The 1001 questions about vbRichClient5 (2020-07-21)

[Schmidt]

Just for the experiment I just impl a VbPeg based JS tokenizer w/ the requirements of the RE "competition" but also one that strips whitespace outside of string literals (minifies JS) and it turned quite fast

Nice...

FWIW, here's a performance-improvement for the ActiveScript-JSCode based replacements
(which also corrects a few errors in the reg-expressions):

    With New_c.StringBuilder 
       .AppendNL "'use strict';"
       .AppendNL "var regCmtSngLine1 = /(^\/\/.*?(\r|\n))/gm ;"
       .AppendNL "var regCmtSngLine2 = /(?!([""']([^\\[""']]*).*[""'])).(\/\/.*?(\r|\n))/g ;"
       .AppendNL "var regCmtMultiLine = /(\/\*[\w\'\s\r\n\*]*\*\/)/g ;"
 
       .AppendNL "var regLet = /^\s*[\{\(]*let \b/gm ;"
       .AppendNL "var regEmptyLines = /^\s*[\r\n]/gm ;"
 
       .AppendNL "function CompressJavaScript(code){"
       .AppendNL "  return code"
       .AppendNL "         .replace(regCmtSngLine1,'')"
       .AppendNL "         .replace(regCmtSngLine2,'')"
       .AppendNL "         .replace(regCmtMultiLine,'')"
       .AppendNL "         .replace(regLet,'var ')"
       .AppendNL "         .replace(regEmptyLines,'')"
       .AppendNL "}"
       mSC.AddCode .ToString
    End With

With these changes it is now faster than the (VB)Scripting-Regex-Code -
(also note, that "JScript" works - surprisingly - a bit faster than the newer "JScript9" engine).

Olaf