Summary

avoid recompilation of regular expressions, at least for simple cases

Metadata

• Id: 16e995e2c9b257d834f2b0c63b072b7780e9992c
• Trac id: 228
• Type: enhancement
• Reporter: felix
• Owner: felix
• Cc:
• Status: closed
• Component: compiler
• Estimated difficulty:
• Resolution: fixed
• Priority: not urgent at all
• Milestone:
• Version:
• Changetime: 2010-05-18 15:28:14 UTC
• Created: 2010-05-04 09:37:25 UTC
• Keywords: regex compilation syntax

Description

Compiler syntax for `string-(search|match)[[-positions]|]` with literal or quoted first argument could transform into code that uses a "latch":

 (string-XXX LIT ...)
 
 ~>
 
 (let* ((T1 '#(#f))
        (T2 (##sys#slot T1 0)))
   (string-XXX
     (or T2
         (let ((T3 (regexp LIT)))
           (##sys#setslot T1 0 T3)
           T3))
     ...))

Changes and comments

[2010-05-18 15:28:14 UTC] felix changed status from new to closed

[2010-05-18 15:28:14 UTC] felix set resolution to fixed

[2010-05-18 15:28:14 UTC] felix wrote:

The internal routine used to canonicalize regular-expression arguments now keeps a global cache which speeds up things considerably (commit 5760e2dc26dcc5cc24a3d09b6042e3acfb49251c, branch experimental).