docs: publish .nojekyll so GitHub Pages serves underscore API pages (#952)

EOF

Co-authored-by: Cursor <[email protected]>

.all-contributorsrc

@@ -847,6 +847,24 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "YacovGold",
+      "name": "YacovGold",
+      "avatar_url": "https://avatars.githubusercontent.com/u/8984042?v=4",
+      "profile": "https://github.com/YacovGold",
+      "contributions": [
+        "code"
+      ]
+    },
+    {
+      "login": "sarathfrancis90",
+      "name": "Sarath Francis",
+      "avatar_url": "https://avatars.githubusercontent.com/u/9289498?v=4",
+      "profile": "https://github.com/sarathfrancis90",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

CHANGELOG.md

@@ -1,3 +1,34 @@
+# [10.29.0](https://github.com/harttle/liquidjs/compare/v10.28.0...v10.29.0) (2026-08-11)
+
+
+### Features
+
+* add unregisterFilter method ([#946](https://github.com/harttle/liquidjs/issues/946)) ([69b2c58](https://github.com/harttle/liquidjs/commit/69b2c589f9b69a34427cb8533ddb938bd997914f))
+* **filters:** add squish filter ([#943](https://github.com/harttle/liquidjs/issues/943)) ([875513f](https://github.com/harttle/liquidjs/commit/875513f4c5136bed0c64562cccabb21a7db8d36c))
+
+# [10.28.0](https://github.com/harttle/liquidjs/compare/v10.27.2...v10.28.0) (2026-08-01)
+
+
+### Bug Fixes
+
+* **date:** %s returns Unix epoch unaffected by display timezone ([#932](https://github.com/harttle/liquidjs/issues/932)) ([39c8743](https://github.com/harttle/liquidjs/commit/39c87437c5ef38ede9a208c9d55cd13231c6c023)), closes [#931](https://github.com/harttle/liquidjs/issues/931)
+
+
+### Features
+
+* Add support of inner expressions enclosed by parentheses ([#863](https://github.com/harttle/liquidjs/issues/863)) ([afa5f54](https://github.com/harttle/liquidjs/commit/afa5f5400428fc1ec935aca0282e579224660c95))
+
+## [10.27.2](https://github.com/harttle/liquidjs/compare/v10.27.1...v10.27.2) (2026-07-09)
+
+
+### Bug Fixes
+
+* charge join/json/inspect filters by produced output size ([#925](https://github.com/harttle/liquidjs/issues/925)) ([7ab49f9](https://github.com/harttle/liquidjs/commit/7ab49f999ac045ec1e87f3a7a9fd68dd9e8602b3))
+* **date:** zero-pad milliseconds when formatting %N fractional seconds ([#929](https://github.com/harttle/liquidjs/issues/929)) ([2634f9d](https://github.com/harttle/liquidjs/commit/2634f9de7b1228cd887b7cab880af8a795c77053))
+* enforce ownPropertyOnly for inherited array indices ([#924](https://github.com/harttle/liquidjs/issues/924)) ([552819a](https://github.com/harttle/liquidjs/commit/552819a84b80c62306fe61072628a756272dc749))
+* **filters:** modulo should follow divisor sign for negative operands ([#922](https://github.com/harttle/liquidjs/issues/922)) ([568bd5f](https://github.com/harttle/liquidjs/commit/568bd5f9cb99f596292c09fd70b00284b8216f0c))
+* **filters:** return empty for out-of-range slice begin or negative length ([#928](https://github.com/harttle/liquidjs/issues/928)) ([f9a1316](https://github.com/harttle/liquidjs/commit/f9a1316d161f4f20018c833160f42dfcf0cde507))
+
 ## [10.27.1](https://github.com/harttle/liquidjs/compare/v10.27.0...v10.27.1) (2026-06-23)
 
 

README.md

@@ -242,6 +242,8 @@ Want to contribute? see [Contribution Guidelines][contribution]. Thanks goes to
     </tr>
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/spokodev"><img src="https://avatars.githubusercontent.com/u/239690017?v=4?s=100" width="100px;" alt="spokodev"/><br /><sub><b>spokodev</b></sub></a><br /><a href="https://github.com/harttle/liquidjs/commits?author=spokodev" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/YacovGold"><img src="https://avatars.githubusercontent.com/u/8984042?v=4?s=100" width="100px;" alt="YacovGold"/><br /><sub><b>YacovGold</b></sub></a><br /><a href="https://github.com/harttle/liquidjs/commits?author=YacovGold" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/sarathfrancis90"><img src="https://avatars.githubusercontent.com/u/9289498?v=4?s=100" width="100px;" alt="Sarath Francis"/><br /><sub><b>Sarath Francis</b></sub></a><br /><a href="https://github.com/harttle/liquidjs/commits?author=sarathfrancis90" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>

docs/source/_data/sidebar.yml

@@ -94,6 +94,7 @@ filters:
   sort: sort.html
   sort_natural: sort_natural.html
   split: split.html
+  squish: squish.html
   strip: strip.html
   strip_html: strip_html.html
   strip_newlines: strip_newlines.html

docs/source/filters/date.md

@@ -34,6 +34,7 @@ The `date` filter is used to convert a timestamp into the specified format.
             * minutes: `-360` means `'+06:00'` and `360` means `'-06:00'`
             * timeZone ID: `Asia/Colombo` or `America/New_York`
     * See [here](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) for TZ database values
+* `%s` (seconds since the Unix epoch) identifies an instant rather than a wall-clock time, so it's not affected by the display timezone.
 
 ### Examples
 ```liquid

docs/source/filters/squish.md

@@ -0,0 +1,18 @@
+---
+title: squish
+---
+
+{% since %}v10.28.0{% endsince %}
+
+Removes leading and trailing whitespace from a string, and replaces every run of whitespace inside it with a single space.
+
+Input
+```liquid
+{{ "  Hello   there,
+    Major Tom.  " | squish }}
+```
+
+Output
+```text
+Hello there, Major Tom.
+```

docs/source/tutorials/register-filters-tags.md

@@ -62,7 +62,23 @@ See existing filter implementations here: <https://github.com/harttle/liquidjs/t
 
 ## Unregister Tags/Filters
 
-In some cases it's desirable to disable some tags/filters (see [#324](https://github.com/harttle/liquidjs/issues/324)). You'll need to register a dummy tag/filter that throws a corresponding Error.
+Filters can be unregistered by name:
+
+```javascript
+engine.unregisterFilter('plus')
+```
+
+With [`strictFilters`][strict-filters] enabled, using an unregistered filter will throw an error. Otherwise, the filter will be skipped.
+
+Built-in filters can be registered again using the exported `filters` object:
+
+```javascript
+import { filters } from 'liquidjs'
+
+engine.registerFilter('plus', filters.plus)
+```
+
+To disable a tag, or to make a disabled filter throw regardless of `strictFilters`, register a dummy implementation that throws a corresponding error (see [#324](https://github.com/harttle/liquidjs/issues/324)):
 
