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lexer.rl
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lexer.rl
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%%{
machine graphql_c_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 = INT ('.'[0-9]+) (('e' | 'E')?('+' | '-')?[0-9]+)?;
ON = 'on';
FRAGMENT = 'fragment';
TRUE_LITERAL = 'true';
FALSE_LITERAL = 'false';
NULL_LITERAL = 'null';
QUERY = 'query';
MUTATION = 'mutation';
SUBSCRIPTION = 'subscription';
SCHEMA = 'schema';
SCALAR = 'scalar';
TYPE_LITERAL = 'type';
EXTEND = 'extend';
IMPLEMENTS = 'implements';
INTERFACE = 'interface';
UNION = 'union';
ENUM = 'enum';
INPUT = 'input';
DIRECTIVE = 'directive';
REPEATABLE = 'repeatable';
LCURLY = '{';
RCURLY = '}';
LPAREN = '(';
RPAREN = ')';
LBRACKET = '[';
RBRACKET = ']';
COLON = ':';
# Could limit to hex here, but “bad unicode escape” on 0XXF is probably a
# more helpful error than “unknown char”
UNICODE_ESCAPE = "\\u" ([0-9A-Za-z]{4} | LCURLY [0-9A-Za-z]{4,} RCURLY);
VAR_SIGN = '$';
DIR_SIGN = '@';
ELLIPSIS = '...';
EQUALS = '=';
BANG = '!';
PIPE = '|';
AMP = '&';
QUOTED_STRING = ('"' ((('\\"' | ^'"') - "\\" - "\n" - "\r") | UNICODE_ESCAPE | '\\' [\\/bfnrt])* '"');
# catch-all for anything else. must be at the bottom for precedence.
UNKNOWN_CHAR = /./;
BLOCK_STRING = ('"""' ('\\"""' | ^'"' | '"'{1,2} ^'"')* '"'{0,2} '"""');
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_LITERAL => { emit(TRUE_LITERAL, ts, te, meta); };
FALSE_LITERAL => { emit(FALSE_LITERAL, ts, te, meta); };
NULL_LITERAL => { emit(NULL_LITERAL, 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_LITERAL => { emit(TYPE_LITERAL, ts, te, meta); };
EXTEND => { emit(EXTEND, 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); };
REPEATABLE => { emit(REPEATABLE, 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); };
BLOCK_STRING => { emit(BLOCK_STRING, ts, te, meta); };
QUOTED_STRING => { emit(QUOTED_STRING, ts, te, 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); };
AMP => { emit(AMP, ts, te, meta); };
IDENTIFIER => { emit(IDENTIFIER, ts, te, meta); };
COMMENT => { emit(COMMENT, ts, te, meta); };
NEWLINE => {
meta->line += 1;
meta->col = 1;
meta->preceeded_by_number = 0;
};
BLANK => {
meta->col += te - ts;
meta->preceeded_by_number = 0;
};
UNKNOWN_CHAR => { emit(UNKNOWN_CHAR, ts, te, meta); };
*|;
}%%
%% write data;
#include <ruby.h>
#include <ruby/encoding.h>
#define INIT_STATIC_TOKEN_VARIABLE(token_name) \
static VALUE GraphQLTokenString##token_name;
INIT_STATIC_TOKEN_VARIABLE(ON)
INIT_STATIC_TOKEN_VARIABLE(FRAGMENT)
