// Copyright (C) 2010 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview
* Registers a language handler for the Go language..
* <p>
* Based on the lexical grammar at
* http://golang.org/doc/go_spec.html#Lexical_elements
* <p>
* Go uses a minimal style for highlighting so the below does not distinguish
* strings, keywords, literals, etc. by design.
* From a discussion with the Go designers:
* <pre>
* On Thursday, July 22, 2010, Mike Samuel <...> wrote:
* > On Thu, Jul 22, 2010, Rob 'Commander' Pike <...> wrote:
* >> Personally, I would vote for the subdued style godoc presents at http://golang.org
* >>
* >> Not as fancy as some like, but a case can be made it's the official style.
* >> If people want more colors, I wouldn't fight too hard, in the interest of
* >> encouragement through familiarity, but even then I would ask to shy away
* >> from technicolor starbursts.
* >
* > Like http://golang.org/pkg/go/scanner/ where comments are blue and all
* > other content is black? I can do that.
* </pre>
*
* @author mikesamuel@gmail.com
*/
PR['registerLangHandler'](
PR['createSimpleLexer'](
[
// Whitespace is made up of spaces, tabs and newline characters.
[PR['PR_PLAIN'], /^[\t\n\r \xA0]+/, null, '\t\n\r \xA0'],
// Not escaped as a string. See note on minimalism above.
[PR['PR_PLAIN'], /^(?:\"(?:[^\"\\]|\\[\s\S])*(?:\"|$)|\'(?:[^\'\\]|\\[\s\S])+(?:\'|$)|`[^`]*(?:`|$))/, null, '"\'']
],
[
// Block comments are delimited by /* and */.
// Single-line comments begin with // and extend to the end of a line.
[PR['PR_COMMENT'], /^(?:\/\/[^\r\n]*|\/\*[\s\S]*?\*\/)/],
[PR['PR_PLAIN'], /^(?:[^\/\"\'`]|\/(?![\/\*]))+/i]
]),
['go']);
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