class-validator
Version:
Decorator-based property validation for classes.
36 lines • 1.49 kB
JavaScript
/**
* Convert the constraint to a string to be shown in an error
*/
export function constraintToString(constraint) {
if (Array.isArray(constraint)) {
return constraint.join(', ');
}
return `${constraint}`;
}
export class ValidationUtils {
static replaceMessageSpecialTokens(message, validationArguments) {
let messageString;
if (message instanceof Function) {
messageString = message(validationArguments);
}
else if (typeof message === 'string') {
messageString = message;
}
if (messageString && Array.isArray(validationArguments.constraints)) {
validationArguments.constraints.forEach((constraint, index) => {
messageString = messageString.replace(new RegExp(`\\$constraint${index + 1}`, 'g'), constraintToString(constraint));
});
}
if (messageString &&
validationArguments.value !== undefined &&
validationArguments.value !== null &&
typeof validationArguments.value === 'string')
messageString = messageString.replace(/\$value/g, validationArguments.value);
if (messageString)
messageString = messageString.replace(/\$property/g, validationArguments.property);
if (messageString)
messageString = messageString.replace(/\$target/g, validationArguments.targetName);
return messageString;
}
}
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