Mailing List Archive: Speed and Memory Management in REBOL

[REBOL] Speed and Memory Management in REBOL

From: princepawn::lycos::com at: 5-Sep-2000 12:52



I was glancing at one of the most popular scripts at the REBOL archive and developed 
some questions:

1- Is it possible to incrementally write to a file in REBOL?
2- Is it possible to append to a file in REBOL

3- This script seems in-efficient and memory wasteful: it reads and entire file into 
a temporary array and then converts the array. In Perl, I could do each conversion as 
I read in each line and write each line out after each conversion.

REBOL [
    Title:   "Comma-Seperated-Values to REBOL converter"
    Date:    16-Jun-1999
    Author:  "Bohdan Lechnowsky"
    Email:   [bo--rebol--com]
    File:    %convert-csv.r
    Purpose: {
        Convert CSV files to REBOL blocks
    }
    Category: [file util db text 2]
]

csv: read/lines to-file ask "Filename to convert from CSV: "

block: make block! 100

headings: parse/all first csv ","

foreach line next csv [append block parse/all line ","]

save to-file ask "Filename to save to: " head insert/only block headings