First Commit

html/sternwarte/checkfuehrung/node_modules/cardinal/lib/highlight.js

@@ -0,0 +1,75 @@
+'use strict'
+
+var redeyed =  require('redeyed')
+var theme   =  require('../themes/default')
+var colors  =  require('ansicolors')
+
+var colorSurround =  colors.brightBlack
+var surroundClose =  '\u001b[39m'
+
+function trimEmptyLines(lines) {
+  // remove lines from the end until we find a non-empy one
+  var line = lines.pop()
+  while (!line || !line.length)    {
+ line = lines.pop()
+}
+
+  // put the non-empty line back
+  if (line) lines.push(line)
+}
+
+function addLinenos(highlightedCode, firstline) {
+  var highlightedLines = highlightedCode.split('\n')
+
+  trimEmptyLines(highlightedLines)
+
+  var linesLen = highlightedLines.length
+  var lines = []
+  var totalDigits
+  var lineno
+
+  function getDigits(n) {
+    if (n < 10) return 1
+    if (n < 100) return 2
+    if (n < 1000) return 3
+    if (n < 10000) return 4
+    // this works for up to 99,999 lines - any questions?
+    return 5
+  }
+
+  function pad(n, totalDigits) {
+    // not pretty, but simple and should perform quite well
+    var padDigits = totalDigits - getDigits(n)
+    switch (padDigits) {
+      case 0: return '' + n
+      case 1: return ' ' + n
+      case 2: return '  ' + n
+      case 3: return '   ' + n
+      case 4: return '    ' + n
+      case 5: return '     ' + n
+    }
+  }
+
+  totalDigits = getDigits(linesLen + firstline - 1)
+
+  for (var i = 0; i < linesLen; i++) {
+    // Don't close the escape sequence here in order to not break multi line code highlights like block comments
+    lineno = colorSurround(pad(i + firstline, totalDigits) + ': ').replace(surroundClose, '')
+    lines.push(lineno + highlightedLines[i])
+  }
+
+  return lines.join('\n')
+}
+
+module.exports = function highlight(code, opts) {
+  opts = opts || { }
+  try {
+    var result = redeyed(code, opts.theme || theme, { jsx: !!opts.jsx })
+    var firstline = opts.firstline && !isNaN(opts.firstline) ? opts.firstline : 1
+
+    return opts.linenos ? addLinenos(result.code, firstline) : result.code
+  } catch (e) {
+    e.message = 'Unable to perform highlight. The code contained syntax errors: ' + e.message
+    throw e
+  }
+}