first commit

.gitignore

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+/target
+**/*.rs.bk

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "aho-corasick"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "clifmt"
+version = "0.1.0"
+dependencies = [
+ "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "memchr"
+version = "2.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "regex"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "aho-corasick 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "thread_local"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[metadata]
+"checksum aho-corasick 0.7.6 (registry+https://github.com/rust-lang/crates.io-index)" = "58fb5e95d83b38284460a5fda7d6470aa0b8844d283a0b614b8535e880800d2d"
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+"checksum memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "88579771288728879b57485cc7d6b07d648c9f0141eb955f8ab7f9d45394468e"
+"checksum regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dc220bd33bdce8f093101afe22a037b8eb0e5af33592e6a9caafff0d4cb81cbd"
+"checksum regex-syntax 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)" = "11a7e20d1cce64ef2fed88b66d347f88bd9babb82845b2b858f3edbf59a4f716"
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Cargo.toml

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+[package]
+name = "clifmt"
+version = "0.1.0"
+authors = ["xdrm-brackets <xdrm.brackets.dev@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+regex = "1"

src/transform/errors.rs

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+use std::fmt;
+
+pub struct Error {
+	kind: Kind,
+}
+
+impl fmt::Debug for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&self.kind, f)
+    }
+}
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Debug::fmt(&self.kind, f)
+    }
+}
+
+pub fn new(kind: Kind) -> Error {
+	Error { kind }
+}
+
+pub enum Kind {
+	InvalidFormat,
+}
+
+impl fmt::Debug for Kind {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		match self {
+        	Kind::InvalidFormat => fmt::Debug::fmt("invalid format", f),
+		}
+    }
+}
+impl fmt::Display for Kind {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		match self {
+        	Kind::InvalidFormat => fmt::Debug::fmt("invalid format", f),
+		}
+    }
+}

src/transform/mod.rs

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+use regex;
+
+pub mod errors;
+pub mod registry;
+
+pub struct Transformer {
+	// the regex matching text to replace
+	pub matcher: regex::Regex,
+
+	// transform is called to replace a match by its transformation
+	// it takes as arguments the matched string chunks from the regex
+	pub transform: fn(&regex::Captures) -> Option<String>
+}
+
+impl Transformer {
+	// execute 1 given transformer @t with its @input string and returns the output,
+	// and the error if one.
+	fn execute(&self, input: &mut String) -> Option<errors::Error> {
+		let mut cursor = 0;
+		let original = input.to_owned();
+
+		// reset input as we have @original
+		input.clear();
+
+		// apply transformatione for each match
+		for re_match in self.matcher.find_iter(&original) {
+
+			// 1. append gap between input start OR previous match
+			input.push_str( &original[cursor..re_match.start()] );
+			cursor = re_match.end();
+
+			// 2. execute transformation on captures
+			for re_captures in self.matcher.captures(re_match.as_str()) {
+
+				if let Some(transformed) = (self.transform)(&re_captures) {
+					// 3. apply transformation
+					input.push_str(&transformed);
+				}
+
+			}
+
+		}
+
+		// add end of input (if not covered by matches)
+		if cursor < original.len() {
+			input.push_str( &original[cursor..] );
+		}
+
+		return None;
+	}
+}
+
+

src/transform/registry.rs

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+use crate::transform::Transformer;
+use crate::transform::errors;
+use std::vec;
+
+pub fn new() -> Registry {
+	Registry {
+		transformers: vec!(),
+	}
+}
+
+// used to apply a stack of transformations on an input string
+pub struct Registry {
+	// Transformers represents the transformer stack
+	// ; each one will be executed in ascending order
+	transformers: vec::Vec<Transformer>
+}
+
+
+impl Registry {
+
+	pub fn add(&mut self, transformer: Transformer) {
+		self.transformers.push(transformer);
+	}
+
+	// transform executes each transformer of the stack in ascending order feeding
+	// each one with the output of its predecessor (@input for the first). Note that if one returns an error
+	// the process stops here and the error is directly returned.
+	pub fn transform(&self, input: &String) -> Result<String, errors::Error> {
+		let mut transformed = input.to_owned();
+
+		// execute each transformer by order
+		for transformer in self.transformers.iter() {
+
+			// execute ; dispatch error on failure
+			if let Some(err) = transformer.execute(&mut transformed) {
+				return Err(err);
+			}
+
+		}
+
+		Result::Ok( String::from(transformed) )
+	}
+
+}