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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE PatternGuards #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-|
<a name="line-3"></a> This module converts a list of 'Tag' back into a string.
<a name="line-4"></a>-}</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>HTML</span><span class='hs-varop'>.</span><span class='hs-conid'>TagSoup</span><span class='hs-varop'>.</span><span class='hs-conid'>Render</span>
<a name="line-7"></a> <span class='hs-layout'>(</span>
<a name="line-8"></a> <span class='hs-varid'>renderTags</span><span class='hs-layout'>,</span> <span class='hs-varid'>renderTagsOptions</span><span class='hs-layout'>,</span> <span class='hs-varid'>escapeHTML</span><span class='hs-layout'>,</span>
<a name="line-9"></a> <span class='hs-conid'>RenderOptions</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>renderOptions</span>
<a name="line-10"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-11"></a>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IntMap</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>IntMap</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>HTML</span><span class='hs-varop'>.</span><span class='hs-conid'>TagSoup</span><span class='hs-varop'>.</span><span class='hs-conid'>Entity</span>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>HTML</span><span class='hs-varop'>.</span><span class='hs-conid'>TagSoup</span><span class='hs-varop'>.</span><span class='hs-conid'>Type</span>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>StringLike</span>
<a name="line-17"></a>
<a name="line-18"></a>
<a name="line-19"></a><a name="RenderOptions"></a><span class='hs-comment'>-- | These options control how 'renderTags' works.</span>
<a name="line-20"></a><a name="RenderOptions"></a><span class='hs-comment'>--</span>
<a name="line-21"></a><a name="RenderOptions"></a><span class='hs-comment'>-- The strange quirk of only minimizing @\<br\>@ tags is due to Internet Explorer treating</span>
<a name="line-22"></a><a name="RenderOptions"></a><span class='hs-comment'>-- @\<br\>\<\/br\>@ as @\<br\>\<br\>@.</span>
<a name="line-23"></a><a name="RenderOptions"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>RenderOptions</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RenderOptions</span>
<a name="line-24"></a> <span class='hs-layout'>{</span><span class='hs-varid'>optEscape</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>str</span> <span class='hs-comment'>-- ^ Escape a piece of text (default = escape the four characters @&\"\<\>@)</span>
<a name="line-25"></a> <span class='hs-layout'>,</span><span class='hs-varid'>optMinimize</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-comment'>-- ^ Minimise \<b\>\<\/b\> -> \<b/\> (default = minimise only @\<br\>@ tags)</span>
<a name="line-26"></a> <span class='hs-layout'>}</span>
<a name="line-27"></a>
<a name="line-28"></a>
<a name="line-29"></a><a name="escapeHTML"></a><span class='hs-comment'>-- | Replace the four characters @&\"\<\>@ with their HTML entities (the list from 'xmlEntities').</span>
<a name="line-30"></a><span class='hs-definition'>escapeHTML</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>StringLike</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>str</span>
<a name="line-31"></a><span class='hs-definition'>escapeHTML</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromString</span> <span class='hs-varop'>.</span> <span class='hs-varid'>concatMap</span> <span class='hs-varid'>esc1</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toString</span>
<a name="line-32"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>esc</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IntMap</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-str'>"&"</span><span class='hs-varop'>++</span><span class='hs-varid'>a</span><span class='hs-varop'>++</span><span class='hs-str'>";"</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>xmlEntities</span><span class='hs-keyglyph'>]</span>
<a name="line-33"></a> <span class='hs-varid'>esc1</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IntMap</span><span class='hs-varop'>.</span><span class='hs-varid'>findWithDefault</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-varid'>ord</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>esc</span>
<a name="line-34"></a>
<a name="line-35"></a>
<a name="line-36"></a><a name="renderOptions"></a><span class='hs-comment'>-- | The default render options value, described in 'RenderOptions'.</span>
<a name="line-37"></a><span class='hs-definition'>renderOptions</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>StringLike</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>RenderOptions</span> <span class='hs-varid'>str</span>
<a name="line-38"></a><span class='hs-definition'>renderOptions</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RenderOptions</span> <span class='hs-varid'>escapeHTML</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>toString</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-str'>"br"</span><span class='hs-layout'>)</span>
<a name="line-39"></a>
<a name="line-40"></a>
<a name="line-41"></a><a name="renderTags"></a><span class='hs-comment'>-- | Show a list of tags, as they might have been parsed, using the default settings given in</span>
<a name="line-42"></a><span class='hs-comment'>-- 'RenderOptions'.</span>
<a name="line-43"></a><span class='hs-comment'>--</span>
<a name="line-44"></a><span class='hs-comment'>-- > renderTags [TagOpen "hello" [],TagText "my&",TagClose "world"] == "<hello>my&amp;</world>"</span>
<a name="line-45"></a><span class='hs-definition'>renderTags</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>StringLike</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Tag</span> <span class='hs-varid'>str</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>str</span>
<a name="line-46"></a><span class='hs-definition'>renderTags</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>renderTagsOptions</span> <span class='hs-varid'>renderOptions</span>
<a name="line-47"></a>
<a name="line-48"></a>
<a name="line-49"></a><a name="renderTagsOptions"></a><span class='hs-comment'>-- | Show a list of tags using settings supplied by the 'RenderOptions' parameter,</span>
<a name="line-50"></a><span class='hs-comment'>-- eg. to avoid escaping any characters one could do:</span>
<a name="line-51"></a><span class='hs-comment'>--</span>
<a name="line-52"></a><span class='hs-comment'>-- > renderTagsOptions renderOptions{optEscape = id} [TagText "my&"] == "my&"</span>
<a name="line-53"></a><span class='hs-definition'>renderTagsOptions</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>StringLike</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>RenderOptions</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Tag</span> <span class='hs-varid'>str</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>str</span>
<a name="line-54"></a><span class='hs-definition'>renderTagsOptions</span> <span class='hs-varid'>opts</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>strConcat</span> <span class='hs-varop'>.</span> <span class='hs-varid'>tags</span>
<a name="line-55"></a> <span class='hs-keyword'>where</span>
