Proof of concept of launching Minecraft from Rust

theseus/src/launcher/rules.rs

@@ -0,0 +1,52 @@
+use crate::launcher::download::get_os;
+use crate::launcher::meta::{OsRule, Rule, RuleAction};
+use regex::Regex;
+
+pub fn parse_rules(rules: &[Rule]) -> bool {
+    rules.iter().all(|x| parse_rule(x))
+}
+
+pub fn parse_rule(rule: &Rule) -> bool {
+    let result = if let Some(os) = &rule.os {
+        parse_os_rule(os)
+    } else if let Some(feature) = &rule.feature {
+        false
+    } else {
+        true
+    };
+
+    return match rule.action {
+        RuleAction::Allow => result,
+        RuleAction::Disallow => !result,
+    };
+}
+
+pub fn parse_os_rule(rule: &OsRule) -> bool {
+    if let Some(arch) = &rule.arch {
+        match arch.as_str() {
+            "x86" => {
+                #[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
+                return false;
+            }
+            "arm" => {
+                #[cfg(not(target_arch = "arm"))]
+                return false;
+            }
+            _ => {}
+        }
+    }
+
+    if let Some(name) = &rule.name {
+        if &get_os() != name {
+            return false;
+        }
+    }
+    if let Some(version) = &rule.version {
+        let regex = Regex::new(version.as_str()).unwrap();
+        if !regex.is_match(&*sys_info::os_release().unwrap()) {
+            return false;
+        }
+    }
+
+    true
+}