1 files changed, 74 insertions, 0 deletions
diff --git a/std/encoding/_yaml/loader/loader_state.ts b/std/encoding/_yaml/loader/loader_state.ts
new file mode 100644
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+++ b/std/encoding/_yaml/loader/loader_state.ts
@@ -0,0 +1,74 @@
+// Ported from js-yaml v3.13.1:
+// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
+// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+import { YAMLError } from "../error.ts";
+import { Schema, SchemaDefinition, TypeMap } from "../schema.ts";
+import { State } from "../state.ts";
+import { Type } from "../type.ts";
+import { Any, ArrayObject } from "../utils.ts";
+
+export interface LoaderStateOptions {
+  legacy?: boolean;
+  listener?: ((...args: Any[]) => void) | null;
+  /** string to be used as a file path in error/warning messages. */
+  filename?: string;
+  /** specifies a schema to use. */
+  schema?: SchemaDefinition;
+  /** compatibility with JSON.parse behaviour. */
+  json?: boolean;
+  /** function to call on warning messages. */
+  onWarning?(this: null, e?: YAMLError): void;
+}
+
+export type ResultType = [] | {} | string;
+
+export class LoaderState extends State {
+  public documents: Any[] = [];
+  public length: number;
+  public lineIndent = 0;
+  public lineStart = 0;
+  public position = 0;
+  public line = 0;
+  public filename?: string;
+  public onWarning?: (...args: Any[]) => void;
+  public legacy: boolean;
+  public json: boolean;
+  public listener?: ((...args: Any[]) => void) | null;
+  public implicitTypes: Type[];
+  public typeMap: TypeMap;
+
+  public version?: string | null;
+  public checkLineBreaks?: boolean;
+  public tagMap?: ArrayObject;
+  public anchorMap?: ArrayObject;
+  public tag?: string | null;
+  public anchor?: string | null;
+  public kind?: string | null;
+  public result: ResultType | null = "";
+
+  constructor(
+    public input: string,
+    {
+      filename,
+      schema,
+      onWarning,
+      legacy = false,
+      json = false,
+      listener = null,
+    }: LoaderStateOptions
+  ) {
+    super(schema);
+    this.filename = filename;
+    this.onWarning = onWarning;
+    this.legacy = legacy;
+    this.json = json;
+    this.listener = listener;
+
+    this.implicitTypes = (this.schema as Schema).compiledImplicit;
+    this.typeMap = (this.schema as Schema).compiledTypeMap;
+
+    this.length = input.length;
+  }
+}