fix: "filter is not a function" for uniq

Author: harttle

src/context/context.ts

@@ -3,7 +3,7 @@ import { Drop } from '../drop/drop'
 import { __assign } from 'tslib'
 import { NormalizedFullOptions, defaultOptions, RenderOptions } from '../liquid-options'
 import { Scope } from './scope'
-import { isArray, isNil, isUndefined, isString, isFunction, toLiquid, InternalUndefinedVariableError, toValueSync, isObject, Limiter } from '../util'
+import { hasOwnProperty, isArray, isNil, isUndefined, isString, isFunction, toLiquid, InternalUndefinedVariableError, toValueSync, isObject, Limiter } from '../util'
 
 type PropertyKey = string | number;
 
@@ -133,7 +133,7 @@ export function readProperty (obj: Scope, key: PropertyKey, ownPropertyOnly: boo
   return value
 }
 export function readJSProperty (obj: Scope, key: PropertyKey, ownPropertyOnly: boolean) {
-  if (ownPropertyOnly && !Object.hasOwnProperty.call(obj, key) && !(obj instanceof Drop)) return undefined
+  if (ownPropertyOnly && !hasOwnProperty.call(obj, key) && !(obj instanceof Drop)) return undefined
   return obj[key]
 }
 
@@ -148,7 +148,7 @@ function readLast (obj: Scope) {
 }
 
 function readSize (obj: Scope) {
-  if (obj.hasOwnProperty('size') || obj['size'] !== undefined) return obj['size']
+  if (hasOwnProperty.call(obj, 'size') || obj['size'] !== undefined) return obj['size']
   if (isArray(obj) || isString(obj)) return obj.length
   if (typeof obj === 'object') return Object.keys(obj).length
 }

src/filters/array.ts

@@ -1,4 +1,4 @@
-import { toArray, argumentsToValue, toValue, stringify, caseInsensitiveCompare, isArray, isNil, last as arrayLast, hasOwnProperty } from '../util'
+import { toArray, argumentsToValue, toValue, stringify, caseInsensitiveCompare, isArray, isNil, last as arrayLast } from '../util'
 import { equals, evalToken, isTruthy } from '../render'
 import { Value, FilterImpl } from '../template'
 import { Tokenizer } from '../parser'
@@ -187,14 +187,9 @@ export function * find_exp<T extends object> (this: FilterImpl, arr: T[], itemNa
 }
 
 export function uniq<T> (this: FilterImpl, arr: T[]): T[] {
-  arr = toValue(arr)
+  arr = toArray(arr)
   this.context.memoryLimit.use(arr.length)
-  const u = {}
-  return (arr || []).filter(val => {
-    if (hasOwnProperty.call(u, String(val))) return false
-    u[String(val)] = true
-    return true
-  })
+  return [...new Set(arr)]
 }
 
 export function sample<T> (this: FilterImpl, v: T[] | string, count = 1): T | string | (T | string)[] {

src/util/limiter.ts

@@ -1,4 +1,5 @@
 import { assert } from './assert'
+import { toNumber } from './underscore'
 
 export class Limiter {
   private message: string
@@ -9,10 +10,12 @@ export class Limiter {
     this.limit = limit
   }
   use (count: number) {
+    count = toNumber(count)
     assert(this.base + count <= this.limit, this.message)
     this.base += count
   }
   check (count: number) {
+    count = toNumber(count)
     assert(count <= this.limit, this.message)
   }
 }

src/util/underscore.ts

@@ -66,6 +66,11 @@ export function toValue (value: any): any {
   return (value instanceof Drop && isFunction(value.valueOf)) ? value.valueOf() : value
 }
 
+export function toNumber (value: any): number {
+  value = Number(value)
+  return isNaN(value) ? 0 : value
+}
+
 export function isNumber (value: any): value is number {
   return typeof value === 'number'
 }

test/e2e/issues.spec.ts

@@ -496,9 +496,14 @@ describe('Issues', function () {
     expect(() => liquid.parse({} as any)).not.toThrow()
   })
   it('Unexpected "RenderError: memory alloc limit exceeded" #737', () => {
-    const liquid = new Liquid();
-    const context = { x: ["a", "b"] };
-    const template = "{{ x | join: 5 }}"
+    const liquid = new Liquid()
+    const context = { x: ['a', 'b'] }
+    const template = '{{ x | join: 5 }}'
     expect(liquid.parseAndRender(template, context)).resolves.toEqual('a5b')
   })
+  it('{{ 123 | uniq }} throws #737', () => {
+    const liquid = new Liquid()
+    expect(liquid.parseAndRender('{{ 113 | uniq }}')).resolves.toEqual('113')
+    expect(liquid.parseAndRender("{{ '113' | uniq }}")).resolves.toEqual('113')
+  })
 })