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regexp-tree.js
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/**
* LR parser generated by the Syntax tool.
*
* https://www.npmjs.com/package/syntax-cli
*
* npm install -g syntax-cli
*
* syntax-cli --help
*
* To regenerate run:
*
* syntax-cli \
* --grammar ~/path-to-grammar-file \
* --mode <parsing-mode> \
* --output ~/path-to-output-parser-file.js
*/
'use strict';
/**
* Matched token text.
*/
let yytext;
/**
* Length of the matched token text.
*/
let yyleng;
/**
* Storage object.
*/
let yy = {};
/**
* Result of semantic action.
*/
let __;
/**
* Result location object.
*/
let __loc;
function yyloc(start, end) {
if (!yy.options.captureLocations) {
return null;
}
// Epsilon doesn't produce location.
if (!start || !end) {
return start || end;
}
return {
startOffset: start.startOffset,
endOffset: end.endOffset,
startLine: start.startLine,
endLine: end.endLine,
startColumn: start.startColumn,
endColumn: end.endColumn,
};
}
const EOF = '$';
/**
* List of productions (generated by Syntax tool).
*/
const productions = [[-1,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[0,4,(_1,_2,_3,_4,_1loc,_2loc,_3loc,_4loc) => { __loc = yyloc(_1loc, _4loc);
__ = Node({
type: 'RegExp',
body: _2,
flags: checkFlags(_4),
}, loc(_1loc, _4loc || _3loc))
}],
[1,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[1,0,() => { __loc = null; __ = '' }],
[2,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[2,2,(_1,_2,_1loc,_2loc) => { __loc = yyloc(_1loc, _2loc); __ = _1 + _2 }],
[3,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[4,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[4,3,(_1,_2,_3,_1loc,_2loc,_3loc) => { __loc = yyloc(_1loc, _3loc);
// Location for empty disjunction: /|/
let _loc = null;
if (_2loc) {
_loc = loc(_1loc || _2loc, _3loc || _2loc);
};
__ = Node({
type: 'Disjunction',
left: _1,
right: _3,
}, _loc)
}],
[5,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);
if (_1.length === 0) {
__ = null;
return;
}
if (_1.length === 1) {
__ = Node(_1[0], __loc);
} else {
__ = Node({
type: 'Alternative',
expressions: _1,
}, __loc)
}
}],
[6,0,() => { __loc = null; __ = [] }],
[6,2,(_1,_2,_1loc,_2loc) => { __loc = yyloc(_1loc, _2loc); __ = _1.concat(_2) }],
[7,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Node(Object.assign({type: 'Assertion'}, _1), __loc) }],
[7,2,(_1,_2,_1loc,_2loc) => { __loc = yyloc(_1loc, _2loc);
__ = _1;
if (_2) {
__ = Node({
type: 'Repetition',
expression: _1,
quantifier: _2,
}, __loc)
}
}],
[8,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = { kind: '^' } }],
[8,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = { kind: '$' } }],
[8,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = { kind: '\\b' } }],
[8,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = { kind: '\\B' } }],
[8,3,(_1,_2,_3,_1loc,_2loc,_3loc) => { __loc = yyloc(_1loc, _3loc);
__ = {
kind: 'Lookahead',
assertion: _2,
}
}],
[8,3,(_1,_2,_3,_1loc,_2loc,_3loc) => { __loc = yyloc(_1loc, _3loc);
__ = {
kind: 'Lookahead',
negative: true,
assertion: _2,
}
}],
[8,3,(_1,_2,_3,_1loc,_2loc,_3loc) => { __loc = yyloc(_1loc, _3loc);
__ = {
kind: 'Lookbehind',
assertion: _2,
}
}],
[8,3,(_1,_2,_3,_1loc,_2loc,_3loc) => { __loc = yyloc(_1loc, _3loc);
__ = {
kind: 'Lookbehind',
negative: true,
assertion: _2,
}
}],
[9,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[9,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[9,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1, 'simple', __loc) }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1.slice(1), 'simple', __loc); __.escaped = true; }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1, 'unicode', __loc); __.isSurrogatePair = true; }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1, 'unicode', __loc) }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1, 'control', __loc) }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1, 'hex', __loc) }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1, 'oct', __loc) }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = GroupRefOrDecChar(_1, __loc) }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1, 'meta', __loc) }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1, 'meta', __loc) }],
