Changes: Search for a C-style for statement

Revision as of 12:17, 24 July 2007

Please review this tip:

This tip was imported from vim.org and needs general review.
You might clean up comments or merge similar tips.
Add suitable categories so people can find the tip.
Please avoid the discussion page (use the Comments section below for notes).
If the tip contains good advice for current Vim, remove the {{review}} line.

Tip: #1320 - Search for a C-style for statement

Created: September 6, 2006 9:24 Complexity: intermediate Author: MrQBerrt<at>yahoo.com Version: 5.7 Karma: 0/2 Imported from: Tip#1320

Q: How to do a search that will find both of the following examples?

for ( 
  int i=0; 
  i<3; 
  i++ 
)

&

for ( int i=0; i<3; i++)

A: Use this pattern

\<for\>[ ^I\n]\{-0,}([ ^I\n]\{-0,}.*;[ ^I\n]\{-0,}.*;[ ^I\n]\{-0,}.*[ ^I\n]\{-0,})

Explanation:

\<for\> //Match the word "for"

[ ^I\n]\{-0,} //Match any whitespace (space " ", tab "^I", newline "\n") 0 or more times with a non-greedy search (the negative makes it non-greedy)

Why go to all this trouble instead of searching for \<for\>?

Lets say I wanted to find all places where I do a for loop against MAX_INT, I could say:

/\<for\>[ ^I\n]\{-0,}([ ^I\n]\{-0,}.*;[ ^I\n]\{-0,}.*MAX_INT.*;[ ^I\n]\{-0,}.*[ ^I\n]\{-0,})

Please add your own patterns to simplify this, or to match other common code bits. Also, if anyone knows how to match this with :grep, let me know.

Comments

another possibility using \_, which adds newline matching to various patterns:

\<for\>\_s*(\_s*.\{-};\_s*.\{-};\_s.\{-}\_s*)

may or may not satisfy your requirement exaclty, but works for the given examples.

Anonymous , September 6, 2006 15:24

\<for\>\_s*(\(\_s*.*;\)\{2}\_s.*\_s*)

may suffice as well for the first 2 examples.

Anonymous , September 6, 2006 15:32

@@ Line 9: / Line 9: @@
 |rating=0/2
 |text=
-Q: How to do a search that will find both of the following examples?
+'''Q:''' How to do a search that will find both of the following examples?
  for (
+   int i=0;
- int i=0;
+   i&lt;3;
+   i++
- i&lt;3;
- i++
  )
 &amp;
  for ( int i=0; i&lt;3; i++)
 --------------------------------------
-A: Use this pattern
+'''A:''' Use this pattern
+ \&lt;for\&gt;[ ^I\n]\{-0,}([ ^I\n]\{-0,}.*;[ ^I\n]\{-0,}.*;[ ^I\n]\{-0,}.*[ ^I\n]\{-0,})
-\&lt;for\&gt;[ ^I\n]\{-0,}([ ^I\n]\{-0,}.*;[ ^I\n]\{-0,}.*;[ ^I\n]\{-0,}.*[ ^I\n]\{-0,})
 Explanation:
+* <tt>\&lt;for\&gt;</tt> //Match the word "for"
+*<tt>[ ^I\n]\{-0,}</tt> //Match any whitespace (space " ", tab "^I", newline "\n") 0 or more times with a non-greedy search (the negative makes it non-greedy)
-\&lt;for\&gt; //Match the word "for"
-[ ^I\n]\{-0,} //Match any whitespace (space " ", tab "^I", newline "\n") 0 or more times with a non-greedy search (the negative makes it non-greedy)
+Why go to all this trouble instead of searching for <tt>\&lt;for\&gt;</tt>?
-Why go to all this trouble instead of searching for \&lt;for\&gt;?
 Lets say I wanted to find all places where I do a for loop against MAX_INT, I could say:
+ /\&lt;for\&gt;[ ^I\n]\{-0,}([ ^I\n]\{-0,}.*;[ ^I\n]\{-0,}.*MAX_INT.*;[ ^I\n]\{-0,}.*[ ^I\n]\{-0,})
-/\&lt;for\&gt;[ ^I\n]\{-0,}([ ^I\n]\{-0,}.*;[ ^I\n]\{-0,}.*MAX_INT.*;[ ^I\n]\{-0,}.*[ ^I\n]\{-0,})
@@ Line 54: / Line 42: @@
 == Comments ==
 another possibility using \_, which adds newline matching to various patterns:
+ \&lt;for\&gt;\_s*(\_s*.\{-};\_s*.\{-};\_s.\{-}\_s*)
-\&lt;for\&gt;\_s*(\_s*.\{-};\_s*.\{-};\_s.\{-}\_s*)
 may or may not satisfy your requirement exaclty, but works for the given examples.
@@ Line 62: / Line 49: @@
 , September 6, 2006 15:24
 ----
-\&lt;for\&gt;\_s*(\(\_s*.*;\)\{2}\_s.*\_s*)
+ \&lt;for\&gt;\_s*(\(\_s*.*;\)\{2}\_s.*\_s*)
 may suffice as well for the first 2 examples.
@@ Line 72: / Line 59: @@
 [[Category:C]]
 [[Category:C plus plus]]
+[[Category:Searching]]