Add syntax highlighting to the code snippets in the tutorial

Using the CodeMirror Rust mode.

1 files changed, 124 insertions, 0 deletions

diff --git a/doc/tutorial/lib/codemirror-node.js b/doc/tutorial/lib/codemirror-node.js
new file mode 100644
index 00000000000..fac4c076d48
--- /dev/null
+++ b/doc/tutorial/lib/codemirror-node.js
@@ -0,0 +1,124 @@
+exports.htmlEscape = function(text) {
+  var replacements = {"<": "&lt;", ">": "&gt;",
+                      "&": "&amp;", "\"": "&quot;"};
+  return text.replace(/[<>&"]/g, function(character) {
+    return replacements[character];
+  });
+};
+
+exports.splitLines = function(string){return string.split(/\r?\n/);};
+
+// Counts the column offset in a string, taking tabs into account.
+// Used mostly to find indentation.
+function countColumn(string, end) {
+  if (end == null) {
+    end = string.search(/[^\s\u00a0]/);
+    if (end == -1) end = string.length;
+  }
+  for (var i = 0, n = 0; i < end; ++i) {
+    if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);
+    else ++n;
+  }
+  return n;
+}
+
+function StringStream(string) {
+  this.pos = this.start = 0;
+  this.string = string;
+}
+StringStream.prototype = {
+  eol: function() {return this.pos >= this.string.length;},
+  sol: function() {return this.pos == 0;},
+  peek: function() {return this.string.charAt(this.pos);},
+  next: function() {
+    if (this.pos < this.string.length)
+      return this.string.charAt(this.pos++);
+  },
+  eat: function(match) {
+    var ch = this.string.charAt(this.pos);
+    if (typeof match == "string") var ok = ch == match;
+    else var ok = ch && (match.test ? match.test(ch) : match(ch));
+    if (ok) {++this.pos; return ch;}
+  },
+  eatWhile: function(match) {
+    var start = this.pos;
+    while (this.eat(match)){}
+    return this.pos > start;
+  },
+  eatSpace: function() {
+    var start = this.pos;
+    while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
+    return this.pos > start;
+  },
+  skipToEnd: function() {this.pos = this.string.length;},
+  skipTo: function(ch) {
+    var found = this.string.indexOf(ch, this.pos);
+    if (found > -1) {this.pos = found; return true;}
+  },
+  backUp: function(n) {this.pos -= n;},
+  column: function() {return countColumn(this.string, this.start);},
+  indentation: function() {return countColumn(this.string);},
+  match: function(pattern, consume, caseInsensitive) {
+    if (typeof pattern == "string") {
+      function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}
+      if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
+        if (consume !== false) this.pos += pattern.length;
+        return true;
+      }
+    }
+    else {
+      var match = this.string.slice(this.pos).match(pattern);
+      if (match && consume !== false) this.pos += match[0].length;
+      return match;
+    }
+  },
+  current: function(){return this.string.slice(this.start, this.pos);}
+};
+exports.StringStream = StringStream;
+
+exports.startState = function(mode, a1, a2) {
+  return mode.startState ? mode.startState(a1, a2) : true;
+};
+
+var modes = {}, mimeModes = {};
+exports.defineMode = function(name, mode) { modes[name] = mode; };
+exports.defineMIME = function(mime, spec) { mimeModes[mime] = spec; };
+exports.getMode = function(options, spec) {
+  if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
+    spec = mimeModes[spec];
+  if (typeof spec == "string")
+    var mname = spec, config = {};
+  else if (spec != null)
+    var mname = spec.name, config = spec;
+  var mfactory = modes[mname];
+  if (!mfactory) throw new Error("Unknown mode: " + spec);
+  return mfactory(options, config || {});
+};
+
+exports.runMode = function(string, modespec, callback) {
+  var mode = exports.getMode({indentUnit: 2}, modespec);
+  var isNode = callback.nodeType == 1;
+  if (isNode) {
+    var node = callback, accum = [];
+    callback = function(string, style) {
+      if (string == "\n")
+        accum.push("<br>");
+      else if (style)
+        accum.push("<span class=\"cm-" + exports.htmlEscape(style) + "\">" + exports.htmlEscape(string) + "</span>");
+      else
+        accum.push(exports.htmlEscape(string));
+    }
+  }
+  var lines = exports.splitLines(string), state = exports.startState(mode);
+  for (var i = 0, e = lines.length; i < e; ++i) {
+    if (i) callback("\n");
+    var stream = new exports.StringStream(lines[i]);
+    while (!stream.eol()) {
+      var style = mode.token(stream, state);
+      callback(stream.current(), style, i, stream.start);
+      stream.start = stream.pos;
+    }
+  }
+  if (isNode)
+    node.innerHTML = accum.join("");
+};