github/semantic
1
1
Fork 0
mirror of https://github.com/github/semantic.git synced 2024-12-24 15:35:14 +03:00
Code Issues Projects Releases Wiki Activity

🔥 some ill-advised pseudo-properties.

Browse Source
This commit is contained in:
Rob Rix 2018-03-16 16:29:56 -04:00
parent 5fc81f8566
commit d54b6b812b
1 changed files with 1 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/Assigning/Assignment.hs
View File

@ -36,9 +36,7 @@
-- --
-- Assignments can represent alternatives as either committed or uncommitted choices, both written with '<|>'. “Committed” in this context means that a failure in one of the alternatives will not result in backtracking followed by an attempt of one of the other alternatives; thus, committed choice is more efficient. (By the same token, it enables much better error messages since backtracking erases most of the relevant context.) Committed choices are constructed via the following rules: -- Assignments can represent alternatives as either committed or uncommitted choices, both written with '<|>'. “Committed” in this context means that a failure in one of the alternatives will not result in backtracking followed by an attempt of one of the other alternatives; thus, committed choice is more efficient. (By the same token, it enables much better error messages since backtracking erases most of the relevant context.) Committed choices are constructed via the following rules:
-- --
-- 1. 'empty' is dropped from choices: -- 1. 'empty' is dropped from choices.
-- prop> empty <|> a = a -- empty is the left-identity of <|>
-- prop> a <|> empty = a -- empty is the right-identity of <|>
-- --
-- 2. 'symbol' rules construct a committed choice (with only a single alternative). -- 2. 'symbol' rules construct a committed choice (with only a single alternative).
-- --