Normalize Whitespace Plugin: Add configuration via attributes (#3467)

Co-authored-by: Michael Schmidt <msrd0000@gmail.com>

plugins/normalize-whitespace/demo.html

@@ -17,6 +17,21 @@
 
 </pre>
 
+<pre data-break-lines="50">
+
+	<code>
+
+
+		var there_is_a_very_very_very_very_long_line_it_can_break_it_for_you = true;
+
+		if (there_is_a_very_very_very_very_long_line_it_can_break_it_for_you === true) {
+		};
+
+
+	</code>
+
+</pre>
+
 </section>
 
 <script src="prism.js"></script>

plugins/normalize-whitespace/index.html

@@ -57,7 +57,7 @@ <h1>How to use</h1>
 });
 </code></pre>
 
-	<p>The following settings are available:</p>
+	<p>The following settings are available and can be set via the <code>data-[setting]</code> attribute on the <code>&lt;pre&lt;</code> element:</p>
 
 	<dl>
 		<dt>remove-trailing</dt>
@@ -103,6 +103,16 @@ <h1>Examples</h1>
 		};
 
 
+		var
+		there_is_a_very_very_very_very_long_line_it_can_break_it_for_you
+		 = true;
+
+		if 
+		(there_is_a_very_very_very_very_long_line_it_can_break_it_for_you
+		 === true) {
+		};
+
+
 	</code>
 
 </pre>

plugins/normalize-whitespace/prism-normalize-whitespace.js

@@ -33,6 +33,18 @@
 		return str.length + res;
 	}
 
+	var settingsConfig = {
+		'remove-trailing': 'boolean',
+		'remove-indent': 'boolean',
+		'left-trim': 'boolean',
+		'right-trim': 'boolean',
+		'break-lines': 'number',
+		'indent': 'number',
+		'remove-initial-line-feed': 'boolean',
+		'tabs-to-spaces': 'number',
+		'spaces-to-tabs': 'number',
+	};
+
 	NormalizeWhitespace.prototype = {
 		setDefaults: function (defaults) {
 			this.defaults = assign(this.defaults, defaults);
@@ -161,6 +173,25 @@
 			return;
 		}
 
+		if (env.settings == null) { env.settings = {}; }
+
+		// Read settings from 'data-' attributes
+		for (var key in settingsConfig) {
+			if (Object.hasOwnProperty.call(settingsConfig, key)) {
+				var settingType = settingsConfig[key];
+				if (pre.hasAttribute('data-' + key)) {
+					try {
+						var value = JSON.parse(pre.getAttribute('data-' + key) || 'true');
+						if (typeof value === settingType) {
+							env.settings[key] = value;
+						}
+					} catch (_error) {
+						// ignore error
+					}
+				}
+			}
+		}
+
 		var children = pre.childNodes;
 		var before = '';
 		var after = '';