Adjust filter plugin requirements to comply with 4.5.

Per https://moodledev.io/docs/4.5/devupdate#filter-plugins

Fixes moodlehq#321

src/Parser/StatementFilter.php

@@ -14,9 +14,11 @@
 
 use PhpParser\Node\Expr\Array_;
 use PhpParser\Node\Expr\Assign;
+use PhpParser\Node\Expr\FuncCall;
 use PhpParser\Node\Expr\PropertyFetch;
 use PhpParser\Node\Expr\Variable;
 use PhpParser\Node\Identifier;
+use PhpParser\Node\Name;
 use PhpParser\Node\Scalar\String_;
 use PhpParser\Node\Stmt;
 use PhpParser\Node\Stmt\Class_;
@@ -116,6 +118,26 @@ public function filterAssignments(array $statements): array
         return $assigns;
     }
 
+    /**
+     * Extract all the function call expressions from the statements.
+     *
+     * @param Stmt[] $statements
+     *
+     * @return FuncCall[]
+     */
+    public function filterFunctionCalls(array $statements): array
+    {
+        $calls = [];
+        foreach ($statements as $statement) {
+            // Only expressions that are function calls.
+            if ($statement instanceof Expression && $statement->expr instanceof FuncCall) {
+                $calls[] = $statement->expr;
+            }
+        }
+
+        return $calls;
+    }
+
     /**
      * Find first variable assignment with a given name.
      *

src/PluginValidate/Finder/FunctionCallFinder.php

@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of the Moodle Plugin CI package.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * Copyright (c) 2018 Blackboard Inc. (http://www.blackboard.com)
+ * License http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace MoodlePluginCI\PluginValidate\Finder;
+
+use PhpParser\Node\Name;
+
+/**
+ * Finds function call.
+ */
+class FunctionCallFinder extends AbstractParserFinder
+{
+    public function getType(): string
+    {
+        return 'function call';
+    }
+
+    public function findTokens($file, FileTokens $fileTokens): void
+    {
+        $statements = $this->parser->parseFile($file);
+
+        foreach ($this->filter->filterFunctionCalls($statements) as $funccall) {
+            if ($funccall->name instanceof Name) {
+                $fileTokens->compare((string) $funccall->name);
+            }
+        }
+    }
+}

src/PluginValidate/PluginValidate.php

@@ -17,6 +17,7 @@
 use MoodlePluginCI\PluginValidate\Finder\ClassFinder;
 use MoodlePluginCI\PluginValidate\Finder\FileTokens;
 use MoodlePluginCI\PluginValidate\Finder\FinderInterface;
+use MoodlePluginCI\PluginValidate\Finder\FunctionCallFinder;
 use MoodlePluginCI\PluginValidate\Finder\FunctionFinder;
 use MoodlePluginCI\PluginValidate\Finder\LangFinder;
 use MoodlePluginCI\PluginValidate\Finder\TableFinder;
@@ -115,6 +116,7 @@ public function verifyRequirements(): void
         $this->findRequiredTokens(new TableFinder(), [$this->requirements->getRequiredTables()]);
         $this->findRequiredTokens(new TablePrefixFinder(), [$this->requirements->getRequiredTablePrefix()]);
         $this->findRequiredTokens(new BehatTagFinder(), $this->requirements->getRequiredBehatTags());
+        $this->findRequiredTokens(new FunctionCallFinder(), $this->requirements->getRequiredFunctionCalls());
     }
 
     /**

src/PluginValidate/Requirements/AbstractRequirements.php

@@ -64,6 +64,13 @@ protected function behatTagsFactory(array $tags): array
         return $fileTokens;
     }
 
+    /**
+     * Required function calls.
+     *
+     * @return FileTokens[]
+     */
+    abstract public function getRequiredFunctionCalls(): array;
+
     /**
      * An array of required files, paths are relative to the plugin directory.
      *

src/PluginValidate/Requirements/FilterRequirements.php

@@ -21,20 +21,40 @@ class FilterRequirements extends GenericRequirements
 {
     public function getRequiredFiles(): array
     {
-        return array_merge(parent::getRequiredFiles(), [
-            'filter.php',
-        ]);
+        $files = ['filter.php'];
+        if ($this->moodleVersion >= 405) {
+            $files[] = 'classes/text_filter.php';
+        }
+
+        return array_merge(parent::getRequiredFiles(), $files);
     }
 
