@ -1,3 +1,14 @@
//! This module implements the global `String` object.
//!
//! The `String` global object is a constructor for strings or a sequence of characters.
//!
//! More information:
//! - [ECMAScript reference][spec]
//! - [MDN documentation][mdn]
//!
//! [spec]: https://tc39.es/ecma262/#sec-string-object
//! [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String
#[ cfg(test) ] #[ cfg(test) ]
mod tests ; mod tests ;
@ -20,7 +31,6 @@ use std::{
} ; } ;
/// Create new string [[Construct]]
/// Create new string [[Construct]]
/// <https://searchfox.org/mozilla-central/source/js/src/vm/StringObject.h#19>
// This gets called when a new String() is created, it's called by exec:346
// This gets called when a new String() is created, it's called by exec:346
pub fn make_string ( this : & Value , args : & [ Value ] , _ : & mut Interpreter ) -> ResultValue { pub fn make_string ( this : & Value , args : & [ Value ] , _ : & mut Interpreter ) -> ResultValue {
// If we're constructing a string, we should set the initial length
// If we're constructing a string, we should set the initial length
@ -41,7 +51,8 @@ pub fn make_string(this: &Value, args: &[Value], _: &mut Interpreter) -> ResultV
} }
/// Call new string [[Call]]
/// Call new string [[Call]]
/// https://tc39.es/ecma262/#sec-string-constructor-string-value
///
/// More information: [ECMAScript reference](https://tc39.es/ecma262/#sec-string-constructor-string-value)
pub fn call_string ( _ : & Value , args : & [ Value ] , _ : & mut Interpreter ) -> ResultValue { pub fn call_string ( _ : & Value , args : & [ Value ] , _ : & mut Interpreter ) -> ResultValue {
let arg = match args . get ( 0 ) { let arg = match args . get ( 0 ) {
Some ( v ) = > v . clone ( ) , Some ( v ) = > v . clone ( ) ,
@ -62,10 +73,22 @@ pub fn to_string(this: &Value, _: &[Value], _: &mut Interpreter) -> ResultValue
Ok ( to_value ( format! ( "{}" , primitive_val ) ) ) Ok ( to_value ( format! ( "{}" , primitive_val ) ) )
} }
/// Returns a single element String containing the code unit at index pos within the String value
/// `String.prototype.charAt( index )`
/// resulting from converting this object to a String. If there is no element at that index, the
///
/// result is the empty String. The result is a String value, not a String object.
/// 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.
/// <https://tc39.es/ecma262/#sec-string.prototype.charat>
///
/// Characters in a string are indexed from left to right. The index of the first character is `0`,
/// and the index of the last character—in a string called `stringName`—is `stringName.length - 1`.
/// If the `index` you supply is out of this range, JavaScript returns an empty string.
///
/// If no index is provided to `charAt()`, the default is `0`.
///
/// More information:
/// - [ECMAScript reference][spec]
/// - [MDN documentation][mdn]
///
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.charat
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charAt
pub fn char_at ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn char_at ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -96,10 +119,20 @@ pub fn char_at(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultVal
) ) ) )
} }
/// Returns a Number (a nonnegative integer less than 216) that is the numeric value of the code
/// `String.prototype.charCodeAt( index )`
/// unit at index pos within the String resulting from converting this object to a String. If there
///
/// is no element at that index, the result is NaN.
/// The `charCodeAt()` method returns an integer between `0` and `65535` representing the UTF-16 code unit at the given index.
/// <https://tc39.es/ecma262/#sec-string.prototype.charcodeat>
///
/// Unicode code points range from `0` to `1114111` (`0x10FFFF`). The first 128 Unicode code points are a direct match of the ASCII character encoding.
///
/// `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.
///
/// More information:
/// - [ECMAScript reference][spec]
/// - [MDN documentation][mdn]
///
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.charcodeat
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charCodeAt
pub fn char_code_at ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn char_code_at ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -128,9 +161,20 @@ pub fn char_code_at(this: &Value, args: &[Value], ctx: &mut Interpreter) -> Resu
Ok ( to_value ( f64 ::from ( utf16_val ) ) ) Ok ( to_value ( f64 ::from ( utf16_val ) ) )
} }
/// Returns a String that is the result of concatenating this String and all strings provided as
/// `String.prototype.concat( str1[, ...strN] )`
/// arguments
///
/// <https://tc39.es/ecma262/#sec-string.prototype.concat>
/// The `concat()` method concatenates the string arguments to the calling string and returns a new string.
///
/// Changes to the original string or the returned string don't affect the other.
///
/// If the arguments are not of the type string, they are converted to string values before concatenating.
