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1332 lines
55 KiB
1332 lines
55 KiB
//! This module implements the global `String` object. |
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//! |
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//! The `String` global object is a constructor for strings or a sequence of characters. |
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//! |
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//! More information: |
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//! - [ECMAScript reference][spec] |
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//! - [MDN documentation][mdn] |
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//! |
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//! [spec]: https://tc39.es/ecma262/#sec-string-object |
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//! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String |
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|
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pub mod string_iterator; |
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#[cfg(test)] |
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mod tests; |
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|
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use crate::builtins::Symbol; |
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use crate::object::PROTOTYPE; |
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use crate::property::DataDescriptor; |
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use crate::{ |
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builtins::{string::string_iterator::StringIterator, Array, BuiltIn, RegExp}, |
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object::{ConstructorBuilder, Object, ObjectData}, |
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property::Attribute, |
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value::{RcString, Value}, |
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BoaProfiler, Context, Result, |
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}; |
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use regress::Regex; |
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use std::{ |
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char::{decode_utf16, from_u32}, |
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cmp::{max, min}, |
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f64::NAN, |
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string::String as StdString, |
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}; |
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pub(crate) fn code_point_at(string: RcString, position: i32) -> Option<(u32, u8, bool)> { |
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let size = string.encode_utf16().count() as i32; |
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if position < 0 || position >= size { |
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return None; |
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} |
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let mut encoded = string.encode_utf16(); |
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let first = encoded.nth(position as usize)?; |
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if !is_leading_surrogate(first) && !is_trailing_surrogate(first) { |
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return Some((first as u32, 1, false)); |
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} |
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if is_trailing_surrogate(first) || position + 1 == size { |
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return Some((first as u32, 1, true)); |
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} |
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let second = encoded.next()?; |
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if !is_trailing_surrogate(second) { |
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return Some((first as u32, 1, true)); |
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} |
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let cp = (first as u32 - 0xD800) * 0x400 + (second as u32 - 0xDC00) + 0x10000; |
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Some((cp, 2, false)) |
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} |
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fn is_leading_surrogate(value: u16) -> bool { |
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(0xD800..=0xDBFF).contains(&value) |
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} |
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|
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fn is_trailing_surrogate(value: u16) -> bool { |
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(0xDC00..=0xDFFF).contains(&value) |
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} |
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/// JavaScript `String` implementation. |
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#[derive(Debug, Clone, Copy)] |
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pub(crate) struct String; |
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impl BuiltIn for String { |
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const NAME: &'static str = "String"; |
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fn attribute() -> Attribute { |
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Attribute::WRITABLE | Attribute::NON_ENUMERABLE | Attribute::CONFIGURABLE |
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} |
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fn init(context: &mut Context) -> (&'static str, Value, Attribute) { |
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let _timer = BoaProfiler::global().start_event(Self::NAME, "init"); |
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let symbol_iterator = context.well_known_symbols().iterator_symbol(); |
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let attribute = Attribute::READONLY | Attribute::NON_ENUMERABLE | Attribute::PERMANENT; |
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let string_object = ConstructorBuilder::with_standard_object( |
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context, |
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Self::constructor, |
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context.standard_objects().string_object().clone(), |
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) |
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.name(Self::NAME) |
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.length(Self::LENGTH) |
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.property("length", 0, attribute) |
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.method(Self::char_at, "charAt", 1) |
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.method(Self::char_code_at, "charCodeAt", 1) |
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.method(Self::code_point_at, "codePointAt", 1) |
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.method(Self::to_string, "toString", 0) |
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.method(Self::concat, "concat", 1) |
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.method(Self::repeat, "repeat", 1) |
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.method(Self::slice, "slice", 2) |
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.method(Self::starts_with, "startsWith", 1) |
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.method(Self::ends_with, "endsWith", 1) |
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.method(Self::includes, "includes", 1) |
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.method(Self::index_of, "indexOf", 1) |
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.method(Self::last_index_of, "lastIndexOf", 1) |
