factor out solc JSON interface crate (#264)

The differential testing framework will make a second consumer. There
seems to be no re-usable Rust crate for this. But we already have
everything here, just needs a small refactor to make it fully re-usable.

- Mostly decouple the solc JSON-input-output interface types from the
`solidity` frontend crate
- Expose the JSON-input-output interface types in a dedicated crate

---------

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>

crates/solidity/src/project/mod.rs

@@ -9,6 +9,7 @@ use std::path::Path;
 
 #[cfg(feature = "parallel")]
 use rayon::iter::{IntoParallelIterator, ParallelIterator};
+use revive_solc_json_interface::SolcStandardJsonOutput;
 use serde::Deserialize;
 use serde::Serialize;
 use sha3::Digest;
@@ -243,6 +244,69 @@ impl Project {
             BTreeMap::new(),
         ))
     }
+
+    /// Converts the `solc` JSON output into a convenient project.
+    pub fn try_from_standard_json_output(
+        output: &SolcStandardJsonOutput,
+        source_code_files: BTreeMap<String, String>,
+        libraries: BTreeMap<String, BTreeMap<String, String>>,
+        solc_version: &SolcVersion,
+        debug_config: &revive_llvm_context::DebugConfig,
+    ) -> anyhow::Result<Self> {
+        let files = match output.contracts.as_ref() {
+            Some(files) => files,
+            None => match &output.errors {
+                Some(errors) if errors.iter().any(|e| e.severity == "error") => {
+                    anyhow::bail!(serde_json::to_string_pretty(errors).expect("Always valid"));
+                }
+                _ => &BTreeMap::new(),
+            },
+        };
+        let mut project_contracts = BTreeMap::new();
+
+        for (path, contracts) in files.iter() {
+            for (name, contract) in contracts.iter() {
+                let full_path = format!("{path}:{name}");
+
+                let ir_optimized = match contract.ir_optimized.to_owned() {
+                    Some(ir_optimized) => ir_optimized,
+                    None => continue,
+                };
+                if ir_optimized.is_empty() {
+                    continue;
+                }
+
+                debug_config.dump_yul(full_path.as_str(), ir_optimized.as_str())?;
+
+                let mut lexer = Lexer::new(ir_optimized.to_owned());
+                let object = Object::parse(&mut lexer, None).map_err(|error| {
+                    anyhow::anyhow!("Contract `{}` parsing error: {:?}", full_path, error)
+                })?;
+
+                let source = IR::new_yul(ir_optimized.to_owned(), object);
+
+                let source_code = source_code_files
+                    .get(path.as_str())
+                    .ok_or_else(|| anyhow::anyhow!("Source code for path `{}` not found", path))?;
+                let source_hash = sha3::Keccak256::digest(source_code.as_bytes()).into();
+
+                let project_contract = Contract::new(
+                    full_path.clone(),
+                    source_hash,
+                    solc_version.to_owned(),
+                    source,
+                    contract.metadata.to_owned(),
+                );
+                project_contracts.insert(full_path, project_contract);
+            }
+        }
+
+        Ok(Project::new(
+            solc_version.to_owned(),
+            project_contracts,
+            libraries,
+        ))
+    }
 }
 
 impl revive_llvm_context::PolkaVMDependency for Project {