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Fragment.ts
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Fragment.ts
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import Wrapper from './shared/Wrapper';
import AwaitBlock from './AwaitBlock';
import Body from './Body';
import DebugTag from './DebugTag';
import EachBlock from './EachBlock';
import Element from './Element/index';
import Head from './Head';
import IfBlock from './IfBlock';
import KeyBlock from './KeyBlock';
import InlineComponent from './InlineComponent/index';
import MustacheTag from './MustacheTag';
import RawMustacheTag from './RawMustacheTag';
import Slot from './Slot';
import SlotTemplate from './SlotTemplate';
import Text from './Text';
import Title from './Title';
import Window from './Window';
import { INode } from '../../nodes/interfaces';
import Renderer from '../Renderer';
import Block from '../Block';
import { trim_start, trim_end } from '../../../utils/trim';
import { link } from '../../../utils/link';
import { Identifier } from 'estree';
import { start_newline } from '../../../utils/patterns';
const wrappers = {
AwaitBlock,
Body,
Comment: null,
DebugTag,
EachBlock,
Element,
Head,
IfBlock,
InlineComponent,
KeyBlock,
MustacheTag,
Options: null,
RawMustacheTag,
Slot,
SlotTemplate,
Text,
Title,
Window
};
function trimmable_at(child: INode, next_sibling: Wrapper): boolean {
// Whitespace is trimmable if one of the following is true:
// The child and its sibling share a common nearest each block (not at an each block boundary)
// The next sibling's previous node is an each block
return (next_sibling.node.find_nearest(/EachBlock/) === child.find_nearest(/EachBlock/)) || next_sibling.node.prev.type === 'EachBlock';
}
export default class FragmentWrapper {
nodes: Wrapper[];
constructor(
renderer: Renderer,
block: Block,
nodes: INode[],
parent: Wrapper,
strip_whitespace: boolean,
next_sibling: Wrapper
) {
this.nodes = [];
let last_child: Wrapper;
let window_wrapper;
let i = nodes.length;
while (i--) {
const child = nodes[i];
if (!child.type) {
throw new Error('missing type');
}
if (!(child.type in wrappers)) {
throw new Error(`TODO implement ${child.type}`);
}
// special case — this is an easy way to remove whitespace surrounding
// <svelte:window/>. lil hacky but it works
if (child.type === 'Window') {
window_wrapper = new Window(renderer, block, parent, child);
continue;
}
if (child.type === 'Text') {
let { data } = child;
// We want to remove trailing whitespace inside an element/component/block,
// *unless* there is no whitespace between this node and its next sibling
if (this.nodes.length === 0) {
const should_trim = (
next_sibling ? (next_sibling.node.type === 'Text' && /^\s/.test(next_sibling.node.data) && trimmable_at(child, next_sibling)) : !child.has_ancestor('EachBlock')
);
if (should_trim && !child.keep_space()) {
data = trim_end(data);
if (!data) continue;
}
}
// glue text nodes (which could e.g. be separated by comments) together
if (last_child && last_child.node.type === 'Text') {
(last_child as Text).data = data + (last_child as Text).data;
continue;
}
const wrapper = new Text(renderer, block, parent, child, data);
if (wrapper.skip) continue;
this.nodes.unshift(wrapper);
link(last_child, last_child = wrapper);
} else {
const Wrapper = wrappers[child.type];
if (!Wrapper) continue;
const wrapper = new Wrapper(renderer, block, parent, child, strip_whitespace, last_child || next_sibling);
this.nodes.unshift(wrapper);
link(last_child, last_child = wrapper);
}
}
if (strip_whitespace) {
const first = this.nodes[0] as Text;
if (first && first.node.type === 'Text') {
if (!first.node.keep_space()) {
first.data = trim_start(first.data);
} else if (first.node.should_strip_leading_newline()) {
first.data = first.data.replace(start_newline, '');
}
if (!first.data) {
first.var = null;
this.nodes.shift();
if (this.nodes[0]) {
this.nodes[0].prev = null;
}
}
}
}
if (window_wrapper) {
this.nodes.unshift(window_wrapper);
link(last_child, window_wrapper);
}
}
render(block: Block, parent_node: Identifier, parent_nodes: Identifier) {
for (let i = 0; i < this.nodes.length; i += 1) {
this.nodes[i].render(block, parent_node, parent_nodes);
}
}
}