 ```javascript
 // disable a tag
@@ -81,3 +97,5 @@ function disabledFilter(name) {
 }
 engine.registerFilter('plus', disabledFilter('plus'));
 ```
+
+[strict-filters]: /tutorials/options.html#strict

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "liquidjs",
-  "version": "10.27.1",
+  "version": "10.29.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "liquidjs",
-      "version": "10.27.1",
+      "version": "10.29.0",
       "license": "MIT",
       "dependencies": {
         "commander": "^10.0.0"

package.json

@@ -1,6 +1,6 @@
 {
   "name": "liquidjs",
-  "version": "10.27.1",
+  "version": "10.29.0",
   "sideEffects": false,
   "description": "A simple, expressive, extensible Liquid template engine for JavaScript — Shopify, Jekyll and GitHub Pages compatible, for Node.js, browsers, and the CLI, with TypeScript support.",
   "main": "dist/liquid.node.js",
@@ -35,7 +35,7 @@
     "build:contributors": "node bin/build-contributors.js",
     "build:apidoc": "shx rm -rf docs/source/api && typedoc --plugin typedoc-plugin-missing-exports ./src --gitRevision master --out docs/source/api",
     "build:changelog": "node bin/build-changelog.js",
-    "build:docs-hexo": "cd docs && npm ci && npm run build && shx cp CNAME public/",
+    "build:docs-hexo": "cd docs && npm ci && npm run build && shx cp CNAME .nojekyll public/",
     "serve:docs": "cd docs && npm run start",
     "dev:docs": "run-s prepare:docs serve:docs"
   },

src/context/context.ts

@@ -31,6 +31,10 @@ export class Context {
    * The normalized liquid options object
    */
   public opts: NormalizedFullOptions
+  /**
+   * Reference to the Liquid instance for filter resolution
+   */
+  public liquid?: any
   /**
    * Throw when accessing undefined variable?
    */
@@ -38,7 +42,7 @@ export class Context {
   public ownPropertyOnly: boolean;
   public memoryLimit: Limiter;
   public renderLimit: Limiter;
-  public constructor (env: object = {}, opts: NormalizedFullOptions = defaultOptions, renderOptions: RenderOptions = {}, { memoryLimit, renderLimit }: { [key: string]: Limiter } = {}) {
+  public constructor (env: object = {}, opts: NormalizedFullOptions = defaultOptions, renderOptions: RenderOptions = {}, { memoryLimit, renderLimit, liquid }: { memoryLimit?: Limiter, renderLimit?: Limiter, liquid?: any } = {}) {
     this.sync = !!renderOptions.sync
     this.opts = opts
     this.globals = renderOptions.globals ?? opts.globals
@@ -47,6 +51,7 @@ export class Context {
     this.ownPropertyOnly = renderOptions.ownPropertyOnly ?? opts.ownPropertyOnly
     this.memoryLimit = memoryLimit ?? new Limiter('memory alloc', renderOptions.memoryLimit ?? opts.memoryLimit)
     this.renderLimit = renderLimit ?? new Limiter('template render', getPerformance().now() + (renderOptions.renderLimit ?? opts.renderLimit))
+    this.liquid = liquid
   }
   public getRegister<T> (key: string, defaultValue: T = undefined as T): T {
     return (this.registers[key] = this.registers[key] || defaultValue)
@@ -110,7 +115,8 @@ export class Context {
       ownPropertyOnly: this.ownPropertyOnly
     }, {
       renderLimit: this.renderLimit,
-      memoryLimit: this.memoryLimit
+      memoryLimit: this.memoryLimit,
+      liquid: this.liquid
     })
   }
   private findScope (key: string | number) {

src/filters/array.ts

@@ -114,6 +114,7 @@ export function slice<T> (this: FilterImpl, v: T[] | string, begin: number, leng
   if (isNil(v)) return []
   if (!isArray(v)) v = stringify(v)
   begin = begin < 0 ? v.length + begin : begin
+  if (begin < 0 || length < 0) return isArray(v) ? [] : ''
   this.context.memoryLimit.use(length)
   return isArray(v)
     ? Array.prototype.slice.call(v, begin, begin + length)

src/filters/string.ts

@@ -128,6 +128,12 @@ export function strip_newlines (this: FilterImpl, v: string) {
   return str.replace(/\r?\n/gm, '')
 }
 
+export function squish (this: FilterImpl, v: string) {
+  const str = stringify(v)
+  this.context.memoryLimit.use(str.length)
+  return str.replace(/\s+/g, ' ').trim()
+}
+
 export function capitalize (this: FilterImpl, str: string) {
   str = stringify(str)
   this.context.memoryLimit.use(str.length)

src/filters/url.ts

@@ -1,6 +1,6 @@
 import { stringify } from '../util/underscore'
 
-export const url_decode = (x: string) => decodeURIComponent(stringify(x)).replace(/\+/g, ' ')
+export const url_decode = (x: string) => decodeURIComponent(stringify(x).replace(/\+/g, ' '))
 export const url_encode = (x: string) => encodeURIComponent(stringify(x)).replace(/%20/g, '+')
 export const cgi_escape = (x: string) => encodeURIComponent(stringify(x))
   .replace(/%20/g, '+')

src/index.ts

@@ -11,7 +11,7 @@ export { Context, Scope } from './context'
 export { Value, Hash, Template, FilterImplOptions, Tag, Filter, Output, Variable, VariableLocation, VariableSegments, Variables, StaticAnalysis, StaticAnalysisOptions, analyze, analyzeSync, Arguments, PartialScope } from './template'
 export type { TagRenderReturn } from './template'
 export { Token, TopLevelToken, TagToken, ValueToken } from './tokens'
-export type { RangeToken, LiteralToken, QuotedToken, PropertyAccessToken, NumberToken } from './tokens'
+export type { RangeToken, LiteralToken, QuotedToken, PropertyAccessToken, NumberToken, FilteredValueToken } from './tokens'
 export { TokenKind, Tokenizer, ParseStream, Parser } from './parser'
 export { filters } from './filters'
 export * from './tags'

src/liquid-options.ts

@@ -87,6 +87,8 @@ export interface LiquidOptions {
   operators?: Operators;
   /** Respect parameter order when using filters like "for ... reversed limit", Defaults to `false`. */
   orderedFilterParameters?: boolean;
+  /** Allow parenthesized expressions as operands in conditions and loops, e.g. `{% if (foo | upcase) == "BAR" %}`. This is a non-standard extension to Liquid. Defaults to `false`. */
+  groupedExpressions?: boolean;
   /** For DoS handling, limit total length of templates parsed in one `parse()` call. A typical PC can handle 1e8 (100M) characters without issues. */
   parseLimit?: number;
   /** For DoS handling, limit total time (in ms) for each `render()` call. */
@@ -162,6 +164,7 @@ export interface NormalizedFullOptions extends NormalizedOptions {
   globals: object;
   keepOutputType: boolean;
   operators: Operators;
+  groupedExpressions: boolean;
   parseLimit: number;
   renderLimit: number;
   memoryLimit: number;
@@ -198,6 +201,7 @@ export const defaultOptions: NormalizedFullOptions = {
   globals: {},
   keepOutputType: false,
   operators: defaultOperators,
+  groupedExpressions: false,
   memoryLimit: Infinity,
   parseLimit: Infinity,
   renderLimit: Infinity

src/liquid.ts

@@ -31,7 +31,7 @@ export class Liquid {
   }
 
   public _render (tpl: Template[], scope: Context | object | undefined, renderOptions: RenderOptions): IterableIterator<any> {
-    const ctx = scope instanceof Context ? scope : new Context(scope, this.options, renderOptions)
+    const ctx = scope instanceof Context ? scope : new Context(scope, this.options, renderOptions, { liquid: this })
     return this.renderer.renderTemplates(tpl, ctx)
   }
   public async render (tpl: Template[], scope?: object, renderOptions?: RenderOptions): Promise<any> {
@@ -41,7 +41,7 @@ export class Liquid {
