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54 | ||
55 | <H2><A NAME="SECTION006430000000000000000"></A><A NAME="differ-objects"></A> | |
56 | <BR> | |
57 | 4.4.3 Differ Objects | |
58 | </H2> | |
59 | ||
60 | <P> | |
61 | Note that <tt class="class">Differ</tt>-generated deltas make no claim to be | |
62 | <strong>minimal</strong> diffs. To the contrary, minimal diffs are often | |
63 | counter-intuitive, because they synch up anywhere possible, sometimes | |
64 | accidental matches 100 pages apart. Restricting synch points to | |
65 | contiguous matches preserves some notion of locality, at the | |
66 | occasional cost of producing a longer diff. | |
67 | ||
68 | <P> | |
69 | The <tt class="class">Differ</tt> class has this constructor: | |
70 | ||
71 | <P> | |
72 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
73 | <td><nobr><b><span class="typelabel">class</span> <tt id='l2h-947' xml:id='l2h-947' class="class">Differ</tt></b>(</nobr></td> | |
74 | <td><var></var><big>[</big><var>linejunk</var><big>[</big><var>, charjunk</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt> | |
75 | <dd> | |
76 | Optional keyword parameters <var>linejunk</var> and <var>charjunk</var> are | |
77 | for filter functions (or <code>None</code>): | |
78 | ||
79 | <P> | |
80 | <var>linejunk</var>: A function that accepts a single string | |
81 | argument, and returns true if the string is junk. The default is | |
82 | <code>None</code>, meaning that no line is considered junk. | |
83 | ||
84 | <P> | |
85 | <var>charjunk</var>: A function that accepts a single character argument | |
86 | (a string of length 1), and returns true if the character is junk. | |
87 | The default is <code>None</code>, meaning that no character is | |
88 | considered junk. | |
89 | </dl> | |
90 | ||
91 | <P> | |
92 | <tt class="class">Differ</tt> objects are used (deltas generated) via a single | |
93 | method: | |
94 | ||
95 | <P> | |
96 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
97 | <td><nobr><b><tt id='l2h-948' xml:id='l2h-948' class="method">compare</tt></b>(</nobr></td> | |
98 | <td><var>a, b</var>)</td></tr></table></dt> | |
99 | <dd> | |
100 | Compare two sequences of lines, and generate the delta (a sequence | |
101 | of lines). | |
102 | ||
103 | <P> | |
104 | Each sequence must contain individual single-line strings ending | |
105 | with newlines. Such sequences can be obtained from the | |
106 | <tt class="method">readlines()</tt> method of file-like objects. The delta generated | |
107 | also consists of newline-terminated strings, ready to be printed as-is | |
108 | via the <tt class="method">writelines()</tt> method of a file-like object. | |
109 | </dl> | |
110 | ||
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