Use scss parser for css-in-js (#7883)

prettier · Mar 31, 2020 · 2d1142f · 2d1142f
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diff --git a/changelog_unreleased/javascript/pr-7883.md b/changelog_unreleased/javascript/pr-7883.md
@@ -0,0 +1,28 @@
+#### Fix regressions in styled-components template literals ([#7883](https://github.com/prettier/prettier/pull/7883) by [@thorn0](https://github.com/thorn0))
+
+<!-- prettier-ignore -->
+```js
+// Input
+const Icon = styled.div`
+  background:   var(--${background});
+  ${Link}:not(:first-child) {
+      fill:    rebeccapurple;
+  }
+`;
+
+// Prettier stable
+const Icon = styled.div`
+  background: var(-- ${background});
+  ${Link}:not (:first-child) {
+    fill: rebeccapurple;
+  }
+`;
+
+// Prettier master
+const Icon = styled.div`
+  background: var(--${background});
+  ${Link}:not(:first-child) {
+    fill: rebeccapurple;
+  }
+`;
+```
diff --git a/src/language-css/printer-postcss.js b/src/language-css/printer-postcss.js
@@ -246,11 +246,16 @@ function genericPrint(path, options, print) {
           ? concat([
               isDetachedRulesetCallNode(node)
                 ? ""
-                : isTemplatePlaceholderNode(node) &&
-                  /^\s*\n/.test(node.raws.afterName)
-                ? /^\s*\n\s*\n/.test(node.raws.afterName)
+                : isTemplatePlaceholderNode(node)
+                ? node.raws.afterName === ""
+                  ? ""
+                  : node.name.endsWith(":")
+                  ? " "
+                  : /^\s*\n\s*\n/.test(node.raws.afterName)
                   ? concat([hardline, hardline])
-                  : hardline
+                  : /^\s*\n/.test(node.raws.afterName)
+                  ? hardline
+                  : " "
                 : " ",
               path.call(print, "params"),
             ])
@@ -530,6 +535,15 @@ function genericPrint(path, options, print) {
           continue;
         }
 
+        // styled.div` background: var(--${one}); `
+        if (
+          !iPrevNode &&
+          iNode.value === "--" &&
+          iNextNode.type === "value-atword"
+        ) {
+          continue;
+        }
+
         // Ignore spaces before/after string interpolation (i.e. `"#{my-fn("_")}"`)
         const isStartSCSSInterpolationInString =
           iNode.type === "value-string" && iNode.value.startsWith("#{");

diff --git a/src/language-js/embed.js b/src/language-js/embed.js
@@ -36,36 +36,15 @@ function embed(path, print, textToDoc, options) {
         const rawQuasis = node.quasis.map((q) => q.value.raw);
         let placeholderID = 0;
         const text = rawQuasis.reduce((prevVal, currVal, idx) => {
-          if (idx === 0) {
-            return currVal;
-          }
-
-          let specialSuffix = ""; // colons and whitespaces
-
-          const trailingColons = currVal.match(/^(\s*)(:+)(\s*)/);
-          if (trailingColons) {
-            const whitespaceBeforeColons = !!trailingColons[1];
-            const numberOfColons = trailingColons[2].length;
-            const whitespaceAfterColons = !!trailingColons[3];
-
-            if (whitespaceAfterColons) {
-              // do nothing, it's not a pseudo-element or pseudo-class
-            } else {
-              if (whitespaceBeforeColons) {
-                specialSuffix += "-whitespace";
-              }
-              specialSuffix += "-colon".repeat(numberOfColons);
-
-              currVal = "\uffff" + currVal.slice(trailingColons[0].length);
-            }
-          }
-
-          const placeholder = `@prettier-placeholder${specialSuffix}-${placeholderID++}-id`;
-
-          return prevVal + placeholder + currVal;
+          return idx === 0
+            ? currVal
+            : prevVal +
+                "@prettier-placeholder-" +
+                placeholderID++ +
+                "-id" +
+                currVal;
         }, "");
-
-        const doc = textToDoc(text, { parser: "css" });
+        const doc = textToDoc(text, { parser: "scss" });
         return transformCssDoc(doc, path, print);
       }
 
