Enum InternalFunction

pub enum InternalFunction {
    Len,
    Contains,
    Flatten,
    Upper,
    Lower,
    Trim,
    StartsWith,
    EndsWith,
    Matches,
    Extract,
    FuzzyMatch,
    Split,
    Abs,
    Sum,
    Avg,
    Min,
    Max,
    Rand,
    Median,
    Mode,
    Floor,
    Ceil,
    Round,
    Trunc,
    IsNumeric,
    String,
    Number,
    Bool,
    Type,
    Keys,
    Values,
    Date,
}

内置函数枚举

定义了表达式系统中所有可用的内置函数

Variants

Len

长度函数：获取字符串长度或数组元素个数

Contains

包含函数：检查字符串包含子串或数组包含元素

Flatten

扁平化函数：将嵌套数组展平为一维数组

Upper

转大写：将字符串转换为大写

Lower

转小写：将字符串转换为小写

Trim

去空格：移除字符串两端的空白字符

StartsWith

开始匹配：检查字符串是否以指定前缀开始

EndsWith

结束匹配：检查字符串是否以指定后缀结束

Matches

正则匹配：检查字符串是否匹配正则表达式

Extract

提取匹配：使用正则表达式提取字符串中的匹配内容

FuzzyMatch

模糊匹配：计算两个字符串或字符串数组的相似度

Split

分割：使用分隔符将字符串分割为数组

Abs

绝对值：返回数字的绝对值

Sum

求和：计算数组中所有数字的和

Avg

平均值：计算数组中所有数字的平均值

Min

最小值：返回数组中的最小值

Max

最大值：返回数组中的最大值

Rand

随机数：生成0到指定数字之间的随机数

Median

中位数：计算数组的中位数

Mode

众数：计算数组的众数

Floor

向下取整：返回不大于给定数字的最大整数

Ceil

向上取整：返回不小于给定数字的最小整数

Round

四舍五入：对数字进行四舍五入

Trunc

截断：截断数字的小数部分

IsNumeric

数字检查：检查值是否为数字类型

String

字符串转换：将值转换为字符串

Number

数字转换：将值转换为数字

Bool

布尔转换：将值转换为布尔值

Type

类型获取：返回值的类型名称

Keys

键列表：获取对象的所有键

Values

值列表：获取对象的所有值

Date

日期函数：创建或解析日期（使用简写’d’）

Trait Implementations

impl Clone for InternalFunction

fn clone(&self) -> InternalFunction

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for InternalFunction

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for InternalFunction

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'_derivative_strum> From<&'_derivative_strum InternalFunction> for &'static str

fn from(x: &'_derivative_strum InternalFunction) -> &'static str

Converts to this type from the input type.

impl From<&InternalFunction> for Rc<dyn FunctionDefinition>

fn from(value: &InternalFunction) -> Self

将内置函数枚举转换为函数定义

为每个内置函数创建相应的函数定义，包括函数签名和实现

impl From<InternalFunction> for &'static str

fn from(x: InternalFunction) -> &'static str

Converts to this type from the input type.

impl FromStr for InternalFunction

type Err = ParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<InternalFunction, <Self as FromStr>::Err>

Parses a string s to return a value of this type.

impl Hash for InternalFunction

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IntoEnumIterator for InternalFunction

type Iterator = InternalFunctionIter

fn iter() -> InternalFunctionIter

impl PartialEq for InternalFunction

fn eq(&self, other: &InternalFunction) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl TryFrom<&str> for InternalFunction

type Error = ParseError

The type returned in the event of a conversion error.

fn try_from(s: &str) -> Result<InternalFunction, <Self as TryFrom<&str>>::Error>

Performs the conversion.

impl Copy for InternalFunction

impl Eq for InternalFunction

impl IsEnabled for InternalFunction

impl StructuralPartialEq for InternalFunction