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.method(Self::r#match, "match", 1) |
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.method(Self::pad_end, "padEnd", 1) |
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.method(Self::pad_start, "padStart", 1) |
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.method(Self::trim, "trim", 0) |
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.method(Self::trim_start, "trimStart", 0) |
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.method(Self::trim_end, "trimEnd", 0) |
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.method(Self::to_lowercase, "toLowerCase", 0) |
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.method(Self::to_uppercase, "toUpperCase", 0) |
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.method(Self::substring, "substring", 2) |
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.method(Self::substr, "substr", 2) |
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.method(Self::split, "split", 2) |
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.method(Self::value_of, "valueOf", 0) |
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.method(Self::match_all, "matchAll", 1) |
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.method(Self::replace, "replace", 2) |
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.method(Self::iterator, (symbol_iterator, "[Symbol.iterator]"), 0) |
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.build(); |
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|
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(Self::NAME, string_object.into(), Self::attribute()) |
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} |
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} |
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impl String { |
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/// The amount of arguments this function object takes. |
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pub(crate) const LENGTH: usize = 1; |
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|
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/// JavaScript strings must be between `0` and less than positive `Infinity` and cannot be a negative number. |
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/// The range of allowed values can be described like this: `[0, +∞)`. |
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/// |
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/// The resulting string can also not be larger than the maximum string size, |
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/// which can differ in JavaScript engines. In Boa it is `2^32 - 1` |
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pub(crate) const MAX_STRING_LENGTH: f64 = u32::MAX as f64; |
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/// `String( value )` |
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/// |
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/// <https://tc39.es/ecma262/#sec-string-constructor-string-value> |
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pub(crate) fn constructor( |
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new_target: &Value, |
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args: &[Value], |
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context: &mut Context, |
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) -> Result<Value> { |
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// This value is used by console.log and other routines to match Object type |
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// to its Javascript Identifier (global constructor method name) |
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let string = match args.get(0) { |
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Some(value) if value.is_symbol() && new_target.is_undefined() => { |
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Symbol::to_string(value, &[], context)? |
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.as_string() |
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.expect("'Symbol::to_string' returns 'Value::String'") |
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.clone() |
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} |
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Some(ref value) => value.to_string(context)?, |
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None => RcString::default(), |
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}; |
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|
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if new_target.is_undefined() { |
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return Ok(string.into()); |
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} |
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let prototype = new_target |
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.as_object() |
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.and_then(|obj| { |
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obj.get(&PROTOTYPE.into(), obj.clone().into(), context) |
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.map(|o| o.as_object()) |
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.transpose() |
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}) |
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.transpose()? |
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.unwrap_or_else(|| context.standard_objects().object_object().prototype()); |
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let this = Value::new_object(context); |
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this.as_object() |
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.expect("this should be an object") |
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.set_prototype_instance(prototype.into()); |
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let length = DataDescriptor::new( |
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Value::from(string.encode_utf16().count()), |
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Attribute::NON_ENUMERABLE, |
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); |
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this.set_property("length", length); |
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this.set_data(ObjectData::String(string)); |
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Ok(this) |
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} |
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fn this_string_value(this: &Value, context: &mut Context) -> Result<RcString> { |
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match this { |
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Value::String(ref string) => return Ok(string.clone()), |
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Value::Object(ref object) => { |
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let object = object.borrow(); |
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if let Some(string) = object.as_string() { |
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return Ok(string); |
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} |
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} |
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_ => {} |
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} |
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Err(context.construct_type_error("'this' is not a string")) |
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} |
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/// Get the string value to a primitive string |
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#[allow(clippy::wrong_self_convention)] |
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#[inline] |
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pub(crate) fn to_string(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> { |
