From 936df70daa1d0987f988094aadffb81fba24d2e1 Mon Sep 17 00:00:00 2001
From: Felix Krause <contact@flyx.org>
Date: Tue, 10 Jan 2017 11:45:55 +0100
Subject: [PATCH] Correctly present empty collections in block-only.

 * Fixes #33
---
 yaml/presenter.nim | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/yaml/presenter.nim b/yaml/presenter.nim
index ad59f59..80879da 100644
--- a/yaml/presenter.nim
+++ b/yaml/presenter.nim
@@ -554,7 +554,11 @@ proc doPresent(s: var YamlStream, target: PresenterTarget,
                              "Cannot have sequence as map key in JSON output!")
         nextState = dFlowSequenceStart
       of psMinimal, psCanonical: nextState = dFlowSequenceStart
-      of psBlockOnly: nextState = dBlockSequenceItem
+      of psBlockOnly:
+        yAssert(not s.finished())
+        let next = s.peek()
+        if next.kind == yamlEndSeq: nextState = dFlowSequenceStart
+        else: nextState = dBlockSequenceItem
 
       if levels.len == 0:
         case nextState
@@ -605,7 +609,11 @@ proc doPresent(s: var YamlStream, target: PresenterTarget,
           raise newException(YamlPresenterJsonError,
                              "Cannot have map as map key in JSON output!")
         nextState = dFlowMapStart
-      of psBlockOnly: nextState = dBlockMapValue
+      of psBlockOnly:
+        yAssert(not s.finished())
+        let next = s.peek()
+        if next.kind == yamlEndMap: nextState = dFlowMapStart
+        else: nextState = dBlockMapValue
       if levels.len == 0:
         case nextState
         of dBlockMapValue: