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420 lines
13 KiB
420 lines
13 KiB
import deindent from '../../utils/deindent';
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import { stringify, escape } from '../../utils/stringify';
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import CodeBuilder from '../../utils/CodeBuilder';
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import Component from '../Component';
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import Renderer from './Renderer';
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import { CompileOptions } from '../../interfaces';
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import { walk } from 'estree-walker';
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import stringifyProps from '../../utils/stringifyProps';
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import addToSet from '../../utils/addToSet';
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import getObject from '../../utils/getObject';
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import { extractNames } from '../../utils/annotateWithScopes';
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import { nodes_match } from '../../utils/nodes_match';
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import sanitize from '../../utils/sanitize';
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export default function dom(
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component: Component,
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options: CompileOptions
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) {
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const { name, code } = component;
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const renderer = new Renderer(component, options);
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const { block } = renderer;
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block.hasOutroMethod = true;
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// prevent fragment being created twice (#1063)
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if (options.customElement) block.builders.create.addLine(`this.c = @noop;`);
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const builder = new CodeBuilder();
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if (component.compileOptions.dev) {
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builder.addLine(`const ${renderer.fileVar} = ${JSON.stringify(component.file)};`);
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}
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const css = component.stylesheet.render(options.filename, !options.customElement);
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const styles = component.stylesheet.hasStyles && stringify(options.dev ?
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`${css.code}\n/*# sourceMappingURL=${css.map.toUrl()} */` :
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css.code, { onlyEscapeAtSymbol: true });
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if (styles && component.compileOptions.css !== false && !options.customElement) {
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builder.addBlock(deindent`
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function @add_css() {
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var style = @createElement("style");
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style.id = '${component.stylesheet.id}-style';
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style.textContent = ${styles};
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@append(document.head, style);
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}
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`);
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}
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// fix order
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// TODO the deconflicted names of blocks are reversed... should set them here
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const blocks = renderer.blocks.slice().reverse();
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blocks.forEach(block => {
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builder.addBlock(block.toString());
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});
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if (options.dev && !options.hydratable) {
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block.builders.claim.addLine(
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'throw new Error("options.hydrate only works if the component was compiled with the `hydratable: true` option");'
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);
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}
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// TODO injecting CSS this way is kinda dirty. Maybe it should be an
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// explicit opt-in, or something?
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const should_add_css = (
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!options.customElement &&
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component.stylesheet.hasStyles &&
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options.css !== false
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);
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const props = component.vars.filter(variable => !variable.module && variable.export_name);
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const writable_props = props.filter(variable => variable.writable);
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const set = (component.componentOptions.props || writable_props.length > 0 || renderer.slots.size > 0)
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? deindent`
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$$props => {
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${component.componentOptions.props && deindent`
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if (!${component.componentOptions.props}) ${component.componentOptions.props} = {};
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@assign(${component.componentOptions.props}, $$props);
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$$invalidate('${component.componentOptions.props_object}', ${component.componentOptions.props_object});
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`}
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${writable_props.map(prop =>
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`if ('${prop.export_name}' in $$props) $$invalidate('${prop.name}', ${prop.name} = $$props.${prop.export_name});`)}
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${renderer.slots.size > 0 &&
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`if ('$$scope' in $$props) $$invalidate('$$scope', $$scope = $$props.$$scope);`}
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}
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`
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: null;
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const body = [];
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const not_equal = component.componentOptions.immutable ? `@not_equal` : `@safe_not_equal`;
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let dev_props_check;
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props.forEach(x => {
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const variable = component.var_lookup.get(x.name);
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if (variable.hoistable) {
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body.push(deindent`
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get ${x.export_name}() {
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return ${x.name};
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}
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`);
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} else {
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body.push(deindent`
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get ${x.export_name}() {
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return this.$$.ctx.${x.name};
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}
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`);
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}
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if (variable.writable && !renderer.readonly.has(x.export_name)) {
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body.push(deindent`
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set ${x.export_name}(${x.name}) {
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this.$set({ ${x.name} });
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@flush();
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}
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`);
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} else if (component.compileOptions.dev) {
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body.push(deindent`
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set ${x.export_name}(value) {
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throw new Error("<${component.tag}>: Cannot set read-only property '${x.export_name}'");
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}
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`);
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}
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});
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if (component.compileOptions.dev) {
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// TODO check no uunexpected props were passed, as well as
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// checking that expected ones were passed