[10,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = NamedGroupRefOrChars(_1, _1loc) }],
[11,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[11,0],
[12,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[12,2,(_1,_2,_1loc,_2loc) => { __loc = yyloc(_1loc, _2loc);
_1.greedy = false;
__ = _1;
}],
[13,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);
__ = Node({
type: 'Quantifier',
kind: _1,
greedy: true,
}, __loc)
}],
[13,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);
__ = Node({
type: 'Quantifier',
kind: _1,
greedy: true,
}, __loc)
}],
[13,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);
__ = Node({
type: 'Quantifier',
kind: _1,
greedy: true,
}, __loc)
}],
[13,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);
const range = getRange(_1);
__ = Node({
type: 'Quantifier',
kind: 'Range',
from: range[0],
to: range[0],
greedy: true,
}, __loc)
}],
[13,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);
__ = Node({
type: 'Quantifier',
kind: 'Range',
from: getRange(_1)[0],
greedy: true,
}, __loc)
}],
[13,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);
const range = getRange(_1);
__ = Node({
type: 'Quantifier',
kind: 'Range',
from: range[0],
to: range[1],
greedy: true,
}, __loc)
}],
[14,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[14,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[15,3,(_1,_2,_3,_1loc,_2loc,_3loc) => { __loc = yyloc(_1loc, _3loc);
if (namedGroups.hasOwnProperty(_1)) {
throw new SyntaxError(`Duplicate of the named group "${_1}".`);
}
namedGroups[_1] = currentCapturingGroup;
__ = Node({
type: 'Group',
capturing: true,
name: _1,
number: currentCapturingGroup,
expression: _2,
}, __loc);
updateCapturingGroupTracking();
}],
[15,3,(_1,_2,_3,_1loc,_2loc,_3loc) => { __loc = yyloc(_1loc, _3loc);
__ = Node({
type: 'Group',
capturing: true,
number: currentCapturingGroup,
expression: _2,
}, __loc);
updateCapturingGroupTracking();
}],
[16,3,(_1,_2,_3,_1loc,_2loc,_3loc) => { __loc = yyloc(_1loc, _3loc);
__ = Node({
type: 'Group',
capturing: false,
expression: _2,
}, __loc)
}],
[17,3,(_1,_2,_3,_1loc,_2loc,_3loc) => { __loc = yyloc(_1loc, _3loc);
__ = Node({
type: 'CharacterClass',
negative: true,
expressions: _2,
}, __loc)
}],
[17,3,(_1,_2,_3,_1loc,_2loc,_3loc) => { __loc = yyloc(_1loc, _3loc);
__ = Node({
type: 'CharacterClass',
expressions: _2,
}, __loc)
}],
[18,0,() => { __loc = null; __ = [] }],
[18,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[19,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = [_1] }],
[19,2,(_1,_2,_1loc,_2loc) => { __loc = yyloc(_1loc, _2loc); __ = [_1].concat(_2) }],
[19,4,(_1,_2,_3,_4,_1loc,_2loc,_3loc,_4loc) => { __loc = yyloc(_1loc, _4loc);
checkClassRange(_1, _3);
__ = [
Node({
type: 'ClassRange',
from: _1,
to: _3,
}, loc(_1loc, _3loc))
];
if (_4) {
__ = __.concat(_4);
}
}],
[20,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[20,2,(_1,_2,_1loc,_2loc) => { __loc = yyloc(_1loc, _2loc); __ = [_1].concat(_2) }],
[20,4,(_1,_2,_3,_4,_1loc,_2loc,_3loc,_4loc) => { __loc = yyloc(_1loc, _4loc);
checkClassRange(_1, _3);
__ = [
Node({
type: 'ClassRange',
from: _1,
to: _3,
}, loc(_1loc, _3loc)),
];
if (_4) {
__ = __.concat(_4);
}
}],
[21,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1, 'simple', __loc) }],
[21,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[22,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc);__ = _1 }],
[22,1,(_1,_1loc) => { __loc = yyloc(_1loc, _1loc); __ = Char(_1, 'meta', __loc) }]];
/**
* Encoded tokens map.
