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svelte/src/Stats.ts

118 lines
2.6 KiB

import { Node, Warning } from './interfaces';
import Component from './compile/Component';
const now = (typeof process !== 'undefined' && process.hrtime)
? () => {
const t = process.hrtime();
return t[0] * 1e3 + t[1] / 1e6;
}
: () => self.performance.now();
type Timing = {
label: string;
start: number;
end: number;
children: Timing[];
}
function collapseTimings(timings) {
const result = {};
timings.forEach(timing => {
result[timing.label] = Object.assign({
total: timing.end - timing.start
}, timing.children && collapseTimings(timing.children));
});
return result;
}
export default class Stats {
onwarn: (warning: Warning) => void;
startTime: number;
currentTiming: Timing;
currentChildren: Timing[];
timings: Timing[];
stack: Timing[];
warnings: Warning[];
constructor({ onwarn }: {
onwarn: (warning: Warning) => void
}) {
this.startTime = now();
this.stack = [];
this.currentChildren = this.timings = [];
this.onwarn = onwarn;
this.warnings = [];
}
start(label) {
const timing = {
label,
start: now(),
end: null,
children: []
};
this.currentChildren.push(timing);
this.stack.push(timing);
this.currentTiming = timing;
this.currentChildren = timing.children;
}
stop(label) {
if (label !== this.currentTiming.label) {
throw new Error(`Mismatched timing labels (expected ${this.currentTiming.label}, got ${label})`);
}
this.currentTiming.end = now();
this.stack.pop();
this.currentTiming = this.stack[this.stack.length - 1];
this.currentChildren = this.currentTiming ? this.currentTiming.children : this.timings;
}
render(component: Component) {
const timings = Object.assign({
total: now() - this.startTime
}, collapseTimings(this.timings));
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// TODO would be good to have this info even
// if options.generate is false
const imports = component && component.imports.map(node => {
return {
source: node.source.value,
specifiers: node.specifiers.map(specifier => {
return {
name: (
specifier.type === 'ImportDefaultSpecifier' ? 'default' :
specifier.type === 'ImportNamespaceSpecifier' ? '*' :
specifier.imported.name
),
as: specifier.local.name
};
})
}
});
const hooks: Record<string, boolean> = component && {
oncreate: !!component.templateProperties.oncreate,
ondestroy: !!component.templateProperties.ondestroy,
onstate: !!component.templateProperties.onstate,
onupdate: !!component.templateProperties.onupdate
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};
return {
timings,
warnings: this.warnings,
imports,
hooks
};
}
warn(warning) {
this.warnings.push(warning);
this.onwarn(warning);
}
}