Initial commit

.gitignore

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+/target
+Cargo.lock

Cargo.toml

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+[package]
+name = "cssifier"
+version = "0.1.0"
+authors = ["kirbylife <gabriel13m@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+regex = "1.0"

src/lib.rs

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+use regex::Regex;
+
+fn cssifier(xpath: &'static str) -> Option<String> {
+    let reg = Regex::new(r#"(?P<node>(^id\(["']?(?P<idvalue>\s*[\w/:][-/\w\s,:;.]*)["']?\)|(?P<nav>//?)(?P<tag>([a-zA-Z][a-zA-Z0-9]{0,10}|\*))(\[((?P<matched>(?P<mattr>@?[.a-zA-Z_:][-\w:.]*(\(\))?)=["'](?P<mvalue>\s*[\w/:][-/\w\s,:;.]*))["']|(?P<contained>contains\((?P<cattr>@?[.a-zA-Z_:][-\w:.]*(\(\))?),\s*["'](?P<cvalue>\s*[\w/:][-/\w\s,:;.]*)["']\)))\])?(\[(?P<nth>\d)\])?))"#).unwrap();
+    let mut css = String::new();
+    let mut position = 0;
+
+    while position < xpath.len() {
+        let node = reg.captures(&xpath[position..])?;
+        let find = reg.find(&xpath[position..])?;
+
+        let nav = match position {
+            0 => "",
+            _ => {
+                if node.name("nav")?.as_str() != "//" {
+                    " "
+                } else {
+                    " > "
+                }
+            }
+        };
+
+        let tag = if node.name("tag")?.as_str() == "*" {
+            ""
+        } else {
+            match node.name("tag") {
+                Some(tag) => tag.as_str(),
+                _ => "",
+            }
+        };
+
+        let attr = if node.name("idvalue").is_some() {
+            format!("#{}", node.name("idvalue")?.as_str().replace(" ", "#"))
+        } else if node.name("matched").is_some() {
+            let mattr = node.name("mattr")?.as_str();
+            let mvalue = node.name("mvalue")?.as_str();
+
+            if mattr == "@id" {
+                format!("#{}", mvalue.replace(" ", "#"))
+            } else if mattr == "@class" {
+                format!(".{}", mvalue.replace(" ", "."))
+            } else if mattr == "text()" || mattr == "." {
+                format!(":contains(^{}$)", mvalue)
+            } else {
+                String::from("")
+            }
+        } else {
+            String::from("")
+        };
+        css = format!("{}{}{}{}", css, nav, tag, attr);
+        position += find.end();
+    }
+
+    Some(css)
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::cssifier;
+
+    #[test]
+    fn it_works() {
+        assert_eq!(cssifier("//a/b").unwrap(), "a b");
+        assert_eq!(cssifier("//a/b[@id='hello']").unwrap(), "a b#hello");
+    }
+}