@@ -313,21 +292,14 @@ function replacePlaceholders(quasisDoc, expressionDocs) {
       const placeholder = parts[atPlaceholderIndex];
       const rest = parts.slice(atPlaceholderIndex + 1);
       const placeholderMatch = placeholder.match(
-        /@prettier-placeholder((?:-whitespace|-colon)*)-(.+)-id([\s\S]*)/
+        /@prettier-placeholder-(.+)-id([\s\S]*)/
       );
-      const specialSuffix = placeholderMatch[1]; // colons and whitespaces
-      const placeholderID = placeholderMatch[2];
+      const placeholderID = placeholderMatch[1];
       // When the expression has a suffix appended, like:
       // animation: linear ${time}s ease-out;
-      let suffix = placeholderMatch[3];
+      const suffix = placeholderMatch[2];
       const expression = expressions[placeholderID];
 
-      if (specialSuffix) {
-        suffix =
-          specialSuffix.replace(/-whitespace/g, " ").replace(/-colon/g, ":") +
-          suffix.replace(/^\uffff/g, "");
-      }
-
       replaceCounter++;
       parts = parts
         .slice(0, atPlaceholderIndex)

diff --git a/tests/multiparser_js_css/__snapshots__/jsfmt.spec.js.snap b/tests/multiparser_js_css/__snapshots__/jsfmt.spec.js.snap
@@ -45,6 +45,64 @@ const Icon = styled.div\`
 ================================================================================
 `;
 
+exports[`colons-after-substitutions2.js 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+const Icon = styled.div\`
+  height: 48px;
+
+  \${Link}:nth-child(2) {
+    fill: rebeccapurple;
+  }
+\`;
+
+const Icon2 = styled.div\`
+  height: 48px;
+
+  \${Link}:empty:before{
+    fill: rebeccapurple;
+  }
+\`;
+
+const Icon3 = styled.div\`
+  height: 48px;
+
+  \${Link}:not(:first-child) {
+    fill: rebeccapurple;
+  }
+\`;
+
+=====================================output=====================================
+const Icon = styled.div\`
+  height: 48px;
+
+  \${Link}:nth-child(2) {
+    fill: rebeccapurple;
+  }
+\`;
+
+const Icon2 = styled.div\`
+  height: 48px;
+
+  \${Link}:empty:before {
+    fill: rebeccapurple;
+  }
+\`;
+
+const Icon3 = styled.div\`
+  height: 48px;
+
+  \${Link}:not(:first-child) {
+    fill: rebeccapurple;
+  }
+\`;
+
+================================================================================
+`;
+
 exports[`styled-components.js 1`] = `
 ====================================options=====================================
 parsers: ["babel"]
@@ -555,3 +613,23 @@ const Foo = styled.p\`
 
 ================================================================================
 `;
+
+exports[`var.js 1`] = `
+====================================options=====================================
+parsers: ["babel"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+const Something = styled.div\`
+  background: var(--\${one}); /* ... */
+  border: 1px solid var(--\${two}); /* ... */
+\`;
+
+=====================================output=====================================
+const Something = styled.div\`
+  background: var(--\${one}); /* ... */
+  border: 1px solid var(--\${two}); /* ... */
+\`;
+
+================================================================================
+`;
diff --git a/tests/multiparser_js_css/colons-after-substitutions2.js b/tests/multiparser_js_css/colons-after-substitutions2.js
@@ -0,0 +1,23 @@
+const Icon = styled.div`
+  height: 48px;
+
+  ${Link}:nth-child(2) {
+    fill: rebeccapurple;
+  }
+`;
+
+const Icon2 = styled.div`
+  height: 48px;
+
+  ${Link}:empty:before{
+    fill: rebeccapurple;
+  }
+`;
+
+const Icon3 = styled.div`
+  height: 48px;
+
+  ${Link}:not(:first-child) {
+    fill: rebeccapurple;
+  }
+`;
diff --git a/tests/multiparser_js_css/var.js b/tests/multiparser_js_css/var.js
@@ -0,0 +1,4 @@
+const Something = styled.div`
+  background: var(--${one}); /* ... */
+  border: 1px solid var(--${two}); /* ... */
+`;