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queryparser.js
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queryparser.js
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const moo = require('moo')
/*
// specific lexer rules:
- sublexer:'xxx'
- nextlexer:'yyy'
- skiptoken: true,
- notext: true
*/
let lexerTypes = {
selectors: {
space: { match: /\s+/, lineBreaks: true, skiptoken:true },
selector: { match: /./, lineBreaks: true, sublexer:'selector' , notext: true },
},
selector: {
space: { match: /\s+/, lineBreaks: true , skiptoken: true },
end: { match: /[,]/, lineBreaks: false, end:true },
selector_element: { match: /./, lineBreaks: true, sublexer:'selector_element' , notext: true },
},
selector_element: {
path: { match: /@/, lineBreaks: false , sublexer:'path' },
attribute: { match: /\[/, lineBreaks: false , sublexer:'attribute' },
id: { match: /\#/, lineBreaks: false , sublexer:'id' },
value: { match: /:value/, lineBreaks: false , sublexer:'value_operator' },
has: { match: /:has\(/, lineBreaks: false , sublexer:'has' },
not: { match: /:not\(/, lineBreaks: false , sublexer:'not' },
empty: { match: /:empty/, lineBreaks: false , }, // elements that have no children
parent: { match: /:parent/, lineBreaks: false , }, // have at least one child node
end: { match: /[\),\s]/, lineBreaks: true , end:true , notext: true },
},
path: {
separator: { match: /\//, lineBreaks: false, },
path_literal: { match: /[^\/\t\n\s\)|\]\*\?\^]+/, lineBreaks: false, },
path_token: { match: /[^\/\t\n\s\)|\]]+/, lineBreaks: false, },
path_end: { match: /[\/\t\n\s\)|\]]+/, lineBreaks: true, end:true, notext: true, skiptoken: true },
},
id: {
id_name: { match: /[^\/\n\s=<>\*\?\! \t\n\s\]\)]+/, lineBreaks: false, end:true },
},
has: {
end: { match: /[\)]/, lineBreaks: false , end:true , skiptoken: true},
space: { match: /\s+/, lineBreaks: true, skiptoken: true},
has_element: { match: /./, lineBreaks: true , notext: true, sublexer:'selector_element' },
},
not: {
end: { match: /[\)]/, lineBreaks: false , end:true , skiptoken: true},
space: { match: /\s+/, lineBreaks: true, skiptoken: true},
not_element: { match: /./, lineBreaks: true , notext: true, sublexer:'selector_element' },
},
attribute: {
space: { match: /\s+/, lineBreaks: true, skiptoken: true },
attribute_name: { match: /[^\/\n\s=<>\*\?\! \t\n\s\]\)]+/, lineBreaks: false, nextlexer:'attribute_operator' },
},
attribute_operator: {
space: { match: /\s+/, lineBreaks: true, skiptoken: true },
operator: { match: /[&|~=<>\*\?!^$]+/, lineBreaks: false, nextlexer:'attribute_value' },
attribute_end: { match: /]/, lineBreaks: true, end:true, skiptoken: true },
},
attribute_value: {
null: { match: /null/, lineBreaks: false, nextlexer:'attribute_end' },
string: { match: /"(?:[^"\\]|\\.)*"/, lineBreaks: false, nextlexer:'attribute_end' },
number: { match: /-?\d+\.?\d*/, lineBreaks: false, nextlexer:'attribute_end' },
bool: { match: /(?:true|false)/, lineBreaks: false, nextlexer:'attribute_end' },
},
attribute_end: {
attribute_end: { match: /]/, lineBreaks: true, end:true, skiptoken: true },
},
value_operator: {
operator: { match: /[&|~=<>\*\?!^$]+/, lineBreaks: false, nextlexer:'value_value' },
value_end: { match: /[\/\t\n\s\)|\]]/, lineBreaks: true, notext: true, end:true, skiptoken: true },
},
value_value: {
null: { match: /null/, lineBreaks: false, nextlexer:'attribute_end' },
string: { match: /"(?:[^"\\]|\\.)*"/, lineBreaks: false, end:true },
number: { match: /-?\d+\.?\d*/, lineBreaks: false, end:true },
bool: { match: /(?:true|false)/, lineBreaks: false, end:true },
},
}
class Query {