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// Get String from String Object and send it back as a new value |
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Ok(Value::from(Self::this_string_value(this, context)?)) |
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} |
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/// `String.prototype.charAt( index )` |
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/// |
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/// The `String` object's `charAt()` method returns a new string consisting of the single UTF-16 code unit located at the specified offset into the string. |
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/// |
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/// Characters in a string are indexed from left to right. The index of the first character is `0`, |
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/// and the index of the last character—in a string called `stringName`—is `stringName.length - 1`. |
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/// If the `index` you supply is out of this range, JavaScript returns an empty string. |
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/// |
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/// If no index is provided to `charAt()`, the default is `0`. |
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/// |
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/// More information: |
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/// - [ECMAScript reference][spec] |
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/// - [MDN documentation][mdn] |
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/// |
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/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.charat |
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/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charAt |
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pub(crate) fn char_at(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
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// First we get it the actual string a private field stored on the object only the context has access to. |
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// Then we convert it into a Rust String by wrapping it in from_value |
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let primitive_val = this.to_string(context)?; |
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let pos = args |
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.get(0) |
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.cloned() |
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.unwrap_or_else(Value::undefined) |
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.to_integer(context)? as i32; |
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|
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// Fast path returning empty string when pos is obviously out of range |
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if pos < 0 || pos >= primitive_val.len() as i32 { |
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return Ok("".into()); |
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} |
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|
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// Calling .len() on a string would give the wrong result, as they are bytes not the number of |
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// unicode code points |
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// Note that this is an O(N) operation (because UTF-8 is complex) while getting the number of |
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// bytes is an O(1) operation. |
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if let Some(utf16_val) = primitive_val.encode_utf16().nth(pos as usize) { |
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Ok(Value::from(from_u32(utf16_val as u32).unwrap())) |
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} else { |
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Ok("".into()) |
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} |
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} |
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/// `String.prototype.codePointAt( index )` |
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/// |
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/// The `codePointAt()` method returns an integer between `0` to `1114111` (`0x10FFFF`) representing the UTF-16 code unit at the given index. |
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/// |
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/// If no UTF-16 surrogate pair begins at the index, the code point at the index is returned. |
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/// |
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/// `codePointAt()` returns `undefined` if the given index is less than `0`, or if it is equal to or greater than the `length` of the string. |
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/// |
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/// More information: |
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/// - [ECMAScript reference][spec] |
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/// - [MDN documentation][mdn] |
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/// |
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/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.codepointat |
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/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/codePointAt |
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pub(crate) fn code_point_at( |
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this: &Value, |
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args: &[Value], |
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context: &mut Context, |
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) -> Result<Value> { |
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// First we get it the actual string a private field stored on the object only the context has access to. |
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// Then we convert it into a Rust String by wrapping it in from_value |
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let primitive_val = this.to_string(context)?; |
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let pos = args |
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.get(0) |
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.cloned() |
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.unwrap_or_else(Value::undefined) |
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.to_integer(context)? as i32; |
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|
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// Fast path returning undefined when pos is obviously out of range |
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if pos < 0 || pos >= primitive_val.len() as i32 { |
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return Ok(Value::undefined()); |
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} |
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|
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if let Some((code_point, _, _)) = code_point_at(primitive_val, pos) { |
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Ok(Value::from(code_point)) |
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} else { |
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Ok(Value::undefined()) |
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} |
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} |
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|
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/// `String.prototype.charCodeAt( index )` |
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/// |
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/// The `charCodeAt()` method returns an integer between `0` and `65535` representing the UTF-16 code unit at the given index. |
