textLoc);
}
return Char(text, 'decimal', textLoc);
}
/**
* Unicode names.
*/
const uReStart = /^\\u[0-9a-fA-F]{4}/; // only matches start of string
const ucpReStart = /^\\u\{[0-9a-fA-F]{1,}\}/; // only matches start of string
const ucpReAnywhere = /\\u\{[0-9a-fA-F]{1,}\}/; // matches anywhere in string
/**
* Validates Unicode group name.
*/
function validateUnicodeGroupName(name, state) {
const isUnicodeName = ucpReAnywhere.test(name);
const isUnicodeState = (state === 'u' || state === 'xu' || state === 'u_class');
if (isUnicodeName && !isUnicodeState) {
throw new SyntaxError(`invalid group Unicode name "${name}", use \`u\` flag.`);
}
return name;
}
// Matches the following production: https://tc39.es/ecma262/#prod-RegExpUnicodeEscapeSequence
//
// RegExpUnicodeEscapeSequence ::
// `u` LeadSurrogate `\u` TrailSurrogate # as 'leadSurrogate', 'trailSurrogate'
// `u` LeadSurrogate # as 'leadSurrogateOnly'
// `u` TrailSurrogate # as 'trailSurrogateOnly'
// `u` NonSurrogate # as 'nonSurrogate'
// `u` `{` CodePoint `}` # as 'codePoint'
//
// LeadSurrogate ::
// Hex4Digits but only if the SV of Hex4Digits is in the inclusive range 0xD800 to 0xDBFF # [dD][89aAbB][0-9a-fA-F]{2}
//
// TrailSurrogate ::
// Hex4Digits but only if the SV of Hex4Digits is in the inclusive range 0xDC00 to 0xDFFF # [dD][c-fC-F][0-9a-fA-F]{2}
//
// NonSurrogate ::
// Hex4Digits but only if the SV of Hex4Digits is not in the inclusive range 0xD800 to 0xDFFF # [0-9a-ce-fA-CE-F][0-9a-fA-F]{3}|[dD][0-7][0-9a-fA-F]{2}
//
// CodePoint ::
// HexDigits but only if MV of HexDigits ≤ 0x10FFFF # 0*(?:[0-9a-fA-F]{1,5}|10[0-9a-fA-F]{4})
//
const uidRe = /\\u(?:([dD][89aAbB][0-9a-fA-F]{2})\\u([dD][c-fC-F][0-9a-fA-F]{2})|([dD][89aAbB][0-9a-fA-F]{2})|([dD][c-fC-F][0-9a-fA-F]{2})|([0-9a-ce-fA-CE-F][0-9a-fA-F]{3}|[dD][0-7][0-9a-fA-F]{2})|\{(0*(?:[0-9a-fA-F]{1,5}|10[0-9a-fA-F]{4}))\})/;
function decodeUnicodeGroupName(name) {
return name.replace(new RegExp(uidRe, 'g'), function (_, leadSurrogate, trailSurrogate, leadSurrogateOnly, trailSurrogateOnly, nonSurrogate, codePoint) {
if (leadSurrogate) {
return String.fromCodePoint(parseInt(leadSurrogate, 16), parseInt(trailSurrogate, 16));
}
if (leadSurrogateOnly) {
return String.fromCodePoint(parseInt(leadSurrogateOnly, 16));
}
if (trailSurrogateOnly) {
// TODO: Per the spec: https://tc39.es/ecma262/#prod-RegExpUnicodeEscapeSequence
// > 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.
return String.fromCodePoint(parseInt(trailSurrogateOnly, 16));
}
if (nonSurrogate) {
return String.fromCodePoint(parseInt(nonSurrogate, 16));
}
if (codePoint) {
return String.fromCodePoint(parseInt(codePoint, 16));
}
return _;
});
}
/**
* Extracts from `\k<foo>` pattern either a backreference
* to a named capturing group (if it presents), or parses it
* as a list of char: `\k`, `<`, `f`, etc.
*/
function NamedGroupRefOrChars(text, textLoc) {
const referenceRaw = text.slice(3, -1);
const reference = decodeUnicodeGroupName(referenceRaw);
if (namedGroups.hasOwnProperty(reference)) {
return Node({
type: 'Backreference',
kind: 'name',
number: namedGroups[reference],
reference,
referenceRaw,
}, textLoc);
}
// Else `\k<foo>` should be parsed as a list of `Char`s.
