Better interface for loading to JSON

bench/json.nim

@@ -126,33 +126,32 @@ proc genJsonString(size: int, maxStringLen: int): string =
             result.add(s)
             curSize += s.len
 
-var cYaml1k, cYaml10k, cYaml100k, cJson1k, cJson10k, cJson100k: clock
-
-randomize(42)
-let
+var
+    cYaml1k, cYaml10k, cYaml100k, cJson1k, cJson10k, cJson100k: clock
     json1k   = genJsonString(1, 32)
     json10k  = genJsonString(10, 32)
     json100k = genJsonString(100, 32)
-
-var s = newStringStream(json1k)
+    parser = newParser(coreTagLibrary())
+    
+    s = newStringStream(json1k)
 
 block:
     bench(cYaml1k):
-        let res = parseToJson(s)
+        let res = constructJson(parser.parse(s))
         assert res[0].kind == JObject
 
 s = newStringStream(json10k)
 
 block:
     bench(cYaml10k):
-        let res = parseToJson(s)
+        let res = constructJson(parser.parse(s))
         assert res[0].kind == JObject
 
 s = newStringStream(json100k)
 
 block:
     bench(cYaml100k):
-        let res = parseToJson(s)
+        let res = constructJson(parser.parse(s))
         assert res[0].kind == JObject
 
 block:

private/json.nim

@@ -62,19 +62,14 @@ proc jsonFromScalar(content: string, tag: TagId,
         result.kind = JString
         result.str = content
 
-proc parseToJson*(s: string): seq[JsonNode] =
-    result = parseToJson(newStringStream(s))
-
-proc parseToJson*(s: Stream): seq[JsonNode] =
+proc constructJson*(s: YamlStream): seq[JsonNode] =
     newSeq(result, 0)
     
     var
         levels  = newSeq[Level]()
-        parser  = newParser(coreTagLibrary())
-        events  = parser.parse(s)
         anchors = initTable[AnchorId, JsonNode]()
     
-    for event in events():
+    for event in s():
         case event.kind
         of yamlStartDocument:
             # we don't need to do anything here; root node will be created

yaml.nim

@@ -296,11 +296,12 @@ proc anchor*(parser: YamlSequentialParser, id: AnchorId): string
 proc parse*(parser: YamlSequentialParser, s: Stream): YamlStream
     ## Parse a YAML character stream. ``s`` must be readable.
 
-proc parseToJson*(s: Stream): seq[JsonNode]
-    ## Parse a YAML character stream to the standard library's in-memory JSON
-    ## representation. The input may not contain any tags apart from those in
-    ## ``coreTagLibrary``. Anchors and aliases will be resolved. Maps in the
-    ## input must not contain non-scalars as keys.
+proc constructJson*(s: YamlStream): seq[JsonNode]
+    ## Construct an in-memory JSON tree from a YAML event stream. The stream may
+    ## not contain any tags apart from those in  ``coreTagLibrary``. Anchors and
+    ## aliases will be resolved. Maps in the  input must not contain
+    ## non-scalars as keys. Each element of the result represents one document
+    ## in the YAML stream.
     ##
     ## **Warning:** The special float values ``[+-]Inf`` and ``NaN`` will be
     ## parsed into Nim's JSON structure without error. However, they cannot be
@@ -309,9 +310,6 @@ proc parseToJson*(s: Stream): seq[JsonNode]
     ## check for these values and will output invalid JSON when rendering one
     ## of these values into a JSON character stream.
     
-proc parseToJson*(s: string): seq[JsonNode]
-    ## see `parseToJson <#parseToJson,Stream,seq[JsonNode]>`_
-
 proc dump*(s: YamlStream, target: Stream, tagLib: YamlTagLibrary,
            style: YamlDumpStyle = yDumpDefault, indentationStep: int = 2)
     ## Convert ``s`` to a YAML character stream and write it to ``target``.