Rust Text Processing: Characters, Strings, and Conversions
Explore the world of text processing in Rust with a focus on characters, strings, and conversions. Learn about Unicode code points, string ownership, character methods, string comparisons, text iterators, formatting, and parsing. Enhance your Rust programming skills in text manipulation and analysis.
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Presentation Transcript
E81 CSE 542S: Concurrency and Memory Safe System Software Development Strings and Text Department of Computer Science & Engineering Chris Gill cdgill@wustl.edu 1
Characters and Strings in Rust In Rust a char is a Unicode code point With ASCII and Latin-1 as disjoint subranges Helper methods help classify those, e.g., if c.is_ascii_alphanumeric() {...} A String is an owned text segment let s = Hello, world! .to_string(); A string slice is a borrowed text segment let t = Hello, world! ; // type &str 2 CSE 542S Concurrency and Memory Safe System Software Development
Character Conversions Rust provides methods for conversions E.g., from_digit, to_digit, to_lowercase You can also write your own conversions E.g., using arms of a match expression when checking for palindromes in French: match c { // note inclusive range use ... ' '..=' ' => {return 'a'} ... _ => {return c} } 3 CSE 542S Concurrency and Memory Safe System Software Development
Creating and using Strings Rust has many ways to create a String E.g., from a string slice via to_string E.g., from an iterator via collect Can compare strings for equivalence etc. E.g., if s == t {...} Can transform and then compare them if s.to_lowercase() == t.to_lowercase() {...} 4 CSE 542S Concurrency and Memory Safe System Software Development
Iterators over Text Rust text iterators are generally available E.g., chars() method of a string slice gives an iterator over individual characters in it E.g., lines() method of a string slice gives iterator over line-break delimited sub-slices Adapters then can be applied to those E.g., rev() to get a reverse iterator E.g., map() or filter() to transform or prune out characters within the text 5 CSE 542S Concurrency and Memory Safe System Software Development
Formatting and Parsing Text The format! macro has many uses E.g., can append values to to a string slice E.g., can column-align numeric values E.g., can print out box or reference address The regex crate helps you parse text You construct a regex::Regex and apply it to text and determine whether it matches May involve different forms of normalization for slices with characters like ' in them 6 CSE 542S Concurrency and Memory Safe System Software Development
Studio 16 Examine how Rust supports String and string slice representations of text Practice using iterators and closures to detect palindromes in English and French Studios 12 through 20 are due by 11:59pm on the night before Exam 2 Submit as soon as each is done so you get feedback and can resubmit any that may be marked incomplete 7 CSE 542S Concurrency and Memory Safe System Software Development
