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1 // Copyright (C) 2010 Google Inc. | |
2 // | |
3 // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 // you may not use this file except in compliance with the License. | |
5 // You may obtain a copy of the License at | |
6 // | |
7 // http://www.apache.org/licenses/LICENSE-2.0 | |
8 // | |
9 // Unless required by applicable law or agreed to in writing, software | |
10 // distributed under the License is distributed on an "AS IS" BASIS, | |
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 // See the License for the specific language governing permissions and | |
13 // limitations under the License. | |
14 | |
15 | |
16 | |
17 /** | |
18 * @fileoverview | |
19 * Registers a language handler for the Go language.. | |
20 * <p> | |
21 * Based on the lexical grammar at | |
22 * http://golang.org/doc/go_spec.html#Lexical_elements | |
23 * <p> | |
24 * Go uses a minimal style for highlighting so the below does not distinguish | |
25 * strings, keywords, literals, etc. by design. | |
26 * From a discussion with the Go designers: | |
27 * <pre> | |
28 * On Thursday, July 22, 2010, Mike Samuel <...> wrote: | |
29 * > On Thu, Jul 22, 2010, Rob 'Commander' Pike <...> wrote: | |
30 * >> Personally, I would vote for the subdued style godoc presents at http://go
lang.org | |
31 * >> | |
32 * >> Not as fancy as some like, but a case can be made it's the official style. | |
33 * >> If people want more colors, I wouldn't fight too hard, in the interest of | |
34 * >> encouragement through familiarity, but even then I would ask to shy away | |
35 * >> from technicolor starbursts. | |
36 * > | |
37 * > Like http://golang.org/pkg/go/scanner/ where comments are blue and all | |
38 * > other content is black? I can do that. | |
39 * </pre> | |
40 * | |
41 * @author mikesamuel@gmail.com | |
42 */ | |
43 | |
44 PR['registerLangHandler']( | |
45 PR['createSimpleLexer']( | |
46 [ | |
47 // Whitespace is made up of spaces, tabs and newline characters. | |
48 [PR['PR_PLAIN'], /^[\t\n\r \xA0]+/, null, '\t\n\r \xA0'], | |
49 // Not escaped as a string. See note on minimalism above. | |
50 [PR['PR_PLAIN'], /^(?:\"(?:[^\"\\]|\\[\s\S])*(?:\"|$)|\'(?:[^\'\\
]|\\[\s\S])+(?:\'|$)|`[^`]*(?:`|$))/, null, '"\''] | |
51 ], | |
52 [ | |
53 // Block comments are delimited by /* and */. | |
54 // Single-line comments begin with // and extend to the end of a line. | |
55 [PR['PR_COMMENT'], /^(?:\/\/[^\r\n]*|\/\*[\s\S]*?\*\/)/], | |
56 [PR['PR_PLAIN'], /^(?:[^\/\"\'`]|\/(?![\/\*]))+/i] | |
57 ]), | |
58 ['go']); | |
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