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use failure::{format_err, Error};
use serde_json::{self, Map, Value};
use std::collections::{hash_map::Entry, HashMap};
use std::fs;
use std::path::Path;
#[derive(Debug, Clone)]
pub struct Bindings {
bindings: HashMap<String, HashMap<String, String>>,
}
impl Bindings {
pub fn new(bindings: HashMap<String, HashMap<String, String>>) -> Bindings {
Self { bindings: bindings }
}
pub fn env(env: HashMap<String, String>) -> Bindings {
let mut bindings = HashMap::new();
bindings.insert("env".to_owned(), env);
Self::new(bindings)
}
pub fn empty() -> Bindings {
Self::new(HashMap::new())
}
pub fn from_json(v: &Value) -> Result<Bindings, Error> {
match v.as_object() {
Some(modules) => Self::parse_modules_json_obj(modules),
None => Err(format_err!("top level json expected to be object"))?,
}
}
pub fn from_str(s: &str) -> Result<Bindings, Error> {
let top: Value = serde_json::from_str(s)?;
Ok(Self::from_json(&top)?)
}
pub fn from_file<P: AsRef<Path>>(path: P) -> Result<Bindings, Error> {
let contents = fs::read_to_string(path.as_ref())?;
Ok(Self::from_str(&contents)?)
}
pub fn extend(&mut self, other: &Bindings) -> Result<(), Error> {
for (modname, othermodbindings) in other.bindings.iter() {
match self.bindings.entry(modname.clone()) {
Entry::Occupied(mut e) => {
let existing = e.get_mut();
for (bindname, binding) in othermodbindings {
match existing.entry(bindname.clone()) {
Entry::Vacant(e) => {
e.insert(binding.clone());
}
Entry::Occupied(e) => {
if binding != e.get() {
Err(format_err!(
"cannot re-bind {} from {} to {}",
e.key(),
binding,
e.get()
))?;
}
}
}
}
}
Entry::Vacant(e) => {
e.insert(othermodbindings.clone());
}
}
}
Ok(())
}
pub fn translate(&self, module: &str, symbol: &str) -> Result<&str, Error> {
match self.bindings.get(module) {
Some(m) => match m.get(symbol) {
Some(s) => Ok(s),
None => Err(format_err!("Unknown symbol `{}::{}`", module, symbol)),
},
None => Err(format_err!(
"Unknown module for symbol `{}::{}`",
module,
symbol
)),
}
}
fn parse_modules_json_obj(m: &Map<String, Value>) -> Result<Self, Error> {
let mut res = HashMap::new();
for (modulename, values) in m {
match values.as_object() {
Some(methods) => {
let methodmap = Self::parse_methods_json_obj(methods)?;
res.insert(modulename.to_owned(), methodmap);
}
None => Err(format_err!(""))?,
}
}
Ok(Self::new(res))
}
fn parse_methods_json_obj(m: &Map<String, Value>) -> Result<HashMap<String, String>, Error> {
let mut res = HashMap::new();
for (method, i) in m {
match i.as_str() {
Some(importbinding) => {
res.insert(method.to_owned(), importbinding.to_owned());
}
None => Err(format_err!(""))?,
}
}
Ok(res)
}
pub fn to_string(&self) -> Result<String, Error> {
let s = serde_json::to_string(&self.to_json())?;
Ok(s)
}
pub fn to_json(&self) -> Value {
Value::from(self.serialize_modules_json_obj())
}
fn serialize_modules_json_obj(&self) -> Map<String, Value> {
let mut m = Map::new();
for (modulename, values) in self.bindings.iter() {
m.insert(
modulename.to_owned(),
Value::from(Self::serialize_methods_json_obj(values)),
);
}
m
}
fn serialize_methods_json_obj(methods: &HashMap<String, String>) -> Map<String, Value> {
let mut m = Map::new();
for (methodname, symbol) in methods.iter() {
m.insert(methodname.to_owned(), Value::from(symbol.to_owned()));
}
m
}
}
#[cfg(test)]
mod tests {
fn test_file(f: &str) -> PathBuf {
PathBuf::from(format!("tests/bindings/{}", f))
}
use super::Bindings;
use std::collections::HashMap;
use std::path::PathBuf;
#[test]
fn explicit() {
let mut explicit_map = HashMap::new();
explicit_map.insert(String::from("hello"), String::from("goodbye"));
let map = Bindings::env(explicit_map);
let result = map.translate("env", "hello").unwrap();
assert!(result == "goodbye");
let result = map.translate("env", "nonexistent");
if let Ok(_) = result {
assert!(
false,
"explicit import map returned value for non-existent symbol"
)
}
}
#[test]
fn explicit_from_nonexistent_file() {
let fail_map = Bindings::from_file(&test_file("nonexistent_bindings.json"));
assert!(
fail_map.is_err(),
"ImportMap::explicit_from_file did not fail on a non-existent file"
);
}
#[test]
fn explicit_from_garbage_file() {
let fail_map = Bindings::from_file(&test_file("garbage.json"));
assert!(
fail_map.is_err(),
"ImportMap::explicit_from_file did not fail on a garbage file"
);
}
#[test]
fn explicit_from_file() {
let map = Bindings::from_file(&test_file("bindings_test.json"))
.expect("load valid bindings from file");
let result = map.translate("env", "hello").expect("hello has a binding");
assert!(result == "json is cool");
assert!(
map.translate("env", "nonexistent").is_err(),
"bindings from file returned value for non-existent symbol"
);
}
}
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