     return toValueSync(this._render(tpl, scope, { ...renderOptions, sync: true }))
   }
   public renderToNodeStream (tpl: Template[], scope?: object, renderOptions: RenderOptions = {}): NodeJS.ReadableStream {
-    const ctx = new Context(scope, this.options, renderOptions)
+    const ctx = new Context(scope, this.options, renderOptions, { liquid: this })
     return this.renderer.renderTemplatesToNodeStream(tpl, ctx)
   }
 
@@ -88,7 +88,7 @@ export class Liquid {
 
   public _evalValue (str: string, scope?: object | Context): IterableIterator<any> {
     const value = new Value(str, this)
-    const ctx = scope instanceof Context ? scope : new Context(scope, this.options)
+    const ctx = scope instanceof Context ? scope : new Context(scope, this.options, {}, { liquid: this })
     return value.value(ctx)
   }
   public async evalValue (str: string, scope?: object | Context): Promise<any> {
@@ -101,6 +101,9 @@ export class Liquid {
   public registerFilter (name: string, filter: FilterImplOptions) {
     this.filters[name] = filter
   }
+  public unregisterFilter (name: string) {
+    delete this.filters[name]
+  }
   public registerTag (name: string, tag: TagClass | TagImplOptions) {
     this.tags[name] = isFunction(tag) ? tag : createTagClass(tag)
   }

src/parser/parser.ts

@@ -33,7 +33,7 @@ export class Parser {
   public parse (html: string, filepath?: string): Template[] {
     html = String(html)
     this.parseLimit.use(html.length)
-    const tokenizer = new Tokenizer(html, this.liquid.options.operators, filepath)
+    const tokenizer = new Tokenizer(html, this.liquid.options.operators, filepath, undefined, this.liquid.options.groupedExpressions)
     const tokens = tokenizer.readTopLevelTokens(this.liquid.options)
     return this.parseTokens(tokens)
   }

src/parser/token-kind.ts

@@ -12,5 +12,6 @@ export enum TokenKind {
   Quoted = 1024,
   Operator = 2048,
   FilteredValue = 4096,
+  GroupedExpression = 8192,
   Delimited = Tag | Output
 }

src/parser/tokenizer.spec.ts

@@ -1,4 +1,4 @@
-import { LiquidTagToken, HTMLToken, QuotedToken, OutputToken, TagToken, OperatorToken, RangeToken, PropertyAccessToken, NumberToken, IdentifierToken } from '../tokens'
+import { LiquidTagToken, HTMLToken, QuotedToken, OutputToken, TagToken, OperatorToken, RangeToken, PropertyAccessToken, NumberToken, IdentifierToken, FilteredValueToken } from '../tokens'
 import { Tokenizer } from './tokenizer'
 import { defaultOperators } from '../render/operator'
 import { createTrie } from '../util/operator-trie'
@@ -229,24 +229,115 @@ describe('Tokenizer', function () {
   })
   describe('#readRange()', () => {
     it('should read `(1..3)`', () => {
-      const range = new Tokenizer('(1..3)').readRange()
+      const range = new Tokenizer('(1..3)').readGroupOrRange()
+      expect(range).toBeDefined()
       expect(range).toBeInstanceOf(RangeToken)
       expect(range!.getText()).toEqual('(1..3)')
-      const { lhs, rhs } = range!
-      expect(lhs).toBeInstanceOf(NumberToken)
-      expect(lhs.getText()).toBe('1')
-      expect(rhs).toBeInstanceOf(NumberToken)
-      expect(rhs.getText()).toBe('3')
+      expect((range as RangeToken).lhs).toBeInstanceOf(NumberToken)
+      expect((range as RangeToken).lhs.getText()).toBe('1')
+      expect((range as RangeToken).rhs).toBeInstanceOf(NumberToken)
+      expect((range as RangeToken).rhs.getText()).toBe('3')
     })
     it('should throw for `(..3)`', () => {
-      expect(() => new Tokenizer('(..3)').readRange()).toThrow('unexpected token "..3)", value expected')
+      expect(() => new Tokenizer('(..3)').readGroupOrRange()).toThrow('unexpected token "..3)", value expected')
     })
     it('should read `(a.b..c["..d"])`', () => {
-      const range = new Tokenizer('(a.b..c["..d"])').readRange()
+      const range = new Tokenizer('(a.b..c["..d"])').readGroupOrRange()
+      expect(range).toBeDefined()
       expect(range).toBeInstanceOf(RangeToken)
       expect(range!.getText()).toEqual('(a.b..c["..d"])')
     })
   })
+  describe('#readGroupedExpression()', () => {
+    function createGrouped (input: string): Tokenizer {
+      const t = new Tokenizer(input, defaultOperators)
+      t.groupedExpressions = true
+      return t
+    }
+    it('should read `(foo | upcase)` as FilteredValueToken', () => {
+      const token = createGrouped('(foo | upcase)').readValue()
+      expect(token).toBeInstanceOf(FilteredValueToken)
+      const grouped = token as FilteredValueToken
+      expect(grouped.getText()).toBe('(foo | upcase)')
+      expect(grouped.initial.postfix).toHaveLength(1)
+      expect(grouped.filters).toHaveLength(1)
+      expect(grouped.filters[0].name).toBe('upcase')
+    })
+    it('should read `(foo | append: "!")` with filter argument', () => {
+      const token = createGrouped('(foo | append: "!")').readValue()
+      expect(token).toBeInstanceOf(FilteredValueToken)
+      const grouped = token as FilteredValueToken
+      expect(grouped.filters).toHaveLength(1)
+      expect(grouped.filters[0].name).toBe('append')
+      expect(grouped.filters[0].args).toHaveLength(1)
+    })
+    it('should read nested `((foo | append: "!") | upcase)`', () => {
+      const token = createGrouped('((foo | append: "!") | upcase)').readValue()
+      expect(token).toBeInstanceOf(FilteredValueToken)
+      const grouped = token as FilteredValueToken
+      expect(grouped.filters).toHaveLength(1)
+      expect(grouped.filters[0].name).toBe('upcase')
+      expect(grouped.initial.postfix).toHaveLength(1)
+      expect(grouped.initial.postfix[0]).toBeInstanceOf(FilteredValueToken)
+    })
+    it('should parse `(a | upcase) == "BAR"` as expression', () => {
+      const exp = [...createGrouped('(a | upcase) == "BAR"').readExpressionTokens()]
+      expect(exp).toHaveLength(3)
+      expect(exp[0]).toBeInstanceOf(FilteredValueToken)
+      expect(exp[1]).toBeInstanceOf(OperatorToken)
+      expect(exp[1].getText()).toBe('==')
+      expect(exp[2]).toBeInstanceOf(QuotedToken)
+    })
+    it('should read `((a | upcase) > 3)` as outer FilteredValueToken with comparison inside parens', () => {
+      const token = createGrouped('((a | upcase) > 3)').readValue()
+      expect(token).toBeInstanceOf(FilteredValueToken)
+      const outer = token as FilteredValueToken
+      expect(outer.filters).toHaveLength(0)
+      expect(outer.getText()).toBe('((a | upcase) > 3)')
+      const [first, second, third] = outer.initial.postfix
+      expect(first).toBeInstanceOf(FilteredValueToken)
+      expect(second).toBeInstanceOf(NumberToken)
+      expect(third).toBeInstanceOf(OperatorToken)
+      expect((first as FilteredValueToken).filters[0].name).toBe('upcase')
+    })
+    it('should read `(1 < 3)` as grouped comparison with no filters', () => {
+      const token = createGrouped('(1 < 3)').readValue() as FilteredValueToken
+      expect(token.filters).toHaveLength(0)
+      expect(token.initial.postfix).toHaveLength(3)
+      expect(token.initial.postfix[0]).toBeInstanceOf(NumberToken)
+      expect(token.initial.postfix[1]).toBeInstanceOf(NumberToken)
+      expect((token.initial.postfix[2] as OperatorToken).operator).toBe('<')
+    })
+    it('should read redundant parens `(x)` as FilteredValueToken', () => {
