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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /vendor/pest_meta/src/optimizer/concatenator.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/pest_meta/src/optimizer/concatenator.rs')
-rw-r--r-- | vendor/pest_meta/src/optimizer/concatenator.rs | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/vendor/pest_meta/src/optimizer/concatenator.rs b/vendor/pest_meta/src/optimizer/concatenator.rs new file mode 100644 index 000000000..e0aab7bc1 --- /dev/null +++ b/vendor/pest_meta/src/optimizer/concatenator.rs @@ -0,0 +1,34 @@ +// pest. The Elegant Parser +// Copyright (c) 2018 DragoČ™ Tiselice +// +// Licensed under the Apache License, Version 2.0 +// <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0> or the MIT +// license <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your +// option. All files in the project carrying such notice may not be copied, +// modified, or distributed except according to those terms. + +use ast::*; + +pub fn concatenate(rule: Rule) -> Rule { + match rule { + Rule { name, ty, expr } => Rule { + name, + ty, + expr: expr.map_bottom_up(|expr| { + if ty == RuleType::Atomic { + // TODO: Use box syntax when it gets stabilized. + match expr { + Expr::Seq(lhs, rhs) => match (*lhs, *rhs) { + (Expr::Str(lhs), Expr::Str(rhs)) => Expr::Str(lhs + &rhs), + (Expr::Insens(lhs), Expr::Insens(rhs)) => Expr::Insens(lhs + &rhs), + (lhs, rhs) => Expr::Seq(Box::new(lhs), Box::new(rhs)), + }, + expr => expr, + } + } else { + expr + } + }), + }, + } +} |