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absinthe

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GraphQL for Elixir

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absinthe src absinthe_lexer.xrl
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src/absinthe_lexer.xrl 

% Absinthe Lexer

%

% See the spec reference http://facebook.github.io/graphql/#sec-Appendix-Grammar-Summary

% The relevant version is also copied into this repo



Definitions.



% Ignored tokens

WhiteSpace          = [\x{0009}\x{000B}\x{000C}\x{0020}\x{00A0}]

_LineTerminator     = \x{000A}\x{000D}\x{2028}\x{2029}

LineTerminator      = [{_LineTerminator}]

Comment             = #[^{_LineTerminator}]*

Comma               = ,

Ignored             = {WhiteSpace}|{LineTerminator}|{Comment}|{Comma}



% Lexical tokens

Punctuator          = [!$():=@\[\]{|}]|\.\.\.

Name                = [_A-Za-z][_0-9A-Za-z]*



% Int Value

Digit               = [0-9]

NonZeroDigit        = [1-9]

NegativeSign        = -

IntegerPart         = {NegativeSign}?(0|{NonZeroDigit}{Digit}*)

IntValue            = {IntegerPart}



% Float Value

FractionalPart      = \.{Digit}+

Sign                = [+\-]

ExponentIndicator   = [eE]

ExponentPart        = {ExponentIndicator}{Sign}?{Digit}+

FloatValue          = {IntegerPart}{FractionalPart}|{IntegerPart}{ExponentPart}|{IntegerPart}{FractionalPart}{ExponentPart}



% String Value

HexDigit            = [0-9A-Fa-f]

EscapedUnicode      = u{HexDigit}{HexDigit}{HexDigit}{HexDigit}

EscapedCharacter    = ["\\\/bfnrt]

StringCharacter     = ([^\"{_LineTerminator}]|\\{EscapedUnicode}|\\{EscapedCharacter})

StringValue         = "{StringCharacter}*"



% Boolean Value

BooleanValue        = true|false



% Reserved words

ReservedWord        = query|mutation|fragment|on|type|implements|interface|union|scalar|enum|input|extend|null



Rules.



{Ignored}           : skip_token.

{Punctuator}        : {token, {list_to_atom(TokenChars), TokenLine}}.

{ReservedWord}      : {token, {list_to_atom(TokenChars), TokenLine}}.

{IntValue}          : {token, {int_value, TokenLine, TokenChars}}.

{FloatValue}        : {token, {float_value, TokenLine, TokenChars}}.

{StringValue}       : {token, {string_value, TokenLine, TokenChars}}.

{BooleanValue}      : {token, {boolean_value, TokenLine, TokenChars}}.

{Name}              : {token, {name, TokenLine, TokenChars}}.



Erlang code.