lib_xch 0.13.0

Crate xch-ceb's official lib
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

WHITESPACE = _{ " " }
COMMENT = _{ "/*" ~ (!"*/" ~ ANY)* ~ "*/" }
// base
lalpha = { 'a'..'z' }
ualpha = { 'A'..'Z' }
digit = { '0'..'9' }
num = @{ digit+ }

// atom
atom_name = @{ ualpha ~ (lalpha*) }
atom = { atom_name ~ (num?) }

// electron
sign = { "+" | "-" }
electron = { "<" ~ (num?) ~ "e" ~ sign ~ ">" }

// parenthesis wrapper
parenthesis_wrapper = { "(" ~ (molecule_group) ~ ")" ~ (num?) }

// molecule and its group
molecule = { (num?) ~ ((atom | parenthesis_wrapper)+) ~ (electron?) }
molecule_group = { molecule ~ (("." ~ molecule)*) }

// main
exp = { molecule_group ~ (("+" ~ molecule_group)*) }
equ = _{ SOI ~ exp ~ "=" ~ exp ~ EOI }