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/// |
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/// Unicode code points range from `0` to `1114111` (`0x10FFFF`). The first 128 Unicode code points are a direct match of the ASCII character encoding. |
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/// |
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/// `charCodeAt()` returns `NaN` if the given index is less than `0`, or if it is equal to or greater than the `length` of the string. |
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/// |
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/// More information: |
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/// - [ECMAScript reference][spec] |
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/// - [MDN documentation][mdn] |
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/// |
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/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.charcodeat |
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/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charCodeAt |
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pub(crate) fn char_code_at( |
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this: &Value, |
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args: &[Value], |
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context: &mut Context, |
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) -> Result<Value> { |
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// First we get it the actual string a private field stored on the object only the context has access to. |
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// Then we convert it into a Rust String by wrapping it in from_value |
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let primitive_val = this.to_string(context)?; |
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let pos = args |
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.get(0) |
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.cloned() |
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.unwrap_or_else(Value::undefined) |
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.to_integer(context)? as i32; |
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|
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// Fast path returning NaN when pos is obviously out of range |
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if pos < 0 || pos >= primitive_val.len() as i32 { |
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return Ok(Value::from(NAN)); |
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} |
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|
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// Calling .len() on a string would give the wrong result, as they are bytes not the number of unicode code points |
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// Note that this is an O(N) operation (because UTF-8 is complex) while getting the number of bytes is an O(1) operation. |
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// If there is no element at that index, the result is NaN |
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if let Some(utf16_val) = primitive_val.encode_utf16().nth(pos as usize) { |
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Ok(Value::from(f64::from(utf16_val))) |
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} else { |
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Ok(Value::from(NAN)) |
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} |
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} |
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|
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/// `String.prototype.concat( str1[, ...strN] )` |
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/// |
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/// The `concat()` method concatenates the string arguments to the calling string and returns a new string. |
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/// |
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/// Changes to the original string or the returned string don't affect the other. |
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/// |
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/// If the arguments are not of the type string, they are converted to string values before concatenating. |
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/// |
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/// More information: |
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/// - [ECMAScript reference][spec] |
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/// - [MDN documentation][mdn] |
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/// |
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/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.concat |
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/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/concat |
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pub(crate) fn concat(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
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let object = this.require_object_coercible(context)?; |
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let mut string = object.to_string(context)?.to_string(); |
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|
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for arg in args { |
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string.push_str(&arg.to_string(context)?); |
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} |
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|
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Ok(Value::from(string)) |
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} |
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|
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/// `String.prototype.repeat( count )` |
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/// |
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/// The `repeat()` method constructs and returns a new string which contains the specified number of |
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/// copies of the string on which it was called, concatenated together. |
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/// |
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/// More information: |
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/// - [ECMAScript reference][spec] |
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/// - [MDN documentation][mdn] |
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/// |
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/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.repeat |
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/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat |
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pub(crate) fn repeat(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
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let object = this.require_object_coercible(context)?; |
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let string = object.to_string(context)?; |
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|
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if let Some(arg) = args.get(0) { |
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let n = arg.to_integer(context)?; |
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if n < 0.0 { |
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return context.throw_range_error("repeat count cannot be a negative number"); |
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} |
|
|
|
if n.is_infinite() { |
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return context.throw_range_error("repeat count cannot be infinity"); |
