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node.js
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Mon, Feb 10, 17:53

node.js
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'use strict'
let { isClean, my } = require('./symbols')
let CssSyntaxError = require('./css-syntax-error')
let Stringifier = require('./stringifier')
let stringify = require('./stringify')
function cloneNode(obj, parent) {
let cloned = new obj.constructor()
for (let i in obj) {
if (!Object.prototype.hasOwnProperty.call(obj, i)) {
/* c8 ignore next 2 */
continue
}
if (i === 'proxyCache') continue
let value = obj[i]
let type = typeof value
if (i === 'parent' && type === 'object') {
if (parent) cloned[i] = parent
} else if (i === 'source') {
cloned[i] = value
} else if (Array.isArray(value)) {
cloned[i] = value.map(j => cloneNode(j, cloned))
} else {
if (type === 'object' && value !== null) value = cloneNode(value)
cloned[i] = value
}
}
return cloned
}
class Node {
constructor(defaults = {}) {
this.raws = {}
this[isClean] = false
this[my] = true
for (let name in defaults) {
if (name === 'nodes') {
this.nodes = []
for (let node of defaults[name]) {
if (typeof node.clone === 'function') {
this.append(node.clone())
} else {
this.append(node)
}
}
} else {
this[name] = defaults[name]
}
}
}
error(message, opts = {}) {
if (this.source) {
let { start, end } = this.rangeBy(opts)
return this.source.input.error(
message,
{ line: start.line, column: start.column },
{ line: end.line, column: end.column },
opts
)
}
return new CssSyntaxError(message)
}
warn(result, text, opts) {
let data = { node: this }
for (let i in opts) data[i] = opts[i]
return result.warn(text, data)
}
remove() {
if (this.parent) {
this.parent.removeChild(this)
}
this.parent = undefined
return this
}
toString(stringifier = stringify) {
if (stringifier.stringify) stringifier = stringifier.stringify
let result = ''
stringifier(this, i => {
result += i
})
return result
}
assign(overrides = {}) {
for (let name in overrides) {
this[name] = overrides[name]
}
return this
}
clone(overrides = {}) {
let cloned = cloneNode(this)
for (let name in overrides) {
cloned[name] = overrides[name]
}
return cloned
}
cloneBefore(overrides = {}) {
let cloned = this.clone(overrides)
this.parent.insertBefore(this, cloned)
return cloned
}
cloneAfter(overrides = {}) {
let cloned = this.clone(overrides)
this.parent.insertAfter(this, cloned)
return cloned
}
replaceWith(...nodes) {
if (this.parent) {
let bookmark = this
let foundSelf = false
for (let node of nodes) {
if (node === this) {
foundSelf = true
} else if (foundSelf) {
this.parent.insertAfter(bookmark, node)
bookmark = node
} else {
this.parent.insertBefore(bookmark, node)
}
}
if (!foundSelf) {
this.remove()
}
}
return this
}
next() {
if (!this.parent) return undefined
let index = this.parent.index(this)
return this.parent.nodes[index + 1]
}
prev() {
if (!this.parent) return undefined
let index = this.parent.index(this)
return this.parent.nodes[index - 1]
}
before(add) {
this.parent.insertBefore(this, add)
return this
}
after(add) {
this.parent.insertAfter(this, add)
return this
}
root() {
let result = this
while (result.parent && result.parent.type !== 'document') {
result = result.parent
}
return result
}
raw(prop, defaultType) {
let str = new Stringifier()
return str.raw(this, prop, defaultType)
}
cleanRaws(keepBetween) {
delete this.raws.before
delete this.raws.after
if (!keepBetween) delete this.raws.between
}
toJSON(_, inputs) {
let fixed = {}
let emitInputs = inputs == null
inputs = inputs || new Map()
let inputsNextIndex = 0
for (let name in this) {
if (!Object.prototype.hasOwnProperty.call(this, name)) {
/* c8 ignore next 2 */
continue
}
if (name === 'parent' || name === 'proxyCache') continue
let value = this[name]
if (Array.isArray(value)) {
fixed[name] = value.map(i => {
if (typeof i === 'object' && i.toJSON) {
return i.toJSON(null, inputs)
} else {
return i
}
})
} else if (typeof value === 'object' && value.toJSON) {
fixed[name] = value.toJSON(null, inputs)
} else if (name === 'source') {
let inputId = inputs.get(value.input)
if (inputId == null) {
inputId = inputsNextIndex
inputs.set(value.input, inputsNextIndex)
inputsNextIndex++
}
fixed[name] = {
inputId,
start: value.start,
end: value.end
}
} else {
fixed[name] = value
}
}
if (emitInputs) {
fixed.inputs = [...inputs.keys()].map(input => input.toJSON())
}
return fixed
}
positionInside(index) {
let string = this.toString()
let column = this.source.start.column
let line = this.source.start.line
for (let i = 0; i < index; i++) {
if (string[i] === '\n') {
column = 1
line += 1
} else {
column += 1
}
}
return { line, column }
}
positionBy(opts) {
let pos = this.source.start
if (opts.index) {
pos = this.positionInside(opts.index)
} else if (opts.word) {
let index = this.toString().indexOf(opts.word)
if (index !== -1) pos = this.positionInside(index)
}
return pos
}
rangeBy(opts) {
let start = {
line: this.source.start.line,
column: this.source.start.column
}
let end = this.source.end
? {
line: this.source.end.line,
column: this.source.end.column + 1
}
: {
line: start.line,
column: start.column + 1
}
if (opts.word) {
let index = this.toString().indexOf(opts.word)
if (index !== -1) {
start = this.positionInside(index)
end = this.positionInside(index + opts.word.length)
}
} else {
if (opts.start) {
start = {
line: opts.start.line,
column: opts.start.column
}
} else if (opts.index) {
start = this.positionInside(opts.index)
}
if (opts.end) {
end = {
line: opts.end.line,
column: opts.end.column
}
} else if (opts.endIndex) {
end = this.positionInside(opts.endIndex)
} else if (opts.index) {
end = this.positionInside(opts.index + 1)
}
}
if (
end.line < start.line ||
(end.line === start.line && end.column <= start.column)
) {
end = { line: start.line, column: start.column + 1 }
}
return { start, end }
}
getProxyProcessor() {
return {
set(node, prop, value) {
if (node[prop] === value) return true
node[prop] = value
if (
prop === 'prop' ||
prop === 'value' ||
prop === 'name' ||
prop === 'params' ||
prop === 'important' ||
/* c8 ignore next */
prop === 'text'
) {
node.markDirty()
}
return true
},
get(node, prop) {
if (prop === 'proxyOf') {
return node
} else if (prop === 'root') {
return () => node.root().toProxy()
} else {
return node[prop]
}
}
}
}
toProxy() {
if (!this.proxyCache) {
this.proxyCache = new Proxy(this, this.getProxyProcessor())
}
return this.proxyCache
}
addToError(error) {
error.postcssNode = this
if (error.stack && this.source && /\n\s{4}at /.test(error.stack)) {
let s = this.source
error.stack = error.stack.replace(
/\n\s{4}at /,
`$&${s.input.from}:${s.start.line}:${s.start.column}$&`
)
}
return error
}
markDirty() {
if (this[isClean]) {
this[isClean] = false
let next = this
while ((next = next.parent)) {
next[isClean] = false
}
}
}
get proxyOf() {
return this
}
}
module.exports = Node
Node.default = Node

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