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package yamlesque
object Writer {
def write(nodes: Iterable[Node]): String = {
val buffer = new StringBuilder
write(nodes, buffer)
buffer.result()
}
def write(nodes: Iterable[Node], buffer: StringBuilder): Unit = {
val it = nodes.iterator
while (it.hasNext) {
writeCompact(buffer, true, 0, it.next())
if (it.hasNext) buffer ++= "---\n"
}
}
private def writeCompact(
buffer: StringBuilder,
startOfLine: Boolean,
indent: Int,
node: Node
): Unit = {
node match {
case Null =>
buffer ++= "null\n"
case Bool(true) =>
buffer ++= "true\n"
case Bool(false) =>
buffer ++= "false\n"
case Num(num) =>
buffer ++= num.toString
buffer += '\n'
case Str(value) =>
buffer ++= value
buffer += '\n'
case Arr(values) =>
var doIndent = startOfLine
for (item <- values) {
if (doIndent) {
buffer ++= " " * indent
}
doIndent = true
item match {
case Arr(_) =>
buffer ++= "-\n"
writeCompact(buffer, true, indent + 1, item)
case _ =>
buffer ++= "- "
writeCompact(buffer, false, indent + 1, item)
}
}
case Obj(values) =>
var doIndent = startOfLine
for ((key, value) <- values) {
if (doIndent) {
buffer ++= " " * indent
}
doIndent = true
buffer ++= key
value match {
case Str(_) | Bool(_) | Num(_) | Null =>
buffer ++= ": "
writeCompact(buffer, false, indent, value)
case _ =>
buffer ++= ":\n"
writeCompact(buffer, true, indent + 1, value)
}
}
}
}
}
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