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} |
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|
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if n * (string.len() as f64) > Self::MAX_STRING_LENGTH { |
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return context |
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.throw_range_error("repeat count must not overflow maximum string length"); |
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} |
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Ok(string.repeat(n as usize).into()) |
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} else { |
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Ok("".into()) |
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} |
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} |
|
|
|
/// `String.prototype.slice( beginIndex [, endIndex] )` |
|
/// |
|
/// The `slice()` method extracts a section of a string and returns it as a new string, without modifying the original string. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
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/// |
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/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.slice |
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/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice |
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pub(crate) fn slice(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
// First we get it the actual string a private field stored on the object only the context has access to. |
|
// Then we convert it into a Rust String by wrapping it in from_value |
|
let primitive_val = this.to_string(context)?; |
|
|
|
// Calling .len() on a string would give the wrong result, as they are bytes not the number of unicode code points |
|
// Note that this is an O(N) operation (because UTF-8 is complex) while getting the number of bytes is an O(1) operation. |
|
let length = primitive_val.chars().count() as i32; |
|
|
|
let start = args |
|
.get(0) |
|
.cloned() |
|
.unwrap_or_else(Value::undefined) |
|
.to_integer(context)? as i32; |
|
let end = args |
|
.get(1) |
|
.cloned() |
|
.unwrap_or_else(|| Value::integer(length)) |
|
.to_integer(context)? as i32; |
|
|
|
let from = if start < 0 { |
|
max(length.wrapping_add(start), 0) |
|
} else { |
|
min(start, length) |
|
}; |
|
let to = if end < 0 { |
|
max(length.wrapping_add(end), 0) |
|
} else { |
|
min(end, length) |
|
}; |
|
|
|
let span = max(to.wrapping_sub(from), 0); |
|
|
|
let new_str: StdString = primitive_val |
|
.chars() |
|
.skip(from as usize) |
|
.take(span as usize) |
|
.collect(); |
|
Ok(Value::from(new_str)) |
|
} |
|
|
|
/// `String.prototype.startWith( searchString[, position] )` |
|
/// |
|
/// The `startsWith()` method determines whether a string begins with the characters of a specified string, returning `true` or `false` as appropriate. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.startswith |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith |
|
pub(crate) fn starts_with( |
|
this: &Value, |
|
args: &[Value], |
|
context: &mut Context, |
|
) -> Result<Value> { |
|
// First we get it the actual string a private field stored on the object only the context has access to. |
|
// Then we convert it into a Rust String by wrapping it in from_value |
|
let primitive_val = this.to_string(context)?; |
|
|
|
let arg = args.get(0).cloned().unwrap_or_else(Value::undefined); |
|
|
|
if Self::is_regexp_object(&arg) { |
|
context.throw_type_error( |
|
"First argument to String.prototype.startsWith must not be a regular expression", |
|
)?; |
|
} |
|
|
|
let search_string = arg.to_string(context)?; |
|
|
|
let length = primitive_val.chars().count() as i32; |
|
let search_length = search_string.chars().count() as i32; |
|
|
|
// If less than 2 args specified, position is 'undefined', defaults to 0 |
|
let position = if args.len() < 2 { |
|
0 |
|
} else { |
|
args.get(1) |
|
.expect("failed to get arg") |
|
.to_integer(context)? as i32 |
|
}; |
|
|
|
let start = min(max(position, 0), length); |
|
let end = start.wrapping_add(search_length); |
|
|
|
if end > length { |
|
Ok(Value::from(false)) |
|
} else { |
|
// Only use the part of the string from "start" |
|
let this_string: StdString = primitive_val.chars().skip(start as usize).collect(); |
|
Ok(Value::from(this_string.starts_with(search_string.as_str()))) |
|
} |
|
} |
|
|
|
/// `String.prototype.endsWith( searchString[, length] )` |
|
/// |
|
/// The `endsWith()` method determines whether a string ends with the characters of a specified string, returning `true` or `false` as appropriate. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.endswith |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith |
|
pub(crate) fn ends_with(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
// First we get it the actual string a private field stored on the object only the context has access to. |
|
// Then we convert it into a Rust String by wrapping it in from_value |
|
let primitive_val = this.to_string(context)?; |
|
|
|
let arg = args.get(0).cloned().unwrap_or_else(Value::undefined); |
|
|
|
if Self::is_regexp_object(&arg) { |
|
context.throw_type_error( |
|
"First argument to String.prototype.endsWith must not be a regular expression", |
|
)?; |
|
} |
|
|
|
let search_string = arg.to_string(context)?; |
|
|
|
let length = primitive_val.chars().count() as i32; |
|
let search_length = search_string.chars().count() as i32; |
|
|
|
// If less than 2 args specified, end_position is 'undefined', defaults to |
|
// length of this |
|
let end_position = if args.len() < 2 { |
|
length |
|
} else { |
|
args.get(1) |
|
.expect("Could not get argumetn") |
|
.to_integer(context)? as i32 |
|
}; |
|
|
|
let end = min(max(end_position, 0), length); |
|
let start = end.wrapping_sub(search_length); |
|
|
|
if start < 0 { |
|
Ok(Value::from(false)) |
|
} else { |
|
// Only use the part of the string up to "end" |
|
let this_string: StdString = primitive_val.chars().take(end as usize).collect(); |
|
Ok(Value::from(this_string.ends_with(search_string.as_str()))) |
|
} |
|
} |
|
|
|
/// `String.prototype.includes( searchString[, position] )` |
|
/// |
|
/// The `includes()` method determines whether one string may be found within another string, returning `true` or `false` as appropriate. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.includes |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes |
|
pub(crate) fn includes(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
// First we get it the actual string a private field stored on the object only the context has access to. |
|
// Then we convert it into a Rust String by wrapping it in from_value |
|
let primitive_val = this.to_string(context)?; |
|
|
|
let arg = args.get(0).cloned().unwrap_or_else(Value::undefined); |
|
|
|
if Self::is_regexp_object(&arg) { |
|
context.throw_type_error( |
|
"First argument to String.prototype.includes must not be a regular expression", |
|
)?; |
|
} |
|
|
|
let search_string = arg.to_string(context)?; |
|
|
|
let length = primitive_val.chars().count() as i32; |
|
|
|
// If less than 2 args specified, position is 'undefined', defaults to 0 |
|
let position = if args.len() < 2 { |
|
0 |
|
} else { |
|
args.get(1) |
|
.expect("Could not get argument") |
|
.to_integer(context)? as i32 |
|
}; |
|
|
|
let start = min(max(position, 0), length); |
|
|
|
// Take the string from "this" and use only the part of it after "start" |
|
let this_string: StdString = primitive_val.chars().skip(start as usize).collect(); |
|
|
|
Ok(Value::from(this_string.contains(search_string.as_str()))) |
|
} |
|
|
|
/// Return either the string itself or the string of the regex equivalent |
|
fn get_regex_string(value: &Value) -> StdString { |
|
match value { |
|
Value::String(ref body) => body.to_string(), |
|
Value::Object(ref obj) => { |
|
let obj = obj.borrow(); |
|
|
|
if let Some(regexp) = obj.as_regexp() { |
|
// first argument is another `RegExp` object, so copy its pattern and flags |
