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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- | The central type in TagSoup</span>
<a name="line-3"></a>
<a name="line-4"></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'>Type</span><span class='hs-layout'>(</span>
<a name="line-5"></a> <span class='hs-comment'>-- * Data structures and parsing</span>
<a name="line-6"></a> <span class='hs-conid'>StringLike</span><span class='hs-layout'>,</span> <span class='hs-conid'>Tag</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Attribute</span><span class='hs-layout'>,</span> <span class='hs-conid'>Row</span><span class='hs-layout'>,</span> <span class='hs-conid'>Column</span><span class='hs-layout'>,</span>
<a name="line-7"></a>
<a name="line-8"></a> <span class='hs-comment'>-- * Position manipulation</span>
<a name="line-9"></a> <span class='hs-conid'>Position</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'>tagPosition</span><span class='hs-layout'>,</span> <span class='hs-varid'>nullPosition</span><span class='hs-layout'>,</span> <span class='hs-varid'>positionChar</span><span class='hs-layout'>,</span> <span class='hs-varid'>positionString</span><span class='hs-layout'>,</span>
<a name="line-10"></a>
<a name="line-11"></a> <span class='hs-comment'>-- * Tag identification</span>
<a name="line-12"></a> <span class='hs-varid'>isTagOpen</span><span class='hs-layout'>,</span> <span class='hs-varid'>isTagClose</span><span class='hs-layout'>,</span> <span class='hs-varid'>isTagText</span><span class='hs-layout'>,</span> <span class='hs-varid'>isTagWarning</span><span class='hs-layout'>,</span> <span class='hs-varid'>isTagPosition</span><span class='hs-layout'>,</span>
<a name="line-13"></a> <span class='hs-varid'>isTagOpenName</span><span class='hs-layout'>,</span> <span class='hs-varid'>isTagCloseName</span><span class='hs-layout'>,</span>
<a name="line-14"></a>
<a name="line-15"></a> <span class='hs-comment'>-- * Extraction</span>
<a name="line-16"></a> <span class='hs-varid'>fromTagText</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromAttrib</span><span class='hs-layout'>,</span>
<a name="line-17"></a> <span class='hs-varid'>maybeTagText</span><span class='hs-layout'>,</span> <span class='hs-varid'>maybeTagWarning</span><span class='hs-layout'>,</span>
<a name="line-18"></a> <span class='hs-varid'>innerText</span><span class='hs-layout'>,</span>
<a name="line-19"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-20"></a>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span>
<a name="line-24"></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-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-layout'>(</span><span class='hs-conid'>Data</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-26"></a>
<a name="line-27"></a><a name="Attribute"></a><span class='hs-comment'>-- | An HTML attribute @id=\"name\"@ generates @(\"id\",\"name\")@</span>
<a name="line-28"></a><a name="Attribute"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Attribute</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>str</span><span class='hs-layout'>,</span><span class='hs-varid'>str</span><span class='hs-layout'>)</span>
<a name="line-29"></a>
<a name="line-30"></a><a name="Row"></a><span class='hs-comment'>-- | The row/line of a position, starting at 1</span>
<a name="line-31"></a><a name="Row"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Row</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="Column"></a><span class='hs-comment'>-- | The column of a position, starting at 1</span>
<a name="line-34"></a><a name="Column"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Column</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-35"></a>
<a name="line-36"></a>
<a name="line-37"></a><a name="Position"></a><span class='hs-comment'>--- All positions are stored as a row and a column, with (1,1) being the</span>
<a name="line-38"></a><a name="Position"></a><span class='hs-comment'>--- top-left position</span>
<a name="line-39"></a><a name="Position"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Position</span> <span class='hs-varop'>!</span><span class='hs-conid'>Row</span> <span class='hs-varop'>!</span><span class='hs-conid'>Column</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span><span class='hs-conid'>Ord</span><span class='hs-layout'>)</span>
<a name="line-40"></a>
<a name="line-41"></a><a name="nullPosition"></a><span class='hs-definition'>nullPosition</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Position</span>
<a name="line-42"></a><span class='hs-definition'>nullPosition</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Position</span> <span class='hs-num'>1</span> <span class='hs-num'>1</span>
<a name="line-43"></a>
<a name="line-44"></a><a name="positionString"></a><span class='hs-definition'>positionString</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span>
<a name="line-45"></a><span class='hs-definition'>positionString</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldl'</span> <span class='hs-varid'>positionChar</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="positionChar"></a><span class='hs-definition'>positionChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span>
<a name="line-48"></a><span class='hs-definition'>positionChar</span> <span class='hs-layout'>(</span><span class='hs-conid'>Position</span> <span class='hs-varid'>r</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-49"></a> <span class='hs-chr'>'\n'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span>
<a name="line-50"></a> <span class='hs-chr'>'\t'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varop'>+</span> <span class='hs-num'>8</span> <span class='hs-comment'>-</span> <span class='hs-varid'>mod</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-num'>8</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-52"></a>
<a name="line-53"></a><a name="tagPosition"></a><span class='hs-definition'>tagPosition</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Tag</span> <span class='hs-varid'>str</span>
