LaTeXM...:Gullet(3pm)

💅 NAME 💅

okay so bestie, this is the LaTeXM...:Gullet(3pm) page — User Contributed Perl Documentation — and the main character is LaTeXML::Core::Gullet, the class that expands expandable tokens and parses common token sequences. slay.

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✨ DESCRIPTION ✨

A LaTeXML::Core::Gullet reads tokens (LaTeXML::Core::Token) from a LaTeXML::Core::Mouth. It is responsible for expanding macros and expandable control sequences if the current definition associated with the token in LaTeXML::Core::State is an LaTeXML::Core::Definition::Expandable definition. It also provides a whole lineup of methods for reading input like arguments and optional arguments, plus parsing LaTeXML::Common::Number, LaTeXML::Common::Dimension, etc, according to TeX's rules. no cap.

It extends LaTeXML::Common::Object.

🫶 Managing Input 🫶

• $gullet->openMouth($mouth, $noautoclose); — the manpage literally asks “Is this public?” It prepares to read tokens from $mouth. If $noautoclose is true, the Mouth will not be automatically closed when it is exhausted.
• $gullet->closeMouth; — yep, another “Is this public?” It finishes reading from the current mouth, and reverts to the one in effect before the last openMouth.
• $gullet->flush; — also asks “Is this public?” It clears all inputs. bye-bye, input pile 💀
• $gullet->getLocator; — returns an object describing the current location in the input stream.

🧚 Low-level methods 🧚

• $tokens = $gullet->expandTokens($tokens); — returns the LaTeXML::Core::Tokens resulting from expanding all the tokens in $tokens. This is actually only used in a few circumstances where the arguments to an expandable need explicit expansion; usually expansion happens at the right time.
• $token = $gullet->readToken; — returns the next token from the input source, or undef if there is no more input.
• $token = $gullet->readXToken($toplevel,$commentsok); — returns the next unexpandable token from the input source, or undef if there is no more input. If the next token is expandable, it is expanded, and its expansion is reinserted into the input. If $commentsok, a comment read or pending will be returned.
• $gullet->unread(@tokens); — pushes the @tokens back into the input stream to be re-read. rewind era.

🌸 Mid-level methods 🌸

• $token = $gullet->readNonSpace; — reads and returns the next non-space token from the input after discarding any spaces.
• $gullet->skipSpaces; — skips the next spaces from the input.
• $gullet->skip1Space($expanded); — skips the next token from the input if it is a space. If C($expanded> is true, expands (like " <one optional space" >).
• $tokens = $gullet->readBalanced; — reads a sequence of tokens from the input until the balancing '}' (assuming the '{' has already been read). Returns a LaTeXML::Core::Tokens, except in an array context, returns the collected tokens and the closing token.
• $boole = $gullet->ifNext($token); — returns true if the next token in the input matches $token; the possibly matching token remains in the input.
• $tokens = $gullet->readMatch(@choices); — reads and returns whichever of @choices matches the input, or undef if none do. Each of the choices is an LaTeXML::Core::Tokens.
• $keyword = $gullet->readKeyword(@keywords); — reads and returns whichever of @keywords (each a string) matches the input, or undef if none do. This is similar to readMatch, but case and catcodes are ignored. Also, leading spaces are skipped.
• $tokens = $gullet->readUntil(@delims); — reads and returns a (balanced) sequence of LaTeXML::Core::Tokens until matching one of the tokens in @delims. In a list context, it also returns which of the delimiters ended the sequence.

🦋 High-level methods 🦋

• $tokens = $gullet->readArg; — reads and returns a TeX argument; the next Token or Tokens (if surrounded by braces).
• $tokens = $gullet->readOptional($default); — reads and returns a LaTeX optional argument; returns $default if there is no '[', otherwise the contents of the [].
• $thing = $gullet->readValue($type); — reads an argument of a given type: one of 'Number', 'Dimension', 'Glue', 'MuGlue' or 'any'.
• $value = $gullet->readRegisterValue($type); — reads a control sequence token (and possibly its arguments) that names a register, and returns the value. Returns undef if the next token isn't such a register.
• $number = $gullet->readNumber; — reads a LaTeXML::Common::Number according to TeX's rules of the various things that can be used as a numerical value.
• $dimension = $gullet->readDimension; — reads a LaTeXML::Common::Dimension according to TeX's rules of the various things that can be used as a dimension value.
• $mudimension = $gullet->readMuDimension; — reads a LaTeXML::Core::MuDimension according to TeX's rules of the various things that can be used as a mudimension value.
• $glue = $gullet->readGlue; — reads a LaTeXML::Common::Glue according to TeX's rules of the various things that can be used as a glue value.
• $muglue = $gullet->readMuGlue; — reads a LaTeXML::Core::MuGlue according to TeX's rules of the various things that can be used as a muglue value. numbers and glue, handled. periodt.

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🌈 AUTHOR 🌈

Bruce Miller <bruce.miller@nist.gov> — that's the author section, bestie. iconic.

🎀 COPYRIGHT 🎀

Public domain software, produced as part of work done by the United States Government & not subject to copyright in the US.

mwah 💋 — this page is perl v5.40.1, dated 2025-11-16, and it lives under LaTeXM...:Gullet(3pm).