Implement the non-recursive lookup_mut
Also include some tests simply by copying and modifying the other tests for lookup.
This commit is contained in:
parent
9b1dc843fc
commit
32969ca891
126
src/lib.rs
126
src/lib.rs
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@ -44,7 +44,6 @@
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use std::collections::BTreeMap;
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use std::str::FromStr;
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use std::str::Split;
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pub use parser::{Parser, ParserError};
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@ -208,28 +207,6 @@ impl Value {
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Some(cur_value)
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}
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fn lookup_mut_recurse<'a>(&'a mut self, matches: &mut Split<'a, char>) -> Option<&'a mut Value> {
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if let Some(key) = matches.next() {
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match *self {
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Value::Table(ref mut hm) => {
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match hm.get_mut(key) {
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Some(v) => return v.lookup_mut_recurse(matches),
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None => return None,
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}
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},
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Value::Array(ref mut v) => {
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match key.parse::<usize>().ok() {
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Some(idx) if idx < v.len()
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=> return (&mut v[idx]).lookup_mut_recurse(matches),
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_ => return None,
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}
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},
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_ => return None
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}
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}
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Some(self)
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}
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/// Lookups for mutable value at specified path.
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///
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/// Uses '.' as a path separator.
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@ -259,15 +236,32 @@ impl Value {
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/// let result = value.lookup_mut("test.foo").unwrap();
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/// assert_eq!(result.as_str().unwrap(), "foo");
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/// ```
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pub fn lookup_mut<'a>(&'a mut self, path: &'a str) -> Option<&'a mut Value> {
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if path.len() == 0 {
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return Some(self)
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}
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let mut matches = path.split('.');
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self.lookup_mut_recurse(&mut matches)
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}
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pub fn lookup_mut(&mut self, path: &str) -> Option<&mut Value> {
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let mut cur = self;
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if path.len() == 0 {
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return Some(cur)
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}
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for key in path.split('.') {
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let tmp = cur;
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match *tmp {
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Value::Table(ref mut hm) => {
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match hm.get_mut(key) {
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Some(v) => cur = v,
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None => return None
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}
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}
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Value::Array(ref mut v) => {
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match key.parse::<usize>().ok() {
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Some(idx) if idx < v.len() => cur = &mut v[idx],
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_ => return None
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}
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}
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_ => return None
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}
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}
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Some(cur)
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}
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}
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impl FromStr for Value {
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@ -285,6 +279,76 @@ impl FromStr for Value {
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mod tests {
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use super::Value;
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#[test]
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fn lookup_mut_valid() {
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let toml = r#"
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[test]
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foo = "bar"
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[[values]]
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foo = "baz"
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[[values]]
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foo = "qux"
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"#;
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let mut value: Value = toml.parse().unwrap();
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{
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let test_foo = value.lookup_mut("test.foo").unwrap();
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assert_eq!(test_foo.as_str().unwrap(), "bar");
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}
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{
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let foo1 = value.lookup_mut("values.1.foo").unwrap();
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assert_eq!(foo1.as_str().unwrap(), "qux");
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}
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assert!(value.lookup_mut("test.bar").is_none());
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assert!(value.lookup_mut("test.foo.bar").is_none());
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}
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#[test]
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fn lookup_mut_invalid_index() {
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let toml = r#"
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[[values]]
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foo = "baz"
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"#;
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let mut value: Value = toml.parse().unwrap();
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{
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let foo = value.lookup_mut("test.foo");
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assert!(foo.is_none());
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}
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{
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let foo = value.lookup_mut("values.100.foo");
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assert!(foo.is_none());
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}
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{
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let foo = value.lookup_mut("values.str.foo");
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assert!(foo.is_none());
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}
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}
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#[test]
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fn lookup_mut_self() {
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let mut value: Value = r#"foo = "bar""#.parse().unwrap();
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{
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let foo = value.lookup_mut("foo").unwrap();
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assert_eq!(foo.as_str().unwrap(), "bar");
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}
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let foo = value.lookup_mut("").unwrap();
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assert!(foo.as_table().is_some());
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let baz = foo.lookup_mut("foo").unwrap();
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assert_eq!(baz.as_str().unwrap(), "bar");
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}
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#[test]
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fn lookup_valid() {
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let toml = r#"
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