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lexer.rl
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lexer.rl
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%%{
machine graphql_lexer;
IDENTIFIER = [_A-Za-z][_0-9A-Za-z]*;
NEWLINE = [\c\r\n];
BLANK = [, \t]+;
COMMENT = '#' [^\n\r]*;
INT = '-'? ('0'|[1-9][0-9]*);
FLOAT_DECIMAL = '.'[0-9]+;
FLOAT_EXP = ('e' | 'E')?('+' | '-')?[0-9]+;
FLOAT = INT FLOAT_DECIMAL? FLOAT_EXP?;
ON = 'on';
FRAGMENT = 'fragment';
TRUE = 'true';
FALSE = 'false';
NULL = 'null';
QUERY = 'query';
MUTATION = 'mutation';
SUBSCRIPTION = 'subscription';
SCHEMA = 'schema';
SCALAR = 'scalar';
TYPE = 'type';
IMPLEMENTS = 'implements';
INTERFACE = 'interface';
UNION = 'union';
ENUM = 'enum';
INPUT = 'input';
DIRECTIVE = 'directive';
LCURLY = '{';
RCURLY = '}';
LPAREN = '(';
RPAREN = ')';
LBRACKET = '[';
RBRACKET = ']';
COLON = ':';
QUOTE = '"';
ESCAPED_QUOTE = '\\"';
STRING_CHAR = (ESCAPED_QUOTE | ^'"');
VAR_SIGN = '$';
DIR_SIGN = '@';
ELLIPSIS = '...';
EQUALS = '=';
BANG = '!';
PIPE = '|';
QUOTED_STRING = QUOTE STRING_CHAR* QUOTE;
# catch-all for anything else. must be at the bottom for precedence.
UNKNOWN_CHAR = /./;
main := |*
INT => { emit(:INT, ts, te, meta) };
FLOAT => { emit(:FLOAT, ts, te, meta) };
ON => { emit(:ON, ts, te, meta) };
FRAGMENT => { emit(:FRAGMENT, ts, te, meta) };
TRUE => { emit(:TRUE, ts, te, meta) };
FALSE => { emit(:FALSE, ts, te, meta) };
NULL => { emit(:NULL, ts, te, meta) };
QUERY => { emit(:QUERY, ts, te, meta) };
MUTATION => { emit(:MUTATION, ts, te, meta) };
SUBSCRIPTION => { emit(:SUBSCRIPTION, ts, te, meta) };
SCHEMA => { emit(:SCHEMA, ts, te, meta) };
SCALAR => { emit(:SCALAR, ts, te, meta) };
TYPE => { emit(:TYPE, ts, te, meta) };
IMPLEMENTS => { emit(:IMPLEMENTS, ts, te, meta) };
INTERFACE => { emit(:INTERFACE, ts, te, meta) };
UNION => { emit(:UNION, ts, te, meta) };
ENUM => { emit(:ENUM, ts, te, meta) };
INPUT => { emit(:INPUT, ts, te, meta) };
DIRECTIVE => { emit(:DIRECTIVE, ts, te, meta) };
RCURLY => { emit(:RCURLY, ts, te, meta) };
LCURLY => { emit(:LCURLY, ts, te, meta) };
RPAREN => { emit(:RPAREN, ts, te, meta) };
LPAREN => { emit(:LPAREN, ts, te, meta) };
RBRACKET => { emit(:RBRACKET, ts, te, meta) };
LBRACKET => { emit(:LBRACKET, ts, te, meta) };
COLON => { emit(:COLON, ts, te, meta) };
QUOTED_STRING => { emit_string(ts + 1, te - 1, meta) };
VAR_SIGN => { emit(:VAR_SIGN, ts, te, meta) };
DIR_SIGN => { emit(:DIR_SIGN, ts, te, meta) };
ELLIPSIS => { emit(:ELLIPSIS, ts, te, meta) };
EQUALS => { emit(:EQUALS, ts, te, meta) };
BANG => { emit(:BANG, ts, te, meta) };
PIPE => { emit(:PIPE, ts, te, meta) };
IDENTIFIER => { emit(:IDENTIFIER, ts, te, meta) };
COMMENT => { record_comment(ts, te, meta) };
NEWLINE => {
meta[:line] += 1
meta[:col] = 1
};
BLANK => { meta[:col] += te - ts };
UNKNOWN_CHAR => { emit(:UNKNOWN_CHAR, ts, te, meta) };
*|;
}%%
module GraphQL
module Language
module Lexer
def self.tokenize(query_string)
run_lexer(query_string)
end
# Replace any escaped unicode or whitespace with the _actual_ characters
# To avoid allocating more strings, this modifies the string passed into it
def self.replace_escaped_characters_in_place(raw_string)
raw_string.gsub!(ESCAPES, ESCAPES_REPLACE)
raw_string.gsub!(UTF_8, &UTF_8_REPLACE)
nil
end
private
%% write data;
def self.run_lexer(query_string)
data = query_string.unpack("c*")
eof = data.length
# Since `Lexer` is a module, store all lexer state
# in this local variable:
meta = {
line: 1,
col: 1,
data: data,
tokens: [],
previous_token: nil,
}
p ||= 0
pe ||= data.length
%% write init;
%% write exec;
meta[:tokens]
end
def self.record_comment(ts, te, meta)
token = GraphQL::Language::Token.new(
name: :COMMENT,
value: meta[:data][ts...te].pack(PACK_DIRECTIVE).force_encoding(UTF_8_ENCODING),
line: meta[:line],
col: meta[:col],
prev_token: meta[:previous_token],
)
meta[:previous_token] = token
meta[:col] += te - ts
end
def self.emit(token_name, ts, te, meta)
meta[:tokens] << token = GraphQL::Language::Token.new(
name: token_name,
value: meta[:data][ts...te].pack(PACK_DIRECTIVE).force_encoding(UTF_8_ENCODING),
line: meta[:line],
col: meta[:col],
prev_token: meta[:previous_token],
)
meta[:previous_token] = token
# Bump the column counter for the next token
meta[:col] += te - ts
end
ESCAPES = /\\["\\\/bfnrt]/
ESCAPES_REPLACE = {
'\\"' => '"',
"\\\\" => "\\",
"\\/" => '/',
"\\b" => "\b",
"\\f" => "\f",
"\\n" => "\n",
"\\r" => "\r",
"\\t" => "\t",
}
UTF_8 = /\\u[\dAa-f]{4}/i
UTF_8_REPLACE = ->(m) { [m[-4..-1].to_i(16)].pack('U'.freeze) }
VALID_STRING = /\A(?:[^\\]|#{ESCAPES}|#{UTF_8})*\z/o
PACK_DIRECTIVE = "c*"
UTF_8_ENCODING = "UTF-8"
def self.emit_string(ts, te, meta)
value = meta[:data][ts...te].pack(PACK_DIRECTIVE).force_encoding(UTF_8_ENCODING)
if value !~ VALID_STRING
meta[:tokens] << token = GraphQL::Language::Token.new(
name: :BAD_UNICODE_ESCAPE,
value: value,
line: meta[:line],
col: meta[:col],
prev_token: meta[:previous_token],
)
else
replace_escaped_characters_in_place(value)
meta[:tokens] << token = GraphQL::Language::Token.new(
name: :STRING,
value: value,
line: meta[:line],
col: meta[:col],
prev_token: meta[:previous_token],
)
end
meta[:previous_token] = token
meta[:col] += te - ts
end
end
end
end