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const expected = props.filter(prop => !prop.initialised);
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if (expected.length) {
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dev_props_check = deindent`
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const { ctx } = this.$$;
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const props = ${options.customElement ? `this.attributes` : `options.props || {}`};
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${expected.map(prop => deindent`
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if (ctx.${prop.name} === undefined && !('${prop.export_name}' in props)) {
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console.warn("<${component.tag}> was created without expected prop '${prop.export_name}'");
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}`)}
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`;
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}
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}
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// instrument assignments
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if (component.ast.instance) {
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let scope = component.instance_scope;
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let map = component.instance_scope_map;
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let pending_assignments = new Set();
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walk(component.ast.instance.content, {
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enter: (node, parent) => {
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if (map.has(node)) {
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scope = map.get(node);
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}
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},
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leave(node, parent) {
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if (map.has(node)) {
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scope = scope.parent;
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}
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if (node.type === 'AssignmentExpression') {
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const names = node.left.type === 'MemberExpression'
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? [getObject(node.left).name]
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: extractNames(node.left);
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if (node.operator === '=' && nodes_match(node.left, node.right)) {
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const dirty = names.filter(name => {
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return scope.findOwner(name) === component.instance_scope;
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});
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if (dirty.length) component.has_reactive_assignments = true;
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code.overwrite(node.start, node.end, dirty.map(n => `$$invalidate('${n}', ${n})`).join('; '));
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} else {
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names.forEach(name => {
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const owner = scope.findOwner(name);
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if (owner && owner !== component.instance_scope) return;
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const variable = component.var_lookup.get(name);
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if (variable && variable.hoistable || variable.global || variable.module) return;
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pending_assignments.add(name);
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component.has_reactive_assignments = true;
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});
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}
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}
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else if (node.type === 'UpdateExpression') {
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const { name } = getObject(node.argument);
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if (scope.findOwner(name) !== component.instance_scope) return;
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const variable = component.var_lookup.get(name);
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if (variable && variable.hoistable) return;
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pending_assignments.add(name);
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component.has_reactive_assignments = true;
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}
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if (pending_assignments.size > 0) {
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if (node.type === 'ArrowFunctionExpression') {
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const insert = Array.from(pending_assignments).map(name => `$$invalidate('${name}', ${name})`).join(';');
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pending_assignments = new Set();
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code.prependRight(node.body.start, `{ const $$result = `);
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code.appendLeft(node.body.end, `; ${insert}; return $$result; }`);
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pending_assignments = new Set();
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}
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else if (/Statement/.test(node.type)) {
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const insert = Array.from(pending_assignments).map(name => `$$invalidate('${name}', ${name})`).join('; ');
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if (/^(Break|Continue|Return)Statement/.test(node.type)) {
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if (node.argument) {
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code.overwrite(node.start, node.argument.start, `var $$result = `);
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code.appendLeft(node.argument.end, `; ${insert}; return $$result`);
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} else {
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code.prependRight(node.start, `${insert}; `);
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}
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} else if (parent && /(If|For(In|Of)?|While)Statement/.test(parent.type) && node.type !== 'BlockStatement') {
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code.prependRight(node.start, '{ ');
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code.appendLeft(node.end, `${code.original[node.end - 1] === ';' ? '' : ';'} ${insert}; }`);
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} else {
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code.appendLeft(node.end, `${code.original[node.end - 1] === ';' ? '' : ';'} ${insert};`);
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}
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pending_assignments = new Set();
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}
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}
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}
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});
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if (pending_assignments.size > 0) {
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throw new Error(`TODO this should not happen!`);
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}
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component.rewrite_props();
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}
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const args = ['$$self'];
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if (props.length > 0 || component.has_reactive_assignments || renderer.slots.size > 0) {
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args.push('$$props', '$$invalidate');
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}
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builder.addBlock(deindent`
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function create_fragment(ctx) {
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${block.getContents()}
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}
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${component.module_javascript}
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${component.fully_hoisted.length > 0 && component.fully_hoisted.join('\n\n')}
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`);
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const filtered_declarations = component.vars.filter(variable => {
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return (variable.referenced || variable.export_name) && !variable.hoistable;
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}).map(variable => variable.name);
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const filtered_props = props.filter(prop => {
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const variable = component.var_lookup.get(prop.name);
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if (variable.hoistable) return false;
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if (prop.name[0] === '$') return false;
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return true;
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});
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const reactive_stores = component.vars.filter(variable => variable.name[0] === '$');
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if (renderer.slots.size > 0) {
