purewhiter--mobilegym
wehub-resource-sync
36 行
884 B
TypeScript
36 行
884 B
TypeScript
/**
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* 表达式符号转换器 — 翻译自 CalculatorExpressionTokenizer.java
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*
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* ASCII (内部) ↔ 显示 (本地化) 符号映射
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*/
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const TOKEN_MAP: [string, string][] = [
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['/', '÷'],
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['*', '×'],
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['-', '\u2212'], // U+2212 MINUS SIGN
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['Infinity', '∞'],
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];
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/** 将显示字符串转换为 ASCII 内部表示 */
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export function normalize(expr: string): string {
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let result = expr;
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for (const [ascii, display] of TOKEN_MAP) {
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result = result.replaceAll(display, ascii);
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}
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return result;
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}
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/** 将 ASCII 内部表示转换为显示字符串 */
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export function localize(expr: string): string {
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let result = expr;
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for (const [ascii, display] of TOKEN_MAP) {
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result = result.replaceAll(ascii, display);
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}
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return result;
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}
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/** 判断字符是否为数字 */
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export function isDigit(ch: string): boolean {
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return ch >= '0' && ch <= '9';
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}
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