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use super::json_pointer::JsonPointer;
use json_value_resolve::Resolve;
use regex::Regex;
use serde_json::Value;
const MUSTACHE_PATTERN: &str = "\\{{2}[^}]*\\}{2}";
/// Trait used to apply actions on an object with mustache pattern.
pub trait Mustache {
/// Check if the object has mustache pattern.
fn has_mustache(&self) -> bool;
/// Replace mustache pattern by an object value.
fn replace_mustache(&mut self, object: Value);
}
impl Mustache for String {
/// Test if the string contain mustache pattern.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
/// use chewdata::helper::mustache::Mustache;
///
/// let mustache_string = "my value: {{ field }}".to_string();
/// assert_eq!(true, mustache_string.has_mustache());
/// let mustache_string = "my value".to_string();
/// assert_eq!(false, mustache_string.has_mustache());
/// ```
fn has_mustache(&self) -> bool {
let reg = Regex::new(MUSTACHE_PATTERN).unwrap();
reg.is_match(self.as_ref())
}
/// Replace mustache variables by the value
///
/// # Examples
///
/// ```
/// use serde_json::Value;
/// use json_value_merge::Merge;
/// use chewdata::helper::mustache::Mustache;
///
/// let mut path = "my_path/{{ field_1 }}/{{ field_2 }}".to_string();
///
/// let mut parameters = Value::default();
/// parameters.merge_in("/field_1", &Value::String("var_1".to_string())).unwrap();
/// parameters.merge_in("/field_2", &Value::String("var_2".to_string())).unwrap();
///
/// path.replace_mustache(parameters);
///
/// assert_eq!("my_path/var_1/var_2", path.as_str());
/// ```
fn replace_mustache(&mut self, object: Value) {
let mut resolved_path = self.to_owned();
if let Value::Null = object {
return;
}
let regex = Regex::new("\\{{2}([^}]*)\\}{2}").unwrap();
for captured in regex.captures_iter(self.as_ref()) {
let pattern_captured = captured[0].to_string();
let value_captured = captured[1].trim().to_string();
let json_pointer = value_captured.to_string().to_json_pointer();
let var: String = match object.pointer(&json_pointer) {
Some(Value::Null) => "null".to_string(),
Some(Value::String(string)) => string.to_string(),
Some(Value::Number(number)) => format!("{}", number),
Some(Value::Bool(boolean)) => format!("{}", boolean),
Some(Value::Array(vec)) => Value::Array(vec.clone()).to_string(),
Some(Value::Object(map)) => Value::Object(map.clone()).to_string(),
None => {
trace!(
"This value '{}' can't be resolved for this path '{}' and this object '{}'",
value_captured,
json_pointer,
format!("{:?}", object),
);
continue;
}
};
resolved_path = resolved_path.replace(pattern_captured.as_str(), var.as_str());
}
*self = resolved_path;
}
}
impl Mustache for Value {
/// Test if the object contain mustache pattern.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
/// use chewdata::helper::mustache::Mustache;
///
/// let value_1: Value = serde_json::from_str(r#"{"field":"{{ field_1 }}"}"#).unwrap();
/// let value_2: Value = serde_json::from_str(r#"{"field":"value_2"}"#).unwrap();
///
/// assert_eq!(true, value_1.has_mustache());
/// assert_eq!(false, value_2.has_mustache());
/// ```
fn has_mustache(&self) -> bool {
value_has_mustache(self)
}
/// Replace mustache variable into a json value object.
///
/// # Examples
///
/// ```
/// use serde_json::Value;
/// use json_value_merge::Merge;
/// use chewdata::helper::mustache::Mustache;
///
/// let mut value: Value = serde_json::from_str(r#"{"field":"{{ field_1 }}"}"#).unwrap();
///
/// let mut parameters = Value::default();
/// parameters.merge_in("/field_1", &Value::String("var_1".to_string())).unwrap();
/// parameters.merge_in("/field_2", &Value::String("var_2".to_string())).unwrap();
///
/// value.replace_mustache(parameters);
///
/// assert_eq!(r#"{"field":"var_1"}"#, value.to_string().as_str());
/// ```
fn replace_mustache(&mut self, object: Value) {
value_replace_mustache(self, &object);
}
}
fn value_has_mustache(value: &Value) -> bool {
match value {
Value::Object(a) => {
for (_k, v) in a {
if value_has_mustache(v) {
return true;
}
}
false
}
Value::Array(a) => {
for i in a {
if value_has_mustache(i) {
return true;
}
}
false
}
Value::String(a) => a.has_mustache(),
_ => false,
}
}
fn value_replace_mustache(value: &mut Value, object: &Value) {
match *value {
Value::Object(ref mut a) => {
for (_k, v) in a {
value_replace_mustache(v, object);
}
}
Value::Array(ref mut a) => {
for i in a {
value_replace_mustache(i, object);
}
}
Value::String(ref mut a) => {
if a.has_mustache() {
a.replace_mustache(object.clone());
*value = Value::resolve(a.clone());
}
}
_ => (),
}
}
#[cfg(test)]
mod tests {
use json_value_merge::Merge;
use super::*;
#[test]
fn string_has_mustache() {
let mustache_string = "my value: {{ field }}".to_string();
assert_eq!(true, mustache_string.has_mustache());
let mustache_string = "my value".to_string();
assert_eq!(false, mustache_string.has_mustache());
}
#[test]
fn string_replace_mustache() {
let mustache_string = "my value: {{ field }}".to_string();
assert_eq!(true, mustache_string.has_mustache());
let mustache_string = "my value".to_string();
assert_eq!(false, mustache_string.has_mustache());
}
#[test]
fn string_replace_mustache_not_found_pattern() {
let mut path = "my_path/{{ field_1 }}".to_string();
let mut parameters = Value::default();
parameters
.merge_in("/field_2", &Value::String("var_2".to_string()))
.unwrap();
path.replace_mustache(parameters);
assert_eq!("my_path/{{ field_1 }}", path.as_str());
}
#[test]
fn value_has_mustache() {
let value_1: Value = serde_json::from_str(r#"{"field":"{{ field_1 }}"}"#).unwrap();
let value_2: Value = serde_json::from_str(r#"{"field":"value_2"}"#).unwrap();
assert_eq!(true, value_1.has_mustache());
assert_eq!(false, value_2.has_mustache());
}
#[test]
fn value_replace_mustache() {
let mut value: Value = serde_json::from_str(r#"{"field":"{{ field_1 }}"}"#).unwrap();
let mut parameters = Value::default();
parameters
.merge_in("/field_1", &Value::String("var_1".to_string()))
.unwrap();
parameters
.merge_in("/field_2", &Value::String("var_2".to_string()))
.unwrap();
value.replace_mustache(parameters);
assert_eq!(r#"{"field":"var_1"}"#, value.to_string().as_str());
let mut value: Value =
serde_json::from_str(r#"{"number":"{{ number }}","bool":"{{ bool }}"}"#).unwrap();
let mut parameters = Value::default();
parameters
.merge_in("/number", &serde_json::from_str("10").unwrap())
.unwrap();
parameters
.merge_in("/bool", &serde_json::from_str("true").unwrap())
.unwrap();
value.replace_mustache(parameters);
assert_eq!(r#"{"number":10,"bool":true}"#, value.to_string().as_str());
}
}