base/qquad-drop

Level

AuthoringFaithfulCorpusEquivOnly Equiv applies this rule; its output is intended for comparison.

Fidelity

readingPreserves notation, reading order, and structural roles.

Package

base

Source

base/equiv/spacing_drop/qquad_drop.rs (opens in new tab)

Triggers

\qquad command

Eliminates

\qquad command

Rewrite patterns#

1. math-qquad\qquad∅ removed
2. text-qquad-run\qquad\qquad

Examples#

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

A\qquad B

AB

\text{A\qquad\qquad B}

\text{A B}

\text{A\qquad B}

\text{A B}

Related rules#

Upstream rules#

• base/double-quad-to-qquad Merge two adjacent quads into one qquad for authoring normalization.

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/quad-drop Drop quad in math mode and collapse each text-mode quad run to one ordinary space.
• base/mkern-to-mspace Collapse mkern to the explicit mspace command.
• base/mskip-to-mspace Collapse mskip to the explicit mspace command.

Notes#

Owns the shared qquad target across base/math and textmacros/text active records. In math mode, remove every qquad, including singletons. In text mode, replace each maximal adjacent run of one or more qquad commands with one ordinary text space. Authoring-level double-quad-to-qquad may produce qquad; this rule eliminates that downstream target in Equiv, so applying or omitting the canonicalization does not change the final Equiv normal form. Do not cross groups, arguments, scripts, environment cells, slots, modes, or non-Spacer nodes.

Disable this rule#

TransformEngine(profile="corpus", disable_rules=["base/qquad-drop"])

new TransformEngine({ profile: 'corpus', disableRules: ['base/qquad-drop'] })

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