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<title>src/Darcs/Patch/RegChars.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- Copyright (C) 2003 David Roundy</span>
<a name="line-2"></a><span class='hs-comment'>--</span>
<a name="line-3"></a><span class='hs-comment'>-- This program is free software; you can redistribute it and/or modify</span>
<a name="line-4"></a><span class='hs-comment'>-- it under the terms of the GNU General Public License as published by</span>
<a name="line-5"></a><span class='hs-comment'>-- the Free Software Foundation; either version 2, or (at your option)</span>
<a name="line-6"></a><span class='hs-comment'>-- any later version.</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- This program is distributed in the hope that it will be useful,</span>
<a name="line-9"></a><span class='hs-comment'>-- but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="line-10"></a><span class='hs-comment'>-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="line-11"></a><span class='hs-comment'>-- GNU General Public License for more details.</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- You should have received a copy of the GNU General Public License</span>
<a name="line-14"></a><span class='hs-comment'>-- along with this program; see the file COPYING. If not, write to</span>
<a name="line-15"></a><span class='hs-comment'>-- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,</span>
<a name="line-16"></a><span class='hs-comment'>-- Boston, MA 02110-1301, USA.</span>
<a name="line-17"></a>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Darcs</span><span class='hs-varop'>.</span><span class='hs-conid'>Patch</span><span class='hs-varop'>.</span><span class='hs-conid'>RegChars</span> <span class='hs-layout'>(</span> <span class='hs-varid'>regChars</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></a><a name="&&&"></a><span class='hs-layout'>(</span><span class='hs-varop'>&&&</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-keyglyph'>-></span> <span class='hs-conid'>Bool</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-keyglyph'>-></span> <span class='hs-conid'>Bool</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-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-layout'>(</span><span class='hs-varop'>&&&</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varid'>c</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span>
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<a name="line-25"></a><a name="|||"></a><span class='hs-layout'>(</span><span class='hs-varop'>|||</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-keyglyph'>-></span> <span class='hs-conid'>Bool</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-keyglyph'>-></span> <span class='hs-conid'>Bool</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-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-layout'>(</span><span class='hs-varop'>|||</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varid'>c</span> <span class='hs-varop'>||</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span>
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<a name="line-28"></a><span class='hs-comment'>{-# INLINE regChars #-}</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='hs-comment'>-- | 'regChars' returns a filter function that tells if a char is a member</span>
<a name="line-31"></a><span class='hs-comment'>-- of the regChar expression or not. The regChar expression is basically a</span>
<a name="line-32"></a><span class='hs-comment'>-- set of chars, but it can contain ranges with use of the '-' (dash), and</span>
<a name="line-33"></a><span class='hs-comment'>-- it can also be specified as a complement set by prefixing with '^'</span>
<a name="line-34"></a><span class='hs-comment'>-- (caret). The dash and caret, as well as the backslash, can all be</span>
<a name="line-35"></a><span class='hs-comment'>-- escaped with a backslash to suppress their special meaning.</span>
<a name="line-36"></a><span class='hs-comment'>-- </span>
<a name="line-37"></a><span class='hs-comment'>-- NOTE: The '.' (dot) is allowed to be escaped. It has no special meaning</span>
<a name="line-38"></a><span class='hs-comment'>-- if it is not escaped, but the default 'filename_toks' in</span>
<a name="line-39"></a><span class='hs-comment'>-- Darcs.Commands.Replace uses an escaped dot (WHY?).</span>
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<a name="line-41"></a><a name="regChars"></a><span class='hs-definition'>regChars</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-42"></a><span class='hs-definition'>regChars</span> <span class='hs-layout'>(</span><span class='hs-chr'>'^'</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'>not</span> <span class='hs-varop'>.</span> <span class='hs-varid'>normalRegChars</span> <span class='hs-layout'>(</span><span class='hs-varid'>unescapeChars</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-43"></a><span class='hs-definition'>regChars</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'^'</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'>normalRegChars</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unescapeChars</span> <span class='hs-varop'>$</span> <span class='hs-chr'>'^'</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span>
<a name="line-44"></a><span class='hs-definition'>regChars</span> <span class='hs-varid'>cs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>normalRegChars</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unescapeChars</span> <span class='hs-varid'>cs</span>
