PHPackages yui-ezic/z99-lexer - PHPackages - PHPackages [Skip to content](#main-content)[PHPackages](/)[Directory](/)[Categories](/categories)[Trending](/trending)[Leaderboard](/leaderboard)[Changelog](/changelog)[Analyze](/analyze)[Collections](/collections)[Log in](/login)[Sign up](/register) 1. [Directory](/) 2. / 3. [Utility & Helpers](/categories/utility) 4. / 5. yui-ezic/z99-lexer ActiveLibrary[Utility & Helpers](/categories/utility) yui-ezic/z99-lexer ================== Php lexer for Z99 (own Pascal-like programming language). 15PHP Since Apr 26Pushed 6y ago1 watchersCompare [ Source](https://github.com/Yui-Ezic/Z99Lexer)[ Packagist](https://packagist.org/packages/yui-ezic/z99-lexer)[ RSS](/packages/yui-ezic-z99-lexer/feed)WikiDiscussions master Synced 1mo ago READMEChangelogDependenciesVersions (1)Used By (0) PHP lexer for Z99 ================= [](#php-lexer-for-z99) Z99 is Pascal-like programming language developed for education purposes. Example of program written on Z99 ``` program first var i: int; sum, value : real; begin sum = 0.0; i = 1; repeat read (value); sum = sum + value; write(i, sum); i = i + 1; until i dgt - digit > chr - character > def - default > WS - white space [![gra3231 tmp](https://user-images.githubusercontent.com/21062493/76415790-8971a680-63a2-11ea-9a0b-93469e8555a0.png)](https://user-images.githubusercontent.com/21062493/76415790-8971a680-63a2-11ea-9a0b-93469e8555a0.png) For convenience, all final states begin with a minus and are highlighted in blue. 0 is start state. Create own grammar ------------------ [](#create-own-grammar) Firstly create the start State. ``` $fsm->addStart(0); ``` Than several intermediate state ``` $fsm->addState(1); $fsm->addState(2); ``` And add final state which has callback function which handle the substring and adds token to tokens table. The last argument tells the lexer when it's move to the initial state whether to take the next character or not. ``` $keywords = [ 'program', 'var', 'begin', 'read', 'write', 'repeat', 'until', 'if', 'then', 'fi' ]; $types = ['int', 'real', 'bool']; $boolConstants = ['true', 'false']; $fsm->addFinalState(-2, static function (LexerWriterInterface $writer, string $string, int $line) use ($keywords, $types, $boolConstants) { $index = null; $string = substr($string, 0, -1); if (in_array($string, $keywords, true)) { $token = 'Keyword'; } elseif (in_array($string, $types, true)) { $token = 'Type'; } elseif (in_array($string, $boolConstants, true)) { $token = 'BoolConst'; } else { $token = 'Ident'; $index = $writer->addIdentifier($string); } $writer->addToken($line, $string, $token, $index); }, false); $fsm->addFinalState('error', static function (LexerWriterInterface $writer, string $string, int $line) { throw new LexerException('Unknown char.', $string, $line); }); ``` Then adds triggers (edges of graph) ``` $fsm->addTrigger(TriggerTypes::LETTER, 0, 1); $fsm->addTrigger(FSM::DEFAULT_STATE, 0, 'error'); $fsm->addTrigger(TriggerTypes::LETTER, 1, 1); $fsm->addTrigger(FSM::DEFAULT_STATE, 1, -2); $fsm->addTrigger(TriggerTypes::DIGIT, 1, 2); $fsm->addTrigger(FSM::DEFAULT_STATE, 2, -2); $fsm->addTrigger(TriggerTypes::LETTER, 2, 2); $fsm->addTrigger(TriggerTypes::DIGIT, 2, 2); ``` And display the graph of states ``` $fsm->visualize(); ``` [![gra283B tmp](https://user-images.githubusercontent.com/21062493/76421275-15d49700-63ac-11ea-9c3f-cdabe7a79033.png)](https://user-images.githubusercontent.com/21062493/76421275-15d49700-63ac-11ea-9c3f-cdabe7a79033.png) Lexer ----- [](#lexer) To create tables of tokens, constants and identifiers you need to create Lexer class which receives CharStreamInterface and FSM with our grammar. ``` $stream = new FileStream('example.z99'); // implements CharStreamInterface $lexer = new Lexer($stream, $fsm); ``` And run a `tokenize()` method ``` try { $lexer->tokenize(); foreach ($lexer->getTokens() as $token) { echo $token . PHP_EOL; } foreach ($lexer->getConstants() as $const) { echo $const . PHP_EOL; } foreach ($lexer->getIdentifiers() as $identifier) { echo $identifier . PHP_EOL; } } catch (LexerException $e) { echo $e->getMessage() . "\n With string: '" . $e->getString() . '\'' . "\n in line " . $e->getLine(); } ``` ### Health Score 18 — LowBetter than 8% of packages Maintenance20 Infrequent updates — may be unmaintained Popularity5 Limited adoption so far Community7 Small or concentrated contributor base Maturity34 Early-stage or recently created project Bus Factor1 Top contributor holds 100% of commits — single point of failure How is this calculated?**Maintenance (25%)** — Last commit recency, latest release date, and issue-to-star ratio. Uses a 2-year decay window. **Popularity (30%)** — Total and monthly downloads, GitHub stars, and forks. Logarithmic scaling prevents top-heavy scores. **Community (15%)** — Contributors, dependents, forks, watchers, and maintainers. 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