author | johnathan.white@2718R8BGH51.accenture.com |
Mon, 08 Mar 2010 18:45:03 +0000 | |
changeset 46 | b6935a90ca64 |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`formatter` --- Generic output formatting |
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============================================== |
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.. module:: formatter |
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:synopsis: Generic output formatter and device interface. |
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.. index:: single: HTMLParser (class in htmllib) |
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This module supports two interface definitions, each with multiple |
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implementations. The *formatter* interface is used by the :class:`HTMLParser` |
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class of the :mod:`htmllib` module, and the *writer* interface is required by |
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the formatter interface. |
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Formatter objects transform an abstract flow of formatting events into specific |
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output events on writer objects. Formatters manage several stack structures to |
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allow various properties of a writer object to be changed and restored; writers |
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need not be able to handle relative changes nor any sort of "change back" |
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operation. Specific writer properties which may be controlled via formatter |
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objects are horizontal alignment, font, and left margin indentations. A |
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mechanism is provided which supports providing arbitrary, non-exclusive style |
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settings to a writer as well. Additional interfaces facilitate formatting |
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events which are not reversible, such as paragraph separation. |
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Writer objects encapsulate device interfaces. Abstract devices, such as file |
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formats, are supported as well as physical devices. The provided |
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implementations all work with abstract devices. The interface makes available |
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mechanisms for setting the properties which formatter objects manage and |
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inserting data into the output. |
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.. _formatter-interface: |
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The Formatter Interface |
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----------------------- |
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Interfaces to create formatters are dependent on the specific formatter class |
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being instantiated. The interfaces described below are the required interfaces |
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which all formatters must support once initialized. |
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One data element is defined at the module level: |
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.. data:: AS_IS |
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Value which can be used in the font specification passed to the ``push_font()`` |
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method described below, or as the new value to any other ``push_property()`` |
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method. Pushing the ``AS_IS`` value allows the corresponding ``pop_property()`` |
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method to be called without having to track whether the property was changed. |
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The following attributes are defined for formatter instance objects: |
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.. attribute:: formatter.writer |
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The writer instance with which the formatter interacts. |
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.. method:: formatter.end_paragraph(blanklines) |
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Close any open paragraphs and insert at least *blanklines* before the next |
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paragraph. |
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.. method:: formatter.add_line_break() |
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Add a hard line break if one does not already exist. This does not break the |
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logical paragraph. |
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.. method:: formatter.add_hor_rule(*args, **kw) |
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Insert a horizontal rule in the output. A hard break is inserted if there is |
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data in the current paragraph, but the logical paragraph is not broken. The |
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arguments and keywords are passed on to the writer's :meth:`send_line_break` |
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method. |
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.. method:: formatter.add_flowing_data(data) |
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Provide data which should be formatted with collapsed whitespace. Whitespace |
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from preceding and successive calls to :meth:`add_flowing_data` is considered as |
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well when the whitespace collapse is performed. The data which is passed to |
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this method is expected to be word-wrapped by the output device. Note that any |
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word-wrapping still must be performed by the writer object due to the need to |
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rely on device and font information. |
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.. method:: formatter.add_literal_data(data) |
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Provide data which should be passed to the writer unchanged. Whitespace, |
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including newline and tab characters, are considered legal in the value of |
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*data*. |
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.. method:: formatter.add_label_data(format, counter) |
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Insert a label which should be placed to the left of the current left margin. |
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This should be used for constructing bulleted or numbered lists. If the |
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*format* value is a string, it is interpreted as a format specification for |
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*counter*, which should be an integer. The result of this formatting becomes the |
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value of the label; if *format* is not a string it is used as the label value |
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directly. The label value is passed as the only argument to the writer's |
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:meth:`send_label_data` method. Interpretation of non-string label values is |
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dependent on the associated writer. |
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|
108 |
Format specifications are strings which, in combination with a counter value, |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
109 |
are used to compute label values. Each character in the format string is copied |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
110 |
to the label value, with some characters recognized to indicate a transform on |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
111 |
the counter value. Specifically, the character ``'1'`` represents the counter |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
112 |
value formatter as an Arabic number, the characters ``'A'`` and ``'a'`` |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
113 |
represent alphabetic representations of the counter value in upper and lower |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
114 |
case, respectively, and ``'I'`` and ``'i'`` represent the counter value in Roman |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
115 |
numerals, in upper and lower case. Note that the alphabetic and roman |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
116 |
transforms require that the counter value be greater than zero. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
117 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
118 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
119 |
.. method:: formatter.flush_softspace() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
120 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
121 |
Send any pending whitespace buffered from a previous call to |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
122 |
:meth:`add_flowing_data` to the associated writer object. This should be called |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
123 |
