the mode mini parser

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

crates/format/src/case.rs

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+use serde::Deserialize;
+
+use crate::modes::Mode;
+
+#[derive(Debug, Deserialize)]
+pub struct Case {
+    #[serde(rename(deserialize = "modes"))]
+    pub modes: Vec<Mode>,
+}

crates/format/src/lib.rs

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+//! The revive differential tests case format.
+
+pub mod case;
+pub mod modes;

crates/format/src/modes.rs

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+use serde::Deserialize;
+use serde::de::Deserializer;
+
+/// Specifies the compilation mode of the test artifact.
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub enum Mode {
+    Solidity(SolcMode),
+    Unknown(String),
+}
+
+/// Specify Solidity specific compiler options.
+#[derive(Debug, Default, Clone, Eq, PartialEq)]
+pub struct SolcMode {
+    pub solc_version: Option<semver::VersionReq>,
+    pub solc_optimize: Option<bool>,
+    pub llvm_optimizer_settings: Vec<String>,
+}
+
+impl SolcMode {
+    /// Try to parse a mode string into a solc mode.
+    /// Returns `None` if the string wasn't a solc YUL mode string.
+    ///
+    /// The mode string is expected to start with the `Y` ID (YUL ID),
+    /// optionally followed by `+` or `-` for the solc optimizer settings.
+    ///
+    /// Options can be separated by a whitespace contain the following
+    /// - A solc `SemVer version requirement` string
+    /// - One or more `-OX` where X is a supposed to be an LLVM opt mode
+    pub fn parse_from_mode_string(mode_string: &str) -> Option<Self> {
+        let mut result = Self::default();
+
+        let mut parts = mode_string.trim().split(" ");
+
+        match parts.next()? {
+            "Y" => {}
+            "Y+" => result.solc_optimize = Some(true),
+            "Y-" => result.solc_optimize = Some(false),
+            _ => return None,
+        }
+
+        while let Some(part) = parts.next() {
+            if let Ok(solc_version) = semver::VersionReq::parse(part) {
+                result.solc_version = Some(solc_version);
+                continue;
+            }
+            if part.starts_with("-O") {
+                result.llvm_optimizer_settings.push(part[2..].to_string());
+                continue;
+            }
+            panic!("the YUL mode string {mode_string} failed to parse, invalid part: {part}")
+        }
+
+        Some(result)
+    }
+}
+
+impl<'de> Deserialize<'de> for Mode {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let mode_string = String::deserialize(deserializer)?;
+
+        if let Some(solc_mode) = SolcMode::parse_from_mode_string(&mode_string) {
+            return Ok(Self::Solidity(solc_mode));
+        }
+
+        Ok(Self::Unknown(mode_string))
+    }
+}