Press n or j to go to the next uncovered block, b, p or k for the previous block.
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const _voidElements = new Set(['area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source', 'track', 'wbr'])
const END = Symbol('end')
function _readValueParts (arr, regex) {
const out = []
let ss = []
while (arr.i < arr.length) {
const c = arr[arr.i]
if (c.isValue) {
if (ss.length) {
out.push({ type: 'part', value: ss.join('') })
ss = []
}
out.push(c.value)
arr.i++
} else if (c.match(regex)) {
if (ss.length) {
out.push({ type: 'part', value: ss.join('') })
}
return out
} else if (c === '&') {
ss.push(readEscaped(arr))
} else {
ss.push(c)
arr.i++
}
}
}
function _decodeAttribute (arr) {
skipWhiteSpace(arr)
const c = arr[arr.i]
if (c === '/' || c === '>') {
return END
}
let name = readValue(arr)
if (name && name.isValue) {
return name.value
}
name = readTo(arr, /[\s=/>]/)
if (!name) {
throw new Error('attribute must have a name (dynamic attributes okay, dynamic names... sorry)')
}
skipWhiteSpace(arr)
const equalSign = readIf(arr, '=')
if (equalSign) {
skipWhiteSpace(arr)
let value = readValue(arr)
if (value) {
value = value.value
} else {
const quote = readIf(arr, /['"]/)
if (quote) {
value = _readValueParts(arr, quote)
assertChar(arr, quote)
} else {
value = readTo(arr, /[\s=/>]/)
}
}
return { type: 'attribute', name, value }
} else {
return { type: 'attribute', name }
}
}
function _decodeAttributes (arr) {
const attributes = []
while (true) {
const attribute = _decodeAttribute(arr)
if (attribute !== END) {
attributes.push(attribute)
} else {
return attributes
}
}
}
function _decodeTag (arr) {
skipWhiteSpace(arr)
const c = arr[arr.i]
if (c.isValue) {
arr.i++
return c.value
}
return readTo(arr, /[\s/>]/)
}
function _decodeElement (arr) {
const c = arr[arr.i]
if (c.isValue) {
arr.i++
return c.value
} else if (c === '<') {
assertChar(arr, /</)
const isClosing = readIf(arr, '/')
const tag = _decodeTag(arr)
const isVoid = _voidElements.has(tag)
const attributes = _decodeAttributes(arr)
const isEmpty = readIf(arr, '/') || isVoid
assertChar(arr, />/)
const children = (isClosing || isEmpty) ? [] : _decodeElements(arr, tag)
if (isVoid && isClosing) return null
return { type: 'node', tag, attributes, children, isClosing }
} else {
return { type: 'textnode', value: readTo(arr, /</) }
}
}
function _decodeElements (arr, closingTag) {
const nodes = []
while (arr.i < arr.length) {
const node = _decodeElement(arr)
if (node != null) {
if (node.isClosing) {
if (closingTag != null) {
return nodes
}
} else {
delete node.isClosing
nodes.push(node)
}
}
}
return [].concat.apply([], nodes)
}
export function h (strings, ...values) {
const ss = [strings[0].split('')]
for (let i = 0; i < values.length; i++) {
ss.push({ value: values[i], isValue: true })
ss.push(strings[i + 1].split(''))
}
const arr = [].concat.apply([], ss)
arr.i = 0
return _decodeElements(arr, null)
}
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