Various Enhancements for PowerShell Based on highlight.js

[davidhcefx]

Description

There are tools off-the-shelf, so why re-designing all the stuff? Basing on highlight.js, I enhanced the highlighting rules in the following aspects:

The following paragraphs refer to the paragraphs in the source code.

Commands

• Instead of enumerating all possible commands, hightlight.js used a different approach: They listed out all officially-approved verbs, since every PowerShell command is in the form of VERB-NOUN. Therefore, I switched to their method.
• For the old method, commands starting with these verbs would not be highlighted properly:
  • Redo-
  • Search-
  • Skip-
  • Step-
  • Watch-
  • Edit-
  • Merge-
  • Unpublish-
  • Approve-
  • Deny-
  • Request-
  • Submit-
  • Ping-
• There was a buggy rule cd.. in the old method (line 7). Since it was regex, it would highlight cdaa but not cd...
• In addition, I added 157 new built-in aliases, such as clear, kill and copy, basing on highlight.js.

Operators

• Basing on highlight.js, I added 47 more operators, such as -ceq, -clike and -split.

Keywords (aka Statements)

• Basing on highlight.js, I added 28 more keywords, such as try, catch, using and class.

Types

• Types such as string or int were not being highlighted originally.
• Basing on highlight.js, I added 14 new built-in types.

Comments

• There was a bug for block comment. That is, in the following example, Get-Help would be recognized as a comment, but in fact it should not.

  <# comment #> Get-Help

Quoted text

• Here-strings are strings starting with @" or @' and ending with "@ or '@.
• The old rules only consider @-with-double-quotes, but not @-with-single-quotes.

Color-coding convention

• I changed to a more mainstream color-coding convention (eg. Bash), which is the same as PR #357.
  • Strings in yellow, operators in green, and so on.

Summary

To sum up, these are my enhancements:

Before

After

[davidhcefx]

@scopatz ping. Seems like there are plenty of PR awaiting lol.