+      const token = createGrouped('(x)').readValue() as FilteredValueToken
+      expect(token.filters).toHaveLength(0)
+      expect(token.initial.postfix).toHaveLength(1)
+    })
+    it('should read expression plus filters inside parens `(a == b | default: "x")`', () => {
+      const token = createGrouped('(a == b | default: "x")').readValue() as FilteredValueToken
+      expect(token.filters).toHaveLength(1)
+      expect(token.filters[0].name).toBe('default')
+      expect(token.initial.postfix.map((t) => t.getText()).join(' ')).toMatch(/a.*b.*==/)
+    })
+    it('should parse `((a | upcase) > 3) and (1 < 3)` as three expression tokens', () => {
+      const exp = [...createGrouped('((a | upcase) > 3) and (1 < 3)').readExpressionTokens()]
+      expect(exp).toHaveLength(3)
+      expect(exp[0]).toBeInstanceOf(FilteredValueToken)
+      expect(exp[1]).toBeInstanceOf(OperatorToken)
+      expect(exp[1].getText()).toBe('and')
+      expect(exp[2]).toBeInstanceOf(FilteredValueToken)
+    })
+    it('should still parse `(1..3)` as RangeToken', () => {
+      const token = createGrouped('(1..3)').readValue()
+      expect(token).toBeInstanceOf(RangeToken)
+    })
+    it('should throw for unclosed parens', () => {
+      expect(() => createGrouped('(foo | upcase').readValue()).toThrow('unbalanced parentheses')
+    })
+    it('should fall back to readRange when flag is off', () => {
+      expect(() => new Tokenizer('(foo | upcase)', defaultOperators).readValue()).toThrow('invalid range syntax')
+    })
+  })
   describe('#readFilter()', () => {
     it('should read a simple filter', function () {
       const tokenizer = new Tokenizer('| plus')

src/parser/tokenizer.ts

@@ -9,6 +9,7 @@ import { whiteSpaceCtrl } from './whitespace-ctrl'
 export class Tokenizer {
   p: number
   N: number
+  public groupedExpressions: boolean
   private rawBeginAt = -1
   private opTrie: Trie<OperatorHandler>
   private literalTrie: Trie<LiteralValue>
@@ -17,12 +18,14 @@ export class Tokenizer {
     public input: string,
     operators: Operators = defaultOptions.operators,
     public file?: string,
-    range?: [number, number]
+    range?: [number, number],
+    groupedExpressions = false
   ) {
     this.p = range ? range[0] : 0
     this.N = range ? range[1] : input.length
     this.opTrie = createTrie(operators)
     this.literalTrie = createTrie(literalValues)
+    this.groupedExpressions = groupedExpressions
   }
 
   readExpression () {
@@ -80,6 +83,7 @@ export class Tokenizer {
   readFilter (): FilterToken | null {
     this.skipBlank()
     if (this.end()) return null
+    if (this.peek() === ')') return null
     this.assert(this.read() === '|', `expected "|" before filter`)
     const name = this.readIdentifier()
     if (!name.size()) {
@@ -94,9 +98,9 @@ export class Tokenizer {
         const arg = this.readFilterArg()
         arg && args.push(arg)
         this.skipBlank()
-        this.assert(this.end() || this.peek() === ',' || this.peek() === '|', () => `unexpected character ${this.snapshot()}`)
+        this.assert(this.end() || this.peek() === ',' || this.peek() === '|' || this.peek() === ')', () => `unexpected character ${this.snapshot()}`)
       } while (this.peek() === ',')
-    } else if (this.peek() === '|' || this.end()) {
+    } else if (this.peek() === '|' || this.peek() === ')' || this.end()) {
       // do nothing
     } else {
       throw this.error('expected ":" after filter name')
@@ -307,10 +311,13 @@ export class Tokenizer {
     return -1
   }
 
-  readValue (): ValueToken | undefined {
+  readValue (): ValueToken | FilteredValueToken | undefined {
     this.skipBlank()
     const begin = this.p
-    const variable = this.readLiteral() || this.readQuoted() || this.readRange() || this.readNumber()
+    let variable: ValueToken | FilteredValueToken | undefined = this.readLiteral() || this.readQuoted() || this.readNumber()
+    if (!variable && this.peek() === '(') {
+      variable = this.readGroupOrRange()
+    }
     const props = this.readProperties(!variable)
     if (!props.length) return variable
     return new PropertyAccessToken(variable, props, this.input, begin, this.p)
@@ -385,18 +392,32 @@ export class Tokenizer {
     return literal
   }
 
-  readRange (): RangeToken | undefined {
+  readGroupOrRange (): FilteredValueToken | RangeToken | undefined {
     this.skipBlank()
     const begin = this.p
     if (this.peek() !== '(') return
     ++this.p
     const lhs = this.readValueOrThrow()
     this.skipBlank()
-    this.assert(this.read() === '.' && this.read() === '.', 'invalid range syntax')
-    const rhs = this.readValueOrThrow()
-    this.skipBlank()
-    this.assert(this.read() === ')', 'invalid range syntax')
-    return new RangeToken(this.input, begin, this.p, lhs, rhs, this.file)
+
+    if (this.peek() === '.' && this.peek(1) === '.') {
+      this.p += 2
+      const rhs = this.readValueOrThrow()
+      this.skipBlank()
+      this.assert(this.read() === ')', 'invalid range syntax')
+      return new RangeToken(this.input, begin, this.p, lhs, rhs, this.file)
+    }
+
+    if (this.groupedExpressions) {
+      const initial = new Expression([lhs, ...this.readExpressionTokens()])
+      this.assert(initial.valid(), () => `invalid value expression: ${this.snapshot()}`)
+      const filters = this.readFilters()
+      this.skipBlank()
+      this.assert(this.read() === ')', 'unbalanced parentheses')
+      return new FilteredValueToken(initial, filters, this.input, begin, this.p, this.file)
+    }
+
+    throw this.error('invalid range syntax')
   }
 
   readValueOrThrow (): ValueToken {

src/render/expression.ts

@@ -1,13 +1,14 @@
-import { QuotedToken, RangeToken, OperatorToken, Token, PropertyAccessToken, OperatorType, operatorTypes } from '../tokens'
-import { isRangeToken, isPropertyAccessToken, UndefinedVariableError, range, isOperatorToken, assert } from '../util'
+import { QuotedToken, RangeToken, OperatorToken, Token, PropertyAccessToken, OperatorType, operatorTypes, FilteredValueToken } from '../tokens'
+import { isRangeToken, isPropertyAccessToken, isFilteredValueToken, UndefinedVariableError, range, isOperatorToken, assert } from '../util'
 import type { Context } from '../context'
 import type { UnaryOperatorHandler } from '../render'
 import { Drop } from '../drop'
+import { Filter } from '../template/filter'
 
 export class Expression {
   readonly postfix: Token[]
 
-  public constructor (tokens: IterableIterator<Token>) {
+  public constructor (tokens: Iterable<Token>) {
     this.postfix = [...toPostfix(tokens)]
   }
   public * evaluate (ctx: Context, lenient?: boolean): Generator<unknown, unknown, unknown> {
@@ -40,6 +41,22 @@ export function * evalToken (token: Token | undefined, ctx: Context, lenient = f
   if ('content' in token) return token.content
   if (isPropertyAccessToken(token)) return yield evalPropertyAccessToken(token, ctx, lenient)
   if (isRangeToken(token)) return yield evalRangeToken(token, ctx)
+  if (isFilteredValueToken(token)) return yield evalFilteredValueToken(token, ctx, lenient)
+}
+
+function * evalFilteredValueToken (token: FilteredValueToken, ctx: Context, lenient: boolean): IterableIterator<unknown> {
