fix: more sane errors for unclosed flow collections

package.json

@@ -40,9 +40,9 @@
   },
   "dependencies": {
     "@stoplight/ordered-object-literal": "^1.0.1",
-    "@stoplight/types": "^11.9.0",
+    "@stoplight/types": "^12.0.0",
     "@stoplight/yaml-ast-parser": "0.0.48",
-    "tslib": "^1.12.0"
+    "tslib": "^2.2.0"
   },
   "devDependencies": {
     "@stoplight/scripts": "3.1.0",

src/__tests__/parseWithPointers.spec.ts

@@ -34,7 +34,7 @@ describe('yaml parser', () => {
     expect(result.data).toEqual(HugeJSON);
   });
 
-  it('parses string according to YAML 1.2 spec', () => {
+  test('parses string according to YAML 1.2 spec', () => {
     const { data } = parseWithPointers(spectral481);
     expect(data).toHaveProperty(
       'components.schemas.RandomRequest.properties.implicit_string_date.example',
@@ -136,6 +136,88 @@ prop2: true
         },
       ]);
     });
+
+    test('unclosed flow sequence', () => {
+      const result = parseWithPointers(`austrian-cities: [
+- Vienna  
+- Graz
+- Linz
+- Salzburg
+`);
+      expect(result.diagnostics).toEqual([
+        {
+          severity: DiagnosticSeverity.Error,
+          message: 'invalid mixed usage of block and flow styles',
+          code: 'YAMLException',
+          range: {
+            start: {
+              character: 0,
+              line: 1,
+            },
+            end: {
+              character: 0,
+              line: 5,
+            },
+          },
+        },
+        {
+          severity: DiagnosticSeverity.Error,
+          message: 'unexpected end of the stream within a flow collection',
+          code: 'YAMLException',
+          range: {
+            start: {
+              character: 0,
+              line: 5,
+            },
+            end: {
+              character: 0,
+              line: 5,
+            },
+          },
+        },
+      ]);
+    });
+
+    test('unclosed flow mapping', () => {
+      const result = parseWithPointers(`austrian-cities: {
+- Vienna  
+- Graz
+- Linz
+- Salzburg
+`);
+      expect(result.diagnostics).toEqual([
+        {
+          severity: DiagnosticSeverity.Error,
+          message: 'invalid mixed usage of block and flow styles',
+          code: 'YAMLException',
+          range: {
+            start: {
+              character: 0,
+              line: 1,
+            },
+            end: {
+              character: 0,
+              line: 5,
+            },
+          },
+        },
+        {
+          severity: DiagnosticSeverity.Error,
+          message: 'unexpected end of the stream within a flow collection',
+          code: 'YAMLException',
+          range: {
+            start: {
+              character: 0,
+              line: 5,
+            },
+            end: {
+              character: 0,
+              line: 5,
+            },
+          },
+        },
+      ]);
+    });
   });
 
   describe('dereferencing anchor refs', () => {

src/parseWithPointers.ts

@@ -1,5 +1,5 @@
 import createOrderedObject, { getOrder } from '@stoplight/ordered-object-literal';
-import { DiagnosticSeverity, Dictionary, IDiagnostic, Optional } from '@stoplight/types';
+import { DiagnosticSeverity, Dictionary, IDiagnostic, IPosition, IRange, Optional } from '@stoplight/types';
 import {
   determineScalarType,
   load as loadAST,
@@ -164,6 +164,9 @@ function getLineLength(lineMap: number[], line: number) {
 
 const transformErrors = (errors: YAMLException[], lineMap: number[]): IDiagnostic[] => {
   const validations: IDiagnostic[] = [];
+  let possiblyUnexpectedFlow = -1;
+  let i = 0;
+
   for (const error of errors) {
     const validation: IDiagnostic = {
       code: error.name,
@@ -181,7 +184,19 @@ const transformErrors = (errors: YAMLException[], lineMap: number[]): IDiagnosti
       },
     };
 
+    const isBrokenFlow = error.reason === 'missed comma between flow collection entries';
+    if (isBrokenFlow) {
+      possiblyUnexpectedFlow = possiblyUnexpectedFlow === -1 ? i : possiblyUnexpectedFlow;
+    } else if (possiblyUnexpectedFlow !== -1) {
+      (validations[possiblyUnexpectedFlow].range as Dictionary<IPosition, keyof IRange>).end = validation.range.end;
+      validations[possiblyUnexpectedFlow].message = 'invalid mixed usage of block and flow styles';
+      validations.length = possiblyUnexpectedFlow + 1;
+      i = validations.length;
+      possiblyUnexpectedFlow = -1;
+    }
+
     validations.push(validation);
+    i++;
   }
 
   return validations;

yarn.lock

@@ -1580,10 +1580,10 @@
     typedoc "0.13.x"
     typescript-plugin-styled-components "1.0.x"
 
-"@stoplight/types@^11.9.0":
-  version "11.9.0"
-  resolved "https://registry.yarnpkg.com/@stoplight/types/-/types-11.9.0.tgz#ced7de2dd53439d2409a3cb390bf7d5b76382ac6"
-  integrity sha512-4bzPpWZobt0e+d0OtALCJyl1HGzKo6ur21qxnId9dTl8v3yeD+5HJKZ2h1mv7e94debH5QDtimMU80V6jbXM8Q==
+"@stoplight/types@^12.0.0":
+  version "12.0.0"
+  resolved "https://registry.yarnpkg.com/@stoplight/types/-/types-12.0.0.tgz#3fc68ffa954e7c0a0e6261a982d5c0cb52d5d969"
+  integrity sha512-BbL0MIbcCwrU4RidcVyMKnRwACnhr7WAEgPH8d6rwhg/j2DegdLadnXCnq8UJXUWW9Apbntgvic3yVGvLtVmxA==
   dependencies:
     "@types/json-schema" "^7.0.4"
     utility-types "^3.10.0"
@@ -12637,11 +12637,16 @@ [email protected]:
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.9.3.tgz#d7e4dd79245d85428c4d7e4822a79917954ca286"
   integrity sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ==
 
-tslib@^1.12.0, tslib@^1.7.1, tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0, tslib@^1.9.3:
+tslib@^1.7.1, tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0, tslib@^1.9.3:
   version "1.12.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.12.0.tgz#d1fc9cacd06a1456c62f2902b361573e83d66473"
   integrity sha512-5rxCQkP0kytf4H1T4xz1imjxaUUPMvc5aWp0rJ/VMIN7ClRiH1FwFvBt8wOeMasp/epeUnmSW6CixSIePtiLqA==
 
+tslib@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.2.0.tgz#fb2c475977e35e241311ede2693cee1ec6698f5c"
+  integrity sha512-gS9GVHRU+RGn5KQM2rllAlR3dU6m7AcpJKdtH8gFvQiC4Otgk98XnmMU+nZenHt/+VhnBPWwgrJsyrdcw6i23w==
+
 [email protected]:
   version "1.15.0"
   resolved "https://registry.yarnpkg.com/tslint-config-prettier/-/tslint-config-prettier-1.15.0.tgz#76b9714399004ab6831fdcf76d89b73691c812cf"