Initial code import

actions-languageservice/src/validate.ts

@@ -0,0 +1,82 @@
+import {
+  convertWorkflowTemplate,
+  parseWorkflow,
+  ParseWorkflowResult,
+} from "@github/actions-workflow-parser";
+import { TokenRange } from "@github/actions-workflow-parser/templates/tokens/token-range";
+import { File } from "@github/actions-workflow-parser/workflows/file";
+import { TextDocument } from "vscode-languageserver-textdocument";
+import { Diagnostic, Range } from "vscode-languageserver-types";
+import { nullTrace } from "./nulltrace";
+
+/**
+ * Validates a workflow file
+ *
+ * @param textDocument Document to validate
+ * @returns Array of diagnostics
+ */
+export async function validate(
+  textDocument: TextDocument
+  // TODO: Support multiple files, context for API calls
+): Promise<Diagnostic[]> {
+  const file: File = {
+    name: textDocument.uri,
+    content: textDocument.getText(),
+  };
+
+  try {
+    const result: ParseWorkflowResult = parseWorkflow(
+      file.name,
+      [file],
+      nullTrace
+    );
+
+    if (result.value) {
+      // Errors will be updated in the context
+      convertWorkflowTemplate(result.context, result.value);
+    }
+
+    // For now map parser errors directly to diagnostics
+    return result.context.errors.getErrors().map((error) => {
+      let range = mapRange(error.range);
+      if (!range) {
+        // Use default range
+        range = {
+          start: {
+            line: 1,
+            character: 1,
+          },
+          end: {
+            line: 1,
+            character: 1,
+          },
+        };
+      }
+
+      return {
+        message: error.rawMessage,
+        range,
+      };
+    });
+  } catch (e) {
+    // TODO: Handle error here
+    return [];
+  }
+}
+
+function mapRange(range: TokenRange | undefined): Range | undefined {
+  if (!range) {
+    return undefined;
+  }
+
+  return {
+    start: {
+      line: range.start[0] - 1,
+      character: range.start[1] - 1,
+    },
+    end: {
+      line: range.end[0] - 1,
+      character: range.end[1] - 1,
+    },
+  };
+}