+  assert(ctx.liquid, 'FilteredValueToken evaluation requires liquid instance in context')
+  lenient = lenient || (ctx.opts.lenientIf && token.filters.length > 0 && token.filters[0].name === 'default')
+  let val = yield token.initial.evaluate(ctx, lenient)
+
+  for (const filterToken of token.filters) {
+    const filterImpl = ctx.liquid.filters[filterToken.name]
+    assert(filterImpl || !ctx.liquid.options.strictFilters, () => `undefined filter: ${filterToken.name}`)
+    const filter = new Filter(filterToken, filterImpl, ctx.liquid)
+    val = yield filter.render(val, ctx)
+  }
+
+  return val
 }
 
 function * evalPropertyAccessToken (token: PropertyAccessToken, ctx: Context, lenient: boolean): IterableIterator<unknown> {
@@ -71,7 +88,7 @@ function * evalRangeToken (token: RangeToken, ctx: Context) {
   return range(+low, +high + 1)
 }
 
-function * toPostfix (tokens: IterableIterator<Token>): IterableIterator<Token> {
+function * toPostfix (tokens: Iterable<Token>): IterableIterator<Token> {
   const ops: OperatorToken[] = []
   for (const token of tokens) {
     if (isOperatorToken(token)) {

src/tags/case.ts

@@ -1,11 +1,11 @@
-import { ValueToken, Liquid, toValue, evalToken, Value, Emitter, TagToken, TopLevelToken, Context, Template, Tag, ParseStream } from '..'
+import { ValueToken, Liquid, toValue, evalToken, Value, Emitter, TagToken, TopLevelToken, Context, Template, Tag, ParseStream, FilteredValueToken } from '..'
 import { Parser } from '../parser'
 import { equals } from '../render'
 import { Arguments } from '../template'
 
 export default class extends Tag {
   value: Value
-  branches: { values: ValueToken[], templates: Template[] }[] = []
+  branches: { values: (ValueToken | FilteredValueToken)[], templates: Template[] }[] = []
   elseTemplates: Template[] = []
   constructor (tagToken: TagToken, remainTokens: TopLevelToken[], liquid: Liquid, parser: Parser) {
     super(tagToken, remainTokens, liquid)
@@ -22,7 +22,7 @@ export default class extends Tag {
 
         p = []
 
-        const values: ValueToken[] = []
+        const values: (ValueToken | FilteredValueToken)[] = []
         while (!token.tokenizer.end()) {
           values.push(token.tokenizer.readValueOrThrow())
           token.tokenizer.skipBlank()

src/tags/for.ts

@@ -1,4 +1,4 @@
-import { Hash, ValueToken, Liquid, Tag, evalToken, Emitter, TagToken, TopLevelToken, Context, Template, ParseStream } from '..'
+import { Hash, ValueToken, Liquid, Tag, evalToken, Emitter, TagToken, TopLevelToken, Context, Template, ParseStream, FilteredValueToken } from '..'
 import { assertEmpty, isValueToken, toEnumerable } from '../util'
 import { createScope } from '../context/scope'
 import { ForloopDrop } from '../drop/forloop-drop'
@@ -11,7 +11,7 @@ type valueOf<T> = T[keyof T]
 
 export default class extends Tag {
   variable: string
-  collection: ValueToken
+  collection: ValueToken | FilteredValueToken
   hash: Hash
   templates: Template[]
   elseTemplates: Template[]

src/tags/tablerow.ts

@@ -1,6 +1,6 @@
 import { isValueToken, toEnumerable } from '../util'
 import { createScope } from '../context/scope'
-import { ValueToken, Liquid, Tag, evalToken, Emitter, Hash, TagToken, TopLevelToken, Context, Template, ParseStream } from '..'
+import { ValueToken, Liquid, Tag, evalToken, Emitter, Hash, TagToken, TopLevelToken, Context, Template, ParseStream, FilteredValueToken } from '..'
 import { TablerowloopDrop } from '../drop/tablerowloop-drop'
 import { Parser } from '../parser'
 import { Arguments } from '../template'
@@ -9,7 +9,7 @@ export default class extends Tag {
   variable: string
   args: Hash
   templates: Template[]
-  collection: ValueToken
+  collection: ValueToken | FilteredValueToken
   constructor (tagToken: TagToken, remainTokens: TopLevelToken[], liquid: Liquid, parser: Parser) {
     super(tagToken, remainTokens, liquid)
     const variable = this.tokenizer.readIdentifier()

src/template/analysis.ts

@@ -2,6 +2,7 @@ import { Argument, Template, Value } from '.'
 import { isKeyValuePair } from '../parser/filter-arg'
 import { PropertyAccessToken, ValueToken } from '../tokens'
 import {
+  isFilteredValueToken,
   isNumberToken,
   isPropertyAccessToken,
   isQuotedToken,
@@ -371,11 +372,31 @@ function * extractValueTokenVariables (token: ValueToken): Generator<Variable> {
   if (isRangeToken(token)) {
     yield * extractValueTokenVariables(token.lhs)
     yield * extractValueTokenVariables(token.rhs)
+  } else if (isFilteredValueToken(token)) {
+    yield * extractGroupedExpressionTokenVariables(token)
   } else if (isPropertyAccessToken(token)) {
     yield extractPropertyAccessVariable(token)
   }
 }
 
+function * extractGroupedExpressionTokenVariables (token: ValueToken): Generator<Variable> {
+  if (!isFilteredValueToken(token)) return
+
+  for (const t of token.initial.postfix) {
+    if (isValueToken(t)) yield * extractValueTokenVariables(t)
+  }
+
+  for (const filter of token.filters) {
+    for (const arg of filter.args) {
+      if (isKeyValuePair(arg) && arg[1]) {
+        yield * extractValueTokenVariables(arg[1])
+      } else if (isValueToken(arg)) {
+        yield * extractValueTokenVariables(arg)
+      }
+    }
+  }
+}
+
 function extractPropertyAccessVariable (token: PropertyAccessToken): Variable {
   const segments: VariableSegments = []
 

src/template/output.ts

@@ -12,7 +12,7 @@ export class Output extends TemplateImpl<OutputToken> implements Template {
   value: Value
   public constructor (token: OutputToken, liquid: Liquid) {
     super(token)
-    const tokenizer = new Tokenizer(token.input, liquid.options.operators, token.file, token.contentRange)
+    const tokenizer = new Tokenizer(token.input, liquid.options.operators, token.file, token.contentRange, liquid.options.groupedExpressions)
     this.value = new Value(tokenizer.readFilteredValue(), liquid)
     const filters = this.value.filters
     const outputEscape = liquid.options.outputEscape

src/template/value.ts

@@ -15,7 +15,7 @@ export class Value {
    */
   public constructor (input: string | FilteredValueToken, liquid: Liquid) {
     const token: FilteredValueToken = typeof input === 'string'
-      ? new Tokenizer(input, liquid.options.operators).readFilteredValue()
+      ? new Tokenizer(input, liquid.options.operators, undefined, undefined, liquid.options.groupedExpressions).readFilteredValue()
       : input
     this.initial = token.initial
     this.filters = token.filters.map(token => new Filter(token, this.getFilter(liquid, token.name), liquid))

src/tokens/liquid-tag-token.ts

@@ -16,7 +16,7 @@ export class LiquidTagToken extends DelimitedToken {
     file?: string
   ) {
     super(TokenKind.Tag, [begin, end], input, begin, end, false, false, file)
-    this.tokenizer = new Tokenizer(input, options.operators, file, this.contentRange)
+    this.tokenizer = new Tokenizer(input, options.operators, file, this.contentRange, options.groupedExpressions)
     this.name = this.tokenizer.readTagName()
     this.tokenizer.assert(this.name, 'illegal liquid tag syntax')
     this.tokenizer.skipBlank()

src/tokens/property-access-token.ts

@@ -5,11 +5,12 @@ import { IdentifierToken } from './identifier-token'
 import { NumberToken } from './number-token'
