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annotate src/name/blackcap/clipman/Troff.kt @ 57:c6cccbe2f393

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Port to OpenJDK 15 (mostly done).
author David Barts <n5jrn@me.com>
date Wed, 23 Mar 2022 23:56:29 -0700
parents 22725d4d7849
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1 /*
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2 * Coercion to troff input.
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3 */
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4 package name.blackcap.clipman
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5
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6 import org.jsoup.Jsoup
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7 import org.jsoup.nodes.*
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8 import org.jsoup.select.NodeVisitor
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9
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10 class Troffizer: NodeVisitor {
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11 private enum class Typeface(val pos: Int) {
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12 ROMAN(1),
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13 ITALIC(2),
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14 BOLD(3)
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15 }
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16
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17 private val tfStack = mutableListOf<Typeface>(Typeface.ROMAN);
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18
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19 private val TF_TAGS = mapOf<String, Typeface>(
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20 "em" to Typeface.ITALIC,
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21 "i" to Typeface.ITALIC,
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22 "b" to Typeface.BOLD,
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23 "strong" to Typeface.BOLD)
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24
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25 private val accum = StringBuilder();
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26
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27 override fun head(node: Node, depth: Int): Unit {
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28 when (node) {
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29 is TextNode -> accum.append(node.text())
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30 is Element -> enterElement(node)
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31 }
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32 }
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33
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34 override fun tail(node: Node, depth: Int): Unit {
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35 if (node is Element) {
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36 leaveElement(node)
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37 }
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38 }
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39
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40 private fun enterElement(element: Element) {
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41 var newFace = TF_TAGS[element.normalName()]
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42 if (newFace != null) {
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43 tfStack.add(newFace)
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44 accum.append("\\f")
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45 accum.append(newFace.pos)
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46 }
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47 }
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48
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49 private fun leaveElement(element: Element) {
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50 if (element.normalName() in TF_TAGS) {
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51 tfStack.removeLast()
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52 accum.append("\\f")
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53 accum.append(tfStack.lastOrNull()?.pos ?: Typeface.ROMAN.pos)
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54 }
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55 }
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56
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57 fun getTroff(): String = accum.toString()
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58 }
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59
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60 private fun _troffize(html: String): String {
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61 val troffizer = Troffizer()
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62 Jsoup.parse(html).traverse(troffizer)
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63 return troffizer.getTroff()
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64 }
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65
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66 fun troffize(item: PasteboardItem): Unit {
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67 val (plain, html) = when (item) {
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68 is PasteboardItem.Plain ->
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69 Pair(item.plain, null)
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70 is PasteboardItem.HTML ->
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71 Pair(item.plain, item.html)
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72 is PasteboardItem.RTF ->
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73 Pair(item.plain, item.html)
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74 }
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75 PasteboardItem.write(
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76 PasteboardItem.Plain(
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77 if (html == null) { plain } else { _troffize(html) }))
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78 }