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authorPéter Dimitrov <[email protected]>2017-11-07 16:23:09 +0100
committerPéter Dimitrov <[email protected]>2017-11-09 17:44:02 +0100
commit1bb2c76c09510bf761c4a6908ae78d1e2a87d574 (patch)
tree95632b54ac778233b4cc28ccb37110ef97c7882a /lib/stdlib/doc/src
parent6db8210068a55696cd5e444d40d3676737113d03 (diff)
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stdlib: Implement compose and dissect query (HTML5)
Implement functions for handling form-urlencoded query strings based on the HTML5 specification.
Diffstat (limited to 'lib/stdlib/doc/src')
-rw-r--r--lib/stdlib/doc/src/uri_string.xml98
1 files changed, 97 insertions, 1 deletions
diff --git a/lib/stdlib/doc/src/uri_string.xml b/lib/stdlib/doc/src/uri_string.xml
index 9ace2b0a05..21f470e763 100644
--- a/lib/stdlib/doc/src/uri_string.xml
+++ b/lib/stdlib/doc/src/uri_string.xml
@@ -31,7 +31,8 @@
<modulesummary>URI processing functions.</modulesummary>
<description>
<p>This module contains functions for parsing and handling URIs
- (<url href="https://www.ietf.org/rfc/rfc3986.txt">RFC 3986</url>).
+ (<url href="https://www.ietf.org/rfc/rfc3986.txt">RFC 3986</url>) and
+ form-urlencoded query strings (<url href="https://www.w3.org/TR/html5/forms.html">HTML5</url>).
</p>
<p>A URI is an identifier consisting of a sequence of characters matching the syntax
rule named <em>URI</em> in <url href="https://www.ietf.org/rfc/rfc3986.txt">RFC 3986</url>.
@@ -71,6 +72,13 @@
<item>Transforming URIs into a normalized form<br></br>
<seealso marker="#normalize/1"><c>normalize/1</c></seealso>
</item>
+ <item>Composing form-urlencoded query strings from a list of key-value pairs<br></br>
+ <seealso marker="#compose_query/1"><c>compose_query/1</c></seealso><br></br>
+ <seealso marker="#compose_query/2"><c>compose_query/2</c></seealso>
+ </item>
+ <item>Dissecting form-urlencoded query strings into a list of key-value pairs<br></br>
+ <seealso marker="#dissect_query/1"><c>dissect_query/1</c></seealso>
+ </item>
</list>
<p>There are four different encodings present during the handling of URIs:</p>
<list type="bulleted">
@@ -102,12 +110,15 @@
<desc>
<p>Error tuple indicating the type of error. Possible values of the second component:</p>
<list type="bulleted">
+ <item><c>invalid_character</c></item>
+ <item><c>invalid_encoding</c></item>
<item><c>invalid_input</c></item>
<item><c>invalid_map</c></item>
<item><c>invalid_percent_encoding</c></item>
<item><c>invalid_scheme</c></item>
<item><c>invalid_uri</c></item>
<item><c>invalid_utf8</c></item>
+ <item><c>missing_value</c></item>
</list>
<p>The third component is a term providing additional information about the
cause of the error.</p>
@@ -134,6 +145,91 @@
<funcs>
<func>
+ <name name="compose_query" arity="1"/>
+ <fsummary>Compose urlencoded query string.</fsummary>
+ <desc>
+ <p>Composes a form-urlencoded <c><anno>QueryString</anno></c> based on a
+ <c><anno>QueryList</anno></c>, a list of non-percent-encoded key-value pairs.
+ Form-urlencoding is defined in section
+ 4.10.22.6 of the <url href="https://www.w3.org/TR/html5/forms.html">HTML5</url>
+ specification.
+ </p>
+ <p>See also the opposite operation <seealso marker="#dissect_query/1">
+ <c>dissect_query/1</c></seealso>.
