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|
use serde::{Deserialize, Serialize};
use std::{collections::BTreeMap, fmt, fmt::Write};
#[cfg(test)]
mod tests;
const DERIVATION_PREFIX: &str = "Derive";
const PAREN_OPEN: char = '(';
const PAREN_CLOSE: char = ')';
const BRACKET_OPEN: char = '[';
const BRACKET_CLOSE: char = ']';
const COMMA: char = ',';
const QUOTE: char = '"';
const STRING_ESCAPER: [(char, &str); 5] = [
('\\', "\\\\"),
('\n', "\\n"),
('\r', "\\r"),
('\t', "\\t"),
('\"', "\\\""),
];
fn default_resource() -> String {
"".to_string()
}
#[derive(Serialize, Deserialize)]
pub struct Output {
path: String,
#[serde(default = "default_resource")]
hash_algorithm: String,
#[serde(default = "default_resource")]
hash: String,
}
#[derive(Serialize, Deserialize)]
pub struct Derivation {
outputs: BTreeMap<String, Output>,
input_sources: Vec<String>,
input_derivations: BTreeMap<String, Vec<String>>,
platform: String,
builder: String,
arguments: Vec<String>,
environment: BTreeMap<String, String>,
}
fn escape_string(s: &String) -> String {
let mut s_replaced = s.clone();
for escape_sequence in STRING_ESCAPER {
s_replaced = s_replaced.replace(escape_sequence.0, escape_sequence.1);
}
return format!("\"{}\"", s_replaced);
}
fn write_array_elements(
writer: &mut impl Write,
quote: bool,
open: &str,
closing: &str,
elements: Vec<&String>,
) -> 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)?;
return Ok(());
}
pub fn serialize_derivation(
derivation: Derivation,
writer: &mut impl Write,
) -> Result<(), fmt::Error> {
writer.write_str(DERIVATION_PREFIX)?;
writer.write_char(PAREN_OPEN)?;
// Step 1: Write outputs
{
writer.write_char(BRACKET_OPEN)?;
for (ii, (output_name, output)) in derivation.outputs.iter().enumerate() {
if ii > 0 {
writer.write_char(COMMA)?;
}
// TODO(jrhahn) option to strip output
let elements = vec![
output_name,
&output.path,
&output.hash_algorithm,
&output.hash,
];
write_array_elements(
writer,
true,
&PAREN_OPEN.to_string(),
&PAREN_CLOSE.to_string(),
elements,
)?
}
writer.write_char(BRACKET_CLOSE)?;
}
// Step 2: Write input_derivations
{
writer.write_char(COMMA)?;
writer.write_char(BRACKET_OPEN)?;
for (ii, (input_derivation_path, input_derivation)) in
derivation.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)?;
}
// Step 3: Write input_sources
{
writer.write_char(COMMA)?;
write_array_elements(
writer,
true,
&BRACKET_OPEN.to_string(),
&BRACKET_CLOSE.to_string(),
derivation.input_sources.iter().map(|s| s).collect(),
)?;
}
// Step 4: Write platform
{
writer.write_char(COMMA)?;
writer.write_str(&escape_string(&derivation.platform).as_str())?;
}
// Step 5: Write builder
{
writer.write_char(COMMA)?;
writer.write_str(&escape_string(&derivation.builder).as_str())?;
}
// Step 6: Write arguments
{
writer.write_char(COMMA)?;
write_array_elements(
writer,
true,
&BRACKET_OPEN.to_string(),
&BRACKET_CLOSE.to_string(),
derivation.arguments.iter().map(|s| s).collect(),
)?;
}
// Step 7: Write env
{
writer.write_char(COMMA)?;
writer.write_char(BRACKET_OPEN)?;
for (ii, (key, environment)) in derivation.environment.iter().enumerate() {
if ii > 0 {
writer.write_char(COMMA)?;
}
// TODO(jrhahn) add strip option
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)?;
}
// Step 8: Close Derive call
writer.write_char(PAREN_CLOSE)?;
return Ok(());
}
|
