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fragment.js
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fragment.js
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'use strict'
const Cursor = require('./cursor')
const ops = require('./ops')
const util = require('./util')
const renderImage = require('./image/render')
const PDFImage = require('./image/pdf')
const JPEGImage = require('./image/jpeg')
const ALREADY_ENDED_ERROR = new Error('already ended')
module.exports = class Fragment {
constructor(doc, parent) {
this._init(doc, parent)
}
/// private API
_init(doc, parent) {
this._doc = doc
this._parent = parent
this._cursor = parent._cursor
this._ended = false
this._current = null
this._pending = parent._pending
}
async _pageBreak(level) {
if (this._parent) {
await this._parent._pageBreak(level + 1)
}
}
async _end() {
// abstract
}
_begin(ctx) {
if (this._ended) {
throw ALREADY_ENDED_ERROR
}
if (this._current) {
this._current.end()
}
this._current = ctx
}
_opts(opts) {
if (this.opts) {
// inherit font options
return Object.assign({
font: this.opts.font,
fontSize: this.opts.fontSize,
color: this.opts.color,
lineHeight: this.opts.lineHeight,
}, opts)
} else {
return opts
}
}
/// public API
end() {
if (this._ended) {
throw ALREADY_ENDED_ERROR
}
if (this._current) {
this._current.end()
this._current = null
}
this._ended = true
this._pending.push(() => this._end())
}
text(text, opts) {
if (text !== null && typeof text === 'object') {
opts = text
text = undefined
}
if (!opts || typeof opts !== 'object') {
opts = {}
}
const Text = require('./text')
const ctx = new Text(this._doc, this, this._opts(opts))
this._begin(ctx)
ctx._pending.push(() => ctx._start())
if (typeof text === 'string' && text.length > 0) {
ctx.add(text)
}
return ctx
}
cell(text, opts) {
if (text !== null && typeof text === 'object') {
opts = text
text = undefined
}
if (!opts || typeof opts !== 'object') {
opts = {}
}
const Cell = require('./cell')
const ctx = new Cell(this._doc, this, this._opts(opts))
this._begin(ctx)
ctx._pending.push(() => ctx._start())
this._pending.push(ctx._pending)
if (typeof text === 'string' && text.length > 0) {
ctx.text(text, opts)
}
return ctx
}
table(opts) {
if (!opts || typeof opts !== 'object') {
opts = {}
}
const Table = require('./table')
const ctx = new Table(this._doc, this, this._opts(opts))
this._begin(ctx)
return ctx
}
image(img, opts) {
if (!(img instanceof JPEGImage) && !(img instanceof PDFImage)) {
throw new TypeError('Expected an image object')
}
if (!opts || typeof opts !== 'object') {
opts = {}
}
this._begin(null)
this._pending.push(() => renderImage(img, this._doc, this, opts))
}
pageBreak() {
this._begin(null)
this._pending.push(() => this._parent._pageBreak(1))
}
op(fn) {
this._begin(null)
this._pending.push(async () => {
if (!this._doc._currentContent) {
await this._doc._startPage()
}
let args = arguments
if (typeof fn === 'function') {
args = fn(this._cursor.x, this._cursor.y)
if (!Array.isArray(args)) {
throw new TypeError('Return of .op(() => {}) must be an array')
}
}
return this._doc._write(ops.write.apply(ops, args))
})
}
destination(name) {
this._begin(null)
this._pending.push(async () => {
const DestinationRangeStyle = require('./text').DestinationRangeStyle
const self = {
destination: name,
doc: this._doc,
from: this._cursor.x,
y: this._cursor.y,
}
DestinationRangeStyle.prototype._applyStyle.call(self)
})
}
}