<a name="line-54"></a><span class='hs-definition'>tagPosition</span> <span class='hs-layout'>(</span><span class='hs-conid'>Position</span> <span class='hs-varid'>r</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TagPosition</span> <span class='hs-varid'>r</span> <span class='hs-varid'>c</span>
<a name="line-55"></a>
<a name="line-56"></a>
<a name="line-57"></a><a name="Tag"></a><span class='hs-comment'>-- | A single HTML element. A whole document is represented by a list of @Tag@.</span>
<a name="line-58"></a><a name="Tag"></a><span class='hs-comment'>-- There is no requirement for 'TagOpen' and 'TagClose' to match.</span>
<a name="line-59"></a><a name="Tag"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Tag</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span>
<a name="line-60"></a> <span class='hs-conid'>TagOpen</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Attribute</span> <span class='hs-varid'>str</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ An open tag with 'Attribute's in their original order</span>
<a name="line-61"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TagClose</span> <span class='hs-varid'>str</span> <span class='hs-comment'>-- ^ A closing tag</span>
<a name="line-62"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TagText</span> <span class='hs-varid'>str</span> <span class='hs-comment'>-- ^ A text node, guaranteed not to be the empty string</span>
<a name="line-63"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TagComment</span> <span class='hs-varid'>str</span> <span class='hs-comment'>-- ^ A comment</span>
<a name="line-64"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TagWarning</span> <span class='hs-varid'>str</span> <span class='hs-comment'>-- ^ Meta: A syntax error in the input file</span>
<a name="line-65"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TagPosition</span> <span class='hs-varop'>!</span><span class='hs-conid'>Row</span> <span class='hs-varop'>!</span><span class='hs-conid'>Column</span> <span class='hs-comment'>-- ^ Meta: The position of a parsed element</span>
<a name="line-66"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>,</span> <span class='hs-conid'>Data</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-67"></a>
<a name="line-68"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-conid'>Tag</span> <span class='hs-keyword'>where</span>
<a name="line-69"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagOpen</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TagOpen</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>b</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'>y</span><span class='hs-keyglyph'>]</span>
<a name="line-70"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagClose</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TagClose</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-71"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagText</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TagText</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-72"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagComment</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TagComment</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagWarning</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TagWarning</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-74"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagPosition</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TagPosition</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-75"></a>
<a name="line-76"></a>
<a name="line-77"></a><a name="isTagOpen"></a><span class='hs-comment'>-- | Test if a 'Tag' is a 'TagOpen'</span>
<a name="line-78"></a><span class='hs-definition'>isTagOpen</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-conid'>Bool</span>
<a name="line-79"></a><span class='hs-definition'>isTagOpen</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagOpen</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span><span class='hs-layout'>;</span> <span class='hs-varid'>isTagOpen</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-80"></a>
<a name="line-81"></a><a name="isTagClose"></a><span class='hs-comment'>-- | Test if a 'Tag' is a 'TagClose'</span>
<a name="line-82"></a><span class='hs-definition'>isTagClose</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-conid'>Bool</span>
<a name="line-83"></a><span class='hs-definition'>isTagClose</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagClose</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span><span class='hs-layout'>;</span> <span class='hs-varid'>isTagClose</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-84"></a>
<a name="line-85"></a><a name="isTagText"></a><span class='hs-comment'>-- | Test if a 'Tag' is a 'TagText'</span>
<a name="line-86"></a><span class='hs-definition'>isTagText</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-conid'>Bool</span>
<a name="line-87"></a><span class='hs-definition'>isTagText</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagText</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span><span class='hs-layout'>;</span> <span class='hs-varid'>isTagText</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-88"></a>
<a name="line-89"></a><a name="maybeTagText"></a><span class='hs-comment'>-- | Extract the string from within 'TagText', otherwise 'Nothing'</span>
<a name="line-90"></a><span class='hs-definition'>maybeTagText</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-conid'>Maybe</span> <span class='hs-varid'>str</span>
<a name="line-91"></a><span class='hs-definition'>maybeTagText</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagText</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span>
<a name="line-92"></a><span class='hs-definition'>maybeTagText</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-93"></a>
<a name="line-94"></a><a name="fromTagText"></a><span class='hs-comment'>-- | Extract the string from within 'TagText', crashes if not a 'TagText'</span>