 import { RangeToken } from './range-token'
 import { QuotedToken } from './quoted-token'
+import { FilteredValueToken } from './filtered-value-token'
 import { TokenKind } from '../parser'
 
 export class PropertyAccessToken extends Token {
   constructor (
-    public variable: QuotedToken | RangeToken | LiteralToken | NumberToken | undefined,
+    public variable: QuotedToken | RangeToken | LiteralToken | NumberToken | FilteredValueToken | undefined,
     public props: (ValueToken | IdentifierToken)[],
     input: string,
     begin: number,

src/tokens/tag-token.ts

@@ -17,7 +17,7 @@ export class TagToken extends DelimitedToken {
     const [valueBegin, valueEnd] = [begin + tagDelimiterLeft.length, end - tagDelimiterRight.length]
     super(TokenKind.Tag, [valueBegin, valueEnd], input, begin, end, trimTagLeft, trimTagRight, file)
 
-    this.tokenizer = new Tokenizer(input, options.operators, file, this.contentRange)
+    this.tokenizer = new Tokenizer(input, options.operators, file, this.contentRange, options.groupedExpressions)
     this.name = this.tokenizer.readTagName()
     this.tokenizer.assert(this.name, `illegal tag syntax, tag name expected`)
     this.tokenizer.skipBlank()

src/tokens/value-token.ts

@@ -3,5 +3,6 @@ import { LiteralToken } from './literal-token'
 import { NumberToken } from './number-token'
 import { QuotedToken } from './quoted-token'
 import { PropertyAccessToken } from './property-access-token'
+import { FilteredValueToken } from './filtered-value-token'
 
-export type ValueToken = RangeToken | LiteralToken | QuotedToken | PropertyAccessToken | NumberToken
+export type ValueToken = RangeToken | LiteralToken | QuotedToken | PropertyAccessToken | NumberToken | FilteredValueToken

src/util/liquid-date.ts

@@ -53,6 +53,15 @@ export class LiquidDate {
   getTime () {
     return this.displayDate.getTime()
   }
+  /**
+   * The underlying UTC timestamp in milliseconds, unaffected by the display
+   * timezone. Use this (not `getTime()`) for timezone-invariant values like
+   * `%s`: `getTime()` reads `displayDate`, which is deliberately shifted by
+   * the display timezone offset so wall-clock getters can delegate to Date.
+   */
+  dateValue () {
+    return this.date.getTime()
+  }
   getMilliseconds () {
     return this.displayDate.getMilliseconds()
   }

src/util/strftime.spec.ts

@@ -87,6 +87,15 @@ describe('util/strftime', function () {
       expect(t(time, '%10N')).toBe('1290000000')
       expect(t(time, '%0N')).toBe('129000000')
     })
+    it('should zero pad %N for sub-100ms fractional seconds', function () {
+      const time = new TestDate('2019-12-15 01:21:00.005')
+      expect(t(time, '%N')).toBe('005000000')
+      expect(t(time, '%3N')).toBe('005')
+      expect(t(time, '%6N')).toBe('005000')
+      const tens = new TestDate('2019-12-15 01:21:00.050')
+      expect(t(tens, '%N')).toBe('050000000')
+      expect(t(tens, '%2N')).toBe('05')
+    })
     it('should format %p as upper cased am/pm', function () {
       expect(t(now, '%p')).toBe('PM')
       expect(t(then, '%p')).toBe('AM')

src/util/strftime.ts

@@ -98,14 +98,14 @@ const formatCodes: Record<string, FormatCodeHandler> = {
   M: (d: LiquidDate) => d.getMinutes(),
   N: (d: LiquidDate, opts: FormatOptions) => {
     const width = Number(opts.width) || 9
-    const str = String(d.getMilliseconds()).slice(0, width)
+    const str = padStart(String(d.getMilliseconds()), 3, '0').slice(0, width)
     opts.memoryLimit?.use(width - str.length)
     return padEnd(str, width, '0')
   },
   p: (d: LiquidDate) => (d.getHours() < 12 ? 'AM' : 'PM'),
   P: (d: LiquidDate) => (d.getHours() < 12 ? 'am' : 'pm'),
   q: (d: LiquidDate) => ordinal(d),
-  s: (d: LiquidDate) => Math.round(d.getTime() / 1000),
+  s: (d: LiquidDate) => Math.floor(d.dateValue() / 1000),
   S: (d: LiquidDate) => d.getSeconds(),
   u: (d: LiquidDate) => d.getDay() || 7,
   U: (d: LiquidDate) => getWeekOfYear(d, 0),

src/util/type-guards.ts

@@ -1,4 +1,4 @@
-import { RangeToken, NumberToken, QuotedToken, LiteralToken, PropertyAccessToken, OutputToken, HTMLToken, TagToken, IdentifierToken, DelimitedToken, OperatorToken, ValueToken } from '../tokens'
+import { RangeToken, NumberToken, QuotedToken, LiteralToken, PropertyAccessToken, OutputToken, HTMLToken, TagToken, IdentifierToken, DelimitedToken, OperatorToken, ValueToken, FilteredValueToken } from '../tokens'
 import { TokenKind } from '../parser'
 
 export function isDelimitedToken (val: any): val is DelimitedToken {
@@ -45,9 +45,13 @@ export function isRangeToken (val: any): val is RangeToken {
   return getKind(val) === TokenKind.Range
 }
 
+export function isFilteredValueToken (val: any): val is FilteredValueToken {
+  return getKind(val) === TokenKind.FilteredValue
+}
+
 export function isValueToken (val: any): val is ValueToken {
-  // valueTokenBitMask = TokenKind.Number | TokenKind.Literal | TokenKind.Quoted | TokenKind.PropertyAccess | TokenKind.Range
-  return (getKind(val) & 1667) > 0
+  // valueTokenBitMask = TokenKind.Number | TokenKind.Literal | TokenKind.Quoted | TokenKind.PropertyAccess | TokenKind.Range | TokenKind.FilteredValue
+  return (getKind(val) & 5763) > 0
 }
 
 function getKind (val: any) {

test/integration/filters/array.spec.ts

@@ -288,6 +288,9 @@ describe('filters/array', function () {
     it('should slice substr by -2,2', () => test('{{ "abc" | slice: -2, 2 }}', 'bc'))
     it('should support array', () => test('{{ "1,2,3,4" | split: "," | slice: 1,2 | join }}', '2 3'))
     it('should return empty array for nil value', () => test('{{ nil | slice: 0 }}', ''))
+    it('should return empty when begin is out of negative range', () => test('{{ "hello" | slice: -10, 2 }}', ''))
+    it('should return empty when length is negative', () => test('{{ "Liquid" | slice: 1, -2 }}', ''))
+    it('should return empty array when begin is out of negative range', () => test('{{ "1,2,3,4,5" | split: "," | slice: -10, 2 | join: "," }}', ''))
   })
   describe('sort', function () {
     it('should support sort', function () {

test/integration/filters/date.spec.ts

@@ -140,6 +140,18 @@ describe('filters/date', function () {
     it('should support timezone name argument when DST is active', function () {
       return test('{{ "2021-06-01T23:00:00Z" | date: "%Y-%m-%dT%H:%M:%S", "America/New_York" }}', '2021-06-01T19:00:00')
     })
+    it('should not shift %s by the timezone name argument', function () {
+      return test('{{ "2026-06-30T21:00:00Z" | date: "%s", "America/Toronto" }}', '1782853200')
+    })
+    it('should not shift %s by the timezone offset argument', function () {
+      return test('{{ "2026-06-30T21:00:00Z" | date: "%s", 360 }}', '1782853200')
+    })
+    it('should not shift %s by the timezoneOffset option', function () {
+      return test('{{ "2026-06-30T21:00:00Z" | date: "%s" }}', '1782853200', undefined, opts)
+    })
+    it('should truncate %s toward the epoch like Ruby strftime', function () {
+      return test('{{ "2026-06-30T17:00:00.500Z" | date: "%s" }}', '1782838800')
+    })
     it('should offset date literal with timezone 00:00 specified', function () {
       return test('{{ "1990-12-31T23:00:00+00:00" | date: "%Y-%m-%dT%H:%M:%S"}}', '1990-12-31T17:00:00', undefined, opts)
     })