*/
const tokens = {"SLASH":"23","CHAR":"24","BAR":"25","BOS":"26","EOS":"27","ESC_b":"28","ESC_B":"29","POS_LA_ASSERT":"30","R_PAREN":"31","NEG_LA_ASSERT":"32","POS_LB_ASSERT":"33","NEG_LB_ASSERT":"34","ESC_CHAR":"35","U_CODE_SURROGATE":"36","U_CODE":"37","CTRL_CH":"38","HEX_CODE":"39","OCT_CODE":"40","DEC_CODE":"41","META_CHAR":"42","ANY":"43","NAMED_GROUP_REF":"44","Q_MARK":"45","STAR":"46","PLUS":"47","RANGE_EXACT":"48","RANGE_OPEN":"49","RANGE_CLOSED":"50","NAMED_CAPTURE_GROUP":"51","L_PAREN":"52","NON_CAPTURE_GROUP":"53","NEG_CLASS":"54","R_BRACKET":"55","L_BRACKET":"56","DASH":"57","$":"58"};
/**
* Parsing table (generated by Syntax tool).
*/
const table = 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/**
* Parsing stack.
*/
const stack = [];
/**
* Tokenizer instance.
*/
let tokenizer;
/**
* Generic tokenizer used by the parser in the Syntax tool.
*
* https://www.npmjs.com/package/syntax-cli
*
* See `--custom-tokinzer` to skip this generation, and use a custom one.
*/
const lexRules = [[/^#[^\n]*(?=\n|\/\w*)/, function() { /* skip comments */ }],
[/^\s+/, function() { /* skip whitespace */ }],
[/^\\-/, function() { return 'ESC_CHAR' }],
[/^-/, function() { return 'DASH' }],
[/^\//, function() { return 'CHAR' }],
[/^#/, function() { return 'CHAR' }],
[/^\|/, function() { return 'CHAR' }],
[/^\./, function() { return 'CHAR' }],
[/^\{/, function() { return 'CHAR' }],
[/^\{\d+\}/, function() { return 'RANGE_EXACT' }],
[/^\{\d+,\}/, function() { return 'RANGE_OPEN' }],
[/^\{\d+,\d+\}/, function() { return 'RANGE_CLOSED' }],
[/^\\k<([\w$]|\\u[0-9a-fA-F]{4}|\\u\{[0-9a-fA-F]{1,}\})+>/, function() {
const groupName = yytext.slice(3, -1);
validateUnicodeGroupName(groupName, this.getCurrentState());
return 'NAMED_GROUP_REF';
}],
[/^\\b/, function() { return 'ESC_b' }],
[/^\\B/, function() { return 'ESC_B' }],
[/^\\c[a-zA-Z]/, function() { return 'CTRL_CH' }],
[/^\\0\d{1,2}/, function() { return 'OCT_CODE' }],
[/^\\0/, function() { return 'DEC_CODE' }],
[/^\\\d{1,3}/, function() { return 'DEC_CODE' }],
[/^\\u[dD][89abAB][0-9a-fA-F]{2}\\u[dD][c-fC-F][0-9a-fA-F]{2}/, function() { return 'U_CODE_SURROGATE' }],
[/^\\u\{[0-9a-fA-F]{1,}\}/, function() { return 'U_CODE' }],
[/^\\u[0-9a-fA-F]{4}/, function() { return 'U_CODE' }],
[/^\\x[0-9a-fA-F]{2}/, function() { return 'HEX_CODE' }],
[/^\\[tnrdDsSwWvf]/, function() { return 'META_CHAR' }],
[/^\\\//, function() { return 'ESC_CHAR' }],
[/^\\[ #]/, function() { return 'ESC_CHAR' }],
[/^\\[^*?+\[()\\|]/, function() {
const s = this.getCurrentState();
if (s === 'u' || s === 'xu' || s === 'u_class') {
throw new SyntaxError(`invalid Unicode escape ${yytext}`);
}
return 'ESC_CHAR';
}],
[/^\\[*?+\[()\\|]/, function() { return 'ESC_CHAR' }],
[/^\(/, function() { return 'CHAR' }],
[/^\)/, function() { return 'CHAR' }],
[/^\(\?=/, function() { return 'POS_LA_ASSERT' }],
[/^\(\?!/, function() { return 'NEG_LA_ASSERT' }],
[/^\(\?<=/, function() { return 'POS_LB_ASSERT' }],
[/^\(\?<!/, function() { return 'NEG_LB_ASSERT' }],
[/^\(\?:/, function() { return 'NON_CAPTURE_GROUP' }],
[/^\(\?<([\w$]|\\u[0-9a-fA-F]{4}|\\u\{[0-9a-fA-F]{1,}\})+>/, function() {
yytext = yytext.slice(3, -1);
validateUnicodeGroupName(yytext, this.getCurrentState());
return 'NAMED_CAPTURE_GROUP';
}],
[/^\(/, function() { return 'L_PAREN' }],
[/^\)/, function() { return 'R_PAREN' }],
[/^[*?+[^$]/, function() { return 'CHAR' }],
[/^\\\]/, function() { return 'ESC_CHAR' }],
[/^\]/, function() { this.popState(); return 'R_BRACKET' }],
