fix(lexer): Reset flow-key flag on comma in flow collection (fixes eemeli#316)

Author: eemeli

src/parse/lexer.ts

@@ -405,8 +405,11 @@ export class Lexer {
       }
     }
     let n = 0
-    while (line[n] === ',')
-      n += (yield* this.pushCount(1)) + (yield* this.pushSpaces(true))
+    while (line[n] === ',') {
+      n += yield* this.pushCount(1)
+      n += yield* this.pushSpaces(true)
+      this.flowKey = false
+    }
     n += yield* this.pushIndicators()
     switch (line[n]) {
       case undefined:

tests/lexer.ts

@@ -16,3 +16,9 @@ test('plain scalar + CRLF + comment', () => {
   const res = Array.from(new Lexer().lex(src))
   expect(res).toEqual(['\u0002', '\u001f', 'foo', '\r\n', '# bar'])
 })
+
+test('Scalar starting with : after flow-ish key in preceding node in flow collection', () => {
+  const src = '[[], :@]'
+  const res = Array.from(new Lexer().lex(src))
+  expect(res).toEqual(['\u0002', '[', '[', ']', ',', ' ', '\u001f', ':@', ']'])
+})