+ </p>
+ <p><em>Example:</em></p>
+ <pre>
+1> <input>uri_string:compose_query([{"foo bar","1"},{"city","örebro"}]).</input>
+<![CDATA["foo+bar=1&city=%C3%B6rebro"]]>
+2> <![CDATA[uri_string:compose_query([{<<"foo bar">>,<<"1">>},
+2> {<<"city">>,<<"örebro"/utf8>>}]).]]>
+<![CDATA[<<"foo+bar=1&city=%C3%B6rebro">>]]>
+ </pre>
+ </desc>
+ </func>
+
+ <func>
+ <name name="compose_query" arity="2"/>
+ <fsummary>Compose urlencoded query string.</fsummary>
+ <desc>
+ <p>Same as <c>compose_query/1</c> but with an additional
+ <c><anno>Options</anno></c> parameter, that controls the encoding ("charset")
+ used by the encoding algorithm. There are two supported encodings: <c>utf8</c>
+ (or <c>unicode</c>) and <c>latin1</c>.
+ </p>
+ <p>Each character in the entry's name and value that cannot be expressed using
+ the selected character encoding, is replaced by a string consisting of a U+0026
+ AMPERSAND character (<![CDATA[&]]>), a "#" (U+0023) character, one or more ASCII
+ digits representing the Unicode code point of the character in base ten, and
+ finally a ";" (U+003B) character.
+ </p>
+ <p>Bytes that are out of the range 0x2A, 0x2D, 0x2E, 0x30 to 0x39, 0x41 to 0x5A, 0x5F,
+ 0x61 to 0x7A, are percent-encoded (U+0025 PERCENT SIGN character (%) followed by
+ uppercase ASCII hex digits representing the hexadecimal value of the byte).
+ </p>
+ <p>See also the opposite operation <seealso marker="#dissect_query/1">
+ <c>dissect_query/1</c></seealso>.
+ </p>
+ <p><em>Example:</em></p>
+ <pre>
+1> <input>uri_string:compose_query([{"foo bar","1"},{"city","örebro"}],</input>
+1> [{encoding, latin1}]).
+<![CDATA["foo+bar=1&city=%F6rebro"
+2> uri_string:compose_query([{<<"foo bar">>,<<"1">>},
+2> {<<"city">>,<<"東京"/utf8>>}], [{encoding, latin1}]).]]>
+<![CDATA[<<"foo+bar=1&city=%26%2326481%3B%26%2320140%3B">>]]>
+ </pre>
+ </desc>
+ </func>
+
+ <func>
+ <name name="dissect_query" arity="1"/>
+ <fsummary>Dissect query string.</fsummary>
+ <desc>
+ <p>Dissects an urlencoded <c><anno>QueryString</anno></c> and returns a
+ <c><anno>QueryList</anno></c>, a list of non-percent-encoded key-value pairs.
+ Form-urlencoding is defined in section
+ 4.10.22.6 of the <url href="https://www.w3.org/TR/html5/forms.html">HTML5</url>
+ specification.
+ </p>
+ <p>It is not as strict for its input as the decoding algorithm defined by
+ <url href="https://www.w3.org/TR/html5/forms.html">HTML5</url>
+ and accepts all unicode characters.</p>
+ <p>See also the opposite operation <seealso marker="#compose_query/1">
+ <c>compose_query/1</c></seealso>.
+ </p>
+ <p><em>Example:</em></p>
+ <pre>
+1> <input><![CDATA[uri_string:dissect_query("foo+bar=1&city=%C3%B6rebro").]]></input>
+[{"foo bar","1"},{"city","örebro"}]
+2> <![CDATA[uri_string:dissect_query(<<"foo+bar=1&city=%26%2326481%3B%26%2320140%3B">>).]]>
+<![CDATA[[{<<"foo bar">>,<<"1">>},
+ {<<"city">>,<<230,157,177,228,186,172>>}] ]]>
+ </pre>
+ </desc>
+ </func>
+
+ <func>
<name name="normalize" arity="1"/>
<fsummary>Syntax-based normalization.</fsummary>
<desc>