// This is really a 0.01% edge case, but we should handle it.
let startOffset = null;
let startLine = null;
let endLine = null;
let startColumn = null;
if (textLoc) {
startOffset = textLoc.startOffset;
startLine = textLoc.startLine;
endLine = textLoc.endLine;
startColumn = textLoc.startColumn;
}
const charRe = /^[\w$<>]/;
let loc;
const chars = [
// Init to first \k, taking 2 symbols.
Char(
text.slice(1, 2),
'simple',
startOffset
? {
startLine,
endLine,
startColumn,
startOffset,
endOffset: startOffset += 2,
endColumn: startColumn += 2,
}
: null
),
];
// For \k
chars[0].escaped = true;
// Other symbols.
text = text.slice(2);
while (text.length > 0) {
let matched = null;
// Unicode, \u003B or \u{003B}
if ((matched = text.match(uReStart)) || (matched = text.match(ucpReStart))) {
if (startOffset) {
loc = {
startLine,
endLine,
startColumn,
startOffset,
endOffset: (startOffset += matched[0].length),
endColumn: (startColumn += matched[0].length),
};
}
chars.push(Char(matched[0], 'unicode', loc));
text = text.slice(matched[0].length);
}
// Simple char.
else if ((matched = text.match(charRe))) {
if (startOffset) {
loc = {
startLine,
endLine,
startColumn,
startOffset,
endOffset: ++startOffset,
endColumn: ++startColumn,
};
}
chars.push(Char(matched[0], 'simple', loc));
text = text.slice(1);
}
}
return chars;
}
/**
* Creates an AST node with a location.
*/
function Node(node, loc) {
if (yy.options.captureLocations) {
node.loc = {
source: parsingString.slice(loc.startOffset, loc.endOffset),
start: {
line: loc.startLine,
column: loc.startColumn,
offset: loc.startOffset,
},
end: {
line: loc.endLine,
column: loc.endColumn,
offset: loc.endOffset,
},
};
}
return node;
}
/**
* Creates location node.
*/
function loc(start, end) {
if (!yy.options.captureLocations) {
return null;
}
return {
startOffset: start.startOffset,
endOffset: end.endOffset,
startLine: start.startLine,
endLine: end.endLine,
startColumn: start.startColumn,
endColumn: end.endColumn,
};
}
%}
%%
RegExp
: SLASH Pattern SLASH OptFlags
{
$$ = Node({
type: 'RegExp',
body: $2,
flags: checkFlags($4),
}, loc(@1, @4 || @3))
}
;
OptFlags
: Flags
| /* empty */ { $$ = '' }
;
Flags
: CHAR
| Flags CHAR { $$ = $1 + $2 }
;
Pattern
: Disjunction
;
Disjunction
: Alternative
| Disjunction BAR Alternative
{
// Location for empty disjunction: /|/
let _loc = null;
if (@2) {
_loc = loc(@1 || @2, @3 || @2);
};
$$ = Node({
type: 'Disjunction',
left: $1,
right: $3,
}, _loc)
}
;
Alternative
: AlternativeEntries
{
if ($1.length === 0) {
$$ = null;
return;
}
if ($1.length === 1) {
$$ = Node($1[0], @$);
} else {
$$ = Node({
type: 'Alternative',
expressions: $1,
}, @$)
}
}
;
AlternativeEntries
: /* empty */
{ $$ = [] }
| AlternativeEntries Term
{ $$ = $1.concat($2) }
;
Term
: Assertion
{ $$ = Node(Object.assign({type: 'Assertion'}, $1), @$) }
| Atom OptQuantifier
{
$$ = $1;
if ($2) {
$$ = Node({
type: 'Repetition',
expression: $1,
quantifier: $2,
}, @$)
}
}
;
Assertion
: BOS { $$ = { kind: '^' } }
| EOS { $$ = { kind: '$' } }
| ESC_b { $$ = { kind: '\\b' } }
| ESC_B { $$ = { kind: '\\B' } }