|
return regexp.original_source.clone().into(); |
|
} |
|
"undefined".to_string() |
|
} |
|
_ => "undefined".to_string(), |
|
} |
|
} |
|
|
|
fn is_regexp_object(value: &Value) -> bool { |
|
match value { |
|
Value::Object(ref obj) => obj.borrow().is_regexp(), |
|
_ => false, |
|
} |
|
} |
|
|
|
/// `String.prototype.replace( regexp|substr, newSubstr|function )` |
|
/// |
|
/// The `replace()` method returns a new string with some or all matches of a `pattern` replaced by a `replacement`. |
|
/// |
|
/// The `pattern` can be a string or a `RegExp`, and the `replacement` can be a string or a function to be called for each match. |
|
/// If `pattern` is a string, only the first occurrence will be replaced. |
|
/// |
|
/// The original string is left unchanged. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.replace |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace |
|
pub(crate) fn replace(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
// TODO: Support Symbol replacer |
|
let primitive_val = this.to_string(context)?; |
|
if args.is_empty() { |
|
return Ok(Value::from(primitive_val)); |
|
} |
|
|
|
let regex_body = Self::get_regex_string(args.get(0).expect("Value needed")); |
|
let re = Regex::new(®ex_body).expect("unable to convert regex to regex object"); |
|
let mat = match re.find(&primitive_val) { |
|
Some(mat) => mat, |
|
None => return Ok(Value::from(primitive_val)), |
|
}; |
|
let caps = re |
|
.find(&primitive_val) |
|
.expect("unable to get capture groups from text") |
|
.captures; |
|
|
|
let replace_value = if args.len() > 1 { |
|
// replace_object could be a string or function or not exist at all |
|
let replace_object: &Value = args.get(1).expect("second argument expected"); |
|
match replace_object { |
|
Value::String(val) => { |
|
// https://tc39.es/ecma262/#table-45 |
|
let mut result = StdString::new(); |
|
let mut chars = val.chars().peekable(); |
|
|
|
let m = caps.len(); |
|
|
|
while let Some(first) = chars.next() { |
|
if first == '$' { |
|
let second = chars.next(); |
|
let second_is_digit = second.map_or(false, |ch| ch.is_digit(10)); |
|
// we use peek so that it is still in the iterator if not used |
|
let third = if second_is_digit { chars.peek() } else { None }; |
|
let third_is_digit = third.map_or(false, |ch| ch.is_digit(10)); |
|
|
|
match (second, third) { |
|
(Some('$'), _) => { |
|
// $$ |
|
result.push('$'); |
|
} |
|
(Some('&'), _) => { |
|
// $& |
|
result.push_str(&primitive_val[mat.range()]); |
|
} |
|
(Some('`'), _) => { |
|
// $` |
|
let start_of_match = mat.start(); |
|
result.push_str(&primitive_val[..start_of_match]); |
|
} |
|
(Some('\''), _) => { |
|
// $' |
|
let end_of_match = mat.end(); |
|
result.push_str(&primitive_val[end_of_match..]); |
|
} |
|
(Some(second), Some(third)) |
|
if second_is_digit && third_is_digit => |
|
{ |
|
// $nn |
|
let tens = second.to_digit(10).unwrap() as usize; |
|
let units = third.to_digit(10).unwrap() as usize; |
|
let nn = 10 * tens + units; |
|
if nn == 0 || nn > m { |
|
result.push(first); |
|
result.push(second); |
|
if let Some(ch) = chars.next() { |
|
result.push(ch); |
|
} |
|
} else { |
|
let group = match mat.group(nn) { |
|
Some(range) => &primitive_val[range.clone()], |
|
_ => "", |
|
}; |
|
result.push_str(group); |
|
chars.next(); // consume third |
|
} |
|
} |
|
(Some(second), _) if second_is_digit => { |
|
// $n |
|
let n = second.to_digit(10).unwrap() as usize; |
|
if n == 0 || n > m { |
|
result.push(first); |
|
result.push(second); |
|
} else { |
|
let group = match mat.group(n) { |
|
Some(range) => &primitive_val[range.clone()], |
|
_ => "", |
|
}; |
|
result.push_str(group); |
|
} |
|
} |
|
(Some('<'), _) => { |
|
// $< |
|
// TODO: named capture groups |
|
result.push_str("$<"); |
|
} |
|
_ => { |
|
// $?, ? is none of the above |
|
// we can consume second because it isn't $ |
|
result.push(first); |
|
if let Some(second) = second { |
|
result.push(second); |
|
} |
|
} |
|
} |
|
} else { |
|
result.push(first); |
|
} |
|
} |
|
|
|
result |
|
} |
|
Value::Object(_) => { |
|
// This will return the matched substring first, then captured parenthesized groups later |
|
let mut results: Vec<Value> = mat |
|
.groups() |
|
.map(|group| match group { |
|
Some(range) => Value::from(&primitive_val[range]), |
|
None => Value::undefined(), |
|
}) |
|
.collect(); |
|
|
|
// Returns the starting byte offset of the match |
|
let start = mat.start(); |
|
results.push(Value::from(start)); |
|
// Push the whole string being examined |
|
results.push(Value::from(primitive_val.to_string())); |
|
|
|
let result = context.call(&replace_object, this, &results)?; |
|
|
|
result.to_string(context)?.to_string() |
|
} |
|
_ => "undefined".to_string(), |
|
} |
|
} else { |
|
"undefined".to_string() |
|
}; |
|
|
|
Ok(Value::from(primitive_val.replacen( |
|
&primitive_val[mat.range()], |
|
&replace_value, |
|
1, |
|
))) |
|
} |
|
|
|
/// `String.prototype.indexOf( searchValue[, fromIndex] )` |
|
/// |
|
/// The `indexOf()` method returns the index within the calling `String` object of the first occurrence |
|
/// of the specified value, starting the search at `fromIndex`. |
|
/// |
|
/// Returns `-1` if the value is not found. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.indexof |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf |
|
pub(crate) fn index_of(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
let this = this.require_object_coercible(context)?; |
|
let string = this.to_string(context)?; |
|
|
|
let search_string = args |
|
.get(0) |
|
.cloned() |
|
.unwrap_or_else(Value::undefined) |
|
.to_string(context)?; |
|
|
|
let length = string.chars().count(); |
|
let start = args |
|
.get(1) |
|
.map(|position| position.to_integer(context)) |
|
.transpose()? |
|
.map_or(0, |position| position.max(0.0).min(length as f64) as usize); |
|
|
|
if search_string.is_empty() { |
|
return Ok(start.min(length).into()); |
|
} |
|
|
|
if start < length { |
|
if let Some(position) = string.find(search_string.as_str()) { |
|
return Ok(string[..position].chars().count().into()); |
|
} |
|
} |
|
|
|
Ok(Value::from(-1)) |
|
} |
|
|
|
/// `String.prototype.lastIndexOf( searchValue[, fromIndex] )` |
|
/// |
|
/// The `lastIndexOf()` method returns the index within the calling `String` object of the last occurrence |
|
/// of the specified value, searching backwards from `fromIndex`. |
|
/// |
|
/// Returns `-1` if the value is not found. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.lastindexof |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/lastIndexOf |
|
pub(crate) fn last_index_of( |
|
this: &Value, |
|
args: &[Value], |
|
context: &mut Context, |
|
) -> Result<Value> { |
|
let this = this.require_object_coercible(context)?; |
|
let string = this.to_string(context)?; |
|
|
|
let search_string = args |
|
.get(0) |
|
.cloned() |
|
.unwrap_or_else(Value::undefined) |
|
.to_string(context)?; |
|
|
|
let length = string.chars().count(); |
|
let start = args |
|
.get(1) |
|
.map(|position| position.to_integer(context)) |
|
.transpose()? |
|
.map_or(0, |position| position.max(0.0).min(length as f64) as usize); |
|
|
|
if search_string.is_empty() { |
|
return Ok(start.min(length).into()); |
|
} |
|
|
|
if start < length { |
|
if let Some(position) = string.rfind(search_string.as_str()) { |
|
return Ok(string[..position].chars().count().into()); |
|
} |
|
} |
|
|
|
Ok(Value::from(-1)) |
|
} |
|
|
|
/// `String.prototype.match( regexp )` |
|
/// |
|
/// The `match()` method retrieves the result of matching a **string** against a [`regular expression`][regex]. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.match |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/match |
|
/// [regex]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions |
|
pub(crate) fn r#match(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
let re = RegExp::constructor( |
|
&Value::from(Object::default()), |
|
&[args.get(0).cloned().unwrap_or_default()], |
|
context, |
|
)?; |
|
