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refactor(compiler): use type guard rather than type cast (#33318) 

The code will now fail if the `i18n` property is of the wrong type.

PR Close #33318
This commit is contained in:
Pete Bacon Darwin 2019-10-22 15:05:44 +01:00 committed by Matias Niemelä
parent 03103d2d59
commit 58b3a51e64
1 changed files with 11 additions and 7 deletions
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18
packages/compiler/src/render3/r3_template_transform.ts
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@ -231,19 +231,23 @@ class HtmlAstToIvyAst implements html.Visitor {
}
visitExpansion(expansion: html.Expansion): t.Icu|null {
const meta = expansion.i18n as i18n.Message;
// do not generate Icu in case it was created
// outside of i18n block in a template
if (!meta) {
if (!expansion.i18n) {
// do not generate Icu in case it was created
// outside of i18n block in a template
return null;
}
if (!isI18nRootNode(expansion.i18n)) {
throw new Error(
`Invalid type "${expansion.i18n.constructor}" for "i18n" property of ${expansion.sourceSpan.toString()}. Expected a "Message"`);
}
const message = expansion.i18n;
const vars: {[name: string]: t.BoundText} = {};
const placeholders: {[name: string]: t.Text | t.BoundText} = {};
// extract VARs from ICUs - we process them separately while
// assembling resulting message via goog.getMsg function, since
// we need to pass them to top-level goog.getMsg call
Object.keys(meta.placeholders).forEach(key => {
const value = meta.placeholders[key];
Object.keys(message.placeholders).forEach(key => {
const value = message.placeholders[key];
if (key.startsWith(I18N_ICU_VAR_PREFIX)) {
const config = this.bindingParser.interpolationConfig;
// ICU expression is a plain string, not wrapped into start
@ -254,7 +258,7 @@ class HtmlAstToIvyAst implements html.Visitor {
placeholders[key] = this._visitTextWithInterpolation(value, expansion.sourceSpan);
}
});
return new t.Icu(vars, placeholders, expansion.sourceSpan, meta);
return new t.Icu(vars, placeholders, expansion.sourceSpan, message);
}
visitExpansionCase(expansionCase: html.ExpansionCase): null { return null; }