<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ --> <title>Test/HUnit/Terminal.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a><span class='hs-comment'>-- | This module handles the complexities of writing information to the</span> <a name="line-2"></a><span class='hs-comment'>-- terminal, including modifying text in place.</span> <a name="line-3"></a> <a name="line-4"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Test</span><span class='hs-varop'>.</span><span class='hs-conid'>HUnit</span><span class='hs-varop'>.</span><span class='hs-conid'>Terminal</span> <span class='hs-layout'>(</span> <a name="line-5"></a> <span class='hs-varid'>terminalAppearance</span> <a name="line-6"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-7"></a> <a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span><span class='hs-varid'>isPrint</span><span class='hs-layout'>)</span> <a name="line-9"></a> <a name="line-10"></a> <a name="line-11"></a><span class='hs-comment'>-- | Simplifies the input string by interpreting @\\r@ and @\\b@ characters</span> <a name="line-12"></a><span class='hs-comment'>-- specially so that the result string has the same final (or /terminal/,</span> <a name="line-13"></a><span class='hs-comment'>-- pun intended) appearance as would the input string when written to a</span> <a name="line-14"></a><span class='hs-comment'>-- terminal that overwrites character positions following carriage</span> <a name="line-15"></a><span class='hs-comment'>-- returns and backspaces.</span> <a name="line-16"></a> <a name="line-17"></a><a name="terminalAppearance"></a><span class='hs-definition'>terminalAppearance</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <a name="line-18"></a><span class='hs-definition'>terminalAppearance</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ta</span> <span class='hs-varid'>id</span> <span class='hs-str'>""</span> <span class='hs-str'>""</span> <span class='hs-varid'>str</span> <a name="line-19"></a> <a name="line-20"></a><span class='hs-comment'>-- | The helper function @ta@ takes an accumulating @ShowS@-style function</span> <a name="line-21"></a><span class='hs-comment'>-- that holds /committed/ lines of text, a (reversed) list of characters</span> <a name="line-22"></a><span class='hs-comment'>-- on the current line /before/ the cursor, a (normal) list of characters</span> <a name="line-23"></a><span class='hs-comment'>-- on the current line /after/ the cursor, and the remaining input.</span> <a name="line-24"></a> <a name="line-25"></a><a name="ta"></a><span class='hs-definition'>ta</span> <a name="line-26"></a> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ An accumulating @ShowS@-style function</span> <a name="line-27"></a> <span class='hs-comment'>-- that holds /committed/ lines of text</span> <a name="line-28"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ A (reversed) list of characters</span> <a name="line-29"></a> <span class='hs-comment'>-- on the current line /before/ the cursor</span> <a name="line-30"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ A (normal) list of characters</span> <a name="line-31"></a> <span class='hs-comment'>-- on the current line /after/ the cursor</span> <a name="line-32"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ The remaining input</span> <a name="line-33"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <a name="line-34"></a><span class='hs-definition'>ta</span> <span class='hs-varid'>f</span> <span class='hs-varid'>bs</span> <span class='hs-keyword'>as</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\n'</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ta</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>bs</span> <span class='hs-varop'>++</span> <span class='hs-keyword'>as</span> <span class='hs-varop'>++</span> <span class='hs-chr'>'\n'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-str'>""</span> <span class='hs-str'>""</span> <span class='hs-varid'>cs</span> <a name="line-35"></a><span class='hs-definition'>ta</span> <span class='hs-varid'>f</span> <span class='hs-varid'>bs</span> <span class='hs-keyword'>as</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\r'</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ta</span> <span class='hs-varid'>f</span> <span class='hs-str'>""</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>bs</span> <span class='hs-varop'>++</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span> <a name="line-36"></a><span class='hs-definition'>ta</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-conop'>:</span><span class='hs-varid'>bs</span><span class='hs-layout'>)</span> <span class='hs-keyword'>as</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\b'</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ta</span> <span class='hs-varid'>f</span> <span class='hs-varid'>bs</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-conop'>:</span><span class='hs-keyword'>as</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span> <a name="line-37"></a><span class='hs-definition'>ta</span> <span class='hs-keyword'>_</span> <span class='hs-str'>""</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\b'</span><span class='hs-conop'>:</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"'\\b' at beginning of line"</span> <a name="line-38"></a><span class='hs-definition'>ta</span> <span class='hs-varid'>f</span> <span class='hs-varid'>bs</span> <span class='hs-keyword'>as</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <a name="line-39"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>isPrint</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"invalid nonprinting character"</span> <a name="line-40"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-keyword'>as</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ta</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>bs</span><span class='hs-layout'>)</span> <span class='hs-str'>""</span> <span class='hs-varid'>cs</span> <a name="line-41"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ta</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>bs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>tail</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span> <a name="line-42"></a><span class='hs-definition'>ta</span> <span class='hs-varid'>f</span> <span class='hs-varid'>bs</span> <span class='hs-keyword'>as</span> <span class='hs-str'>""</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>bs</span> <span class='hs-varop'>++</span> <span class='hs-keyword'>as</span><span class='hs-layout'>)</span> </pre></body> </html>
