feat: remove class name sanitization, since CSS class names are alrea…

…dy HTML attribute escaped (#284)

Fixes #211

.version

@@ -1 +1 @@
-0.2.461
+0.2.455

docs/docs/03-syntax-and-usage/10-css-style-management.md

@@ -2,7 +2,7 @@
 
 ## HTML class attribute
 
-templ supports the HTML `class` attribute.
+The standard HTML `class` attribute can be added to components to set class names.
 
 ```templ
 templ button(text string) {
@@ -38,38 +38,26 @@ templ button(text string, className string) {
 }
 ```
 
-## CSS class name sanitization
-
-CSS class names that are passed to the class expression attribute as variables are sanitized, since the Go string might come from an untrustworthy source such as user input.
-
-If the class name fails the sanitization check, it will be replaced with `--templ-css-class-safe-name`.
-
-If you know that the CSS class name is from a trustworthy source (e.g. a string constant under your control), you can bypass sanitization by marking the class name as safe with the `templ.SafeClass()` function.
-
-```templ title="component.templ"
-package main
-
-templ button(text string) {
-	<button class={ "button", templ.SafeClass("hover:do_not_sanitize") }>{ text }</button>
-}
-```
-
 ### Dynamic class names
 
 Toggle addition of CSS classes to an element based on a boolean value by passing:
 
 * A `templ.KV` value containing the name of the class to add to the element, and a boolean that determines whether the class is added to the attribute at render time.
   * `templ.KV("is-primary", true)`
-  * `templ.KV(templ.SafeClass("hover:do_not_sanitize"), true)`
+  * `templ.KV("hover:red", true)`
 * A map of string class names to a boolean that determines if the class is added to the class attribute value at render time:
   * `map[string]bool`
-	* `map[CSSClass]bool`
+  * `map[CSSClass]bool`
 
 ```templ title="component.templ"
 package main
 
+css red() {
+	background-color: #ff0000;
+}
+
 templ button(text string, isPrimary bool) {
-	<button class={ "button", templ.KV("is-primary", isPrimary), templ.KV(templ.SafeClass("hover:do_not_sanitize", isPrimary) }>{ text }</button>
+	<button class={ "button", templ.KV("is-primary", isPrimary), templ.KV(red(), isPrimary) }>{ text }</button>
 }
 ```
 

generator/test-css-usage/expected.html

@@ -1,18 +1,17 @@
 <style>
-		.test {
-			color: #ff0000;
-		}
-</style>
-<style type="text/css">
-.className_f179{background-color:#ffffff;color:#ff0000;}
-</style>
-<button class="className_f179 --templ-css-class-safe-name safe safe2" type="button">A</button>
-<button class="className_f179 --templ-css-class-safe-name safe safe2" type="button">B</button>
-<style type="text/css">.green_58d2{color:#00ff00;}</style>
-<button class="green_58d2" type="button">Green</button>
-<div class="a c"></div>
-<div class="a"></div>
+	.test {
+		color: #ff0000;
+	}
+	</style>
+<div class="test">Style tags are supported</div>
+<style type="text/css">.cssComponentGreen_58d2{color:#00ff00;}</style>
+<div class="cssComponentGreen_58d2">CSS components are supported</div>
+<div class="cssComponentGreen_58d2 classA &amp;&amp;&amp;classB classC d e" type="button">Both CSS components and constants are supported</div>
+<div class="cssComponentGreen_58d2 classA &amp;&amp;&amp;classB classC d e" type="button">Both CSS components and constants are supported</div>
+<div class="a c">Maps can be used to determine if a class should be added or not.</div>
 <style type="text/css">.e_739d{font-size:14pt;}</style>
-<input type="email" id="email" name="email" class="a b e_739d" placeholder="[email protected]" autocomplete="off"/>
-<button class="bg-violet-500 hover:bg-violet-600">Save changes</button>
-
+<div class="a c e_739d">KV can be used to conditionally set classes.</div>
+<div class="bg-violet-500 hover:bg-red-600 hover:bg-sky-700 text-[#50d71e] w-[calc(100%-4rem)">Psuedo attributes and complex class names are supported.</div>
+<div class="a&#34; onClick=&#34;alert(&#39;hello&#39;)&#34;">
+	Class names are HTML escaped.
+</div>

generator/test-css-usage/render_test.go

@@ -11,7 +11,7 @@ import (
 var expected string
 
 func Test(t *testing.T) {
-	component := ThreeButtons()
+	component := TestComponent()
 
 	diff, err := htmldiff.Diff(component, expected)
 	if err != nil {

generator/test-css-usage/template.templ

@@ -1,14 +1,45 @@
 package testcssusage
 
-css green() {
-	color: #00ff00;
+// Constant class.
+
+templ StyleTagsAreSupported() {
+	<style>
+	.test {
+		color: #ff0000;
+	}
+	</style>
+	<div class="test">Style tags are supported</div>
 }
 