///
/// More information:
/// - [ECMAScript reference][spec]
/// - [MDN documentation][mdn]
///
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.concat
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/concat
pub fn concat ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn concat ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -144,9 +188,17 @@ pub fn concat(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultValu
Ok ( to_value ( new_str ) ) Ok ( to_value ( new_str ) )
} }
/// Returns a String that is the result of repeating this String the number of times given by the
/// `String.prototype.repeat( count )`
/// first argument
///
/// <https://tc39.es/ecma262/#sec-string.prototype.repeat>
/// The `repeat()` method constructs and returns a new string which contains the specified number of
/// copies of the string on which it was called, concatenated together.
///
/// More information:
/// - [ECMAScript reference][spec]
/// - [MDN documentation][mdn]
///
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.repeat
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat
pub fn repeat ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn repeat ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -161,9 +213,16 @@ pub fn repeat(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultValu
Ok ( to_value ( primitive_val . repeat ( repeat_times ) ) ) Ok ( to_value ( primitive_val . repeat ( repeat_times ) ) )
} }
/// Returns a String which contains the slice of the JS String from character at "start" index up
/// `String.prototype.slice( beginIndex [, endIndex] )`
/// to but not including character at "end" index
///
/// <https://tc39.es/ecma262/#sec-string.prototype.slice>
/// 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]
///
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.slice
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice
pub fn slice ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn slice ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -211,10 +270,16 @@ pub fn slice(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultValue
Ok ( to_value ( new_str ) ) Ok ( to_value ( new_str ) )
} }
/// Returns a Boolean indicating whether the sequence of code units of the
/// `String.prototype.startWith( searchString[, position] )`
/// "search string" is the same as the corresponding code units of this string
///
/// starting at index "position"
/// The `startsWith()` method determines whether a string begins with the characters of a specified string, returning `true` or `false` as appropriate.
/// <https://tc39.es/ecma262/#sec-string.prototype.startswith>
///
/// 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 fn starts_with ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn starts_with ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -250,10 +315,16 @@ pub fn starts_with(this: &Value, args: &[Value], ctx: &mut Interpreter) -> Resul
} }
} }
/// Returns a Boolean indicating whether the sequence of code units of the
/// `String.prototype.endsWith( searchString[, length] )`
/// "search string" is the same as the corresponding code units of this string
///
/// starting at position "end position" - length
/// The `endsWith()` method determines whether a string ends with the characters of a specified string, returning `true` or `false` as appropriate.
/// <https://tc39.es/ecma262/#sec-string.prototype.endswith>
///
/// 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 fn ends_with ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn ends_with ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -291,11 +362,16 @@ pub fn ends_with(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultV
} }
} }
/// Returns a Boolean indicating whether searchString appears as a substring of
/// `String.prototype.includes( searchString[, position] )`
/// the result of converting this object to a String, at one or more indices
///
/// that are greater than or equal to position. If position is undefined, 0 is
/// The `includes()` method determines whether one string may be found within another string, returning `true` or `false` as appropriate.
/// assumed, so as to search all of the String.
///
/// <https://tc39.es/ecma262/#sec-string.prototype.includes>
/// 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 fn includes ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn includes ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -346,7 +422,21 @@ fn get_regex_string(value: &Value) -> String {
} }
} }
/// <https://tc39.es/ecma262/#sec-string.prototype.replace>
/// `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 fn replace ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn replace ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// TODO: Support Symbol replacer
// TODO: Support Symbol replacer
let primitive_val : String = ctx . value_to_rust_string ( this ) ; let primitive_val : String = ctx . value_to_rust_string ( this ) ;
@ -437,12 +527,18 @@ pub fn replace(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultVal
) ) ) ) ) )
} }
/// If searchString appears as a substring of the result of converting this
/// `String.prototype.indexOf( searchValue[, fromIndex] )`
/// object to a String, at one or more indices that are greater than or equal to
///
/// position, then the smallest such index is returned; otherwise, -1 is
/// The `indexOf()` method returns the index within the calling `String` object of the first occurrence of the specified value, starting the search at `fromIndex`.
/// returned. If position is undefined, 0 is assumed, so as to search all of the
///
/// String.
/// Returns -1 if the value is not found.
/// <https://tc39.es/ecma262/#sec-string.prototype.includes>
///
/// 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 fn index_of ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn index_of ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -483,12 +579,18 @@ pub fn index_of(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultVa
Ok ( to_value ( - 1 ) ) Ok ( to_value ( - 1 ) )
} }
//// If searchString appears as a substring of the result of converting this
/// `String.prototype.lastIndexOf( searchValue[, fromIndex] )`
/// object to a String at one or more indices that are smaller than or equal to
///
/// position, then the greatest such index is returned; otherwise, -1 is
/// The `lastIndexOf()` method returns the index within the calling `String` object of the last occurrence of the specified value, searching backwards from `fromIndex`.
