Extract helper functions

actions-languageservice/src/utils/rel-char-pos.ts

@@ -0,0 +1,15 @@
+import {TokenRange} from "@github/actions-workflow-parser/templates/tokens/token-range";
+import {Position} from "vscode-languageserver-textdocument";
+import {mapRange} from "./range";
+
+export function getRelCharOffset(tokenRange: TokenRange, currentInput: string, pos: Position): number {
+  const range = mapRange(tokenRange);
+  if (range.start.line !== range.end.line) {
+    const lines = currentInput.split("\n");
+    const lineDiff = pos.line - range.start.line - 1;
+    const linesBeforeCusor = lines.slice(0, lineDiff);
+    return linesBeforeCusor.join("\n").length + pos.character + 1;
+  } else {
+    return pos.character - range.start.character;
+  }
+}

actions-languageservice/src/utils/type-guards.ts

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+import {isString} from "@github/actions-workflow-parser";
+import {DefinitionType} from "@github/actions-workflow-parser/templates/schema/definition-type";
+import {StringDefinition} from "@github/actions-workflow-parser/templates/schema/string-definition";
+import {OPEN_EXPRESSION} from "@github/actions-workflow-parser/templates/template-constants";
+import {TemplateToken} from "@github/actions-workflow-parser/templates/tokens/index";
+
+export function isStringExpression(token: TemplateToken): boolean {
+  const isExpression =
+    token.definition?.definitionType === DefinitionType.String && (token.definition as StringDefinition).isExpression;
+  const containsExpression = isString(token) && token.value.indexOf(OPEN_EXPRESSION) >= 0;
+  return isExpression || containsExpression;
+}