opt|:
  - val: ""
  - val: "<0>"
opt||:
  - val: ""
  - val: "<0>"
    freq: "<1>"

optref|:
  - val: ""
  - val: "{<0>}"
optref||:
  - val: ""
  - val: "{<0>}"
    freq: "<1>"

lb:
  - val: "{{"
rb:
  - val: "}}"
bs:
  - val: '\\'

or|...:
  - val: "<0>"
  - val: "{or|<...>}"
    freq: "<len(...)>"
or||:
  - val: "<0>"
  - val: "<1>"
or|||:
  - val: "<0>"
  - val: "<1>"
  - val: "<2>"
or||||:
  - val: "<0>"
  - val: "<1>"
  - val: "<2>"
  - val: "<3>"

or||||||||...:
  - val: "{or|<0>|<1>|<2>|<3>}"
    freq: 4
  - val: "{or|<4>|<5>|<6>|<7>}"
    freq: 4
  - val: "{or|<...>}"
    freq: "<len(...)>"

new-line:
  - val: "\n"

identifier:
  - val: "{alpha}"
    freq: "<d>"
  - val: "{identifier}{alpha}"
  - val: "{identifier}{digit}"
alpha:
  - val: "{or|a|b|c|d|e|f|g|h|i|j|k|l|m}"
  - val: "{or|n|o|p|q|r|s|t|u|v|w|x|y|z}"
  - val: "{or|A|B|C|D|E|F|G|H|I|J|K|L|M}"
  - val: "{or|N|O|P|Q|R|S|T|U|V|W|X|Y|Z}"
  - val: "_"
    freq: .0769231

int:
  - val: "{dec-number}"
  - val: "0x{hex-number}"
    freq: .1
float:
  - val: "{opt|-|.5}{float1}"
    freq: 4
  - val: "{opt|-|.5}{float1}e{sign}{dec-number}"
  - val: "{opt|-|.5}{float1}E{sign}{dec-number}"
float1:
  - val: "{dec-number}"
  - val: ".{dec-number}"
  - val: "{dec-number}."
  - val: "{dec-number}.{dec-number}"
dec-number:
  - val: "{digit}"
  - val: "{dec-number}{digit}"
hex-number:
  - val: "{hexadecimal-digit}"
  - val: "{hex-number}{hexadecimal-digit}"

digit:
  - val: "{or|0|1|2|3|4|5|6|7}"
    freq: 4
  - val: "{or|8|9}"
hexadecimal-digit:
  - val: "{or|0|1|2|3|4|5|6|7|8|9}"
    freq: 20
  - val: "{or|a|b|c|d|e|f}"
    freq: 6
  - val: "{or|A|B|C|D|E|F}"
    freq: 6
octal-digit:
  - val: "{digit!0}"
sign:
  - val: "+"
  - val: "-"

punct-char:
  - val: '{or|_|[|]|#|%|;|.|?|*}'
    freq: 9
  - val: '{or|+|-|/|^|&|~|=|,}'
    freq: 8
  - val: '{{'
  - val: '}}'
  - val: "("
  - val: ")"
  - val: ":"
  - val: "!"
  - val: "<b>"
  - val: "|"
basic-char:
  - val: "{alpha}"
    freq: 50
  - val: "{digit}"
    freq: 20
  - val: "{punct-char}"
  - val: '<lt>'
  - val: '<gt>'
  - val: '"'
  - val: "'"
noescape_char:
  - val: "{basic-char!0 1 2 3 4}"

string-literal:
  - val: "\"{optref|s-char-sequence}\""

s-char-sequence:
  - val: "{s-char}"
    freq: "</(#d|2)>"
  - val: "{s-char-sequence}{s-char}"
s-char:
  - val: "{noescape_char}"
    freq: 70
  - val: "'"
  - val: "{escape-sequence}"
    freq: .5
  - val: "{universal-character-name}"
    freq: .1

character-literal:
  - val: "'{c-char}'"

