From 720177ac5c04a7860b953fe2c6b51cf725295d77 Mon Sep 17 00:00:00 2001
From: fisker Cheung <lionkay@gmail.com>
Date: Tue, 25 Aug 2020 19:49:38 +0800
Subject: [PATCH] HTML: Fix format on files with frontMatter (#9043)

---
 changelog_unreleased/html/pr-9043.md          | 23 ++++++++++
 src/language-html/parser-html.js              |  4 ++
 .../__snapshots__/jsfmt.spec.js.snap          | 45 +++++++++++++++++++
 .../issue-9042-no-empty-line.html             |  5 +++
 tests/html/front-matter/issue-9042.html       |  6 +++
 5 files changed, 83 insertions(+)
 create mode 100644 changelog_unreleased/html/pr-9043.md
 create mode 100644 tests/html/front-matter/issue-9042-no-empty-line.html
 create mode 100644 tests/html/front-matter/issue-9042.html

diff --git a/changelog_unreleased/html/pr-9043.md b/changelog_unreleased/html/pr-9043.md
new file mode 100644
index 000000000000..89b75eafb40c
--- /dev/null
+++ b/changelog_unreleased/html/pr-9043.md
@@ -0,0 +1,23 @@
+#### Fix format on html with frontMatter ([#9043](https://github.com/prettier/prettier/pull/9043) by [@fisker](https://github.com/fisker))
+
+<!-- prettier-ignore -->
+```html
+<!-- Input -->
+---
+layout: foo
+---
+
+Test <a
+href="https://prettier.io">abc</a>.
+
+<!-- Prettier stable -->
+TypeError: Cannot read property 'end' of undefined
+  ...
+
+<!-- Prettier master -->
+---
+layout: foo
+---
+
+Test <a href="https://prettier.io">abc</a>.
+```
diff --git a/src/language-html/parser-html.js b/src/language-html/parser-html.js
index 7b1a93f7db1b..3dcdb4124336 100644
--- a/src/language-html/parser-html.js
+++ b/src/language-html/parser-html.js
@@ -280,6 +280,10 @@ function _parse(text, options, parserOptions, shouldParseFrontMatter = true) {
   };
 
   if (frontMatter) {
+    frontMatter.sourceSpan = {
+      start: { offset: 0 },
+      end: { offset: frontMatter.raw.length },
+    };
     rawAst.children.unshift(frontMatter);
   }
 
diff --git a/tests/html/front-matter/__snapshots__/jsfmt.spec.js.snap b/tests/html/front-matter/__snapshots__/jsfmt.spec.js.snap
index b79cca5d1846..8a8f1307535a 100644
--- a/tests/html/front-matter/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/html/front-matter/__snapshots__/jsfmt.spec.js.snap
@@ -28,3 +28,48 @@ slug: home
 
 ================================================================================
 `;
+
+exports[`issue-9042.html format 1`] = `
+====================================options=====================================
+parsers: ["html"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+---
+layout: foo
+---
+
+Test <a
+href="https://prettier.io">abc</a>.
+
+=====================================output=====================================
+---
+layout: foo
+---
+
+Test <a href="https://prettier.io">abc</a>.
+
+================================================================================
+`;
+
+exports[`issue-9042-no-empty-line.html format 1`] = `
+====================================options=====================================
+parsers: ["html"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+---
+layout: foo
+---
+Test <a
+href="https://prettier.io">abc</a>.
+
+=====================================output=====================================
+---
+layout: foo
+---
+
+Test <a href="https://prettier.io">abc</a>.
+
+================================================================================
+`;
diff --git a/tests/html/front-matter/issue-9042-no-empty-line.html b/tests/html/front-matter/issue-9042-no-empty-line.html
new file mode 100644
index 000000000000..b7f318b23b52
--- /dev/null
+++ b/tests/html/front-matter/issue-9042-no-empty-line.html
@@ -0,0 +1,5 @@
+---
+layout: foo
+---
+Test <a
+href="https://prettier.io">abc</a>.
diff --git a/tests/html/front-matter/issue-9042.html b/tests/html/front-matter/issue-9042.html
new file mode 100644
index 000000000000..e93627d7c3ba
--- /dev/null
+++ b/tests/html/front-matter/issue-9042.html
@@ -0,0 +1,6 @@
+---
+layout: foo
+---
+
+Test <a
+href="https://prettier.io">abc</a>.