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feat: \nonumber/\notag support, \tag per row of {align} (#2952)

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* feat: \nonumber and \notag support

Support `\nonumber` (and equivalent `\notag`) using a global macro
`\@eqnsw` to track whether one occurs in each row, similar to how
amsmath uses global `\@eqnswtrue`/`\@eqnswfalse`.

Fix #2950

* Remove duplicate mention of align*

* Working version of \tag within {align}

* Simpler subparse mechanism

* Fix flow errors, clarifying set-to-undefined

* Document that \tag works in rows

* Add screenshot tests

* Add Jest tests

* Add Safari screenshot

* Commit message about fixing \tag

Fixes #2379

* Apply suggestions from code review

Co-authored-by: ylemkimon <y@ylem.kim>

* Revise and move getAutoTag

* Fix handling of split

* Remove unnecessary feedTokens

Co-authored-by: ylemkimon <y@ylem.kim>

Co-authored-by: ylemkimon <y@ylem.kim>
This commit is contained in:
Erik Demaine
2021-10-31 17:40:06 -04:00
committed by GitHub
parent a59135fd77
commit 52c4778b15
12 changed files with 131 additions and 29 deletions
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13
src/Namespace.js
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@@ -15,7 +15,7 @@ export type Mapping<Value> = {[string]: Value};
export default class Namespace<Value> {
current: Mapping<Value>;
builtins: Mapping<Value>;
undefStack: Mapping<Value>[];
undefStack: Mapping<?Value>[];
/**
* Both arguments are optional. The first argument is an object of
@@ -48,7 +48,7 @@ export default class Namespace<Value> {
const undefs = this.undefStack.pop();
for (const undef in undefs) {
if (undefs.hasOwnProperty(undef)) {
if (undefs[undef] === undefined) {
if (undefs[undef] == null) {
delete this.current[undef];
} else {
this.current[undef] = undefs[undef];
@@ -97,8 +97,9 @@ export default class Namespace<Value> {
* Local set() sets the current value and (when appropriate) adds an undo
* operation to the undo stack. Global set() may change the undo
* operation at every level, so takes time linear in their number.
* A value of undefined means to delete existing definitions.
*/
set(name: string, value: Value, global: boolean = false) {
set(name: string, value: ?Value, global: boolean = false) {
if (global) {
// Global set is equivalent to setting in all groups. Simulate this
// by destroying any undos currently scheduled for this name,
@@ -119,6 +120,10 @@ export default class Namespace<Value> {
top[name] = this.current[name];
}
}
this.current[name] = value;
if (value == null) {
delete this.current[name];
} else {
this.current[name] = value;
}
}
}