From 75dbb0b18e2102d271a5cfe78faf54fe22e83ac8 Mon Sep 17 00:00:00 2001
From: Daniel Woelfel <dwwoelfel@gmail.com>
Date: Fri, 29 Oct 2021 05:24:42 -0400
Subject: [PATCH] [RFC] fix: fix block string parsing in language parser
 (#1777)

* fix: fix block string parsing in language parser

* add changeset

Co-authored-by: Rikki Schulte <rikki.schulte@gmail.com>
---
 .changeset/thick-baboons-glow.md                     | 10 ++++++++++
 .../graphql-language-service-parser/src/Rules.ts     | 12 +++++++++++-
 .../src/onlineParser.ts                              | 10 ++++++++++
 .../graphql-language-service-parser/src/types.ts     |  1 +
 4 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/thick-baboons-glow.md

diff --git a/.changeset/thick-baboons-glow.md b/.changeset/thick-baboons-glow.md
new file mode 100644
index 00000000000..497cc1f6b12
--- /dev/null
+++ b/.changeset/thick-baboons-glow.md
@@ -0,0 +1,10 @@
+---
+"graphiql": patch
+"codemirror-graphql": patch
+"graphql-language-service-parser": patch
+"graphql-language-service": patch
+"graphql-language-service-server": patch
+"graphql-language-service-cli": patch
+---
+
+adopt block string parsing for variables in language parser
diff --git a/packages/graphql-language-service-parser/src/Rules.ts b/packages/graphql-language-service-parser/src/Rules.ts
index feae5313bc9..efc9983b4e0 100644
--- a/packages/graphql-language-service-parser/src/Rules.ts
+++ b/packages/graphql-language-service-parser/src/Rules.ts
@@ -192,7 +192,17 @@ export const ParseRules: { [name: string]: ParseRule } = {
     }
   },
   NumberValue: [t('Number', 'number')],
-  StringValue: [t('String', 'string')],
+  StringValue: [
+    {
+      style: 'string',
+      match: token => token.kind === 'String',
+      update(state: State, token: Token) {
+        if (token.value.startsWith('"""')) {
+          state.inBlockstring = !token.value.slice(3).endsWith('"""');
+        }
+      },
+    },
+  ],
   BooleanValue: [t('Name', 'builtin')],
   NullValue: [t('Name', 'keyword')],
   EnumValue: [name('string-2')],
diff --git a/packages/graphql-language-service-parser/src/onlineParser.ts b/packages/graphql-language-service-parser/src/onlineParser.ts
index 5c6d232ed3b..1321b8f68f1 100644
--- a/packages/graphql-language-service-parser/src/onlineParser.ts
+++ b/packages/graphql-language-service-parser/src/onlineParser.ts
@@ -81,6 +81,16 @@ function getToken(
   state: State,
   options: ParserOptions,
 ): string {
+  if (state.inBlockstring) {
+    if (stream.match(/.*"""/)) {
+      state.inBlockstring = false;
+      return 'string';
+    } else {
+      stream.skipToEnd();
+      return 'string';
+    }
+  }
+
   const { lexRules, parseRules, eatWhitespace, editorConfig } = options;
   // Restore state after an empty-rule.
   if (state.rule && state.rule.length === 0) {
diff --git a/packages/graphql-language-service-parser/src/types.ts b/packages/graphql-language-service-parser/src/types.ts
index 032a0812b7b..4898dea4c8d 100644
--- a/packages/graphql-language-service-parser/src/types.ts
+++ b/packages/graphql-language-service-parser/src/types.ts
@@ -52,6 +52,7 @@ export type State = {
   needsSeperator: boolean;
   needsAdvance?: boolean;
   indentLevel?: number;
+  inBlockstring?: boolean;
 };
 
 export const AdditionalRuleKinds: _AdditionalRuleKinds = {