/// returned. If position is undefined, the length of the String value is
///
/// assumed, so as to search all of the String.
/// Returns -1 if the value is not found.
/// <https://tc39.es/ecma262/#sec-string.prototype.lastindexof>
///
/// 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 fn last_index_of ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn last_index_of ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -530,16 +632,24 @@ pub fn last_index_of(this: &Value, args: &[Value], ctx: &mut Interpreter) -> Res
Ok ( to_value ( highest_index ) ) Ok ( to_value ( highest_index ) )
} }
/// Returns an array whose contents is all the results matching the regular expression, if the global (g) flag is present,
/// `String.prototype.match( regexp )`
/// in its absence, only the first complete match and its related capturing groups is returned,
///
/// otherwise null is returned if no match is found.
/// The `match()` method retrieves the result of matching a **string** against a [`regular expression`][regex].
/// <https://tc39.es/ecma262/#sec-string.prototype.match>
///
/// 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 fn r #match ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn r #match ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
let re = make_regexp ( & to_value ( Object ::default ( ) ) , & [ args [ 0 ] . clone ( ) ] , ctx ) ? ; let re = make_regexp ( & to_value ( Object ::default ( ) ) , & [ args [ 0 ] . clone ( ) ] , ctx ) ? ;
regexp_match ( & re , ctx . value_to_rust_string ( this ) , ctx ) regexp_match ( & re , ctx . value_to_rust_string ( this ) , ctx )
} }
/// Abstract method `StringPad`
/// Abstract method `StringPad`.
///
/// Performs the actual string padding for padStart/End.
/// Performs the actual string padding for padStart/End.
/// <https://tc39.es/ecma262/#sec-stringpad/>
/// <https://tc39.es/ecma262/#sec-stringpad/>
fn string_pad ( fn string_pad (
@ -579,11 +689,18 @@ fn string_pad(
} }
} }
/// String.prototype.padEnd ( maxLength [ , fillString ] )
/// `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.
///
///
/// Pads the string with the given filler at the end of the string.
/// The padding is applied from the end of the current string.
/// Filler defaults to single space.
///
/// <https://tc39.es/ecma262/#sec-string.prototype.padend/>
/// 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 fn pad_end ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn pad_end ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
let primitive_val : String = ctx . value_to_rust_string ( this ) ; let primitive_val : String = ctx . value_to_rust_string ( this ) ;
if args . is_empty ( ) { if args . is_empty ( ) {
@ -606,11 +723,18 @@ pub fn pad_end(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultVal
string_pad ( primitive_val , max_length , fill_string , false ) string_pad ( primitive_val , max_length , fill_string , false )
} }
/// String.prototype.padStart ( maxLength [ , fillString ] )
/// `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]
///
///
/// Pads the string with the given filler at the start of the string.
/// [spec]: https://tc39.es/ecma262/#sec-string.prototype.padstart
/// Filler defaults to single space.
/// [mdn]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart
/// <https://tc39.es/ecma262/#sec-string.prototype.padstart/>
pub fn pad_start ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn pad_start ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
let primitive_val : String = ctx . value_to_rust_string ( this ) ; let primitive_val : String = ctx . value_to_rust_string ( this ) ;
if args . is_empty ( ) { if args . is_empty ( ) {
@ -633,6 +757,7 @@ pub fn pad_start(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultV
string_pad ( primitive_val , max_length , fill_string , true ) string_pad ( primitive_val , max_length , fill_string , true )
} }
/// Helper function to check if a `char` is trimmable.
fn is_trimmable_whitespace ( c : char ) -> bool { fn is_trimmable_whitespace ( c : char ) -> bool {
// The rust implementation of `trim` does not regard the same characters whitespace as ecma standard does
// The rust implementation of `trim` does not regard the same characters whitespace as ecma standard does
//
//
@ -651,11 +776,35 @@ fn is_trimmable_whitespace(c: char) -> bool {
} }
} }
/// 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 fn trim ( this : & Value , _ : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn trim ( this : & Value , _ : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
let this_str : String = ctx . value_to_rust_string ( this ) ; let this_str : String = ctx . value_to_rust_string ( this ) ;
Ok ( to_value ( this_str . trim_matches ( is_trimmable_whitespace ) ) ) Ok ( to_value ( this_str . trim_matches ( 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 fn trim_start ( this : & Value , _ : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn trim_start ( this : & Value , _ : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
let this_str : String = ctx . value_to_rust_string ( this ) ; let this_str : String = ctx . value_to_rust_string ( this ) ;
Ok ( to_value ( Ok ( to_value (
@ -663,14 +812,33 @@ pub fn trim_start(this: &Value, _: &[Value], ctx: &mut Interpreter) -> ResultVal
) ) ) )
} }
/// 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 fn trim_end ( this : & Value , _ : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn trim_end ( this : & Value , _ : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
let this_str : String = ctx . value_to_rust_string ( this ) ; let this_str : String = ctx . value_to_rust_string ( this ) ;
Ok ( to_value ( this_str . trim_end_matches ( is_trimmable_whitespace ) ) ) Ok ( to_value ( this_str . trim_end_matches ( is_trimmable_whitespace ) ) )
} }
/// Return a String with every code point mapped to its corresponding lowercase equivalent.