RegExp::r#match(&re, this.to_string(context)?, context) |
|
} |
|
|
|
/// Abstract method `StringPad`. |
|
/// |
|
/// Performs the actual string padding for padStart/End. |
|
/// <https://tc39.es/ecma262/#sec-stringpad/> |
|
fn string_pad( |
|
primitive: RcString, |
|
max_length: i32, |
|
fill_string: Option<RcString>, |
|
at_start: bool, |
|
) -> Result<Value> { |
|
let primitive_length = primitive.len() as i32; |
|
|
|
if max_length <= primitive_length { |
|
return Ok(Value::from(primitive)); |
|
} |
|
|
|
let filter = fill_string.as_deref().unwrap_or(" "); |
|
|
|
let fill_len = max_length.wrapping_sub(primitive_length); |
|
let mut fill_str = StdString::new(); |
|
|
|
while fill_str.len() < fill_len as usize { |
|
fill_str.push_str(filter); |
|
} |
|
// Cut to size max_length |
|
let concat_fill_str: StdString = fill_str.chars().take(fill_len as usize).collect(); |
|
|
|
if at_start { |
|
Ok(Value::from(format!("{}{}", concat_fill_str, &primitive))) |
|
} else { |
|
Ok(Value::from(format!("{}{}", primitive, &concat_fill_str))) |
|
} |
|
} |
|
|
|
/// `String.prototype.padEnd( targetLength[, padString] )` |
|
/// |
|
/// The `padEnd()` method pads the current string with a given string (repeated, if needed) so that the resulting string reaches a given length. |
|
/// |
|
/// The padding is applied from the end of the current string. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.padend |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padEnd |
|
pub(crate) fn pad_end(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
let primitive = this.to_string(context)?; |
|
if args.is_empty() { |
|
return Err(Value::from("padEnd requires maxLength argument")); |
|
} |
|
let max_length = args |
|
.get(0) |
|
.expect("failed to get argument for String method") |
|
.to_integer(context)? as i32; |
|
|
|
let fill_string = args.get(1).map(|arg| arg.to_string(context)).transpose()?; |
|
|
|
Self::string_pad(primitive, max_length, fill_string, false) |
|
} |
|
|
|
/// `String.prototype.padStart( targetLength [, padString] )` |
|
/// |
|
/// The `padStart()` method pads the current string with another string (multiple times, if needed) until the resulting string reaches the given length. |
|
/// |
|
/// The padding is applied from the start of the current string. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.padstart |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart |
|
pub(crate) fn pad_start(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
let primitive = this.to_string(context)?; |
|
if args.is_empty() { |
|
return Err(Value::from("padStart requires maxLength argument")); |
|
} |
|
let max_length = args |
|
.get(0) |
|
.expect("failed to get argument for String method") |
|
.to_integer(context)? as i32; |
|
|
|
let fill_string = args.get(1).map(|arg| arg.to_string(context)).transpose()?; |
|
|
|
Self::string_pad(primitive, max_length, fill_string, true) |
|
} |
|
|
|
/// Helper function to check if a `char` is trimmable. |
|
#[inline] |
|
fn is_trimmable_whitespace(c: char) -> bool { |
|
// The rust implementation of `trim` does not regard the same characters whitespace as ecma standard does |
|
// |
|
// Rust uses \p{White_Space} by default, which also includes: |
|
// `\u{0085}' (next line) |
|
// And does not include: |
|
// '\u{FEFF}' (zero width non-breaking space) |
|
// Explicit whitespace: https://tc39.es/ecma262/#sec-white-space |
|
matches!( |
|
c, |
|
'\u{0009}' | '\u{000B}' | '\u{000C}' | '\u{0020}' | '\u{00A0}' | '\u{FEFF}' | |
|
// Unicode Space_Seperator category |
|
'\u{1680}' | '\u{2000}' |
|
..='\u{200A}' | '\u{202F}' | '\u{205F}' | '\u{3000}' | |
|
// Line terminators: https://tc39.es/ecma262/#sec-line-terminators |
|
'\u{000A}' | '\u{000D}' | '\u{2028}' | '\u{2029}' |
|
) |
|
} |
|
|
|
/// String.prototype.trim() |
|
/// |
|
/// The `trim()` method removes whitespace from both ends of a string. |
|
/// |
|
/// Whitespace in this context is all the whitespace characters (space, tab, no-break space, etc.) and all the line terminator characters (LF, CR, etc.). |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.trim |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trim |
|
pub(crate) fn trim(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> { |
|
let this = this.require_object_coercible(context)?; |
|
let string = this.to_string(context)?; |
|
Ok(Value::from( |
|
string.trim_matches(Self::is_trimmable_whitespace), |
|
)) |
|
} |
|
|
|
/// `String.prototype.trimStart()` |
|
/// |
|
/// The `trimStart()` method removes whitespace from the beginning of a string. |
|
/// |
|
/// Whitespace in this context is all the whitespace characters (space, tab, no-break space, etc.) and all the line terminator characters (LF, CR, etc.). |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.trimstart |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trimStart |
|
pub(crate) fn trim_start(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> { |
|
let string = this.to_string(context)?; |
|
Ok(Value::from( |
|
string.trim_start_matches(Self::is_trimmable_whitespace), |
|
)) |
|
} |
|
|
|
/// String.prototype.trimEnd() |
|
/// |
|
/// The `trimEnd()` method removes whitespace from the end of a string. |
|
/// |
|
/// Whitespace in this context is all the whitespace characters (space, tab, no-break space, etc.) and all the line terminator characters (LF, CR, etc.). |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.trimend |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/trimEnd |
|
pub(crate) fn trim_end(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> { |
|
let this = this.require_object_coercible(context)?; |
|
let string = this.to_string(context)?; |
|
Ok(Value::from( |
|
string.trim_end_matches(Self::is_trimmable_whitespace), |
|
)) |
|
} |
|
|
|
/// `String.prototype.toLowerCase()` |
|
/// |
|
/// The `toLowerCase()` method returns the calling string value converted to lower case. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.tolowercase |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toLowerCase |
|
#[allow(clippy::wrong_self_convention)] |
|
pub(crate) fn to_lowercase(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> { |
|
// First we get it the actual string a private field stored on the object only the context has access to. |
|
// Then we convert it into a Rust String by wrapping it in from_value |
|
let this_str = this.to_string(context)?; |
|
// The Rust String is mapped to uppercase using the builtin .to_lowercase(). |
|
// There might be corner cases where it does not behave exactly like Javascript expects |
|
Ok(Value::from(this_str.to_lowercase())) |
|
} |
|
|
|
/// `String.prototype.toUpperCase()` |
|
/// |
|
/// The `toUpperCase()` method returns the calling string value converted to uppercase. |
|
/// |
|
/// The value will be **converted** to a string if it isn't one |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.toUppercase |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase |
|
#[allow(clippy::wrong_self_convention)] |
|
pub(crate) fn to_uppercase(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> { |
|
// First we get it the actual string a private field stored on the object only the context has access to. |
|
// Then we convert it into a Rust String by wrapping it in from_value |
|
let this_str = this.to_string(context)?; |
|
// The Rust String is mapped to uppercase using the builtin .to_uppercase(). |
|
// There might be corner cases where it does not behave exactly like Javascript expects |
|
Ok(Value::from(this_str.to_uppercase())) |
|
} |
|
|
|
/// `String.prototype.substring( indexStart[, indexEnd] )` |
|
/// |
|
/// The `substring()` method returns the part of the `string` between the start and end indexes, or to the end of the string. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.substring |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substring |
|
pub(crate) fn substring(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