-css className() {
-	background-color: #ffffff;
+// CSS components.
+
+const red = "#00ff00"
+
+css cssComponentGreen() {
 	color: { red };
 }
 
+templ CSSComponentsAreSupported() {
+	<div class={ cssComponentGreen() }>CSS components are supported</div>
+}
+
+// Both CSS components and constants are supported.
+// Only string names are really required. There is no need to use templ.Class or templ.SafeClass.
+
+templ CSSComponentsAndConstantsAreSupported() {
+	<div class={ cssComponentGreen(), "classA", templ.Class("&&&classB"), templ.SafeClass("classC"), "d e" } type="button">Both CSS components and constants are supported</div>
+	// The following is also valid, but not required - you can put the class names in directly.
+	<div class={ templ.Classes(cssComponentGreen(), "classA", templ.Class("&&&classB"), templ.SafeClass("classC")), "d e" } type="button">Both CSS components and constants are supported</div>
+}
+
+// Maps can be used to determine if a class should be added or not.
+
+templ MapsCanBeUsedToConditionallySetClasses() {
+	<div class={ map[string]bool{"a": true, "b": false, "c": true} }>Maps can be used to determine if a class should be added or not.</div>
+}
+
+// The templ.KV function can be used to add a class if a condition is true.
+
 css d() {
 	font-size: 12pt;
 }
@@ -17,37 +48,30 @@ css e() {
 	font-size: 14pt;
 }
 
-templ Button(text string) {
-	<button class={ className(), templ.Class("&&&unsafe"), "safe", templ.SafeClass("safe2") } type="button">{ text }</button>
+templ KVCanBeUsedToConditionallySetClasses() {
+	<div class={ "a", templ.KV("b", false), "c", templ.KV(d(), false), templ.KV(e(), true) }>KV can be used to conditionally set classes.</div>
 }
 
-templ LegacySupport() {
-	<div class={ templ.Classes(templ.Class("test"), "a") }></div>
-}
+// Pseudo attributes can be used without any special syntax.
 
-templ MapCSSExample() {
-	<div class={ map[string]bool{"a": true, "b": false, "c": true} }></div>
+templ PsuedoAttributesAndComplexClassNamesAreSupported() {
+	<div class={ "bg-violet-500", "hover:bg-red-600", "hover:bg-sky-700", "text-[#50d71e]", "w-[calc(100%-4rem)" }>Psuedo attributes and complex class names are supported.</div>
 }
 
-templ KVExample() {
-	<div class={ "a", templ.KV("b", false) }></div>
-	<input type="email" id="email" name="email" class={ "a", "b", "c", templ.KV("c", false), templ.KV(d(), false), templ.KV(e(), true) } placeholder="[email protected]" autocomplete="off"/>
-}
+// Class names are HTML escaped.
 
-templ PsuedoAttributes() {
-	<button class={ "bg-violet-500", templ.KV(templ.SafeClass("hover:bg-violet-600"), true) }>Save changes</button>
+templ ClassNamesAreHTMLEscaped() {
+	<div class={ "a\" onClick=\"alert('hello')\"" }>Class names are HTML escaped.</div>
 }
 
-templ ThreeButtons() {
-	<style>
-		.test {
-			color: #ff0000;
-		}
-	</style>
-	{! Button("A") }
-	{! Button("B") }
-	<button class={ templ.Classes(green) } type="button">{ "Green" }</button>
-	{! MapCSSExample() }
-	{! KVExample() }
-	{! PsuedoAttributes() }
+// Combine all tests.
+
+templ TestComponent() {
+	@StyleTagsAreSupported()
+	@CSSComponentsAreSupported()
+	@CSSComponentsAndConstantsAreSupported()
+	@MapsCanBeUsedToConditionallySetClasses()
+	@KVCanBeUsedToConditionallySetClasses()
+	@PsuedoAttributesAndComplexClassNamesAreSupported()
+	@ClassNamesAreHTMLEscaped()
 }