本文整理汇总了TypeScript中spel2js.SpelExpressionEvaluator类的典型用法代码示例。如果您正苦于以下问题：TypeScript SpelExpressionEvaluator类的具体用法？TypeScript SpelExpressionEvaluator怎么用？TypeScript SpelExpressionEvaluator使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了SpelExpressionEvaluator类的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: parseExpressions
/**
* Helper that parses given expression string using the configured parser. The
* expression string can contain any number of expressions all contained in "${...}"
* markers. For instance: "foo${expr0}bar${expr1}". The static pieces of text will
* also be returned as Expressions that just return that static piece of text. As a
* result, evaluating all returned expressions and concatenating the results produces
* the complete evaluated string. Unwrapping is only done of the outermost delimiters
* found, so the string 'hello ${foo${abc}}' would break into the pieces 'hello ' and
* 'foo${abc}'. This means that expression languages that used ${..} as part of their
* functionality are supported without any problem. The parsing is aware of the
* structure of an embedded expression. It assumes that parentheses '(', square
* brackets '[' and curly brackets '}' must be in pairs within the expression unless
* they are within a string literal and a string literal starts and terminates with a
* single quote '.
* @param expressionString the expression string
* @return the parsed expressions
* @throws ParseException when the expressions cannot be parsed
*/
public parseExpressions(expressionString: string): spel2js.SpelExpression[] {
const expressions: spel2js.SpelExpression[] = [];
const prefix = '${';
const suffix = '}';
let startIdx = 0;
while (startIdx < expressionString.length) {
const prefixIndex = expressionString.indexOf(prefix, startIdx);
if (prefixIndex >= startIdx) {
// an inner expression was found - this is a composite
if (prefixIndex > startIdx) {
expressions.push(literalExpression(expressionString.substring(startIdx, prefixIndex)));
}
const afterPrefixIndex = prefixIndex + prefix.length;
const suffixIndex = this.skipToCorrectEndSuffix(suffix, expressionString, afterPrefixIndex);
if (suffixIndex === -1) {
throw new Error(
"No ending suffix '" +
suffix +
"' for expression starting at character " +
prefixIndex +
': ' +
expressionString.substring(prefixIndex),
);
}
if (suffixIndex === afterPrefixIndex) {
throw new Error(
"No expression defined within delimiter '" + prefix + suffix + "' at character " + prefixIndex,
);
}
const expr = expressionString.substring(prefixIndex + prefix.length, suffixIndex).trim();
if (!expr) {
throw new Error(
"No expression defined within delimiter '" + prefix + suffix + "' at character " + prefixIndex,
);
}
expressions.push(spel2js.SpelExpressionEvaluator.compile(expr));
startIdx = suffixIndex + suffix.length;
} else {
// no more ${expressions} found in string, add rest as static text
expressions.push(literalExpression(expressionString.substring(startIdx)));
startIdx = expressionString.length;
}
}
return expressions;
}示例2:
const literalExpression = (literalString: string) =>
spel2js.SpelExpressionEvaluator.compile(`'${literalString.replace(/'/g, "''")}'`);