1LaTeXML::Core::Stomach(U3s)er Contributed Perl DocumentatLiaoTneXML::Core::Stomach(3)
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NAME

6       "LaTeXML::Core::Stomach" - digests tokens into boxes, lists, etc.
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DESCRIPTION

9       "LaTeXML::Core::Stomach" digests tokens read from a
10       LaTeXML::Core::Gullet (they will have already been expanded).
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12       It extends LaTeXML::Common::Object.
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14       There are basically four cases when digesting a LaTeXML::Core::Token:
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16       A plain character
17           is simply converted to a LaTeXML::Core::Box recording the current
18           LaTeXML::Common::Font.
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20       A primitive
21           If a control sequence represents
22           LaTeXML::Core::Definition::Primitive, the primitive is invoked,
23           executing its stored subroutine.  This is typically done for side
24           effect (changing the state in the LaTeXML::Core::State), although
25           they may also contribute digested material.  As with macros, any
26           arguments to the primitive are read from the LaTeXML::Core::Gullet.
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28       Grouping (or environment bodies)
29           are collected into a LaTeXML::Core::List.
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31       Constructors
32           A special class of control sequence, called a
33           LaTeXML::Core::Definition::Constructor produces a
34           LaTeXML::Core::Whatsit which remembers the control sequence and
35           arguments that created it, and defines its own translation into
36           "XML" elements, attributes and data.  Arguments to a constructor
37           are read from the gullet and also digested.
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39   Digestion
40       "$list = $stomach->digestNextBody;"
41           Return the digested LaTeXML::Core::List after reading and digesting
42           a `body' from the its Gullet.  The body extends until the current
43           level of boxing or environment is closed.
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45       "$list = $stomach->digest($tokens);"
46           Return the LaTeXML::Core::List resuting from digesting the given
47           tokens.  This is typically used to digest arguments to primitives
48           or constructors.
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50       "@boxes = $stomach->invokeToken($token);"
51           Invoke the given (expanded) token.  If it corresponds to a
52           Primitive or Constructor, the definition will be invoked, reading
53           any needed arguments fromt he current input source.  Otherwise, the
54           token will be digested.  A List of Box's, Lists, Whatsit's is
55           returned.
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57       "@boxes = $stomach->regurgitate;"
58           Removes and returns a list of the boxes already digested at the
59           current level.  This peculiar beast is used by things like \choose
60           (which is a Primitive in TeX, but a Constructor in LaTeXML).
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62   Grouping
63       "$stomach->bgroup;"
64           Begin a new level of binding by pushing a new stack frame, and a
65           new level of boxing the digested output.
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67       "$stomach->egroup;"
68           End a level of binding by popping the last stack frame, undoing
69           whatever bindings appeared there, and also decrementing the level
70           of boxing.
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72       "$stomach->begingroup;"
73           Begin a new level of binding by pushing a new stack frame.
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75       "$stomach->endgroup;"
76           End a level of binding by popping the last stack frame, undoing
77           whatever bindings appeared there.
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79   Modes
80       "$stomach->beginMode($mode);"
81           Begin processing in $mode; one of 'text', 'display-math' or
82           'inline-math'.  This also begins a new level of grouping and
83           switches to a font appropriate for the mode.
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85       "$stomach->endMode($mode);"
86           End processing in $mode; an error is signalled if $stomach is not
87           currently in $mode.  This also ends a level of grouping.
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AUTHOR

90       Bruce Miller <bruce.miller@nist.gov>
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93       Public domain software, produced as part of work done by the United
94       States Government & not subject to copyright in the US.
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98perl v5.34.0                      2021-11-24         LaTeXML::Core::Stomach(3)
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