<a name="line-95"></a><span class='hs-definition'>fromTagText</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>str</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-varid'>str</span>
<a name="line-96"></a><span class='hs-definition'>fromTagText</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagText</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-97"></a><span class='hs-definition'>fromTagText</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"("</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>x</span> <span class='hs-varop'>++</span> <span class='hs-str'>") is not a TagText"</span>
<a name="line-98"></a>
<a name="line-99"></a><a name="innerText"></a><span class='hs-comment'>-- | Extract all text content from tags (similar to Verbatim found in HaXml)</span>
<a name="line-100"></a><span class='hs-definition'>innerText</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-101"></a><span class='hs-definition'>innerText</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>strConcat</span> <span class='hs-varop'>.</span> <span class='hs-varid'>mapMaybe</span> <span class='hs-varid'>maybeTagText</span>
<a name="line-102"></a>
<a name="line-103"></a><a name="isTagWarning"></a><span class='hs-comment'>-- | Test if a 'Tag' is a 'TagWarning'</span>
<a name="line-104"></a><span class='hs-definition'>isTagWarning</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-conid'>Bool</span>
<a name="line-105"></a><span class='hs-definition'>isTagWarning</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagWarning</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span><span class='hs-layout'>;</span> <span class='hs-varid'>isTagWarning</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-106"></a>
<a name="line-107"></a><a name="maybeTagWarning"></a><span class='hs-comment'>-- | Extract the string from within 'TagWarning', otherwise 'Nothing'</span>
<a name="line-108"></a><span class='hs-definition'>maybeTagWarning</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-conid'>Maybe</span> <span class='hs-varid'>str</span>
<a name="line-109"></a><span class='hs-definition'>maybeTagWarning</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagWarning</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span>
<a name="line-110"></a><span class='hs-definition'>maybeTagWarning</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-111"></a>
<a name="line-112"></a><a name="isTagPosition"></a><span class='hs-comment'>-- | Test if a 'Tag' is a 'TagPosition'</span>
<a name="line-113"></a><span class='hs-definition'>isTagPosition</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-conid'>Bool</span>
<a name="line-114"></a><span class='hs-definition'>isTagPosition</span> <span class='hs-conid'>TagPosition</span><span class='hs-layout'>{</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span><span class='hs-layout'>;</span> <span class='hs-varid'>isTagPosition</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-115"></a>
<a name="line-116"></a><a name="fromAttrib"></a><span class='hs-comment'>-- | Extract an attribute, crashes if not a 'TagOpen'.</span>
<a name="line-117"></a><span class='hs-comment'>-- Returns @\"\"@ if no attribute present.</span>
<a name="line-118"></a><span class='hs-definition'>fromAttrib</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span> <span class='hs-varid'>str</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>str</span><span class='hs-layout'>,</span> <span class='hs-conid'>StringLike</span> <span class='hs-varid'>str</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>str</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-varid'>str</span>
<a name="line-119"></a><span class='hs-definition'>fromAttrib</span> <span class='hs-varid'>att</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagOpen</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>atts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-varid'>empty</span> <span class='hs-varop'>$</span> <span class='hs-varid'>lookup</span> <span class='hs-varid'>att</span> <span class='hs-varid'>atts</span>
<a name="line-120"></a><span class='hs-definition'>fromAttrib</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-layout'>(</span><span class='hs-str'>"("</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>x</span> <span class='hs-varop'>++</span> <span class='hs-str'>") is not a TagOpen"</span><span class='hs-layout'>)</span>
<a name="line-121"></a>
<a name="line-122"></a>
<a name="line-123"></a><a name="isTagOpenName"></a><span class='hs-comment'>-- | Returns True if the 'Tag' is 'TagOpen' and matches the given name</span>
<a name="line-124"></a><span class='hs-definition'>isTagOpenName</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</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-conid'>Tag</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-125"></a><span class='hs-definition'>isTagOpenName</span> <span class='hs-varid'>name</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagOpen</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-varid'>name</span>
<a name="line-126"></a><span class='hs-definition'>isTagOpenName</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-127"></a>
<a name="line-128"></a><a name="isTagCloseName"></a><span class='hs-comment'>-- | Returns True if the 'Tag' is 'TagClose' and matches the given name</span>
<a name="line-129"></a><span class='hs-definition'>isTagCloseName</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</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-conid'>Tag</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-130"></a><span class='hs-definition'>isTagCloseName</span> <span class='hs-varid'>name</span> <span class='hs-layout'>(</span><span class='hs-conid'>TagClose</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-varid'>name</span>
<a name="line-131"></a><span class='hs-definition'>isTagCloseName</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
</pre></body>
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