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use crate::config::errors::ConfigError;
use crate::config::parser::*;
use miette::{SourceOffset, SourceSpan};
use serde::de::DeserializeOwned;
pub use crate::format::Format;
fn create_span(content: &str, line: usize, column: usize) -> SourceSpan {
let offset = SourceOffset::from_location(content, line, column).offset();
let length = 0;
(offset, length).into()
}
impl Format {
/// Detects a format from a provided value, either a file path or URL, by
/// checking for a supported file extension.
pub fn detect(value: &str) -> Result<Format, ConfigError> {
let mut available: Vec<&str> = vec![];
#[cfg(feature = "json")]
{
available.push("JSON");
if value.ends_with(".json") {
return Ok(Format::Json);
}
}
#[cfg(feature = "toml")]
{
available.push("TOML");
if value.ends_with(".toml") {
return Ok(Format::Toml);
}
}
#[cfg(feature = "yaml")]
{
available.push("YAML");
if value.ends_with(".yaml") || value.ends_with(".yml") {
return Ok(Format::Yaml);
}
}
Err(ConfigError::UnsupportedFormat(
value.to_owned(),
available.join(", "),
))
}
/// Parse the provided content in the defined format into a partial configuration struct.
/// On failure, will attempt to extract the path to the problematic field and source
/// code spans (for use in `miette`).
pub fn parse<D>(&self, content: String, _location: &str) -> Result<D, ParserError>
where
D: DeserializeOwned,
{
let data: D = match self {
Format::None => {
unreachable!();
}
#[cfg(feature = "json")]
Format::Json => {
let content = if content.is_empty() {
"{}".to_owned()
} else {
content
};
let de = &mut serde_json::Deserializer::from_str(&content);
serde_path_to_error::deserialize(de).map_err(|error| ParserError {
// content: NamedSource::new(location, content.to_owned()),
content: content.to_owned(),
path: error.path().to_string(),
span: Some(create_span(
&content,
error.inner().line(),
error.inner().column(),
)),
message: error.inner().to_string(),
})?
}
#[cfg(feature = "toml")]
Format::Toml => {
let de = toml::Deserializer::new(&content);
serde_path_to_error::deserialize(de).map_err(|error| ParserError {
// content: NamedSource::new(location, content.to_owned()),
content: content.to_owned(),
path: error.path().to_string(),
span: error.inner().span().map(|s| s.into()),
message: error.inner().message().to_owned(),
})?
}
#[cfg(feature = "yaml")]
Format::Yaml => {
use serde::de::IntoDeserializer;
// First pass, convert string to value
let de = serde_yaml::Deserializer::from_str(&content);
let mut result: serde_yaml::Value =
serde_path_to_error::deserialize(de).map_err(|error| ParserError {
// content: NamedSource::new(location, content.to_owned()),
content: content.to_owned(),
path: error.path().to_string(),
span: error
.inner()
.location()
.map(|s| create_span(&content, s.line(), s.column())),
message: error.inner().to_string(),
})?;
// Applies anchors/aliases/references
result.apply_merge().map_err(|error| ParserError {
// content: NamedSource::new(location, content.to_owned()),
content: content.to_owned(),
path: String::new(),
span: error.location().map(|s| (s.line(), s.column()).into()),
message: error.to_string(),
})?;
// Second pass, convert value to struct
let de = result.into_deserializer();
serde_path_to_error::deserialize(de).map_err(|error| ParserError {
// content: NamedSource::new(location, content.to_owned()),
content: content.to_owned(),
path: error.path().to_string(),
span: error
.inner()
.location()
.map(|s| create_span(&content, s.line(), s.column())),
message: error.inner().to_string(),
})?
}
};
Ok(data)
}
}