regex: remove old regex-syntax crate

This commit does the mechanical changes necessary to remove the old
regex-syntax crate and replace it with the rewrite. The rewrite now
subsumes the `regex-syntax` crate name, and gets a semver bump to 0.5.0.

Author: BurntSushi

Diff for: Cargo.toml

@@ -19,7 +19,7 @@ appveyor = { repository = "rust-lang-libs/regex" }
 
 [workspace]
 members = [
-  "bench", "regex-capi", "regex-debug", "regex-syntax", "regex-syntax-2",
+  "bench", "regex-capi", "regex-debug", "regex-syntax",
 ]
 
 [dependencies]
@@ -30,8 +30,7 @@ memchr = "2.0.0"
 # For managing regex caches quickly across multiple threads.
 thread_local = "0.3.2"
 # For parsing regular expressions.
-regex-syntax = { path = "regex-syntax", version = "0.4.1" }
-regex-syntax2 = { path = "regex-syntax-2", version = "0.5.0" }
+regex-syntax = { path = "regex-syntax", version = "0.5.0" }
 # For accelerating text search.
 simd = { version = "0.2.1", optional = true }
 # For compiling UTF-8 decoding into automata.

Diff for: bench/Cargo.toml

@@ -19,7 +19,7 @@ onig = { version = "3", optional = true }
 libpcre-sys = { version = "0.2", optional = true }
 memmap = "0.6"
 regex = { version = "0.2.0", path = "..", features = ["simd-accel"] }
-regex-syntax = { version = "0.4.0", path = "../regex-syntax" }
+regex-syntax = { version = "0.5.0", path = "../regex-syntax" }
 serde = "1"
 serde_derive = "1"
 

Diff for: bench/src/rust_compile.rs

@@ -8,23 +8,23 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use regex_syntax::Expr;
+use regex_syntax::Parser;
 use test::Bencher;
 
 use regex::internal::Compiler;
 
 #[bench]
 fn compile_simple(b: &mut Bencher) {
     b.iter(|| {
-        let re = Expr::parse(r"^bc(d|e)*$").unwrap();
+        let re = Parser::new().parse(r"^bc(d|e)*$").unwrap();
         Compiler::new().compile(&[re]).unwrap()
     });
 }
 
 #[bench]
 fn compile_simple_bytes(b: &mut Bencher) {
     b.iter(|| {
-        let re = Expr::parse(r"^bc(d|e)*$").unwrap();
+        let re = Parser::new().parse(r"^bc(d|e)*$").unwrap();
         Compiler::new().bytes(true).compile(&[re]).unwrap()
     });
 }
@@ -39,15 +39,15 @@ fn compile_simple_full(b: &mut Bencher) {
 #[bench]
 fn compile_small(b: &mut Bencher) {
     b.iter(|| {
-        let re = Expr::parse(r"\p{L}|\p{N}|\s|.|\d").unwrap();
+        let re = Parser::new().parse(r"\p{L}|\p{N}|\s|.|\d").unwrap();
         Compiler::new().compile(&[re]).unwrap()
     });
 }
 
 #[bench]
 fn compile_small_bytes(b: &mut Bencher) {
     b.iter(|| {
-        let re = Expr::parse(r"\p{L}|\p{N}|\s|.|\d").unwrap();
+        let re = Parser::new().parse(r"\p{L}|\p{N}|\s|.|\d").unwrap();
         Compiler::new().bytes(true).compile(&[re]).unwrap()
     });
 }
@@ -62,15 +62,15 @@ fn compile_small_full(b: &mut Bencher) {
 #[bench]
 fn compile_huge(b: &mut Bencher) {
     b.iter(|| {
-        let re = Expr::parse(r"\p{L}{100}").unwrap();
+        let re = Parser::new().parse(r"\p{L}{100}").unwrap();
         Compiler::new().compile(&[re]).unwrap()
     });
 }
 
 #[bench]
 fn compile_huge_bytes(b: &mut Bencher) {
     b.iter(|| {
-        let re = Expr::parse(r"\p{L}{100}").unwrap();
+        let re = Parser::new().parse(r"\p{L}{100}").unwrap();
         Compiler::new().bytes(true).compile(&[re]).unwrap()
     });
 }

Diff for: regex-debug/Cargo.toml

@@ -13,8 +13,7 @@ workspace = ".."
 [dependencies]
 docopt = "0.8"
 regex = { version = "0.2", path = ".." }
-regex-syntax = { version = "0.4.0", path = "../regex-syntax" }
-regex-syntax2 = { version = "0.5.0", path = "../regex-syntax-2" }
+regex-syntax = { version = "0.5.0", path = "../regex-syntax" }
 serde = "1"
 serde_derive = "1"
 utf8-ranges = "1"

Diff for: regex-debug/src/main.rs

@@ -1,6 +1,6 @@
 extern crate docopt;
 extern crate regex;
-extern crate regex_syntax2 as syntax;
+extern crate regex_syntax as syntax;
 extern crate serde;
 #[macro_use]
 extern crate serde_derive;