diff options
| -rw-r--r-- | src/lib.rs | 62 |
1 files changed, 62 insertions, 0 deletions
@@ -44,6 +44,7 @@ use std::collections::BTreeMap; use std::str::FromStr; +use std::str::Split; pub use parser::{Parser, ParserError}; @@ -206,6 +207,67 @@ impl Value { Some(cur_value) } + + fn lookup_mut_recurse<'a>(&'a mut self, matches: &mut Split<'a, char>) -> Option<&'a mut Value> { + if let Some(key) = matches.next() { + match *self { + Value::Table(ref mut hm) => { + match hm.get_mut(key) { + Some(v) => return v.lookup_mut_recurse(matches), + None => return None, + } + }, + Value::Array(ref mut v) => { + match key.parse::<usize>().ok() { + Some(idx) if idx < v.len() + => return (&mut v[idx]).lookup_mut_recurse(matches), + _ => return None, + } + }, + _ => return None + } + } + Some(self) + } + + /// Lookups for mutable value at specified path. + /// + /// Uses '.' as a path separator. + /// + /// Note: arrays have zero-based indexes. + /// + /// Note: empty path returns self. + /// + /// ``` + /// # #![allow(unstable)] + /// let toml = r#" + /// [test] + /// foo = "bar" + /// + /// [[values]] + /// foo = "baz" + /// + /// [[values]] + /// foo = "qux" + /// "#; + /// let mut value: toml::Value = toml.parse().unwrap(); + /// { + /// let string = value.lookup_mut("test.foo").unwrap(); + /// assert_eq!(string, &mut toml::Value::String(String::from("bar"))); + /// *string = toml::Value::String(String::from("foo")); + /// } + /// let result = value.lookup_mut("test.foo").unwrap(); + /// assert_eq!(result.as_str().unwrap(), "foo"); + /// ``` + pub fn lookup_mut<'a>(&'a mut self, path: &'a str) -> Option<&'a mut Value> { + if path.len() == 0 { + return Some(self) + } + + let mut matches = path.split('.'); + self.lookup_mut_recurse(&mut matches) + } + } impl FromStr for Value { |