20220717

vendor/egulias/email-validator/src/Parser/FoldingWhiteSpace.php

@@ -0,0 +1,86 @@
+<?php
+namespace Egulias\EmailValidator\Parser;
+
+use Egulias\EmailValidator\EmailLexer;
+use Egulias\EmailValidator\Warning\CFWSNearAt;
+use Egulias\EmailValidator\Result\InvalidEmail;
+use Egulias\EmailValidator\Warning\CFWSWithFWS;
+use Egulias\EmailValidator\Result\Reason\CRNoLF;
+use Egulias\EmailValidator\Result\Reason\AtextAfterCFWS;
+use Egulias\EmailValidator\Result\Reason\CRLFAtTheEnd;
+use Egulias\EmailValidator\Result\Reason\CRLFX2;
+use Egulias\EmailValidator\Result\Reason\ExpectingCTEXT;
+use Egulias\EmailValidator\Result\Result;
+use Egulias\EmailValidator\Result\ValidEmail;
+
+class  FoldingWhiteSpace extends PartParser
+{
+    const FWS_TYPES = [
+        EmailLexer::S_SP,
+        EmailLexer::S_HTAB,
+        EmailLexer::S_CR,
+        EmailLexer::S_LF,
+        EmailLexer::CRLF
+    ];
+
+    public function parse() : Result
+    {
+        if (!$this->isFWS()) {
+            return new ValidEmail();
+        }
+
+        $previous = $this->lexer->getPrevious();
+
+        $resultCRLF = $this->checkCRLFInFWS();
+        if ($resultCRLF->isInvalid()) {
+            return $resultCRLF;
+        }
+
+        if ($this->lexer->token['type'] === EmailLexer::S_CR) {
+            return new InvalidEmail(new CRNoLF(), $this->lexer->token['value']);
+        }
+
+        if ($this->lexer->isNextToken(EmailLexer::GENERIC) && $previous['type']  !== EmailLexer::S_AT) {
+            return new InvalidEmail(new AtextAfterCFWS(), $this->lexer->token['value']);
+        }
+
+        if ($this->lexer->token['type'] === EmailLexer::S_LF || $this->lexer->token['type'] === EmailLexer::C_NUL) {
+            return new InvalidEmail(new ExpectingCTEXT(), $this->lexer->token['value']);
+        }
+
+        if ($this->lexer->isNextToken(EmailLexer::S_AT) || $previous['type']  === EmailLexer::S_AT) {
+            $this->warnings[CFWSNearAt::CODE] = new CFWSNearAt();
+        } else {
+            $this->warnings[CFWSWithFWS::CODE] = new CFWSWithFWS();
+        }
+
+        return new ValidEmail();
+    }
+
+    protected function checkCRLFInFWS() : Result
+    {
+        if ($this->lexer->token['type'] !== EmailLexer::CRLF) {
+            return new ValidEmail();
+        }
+
+        if (!$this->lexer->isNextTokenAny(array(EmailLexer::S_SP, EmailLexer::S_HTAB))) {
+            return new InvalidEmail(new CRLFX2(), $this->lexer->token['value']);
+        }
+
+        //this has no coverage. Condition is repeated from above one
+        if (!$this->lexer->isNextTokenAny(array(EmailLexer::S_SP, EmailLexer::S_HTAB))) {
+            return new InvalidEmail(new CRLFAtTheEnd(), $this->lexer->token['value']);
+        }
+
+        return new ValidEmail();
+    }
+     
+    protected function isFWS() : bool
+    {
+        if ($this->escaped()) {
+            return false;
+        }
+
+        return in_array($this->lexer->token['type'], self::FWS_TYPES);
+    }
+}