1Font::TTF::XMLparse(3)User Contributed Perl DocumentationFont::TTF::XMLparse(3)
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NAME

6       Font::TTF::XMLparse - provides support for XML parsing. Requires Expat
7       module XML::Parser::Expat
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SYNOPSIS

10           use Font::TTF::Font;
11           use Font::TTF::XMLparse;
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13           $f = Font::TTF::Font->new;
14           read_xml($f, $ARGV[0]);
15           $f->out($ARGV[1]);
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DESCRIPTION

18       This module contains the support routines for parsing XML and
19       generating the Truetype font structures as a result. The module has
20       been separated from the rest of the package in order to reduce the
21       dependency that this would bring, of the whole package on XML::Parser.
22       This way, people without the XML::Parser can still use the rest of the
23       package.
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25       The package interacts with another package through the use of a context
26       containing and element 'receiver' which is an object which can possibly
27       receive one of the following messages:
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29       XML_start
30           This message is called when an open tag occurs. It is called with
31           the context, tag name and the attributes. The return value has no
32           meaning.
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34       XML_end
35           This messages is called when a close tag occurs. It is called with
36           the context, tag name and attributes (held over from when the tag
37           was opened). There are 3 possible return values from such a
38           message:
39
40           undef   This is the default return value indicating that default
41                   processing should occur in which either the current element
42                   on the tree, or the text of this element should be stored
43                   in the parent object.
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45           $context
46                   This magic value marks that the element should be deleted
47                   from the parent.  Nothing is stored in the parent. (This
48                   rather than '' is used to allow 0 returns.)
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50           anything
51                   Anything else is taken as the element content to be stored
52                   in the parent.
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54           In addition, the context hash passed to these messages contains the
55           following keys:
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57           xml This is the expat xml object. The context is also available as
58               $context->{'xml'}{' mycontext'}. But that is a long winded way
59               of not saying much!
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61           font
62               This is the base object that was passed in for XML parsing.
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64           receiver
65               This holds the current receiver of parsing events. It may be
66               set in associated application to adjust which objects should
67               receive messages when. It is also stored in the parsing stack
68               to ensure that where an object changes it during XML_start,
69               that that same object that received XML_start will receive the
70               corresponding XML_end
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72           stack
73               This is the parsing stack, used internally to hold the current
74               receiver and attributes for each element open, as a complete
75               hierarchy back to the root element.
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77           tree
78               This element contains the storage tree corresponding to the
79               parent of each element in the stack. The default action is to
80               push undef onto this stack during XML_start and then to resolve
81               this, either in the associated application (by changing
82               $context->{'tree'}[-1]) or during XML_end of a child element,
83               by which time we know whether we are dealing with an array or a
84               hash or what.
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86           text
87               Character processing is to insert all the characters into the
88               text element of the context for available use later.
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METHODS

AUTHOR

92       Martin Hosken <http://scripts.sil.org/FontUtils>.
93

LICENSING

95       Copyright (c) 1998-2016, SIL International (http://www.sil.org)
96
97       This module is released under the terms of the Artistic License 2.0.
98       For details, see the full text of the license in the file LICENSE.
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102perl v5.28.0                      2016-08-03            Font::TTF::XMLparse(3)
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