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use std::env;
use std::ffi::OsString;
use std::path::PathBuf;
use anyhow::{Context, Result};
#[derive(Debug)]
pub struct Contract {
/// Absolute path to the directory in which the contract is located on disk
directory: PathBuf,
/// Whether the contract is imported from "node_modules" or not
external: bool,
/// Name of the contract file
file_name: OsString,
/// Absolute path to the contract on disk
full_path: PathBuf,
/// Source code of the Solidity contract
source_code: String,
}
impl Contract {
pub fn directory(&self) -> &PathBuf {
&self.directory
}
pub fn external(&self) -> bool {
self.external
}
pub fn file_name(&self) -> &OsString {
&self.file_name
}
pub fn full_path(&self) -> &PathBuf {
&self.full_path
}
pub fn source_code(&self) -> &str {
&self.source_code
}
}
impl Contract {
pub fn set_source_code(&mut self, source_code: String) {
self.source_code = source_code;
}
}
impl Contract {
pub fn new(
directory: PathBuf,
external: bool,
file_name: OsString,
full_path: PathBuf,
source_code: String,
) -> Contract {
Contract {
directory,
external,
file_name,
full_path,
source_code,
}
}
/// Generates the struct instance starting from the user provided path to the contract.
pub fn from_cli(contract_path: &PathBuf) -> Result<Contract> {
let full_path = contract_path
.canonicalize()
.with_context(|| "Couldn't get an absolute path to the contract path")?;
// Get the curent working directory by "popping" the file name out of the path.
let mut directory = PathBuf::from(&full_path);
directory.pop();
// Gets the file name out of the path provided by the user. It is safe to unwrap because the
// contract path is sanity checked on program entry.
let file_name = contract_path.file_name().unwrap().to_os_string();
let contract = Contract {
directory,
file_name,
external: false,
full_path,
source_code: String::from(""),
};
Ok(contract)
}
/// Generates the struct instance starting from import path captured in another contract.
pub fn from_import_path(ancestor_contract: &Contract, import_path: &PathBuf) -> Result<Contract> {
let external: bool;
let full_path: PathBuf;
// Safe to unwrap because the regex can't match a path ending in "..".
let file_name = import_path.file_name().unwrap().to_os_string();
// If the path starts with "." or "..", the import is local. Otherwise, the paths are constructed as if
// the contract was defined in "node_modules" in the current working directory.
if import_path.starts_with(".") || import_path.starts_with("..") {
// The contract could be external even if the import isn't relative. That's because one of the ancestors
// may be external.
external = ancestor_contract.external;
// Join the ancestor contract's directory with the current import path to the full path.
full_path = ancestor_contract
.directory()
.join(import_path)
.canonicalize()
.with_context(|| format!("Couldn't get an absolute path to the contract: {:?}", file_name))?;
} else {
// The contract must be external if the import isn't relative. Lest the Solidity program wouldn't compile.
external = true;
// Construct the path assuming that "node_modules" is in the current working directory.
let cwd = env::current_dir().unwrap();
let cwd_str = cwd.as_os_str().to_str().unwrap();
let import_path_str = import_path.to_str().unwrap();
full_path = [cwd_str, "node_modules", import_path_str].iter().collect();
}
// Get the curent working directory by popping the file name out of the path.
let mut directory: PathBuf;
directory = PathBuf::from(&full_path);
directory.pop();
let contract = Contract {
directory,
external,
file_name,
full_path,
source_code: String::from(""),
};
Ok(contract)
}
}