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https://github.com/typst/typst
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Add default
argument for str.first
and str.last
(#6554)
Co-authored-by: Laurenz <laurmaedje@gmail.com>
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parent
9e6adb6f45
commit
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@ -179,24 +179,40 @@ impl Str {
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}
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/// Extracts the first grapheme cluster of the string.
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/// Fails with an error if the string is empty.
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///
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/// Returns the provided default value if the string is empty or fails with
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/// an error if no default value was specified.
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#[func]
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pub fn first(&self) -> StrResult<Str> {
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pub fn first(
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&self,
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/// A default value to return if the string is empty.
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#[named]
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default: Option<Str>,
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) -> StrResult<Str> {
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self.0
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.graphemes(true)
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.next()
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.map(Into::into)
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.or(default)
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.ok_or_else(string_is_empty)
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}
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/// Extracts the last grapheme cluster of the string.
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/// Fails with an error if the string is empty.
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///
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/// Returns the provided default value if the string is empty or fails with
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/// an error if no default value was specified.
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#[func]
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pub fn last(&self) -> StrResult<Str> {
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pub fn last(
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&self,
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/// A default value to return if the string is empty.
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#[named]
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default: Option<Str>,
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) -> StrResult<Str> {
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self.0
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.graphemes(true)
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.next_back()
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.map(Into::into)
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.or(default)
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.ok_or_else(string_is_empty)
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}
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@ -103,6 +103,10 @@
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#test("Hello".last(), "o")
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#test("🏳️🌈A🏳️⚧️".first(), "🏳️🌈")
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#test("🏳️🌈A🏳️⚧️".last(), "🏳️⚧️")
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#test("hey".first(default: "d"), "h")
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#test("".first(default: "d"), "d")
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#test("hey".last(default: "d"), "y")
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#test("".last(default: "d"), "d")
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--- string-first-empty ---
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// Error: 2-12 string is empty
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