INIT_STATIC_TOKEN_VARIABLE(QUERY)
INIT_STATIC_TOKEN_VARIABLE(MUTATION)
INIT_STATIC_TOKEN_VARIABLE(SUBSCRIPTION)
INIT_STATIC_TOKEN_VARIABLE(REPEATABLE)
INIT_STATIC_TOKEN_VARIABLE(RCURLY)
INIT_STATIC_TOKEN_VARIABLE(LCURLY)
INIT_STATIC_TOKEN_VARIABLE(RBRACKET)
INIT_STATIC_TOKEN_VARIABLE(LBRACKET)
INIT_STATIC_TOKEN_VARIABLE(RPAREN)
INIT_STATIC_TOKEN_VARIABLE(LPAREN)
INIT_STATIC_TOKEN_VARIABLE(COLON)
INIT_STATIC_TOKEN_VARIABLE(VAR_SIGN)
INIT_STATIC_TOKEN_VARIABLE(DIR_SIGN)
INIT_STATIC_TOKEN_VARIABLE(ELLIPSIS)
INIT_STATIC_TOKEN_VARIABLE(EQUALS)
INIT_STATIC_TOKEN_VARIABLE(BANG)
INIT_STATIC_TOKEN_VARIABLE(PIPE)
INIT_STATIC_TOKEN_VARIABLE(AMP)
INIT_STATIC_TOKEN_VARIABLE(SCHEMA)
INIT_STATIC_TOKEN_VARIABLE(SCALAR)
INIT_STATIC_TOKEN_VARIABLE(EXTEND)
INIT_STATIC_TOKEN_VARIABLE(IMPLEMENTS)
INIT_STATIC_TOKEN_VARIABLE(INTERFACE)
INIT_STATIC_TOKEN_VARIABLE(UNION)
INIT_STATIC_TOKEN_VARIABLE(ENUM)
INIT_STATIC_TOKEN_VARIABLE(DIRECTIVE)
INIT_STATIC_TOKEN_VARIABLE(INPUT)
static VALUE GraphQL_type_str;
static VALUE GraphQL_true_str;
static VALUE GraphQL_false_str;
static VALUE GraphQL_null_str;
typedef enum TokenType {
AMP,
BANG,
COLON,
DIRECTIVE,
DIR_SIGN,
ENUM,
ELLIPSIS,
EQUALS,
EXTEND,
FALSE_LITERAL,
FLOAT,
FRAGMENT,
IDENTIFIER,
INPUT,
IMPLEMENTS,
INT,
INTERFACE,
LBRACKET,
LCURLY,
LPAREN,
MUTATION,
NULL_LITERAL,
ON,
PIPE,
QUERY,
RBRACKET,
RCURLY,
REPEATABLE,
RPAREN,
SCALAR,
SCHEMA,
STRING,
SUBSCRIPTION,
TRUE_LITERAL,
TYPE_LITERAL,
UNION,
VAR_SIGN,
BLOCK_STRING,
QUOTED_STRING,
UNKNOWN_CHAR,
COMMENT,
BAD_UNICODE_ESCAPE
} TokenType;
typedef struct Meta {
int line;
int col;
char *query_cstr;
char *pe;
VALUE tokens;
VALUE previous_token;
int dedup_identifiers;
int reject_numbers_followed_by_names;
int preceeded_by_number;
int max_tokens;
int tokens_count;
} Meta;
#define STATIC_VALUE_TOKEN(token_type, content_str) \
case token_type: \
token_sym = ID2SYM(rb_intern(#token_type)); \
token_content = GraphQLTokenString##token_type; \
break;
#define DYNAMIC_VALUE_TOKEN(token_type) \
case token_type: \
token_sym = ID2SYM(rb_intern(#token_type)); \
token_content = rb_utf8_str_new(ts, te - ts); \
break;
void emit(TokenType tt, char *ts, char *te, Meta *meta) {
meta->tokens_count++;
// -1 indicates that there is no limit:
if (meta->max_tokens > 0 && meta->tokens_count > meta->max_tokens) {
VALUE mGraphQL = rb_const_get_at(rb_cObject, rb_intern("GraphQL"));
VALUE cParseError = rb_const_get_at(mGraphQL, rb_intern("ParseError"));
VALUE exception = rb_funcall(
cParseError, rb_intern("new"), 4,
rb_str_new_cstr("This query is too large to execute."),