[/^\^/, function() { return 'BOS' }],
[/^\$/, function() { return 'EOS' }],
[/^\*/, function() { return 'STAR' }],
[/^\?/, function() { return 'Q_MARK' }],
[/^\+/, function() { return 'PLUS' }],
[/^\|/, function() { return 'BAR' }],
[/^\./, function() { return 'ANY' }],
[/^\//, function() { return 'SLASH' }],
[/^[^*?+\[()\\|]/, function() { return 'CHAR' }],
[/^\[\^/, function() { const s = this.getCurrentState(); this.pushState(s === 'u' || s === 'xu' ? 'u_class' : 'class'); return 'NEG_CLASS' }],
[/^\[/, function() { const s = this.getCurrentState(); this.pushState(s === 'u' || s === 'xu' ? 'u_class' : 'class'); return 'L_BRACKET' }]];
const lexRulesByConditions = {"INITIAL":[9,10,11,12,13,14,15,16,17,18,21,22,23,24,26,27,30,31,32,33,34,35,36,37,41,42,43,44,45,46,47,48,49,50,51],"u":[9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,26,27,30,31,32,33,34,35,36,37,41,42,43,44,45,46,47,48,49,50,51],"xu":[0,1,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,30,31,32,33,34,35,36,37,41,42,43,44,45,46,47,48,49,50,51],"x":[0,1,9,10,11,12,13,14,15,16,17,18,21,22,23,24,26,27,30,31,32,33,34,35,36,37,41,42,43,44,45,46,47,48,49,50,51],"u_class":[2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51],"class":[2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,21,22,23,24,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51]};
const EOF_TOKEN = {
type: EOF,
value: '',
};
tokenizer = {
initString(string) {
this._string = string;
this._cursor = 0;
this._states = ['INITIAL'];
this._tokensQueue = [];
this._currentLine = 1;
this._currentColumn = 0;
this._currentLineBeginOffset = 0;
/**
* Matched token location data.
*/
this._tokenStartOffset = 0;
this._tokenEndOffset = 0;
this._tokenStartLine = 1;
this._tokenEndLine = 1;
this._tokenStartColumn = 0;
this._tokenEndColumn = 0;
return this;
},
/**
* Returns tokenizer states.
*/
getStates() {
return this._states;
},
getCurrentState() {
return this._states[this._states.length - 1];
},
pushState(state) {
this._states.push(state);
},
begin(state) {
this.pushState(state);
},
popState() {
if (this._states.length > 1) {
return this._states.pop();
}
return this._states[0];
},
getNextToken() {
// Something was queued, return it.
if (this._tokensQueue.length > 0) {
return this.onToken(this._toToken(this._tokensQueue.shift()));
}
if (!this.hasMoreTokens()) {
return this.onToken(EOF_TOKEN);
}
let string = this._string.slice(this._cursor);
let lexRulesForState = lexRulesByConditions[this.getCurrentState()];
for (let i = 0; i < lexRulesForState.length; i++) {
let lexRuleIndex = lexRulesForState[i];
let lexRule = lexRules[lexRuleIndex];
let matched = this._match(string, lexRule[0]);
// Manual handling of EOF token (the end of string). Return it
// as `EOF` symbol.
if (string === '' && matched === '') {
this._cursor++;
}
if (matched !== null) {
yytext = matched;
yyleng = yytext.length;
let token = lexRule[1].call(this);
if (!token) {
return this.getNextToken();
}
// If multiple tokens are returned, save them to return
// on next `getNextToken` call.
if (Array.isArray(token)) {
const tokensToQueue = token.slice(1);
token = token[0];
if (tokensToQueue.length > 0) {
this._tokensQueue.unshift(...tokensToQueue);
}
}
return this.onToken(this._toToken(token, yytext));
}
}
if (this.isEOF()) {
this._cursor++;
return EOF_TOKEN;
}
this.throwUnexpectedToken(
string[0],
this._currentLine,
this._currentColumn
);
},
/**
* Throws default "Unexpected token" exception, showing the actual
* line from the source, pointing with the ^ marker to the bad token.
