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keksAccountGUI/node_modulesOLD/regexp-tree/dist/interpreter/finite-automaton/nfa/nfa-from-regexp.js

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2019-08-11 18:48:02 +00:00
/**
* The MIT License (MIT)
* Copyright (c) 2017-present Dmitry Soshnikov <dmitry.soshnikov@gmail.com>
*/
'use strict';
function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
var parser = require('../../../parser');
var _require = require('./builders'),
alt = _require.alt,
char = _require.char,
or = _require.or,
rep = _require.rep,
plusRep = _require.plusRep,
questionRep = _require.questionRep;
/**
* Helper `gen` function calls node type handler.
*/
function gen(node) {
if (node && !generator[node.type]) {
throw new Error(node.type + ' is not supported in NFA/DFA interpreter.');
}
return node ? generator[node.type](node) : '';
}
/**
* AST handler.
*/
var generator = {
RegExp: function RegExp(node) {
if (node.flags !== '') {
throw new Error('NFA/DFA: Flags are not supported yet.');
}
return gen(node.body);
},
Alternative: function Alternative(node) {
var fragments = (node.expressions || []).map(gen);
return alt.apply(undefined, _toConsumableArray(fragments));
},
Disjunction: function Disjunction(node) {
return or(gen(node.left), gen(node.right));
},
Repetition: function Repetition(node) {
switch (node.quantifier.kind) {
case '*':
return rep(gen(node.expression));
case '+':
return plusRep(gen(node.expression));
case '?':
return questionRep(gen(node.expression));
default:
throw new Error('Unknown repeatition: ' + node.quantifier.kind + '.');
}
},
Char: function Char(node) {
if (node.kind !== 'simple') {
throw new Error('NFA/DFA: Only simple chars are supported yet.');
}
return char(node.value);
},
Group: function Group(node) {
return gen(node.expression);
}
};
module.exports = {
/**
* Builds an NFA from the passed regexp.
*/
build: function build(regexp) {
var ast = regexp;
if (regexp instanceof RegExp) {
regexp = '' + regexp;
}
if (typeof regexp === 'string') {
ast = parser.parse(regexp, {
captureLocations: true
});
}
return gen(ast);
}
};