PHP code example of farafiri / php-parsing-tool

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

farafiri / php-parsing-tool example snippets

  $dates = '2012-03-04,2013-02-08,23.06.2012';

  $parser = new \ParserGenerator\Parser('start     :=> datesList.
                                         datesList :=> date "," datesList
                                                   :=> date.
                                         date      :=> year "-" month "-" day
                                                   :=> day "." month "." year.
                                         year      :=> /\d{4}/.
                                         month     :=> /\d{2}/.
                                         day       :=> /\d{2}/.');

  $parsed = $parser->parse($dates);

  //and now you want to get list of years
  foreach($parsed->findAll('year') as $year) {
    echo $year;
  }

  //this time you want to print all months form year 2012
  foreach($parsed->findAll('date') as $date) {
    if ((string) $date->findFirst('year') === '2012') {
      echo $date->findFirst('month');
    }
  }

  // by adding 'defaultBranchType' with 'PEG' value into options we declare grammar as PEG
  $parser = new \ParserGenerator\Parser('start :=> start "x"
                                               :=> "x".', array('defaultBranchType' => 'PEG'));
  // but PEG grammar cannot be left recursive, call parse will run infinite loop in this case
  //You have 2 solutions now
  //1-st: you can change grammar a bit:
  $parser = new \ParserGenerator\Parser('start :=> "x" start
                                               :=> "x".', array('defaultBranchType' => 'PEG'));

  //2-nd: use default branch type
  $parser = new \ParserGenerator\Parser('start :=> start "x"
                                               :=> "x".');

$nonGreedy = new \ParserGenerator\Parser('start :=> "a"* "a"*.');
$nonGreedy->parse("aaa")->getSubnode(0)->toString(); // "" first "a"* takes nothing
$nonGreedy->parse("aaa")->getSubnode(1)->toString(); // "aaa" so second must consume all left

$greedy = new \ParserGenerator\Parser('start :=> "a"** "a"**.');
$greedy->parse("aaa")->getSubnode(0)->toString(); // "aaa" first "a"** takes all
$greedy->parse("aaa")->getSubnode(1)->toString(); // "" so nothing left for second

$greedy = new \ParserGenerator\Parser('start :=> "a"** "a"+.');
// "aa" "a"** tries to take all but then parsing would fail and he must leave last char for "a"+
$greedy->parse("aaa")->getSubnode(0)->toString();
$greedy->parse("aaa")->getSubnode(1)->toString(); // "a"

$parser = new \ParserGenerator\Parser('start :=> word+",".
                                       word  :=> /\w+/.');
foreach($parser->parse("a,bc,d")->getSubnode(0)->getSubnodes() as $subnode) {
  echo $subnode . ' ';
} //prints "a , bc , d "

foreach($parser->parse("a,bc,d")->getSubnode(0)->getMainNodes() as $subnode) {
  echo $subnode . ' ';
} //prints "a bc d "

$parser = new \ParserGenerator\Parser('start :=> string.');
$stringNode = $parser->parse('"a\tb\"c"')->getSubnode(0);
echo (string) $stringNode; //prints:"a\tb\"c"
echo $stringNode->getValue(); //prints:a    b"c

//parser matching only integers from 3 to 17 (inclusive)
$parser = new \ParserGenerator\Parser('start :=> 3..17 .');
$parser->parse('2'); //false
$parser->parse('18'); //false
$parser->parse('12'); //syntax tree object

//parser matching only integers > 0
$parser = new \ParserGenerator\Parser('start :=> 1..infinity .');

//parser matching integers in hex decimal and oct
$parser = new \ParserGenerator\Parser('start :=> -inf..inf/hdo .');
$parser->parse('0x21')->getSubnode(0)->getValue(); // 33
$parser->parse('21')->getSubnode(0)->getValue(); //21
$parser->parse('021')->getSubnode(0)->getValue(); //17

//matching month number with leading 0 for < 10
$parser = new \ParserGenerator\Parser('start :=> 01..12 .');
$parser->parse('4'); //false
$parser->parse('04'); //syntax tree object

$parser = new \ParserGenerator\Parser('start :=> (time(Y-m-d) | time(d.m.Y)) .');
$parser->parse('2017-01-02')->getSubnode(0)->getValue(); // equal to new \DateTime('2017-01-02')
$parser->parse('03.05.2014')->getSubnode(0)->getValue(); // equal to new \DateTime('2014-05-03')

$parser = new \ParserGenerator\Parser('start   :=> word not is keyword.
                                       word    :=> /\w+/.
                                       keyword :=> ("do" | "while" | "if").');
$parser->parse('do'); //false
$parser->parse('doSomething'); // syntax tree object

$parser = new \ParserGenerator\Parser('start   :=> word not(is keyword or
                                                            is ("p" text /* we don`t want words starting with "p" */) or
                                                            is /./ /* we don`t want one letter words */ ).
                                       word    :=> /\w+/.
                                       keyword :=> ("do" | "while" | "if").');
$parser->parse('do'); //false
$parser->parse('d'); //false
$parser->parse('post'); //false
$parser->parse('doSomething'); // syntax tree object

$parser = new \ParserGenerator\Parser('start   :=> unorder("", ?"a", ?"b").');

$parser->parse('a'); //syntax tree object
$parser->parse('b'); //syntax tree object
$parser->parse(''); //false