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The uri-common library provides simple and easy-to-use parsing and manipulation procedures for URIs using common schemes.
These "common schemes" all have the following rules:
- An empty path after the hostname is considered to be identical to the root path.
- All components are to be fully URI-decoded (so no percent-encoded characters in it).
- The query argument will be in application/x-www-form-urlencoded form.
- The port is automatically determined if it is omitted and the URI scheme is known.
This library replaces most of the procedures in uri-generic. If you need to work with URIs on the uri-generic level or need to work with both uri-generic and uri-common URI objects, you will have to import and prefix or rename procedures.
Constructors and predicates
These constructors fully decode their arguments, so afterwards it is impossible to distinguish between encoded delimiters and unencoded delimiters. This makes uri-common objects decoding endpoints; no further decoding on the URI level is possible (of course, applications are free to decode further information inside the URI). If for some reason, the original URI is still needed, it can be converted to a uri-generic. However, updating a URI component causes this component's original encoding to be lost, so be careful![procedure] (uri-reference STRING) => URI
A URI reference is either a URI or a relative reference (RFC 3986, Section 4.1). If the given string's prefix does not match the syntax of a scheme followed by a colon separator, then the given string is parsed as a relative reference.[procedure] (uri-reference? URI) => BOOL
Is the given object a URI reference? All objects created by URI-generic constructors are URI references; they are either URIs or relative references. The constructors below are just more strict checking versions of uri-reference. They all create URI references.[procedure] (absolute-uri STRING) => URI
Parses the given string as an absolute URI, in which no fragments are allowed. If no URI scheme is found, or a fragment is detected, this raises an error.
Absolute URIs are defined by RFC 3986 as non-relative URI references without a fragment (RFC 3986, Section 4.2). Absolute URIs can be used as a base URI to resolve a relative-ref against, using uri-relative-to (see below).[procedure] (absolute-uri? URI) => BOOL
Is the given object an absolute URI?[procedure] (uri? URI) => BOOL
Is the given object a URI? URIs are all URI references that include a scheme part. The other type of URI references are relative references.[procedure] (relative-ref? URI) => BOOL
Is the given object a relative reference? Relative references are defined by RFC 3986 as URI references which are not URIs; they contain no URI scheme and can be resolved against an absolute URI to obtain a complete URI using uri-relative-to.
uri-generic and string representation[procedure] (uri->uri-generic uri-common) => uri-generic
[procedure] (uri-generic->uri uri-common) => uri-common
To convert between uri-generic and uri-common objects, use these procedures. As stated above, this will allow you to retrieve the original encoding of the URI components, but once you update a component from the uri-common side, the original encoding is no longer available (the updated value replaces the original value).[procedure] (uri->string uri-common userinfo) => string
Reconstructs the given URI into a string; uses a supplied function LAMBDA USERNAME PASSWORD -> STRING to map the userinfo part of the URI.
- <procedure>(uri-scheme uri-common) => symbol</procedure>
- <procedure>(uri-path uri-common) => list</procedure>
- <procedure>(uri-query uri-common) => alist</procedure>
- <procedure>(uri-fragment uri-common) => string</procedure>
- <procedure>(uri-host uri-common) => string</procedure>
- <procedure>(uri-port uri-common) => integer</procedure>
- <procedure>(uri-username uri-common) => string</procedure>
- <procedure>(uri-password uri-common) => string</procedure>
If a component is not defined in the given URI-common, then the corresponding accessor returns #f.
- <procedure>(update-uri URI-common #!key scheme path query fragment host port username password) => URI-common</procedure>
Update the specified keys in the URI-common object in a functional way (ie, it creates a new copy with the modifications).
Reference Resolution[procedure] (uri-relative-to URI URI) => URI
Resolve the first URI as a reference relative to the second URI, returning a new URI (RFC 3986, Section 5.2.2).[procedure] (uri-relative-from URI URI) => URI
Constructs a new, possibly relative, URI which represents the location of the first URI with respect to the second URI.
(uri->string (uri-relative-to (uri-reference "../qux") (uri-reference "http://example.com/foo/bar/")))
(uri->string (uri-relative-from (uri-reference "http://example.com/foo/qux") (uri-reference "http://example.com/foo/bar/")))
Query encoding and decoding
- <parameter>(form-urlencoded-separator [char-set/char/string])</parameter>
- <procedure>(form-urlencode alist #!key (separator (form-urlencoded-separator))) => string</procedure>
- <procedure>(form-urldecode string #!key (separator (form-urlencoded-separator))) => alist</procedure>
Encode or decode an alist using the encoding corresponding to the form-urlencoded media type, using the given separator character(s).
When encoding, if separator is a string, the first character will be used as the separator in the resulting querystring. If it is a char-set, it will be converted to a string and its first character will be taken. In either case, all of these characters are encoded if they occur inside the key/value pairs.
When decoding, any character in the set (or string) will be seen as a separator.
The separator defaults to the string ";&". This means that either semicolons or ampersands are allowed as separators when decoding an URI string, but semicolons are used when generating strings.
If you would like to use a different separator, you should parameterize all calls to procedures that return an uri-common object.
Normalization[procedure] (uri-normalize-case URI) => URI
URI case normalization (RFC 3986 section 22.214.171.124)[procedure] (uri-normalize-path-segments URI) => URI
URI path segment normalization (RFC 3986 section 126.96.36.199)
- trunk Add predicates for URIs, absolute URIs and relative references, matching the ones in uri-generic.
- 0.1 Initial Release
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