RQL parser

This is a RQL parsing library written in PHP.

This library consists of the following parts:

lexer for tokenization RQL code
parser for creating abstract syntax tree

Installation

The preferred way to install library is through composer.

Either run

composer require xiag/rql-parser

or add

"xiag/rql-parser": "*",

to the require section of your composer.json.

Basic usage

<?php
require 'vendor/autoload.php';

// RQL code
$rql = '(eq(a,string:1)|lt(b,2)|(c<>3&d>=string:4&e=eq=boolean:1))&u!=5&not(or(u=6,ge(i,10)))&z=1&(a==2|b<-3|in(c,(2,float:3)))&select(a,b)&sort(+a,-b)&limit(1,2)';

// lexer
$lexer = new Xiag\Rql\Parser\Lexer();

// tokenize RQL
$tokens = $lexer->tokenize($rql);

// default parser contains all parsing strategies
$parser = Xiag\Rql\Parser\Parser::createDefault();

// parsing
var_dump($parser->parse($tokens));

See also rql-command library. This is a console application to debug RQL lexing and parsing.

Advanced usage

See examples:

Current state

Operators

Basic syntax

scalar operators
- eq(a,b)
- ne(a,b)
- lt(a,b)
- gt(a,b)
- le(a,b)
- ge(a,b)
array operators
- in(a,(b,c))
- out(a,(b,c))
logic operators
- and(eq(a,b),ne(c,d))
- or(eq(a,b),ne(c,d))
- not(eq(a,b))

Short logic syntax

(eq(a,b)&ne(b,c))
(eq(a,b)|ne(b,c))

FIQL syntax

scalar operators
- a=eq=b
- a=ne=b
- a=lt=b
- a=gt=b
- a=le=b
- a=ge=b
array operators
- a=in=(b,c)
- a=out=(b,c)

Simplified FIQL syntax

a=b
a==b
a<>b
a!=b
a<b
a>b
a<=b
a>=b

Other

select(a,b,c)
sort(+a,-b)
limit(1,2)

All syntax variations may be used together.

Value types

string
- abc
- abc%20def
integer
- 1, +1, -1
float
- 1., +1., -1.
- 0.1, +0.1, -0.1,
- 0.1e5, +0.1e+5, -0.1e-5
- .1, +.1, -.1
- .1e5, +.1e+5, -.1e-5
boolean
- true, true()
- false, false()
null
- null, null()
empty
- empty()
date
- 2015-06-02
- 2015-06-02T20:00:00Z
glob
- abc*
- ?abc
- abc*def?

Type casting

string:1
boolean:0
integer:a
float:1

Encoding rules

String values

In string values all non-alphanumeric characters must be encoded with a percent (%) sign followed by two hex digits.

Examples:

eq(string,2015%2D05%2D30T15%3A10%3A00Z)
in(string,(%2B1%2E5,%2D1%2E5))
in(string,(null%28%29,empty%28%29,true%28%29,false%28%29))

String encoding in PHP:

function encodeString($value)
{
    return strtr(rawurlencode($value), [
        '-' => '%2D',
        '_' => '%5F',
        '.' => '%2E',
        '~' => '%7E',
    ]);
}

String encoding in JavaScript:

function encodeString(value) {
    return encodeURIComponent(value).replace(/[\-_\.~!\\'\*\(\)]/g, function (char) {
        return '%' + char.charCodeAt(0).toString(16).toUpperCase();
    });
}

Other values

Date, number and const-function values must not be encoded.