Support standard Preserves text encoding as well as JSON

.gitignore

@@ -1,2 +1,3 @@
 /nim.cfg
-/tests/*.run
+*.html
+*.run

preserves.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version = "20231020"
+version = "20231021"
 author        = "Emery Hemingway"
 description   = "data model and serialization format"
 license       = "Unlicense"

src/preserves.nim

@@ -1392,7 +1392,9 @@ proc getOrDefault*[T, V](pr: Preserve[T]; key: string; default: V): V =
         else: break
   default
 
-proc writeText*[E](stream: Stream; pr: Preserve[E]) =
+type TextMode* = enum textPreserves, textJson
+
+proc writeText*[E](stream: Stream; pr: Preserve[E]; mode = textPreserves) =
   ## Encode Preserves to a `Stream` as text.
   if pr.embedded: write(stream, "#!")
   case pr.kind:
@@ -1456,36 +1458,52 @@ proc writeText*[E](stream: Stream; pr: Preserve[E]) =
   of pkRecord:
     assert(pr.record.len > 0)
     write(stream, '<')
-    writeText(stream, pr.record[pr.record.high])
+    writeText(stream, pr.record[pr.record.high], mode)
     for i in 0..<pr.record.high:
       write(stream, ' ')
-      writeText(stream, pr.record[i])
+      writeText(stream, pr.record[i], mode)
     write(stream, '>')
   of pkSequence:
     write(stream, '[')
-    var insertComma: bool
-    for val in pr.sequence:
-      if insertComma: write(stream, ',')
-      else: insertComma = true
-      writeText(stream, val)
+    var insertSeperator: bool
+    case mode
+    of textPreserves:
+      for val in pr.sequence:
+        if insertSeperator: write(stream, ' ')
+        else: insertSeperator = true
+        writeText(stream, val, mode)
+    of textJson:
+      for val in pr.sequence:
+        if insertSeperator: write(stream, ',')
+        else: insertSeperator = true
+        writeText(stream, val, mode)
     write(stream, ']')
   of pkSet:
     write(stream, "#{")
-    var insertWhitespace: bool
+    var insertSeperator: bool
     for val in pr.set.items:
-      if insertWhitespace: write(stream, ' ')
-      else: insertWhitespace = true
-      writeText(stream, val)
+      if insertSeperator: write(stream, ' ')
+      else: insertSeperator = true
+      writeText(stream, val, mode)
     write(stream, '}')
   of pkDictionary:
     write(stream, '{')
-    var insertComma: bool
-    for (key, value) in pr.dict.items:
-      if insertComma: write(stream, ',')
-      else: insertComma = true
-      writeText(stream, key)
-      write(stream, ":")
-      writeText(stream, value)
+    var insertSeperator: bool
+    case mode
+    of textPreserves:
+      for (key, value) in pr.dict.items:
+        if insertSeperator: write(stream, ' ')
+        else: insertSeperator = true
+        writeText(stream, key, mode)
+        write(stream, ": ")
+        writeText(stream, value, mode)
+    of textJson:
+      for (key, value) in pr.dict.items:
+        if insertSeperator: write(stream, ',')
+        else: insertSeperator = true
+        writeText(stream, key, mode)
+        write(stream, ':')
+        writeText(stream, value, mode)
     write(stream, '}')
   of pkEmbedded:
     write(stream, "#!")
@@ -1497,7 +1515,7 @@ proc writeText*[E](stream: Stream; pr: Preserve[E]) =
 proc `$`*[E](pr: Preserve[E]): string =
   ## Generate the textual representation of ``pr``.
   var stream = newStringStream()
-  writeText(stream, pr)
+  writeText(stream, pr, textPreserves)
   result = move stream.data
 
 include ./preserves/private/parse

src/preserves/schemaparse.nim

@@ -300,4 +300,4 @@ when isMainModule:
     let
       scm = parsePreservesSchema(txt)
       pr = toPreserve scm
-    stdout.newFileStream.writeText pr
+    stdout.newFileStream.writeText(pr, textPreserves)

tests/Tupfile

@@ -1,2 +1,2 @@
 include_rules
-: foreach t*.nim |> !nim_run |>
+: foreach t*.nim |> !nim_run |> | ../<test>