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mindfulness/client/src/features/textWrap/measure/fontSpecKey.ts
2026-02-10 11:39:33 +08:00

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import type { FontSpec } from './types';
import { MissingFontSpecError, buildMissingFontSpecMessage } from './errors';
/**
* 校验 fontSpec 必填字段。
* 约束:缺失字段必须报错(简体中文),避免跨端漂移。
*/
export function assertFontSpecComplete(fontSpec: Partial<FontSpec> | undefined | null): asserts fontSpec is FontSpec {
if (!fontSpec) {
throw new MissingFontSpecError(buildMissingFontSpecMessage(['fontFamily', 'fontWeight', 'fontSize']));
}
const missing: string[] = [];
if (!fontSpec.fontFamily) missing.push('fontFamily');
if (!fontSpec.fontWeight) missing.push('fontWeight');
if (fontSpec.fontSize === undefined || fontSpec.fontSize === null) missing.push('fontSize');
if (missing.length) throw new MissingFontSpecError(buildMissingFontSpecMessage(missing));
if (!Number.isFinite(fontSpec.fontSize)) {
throw new MissingFontSpecError('fontSpec.fontSize 必须是有限数值number。请检查调用 wrapText() 时传入的 fontSize。');
}
}
/**
* 生成 fontSpecKey确定性
* 规则:`fontFamily|fontWeight|fontSize`(顺序固定)
*/
export function buildFontSpecKey(fontSpec: Partial<FontSpec> | undefined | null): string {
assertFontSpecComplete(fontSpec);
return `${fontSpec.fontFamily}|${fontSpec.fontWeight}|${String(fontSpec.fontSize)}`;
}