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1	# jsonc-parser
2	Scanner and parser for JSON with comments.
3
4	[](https://www.npmjs.org/package/jsonc-parser![npm Package](https://img.shields.io/npm/v/jsonc-parser.svg?style=flat-square)](https://www.npmjs.org/package/jsonc-parser](https://www.npmjs.org/package/jsonc-parser)
5	[](https://npmjs.org/package/jsonc-parser![NPM Downloads](https://img.shields.io/npm/dm/jsonc-parser.svg)](https://npmjs.org/package/jsonc-parser](https://npmjs.org/package/jsonc-parser)
6	[](https://github.com/microsoft/node-jsonc-parser/workflows/Tests![Build Status](https://github.com/microsoft/node-jsonc-parser/workflows/Tests/badge.svg)](https://github.com/microsoft/node-jsonc-parser/workflows/Tests](https://github.com/microsoft/node-jsonc-parser/workflows/Tests)
7	[](https://opensource.org/licenses/MIT![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT](https://opensource.org/licenses/MIT)
8
9	Why?
10	----
11	JSONC is JSON with JavaScript style comments. This node module provides a scanner and fault tolerant parser that can process JSONC but is also useful for standard JSON.
12	- the scanner tokenizes the input string into tokens and token offsets
13	- the visit function implements a 'SAX' style parser with callbacks for the encountered properties and values.
14	- the parseTree function computes a hierarchical DOM with offsets representing the encountered properties and values.
15	- the parse function evaluates the JavaScript object represented by JSON string in a fault tolerant fashion.
16	- the getLocation API returns a location object that describes the property or value located at a given offset in a JSON document.
17	- the findNodeAtLocation API finds the node at a given location path in a JSON DOM.
18	- the format API computes edits to format a JSON document.
19	- the modify API computes edits to insert, remove or replace a property or value in a JSON document.
20	- the applyEdits API applies edits to a document.
21
22	Installation
23	------------
24
25	```
26	npm install --save jsonc-parser
27	```
28
29	API
30	---
31
32	### Scanner:
33	```typescript
34
35	/**
36	* Creates a JSON scanner on the given text.
37	* If ignoreTrivia is set, whitespaces or comments are ignored.
38	*/
39	export function createScanner(text: string, ignoreTrivia: boolean = false): JSONScanner;
40
41	/**
42	* The scanner object, representing a JSON scanner at a position in the input string.
43	*/
44	export interface JSONScanner {
45	/**
46	* Sets the scan position to a new offset. A call to 'scan' is needed to get the first token.
47	*/
48	setPosition(pos: number): any;
49	/**
50	* Read the next token. Returns the token code.
51	*/
52	scan(): SyntaxKind;
53	/**
54	* Returns the zero-based current scan position, which is after the last read token.
55	*/
56	getPosition(): number;
57	/**
58	* Returns the last read token.
59	*/
60	getToken(): SyntaxKind;
61	/**
62	* Returns the last read token value. The value for strings is the decoded string content. For numbers it's of type number, for boolean it's true or false.
63	*/
64	getTokenValue(): string;
65	/**
66	* The zero-based start offset of the last read token.
67	*/
68	getTokenOffset(): number;
69	/**
70	* The length of the last read token.
71	*/
72	getTokenLength(): number;
73	/**
74	* The zero-based start line number of the last read token.
75	*/
76	getTokenStartLine(): number;
77	/**
78	* The zero-based start character (column) of the last read token.
79	*/
80	getTokenStartCharacter(): number;
81	/**
82	* An error code of the last scan.
83	*/
84	getTokenError(): ScanError;
85	}
86	```
87
88	### Parser:
89	```typescript
90
91	export interface ParseOptions {
92	disallowComments?: boolean;
93	allowTrailingComma?: boolean;
94	allowEmptyContent?: boolean;
95	}
96	/**
97	* Parses the given text and returns the object the JSON content represents. On invalid input, the parser tries to be as fault tolerant as possible, but still return a result.
98	* Therefore always check the errors list to find out if the input was valid.
99	*/
100	export declare function parse(text: string, errors?: {error: ParseErrorCode;}[], options?: ParseOptions): any;
101
102	/**
103	* Parses the given text and invokes the visitor functions for each object, array and literal reached.
104	*/
105	export declare function visit(text: string, visitor: JSONVisitor, options?: ParseOptions): any;
106
107	/**
108	* Visitor called by {@linkcode visit} when parsing JSON.
109	*
110	* The visitor functions have the following common parameters:
111	* - `offset`: Global offset within the JSON document, starting at 0
112	* - `startLine`: Line number, starting at 0
113	* - `startCharacter`: Start character (column) within the current line, starting at 0
114	*
115	* Additionally some functions have a `pathSupplier` parameter which can be used to obtain the
116	* current `JSONPath` within the document.