c-char-sequence:
  - val: "{c-char}"
    freq: 10
  - val: "{c-char-sequence}{c-char}"
c-char:
  - val: "{noescape_char}"
    freq: 70
  - val: '"'
  - val: "{escape-sequence}"
    freq: .5
  - val: "{universal-character-name}"
    freq: .1
escape-sequence:
  - val: "{simple-escape-sequence}"
  - val: "{octal-escape-sequence}"
  - val: "{hexadecimal-escape-sequence}"
simple-escape-sequence:
  - val: "{bs}'"
  - val: '{bs}"'
  - val: '{bs}{bs}'
  - val: '{bs}a'
  - val: '{bs}b'
  - val: '{bs}f'
  - val: '{bs}n'
  - val: '{bs}r'
  - val: '{bs}t'
  - val: '{bs}v'
octal-escape-sequence:
  - val: "{bs}{octal-digit}"
  - val: "{bs}{octal-digit}{octal-digit}"
  - val: "{bs}{octal-digit}{octal-digit}{octal-digit}"
hexadecimal-escape-sequence:
  - val: '{bs}x{hexadecimal-digit}'
  - val: "{bs}x{hexadecimal-digit}{hexadecimal-digit}"

universal-character-name:
  - val: '\\u{hex-quad}'
  - val: '\\U{hex-quad}{hex-quad}'
hex-quad:
  - val: "{hexadecimal-digit}{hexadecimal-digit}{hexadecimal-digit}\
{hexadecimal-digit}"

str:
  - val: "{string-literal}"
    freq: 4
  - val: "{character-literal}"

expression:
  - val: "{identifier}"
  - val: "{int}"
  - val: "{float}"
  - val: "{str}"
expression|:
  - val: "{identifier}"
  - val: "{<0>}"
expression-list:
  - val: ""
  - val: "{expression}"
  - val: "{expression}, {expression-list-1}"
expression-list-1:
  - val: "{expression}"
  - val: "{expression}, {expression-list-1}"
expression-list|:
  - val: ""
  - val: "{expression|<0>}"
  - val: "{expression|<0>}, {expression-list-1|<0>}"
expression-list-1|:
  - val: "{expression|<0>}"
  - val: "{expression|<0>}, {expression-list-1|<0>}"
ref-expression:
  - val: "&{identifier}"

array-expression:
  - val: "[{expression-list|int}]"
  - val: "[{expression-list|float}]"
  - val: "[{expression-list|str}]"

variable-decl:
  - val: "let {opt|mut |.5}{identifier} = {expression}"
    freq: 4
  - val: "let {opt|mut |.5}{identifier} = {array-expression}"
  - val: "let mut {identifier} : {owner-type}{type-specifier}"
  - val: "let {opt|mut |.5}{identifier} : {owner-type}{type-specifier} {lb}{expression-list}{rb}"
  - val: "let {opt|mut |.5}{identifier} : {owner-type}{typed-initializer}"

typed-initializer:
  - val: "{type-specifier|int|0} = {expression|int}"
  - val: "{type-specifier|float|0} = {expression|float}"
  - val: "{type-specifier|str|0} = {expression|str}"
  
  - val: "{type-specifier|int|1} = {ref-expression}"
  - val: "{type-specifier|float|1} = {ref-expression}"
  - val: "{type-specifier|str|1} = {ref-expression}"
  
  - val: "[{int}]{type-specifier|int|0} = [{expression-list|int:0}]"
  - val: "[{int}]{type-specifier|float|0} = [{expression-list|float:0}]"
  - val: "[{int}]{type-specifier|str|0} = [{expression-list|str:0}]"
  - val: "[]{type-specifier|int|0} = [{expression-list|int}]"
  - val: "[]{type-specifier|float|0} = [{expression-list|float}]"
  - val: "[]{type-specifier|str|0} = [{expression-list|str}]"

owner-type:
  - val: ""
  - val: "owner "
  - val: "shared "

type-specifier:
  - val: "{type-specifier|int|0}"
  - val: "{type-specifier|float|0}"
  - val: "{type-specifier|str|0}"
type-specifier||:
  - val: "<0>"
  - val: "&{opt| }{type-specifier-2|<0>|<1>}"
    freq: "<1>"
type-specifier-2||:
  - val: "{type-specifier|<0>|<1>}"
    freq: 3
  - val: "mut {type-specifier|<0>|<1>}"
  - val: "[{optref|int}]{type-specifier-2|<0>|<1>}"
  - val: ""