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PARSE_URL

PARSE_URL

The PARSE_URL function breaks a URL string into substrings that correspond to the URL_* properties of IDLnet* objects.

Note: This is not an object method and does not set any object properties.

Note: If a port number is not found in the URL string parameter, the default port value is 80.

PARSE_URL is a pure string-processing routine. Validation of the values is left to the user. The returned value is a structure created by applying the following rules to the input URL string:

URL Index

URL
Section

Example

Rule

0

Scheme

“http”, “https”, or “ftp”

From beginning of URL string up to (but not including) “://”

1

Username

anonymous

If ‘@’ is present before the first single ‘/’, everything from “://” to either ‘:’ or ‘@’ if ‘:’ is not present

2

Password

make-something-up

If both ‘@’ and ‘:’ are present before the first single ‘/’, everything from ‘:’ to ‘@’

3

Host

somehost.com

Everything from “://” or ‘@’ to ‘:’ or first single ‘/’

4

Port

80

If ‘:’ follows the host name, everything between ‘:’ and the first single ‘/’

5

Path

directory/subdirectory/index.html

Everything between the first single ‘/’ and ‘?’ or end of string

6

Query

parm1=value1&parm2=value2

Everything from ‘?’ to the end of the string

URL string components are illustrated in the following example:

http://uname:passwd@somehost.com:80/path/page.pl?p1=v1&p2=v2
0 |  | 1 | | 2  | |     3    ||4|     5      | |    6    |

This routine is written in the IDL language. Its source code can be found in the file parse_url.pro in the lib subdirectory of the IDL distribution.

Examples


The following example strips a known URL to its component strings.

; Start with a hypothetical URL string 
urlString = 'http://someserver.com/path/to/firstfile.dat'
PRINT, 'Original URL string = '+urlString
; Split the URL into its component substrings
urlComponents = PARSE_URL(urlString)
; Populate an IDLnetURL object with the URL information
urlObj =OBJ_NEW('IDLnetURL')
urlObj->SetProperty, URL_SCHEME = urlComponents.scheme, $
   URL_HOST = urlComponents.host, $
   URL_PATH = urlComponents.path
; Get the object's URL property values, and print them
urlObj->GetProperty, URL_SCHEME = urlScheme
urlObj->GetProperty, URL_HOST = urlHost
urlObj->GetProperty, URL_PATH = urlPath
PRINT, 'URL scheme = '+urlScheme
PRINT, 'URL host = '+ urlHost
PRINT, 'URL path = '+urlPath

Syntax


Result = PARSE_URL(URL)

Return Value


PARSE_URL returns an anonymous structure containing the disassembled segments of the URL. The fields in the structure are:

SCHEME
USERNAME 
PASSWORD 
HOST
PORT 
PATH 
QUERY

All fields contain string values.

To see the structure tag names, enter the following code in the IDL command line:

help, Result, /struct

Arguments


URL

A URL in string form.

Keywords


None.

Version History


6.4

Introduced

See Also


IDLnetURL



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