mirror of
https://github.com/angular/angular
synced 2026-05-24 09:28:37 +00:00
75 lines
2.5 KiB
TypeScript
75 lines
2.5 KiB
TypeScript
/**
|
|
* @license
|
|
* Copyright Google Inc. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by an MIT-style license that can be
|
|
* found in the LICENSE file at https://angular.io/license
|
|
*/
|
|
|
|
import * as i18n from './i18n_ast';
|
|
|
|
export function digestMessage(message: i18n.Message): string {
|
|
return strHash(serializeNodes(message.nodes).join('') + `[${message.meaning}]`);
|
|
}
|
|
|
|
/**
|
|
* String hash function similar to java.lang.String.hashCode().
|
|
* The hash code for a string is computed as
|
|
* s[0] * 31 ^ (n - 1) + s[1] * 31 ^ (n - 2) + ... + s[n - 1],
|
|
* where s[i] is the ith character of the string and n is the length of
|
|
* the string. We mod the result to make it between 0 (inclusive) and 2^32 (exclusive).
|
|
*
|
|
* Based on goog.string.hashCode from the Google Closure library
|
|
* https://github.com/google/closure-library/
|
|
*
|
|
* @internal
|
|
*/
|
|
// TODO(vicb): better algo (less collisions) ?
|
|
export function strHash(str: string): string {
|
|
let result: number = 0;
|
|
for (var i = 0; i < str.length; ++i) {
|
|
// Normalize to 4 byte range, 0 ... 2^32.
|
|
result = (31 * result + str.charCodeAt(i)) >>> 0;
|
|
}
|
|
return result.toString(16);
|
|
}
|
|
|
|
/**
|
|
* Serialize the i18n ast to something xml-like in order to generate an UID.
|
|
*
|
|
* The visitor is also used in the i18n parser tests
|
|
*
|
|
* @internal
|
|
*/
|
|
class _SerializerVisitor implements i18n.Visitor {
|
|
visitText(text: i18n.Text, context: any): any { return text.value; }
|
|
|
|
visitContainer(container: i18n.Container, context: any): any {
|
|
return `[${container.children.map(child => child.visit(this)).join(', ')}]`;
|
|
}
|
|
|
|
visitIcu(icu: i18n.Icu, context: any): any {
|
|
let strCases = Object.keys(icu.cases).map((k: string) => `${k} {${icu.cases[k].visit(this)}}`);
|
|
return `{${icu.expression}, ${icu.type}, ${strCases.join(', ')}}`;
|
|
}
|
|
|
|
visitTagPlaceholder(ph: i18n.TagPlaceholder, context: any): any {
|
|
return ph.isVoid ?
|
|
`<ph tag name="${ph.startName}"/>` :
|
|
`<ph tag name="${ph.startName}">${ph.children.map(child => child.visit(this)).join(', ')}</ph name="${ph.closeName}">`;
|
|
}
|
|
|
|
visitPlaceholder(ph: i18n.Placeholder, context: any): any {
|
|
return `<ph name="${ph.name}">${ph.value}</ph>`;
|
|
}
|
|
|
|
visitIcuPlaceholder(ph: i18n.IcuPlaceholder, context?: any): any {
|
|
return `<ph icu name="${ph.name}">${ph.value.visit(this)}</ph>`;
|
|
}
|
|
}
|
|
|
|
const serializerVisitor = new _SerializerVisitor();
|
|
|
|
export function serializeNodes(nodes: i18n.Node[]): string[] {
|
|
return nodes.map(a => a.visit(serializerVisitor, null));
|
|
}
|