sgauthier
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127 lines
3.0 KiB
JavaScript
127 lines
3.0 KiB
JavaScript
'use strict'
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module.exports = toMdast
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var has = require('hast-util-has-property')
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var minify = require('rehype-minify-whitespace')
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var convert = require('unist-util-is/convert')
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var visit = require('unist-util-visit')
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var xtend = require('xtend')
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var one = require('./lib/one')
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var handlers = require('./lib/handlers')
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var own = require('./lib/util/own')
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var block = convert(['heading', 'paragraph', 'root'])
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function toMdast(tree, options) {
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var settings = options || {}
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var byId = {}
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var mdast
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h.nodeById = byId
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h.baseFound = false
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h.frozenBaseUrl = null
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h.wrapText = true
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h.qNesting = 0
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h.handlers = settings.handlers ? xtend(handlers, settings.handlers) : handlers
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h.augment = augment
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h.document = settings.document
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h.checked = settings.checked || '[x]'
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h.unchecked = settings.unchecked || '[ ]'
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h.quotes = settings.quotes || ['"']
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visit(tree, 'element', onelement)
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minify({newlines: settings.newlines === true})(tree)
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mdast = one(h, tree, null)
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visit(mdast, 'text', ontext)
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return mdast
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function h(node, type, props, children) {
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var result
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if (
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!children &&
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(typeof props === 'string' ||
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(typeof props === 'object' && 'length' in props))
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) {
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children = props
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props = {}
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}
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result = xtend({type: type}, props)
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if (typeof children === 'string') {
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result.value = children
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} else if (children) {
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result.children = children
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}
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return augment(node, result)
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}
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// To do: inline in a future major.
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// `right` is the finalized mdast node, created from `left`, a hast node.
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function augment(left, right) {
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if (left.position) {
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right.position = left.position
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}
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return right
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}
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function onelement(node) {
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var id = has(node, 'id') && String(node.properties.id).toUpperCase()
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if (id && !own.call(byId, id)) {
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byId[id] = node
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}
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}
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// Collapse text nodes, and fix whitespace.
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// Most of this is taken care of by `rehype-minify-whitespace`, but
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// we’re generating some whitespace too, and some nodes are in the end
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// ignored.
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// So clean up:
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function ontext(node, index, parent) {
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var previous = parent.children[index - 1]
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if (previous && node.type === previous.type) {
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previous.value += node.value
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parent.children.splice(index, 1)
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if (previous.position && node.position) {
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previous.position.end = node.position.end
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}
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// Iterate over the previous node again, to handle its total value.
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return index - 1
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}
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node.value = node.value.replace(/[\t ]*(\r?\n|\r)[\t ]*/, '$1')
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// We don’t care about other phrasing nodes in between (e.g., `[ asd ]()`),
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// as there the whitespace matters.
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if (block(parent)) {
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if (!index) {
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node.value = node.value.replace(/^[\t ]+/, '')
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}
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if (index === parent.children.length - 1) {
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node.value = node.value.replace(/[\t ]+$/, '')
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}
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}
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if (!node.value) {
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parent.children.splice(index, 1)
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return index
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}
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}
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}
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