| POS_LA_ASSERT Disjunction R_PAREN
{
$$ = {
kind: 'Lookahead',
assertion: $2,
}
}
| NEG_LA_ASSERT Disjunction R_PAREN
{
$$ = {
kind: 'Lookahead',
negative: true,
assertion: $2,
}
}
| POS_LB_ASSERT Disjunction R_PAREN
{
$$ = {
kind: 'Lookbehind',
assertion: $2,
}
}
| NEG_LB_ASSERT Disjunction R_PAREN
{
$$ = {
kind: 'Lookbehind',
negative: true,
assertion: $2,
}
}
;
Atom
: SourceCharacter
| CharacterClass
| Group
;
SourceCharacter
: CHAR
{ $$ = Char($1, 'simple', @$) }
| ESC_CHAR
{ $$ = Char($1.slice(1), 'simple', @$); $$.escaped = true; }
| U_CODE_SURROGATE
{ $$ = Char($1, 'unicode', @$); $$.isSurrogatePair = true; }
| U_CODE
{ $$ = Char($1, 'unicode', @$) }
| U_PROP_VALUE_EXP
{ $$ = UnicodeProperty($1, @$) }
| CTRL_CH
{ $$ = Char($1, 'control', @$) }
| HEX_CODE
{ $$ = Char($1, 'hex', @$) }
| OCT_CODE
{ $$ = Char($1, 'oct', @$) }
| DEC_CODE
{ $$ = GroupRefOrDecChar($1, @$) }
| META_CHAR
{ $$ = Char($1, 'meta', @$) }
| ANY
{ $$ = Char($1, 'meta', @$) }
| NAMED_GROUP_REF
{ $$ = NamedGroupRefOrChars($1, @1) }
;
OptQuantifier
: Quantifier
| /* empty */
;
Quantifier
: QuantifierPrefix
| QuantifierPrefix Q_MARK
{
$1.greedy = false;
$$ = $1;
}
;
QuantifierPrefix
: STAR
{
$$ = Node({
type: 'Quantifier',
kind: $1,
greedy: true,
}, @$)
}
| PLUS
{
$$ = Node({
type: 'Quantifier',
kind: $1,
greedy: true,
}, @$)
}
| Q_MARK
{
$$ = Node({
type: 'Quantifier',
kind: $1,
greedy: true,
}, @$)
}
| RANGE_EXACT
{
const range = getRange($1);
$$ = Node({
type: 'Quantifier',
kind: 'Range',
from: range[0],
to: range[0],
greedy: true,
}, @$)
}
| RANGE_OPEN
{
$$ = Node({
type: 'Quantifier',
kind: 'Range',
from: getRange($1)[0],
greedy: true,
}, @$)
}
| RANGE_CLOSED
{
const range = getRange($1);
$$ = Node({
type: 'Quantifier',
kind: 'Range',
from: range[0],
to: range[1],
greedy: true,
}, @$)
}
;
Group
: CapturingGroup
| NonCapturingGroup
;
CapturingGroup
: NAMED_CAPTURE_GROUP Disjunction R_PAREN
{
const nameRaw = String($1);
const name = decodeUnicodeGroupName(nameRaw);
if (!yy.options.allowGroupNameDuplicates && namedGroups.hasOwnProperty(name)) {
throw new SyntaxError(`Duplicate of the named group "${name}".`);
}
namedGroups[name] = $1.groupNumber;
$$ = Node({
type: 'Group',
capturing: true,
name,
nameRaw,
number: $1.groupNumber,
expression: $2,
}, @$);
}
| L_PAREN Disjunction R_PAREN
{
$$ = Node({
type: 'Group',
capturing: true,
number: $1.groupNumber,
expression: $2,
}, @$);
}
;
NonCapturingGroup
: NON_CAPTURE_GROUP Disjunction R_PAREN
{
$$ = Node({
type: 'Group',
capturing: false,
expression: $2,
}, @$)
}
;
CharacterClass
: NEG_CLASS ClassRanges R_BRACKET
{
$$ = Node({
type: 'CharacterClass',
negative: true,
expressions: $2,
}, @$)
}
| L_BRACKET ClassRanges R_BRACKET
{
$$ = Node({
type: 'CharacterClass',
expressions: $2,
}, @$)
}
;
ClassRanges
: /* empty */
{ $$ = [] }
| NonemptyClassRanges
;
NonemptyClassRanges
: ClassAtom
{ $$ = [$1] }
| ClassAtom NonemptyClassRangesNoDash
{ $$ = [$1].concat($2) }
| ClassAtom DASH ClassAtom ClassRanges
{
checkClassRange($1, $3);
$$ = [
Node({
type: 'ClassRange',
from: $1,
to: $3,
}, loc(@1, @3))
];