Generate binary tree with a logic query string as input
npm install
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This lib provides a function parser whick take an optional options object and a string parameter, then returning a binary tree. As binary trees are not easy to use, this lib also provides an utility function which convert said binaryTree to a more usable query form
Avalaible options are for now :
spaces: String / array containing all spaces characters. Default : " \n\t"defaultOperator: Default operator to use between two strings. Default : 'and'
Available operators for now : AND, OR, parens, double quote
var parser = require('logic-query-parser');
var binaryTree = parser.parse('hello AND welcome');The binaryTree for this example will be :
{
lexeme: {
type: 'and'
},
left: {
lexeme: {
type: 'string',
value: 'hello'
},
left: null,
right: null
},
right: {
lexeme: {
type: 'string',
value: 'welcome'
},
left: null,
right: null
}
}Another example, slightly more complex:
var parser = require('logic-query-parser');
var binaryTree = parser.parse('(welcome OR bye) AND (hello OR ahoy)');And the binary tree :
{
lexeme: {
type: "and"
},
left: {
lexeme: {
type: "or"
},
left: {
lexeme: {
type: "string",
value: "welcome"
},
left: null,
right: null
},
right: {
lexeme: {
type: "string",
value: "bye"
},
left: null,
right: null
}
},
right: {
lexeme: {
type: "or"
},
left: {
lexeme: {
type: "string",
value: "hello"
},
left: null,
right: null
},
right: {
lexeme: {
type: "string",
value: "ahoy"
},
left: null,
right: null
}
}
}As said before, trees are useful but not easy to use. You can also get the "query form":
var parser = require('logic-query-parser');
var binaryTree = parser.parse('(welcome OR bye) AND (hello OR ahoy)');
var query = parser.utils.binaryTreeToQueryJson(binaryTree);Returning:
{
type: "and",
values: [
{
type: "or",
values: [
{
type: "string",
value: "welcome"
},
{
type: "string",
value: "bye"
}
]
},
{
type: "or",
values: [
{
type: "string",
value: "hello"
},
{
type: "string",
value: "ahoy"
}
]
}
]
}Take a look at config/tests.js for more samples
Support: support@anyfetch.com.