47 lines
1.1 KiB
JavaScript
47 lines
1.1 KiB
JavaScript
'use strict'
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var toString = require('nlcst-to-string')
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var modifyChildren = require('unist-util-modify-children')
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module.exports = modifyChildren(mergeInitialWordSymbol)
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// Merge certain punctuation marks into their following words.
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function mergeInitialWordSymbol(child, index, parent) {
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var children
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var next
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if (
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(child.type !== 'SymbolNode' && child.type !== 'PunctuationNode') ||
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toString(child) !== '&'
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) {
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return
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}
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children = parent.children
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next = children[index + 1]
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// If either a previous word, or no following word, exists, exit early.
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if (
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(index !== 0 && children[index - 1].type === 'WordNode') ||
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!(next && next.type === 'WordNode')
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) {
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return
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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 start of the next node.
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next.children.unshift(child)
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// Update position.
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if (next.position && child.position) {
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next.position.start = child.position.start
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}
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// Next, iterate over the node at the previous position, as it's now adjacent
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// to a following word.
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return index - 1
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}
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