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// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms. /// The set of user configurable options for compiling zero or more regexes. #[derive(Clone, Debug)] pub struct RegexOptions { pub pats: Vec<String>, pub size_limit: usize, pub dfa_size_limit: usize, pub case_insensitive: bool, pub multi_line: bool, pub dot_matches_new_line: bool, pub swap_greed: bool, pub ignore_whitespace: bool, pub unicode: bool, } impl Default for RegexOptions { fn default() -> Self { RegexOptions { pats: vec![], size_limit: 10 * (1<<20), dfa_size_limit: 2 * (1<<20), case_insensitive: false, multi_line: false, dot_matches_new_line: false, swap_greed: false, ignore_whitespace: false, unicode: true, } } } macro_rules! define_builder { ($name:ident, $regex_mod:ident, $unicode:expr, $only_utf8:expr) => { pub mod $name { use error::Error; use exec::ExecBuilder; use super::RegexOptions; use $regex_mod::Regex; /// A configurable builder for a regular expression. /// /// A builder can be used to configure how the regex is built, for example, by /// setting the default flags (which can be overridden in the expression /// itself) or setting various limits. pub struct RegexBuilder(RegexOptions); impl RegexBuilder { /// Create a new regular expression builder with the given pattern. /// /// If the pattern is invalid, then an error will be returned when /// `compile` is called. pub fn new(pattern: &str) -> RegexBuilder { let mut builder = RegexBuilder(RegexOptions::default()); builder.0.pats.push(pattern.to_owned()); builder.0.unicode = $unicode; builder } /// Consume the builder and compile the regular expression. /// /// Note that calling `as_str` on the resulting `Regex` will produce the /// pattern given to `new` verbatim. Notably, it will not incorporate any /// of the flags set on this builder. pub fn compile(self) -> Result<Regex, Error> { ExecBuilder::new_options(self.0) .only_utf8($only_utf8) .build() .map(Regex::from) } /// Set the value for the case insensitive (`i`) flag. pub fn case_insensitive(mut self, yes: bool) -> RegexBuilder { self.0.case_insensitive = yes; self } /// Set the value for the multi-line matching (`m`) flag. pub fn multi_line(mut self, yes: bool) -> RegexBuilder { self.0.multi_line = yes; self } /// Set the value for the any character (`s`) flag, where in `.` matches /// anything when `s` is set and matches anything except for new line when /// it is not set (the default). /// /// N.B. "matches anything" means "any byte" for `regex::bytes::Regex` /// expressions and means "any Unicode codepoint" for `regex::Regex` /// expressions. pub fn dot_matches_new_line(mut self, yes: bool) -> RegexBuilder { self.0.dot_matches_new_line = yes; self } /// Set the value for the greedy swap (`U`) flag. pub fn swap_greed(mut self, yes: bool) -> RegexBuilder { self.0.swap_greed = yes; self } /// Set the value for the ignore whitespace (`x`) flag. pub fn ignore_whitespace(mut self, yes: bool) -> RegexBuilder { self.0.ignore_whitespace = yes; self } /// Set the value for the Unicode (`u`) flag. /// /// For byte based regular expressions, this is disabled by default. pub fn unicode(mut self, yes: bool) -> RegexBuilder { self.0.unicode = yes; self } /// Set the approximate size limit of the compiled regular expression. /// /// This roughly corresponds to the number of bytes occupied by a single /// compiled program. If the program exceeds this number, then a /// compilation error is returned. pub fn size_limit(mut self, limit: usize) -> RegexBuilder { self.0.size_limit = limit; self } /// Set the approximate size of the cache used by the DFA. /// /// This roughly corresponds to the number of bytes that the DFA will /// use while searching. /// /// Note that this is a *per thread* limit. There is no way to set a global /// limit. In particular, if a regex is used from multiple threads /// simulanteously, then each thread may use up to the number of bytes /// specified here. pub fn dfa_size_limit(mut self, limit: usize) -> RegexBuilder { self.0.dfa_size_limit = limit; self } } } } } define_builder!(bytes, re_bytes, false, false); define_builder!(unicode, re_unicode, true, true);