117	*/
118	export interface JSONVisitor {
119	/**
120	* Invoked when an open brace is encountered and an object is started. The offset and length represent the location of the open brace.
121	* When `false` is returned, the array items will not be visited.
122	*/
123	onObjectBegin?: (offset: number, length: number, startLine: number, startCharacter: number, pathSupplier: () => JSONPath) => void \| boolean;
124
125	/**
126	* Invoked when a property is encountered. The offset and length represent the location of the property name.
127	* The `JSONPath` created by the `pathSupplier` refers to the enclosing JSON object, it does not include the
128	* property name yet.
129	*/
130	onObjectProperty?: (property: string, offset: number, length: number, startLine: number, startCharacter: number, pathSupplier: () => JSONPath) => void;
131	/**
132	* Invoked when a closing brace is encountered and an object is completed. The offset and length represent the location of the closing brace.
133	*/
134	onObjectEnd?: (offset: number, length: number, startLine: number, startCharacter: number) => void;
135	/**
136	* Invoked when an open bracket is encountered. The offset and length represent the location of the open bracket.
137	* When `false` is returned, the array items will not be visited.*
138	*/
139	onArrayBegin?: (offset: number, length: number, startLine: number, startCharacter: number, pathSupplier: () => JSONPath) => void \| boolean;
140	/**
141	* Invoked when a closing bracket is encountered. The offset and length represent the location of the closing bracket.
142	*/
143	onArrayEnd?: (offset: number, length: number, startLine: number, startCharacter: number) => void;
144	/**
145	* Invoked when a literal value is encountered. The offset and length represent the location of the literal value.
146	*/
147	onLiteralValue?: (value: any, offset: number, length: number, startLine: number, startCharacter: number, pathSupplier: () => JSONPath) => void;
148	/**
149	* Invoked when a comma or colon separator is encountered. The offset and length represent the location of the separator.
150	*/
151	onSeparator?: (character: string, offset: number, length: number, startLine: number, startCharacter: number) => void;
152	/**
153	* When comments are allowed, invoked when a line or block comment is encountered. The offset and length represent the location of the comment.
154	*/
155	onComment?: (offset: number, length: number, startLine: number, startCharacter: number) => void;
156	/**
157	* Invoked on an error.
158	*/
159	onError?: (error: ParseErrorCode, offset: number, length: number, startLine: number, startCharacter: number) => void;
160	}
161
162	/**
163	* Parses the given text and returns a tree representation the JSON content. On invalid input, the parser tries to be as fault tolerant as possible, but still return a result.
164	*/
165	export declare function parseTree(text: string, errors?: ParseError[], options?: ParseOptions): Node \| undefined;
166
167	export declare type NodeType = "object" \| "array" \| "property" \| "string" \| "number" \| "boolean" \| "null";
168	export interface Node {
169	type: NodeType;
170	value?: any;
171	offset: number;
172	length: number;
173	colonOffset?: number;
174	parent?: Node;
175	children?: Node[];
176	}
177
178	```
179
180	### Utilities:
181	```typescript
182	/**
183	* Takes JSON with JavaScript-style comments and remove
184	* them. Optionally replaces every none-newline character
185	* of comments with a replaceCharacter
186	*/
187	export declare function stripComments(text: string, replaceCh?: string): string;
188
189	/**
190	* For a given offset, evaluate the location in the JSON document. Each segment in the location path is either a property name or an array index.
191	*/
192	export declare function getLocation(text: string, position: number): Location;
193
194	/**
195	* A {@linkcode JSONPath} segment. Either a string representing an object property name
196	* or a number (starting at 0) for array indices.
197	*/
198	export declare type Segment = string \| number;
199	export declare type JSONPath = Segment[];
200	export interface Location {
201	/**
202	* The previous property key or literal value (string, number, boolean or null) or undefined.
203	*/
204	previousNode?: Node;
205	/**
206	* The path describing the location in the JSON document. The path consists of a sequence strings
207	* representing an object property or numbers for array indices.
208	*/
209	path: JSONPath;
210	/**
211	* Matches the locations path against a pattern consisting of strings (for properties) and numbers (for array indices).
212	* '*' will match a single segment, of any property name or index.
213	* '**' will match a sequence of segments or no segment, of any property name or index.
214	*/
215	matches: (patterns: JSONPath) => boolean;
216	/**
217	* If set, the location's offset is at a property key.
218	*/
219	isAtPropertyKey: boolean;
220	}
221
222	/**
223	* Finds the node at the given path in a JSON DOM.
