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|
//! This module implements the serialisation of derivations into the
//! [ATerm][] format used by C++ Nix.
//!
//! [ATerm]: http://program-transformation.org/Tools/ATermFormat.html
use crate::output::Output;
use crate::string_escape::escape_string;
use std::collections::BTreeSet;
use std::{collections::BTreeMap, fmt, fmt::Write};
pub const DERIVATION_PREFIX: &str = "Derive";
pub const PAREN_OPEN: char = '(';
pub const PAREN_CLOSE: char = ')';
pub const BRACKET_OPEN: char = '[';
pub const BRACKET_CLOSE: char = ']';
pub const COMMA: char = ',';
pub const QUOTE: char = '"';
pub const COLON: &str = ":";
pub const TEXT_COLON: &str = "text:";
pub const SHA256_COLON: &str = "sha256:";
pub const DOT_FILE_EXT: &str = ".drv";
fn write_array_elements(
writer: &mut impl Write,
quote: bool,
open: &str,
closing: &str,
elements: Vec<&str>,
) -> Result<(), fmt::Error> {
writer.write_str(open)?;
for (index, element) in elements.iter().enumerate() {
if index > 0 {
writer.write_char(COMMA)?;
}
if quote {
writer.write_char(QUOTE)?;
}
writer.write_str(element)?;
if quote {
writer.write_char(QUOTE)?;
}
}
writer.write_str(closing)?;
Ok(())
}
pub fn write_outputs(
writer: &mut impl Write,
outputs: &BTreeMap<String, Output>,
) -> Result<(), fmt::Error> {
writer.write_char(BRACKET_OPEN)?;
for (ii, (output_name, output)) in outputs.iter().enumerate() {
if ii > 0 {
writer.write_char(COMMA)?;
}
let mut elements: Vec<&str> = vec![output_name, &output.path];
match &output.hash {
Some(hash) => {
elements.push(&hash.algo);
elements.push(&hash.digest);
}
None => {
elements.push("");
elements.push("");
}
}
write_array_elements(
writer,
true,
&PAREN_OPEN.to_string(),
&PAREN_CLOSE.to_string(),
elements,
)?
}
writer.write_char(BRACKET_CLOSE)?;
Ok(())
}
pub fn write_input_derivations(
writer: &mut impl Write,
input_derivations: &BTreeMap<String, BTreeSet<String>>,
) -> Result<(), fmt::Error> {
writer.write_char(COMMA)?;
writer.write_char(BRACKET_OPEN)?;
for (ii, (input_derivation_path, input_derivation)) in input_derivations.iter().enumerate() {
if ii > 0 {
writer.write_char(COMMA)?;
}
writer.write_char(PAREN_OPEN)?;
writer.write_char(QUOTE)?;
writer.write_str(input_derivation_path.as_str())?;
writer.write_char(QUOTE)?;
writer.write_char(COMMA)?;
write_array_elements(
writer,
true,
&BRACKET_OPEN.to_string(),
&BRACKET_CLOSE.to_string(),
input_derivation.iter().map(|s| &**s).collect(),
)?;
writer.write_char(PAREN_CLOSE)?;
}
writer.write_char(BRACKET_CLOSE)?;
Ok(())
}
pub fn write_input_sources(
writer: &mut impl Write,
input_sources: &BTreeSet<String>,
) -> Result<(), fmt::Error> {
writer.write_char(COMMA)?;
write_array_elements(
writer,
true,
&BRACKET_OPEN.to_string(),
&BRACKET_CLOSE.to_string(),
input_sources.iter().map(|s| &**s).collect(),
)?;
Ok(())
}
pub fn write_system(writer: &mut impl Write, platform: &str) -> Result<(), fmt::Error> {
writer.write_char(COMMA)?;
writer.write_str(escape_string(platform).as_str())?;
Ok(())
}
pub fn write_builder(writer: &mut impl Write, builder: &str) -> Result<(), fmt::Error> {
writer.write_char(COMMA)?;
writer.write_str(escape_string(builder).as_str())?;
Ok(())
}
pub fn write_arguments(writer: &mut impl Write, arguments: &[String]) -> Result<(), fmt::Error> {
writer.write_char(COMMA)?;
write_array_elements(
writer,
true,
&BRACKET_OPEN.to_string(),
&BRACKET_CLOSE.to_string(),
arguments.iter().map(|s| &**s).collect(),
)?;
Ok(())
}
pub fn write_enviroment(
writer: &mut impl Write,
environment: &BTreeMap<String, String>,
) -> Result<(), fmt::Error> {
writer.write_char(COMMA)?;
writer.write_char(BRACKET_OPEN)?;
for (ii, (key, environment)) in environment.iter().enumerate() {
if ii > 0 {
writer.write_char(COMMA)?;
}
write_array_elements(
writer,
false,
&PAREN_OPEN.to_string(),
&PAREN_CLOSE.to_string(),
vec![&escape_string(key), &escape_string(environment)],
)?;
}
writer.write_char(BRACKET_CLOSE)?;
Ok(())
}
|
