Lexer
class Lexer extends Core (View source)
Performs lexical analysis over a SQL statement and splits it in multiple tokens.
The output of the lexer is affected by the context of the SQL statement.
Properties
| bool | $strict | Whether errors should throw exceptions or just be stored. | from Core |
| Exception[] | $errors | List of errors that occurred during lexing. | from Core |
| static array | $PARSER_METHODS | A list of methods that are used in lexing the SQL query. | |
| string|UtfString | $str | The string to be parsed. | |
| int | $len | The length of $str. |
|
| int | $last | The index of the last parsed character. | |
| TokensList | $list | Tokens extracted from given strings. | |
| static string | $DEFAULT_DELIMITER | The default delimiter. This is used, by default, in all new instances. | |
| string | $delimiter | Statements delimiter. | |
| int | $delimiterLen | The length of the delimiter. |
Methods
Creates a new error log.
Gets the tokens list parsed by a new instance of a lexer.
No description
Sets the delimiter.
Parses the string and extracts lexemes.
Parses a keyword.
Parses a label.
Parses an operator.
Parses a whitespace.
Parses a comment.
Parses a boolean.
Parses a number.
Parses a string.
Parses a symbol.
Parses unknown parts of the query.
Parses the delimiter of the query.
Details
error(string $msg, string $str = '', int $pos = 0, int $code = 0)
Creates a new error log.
static TokensList
getTokens(string|UtfString $str, bool $strict = false, string $delimiter = null)
Gets the tokens list parsed by a new instance of a lexer.
__construct(string|UtfString $str, bool $strict = false, string $delimiter = null)
setDelimiter(string $delimiter)
Sets the delimiter.
lex()
Parses the string and extracts lexemes.
Token|null
parseKeyword()
Parses a keyword.
Token|null
parseLabel()
Parses a label.
Token|null
parseOperator()
Parses an operator.
Token|null
parseWhitespace()
Parses a whitespace.
Token|null
parseComment()
Parses a comment.
Token|null
parseBool()
Parses a boolean.
Token|null
parseNumber()
Parses a number.
Token|null
parseString(string $quote = '')
Parses a string.
Token|null
parseSymbol()
Parses a symbol.
Token|null
parseUnknown()
Parses unknown parts of the query.
Token|null
parseDelimiter()
Parses the delimiter of the query.