1 files changed, 61 insertions, 0 deletions

diff --git a/language-web/src/main/js/editor/xtextServiceResults.ts b/language-web/src/main/js/editor/xtextServiceResults.ts
new file mode 100644
index 00000000..2a66566a
--- /dev/null
+++ b/language-web/src/main/js/editor/xtextServiceResults.ts
@@ -0,0 +1,61 @@
+export interface IDocumentStateResult {
+  stateId: string;
+}
+
+export function isDocumentStateResult(result: unknown): result is IDocumentStateResult {
+  const documentStateResult = result as IDocumentStateResult;
+  return typeof documentStateResult.stateId === 'string';
+}
+
+export const VALID_CONFLICTS = ['invalidStateId', 'canceled'] as const;
+
+export type Conflict = typeof VALID_CONFLICTS[number];
+
+export interface IServiceConflictResult {
+  conflict: Conflict;
+}
+
+export function isServiceConflictResult(result: unknown): result is IServiceConflictResult {
+  const serviceConflictResult = result as IServiceConflictResult;
+  return typeof serviceConflictResult.conflict === 'string'
+    && VALID_CONFLICTS.includes(serviceConflictResult.conflict);
+}
+
+export const VALID_SEVERITIES = ['error', 'warning', 'info', 'ignore'] as const;
+
+export type Severity = typeof VALID_SEVERITIES[number];
+
+export interface IIssue {
+  description: string;
+
+  severity: Severity;
+
+  line: number;
+
+  column: number;
+
+  offset: number;
+
+  length: number;
+}
+
+export function isIssue(value: unknown): value is IIssue {
+  const issue = value as IIssue;
+  return typeof issue.description === 'string'
+    && typeof issue.severity === 'string'
+    && VALID_SEVERITIES.includes(issue.severity)
+    && typeof issue.line === 'number'
+    && typeof issue.column === 'number'
+    && typeof issue.offset === 'number'
+    && typeof issue.length === 'number';
+}
+
+export interface IValidationResult {
+  issues: IIssue[];
+}
+
+export function isValidationResult(result: unknown): result is IValidationResult {
+  const validationResult = result as IValidationResult;
+  return Array.isArray(validationResult.issues)
+    && validationResult.issues.every(isIssue);
+}