// First we get it the actual string a private field stored on the object only the context has access to. |
|
// Then we convert it into a Rust String by wrapping it in from_value |
|
let primitive_val = this.to_string(context)?; |
|
// If no args are specified, start is 'undefined', defaults to 0 |
|
let start = if args.is_empty() { |
|
0 |
|
} else { |
|
args.get(0) |
|
.expect("failed to get argument for String method") |
|
.to_integer(context)? as i32 |
|
}; |
|
let length = primitive_val.encode_utf16().count() as i32; |
|
// If less than 2 args specified, end is the length of the this object converted to a String |
|
let end = if args.len() < 2 { |
|
length |
|
} else { |
|
args.get(1) |
|
.expect("Could not get argument") |
|
.to_integer(context)? as i32 |
|
}; |
|
// Both start and end args replaced by 0 if they were negative |
|
// or by the length of the String if they were greater |
|
let final_start = min(max(start, 0), length); |
|
let final_end = min(max(end, 0), length); |
|
// Start and end are swapped if start is greater than end |
|
let from = min(final_start, final_end) as usize; |
|
let to = max(final_start, final_end) as usize; |
|
// Extract the part of the string contained between the start index and the end index |
|
// where start is guaranteed to be smaller or equals to end |
|
let extracted_string: std::result::Result<StdString, _> = decode_utf16( |
|
primitive_val |
|
.encode_utf16() |
|
.skip(from) |
|
.take(to.wrapping_sub(from)), |
|
) |
|
.collect(); |
|
Ok(Value::from(extracted_string.expect("Invalid string"))) |
|
} |
|
|
|
/// `String.prototype.substr( start[, length] )` |
|
/// |
|
/// The `substr()` method returns a portion of the string, starting at the specified index and extending for a given number of characters afterward. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.substr |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr |
|
/// <https://tc39.es/ecma262/#sec-string.prototype.substr> |
|
pub(crate) fn substr(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
// First we get it the actual string a private field stored on the object only the context has access to. |
|
// Then we convert it into a Rust String by wrapping it in from_value |
|
let primitive_val = this.to_string(context)?; |
|
// If no args are specified, start is 'undefined', defaults to 0 |
|
let mut start = if args.is_empty() { |
|
0 |
|
} else { |
|
args.get(0) |
|
.expect("failed to get argument for String method") |
|
.to_integer(context)? as i32 |
|
}; |
|
let length = primitive_val.chars().count() as i32; |
|
// If less than 2 args specified, end is +infinity, the maximum number value. |
|
// Using i32::max_value() should be safe because the final length used is at most |
|
// the number of code units from start to the end of the string, |
|
// which should always be smaller or equals to both +infinity and i32::max_value |
|
let end = if args.len() < 2 { |
|
i32::max_value() |
|
} else { |
|
args.get(1) |
|
.expect("Could not get argument") |
|
.to_integer(context)? as i32 |
|
}; |
|
// If start is negative it become the number of code units from the end of the string |
|
if start < 0 { |
|
start = max(length.wrapping_add(start), 0); |
|
} |
|
// length replaced by 0 if it was negative |
|
// or by the number of code units from start to the end of the string if it was greater |
|
let result_length = min(max(end, 0), length.wrapping_sub(start)); |
|
// If length is negative we return an empty string |
|
// otherwise we extract the part of the string from start and is length code units long |
|
if result_length <= 0 { |
|
Ok(Value::from("")) |
|
} else { |
|
let extracted_string: StdString = primitive_val |
|
.chars() |
|
.skip(start as usize) |
|
.take(result_length as usize) |
|
.collect(); |
|
|
|
Ok(Value::from(extracted_string)) |
|
} |
|
} |
|
|
|
/// String.prototype.split() |
|
/// |
|
/// The `split()` method divides a String into an ordered list of substrings, puts these substrings into an array, and returns the array. |
|
/// |
|
/// The division is done by searching for a pattern; where the pattern is provided as the first parameter in the method's call. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.split |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split |
|
pub(crate) fn split(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
let this = this.require_object_coercible(context)?; |
|
let string = this.to_string(context)?; |
|
|
|
let separator = args.get(0).filter(|value| !value.is_null_or_undefined()); |
|
|
|
if let Some(result) = separator |
|
.and_then(|separator| separator.as_object()) |
|
.and_then(|separator| { |
|
let key = context.well_known_symbols().split_symbol(); |
|
|
|
match separator.get_method(context, key) { |
|
Ok(splitter) => splitter.map(|splitter| { |
|
let arguments = &[ |
|
Value::from(string.clone()), |
|
args.get(1) |
|
.map(|x| x.to_owned()) |
|
.unwrap_or(Value::Undefined), |
|
]; |
|
splitter.call(this, arguments, context) |
|
}), |
|
Err(_) => Some(Err( |
|
context.construct_type_error("separator[Symbol.split] is not a function") |
|
)), |
|
} |
|
}) |
|
{ |
|
return result; |
|
} |
|
|
|
let separator = separator |
|
.map(|separator| separator.to_string(context)) |
|
.transpose()?; |
|
|
|
let limit = args |
|
.get(1) |
|
.map(|arg| arg.to_integer(context).map(|limit| limit as usize)) |
|
.transpose()? |
|
.unwrap_or(std::u32::MAX as usize); |
|
|
|
let values: Vec<Value> = match separator { |
|
None if limit == 0 => vec![], |
|
None => vec![Value::from(string)], |
|
Some(separator) if separator.is_empty() => string |
|
.encode_utf16() |
|
// TODO: Support keeping invalid code point in string |
|
.map(|cp| Value::from(std::string::String::from_utf16_lossy(&[cp]))) |
|
.take(limit) |
|
.collect(), |
|
Some(separator) => string |
|
.split(separator.as_str()) |
|
.map(&Value::from) |
|
.take(limit) |
|
.collect(), |
|
}; |
|
|
|
let new = Array::new_array(context)?; |
|
Array::construct_array(&new, &values, context) |
|
} |
|
|
|
/// String.prototype.valueOf() |
|
/// |
|
/// The `valueOf()` method returns the primitive value of a `String` object. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.value_of |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/valueOf |
|
pub(crate) fn value_of(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
// Use the to_string method because it is specified to do the same thing in this case |
|
Self::to_string(this, args, context) |
|
} |
|
|
|
/// `String.prototype.matchAll( regexp )` |
|
/// |
|
/// The `matchAll()` method returns an iterator of all results matching a string against a [`regular expression`][regex], including [capturing groups][cg]. |
|
/// |
|
/// More information: |
|
/// - [ECMAScript reference][spec] |
|
/// - [MDN documentation][mdn] |
|
/// |
|
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.matchall |
|
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/matchAll |
|
/// [regex]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions |
|
/// [cg]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Groups_and_Ranges |
|
// TODO: update this method to return iterator |
|
pub(crate) fn match_all(this: &Value, args: &[Value], context: &mut Context) -> Result<Value> { |
|
let re: Value = match args.get(0) { |
|
Some(arg) => { |
|
if arg.is_null() { |
|
RegExp::constructor( |
|
&Value::from(Object::default()), |
|
&[Value::from(arg.to_string(context)?), Value::from("g")], |
|
context, |
|
) |
|
} else if arg.is_undefined() { |
|
RegExp::constructor( |
|
&Value::from(Object::default()), |
|
&[Value::undefined(), Value::from("g")], |
|
context, |
|
) |
|
} else { |
|
Ok(arg.clone()) |
|
} |
|
} |
|
None => RegExp::constructor( |
|
&Value::from(Object::default()), |
|
&[Value::from(""), Value::from("g")], |
|
context, |
|
), |
|
}?; |
|
|
|
RegExp::match_all(&re, this.to_string(context)?.to_string(), context) |
|
} |
|
|
|
pub(crate) fn iterator(this: &Value, _: &[Value], context: &mut Context) -> Result<Value> { |
|
StringIterator::create_string_iterator(context, this.clone()) |
|
} |
|
}
|
|
|