From: yjc01@doc.ic.ac.uk
To: caml-list@inria.fr
Subject: index of substring
Date: Thu, 27 Jan 2005 00:41:18 +0000 [thread overview]
Message-ID: <1106786478.41f838aecb7dd@www.doc.ic.ac.uk> (raw)
I tried to write a function to return the index of a substring in a string from
an index. So I can use it to extract some comments (text between (* and *) in a
file. But came across some problem when returning the value.
The code I came up with is:
(* Use Unix Module *)
open Unix;;
(* get the file size *)
let fileReader = openfile "student.cd" [O_RDONLY] 0o640;;
let fileSize = (fstat fileReader).st_size;;
print_int fileSize;;
(* create variable to store file *)
let comments = String.make fileSize 'c';;
let read_char () =
read fileReader comments 0 fileSize;;
(* return index of a substring in a string from an index, if substring not
matched retun -1 *)
let index_left fromIndex string findString =
(* Step 1. Find first character *)
let firstIndex = String.index_from string fromIndex (String.get findString 0) in
if (firstIndex >= 0) then
let isMatched = ref true in
for i = 1 to (String.length findString) do
if (String.get string firstIndex) != (String.get findString 0)
then !isMatched = false;
if (!isMatched)
then firstIndex
else -1;
done;;
(* test if index_left works *)
let check index =
index_left index comments "(*"
print_int check 1;;
Or is there an easier way to do this?
Daisy
next reply other threads:[~2005-01-27 0:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-27 0:41 yjc01 [this message]
2005-01-27 4:21 ` [Caml-list] " Matt Gushee
2005-01-27 6:44 ` Radu Grigore
2005-01-27 9:36 ` skaller
2005-01-27 10:20 ` Jean-Christophe Filliatre
2005-01-27 16:55 ` skaller
2005-01-27 17:20 ` Radu Grigore
2005-01-28 8:51 ` Jean-Christophe Filliatre
2005-01-28 13:31 ` skaller
2005-01-27 8:37 ` Oliver Bandel
2005-01-27 9:17 ` Xavier Leroy
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