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<a name="line-46"></a><span class='hs-comment'>{-# INLINE unescapeChars #-}</span>
<a name="line-47"></a>
<a name="line-48"></a><span class='hs-comment'>-- | 'unescapeChars' unescapes whitespace, which is escaped in the replace</span>
<a name="line-49"></a><span class='hs-comment'>-- patch file format. It will also unescape escaped carets, which is useful</span>
<a name="line-50"></a><span class='hs-comment'>-- for escaping a leading caret that should not invert the regChars. All</span>
<a name="line-51"></a><span class='hs-comment'>-- other escapes are left for the unescaping in 'normalRegChars'.</span>
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<a name="line-53"></a><a name="unescapeChars"></a><span class='hs-definition'>unescapeChars</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-54"></a><span class='hs-definition'>unescapeChars</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</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-chr'>'\n'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>unescapeChars</span> <span class='hs-varid'>cs</span>
<a name="line-55"></a><span class='hs-definition'>unescapeChars</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'t'</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-chr'>'\t'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>unescapeChars</span> <span class='hs-varid'>cs</span>
<a name="line-56"></a><span class='hs-definition'>unescapeChars</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'^'</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-chr'>'^'</span> <span class='hs-conop'>:</span> <span class='hs-varid'>unescapeChars</span> <span class='hs-varid'>cs</span>
<a name="line-57"></a><span class='hs-definition'>unescapeChars</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> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span> <span class='hs-conop'>:</span> <span class='hs-varid'>unescapeChars</span> <span class='hs-varid'>cs</span>
<a name="line-58"></a><span class='hs-definition'>unescapeChars</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
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<a name="line-60"></a><span class='hs-comment'>{-# INLINE normalRegChars #-}</span>
<a name="line-61"></a>
<a name="line-62"></a><span class='hs-comment'>-- | 'normalRegChars' assembles the filter function. It handles special</span>
<a name="line-63"></a><span class='hs-comment'>-- chars, and also unescaping of escaped special chars. If a non-special</span>
<a name="line-64"></a><span class='hs-comment'>-- char is still escaped by now we get a failure.</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="normalRegChars"></a><span class='hs-definition'>normalRegChars</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-67"></a><span class='hs-definition'>normalRegChars</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'.'</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-layout'>(</span><span class='hs-varop'>==</span><span class='hs-chr'>'.'</span><span class='hs-layout'>)</span> <span class='hs-varop'>|||</span> <span class='hs-varid'>normalRegChars</span> <span class='hs-varid'>cs</span>
<a name="line-68"></a><span class='hs-definition'>normalRegChars</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'-'</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-layout'>(</span><span class='hs-varop'>==</span><span class='hs-chr'>'-'</span><span class='hs-layout'>)</span> <span class='hs-varop'>|||</span> <span class='hs-varid'>normalRegChars</span> <span class='hs-varid'>cs</span>
<a name="line-69"></a><span class='hs-definition'>normalRegChars</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'\\'</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-layout'>(</span><span class='hs-varop'>==</span><span class='hs-chr'>'\\'</span><span class='hs-layout'>)</span> <span class='hs-varop'>|||</span> <span class='hs-varid'>normalRegChars</span> <span class='hs-varid'>cs</span>
<a name="line-70"></a><span class='hs-definition'>normalRegChars</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-varid'>c</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-varop'>$</span> <span class='hs-str'>"'\\"</span><span class='hs-varop'>++</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span><span class='hs-varop'>++</span><span class='hs-str'>"' not supported."</span>
<a name="line-71"></a><span class='hs-definition'>normalRegChars</span> <span class='hs-layout'>(</span><span class='hs-varid'>c1</span><span class='hs-conop'>:</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-varid'>c2</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-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>>=</span> <span class='hs-varid'>c1</span><span class='hs-layout'>)</span> <span class='hs-varop'>&&&</span> <span class='hs-layout'>(</span><span class='hs-varop'><=</span> <span class='hs-varid'>c2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>|||</span> <span class='hs-varid'>normalRegChars</span> <span class='hs-varid'>cs</span>
<a name="line-72"></a><span class='hs-definition'>normalRegChars</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> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varop'>|||</span> <span class='hs-varid'>normalRegChars</span> <span class='hs-varid'>cs</span>
<a name="line-73"></a><span class='hs-definition'>normalRegChars</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
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