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55 | <H1><A NAME="SECTION0014100000000000000000"> | |
56 | 12.1 <tt class="module">formatter</tt> -- | |
57 | Generic output formatting</A> | |
58 | </H1> | |
59 | ||
60 | <P> | |
61 | <A NAME="module-formatter"></A> | |
62 | ||
63 | <P> | |
64 | This module supports two interface definitions, each with multiple | |
65 | implementations. The <em>formatter</em> interface is used by the | |
66 | <tt class="class">HTMLParser</tt> class of the <tt class="module"><a href="module-htmllib.html">htmllib</a></tt> module, and the | |
67 | <em>writer</em> interface is required by the formatter interface. | |
68 | <a id='l2h-3790' xml:id='l2h-3790'></a> | |
69 | <P> | |
70 | Formatter objects transform an abstract flow of formatting events into | |
71 | specific output events on writer objects. Formatters manage several | |
72 | stack structures to allow various properties of a writer object to be | |
73 | changed and restored; writers need not be able to handle relative | |
74 | changes nor any sort of ``change back'' operation. Specific writer | |
75 | properties which may be controlled via formatter objects are | |
76 | horizontal alignment, font, and left margin indentations. A mechanism | |
77 | is provided which supports providing arbitrary, non-exclusive style | |
78 | settings to a writer as well. Additional interfaces facilitate | |
79 | formatting events which are not reversible, such as paragraph | |
80 | separation. | |
81 | ||
82 | <P> | |
83 | Writer objects encapsulate device interfaces. Abstract devices, such | |
84 | as file formats, are supported as well as physical devices. The | |
85 | provided implementations all work with abstract devices. The | |
86 | interface makes available mechanisms for setting the properties which | |
87 | formatter objects manage and inserting data into the output. | |
88 | ||
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