Implemented a proper font registry

src/Elements/TextElement.php

@@ -7,52 +7,6 @@ use NoccyLabs\GdLabel\Element;
 class TextElement extends Element
 {
 
-    private static $fontCache = [];
-
-    private static function findFont($font, $style='regular')
-    {
-        if (count(self::$fontCache)==0) {
-            self::updateFonts();
-        }
-
-        $font = strtolower($font);
-
-        if (array_key_exists($font, self::$fontCache)) {
-            $info = self::$fontCache[$font];
-            if (!$style) {
-                return $info;
-            }
-            if (array_key_exists($style, $info)) {
-                return $info[$style];
-            }
-            return false;
-        }
-        return false;
-    }
-
-    private static function updateFonts()
-    {
-        exec("fc-list", $output, $ret);
-        if ($ret != 0) {
-            fprintf(STDERR, "%s\n", join("\n",$output));
-            return;
-        }
-        foreach ($output as $line) {
-            $seg = explode(":", $line);
-            $file = $seg[0];
-            $name = strtolower(trim(preg_replace("/[^A-Za-z0-9 ]/", '', $seg[1])));
-            $style = strtolower(str_replace("style=","",$seg[2]));
-            $style = explode(",",$style);
-            $style = reset($style);
-
-            if (!array_key_exists($name, self::$fontCache)) {
-                self::$fontCache[$name] = [];
-            }
-            self::$fontCache[$name][$style] = $file;
-        }
-
-    }
-
     protected function draw($gd, int $x, int $y, int $width, int $height, array $params)
     {
         if (($bound = $this->getProp("bind-value"))) {
@@ -62,8 +16,9 @@ class TextElement extends Element
         }
 
         $fontName = $this->getProp("font")?:"liberation sans";
+        $fontStyle = $this->getProp("font-style")?:"regular";
+        $font = \NoccyLabs\GdLabel\FontRegistry::getInstance()->findFont($fontName, $fontStyle);
 
-        $font = self::findFont($fontName);
         if (!$font) {
             return;
         }

src/FontRegistry.php

@@ -0,0 +1,113 @@
+<?php
+
+namespace NoccyLabs\GdLabel;
+
+class FontRegistry
+{
+
+    private $fonts = [];
+
+    private static $instance = null;
+
+    public static function getInstance()
+    {
+        if (!self::$instance) {
+            self::$instance = new FontRegistry();
+            self::$instance->load();
+        }
+        return self::$instance;
+    }
+
+    public function load(string $lang='en')
+    {
+        exec("fc-list -v", $out, $ret);
+        $meta = []; $curr = [];
+        foreach ($out as $line) {
+            if (trim($line)) {
+                $curr[] = $line;
+            } else {
+                $meta[] = $curr;
+                $curr = [];
+            }
+        }
+
+        foreach ($meta as $font) {
+            $this->parseMeta($font, $lang);
+        }
+    }
+
+    private function parseMeta(array $meta, string $lang)
+    {
+        $coll = [];
+        foreach ($meta as $line) {
+            if (9 != ord($line[0]) or strpos($line,": ") === false or ctype_digit($line[1])) {
+                continue;
+            }
+            list ($key, $values) = explode(": ", substr($line, 1), 2);
+            if (preg_match('/.+lang$/', $key)) {
+                $base = substr($key, 0, -4);
+                $baseMeta = $coll[$base];
+                $vals = str_getcsv($baseMeta, ' ', '"');
+                $langs = str_getcsv($values, ' ', '"');
+                $keep = [];
+                while (count($langs)>0) {
+                    $l = $this->parseValue(array_shift($langs));
+                    $v = $this->parseValue(array_shift($vals));
+                    if ($l == $lang) {
+                        $keep[] = $v;
+                    }
+                }
+                $coll[$base] = $keep;
+            } else {
+                $coll[$key] = $values;
+            }
+        }
+        foreach ($coll as $key=>$values) {
+            if (is_array($values)) {
+                continue;
+            }
+            $coll[$key] = $this->parseValue($values);
+        }
+        $langs = explode("|", $coll['lang']);
+        if (!in_array($lang, $langs)) {
+            return;
+        }
+        $this->fonts[] = (object)$coll;
+    }
+
+    private function parseValue($value)
+    {
+        if (substr($value, -3, 3) == "(s)") {
+            $value = substr($value, 0, -3);
+            if ($value && $value[0] == '"') {
+                $value = substr($value, 1, strpos($value, '"', 2)-1);
+            }
+        } 
+        if (substr($value, -3, 3) == "(i)") {
+            $value = intval($value);
+        } 
+        return $value;
+    }
+
+    public function findFont($family, $styles='regular')
+    {
+        $styles = explode(" ",$styles);
+        foreach ($this->fonts as $font) {
+            $families = array_map("strtolower", (array)$font->family);
+            if (!in_array(strtolower($family), $families)) {
+                continue;
+            }
+            $fontStyles = array_map("strtolower", $font->style);
+            foreach ($styles as $style) {
+                if (!in_array($style, $fontStyles)) {
+                    continue(2);
+                }
+            }
+            if (count(array_diff($fontStyles, $styles))>0) {
+                continue;
+            }
+            return $font->file;
+        }
+    }
+
+}