whitespace:ws = [ \b\f\r\t\v];

comment-line:alias = "#" [^\n]*;
comment            = comment-line ("\n" comment-line)*;

quoted:alias:nows   = "\"" ([^\\"] | "\\" .)* "\"";
word:alias:nows     = ([^\\"\n=#.\[\] \b\f\r\t\v] | "\\" .)+;
symbol              = word+ | quoted;

key-form:alias = symbol | symbol ("." symbol)+;
key            = key-form;

group-key-form:alias = "[" key-form "]";
group-key            = (comment "\n")? group-key-form | group-key-form;

value-chars:alias:nows = ([^\\"\n=# \b\f\r\t\v] | "\\" .)+;
value                  = value-chars+ | quoted;

key-val     = (comment "\n")? (key | key? "=" value?) comment-line?;
entry:alias = group-key | key-val;
doc:root    = (entry | comment-line | "\n")*;