LONG2NUM(meta->line),
LONG2NUM(meta->col),
rb_str_new_cstr(meta->query_cstr)
);
rb_exc_raise(exception);
}
int quotes_length = 0; // set by string tokens below
int line_incr = 0;
VALUE token_sym = Qnil;
VALUE token_content = Qnil;
int this_token_is_number = 0;
switch(tt) {
STATIC_VALUE_TOKEN(ON, "on")
STATIC_VALUE_TOKEN(FRAGMENT, "fragment")
STATIC_VALUE_TOKEN(QUERY, "query")
STATIC_VALUE_TOKEN(MUTATION, "mutation")
STATIC_VALUE_TOKEN(SUBSCRIPTION, "subscription")
STATIC_VALUE_TOKEN(REPEATABLE, "repeatable")
STATIC_VALUE_TOKEN(RCURLY, "}")
STATIC_VALUE_TOKEN(LCURLY, "{")
STATIC_VALUE_TOKEN(RBRACKET, "]")
STATIC_VALUE_TOKEN(LBRACKET, "[")
STATIC_VALUE_TOKEN(RPAREN, ")")
STATIC_VALUE_TOKEN(LPAREN, "(")
STATIC_VALUE_TOKEN(COLON, ":")
STATIC_VALUE_TOKEN(VAR_SIGN, "$")
STATIC_VALUE_TOKEN(DIR_SIGN, "@")
STATIC_VALUE_TOKEN(ELLIPSIS, "...")
STATIC_VALUE_TOKEN(EQUALS, "=")
STATIC_VALUE_TOKEN(BANG, "!")
STATIC_VALUE_TOKEN(PIPE, "|")
STATIC_VALUE_TOKEN(AMP, "&")
STATIC_VALUE_TOKEN(SCHEMA, "schema")
STATIC_VALUE_TOKEN(SCALAR, "scalar")
STATIC_VALUE_TOKEN(EXTEND, "extend")
STATIC_VALUE_TOKEN(IMPLEMENTS, "implements")
STATIC_VALUE_TOKEN(INTERFACE, "interface")
STATIC_VALUE_TOKEN(UNION, "union")
STATIC_VALUE_TOKEN(ENUM, "enum")
STATIC_VALUE_TOKEN(DIRECTIVE, "directive")
STATIC_VALUE_TOKEN(INPUT, "input")
// For these, the enum name doesn't match the symbol name:
case TYPE_LITERAL:
token_sym = ID2SYM(rb_intern("TYPE"));
token_content = GraphQL_type_str;
break;
case TRUE_LITERAL:
token_sym = ID2SYM(rb_intern("TRUE"));
token_content = GraphQL_true_str;
break;
case FALSE_LITERAL:
token_sym = ID2SYM(rb_intern("FALSE"));
token_content = GraphQL_false_str;
break;
case NULL_LITERAL:
token_sym = ID2SYM(rb_intern("NULL"));
token_content = GraphQL_null_str;
break;
case IDENTIFIER:
if (meta->reject_numbers_followed_by_names && meta->preceeded_by_number) {
VALUE mGraphQL = rb_const_get_at(rb_cObject, rb_intern("GraphQL"));
VALUE mCParser = rb_const_get_at(mGraphQL, rb_intern("CParser"));
VALUE exception = rb_funcall(
mCParser, rb_intern("prepare_number_name_parse_error"), 5,
LONG2NUM(meta->line),
LONG2NUM(meta->col),
rb_str_new_cstr(meta->query_cstr),
rb_ary_entry(meta->previous_token, 3),
rb_utf8_str_new(ts, te - ts)
);
rb_exc_raise(exception);
}
token_sym = ID2SYM(rb_intern("IDENTIFIER"));
if (meta->dedup_identifiers) {
token_content = rb_enc_interned_str(ts, te - ts, rb_utf8_encoding());
} else {
token_content = rb_utf8_str_new(ts, te - ts);
}
break;
// Can't use these while we're in backwards-compat mode:
// DYNAMIC_VALUE_TOKEN(INT)
// DYNAMIC_VALUE_TOKEN(FLOAT)
case INT:
token_sym = ID2SYM(rb_intern("INT"));
token_content = rb_utf8_str_new(ts, te - ts);
this_token_is_number = 1;
break;
case FLOAT:
token_sym = ID2SYM(rb_intern("FLOAT"));
token_content = rb_utf8_str_new(ts, te - ts);
this_token_is_number = 1;
break;
DYNAMIC_VALUE_TOKEN(COMMENT)
case UNKNOWN_CHAR:
if (ts[0] == '\0') {
return;
} else {
token_content = rb_utf8_str_new(ts, te - ts);
token_sym = ID2SYM(rb_intern("UNKNOWN_CHAR"));
break;
}
case QUOTED_STRING:
quotes_length = 1;
token_content = rb_utf8_str_new(ts + quotes_length, (te - ts - (2 * quotes_length)));
token_sym = ID2SYM(rb_intern("STRING"));
break;
case BLOCK_STRING:
token_sym = ID2SYM(rb_intern("STRING"));
quotes_length = 3;
token_content = rb_utf8_str_new(ts + quotes_length, (te - ts - (2 * quotes_length)));
line_incr = FIX2INT(rb_funcall(token_content, rb_intern("count"), 1, rb_utf8_str_new_cstr("\n")));
break;
// These are used only by the parser, this is never reached
case STRING:
case BAD_UNICODE_ESCAPE:
break;
}
if (token_sym != Qnil) {
if (tt == BLOCK_STRING || tt == QUOTED_STRING) {
VALUE mGraphQL = rb_const_get_at(rb_cObject, rb_intern("GraphQL"));
VALUE mGraphQLLanguage = rb_const_get_at(mGraphQL, rb_intern("Language"));
VALUE mGraphQLLanguageLexer = rb_const_get_at(mGraphQLLanguage, rb_intern("Lexer"));
VALUE valid_string_pattern = rb_const_get_at(mGraphQLLanguageLexer, rb_intern("VALID_STRING"));
if (tt == BLOCK_STRING) {
VALUE mGraphQLLanguageBlockString = rb_const_get_at(mGraphQLLanguage, rb_intern("BlockString"));
token_content = rb_funcall(mGraphQLLanguageBlockString, rb_intern("trim_whitespace"), 1, token_content);
tt = STRING;
} else {
tt = STRING;
if (
RB_TEST(rb_funcall(token_content, rb_intern("valid_encoding?"), 0)) &&
RB_TEST(rb_funcall(token_content, rb_intern("match?"), 1, valid_string_pattern))
) {
rb_funcall(mGraphQLLanguageLexer, rb_intern("replace_escaped_characters_in_place"), 1, token_content);
if (!RB_TEST(rb_funcall(token_content, rb_intern("valid_encoding?"), 0))) {
token_sym = ID2SYM(rb_intern("BAD_UNICODE_ESCAPE"));
tt = BAD_UNICODE_ESCAPE;
}
} else {
token_sym = ID2SYM(rb_intern("BAD_UNICODE_ESCAPE"));
tt = BAD_UNICODE_ESCAPE;
}
}
}
VALUE token = rb_ary_new_from_args(6,
token_sym,
rb_int2inum(meta->line),
rb_int2inum(meta->col),
token_content,
meta->previous_token,
INT2FIX(200 + (int)tt)
);
// COMMENTs are retained as `previous_token` but aren't pushed to the normal token list
if (tt != COMMENT) {
rb_ary_push(meta->tokens, token);
}
meta->preceeded_by_number = this_token_is_number;