<a name="line-56"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromString</span>
<a name="line-57"></a> <span class='hs-varid'>ss</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-58"></a>
<a name="line-59"></a> <span class='hs-varid'>tags</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagOpen</span> <span class='hs-varid'>name</span> <span class='hs-varid'>atts</span><span class='hs-conop'>:</span><span class='hs-conid'>TagClose</span> <span class='hs-varid'>name2</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-60"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>name</span> <span class='hs-varop'>==</span> <span class='hs-varid'>name2</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>optMinimize</span> <span class='hs-varid'>opts</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>open</span> <span class='hs-varid'>name</span> <span class='hs-varid'>atts</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-str'>" /"</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-varid'>tags</span> <span class='hs-varid'>xs</span>
<a name="line-61"></a> <span class='hs-varid'>tags</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagOpen</span> <span class='hs-varid'>name</span> <span class='hs-varid'>atts</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-chr'>'?'</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>uncons</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>open</span> <span class='hs-varid'>name</span> <span class='hs-varid'>atts</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-str'>" ?"</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-varid'>tags</span> <span class='hs-varid'>xs</span>
<a name="line-62"></a> <span class='hs-varid'>tags</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tag</span> <span class='hs-varid'>x</span> <span class='hs-varop'>++</span> <span class='hs-varid'>tags</span> <span class='hs-varid'>xs</span>
<a name="line-63"></a> <span class='hs-varid'>tags</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-64"></a>
<a name="line-65"></a> <span class='hs-varid'>tag</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagOpen</span> <span class='hs-varid'>name</span> <span class='hs-varid'>atts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>open</span> <span class='hs-varid'>name</span> <span class='hs-varid'>atts</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-str'>""</span><span class='hs-layout'>)</span>
<a name="line-66"></a> <span class='hs-varid'>tag</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagClose</span> <span class='hs-varid'>name</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span> <span class='hs-str'>"</"</span><span class='hs-layout'>,</span> <span class='hs-varid'>name</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span> <span class='hs-str'>">"</span><span class='hs-keyglyph'>]</span>
<a name="line-67"></a> <span class='hs-varid'>tag</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagText</span> <span class='hs-varid'>text</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>txt</span> <span class='hs-varid'>text</span><span class='hs-keyglyph'>]</span>
<a name="line-68"></a> <span class='hs-varid'>tag</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagComment</span> <span class='hs-varid'>text</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ss</span> <span class='hs-str'>"<!--"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>com</span> <span class='hs-varid'>text</span> <span class='hs-varop'>++</span> <span class='hs-varid'>ss</span> <span class='hs-str'>"-->"</span>
<a name="line-69"></a> <span class='hs-varid'>tag</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ss</span> <span class='hs-str'>""</span>
<a name="line-70"></a>
<a name="line-71"></a> <span class='hs-varid'>txt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optEscape</span> <span class='hs-varid'>opts</span>
<a name="line-72"></a> <span class='hs-varid'>open</span> <span class='hs-varid'>name</span> <span class='hs-varid'>atts</span> <span class='hs-varid'>shut</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span> <span class='hs-str'>"<"</span><span class='hs-layout'>,</span><span class='hs-varid'>name</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span> <span class='hs-varid'>concatMap</span> <span class='hs-varid'>att</span> <span class='hs-varid'>atts</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>shut</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span> <span class='hs-str'>">"</span><span class='hs-keyglyph'>]</span>
<a name="line-73"></a> <span class='hs-varid'>att</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>xnull</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>ynull</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span> <span class='hs-str'>" \"\""</span><span class='hs-keyglyph'>]</span>
<a name="line-74"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ynull</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span> <span class='hs-str'>" "</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-75"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>xnull</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span> <span class='hs-str'>" \""</span><span class='hs-layout'>,</span><span class='hs-varid'>txt</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span> <span class='hs-str'>"\""</span><span class='hs-keyglyph'>]</span>
<a name="line-76"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span> <span class='hs-str'>" "</span><span class='hs-layout'>,</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span> <span class='hs-str'>"=\""</span><span class='hs-layout'>,</span><span class='hs-varid'>txt</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span> <span class='hs-str'>"\""</span><span class='hs-keyglyph'>]</span>
<a name="line-77"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>xnull</span><span class='hs-layout'>,</span> <span class='hs-varid'>ynull</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>strNull</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>strNull</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-78"></a>
<a name="line-79"></a> <span class='hs-varid'>com</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-chr'>'-'</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>uncons</span> <span class='hs-varid'>xs</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-chr'>'-'</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>uncons</span> <span class='hs-varid'>xs</span><span class='hs-layout'>,</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-chr'>'>'</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>uncons</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span> <span class='hs-str'>"-- >"</span> <span class='hs-conop'>:</span> <span class='hs-varid'>com</span> <span class='hs-varid'>xs</span>
<a name="line-80"></a> <span class='hs-varid'>com</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>uncons</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>of</span>
<a name="line-81"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-82"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fromChar</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>com</span> <span class='hs-varid'>xs</span>
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