test/integration/filters/string.spec.ts

@@ -153,6 +153,26 @@ describe('filters/string', function () {
             '{{ string_with_newlines | strip_newlines }}',
     'Hellothere')
   })
+  describe('squish', function () {
+    it('should collapse whitespace between words', function () {
+      return test('{{ "Hello   World!" | squish }}', 'Hello World!')
+    })
+    it('should strip leading and trailing whitespace', function () {
+      return test('{{ "  HelloWorld!  " | squish }}', 'HelloWorld!')
+    })
+    it('should treat newlines and tabs as whitespace', function () {
+      return test('{{ " \n\t\r\nHello  \n\t World!  \n" | squish }}', 'Hello World!')
+    })
+    it('should return empty string for whitespace only', function () {
+      return test('{{ " \n\t " | squish }}', '')
+    })
+    it('should stringify a number', function () {
+      return test('{{ 5 | squish }}', '5')
+    })
+    it('should return empty string for undefined', function () {
+      return test('{{ nosuchthing | squish }}', '')
+    })
+  })
   describe('truncate', function () {
     it('should truncate when string too long', function () {
       return test('{{ "Ground control to Major Tom." | truncate: 20 }}',

test/integration/filters/url.spec.ts

@@ -7,6 +7,14 @@ describe('filters/url', () => {
       const html = liquid.parseAndRenderSync('{{ "%27Stop%21%27+said+Fred" | url_decode }}')
       expect(html).toEqual("'Stop!' said Fred")
     })
+    it('should decode %2B to a literal plus', () => {
+      const html = liquid.parseAndRenderSync('{{ "1%2B1" | url_decode }}')
+      expect(html).toEqual('1+1')
+    })
+    it('should keep a literal plus when round-tripped through url_encode', () => {
+      const html = liquid.parseAndRenderSync('{{ "a+b c" | url_encode | url_decode }}')
+      expect(html).toEqual('a+b c')
+    })
   })
 
   describe('url_encode', () => {

test/integration/liquid/register-filters.spec.ts

@@ -1,4 +1,4 @@
-import { Liquid } from '../../../src/liquid'
+import { Liquid, filters } from '../../../src'
 
 describe('liquid#registerFilter()', function () {
   let liquid: Liquid
@@ -67,3 +67,32 @@ describe('liquid#registerFilter()', function () {
     await expect(new Liquid({ strictFilters: true }).parseAndRender('{{ 1 | constructor }}')).rejects.toThrow('undefined filter')
   })
 })
+
+describe('liquid#unregisterFilter()', function () {
+  let liquid: Liquid
+  beforeEach(() => { liquid = new Liquid() })
+
+  it('should unregister a custom filter', async () => {
+    liquid.registerFilter('greet', value => `hello ${value}`)
+    liquid.unregisterFilter('greet')
+    const html = await liquid.parseAndRender('{{ "world" | greet }}')
+    return expect(html).toBe('world')
+  })
+
+  it('should unregister a built-in filter', () => {
+    liquid = new Liquid({ strictFilters: true })
+    liquid.unregisterFilter('upcase')
+    return expect(liquid.parseAndRender('{{ "foo" | upcase }}')).rejects.toThrow('undefined filter: upcase')
+  })
+
+  it('should support re-registering a built-in filter', async () => {
+    liquid.unregisterFilter('upcase')
+    liquid.registerFilter('upcase', filters.upcase)
+    const html = await liquid.parseAndRender('{{ "foo" | upcase }}')
+    return expect(html).toBe('FOO')
+  })
+
+  it('should not throw for an unknown filter', () => {
+    expect(() => liquid.unregisterFilter('unknown')).not.toThrow()
+  })
+})

test/integration/static_analysis/variables.spec.ts

@@ -1085,4 +1085,24 @@ describe('Variable analysis', () => {
       locals: { y: [new Variable(['y'], { row: 1, col: 11, file: 'a' })] }
     })
   })
+
+  describe('grouped expressions', () => {
+    const ge = new Liquid({ groupedExpressions: true })
+
+    it('should report variables inside a grouped output expression', () => {
+      const analysis = analyzeSync(ge.parse('{{ (a | append: b) }}'))
+      expect(Object.keys(analysis.variables).sort()).toStrictEqual(['a', 'b'])
+    })
+
+    it('should report variables inside a grouped condition', () => {
+      const analysis = analyzeSync(ge.parse('{% if (a | append: b) == c %}{% endif %}'))
+      expect(Object.keys(analysis.globals).sort()).toStrictEqual(['a', 'b', 'c'])
+    })
+
+    it('should separate locals from globals for grouped assign', () => {
+      const analysis = analyzeSync(ge.parse('{% assign x = (a | upcase) %}{{ x }}'))
+      expect(Object.keys(analysis.globals)).toStrictEqual(['a'])
+      expect(Object.keys(analysis.locals)).toStrictEqual(['x'])
+    })
+  })
 })

test/integration/tags/assign.spec.ts

@@ -99,4 +99,13 @@ describe('tags/assign', function () {
     const html = liquid.parseAndRenderSync(src)
     return expect(html).toBe('bar')
   })
+  describe('grouped expressions', function () {
+    const ge = new Liquid({ groupedExpressions: true })
+    it('should assign a grouped expression', async () => {
+      expect(await ge.parseAndRender('{% assign x = (name | upcase) %}{{ x }}', { name: 'bar' })).toBe('BAR')
+    })
+    it('should assign a grouped range', async () => {
+      expect(await ge.parseAndRender('{% assign x = (1..(items | size)) %}{{ x }}', { items: ['a', 'b', 'c'] })).toBe('123')
+    })
+  })
 })

test/integration/tags/case.spec.ts

@@ -132,4 +132,30 @@ describe('tags/case', function () {
       TRUE
     `)
   })
+  describe('parenthesized filter chains', function () {
+    describe('when enabled', () => {
+      const ge = new Liquid({ groupedExpressions: true })
+      it('should support grouped expression in case value', () => {
+        const src = '{% case (status | downcase) %}{% when "active" %}active{% when "pending" %}pending{% else %}other{% endcase %}'
+        const html = ge.parseAndRenderSync(src, { status: 'ACTIVE' })
+        expect(html).toBe('active')
+      })
+      it('should support grouped expression in when value', () => {
+        const src = '{% case status %}{% when (expected | downcase) %}match{% else %}no match{% endcase %}'
+        const html = ge.parseAndRenderSync(src, { status: 'active', expected: 'ACTIVE' })
+        expect(html).toBe('match')
+      })
+    })
+    describe('when disabled', () => {
+      const ge = new Liquid({ groupedExpressions: false })
+      it('should throw error for grouped expression in case value', () => {
+        const src = '{% case (status | downcase) %}{% when "active" %}active{% when "pending" %}pending{% else %}other{% endcase %}'
+        expect(() => ge.parseAndRenderSync(src, { status: 'ACTIVE' })).toThrow('invalid range syntax')
+      })
+      it('should throw error for grouped expression in when value', () => {
+        const src = '{% case status %}{% when (expected | downcase) %}match{% else %}no match{% endcase %}'
+        expect(() => ge.parseAndRenderSync(src, { status: 'active', expected: 'ACTIVE' })).toThrow('invalid range syntax')
+      })
+    })
+  })
 })

test/integration/tags/echo.spec.ts

@@ -36,4 +36,14 @@ describe('tags/echo', function () {
     const html = await liquid.parseAndRender(src, { user: { name: 'Sally' } })
     return expect(html).toBe('Hello, SALLY!')
   })
+
+  describe('grouped expressions', function () {
+    const ge = new Liquid({ groupedExpressions: true })
+    it('should echo a grouped expression', async () => {