/// `String.prototype.toLowerCase()`
/// With the current implementation the string is always copied even if the resulting String is identical
///
/// <https://tc39.es/ecma262/#sec-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
pub fn to_lowercase ( this : & Value , _ : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn to_lowercase ( this : & Value , _ : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -680,9 +848,18 @@ pub fn to_lowercase(this: &Value, _: &[Value], ctx: &mut Interpreter) -> ResultV
Ok ( to_value ( this_str . to_lowercase ( ) ) ) Ok ( to_value ( this_str . to_lowercase ( ) ) )
} }
/// Return a String with every code point mapped to its corresponding uppercase equivalent.
/// `String.prototype.toUpperCase()`
/// With the current implementation the string is always copied even if the resulting String is identical
///
/// <https://tc39.es/ecma262/#sec-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
pub fn to_uppercase ( this : & Value , _ : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn to_uppercase ( this : & Value , _ : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -692,13 +869,16 @@ pub fn to_uppercase(this: &Value, _: &[Value], ctx: &mut Interpreter) -> ResultV
Ok ( to_value ( this_str . to_uppercase ( ) ) ) Ok ( to_value ( this_str . to_uppercase ( ) ) )
} }
/// Return a String which is a subset of the String value resulting from converting this object to a String.
/// `String.prototype.substring( indexStart[, indexEnd] )`
/// The subset of the string is contained between the start index and the end index.
///
/// When both the start and end arguments are specified, the smaller one represent the index of the code unit
/// The `substring()` method returns the part of the `string` between the start and end indexes, or to the end of the string.
/// from which the returned String will start and the larger one the index of the code unit just after the end.
///
/// When only the start index is specified, the end index defaults to being the length of the string.
/// More information:
/// When no argument is specified, the returned String is the same as the original
/// - [ECMAScript reference][spec]
/// <https://tc39.es/ecma262/#sec-string.prototype.substring>
/// - [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 fn substring ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn substring ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
// Then we convert it into a Rust String by wrapping it in from_value
// Then we convert it into a Rust String by wrapping it in from_value
@ -739,11 +919,16 @@ pub fn substring(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultV
Ok ( to_value ( extracted_string ) ) Ok ( to_value ( extracted_string ) )
} }
/// Return a String which is a subset of the String value resulting from converting this object to a String.
/// `String.prototype.substr( start[, length] )`
/// The subset of the string starts at the start index and is at most length code units long, depending if the string is shorter.
///
/// When only the start index is specified, the length become the length of the string.
/// The `substr()` method returns a portion of the string, starting at the specified index and extending for a given number of characters afterward.
/// When the start index is negative, the start index become the number of code units from the end of the string.
///
/// When no argument is specified, the returned String is the same as the original
/// 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>
/// <https://tc39.es/ecma262/#sec-string.prototype.substr>
pub fn substr ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn substr ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// First we get it the actual string a private field stored on the object only the engine has access to.
// First we get it the actual string a private field stored on the object only the engine has access to.
@ -792,16 +977,34 @@ pub fn substr(this: &Value, args: &[Value], ctx: &mut Interpreter) -> ResultValu
} }
} }
/// Get the string value to a primitive string
/// String.prototype.valueOf()
/// <https://tc39.es/ecma262/#sec-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 fn value_of ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn value_of ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
// Use the to_string method because it is specified to do the same thing in this case
// Use the to_string method because it is specified to do the same thing in this case
to_string ( this , args , ctx ) to_string ( this , args , ctx )
} }
/// TODO: update this method to return iterator
/// `String.prototype.matchAll( regexp )`
/// Returns an array* of all results matching a string against a regular expression, including capturing groups
///
/// <https://tc39.es/ecma262/#sec-string.prototype.matchall>
/// 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 fn match_all ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue { pub fn match_all ( this : & Value , args : & [ Value ] , ctx : & mut Interpreter ) -> ResultValue {
let re : Value = match args . get ( 0 ) { let re : Value = match args . get ( 0 ) {
Some ( arg ) = > { Some ( arg ) = > {
HalidOdat
5 years ago
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