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const arr = Array.from(renderer.slots);
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filtered_declarations.push(...arr.map(name => `$$slot_${sanitize(name)}`), '$$scope');
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}
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if (renderer.bindingGroups.length > 0) {
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filtered_declarations.push(`$$binding_groups`);
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}
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const has_definition = (
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component.javascript ||
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filtered_props.length > 0 ||
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component.partly_hoisted.length > 0 ||
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filtered_declarations.length > 0 ||
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component.reactive_declarations.length > 0
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);
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const definition = has_definition
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? component.alias('instance')
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: 'null';
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const all_reactive_dependencies = new Set();
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component.reactive_declarations.forEach(d => {
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addToSet(all_reactive_dependencies, d.dependencies);
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});
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const user_code = component.javascript || (
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!component.ast.instance && !component.ast.module && filtered_props.length > 0
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? `let { ${filtered_props.map(x => x.name).join(', ')} } = $$props;`
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: null
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);
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const reactive_store_subscriptions = reactive_stores.length > 0 && reactive_stores
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.map(({ name }) => deindent`
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let ${name};
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${component.compileOptions.dev && `@validate_store(${name.slice(1)}, '${name.slice(1)}');`}
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$$self.$$.on_destroy.push(${name.slice(1)}.subscribe($$value => { ${name} = $$value; $$invalidate('${name}', ${name}); }));
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`)
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.join('\n\n');
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if (has_definition) {
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const reactive_declarations = component.reactive_declarations.map(d => {
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const condition = Array.from(d.dependencies)
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.filter(n => {
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const variable = component.var_lookup.get(n);
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return variable && variable.writable;
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})
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.map(n => `$$dirty.${n}`).join(' || ');
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const snippet = d.node.body.type === 'BlockStatement'
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? `[✂${d.node.body.start}-${d.node.end}✂]`
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: deindent`
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{
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[✂${d.node.body.start}-${d.node.end}✂]
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}`;
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return deindent`
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if (${condition}) ${snippet}`
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});
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const injected = Array.from(component.injected_reactive_declaration_vars).filter(name => {
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const variable = component.var_lookup.get(name);
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return variable.injected;
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});
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builder.addBlock(deindent`
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function ${definition}(${args.join(', ')}) {
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${user_code}
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${renderer.slots.size && `let { ${[...renderer.slots].map(name => `$$slot_${sanitize(name)}`).join(', ')}, $$scope } = $$props;`}
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${renderer.bindingGroups.length > 0 && `const $$binding_groups = [${renderer.bindingGroups.map(_ => `[]`).join(', ')}];`}
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${component.partly_hoisted.length > 0 && component.partly_hoisted.join('\n\n')}
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${reactive_store_subscriptions}
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${set && `$$self.$set = ${set};`}
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${reactive_declarations.length > 0 && deindent`
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${injected.length && `let ${injected.join(', ')};`}
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$$self.$$.update = ($$dirty = { ${Array.from(all_reactive_dependencies).map(n => `${n}: 1`).join(', ')} }) => {
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${reactive_declarations}
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};
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`}
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return ${stringifyProps(filtered_declarations)};
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}
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`);
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}
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if (options.customElement) {
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builder.addBlock(deindent`
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class ${name} extends @SvelteElement {
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constructor(options) {
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super();
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${css.code && `this.shadowRoot.innerHTML = \`<style>${escape(css.code, { onlyEscapeAtSymbol: true }).replace(/\\/g, '\\\\')}${options.dev ? `\n/*# sourceMappingURL=${css.map.toUrl()} */` : ''}</style>\`;`}
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@init(this, { target: this.shadowRoot }, ${definition}, create_fragment, ${not_equal});
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${dev_props_check}
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if (options) {
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if (options.target) {
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@insert(options.target, this, options.anchor);
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}
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${(props.length > 0 || component.componentOptions.props) && deindent`
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if (options.props) {
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this.$set(options.props);
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@flush();
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}`}
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}
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}
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static get observedAttributes() {
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return ${JSON.stringify(props.map(x => x.export_name))};
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}
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${body.length > 0 && body.join('\n\n')}
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}
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customElements.define("${component.tag}", ${name});
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`);
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} else {
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const superclass = options.dev ? 'SvelteComponentDev' : 'SvelteComponent';
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builder.addBlock(deindent`
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class ${name} extends @${superclass} {
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constructor(options) {
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super(${options.dev && `options`});
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${should_add_css && `if (!document.getElementById("${component.stylesheet.id}-style")) @add_css();`}
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@init(this, options, ${definition}, create_fragment, ${not_equal});
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${dev_props_check}
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}
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${body.length > 0 && body.join('\n\n')}
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}
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`);
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}
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return builder.toString();
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}
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