* In addition, shows `line:column` location.
*/
throwUnexpectedToken(symbol, line, column) {
const lineSource = this._string.split('\n')[line - 1];
let lineData = '';
if (lineSource) {
const pad = ' '.repeat(column);
lineData = '\n\n' + lineSource + '\n' + pad + '^\n';
}
throw new SyntaxError(
`${lineData}Unexpected token: "${symbol}" ` +
`at ${line}:${column}.`
);
},
getCursor() {
return this._cursor;
},
getCurrentLine() {
return this._currentLine;
},
getCurrentColumn() {
return this._currentColumn;
},
_captureLocation(matched) {
const nlRe = /\n/g;
// Absolute offsets.
this._tokenStartOffset = this._cursor;
// Line-based locations, start.
this._tokenStartLine = this._currentLine;
this._tokenStartColumn =
this._tokenStartOffset - this._currentLineBeginOffset;
// Extract `\n` in the matched token.
let nlMatch;
while ((nlMatch = nlRe.exec(matched)) !== null) {
this._currentLine++;
this._currentLineBeginOffset = this._tokenStartOffset + nlMatch.index + 1;
}
this._tokenEndOffset = this._cursor + matched.length;
// Line-based locations, end.
this._tokenEndLine = this._currentLine;
this._tokenEndColumn = this._currentColumn =
(this._tokenEndOffset - this._currentLineBeginOffset);
},
_toToken(tokenType, yytext = '') {
return {
// Basic data.
type: tokenType,
value: yytext,
// Location data.
startOffset: this._tokenStartOffset,
endOffset: this._tokenEndOffset,
startLine: this._tokenStartLine,
endLine: this._tokenEndLine,
startColumn: this._tokenStartColumn,
endColumn: this._tokenEndColumn,
};
},
isEOF() {
return this._cursor === this._string.length;
},
hasMoreTokens() {
return this._cursor <= this._string.length;
},
_match(string, regexp) {
let matched = string.match(regexp);
if (matched) {
// Handle `\n` in the matched token to track line numbers.
this._captureLocation(matched[0]);
this._cursor += matched[0].length;
return matched[0];
}
return null;
},
/**
* Allows analyzing, and transforming token. Default implementation
* just passes the token through.
*/
onToken(token) {
return token;
},
};
/**
* Expose tokenizer so it can be accessed in semantic actions.
*/
yy.lexer = tokenizer;
yy.tokenizer = tokenizer;
/**
* Global parsing options. Some options can be shadowed per
* each `parse` call, if the optations are passed.
*
* Initalized to the `captureLocations` which is passed
* from the generator. Other options can be added at runtime.
*/
yy.options = {
captureLocations: true,
};
/**
* Parsing module.
*/
const yyparse = {
/**
* Sets global parsing options.
*/
setOptions(options) {
yy.options = options;
return this;
},
/**
* Returns parsing options.
*/
getOptions() {
return yy.options;
},
/**
* Parses a string.
*/
parse(string, parseOptions) {
if (!tokenizer) {
throw new Error(`Tokenizer instance wasn't specified.`);
}
tokenizer.initString(string);
/**
* If parse options are passed, override global parse options for
* this call, and later restore global options.
*/
let globalOptions = yy.options;
if (parseOptions) {
yy.options = Object.assign({}, yy.options, parseOptions);
}
/**
* Allow callers to do setup work based on the
* parsing string, and passed options.
