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basic_escape_char = @{ "\\\\" | "\\'" }
escape_char = @{ "\\" ~ ANY }
bareword_char = @{
escape_char |
!("|" | ";" | "\"" | "'" | "$" | WHITESPACE | COMMENT) ~ ANY
}
single_string_char = @{ basic_escape_char | (!"'" ~ ANY) }
double_string_char = @{ escape_char | (!"\"" ~ ANY) }
var = @{
("$" ~ XID_START ~ XID_CONTINUE*) |
("$" ~ ("?" | "$" | "*" | ASCII_DIGIT)) |
("${" ~ (!"}" ~ ANY)+ ~ "}")
}
redir_prefix = @{
("in" | "out" | "err" | ASCII_DIGIT*) ~ (">>" | ">" | "<") ~ WHITESPACE*
}
bareword = @{ bareword_char+ }
single_string = @{ single_string_char+ }
double_string = @{ double_string_char+ }
word = ${
redir_prefix? ~
(var | bareword |
"'" ~ single_string ~ "'" |
"\"" ~ (var | double_string)+ ~ "\"")+
}
exe = ${ word ~ (w ~ word)* }
list = ${ word ~ (w ~ word)* }
pipeline = ${ exe ~ (w? ~ "|" ~ w? ~ exe)* }
control_if = ${ "if" ~ w ~ pipeline }
control_while = ${ "while" ~ w ~ pipeline }
control_for = ${ "for" ~ w ~ bareword ~ w ~ "in" ~ w ~ list }
control_end = ${ "end" }
control = ${ control_if | control_while | control_for | control_end }
command = ${ control | pipeline }
commands = ${ command ~ (w? ~ ";" ~ w? ~ command)* }
line = ${ SOI ~ w? ~ commands ~ w? ~ EOI }
w = _{ (WHITESPACE | COMMENT)+ }
WHITESPACE = _{ (" " | "\t" | "\n") }
COMMENT = _{ "#" ~ ANY* }
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