e6c19077b6
* Removed expect_... methods and replaced them with .as_...() methods. This removes the need to import the free-standing methods every time and makes the code cleaner. * Changed all the examples appropriately. Implements #53
107 lines
3.8 KiB
Rust
107 lines
3.8 KiB
Rust
#[cfg(feature = "regex_support")]
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use regex::Regex;
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use crate::error::*;
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use value::{FloatType, IntType};
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use EvalexprError;
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use Function;
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use Value;
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pub fn builtin_function(identifier: &str) -> Option<Function> {
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match identifier {
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"min" => Some(Function::new(Box::new(|argument| {
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let arguments = argument.as_tuple()?;
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let mut min_int = IntType::max_value();
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let mut min_float = 1.0f64 / 0.0f64;
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debug_assert!(min_float.is_infinite());
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for argument in arguments {
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if let Value::Float(float) = argument {
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min_float = min_float.min(float);
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} else if let Value::Int(int) = argument {
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min_int = min_int.min(int);
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} else {
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return Err(EvalexprError::expected_number(argument.clone()));
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}
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}
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if (min_int as FloatType) < min_float {
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Ok(Value::Int(min_int))
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} else {
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Ok(Value::Float(min_float))
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}
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}))),
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"max" => Some(Function::new(Box::new(|argument| {
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let arguments = argument.as_tuple()?;
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let mut max_int = IntType::min_value();
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let mut max_float = -1.0f64 / 0.0f64;
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debug_assert!(max_float.is_infinite());
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for argument in arguments {
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if let Value::Float(float) = argument {
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max_float = max_float.max(float);
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} else if let Value::Int(int) = argument {
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max_int = max_int.max(int);
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} else {
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return Err(EvalexprError::expected_number(argument.clone()));
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}
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}
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if (max_int as FloatType) > max_float {
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Ok(Value::Int(max_int))
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} else {
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Ok(Value::Float(max_float))
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}
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}))),
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"len" => Some(Function::new(Box::new(|argument| {
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let subject = argument.as_string()?;
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Ok(Value::from(subject.len() as i64))
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}))),
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// string functions
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#[cfg(feature = "regex_support")]
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"str::regex_matches" => Some(Function::new(Box::new(|argument| {
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let arguments = argument.as_tuple()?;
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let subject = arguments[0].as_string()?;
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let re_str = arguments[1].as_string()?;
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match Regex::new(&re_str) {
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Ok(re) => Ok(Value::Boolean(re.is_match(&subject))),
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Err(err) => Err(EvalexprError::invalid_regex(
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re_str.to_string(),
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format!("{}", err),
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)),
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}
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}))),
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#[cfg(feature = "regex_support")]
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"str::regex_replace" => Some(Function::new(Box::new(|argument| {
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let arguments = argument.as_tuple()?;
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let subject = arguments[0].as_string()?;
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let re_str = arguments[1].as_string()?;
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let repl = arguments[2].as_string()?;
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match Regex::new(&re_str) {
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Ok(re) => Ok(Value::String(re.replace_all(&subject, repl.as_str()).to_string())),
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Err(err) => Err(EvalexprError::invalid_regex(
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re_str.to_string(),
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format!("{}", err),
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)),
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}
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}))),
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"str::to_lowercase" => Some(Function::new(Box::new(|argument| {
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let subject = argument.as_string()?;
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Ok(Value::from(subject.to_lowercase()))
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}))),
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"str::to_uppercase" => Some(Function::new(Box::new(|argument| {
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let subject = argument.as_string()?;
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Ok(Value::from(subject.to_uppercase()))
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}))),
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"str::trim" => Some(Function::new(Box::new(|argument| {
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let subject = argument.as_string()?;
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Ok(Value::from(subject.trim()))
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}))),
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_ => None,
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}
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}
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