# Syntax definitions for some Lua-specific patterns
#
# NOTE: this is *NOT* intended to be a complete definition of the language's
# syntax! Providing a full language grammar is overkill, because the intended
# use case is finding/replacing string patterns. This task does not require a
# full parse tree, and having one makes the task considerably more complicated.
# See the accompanying README.md for more info.

comment: "--" (`[ @eqs=*`= `[ ..%\n (`]eqs`]) / ..$)
string: `"..%string-escape `" / `' ..%string-escape `' / `[ @eqs=*`= `[ ..%\n (`]eqs`])
table: `{ ..%(table/string/comment/\n) `}
keyword: ("and" / "break" / "do" / "else" / "elseif" / "end" / "false" / "for" /
    "function" / "goto" / "if" / "in" / "local" / "nil" / "not" / "or" /
    "repeat" / "return" / "then" / "true" / "until" / "while")
function-def: |"function"|[_id (*(`.id)[`:id])]_ parens
block: function / if-block / while-block / for-block / repeat-block / do-block
repeat-block: |"repeat"| ..%(comment/string/\n) (|"until"|)
do-block: |"do"| ..%(comment/string/block/\n) (|"end"|)
for-block: |"for"| ..%\n >(|"do"|) do-block
while-block: |"while"| ..%\n >(|"do"|) do-block
if-block: |"if"| ..%\n |"then"| ..%(comment/string/\n) (|"end"|)
function: function-def ..%(comment/string/block/\n) (|"end"|)