before any direct manipulation of the writer object. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
124 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
125 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
126 |
.. method:: formatter.push_alignment(align) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
127 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
128 |
Push a new alignment setting onto the alignment stack. This may be |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
129 |
:const:`AS_IS` if no change is desired. If the alignment value is changed from |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
130 |
the previous setting, the writer's :meth:`new_alignment` method is called with |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
131 |
the *align* value. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
132 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
133 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
134 |
.. method:: formatter.pop_alignment() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
135 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
136 |
Restore the previous alignment. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
137 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
138 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
139 |
.. method:: formatter.push_font((size, italic, bold, teletype)) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
140 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
141 |
Change some or all font properties of the writer object. Properties which are |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
142 |
not set to :const:`AS_IS` are set to the values passed in while others are |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
143 |
maintained at their current settings. The writer's :meth:`new_font` method is |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
144 |
called with the fully resolved font specification. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
145 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
146 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
147 |
.. method:: formatter.pop_font() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
148 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
149 |
Restore the previous font. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
150 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
151 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
152 |
.. method:: formatter.push_margin(margin) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
153 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
154 |
Increase the number of left margin indentations by one, associating the logical |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
155 |
tag *margin* with the new indentation. The initial margin level is ``0``. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
156 |
Changed values of the logical tag must be true values; false values other than |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
157 |
:const:`AS_IS` are not sufficient to change the margin. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
158 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
159 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
160 |
.. method:: formatter.pop_margin() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
161 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
162 |
Restore the previous margin. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
163 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
164 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
165 |
.. method:: formatter.push_style(*styles) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
166 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
167 |
Push any number of arbitrary style specifications. All styles are pushed onto |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
168 |
the styles stack in order. A tuple representing the entire stack, including |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
169 |
:const:`AS_IS` values, is passed to the writer's :meth:`new_styles` method. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
170 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
171 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
172 |
.. method:: formatter.pop_style([n=1]) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
173 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
174 |
Pop the last *n* style specifications passed to :meth:`push_style`. A tuple |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
175 |
representing the revised stack, including :const:`AS_IS` values, is passed to |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
176 |
the writer's :meth:`new_styles` method. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
177 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
178 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
179 |
.. method:: formatter.set_spacing(spacing) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
180 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
181 |
Set the spacing style for the writer. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
182 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
183 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
184 |
.. method:: formatter.assert_line_data([flag=1]) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
185 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
186 |
Inform the formatter that data has been added to the current paragraph |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
187 |
out-of-band. This should be used when the writer has been manipulated |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
188 |
directly. The optional *flag* argument can be set to false if the writer |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
189 |
manipulations produced a hard line break at the end of the output. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
190 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
191 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
192 |
.. _formatter-impls: |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
193 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
194 |
Formatter Implementations |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
195 |
------------------------- |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
196 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
197 |
Two implementations of formatter objects are provided by this module. Most |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
198 |
applications may use one of these classes without modification or subclassing. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
199 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
200 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
201 |
.. class:: NullFormatter([writer]) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
202 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
203 |
A formatter which does nothing. If *writer* is omitted, a :class:`NullWriter` |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
204 |
instance is created. No methods of the writer are called by |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
205 |
:class:`NullFormatter` instances. Implementations should inherit from this |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
206 |
class if implementing a writer interface but don't need to inherit any |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
207 |
implementation. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
208 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
209 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
210 |
.. class:: AbstractFormatter(writer) |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
211 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
212 |
The standard formatter. This implementation has demonstrated wide applicability |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
213 |
to many writers, and may be used directly in most circumstances. It has been |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
214 |
used to implement a full-featured World Wide Web browser. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
215 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
216 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
217 |
.. _writer-interface: |
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The Writer Interface |
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-------------------- |
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Interfaces to create writers are dependent on the specific writer class being |
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instantiated. The interfaces described below are the required interfaces which |
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all writers must support once initialized. Note that while most applications can |
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use the :class:`AbstractFormatter` class as a formatter, the writer must |
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typically be provided by the application. |
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.. method:: writer.flush() |
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Flush any buffered output or device control events. |
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.. method:: writer.new_alignment(align) |
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Set the alignment style. The *align* value can be any object, but by convention |
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is a string or ``None``, where ``None`` indicates that the writer's "preferred" |
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alignment should be used. Conventional *align* values are ``'left'``, |