224	*/
225	export function findNodeAtLocation(root: Node, path: JSONPath): Node \| undefined;
226
227	/**
228	* Finds the most inner node at the given offset. If includeRightBound is set, also finds nodes that end at the given offset.
229	*/
230	export function findNodeAtOffset(root: Node, offset: number, includeRightBound?: boolean) : Node \| undefined;
231
232	/**
233	* Gets the JSON path of the given JSON DOM node
234	*/
235	export function getNodePath(node: Node): JSONPath;
236
237	/**
238	* Evaluates the JavaScript object of the given JSON DOM node
239	*/
240	export function getNodeValue(node: Node): any;
241
242	/**
243	* Computes the edit operations needed to format a JSON document.
244	*
245	* @param documentText The input text
246	* @param range The range to format or `undefined` to format the full content
247	* @param options The formatting options
248	* @returns The edit operations describing the formatting changes to the original document following the format described in {@linkcode EditResult}.
249	* To apply the edit operations to the input, use {@linkcode applyEdits}.
250	*/
251	export function format(documentText: string, range: Range, options: FormattingOptions): EditResult;
252
253	/**
254	* Computes the edit operations needed to modify a value in the JSON document.
255	*
256	* @param documentText The input text
257	* @param path The path of the value to change. The path represents either to the document root, a property or an array item.
258	* If the path points to an non-existing property or item, it will be created.
259	* @param value The new value for the specified property or item. If the value is undefined,
260	* the property or item will be removed.
261	* @param options Options
262	* @returns The edit operations describing the changes to the original document, following the format described in {@linkcode EditResult}.
263	* To apply the edit operations to the input, use {@linkcode applyEdits}.
264	*/
265	export function modify(text: string, path: JSONPath, value: any, options: ModificationOptions): EditResult;
266
267	/**
268	* Applies edits to an input string.
269	* @param text The input text
270	* @param edits Edit operations following the format described in {@linkcode EditResult}.
271	* @returns The text with the applied edits.
272	* @throws An error if the edit operations are not well-formed as described in {@linkcode EditResult}.
273	*/
274	export function applyEdits(text: string, edits: EditResult): string;
275
276	/**
277	* An edit result describes a textual edit operation. It is the result of a {@linkcode format} and {@linkcode modify} operation.
278	* It consist of one or more edits describing insertions, replacements or removals of text segments.
279	* * The offsets of the edits refer to the original state of the document.
280	* * No two edits change or remove the same range of text in the original document.
281	* * Multiple edits can have the same offset if they are multiple inserts, or an insert followed by a remove or replace.
282	* * The order in the array defines which edit is applied first.
283	* To apply an edit result use {@linkcode applyEdits}.
284	* In general multiple EditResults must not be concatenated because they might impact each other, producing incorrect or malformed JSON data.
285	*/
286	export type EditResult = Edit[];
287
288	/**
289	* Represents a text modification
290	*/
291	export interface Edit {
292	/**
293	* The start offset of the modification.
294	*/
295	offset: number;
296	/**
297	* The length of the modification. Must not be negative. Empty length represents an insert.
298	*/
299	length: number;
300	/**
301	* The new content. Empty content represents a remove.
302	*/
303	content: string;
304	}
305
306	/**
307	* A text range in the document
308	*/
309	export interface Range {
310	/**
311	* The start offset of the range.
312	*/
313	offset: number;
314	/**
315	* The length of the range. Must not be negative.
316	*/
317	length: number;
318	}
319
320	/**
321	* Options used by {@linkcode format} when computing the formatting edit operations
322	*/
323	export interface FormattingOptions {
324	/**
325	* If indentation is based on spaces (`insertSpaces` = true), then what is the number of spaces that make an indent?
326	*/
327	tabSize: number;
328	/**
329	* Is indentation based on spaces?
330	*/
331	insertSpaces: boolean;
332	/**
333	* The default 'end of line' character
334	*/
335	eol: string;
336	}
337
338	/**
339	* Options used by {@linkcode modify} when computing the modification edit operations
340	*/
341	export interface ModificationOptions {
342	/**
343	* Formatting options. If undefined, the newly inserted code will be inserted unformatted.
344	*/
345	formattingOptions?: FormattingOptions;
346	/**
347	* Default false. If `JSONPath` refers to an index of an array and `isArrayInsertion` is `true`, then
348	* {@linkcode modify} will insert a new item at that location instead of overwriting its contents.
349	*/
350	isArrayInsertion?: boolean;
351	/**
352	* Optional function to define the insertion index given an existing list of properties.
353	*/
354	getInsertionIndex?: (properties: string[]) => number;
355	}
356	```
357
358
359	License
360	-------
361
362	(MIT License)
363
364	Copyright 2018, Microsoft
365