73 lines
2.1 KiB
Nim
73 lines
2.1 KiB
Nim
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# SPDX-FileCopyrightText: 2021 ☭ Emery Hemingway
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# SPDX-License-Identifier: Unlicense
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import std/[xmltree, strtabs, tables]
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import ../preserves
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proc toPreserveHook*(xn: XmlNode; E: typedesc): Preserve[E] =
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case xn.kind
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of xnElement:
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var children = initSequence[E](xn.len)
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var i: int
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for child in xn.items:
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children[i] = toPreserveHook(child, E)
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inc i
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var attrMap = initDictionary[E]()
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if not xn.attrs.isNil:
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for key, val in xn.attrs.pairs:
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attrMap[toSymbol(key, E)] = toPreserve(val, E)
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result = initRecord[E](xn.tag, attrMap, children)
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of xnText:
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result = toPreserve(xn.text, E)
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of xnVerbatimText:
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result = initRecord[E]("verbatim", xn.text.toPreserve(E))
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of xnComment:
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result = initRecord[E]("comment", xn.text.toPreserve(E))
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of xnCData:
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result = initRecord[E]("cdata", xn.text.toPreserve(E))
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of xnEntity:
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result = initRecord[E]("entity", xn.text.toPreserve(E))
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proc fromPreserveHook*[E](xn: var XmlNode; pr: Preserve[E]): bool =
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case pr.kind:
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of pkString:
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xn = newText(pr.string)
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result = true
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of pkRecord:
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if pr.len == 2 and pr[0].isDictionary and pr[1].isSequence and pr.label.isSymbol:
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xn = newElement(pr[2].symbol)
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result = true
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if pr[0].len > 0:
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var attrs = newStringTable()
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for key, val in pr[0].dict.items:
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if not (key.isSymbol and val.isString):
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result = false
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break
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attrs[key.symbol] = val.string
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xn.attrs = attrs
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var child: XmlNode
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for e in pr[1]:
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result = fromPreserveHook(child, e)
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if not result: break
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xn.add(move child)
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if not result: reset xn
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elif pr.len == 1 and pr.label.isSymbol:
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result = true
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case pr.label.symbol:
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of "verbatim":
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xn = newVerbatimText(pr[0].string)
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of "comment":
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xn = newComment(pr[0].string)
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of "cdata":
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xn = newCData(pr[0].string)
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of "entity":
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xn = newEntity(pr[0].string)
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else:
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result = false
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else: discard
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when isMainModule:
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var xn = XmlNode()
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var pr = xn.toPreserveHook(void)
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assert fromPreserveHook(xn, pr)
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