40 lines
1 KiB
JavaScript
40 lines
1 KiB
JavaScript
import {toString} from 'nlcst-to-string'
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import {modifyChildren} from 'unist-util-modify-children'
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// Merge certain punctuation marks into their preceding words.
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export const mergeFinalWordSymbol = modifyChildren(function (
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child,
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index,
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parent
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) {
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if (
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index > 0 &&
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(child.type === 'SymbolNode' || child.type === 'PunctuationNode') &&
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toString(child) === '-'
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) {
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const children = parent.children
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const previous = children[index - 1]
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const next = children[index + 1]
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if (
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(!next || next.type !== 'WordNode') &&
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previous &&
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previous.type === 'WordNode'
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) {
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// Remove `child` from parent.
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children.splice(index, 1)
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// Add the punctuation mark at the end of the previous node.
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previous.children.push(child)
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// Update position.
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if (previous.position && child.position) {
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previous.position.end = child.position.end
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}
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// Next, iterate over the node *now* at the current position (which was
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// the next node).
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return index
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}
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}
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})
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