base/mkern-to-mspace

Level

AuthoringFaithfulCorpusEquivFaithful, Corpus, and Equiv apply this rule.

Fidelity

readingPreserves notation, reading order, and structural roles.

Package

base

Source

base/faithful/spacing_alias/mkern_to_mspace.rs (opens in new tab)

Triggers

\mkern command

Eliminates

\mkern command

Produces

\mspace command

Rewrite patterns#

1. \mkern #1\mspace{#1}

Examples#

Each example shows this rule applied in isolation. A complete normalization profile may make additional changes.

\text{A\mkern 1em B}

\text{A\mspace{1em}B}

A\mkern 2mu B

A\mspace{2mu} B

\text{A\mkern{1em} B}

\text{A\mspace{1em}B}

Related rules#

Same family#

• ams/nobreakspace-to-tilde Collapse nobreakspace to the canonical nonbreaking space token.
• base/break-to-linebreak Collapse break to the explicit linebreak command.
• base/newline-to-linebreak Collapse newline to the explicit linebreak command.
• base/control-space-to-tilde Rewrite math-mode control space to the canonical active space token.
• base/gt-space-to-colon-space Collapse \> to the canonical medium math space command \:
• base/hfil-to-hfill Collapse hfil to the canonical hfill command under MathJax spacing semantics.
• base/hfilll-to-hfill Collapse hfilll to the canonical hfill command.
• base/hskip-to-hspace Collapse hskip to the explicit hspace command.
• base/negthinspace-to-neg-comma-space Collapse negthinspace to the explicit negative thin math space command.
• base/space-to-tilde Collapse space to the explicit nonbreaking space token.
• base/thinspace-to-comma-space Collapse thinspace to the explicit thin math space command.
• base/double-enspace-to-quad Rewrite two adjacent enspaces to one exact-width quad.
• base/double-quad-to-qquad Merge two adjacent quads into one qquad for authoring normalization.
• base/small-spacer-merge-to-enspace Merge exact half-em small-spacer chunks into enspace in one pass.
• base/allowbreak-drop Drop allowbreak as a pure linebreak hint during cleanup-oriented normalization.
• base/badbreak-drop Drop badbreak as a pure linebreak hint during cleanup-oriented normalization.
• base/goodbreak-drop Drop goodbreak as a pure linebreak hint during cleanup-oriented normalization.
• base/mathstrut-drop Drop the invisible mathstrut layout helper in cleanup-oriented normalization.
• base/nobreak-drop Drop nobreak as a pure linebreak hint during cleanup-oriented normalization.
• base/strut-drop Drop the fixed empty strut node in cleanup-oriented normalization.
• base/enspace-drop Drop enspace in math mode and collapse each text-mode enspace run to one ordinary space.
• base/qquad-drop Drop qquad in math mode and collapse each text-mode qquad run to one ordinary space.
• base/quad-drop Drop quad in math mode and collapse each text-mode quad run to one ordinary space.
• base/mskip-to-mspace Collapse mskip to the explicit mspace command.

Notes#

MathJax base/math gives \mkern a nobreak flag that \mspace does not preserve. In text content, MathJax's unbraced dimension scanner also consumes one ASCII space after the unit, while a braced dimension preserves it; TeXForm's AST cannot distinguish those scalar source forms, so canonicalizing the common primitive form can drop an intentional space after a braced argument. Both gaps make worst-case fidelity approximate. The base record owns this name by package import order.

Disable this rule#

TransformEngine(profile="corpus", disable_rules=["base/mkern-to-mspace"])

new TransformEngine({ profile: 'corpus', disableRules: ['base/mkern-to-mspace'] })

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