     public function getRequiredClasses(): array
     {
+        if ($this->moodleVersion <= 404) {
+            return [
+                FileTokens::create('filter.php')->mustHave('filter_' . $this->plugin->name),
+            ];
+        }
+
         return [
-            FileTokens::create('filter.php')->mustHave('filter_' . $this->plugin->name),
+            FileTokens::create('classes/text_filter.php')->mustHave("filter_{$this->plugin->name}\\text_filter"),
         ];
     }
 
     public function getRequiredStrings(): FileTokens
     {
         return FileTokens::create($this->getLangFile())->mustHave('filtername');
     }
+
+    public function getRequiredFunctionCalls(): array
+    {
+        if ($this->moodleVersion <= 404) {
+            return [];
+        }
+
+        return [
+            FileTokens::create('filter.php')->mustHave('class_alia'),
+        ];
+    }
 }

src/PluginValidate/Requirements/GenericRequirements.php

@@ -46,6 +46,11 @@ public function getRequiredClasses(): array
         return [];
     }
 
+    public function getRequiredFunctionCalls(): array
+    {
+        return [];
+    }
+
     public function getRequiredStrings(): FileTokens
     {
         return FileTokens::create($this->getLangFile())->mustHave('pluginname');

tests/PluginValidate/Requirements/FilterRequirementsTest.php

@@ -25,12 +25,14 @@ class FilterRequirementsTest extends \PHPUnit\Framework\TestCase
 
     protected function setUp(): void
     {
-        $this->requirements = new FilterRequirements(new Plugin('filter_activitynames', 'filter', 'activitynames', ''), 29);
+        $this->requirements404 = new FilterRequirements(new Plugin('filter_activitynames', 'filter', 'activitynames', ''), 404);
+        $this->requirements    = new FilterRequirements(new Plugin('filter_activitynames', 'filter', 'activitynames', ''), 405);
     }
 
     protected function tearDown(): void
     {
-        $this->requirements = null;
+        $this->requirements404 = null;
+        $this->requirements    = null;
     }
 
     public function testResolveRequirements()
@@ -39,29 +41,50 @@ public function testResolveRequirements()
 
         $this->assertInstanceOf(
             'MoodlePluginCI\PluginValidate\Requirements\FilterRequirements',
-            $resolver->resolveRequirements(new Plugin('', 'filter', '', ''), 29)
+            $resolver->resolveRequirements(new Plugin('', 'filter', '', ''), 404)
         );
     }
 
+    public function testGetRequiredFiles404()
+    {
+        $files = $this->requirements404->getRequiredFiles();
+
+        $this->assertTrue(in_array('filter.php', $files, true));
+        $this->assertFalse(in_array('classes/text_filter.php', $files, true));
+        foreach ($files as $file) {
+            $this->assertIsString($file);
+        }
+    }
+
     public function testGetRequiredFiles()
     {
         $files = $this->requirements->getRequiredFiles();
 
-        $this->assertNotEmpty($files);
         $this->assertTrue(in_array('filter.php', $files, true));
+        $this->assertTrue(in_array('classes/text_filter.php', $files, true));
         foreach ($files as $file) {
             $this->assertIsString($file);
         }
     }
 
+    public function testGetRequiredClasses404()
+    {
+        $classes = $this->requirements404->getRequiredClasses();
+
+        $this->assertCount(1, $classes);
+        $class = reset($classes);
+        $this->assertInstanceOf('MoodlePluginCI\PluginValidate\Finder\FileTokens', $class);
+        $this->assertSame('filter.php', $class->file);
+    }
+
     public function testGetRequiredClasses()
     {
         $classes = $this->requirements->getRequiredClasses();
 
-        $this->assertNotEmpty($classes);
-        foreach ($classes as $class) {
-            $this->assertInstanceOf('MoodlePluginCI\PluginValidate\Finder\FileTokens', $class);
-        }
+        $this->assertCount(1, $classes);
+        $class = reset($classes);
+        $this->assertInstanceOf('MoodlePluginCI\PluginValidate\Finder\FileTokens', $class);
+        $this->assertSame('classes/text_filter.php', $class->file);
     }
 
     public function testGetRequiredStrings()