meta->previous_token = token;
}
// Bump the column counter for the next token
meta->col += te - ts;
meta->line += line_incr;
}
VALUE tokenize(VALUE query_rbstr, int fstring_identifiers, int reject_numbers_followed_by_names, int max_tokens) {
int cs = 0;
int act = 0;
char *p = StringValueCStr(query_rbstr);
char *pe = p + strlen(p);
char *eof = pe;
char *ts = 0;
char *te = 0;
VALUE tokens = rb_ary_new();
struct Meta meta_s = {1, 1, p, pe, tokens, Qnil, fstring_identifiers, reject_numbers_followed_by_names, 0, max_tokens, 0};
Meta *meta = &meta_s;
%% write init;
%% write exec;
return tokens;
}
#define SETUP_STATIC_TOKEN_VARIABLE(token_name, token_content) \
GraphQLTokenString##token_name = rb_utf8_str_new_cstr(token_content); \
rb_funcall(GraphQLTokenString##token_name, rb_intern("-@"), 0); \
rb_global_variable(&GraphQLTokenString##token_name); \
#define SETUP_STATIC_STRING(var_name, str_content) \
var_name = rb_utf8_str_new_cstr(str_content); \
rb_global_variable(&var_name); \
rb_str_freeze(var_name); \
void setup_static_token_variables() {
SETUP_STATIC_TOKEN_VARIABLE(ON, "on")
SETUP_STATIC_TOKEN_VARIABLE(FRAGMENT, "fragment")
SETUP_STATIC_TOKEN_VARIABLE(QUERY, "query")
SETUP_STATIC_TOKEN_VARIABLE(MUTATION, "mutation")
SETUP_STATIC_TOKEN_VARIABLE(SUBSCRIPTION, "subscription")
SETUP_STATIC_TOKEN_VARIABLE(REPEATABLE, "repeatable")
SETUP_STATIC_TOKEN_VARIABLE(RCURLY, "}")
SETUP_STATIC_TOKEN_VARIABLE(LCURLY, "{")
SETUP_STATIC_TOKEN_VARIABLE(RBRACKET, "]")
SETUP_STATIC_TOKEN_VARIABLE(LBRACKET, "[")
SETUP_STATIC_TOKEN_VARIABLE(RPAREN, ")")
SETUP_STATIC_TOKEN_VARIABLE(LPAREN, "(")
SETUP_STATIC_TOKEN_VARIABLE(COLON, ":")
SETUP_STATIC_TOKEN_VARIABLE(VAR_SIGN, "$")
SETUP_STATIC_TOKEN_VARIABLE(DIR_SIGN, "@")
SETUP_STATIC_TOKEN_VARIABLE(ELLIPSIS, "...")
SETUP_STATIC_TOKEN_VARIABLE(EQUALS, "=")
SETUP_STATIC_TOKEN_VARIABLE(BANG, "!")
SETUP_STATIC_TOKEN_VARIABLE(PIPE, "|")
SETUP_STATIC_TOKEN_VARIABLE(AMP, "&")
SETUP_STATIC_TOKEN_VARIABLE(SCHEMA, "schema")
SETUP_STATIC_TOKEN_VARIABLE(SCALAR, "scalar")
SETUP_STATIC_TOKEN_VARIABLE(EXTEND, "extend")
SETUP_STATIC_TOKEN_VARIABLE(IMPLEMENTS, "implements")
SETUP_STATIC_TOKEN_VARIABLE(INTERFACE, "interface")
SETUP_STATIC_TOKEN_VARIABLE(UNION, "union")
SETUP_STATIC_TOKEN_VARIABLE(ENUM, "enum")
SETUP_STATIC_TOKEN_VARIABLE(DIRECTIVE, "directive")
SETUP_STATIC_TOKEN_VARIABLE(INPUT, "input")
SETUP_STATIC_STRING(GraphQL_type_str, "type")
SETUP_STATIC_STRING(GraphQL_true_str, "true")
SETUP_STATIC_STRING(GraphQL_false_str, "false")
SETUP_STATIC_STRING(GraphQL_null_str, "null")
}