Updates

packages/bare-os-coreutils/lib/summon-layout.js

@@ -0,0 +1,245 @@
+/** Flow HTML to wrapped lines + link/form hit targets. */
+
+var BARE_SUMMON_BLOCK = {
+  address: 1,
+  article: 1,
+  aside: 1,
+  blockquote: 1,
+  body: 1,
+  div: 1,
+  dl: 1,
+  dt: 1,
+  dd: 1,
+  fieldset: 1,
+  figcaption: 1,
+  figure: 1,
+  footer: 1,
+  form: 1,
+  h1: 1,
+  h2: 1,
+  h3: 1,
+  h4: 1,
+  h5: 1,
+  h6: 1,
+  header: 1,
+  hr: 1,
+  li: 1,
+  main: 1,
+  nav: 1,
+  ol: 1,
+  p: 1,
+  pre: 1,
+  section: 1,
+  table: 1,
+  tr: 1,
+  ul: 1
+}
+
+function bareSummonIsBlock(name, style) {
+  var d = bareSummonDisplay(style)
+  if (d === 'none') return false
+  if (d === 'inline') return false
+  if (d === 'block') return true
+  return !!BARE_SUMMON_BLOCK[name]
+}
+
+function bareSummonLayout(doc, opts) {
+  opts = opts || {}
+  var cols = Math.max(20, opts.cols || 80)
+  var sheets = opts.sheets || []
+  var numbers = opts.numbers !== false
+  var lines = []
+  var links = []
+  var forms = []
+  var cur = ''
+  var curMarks = []
+
+  function flush() {
+    if (cur === '' && !curMarks.length) return
+    lines.push({ text: cur, marks: curMarks })
+    cur = ''
+    curMarks = []
+  }
+
+  function emitNl() {
+    flush()
+  }
+
+  function emitText(s, mark) {
+    s = String(s || '')
+    if (!s) return
+    var i = 0
+    while (i < s.length) {
+      var ch = s.charAt(i)
+      if (ch === '\n') {
+        emitNl()
+        i++
+        continue
+      }
+      if (ch === '\r') {
+        i++
+        continue
+      }
+      if (cur.length >= cols) emitNl()
+      if (mark) {
+        curMarks.push({
+          col: cur.length,
+          ch: ch,
+          link: mark.link,
+          form: mark.form,
+          bold: mark.bold,
+          dim: mark.dim
+        })
+      }
+      cur += ch
+      i++
+    }
+  }
+
+  function emitSpace() {
+    if (cur && cur.charAt(cur.length - 1) !== ' ') emitText(' ')
+  }
+
+  function walk(node, mark) {
+    if (!node) return
+    if (node.type === 'text') {
+      var t = node.text || ''
+      if (!mark || !mark.pre) t = t.replace(/\s+/g, ' ')
+      if (t === ' ' || t === '') {
+        if (t === ' ') emitSpace()
+        return
+      }
+      emitText(t, mark)
+      return
+    }
+    if (node.type !== 'element') return
+    var st = bareSummonComputedStyle(node, sheets)
+    if (bareSummonDisplay(st) === 'none') return
+    var name = node.name
+    var nextMark = {
+      link: mark && mark.link,
+      form: mark && mark.form,
+      bold: mark && mark.bold,
+      dim: mark && mark.dim,
+      pre: mark && mark.pre
+    }
+    if (
+      st['font-weight'] === 'bold' ||
+      name === 'b' ||
+      name === 'strong' ||
+      /^h[1-6]$/.test(name)
+    )
+      nextMark.bold = true
+    if (name === 'pre' || name === 'code' || st['font-family'] === 'monospace')
+      nextMark.dim = true
+    if (name === 'pre' || st['white-space'] === 'pre') nextMark.pre = true
+
+    if (name === 'a' && node.attrs.href) {
+      var id = links.length
+      links.push({
+        id: id,
+        href: node.attrs.href,
+        text: bareSummonTextContent(node).replace(/\s+/g, ' ').trim()
+      })
+      nextMark.link = id
+      if (numbers) emitText('[' + (id + 1) + ']', nextMark)
+    }
+    if (name === 'br') {
+      emitNl()
+      return
+    }
+    if (name === 'hr') {
+      emitNl()
+      emitText('\u2500'.repeat(Math.min(cols, 40)))
+      emitNl()
+      return
+    }
+    if (name === 'img') {
+      var alt = node.attrs.alt || node.attrs.src || 'img'
+      emitText('[IMG ' + alt + ']')
+      return
+    }
+    if (
+      name === 'input' ||
+      name === 'textarea' ||
+      name === 'select' ||
+      name === 'button'
+    ) {
+      var fid = forms.length
+      forms.push({
+        id: fid,
+        name: node.attrs.name || '',
+        type: (node.attrs.type || name).toLowerCase(),
+        value: node.attrs.value || '',
+        node: node
+      })
+      nextMark.form = fid
+      emitText('[' + (node.attrs.type || name) + ']')
+      if (name === 'input' && BARE_SUMMON_VOID[name]) return
+    }
+    if (name === 'iframe' || name === 'video' || name === 'audio') {
+      emitText(
+        '[' +
+          name.toUpperCase() +
+          (node.attrs.src ? ' ' + node.attrs.src : '') +
+          ']'
+      )
+      return
+    }
+
+    var block = bareSummonIsBlock(name, st)
+    if (block) emitNl()
+    if (name === 'li') emitText('\u2022 ')
+    var ch = node.children || []
+    for (var i = 0; i < ch.length; i++) walk(ch[i], nextMark)
+    if (block) emitNl()
+  }
+
+  walk(doc.body, {})
+  flush()
+  while (lines.length && !String(lines[0].text || '').trim()) lines.shift()
+  while (lines.length && !String(lines[lines.length - 1].text || '').trim())
+    lines.pop()
+
+  var plain = lines.map(function (l) {
+    return l.text
+  })
+  return {
+    cols: cols,
+    lines: lines,
+    plain: plain,
+    links: links,
+    forms: forms,
+    title: doc.title || ''
+  }
+}
+
+function bareSummonReaderText(doc) {
+  var bits = []
+  function keep(n) {
+    return (
+      n &&
+      n.type === 'element' &&
+      (n.name === 'p' ||
+        n.name === 'h1' ||
+        n.name === 'h2' ||
+        n.name === 'h3' ||
+        n.name === 'li' ||
+        n.name === 'pre' ||
+        n.name === 'blockquote' ||
+        n.name === 'article')
+    )
+  }
+  function walk(n) {
+    if (!n) return
+    if (keep(n)) {
+      var t = bareSummonTextContent(n).replace(/\s+/g, ' ').trim()
+      if (t) bits.push(t)
+      return
+    }
+    var ch = n.children || []
+    for (var i = 0; i < ch.length; i++) walk(ch[i])
+  }
+  walk(doc.body)
+  return bits.join('\n\n')
+}