MAPG-89 add classes that can link views into one PHP

src/View/Linker.php

@@ -0,0 +1,103 @@
+<?php namespace MapGuesser\View;
+
+class Linker
+{
+    private string $view;
+
+    public function __construct(string $view)
+    {
+        $this->view = $view;
+    }
+
+    public function generate(): void
+    {
+        $input = ROOT . '/views/' . $this->view . '.php';
+
+        $temporaryFiles = [];
+        $sections = [];
+        $extra = ['', ''];
+
+        do {
+            $parser = new Parser($input);
+            $fragment = $parser->parse();
+
+            $extends = $fragment->getExtends();
+
+            $sections = array_merge($sections, $fragment->getSections()); //TODO: detect if section defined multiple times
+            $extra[0] = $fragment->getExtra()[0] . $extra[0];
+            $extra[1] = $extra[1] . $fragment->getExtra()[1];
+
+            if ($extends === null) {
+                $this->writeFinal($extra, $input, ROOT . '/cache/views/' . $this->view . '.php');
+                break;
+            }
+
+            $tmpFile = tempnam(sys_get_temp_dir(), 'mapg-view-');
+            $temporaryFiles[] = $tmpFile;
+
+            $this->extendTemplate($sections, ROOT . '/views/' . $extends . '.php', $tmpFile);
+
+            $input = $tmpFile;
+        } while (true);
+
+        foreach ($temporaryFiles as $tmpFile) {
+            unlink($tmpFile);
+        }
+    }
+
+    private function extendTemplate(array $sections, string $file, string $output): void
+    {
+        $inputFileHandle = fopen($file, 'r');
+        if (!$inputFileHandle) {
+            throw new \Exception('Cannot open file ' . $file);
+        }
+
+        $outputFileHandle = fopen($output, 'w');
+        if (!$outputFileHandle) {
+            throw new \Exception('Cannot open file ' . $output . 'for writing.');
+        }
+
+        $lineNumber = 0;
+        while (($line = fgets($inputFileHandle)) !== false) {
+            ++$lineNumber;
+
+            if (preg_match('/^\s*@yields\(\'([\w\/]+)\'\)\s*$/', $line, $matches)) {
+                if (isset($sections[$matches[1]])) {
+                    fwrite($outputFileHandle, $sections[$matches[1]]);
+                }
+            } else {
+                fwrite($outputFileHandle, $line);
+            }
+        }
+
+        fclose($inputFileHandle);
+        fclose($outputFileHandle);
+    }
+
+    private function writeFinal(array $extra, string $file, string $output): void
+    {
+        $dirname = pathinfo($output, PATHINFO_DIRNAME);
+        if (!is_dir($dirname)) {
+            mkdir($dirname, 0755, true);
+        }
+
+        $inputFileHandle = fopen($file, 'r');
+        if (!$inputFileHandle) {
+            throw new \Exception('Cannot open file ' . $file);
+        }
+
+        $outputFileHandle = fopen($output, 'w');
+        if (!$outputFileHandle) {
+            throw new \Exception('Cannot open file ' . $output . 'for writing.');
+        }
+
+        fwrite($outputFileHandle, $extra[0]);
+        while (($line = fgets($inputFileHandle)) !== false) {
+            fwrite($outputFileHandle, $line);
+        }
+        fwrite($outputFileHandle, $extra[1]);
+
+        fclose($inputFileHandle);
+        fclose($outputFileHandle);
+    }
+}