feat: support filters in if/unless/case, see #287

src/template/filter/filter.ts

@@ -17,12 +17,12 @@ export class Filter {
     this.args = args
     this.liquid = liquid
   }
-  public * render (value: any, context: Context) {
+  public render (value: any, context: Context) {
     const argv: any[] = []
     for (const arg of this.args as FilterArg[]) {
-      if (isKeyValuePair(arg)) argv.push([arg[0], yield evalToken(arg[1], context)])
-      else argv.push(yield evalToken(arg, context))
+      if (isKeyValuePair(arg)) argv.push([arg[0], evalToken(arg[1], context)])
+      else argv.push(evalToken(arg, context))
     }
-    return yield this.impl.apply({ context, liquid: this.liquid }, [value, ...argv])
+    return this.impl.apply({ context, liquid: this.liquid }, [value, ...argv])
   }
 }

src/template/output.ts

@@ -1,5 +1,4 @@
 import { Value } from './value'
-import { FilterMap } from './filter/filter-map'
 import { TemplateImpl } from '../template/template-impl'
 import { Template } from '../template/template'
 import { Context } from '../context/context'
@@ -9,12 +8,12 @@ import { Liquid } from '../liquid'
 
 export class Output extends TemplateImpl<OutputToken> implements Template {
   private value: Value
-  public constructor (token: OutputToken, filters: FilterMap, liquid: Liquid) {
+  public constructor (token: OutputToken, liquid: Liquid) {
     super(token)
-    this.value = new Value(token.content, filters, liquid)
+    this.value = new Value(token.content, liquid)
   }
   public * render (ctx: Context, emitter: Emitter) {
-    const val = yield this.value.value(ctx)
+    const val = yield this.value.value(ctx, false)
     emitter.write(val)
   }
 }

src/template/value.ts

@@ -1,27 +1,25 @@
-import { evalToken } from '../render/expression'
+import { Expression } from '../render/expression'
 import { Tokenizer } from '../parser/tokenizer'
-import { FilterMap } from '../template/filter/filter-map'
 import { Filter } from './filter/filter'
 import { Context } from '../context/context'
-import { ValueToken } from '../tokens/value-token'
 import { Liquid } from '../liquid'
 
 export class Value {
   public readonly filters: Filter[] = []
-  public readonly initial?: ValueToken
+  public readonly initial: Expression
 
   /**
    * @param str the value to be valuated, eg.: "foobar" | truncate: 3
    */
-  public constructor (str: string, private readonly filterMap: FilterMap, liquid: Liquid) {
+  public constructor (str: string, liquid: Liquid) {
     const tokenizer = new Tokenizer(str, liquid.options.operatorsTrie)
-    this.initial = tokenizer.readValue()
-    this.filters = tokenizer.readFilters().map(({ name, args }) => new Filter(name, this.filterMap.get(name), args, liquid))
+    this.initial = tokenizer.readExpression()
+    this.filters = tokenizer.readFilters().map(({ name, args }) => new Filter(name, liquid.filters.get(name), args, liquid))
   }
-  public * value (ctx: Context) {
-    const lenient = ctx.opts.lenientIf && this.filters.length > 0 && this.filters[0].name === 'default'
+  public * value (ctx: Context, lenient: boolean) {
+    lenient = lenient || (ctx.opts.lenientIf && this.filters.length > 0 && this.filters[0].name === 'default')
+    let val = yield this.initial.evaluate(ctx, lenient)
 
-    let val = yield evalToken(this.initial, ctx, lenient)
     for (const filter of this.filters) {
       val = yield filter.render(val, ctx)
     }