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``'center'``, ``'right'``, and ``'justify'``. |
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.. method:: writer.new_font(font) |
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Set the font style. The value of *font* will be ``None``, indicating that the |
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device's default font should be used, or a tuple of the form ``(size, |
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italic, bold, teletype)``. Size will be a string indicating the size of |
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font that should be used; specific strings and their interpretation must be |
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defined by the application. The *italic*, *bold*, and *teletype* values are |
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Boolean values specifying which of those font attributes should be used. |
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.. method:: writer.new_margin(margin, level) |
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Set the margin level to the integer *level* and the logical tag to *margin*. |
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Interpretation of the logical tag is at the writer's discretion; the only |
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restriction on the value of the logical tag is that it not be a false value for |
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non-zero values of *level*. |
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|
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.. method:: writer.new_spacing(spacing) |
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Set the spacing style to *spacing*. |
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.. method:: writer.new_styles(styles) |
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|
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Set additional styles. The *styles* value is a tuple of arbitrary values; the |
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value :const:`AS_IS` should be ignored. The *styles* tuple may be interpreted |
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either as a set or as a stack depending on the requirements of the application |
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and writer implementation. |
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|
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.. method:: writer.send_line_break() |
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|
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Break the current line. |
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|
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.. method:: writer.send_paragraph(blankline) |
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|
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Produce a paragraph separation of at least *blankline* blank lines, or the |
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equivalent. The *blankline* value will be an integer. Note that the |
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implementation will receive a call to :meth:`send_line_break` before this call |
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if a line break is needed; this method should not include ending the last line |
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of the paragraph. It is only responsible for vertical spacing between |
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paragraphs. |
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286 |
|
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287 |
|
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.. method:: writer.send_hor_rule(*args, **kw) |
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|
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Display a horizontal rule on the output device. The arguments to this method |
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are entirely application- and writer-specific, and should be interpreted with |
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care. The method implementation may assume that a line break has already been |
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issued via :meth:`send_line_break`. |
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|
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|
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.. method:: writer.send_flowing_data(data) |
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|
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Output character data which may be word-wrapped and re-flowed as needed. Within |
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any sequence of calls to this method, the writer may assume that spans of |
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multiple whitespace characters have been collapsed to single space characters. |
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301 |
|
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|
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.. method:: writer.send_literal_data(data) |
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|
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Output character data which has already been formatted for display. Generally, |
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this should be interpreted to mean that line breaks indicated by newline |
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characters should be preserved and no new line breaks should be introduced. The |
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data may contain embedded newline and tab characters, unlike data provided to |
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the :meth:`send_formatted_data` interface. |
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|
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311 |
|
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.. method:: writer.send_label_data(data) |
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|
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Set *data* to the left of the current left margin, if possible. The value of |
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*data* is not restricted; treatment of non-string values is entirely |
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application- and writer-dependent. This method will only be called at the |
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beginning of a line. |
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318 |
|
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319 |
|
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.. _writer-impls: |
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321 |
|
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Writer Implementations |
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---------------------- |
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|
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Three implementations of the writer object interface are provided as examples by |
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this module. Most applications will need to derive new writer classes from the |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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changeset
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327 |
:class:`NullWriter` class. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
328 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
329 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
330 |
.. class:: NullWriter() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
331 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
332 |
A writer which only provides the interface definition; no actions are taken on |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
333 |
any methods. This should be the base class for all writers which do not need to |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
334 |
inherit any implementation methods. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
335 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
336 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
337 |
.. class:: AbstractWriter() |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
changeset
|
338 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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changeset
|
339 |
A writer which can be used in debugging formatters, but not much else. Each |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
340 |
method simply announces itself by printing its name and arguments on standard |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
341 |
output. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
342 |
|
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
343 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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344 |
.. class:: DumbWriter([file[, maxcol=72]]) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
345 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff
changeset
|
346 |
Simple writer class which writes output on the file object passed in as *file* |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
347 |
or, if *file* is omitted, on standard output. The output is simply word-wrapped |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
348 |
to the number of columns specified by *maxcol*. This class is suitable for |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
349 |
reflowing a sequence of paragraphs. |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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changeset
|
350 |