constructor(types) {
this.lexerTypes = types;
}
buildLexers() {
this.lexers = {};
for (var lexername in this.lexerTypes) {
let type = this.lexerTypes[lexername];
let lexer;
try {
let lexermoodefiniton = {};
Object.keys(type).forEach( (name) => lexermoodefiniton[name] = { match: type[name].match, lineBreaks:type[name].lineBreaks });
//console.log(lexermoodefiniton);
lexer = moo.compile(lexermoodefiniton);
lexer.type = type;
} catch (e) {
throw new Error("error while building lexer '"+lexername+"': "+e);
}
for (let tokenname in type) {
type[tokenname].name = tokenname;
}
type.name = lexername;
type.lexer = lexer;
this.lexers[lexername] = lexer;
type.toString = function() { return this.name; };
type.inspect = function() { return this.name; };
}
console.log(''+Object.keys(this.lexers).length+' lexers compiled: '+JSON.stringify(Object.keys(this.lexers)),"\n");
this.isBuilt = true;
}
parse(query, typename) {
if (!this.isBuilt) this.buildLexers();
typename = typename || 'selectors';
let nextlexer = this.lexers[typename];
let nextlexertype = this.lexerTypes[typename];
if (!nextlexer) throw new Error("unknown starting type '"+typename+"'");
let remainingString = query;
let rootToken = {
data: {
type: typename,
text: '',
value: null,
},
text: '',
parent: null,
children: [],
lexer: nextlexer,
lexerType: nextlexertype,
tokenType: {name:'root'},
};
let current = rootToken;
while (remainingString.length) {
//console.log(" - string = "+JSON.stringify(remainingString.substr(0,30)));
nextlexer.reset(remainingString);
let rawdata = nextlexer.next();
let tokenType = nextlexertype[rawdata.type];
console.log("iteration with '"+nextlexertype.name+"'. Found token: ",JSON.stringify(rawdata));
if (!rawdata) throw new Error("invalid syntax near '"+remainingString+"' ; (lexer="+current.lexerType+")");
let token = {
data: rawdata,
text: '',
parent: current,
children: [],
tokenType: tokenType,
lexer: tokenType.sublexer ? this.lexers[tokenType.sublexer] : nextlexer,
lexerType: tokenType.sublexer ? this.lexerTypes[tokenType.sublexer] : nextlexertype,
};
if (!token.tokenType.skiptoken) {
current.children.push(token);
}
if (token.tokenType.notext) {
token.text = '';
}
else {
token.text = token.data.text;
remainingString = remainingString.slice(token.text.length);
}
let t = token.parent;
while (t) {
t.text += token.text;
t = t.parent;
}
if (token.tokenType.nextlexer) {
nextlexertype = this.lexerTypes[token.tokenType.nextlexer];
nextlexer = this.lexers[token.tokenType.nextlexer];
nextlexer.reset(remainingString);
}
if (token.tokenType.sublexer) {
current = token;
nextlexertype = this.lexerTypes[token.tokenType.sublexer];
nextlexer = this.lexers[token.tokenType.sublexer];
nextlexer.reset(remainingString);
}
if (token.tokenType.end) {
console.log('END '+current.lexerType);
let parent = current.parent;
current = parent;
nextlexertype = parent.lexerType;
nextlexer = parent.lexer;
nextlexer.reset(remainingString);
}
}
while (current) {
console.log('QUERY FINAL: END '+current.lexerType);
current = current.parent;
}
return rootToken;
}
}
let testString = '@titi/*toto** [attr1] :value>=23 :has(@sub/* [attrSub*="i\'am (a \\"string\\")"]), [attr2=123]';
console.log('testString="'+testString+'"\n');
let query = new Query(lexerTypes);
let result = query.parse(testString, 'selectors');
let render = (token, indent) => {
(function() {
let ind = indent || '';
console.log(ind + "(" + /*token.lexerType.name+"/"+*/token.tokenType.name+") => '"+token.text + "'" );
token.children.map( (c) => { render(c, ind+" "); });
})();
}
console.log("\n\n*** results ***\n");
render(result);