+      expect(await ge.parseAndRender('{% echo (name | upcase) %}', { name: 'bar' })).toBe('BAR')
+    })
+    it('should render a grouped expression in an output statement', async () => {
+      expect(await ge.parseAndRender('{{ (name | upcase | append: "!") }}', { name: 'bar' })).toBe('BAR!')
+    })
+  })
 })

test/integration/tags/for.spec.ts

@@ -426,4 +426,21 @@ describe('tags/for', function () {
       return expect(html).toBe('i-someDrop i-someDrop i-someDrop ')
     })
   })
+  describe('parenthesized filter chains', function () {
+    describe('when enabled', function () {
+      const ge = new Liquid({ groupedExpressions: true })
+      it('should support range with filtered RHS', function () {
+        const src = '{% for i in (1..(items | size)) %}{{i}} {% endfor %}'
+        const html = ge.parseAndRenderSync(src, { items: ['a', 'b', 'c'] })
+        expect(html).toBe('1 2 3 ')
+      })
+    })
+    describe('when disabled', function () {
+      const ge = new Liquid({ groupedExpressions: false })
+      it('should throw for range with filtered RHS', function () {
+        const src = '{% for i in (1..(items | size)) %}{{i}} {% endfor %}'
+        expect(() => ge.parseAndRenderSync(src, { items: ['a', 'b', 'c'] })).toThrow('invalid range syntax')
+      })
+    })
+  })
 })

test/integration/tags/if.spec.ts

@@ -169,4 +169,84 @@ describe('tags/if', function () {
     expect(() => liquid.parseAndRenderSync('{% if false %}{% else %}{% elsif true %}{% endif %}'))
       .toThrow(`unexpected elsif after else`)
   })
+  describe('parenthesized filter chains', function () {
+    describe('when enabled', function () {
+      const ge = new Liquid({ groupedExpressions: true })
+      it('should support (foo | upcase) == "BAR"', async function () {
+        const src = '{% if (foo | upcase) == "BAR" %}yes{% else %}no{% endif %}'
+        const html = await ge.parseAndRender(src, { foo: 'bar' })
+        return expect(html).toBe('yes')
+      })
+      it('should support both sides parenthesized', async function () {
+        const src = '{% if (a | upcase) == (b | upcase) %}yes{% else %}no{% endif %}'
+        const html = await ge.parseAndRender(src, { a: 'hi', b: 'hi' })
+        return expect(html).toBe('yes')
+      })
+      it('should support with logical operators', async function () {
+        const src = '{% if (a | upcase) == "FOO" and (b | downcase) == "bar" %}yes{% else %}no{% endif %}'
+        const html = await ge.parseAndRender(src, { a: 'foo', b: 'BAR' })
+        return expect(html).toBe('yes')
+      })
+      it('should support standalone parenthesized filter via evalValueSync', function () {
+        const result = ge.evalValueSync('(foo | upcase)', { foo: 'bar' })
+        return expect(result).toBe('BAR')
+      })
+      it('should support comparison via evalValueSync', function () {
+        const result = ge.evalValueSync('(foo | upcase) == "BAR"', { foo: 'bar' })
+        return expect(result).toBe(true)
+      })
+      it('should keep range syntax working', function () {
+        const result = ge.evalValueSync('(1..5)', {})
+        return expect(result).toEqual([1, 2, 3, 4, 5])
+      })
+      it('should support chained filters in condition', async function () {
+        const src = '{% if (name | downcase | size) > 3 %}long{% else %}short{% endif %}'
+        const html = await ge.parseAndRender(src, { name: 'Alice' })
+        return expect(html).toBe('long')
+      })
+      it('should support real parenthesis grouping with comparisons and and', async function () {
+        const src = '{% if (((name | downcase | size) > 3) and (one < three)) %}long{% else %}short{% endif %}'
+        const html = await ge.parseAndRender(src, { name: 'Alice', one: 1, three: 3 })
+        return expect(html).toBe('long')
+      })
+      it('should support nested parenthesized expressions in if condition', async function () {
+        const src = '{% if ((foo | append: "!") | upcase) == "BAR!" %}match{% else %}no match{% endif %}'
+        const html = await ge.parseAndRender(src, { foo: 'bar' })
+        return expect(html).toBe('match')
+      })
+      it('should support or with grouped operands', async function () {
+        const src = '{% if (a | upcase) == "X" or (b | upcase) == "B" %}yes{% else %}no{% endif %}'
+        expect(await ge.parseAndRender(src, { a: 'z', b: 'b' })).toBe('yes')
+      })
+      it('should support not with a grouped operand', async function () {
+        const src = '{% if not (a | upcase) == "B" %}no{% else %}yes{% endif %}'
+        expect(await ge.parseAndRender(src, { a: 'b' })).toBe('yes')
+      })
+      it('should support contains with a grouped operand', async function () {
+        const src = '{% if (csv | split: ",") contains "b" %}yes{% else %}no{% endif %}'
+        expect(await ge.parseAndRender(src, { csv: 'a,b,c' })).toBe('yes')
+      })
+      it('should support property access on a grouped result', function () {
+        expect(ge.evalValueSync('(items | first).name', { items: [{ name: 'Sally' }] })).toBe('Sally')
+      })
+      it('should support a grouped expression inside a bracket index', function () {
+        expect(ge.evalValueSync('arr[(i | plus: 1)]', { arr: [10, 20, 30], i: 1 })).toBe(30)
+      })
+      it('should support an async filter inside a grouped expression', async function () {
+        ge.registerFilter('asyncUpcase', (v: string) => Promise.resolve(String(v).toUpperCase()))
+        const src = '{% if (name | asyncUpcase) == "BAR" %}yes{% else %}no{% endif %}'
+        expect(await ge.parseAndRender(src, { name: 'bar' })).toBe('yes')
+      })
+    })
+    describe('when disabled', function () {
+      const ge = new Liquid({ groupedExpressions: false })
+      it('should throw for parenthesized filter in condition', () => {
+        const src = '{% if (foo | upcase) == "BAR" %}yes{% else %}no{% endif %}'
+        expect(() => ge.parseAndRenderSync(src, { foo: 'bar' })).toThrow('invalid range syntax')
+      })
+      it('should throw for parenthesized filter via evalValueSync', () => {
+        expect(() => ge.evalValueSync('(foo | upcase)', { foo: 'bar' })).toThrow('invalid range syntax')
+      })
+    })
+  })
 })

test/integration/tags/unless.spec.ts

@@ -83,4 +83,21 @@ describe('tags/unless', function () {
       expect(html).toBe('yes')
     })
   })
+  describe('parenthesized filter chains', function () {
+    describe('when enabled', function () {
+      const ge = new Liquid({ groupedExpressions: true })
+      it('should support grouped expression in unless condition', function () {
+        const src = '{% unless (content | size) == 0 %}has content{% else %}empty{% endunless %}'
+        const html = ge.parseAndRenderSync(src, { content: 'hello' })
+        expect(html).toBe('has content')
+      })
+    })
+    describe('when disabled', function () {
+      const ge = new Liquid({ groupedExpressions: false })
+      it('should throw for grouped expression in unless condition', function () {
+        const src = '{% unless (content | size) == 0 %}has content{% else %}empty{% endunless %}'
+        expect(() => ge.parseAndRenderSync(src, { content: 'hello' })).toThrow('invalid range syntax')
+      })
+    })
+  })
 })