*/
yyparse.onParseBegin(string, tokenizer, yy.options);
stack.length = 0;
stack.push(0);
let token = tokenizer.getNextToken();
let shiftedToken = null;
do {
if (!token) {
// Restore options.
yy.options = globalOptions;
unexpectedEndOfInput();
}
let state = stack[stack.length - 1];
let column = tokens[token.type];
if (!table[state].hasOwnProperty(column)) {
yy.options = globalOptions;
unexpectedToken(token);
}
let entry = table[state][column];
// Shift action.
if (entry[0] === 's') {
let loc = null;
if (yy.options.captureLocations) {
loc = {
startOffset: token.startOffset,
endOffset: token.endOffset,
startLine: token.startLine,
endLine: token.endLine,
startColumn: token.startColumn,
endColumn: token.endColumn,
};
}
shiftedToken = this.onShift(token);
stack.push(
{symbol: tokens[shiftedToken.type], semanticValue: shiftedToken.value, loc},
Number(entry.slice(1))
);
token = tokenizer.getNextToken();
}
// Reduce action.
else if (entry[0] === 'r') {
let productionNumber = entry.slice(1);
let production = productions[productionNumber];
let hasSemanticAction = typeof production[2] === 'function';
let semanticValueArgs = hasSemanticAction ? [] : null;
const locationArgs = (
hasSemanticAction && yy.options.captureLocations
? []
: null
);
if (production[1] !== 0) {
let rhsLength = production[1];
while (rhsLength-- > 0) {
stack.pop();
let stackEntry = stack.pop();
if (hasSemanticAction) {
semanticValueArgs.unshift(stackEntry.semanticValue);
if (locationArgs) {
locationArgs.unshift(stackEntry.loc);
}
}
}
}
const reduceStackEntry = {symbol: production[0]};
if (hasSemanticAction) {
yytext = shiftedToken ? shiftedToken.value : null;
yyleng = shiftedToken ? shiftedToken.value.length : null;
const semanticActionArgs = (
locationArgs !== null
? semanticValueArgs.concat(locationArgs)
: semanticValueArgs
);
production[2](...semanticActionArgs);
reduceStackEntry.semanticValue = __;
if (locationArgs) {
reduceStackEntry.loc = __loc;
}
}
const nextState = stack[stack.length - 1];
const symbolToReduceWith = production[0];
stack.push(
reduceStackEntry,
table[nextState][symbolToReduceWith]
);
}
// Accept.
else if (entry === 'acc') {
stack.pop();
let parsed = stack.pop();
if (stack.length !== 1 ||
stack[0] !== 0 ||
tokenizer.hasMoreTokens()) {
// Restore options.
yy.options = globalOptions;
unexpectedToken(token);
}
if (parsed.hasOwnProperty('semanticValue')) {
yy.options = globalOptions;
yyparse.onParseEnd(parsed.semanticValue);
return parsed.semanticValue;
}
yyparse.onParseEnd();
// Restore options.
yy.options = globalOptions;
return true;
}
} while (tokenizer.hasMoreTokens() || stack.length > 1);
},
setTokenizer(customTokenizer) {
tokenizer = customTokenizer;
return yyparse;
},
getTokenizer() {
return tokenizer;
},
onParseBegin(string, tokenizer, options) {},
onParseEnd(parsed) {},
/**
* Allows analyzing, and transforming shifted token. Default implementation
* just passes the token through.
*/
onShift(token) {
return token;
},
};
/**
* Lower group boundary:
*
* /(((a)b)c)(d)(e)/
*
* The first paren in (((a)b)c) has lower bound 0, but when
* we reach the (d), it already 4.
*/
let capturingGroupsCurrentLower = 0;
/**
* Group number to assign to a group.
*/
let currentCapturingGroup = 0;
/**
* Tracks capturing groups.
*/
let capturingGroupsCount = 0;
/**
* Tracks named groups.
*/
let namedGroups = {};
/**
* Parsing string.
*/
let parsingString = '';
yyparse.onParseBegin = (string, lexer) => {
parsingString = string;
capturingGroupsCurrentLower = 0;
currentCapturingGroup = 0;
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');
}
}
};
yyparse.onShift = token => {
if (token.type === 'L_PAREN' || token.type === 'NAMED_CAPTURE_GROUP') {
currentCapturingGroup++;
capturingGroupsCount++;
}
return token;
};
/**
* Updates the capturing groups counts.
*/
function updateCapturingGroupTracking() {
// Go up.
currentCapturingGroup--;
// We reached the top level, reset the current group:
if (currentCapturingGroup === capturingGroupsCurrentLower) {
currentCapturingGroup = capturingGroupsCount;
capturingGroupsCurrentLower = capturingGroupsCount;
}
}
/**
* 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`);
}
}
/**
* 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;