Programming Parsers

ParserObjects contains parsers for some common constructs from modern programming languages. Notice that several languages “borrow” or “inherit” similar rules from related languages. In these cases, parsers will not typically be reproduced for each language. A C++-style identifier is identical to a C-style identifier, for example, so the methods will not be duplicated. These parsers are provided for ease and convenience only, and do not guarantee completeness or correctness across all possible forms or versions.

C Parsers

The C-Style parsers are used to parse some common constructs from C and programming languages derived from it.

using static ParserObjects.CStyleParserMethods;

Comments

A C-style comment starts with /* and ends with */ and can go across multiple lines. This is also known as a “multi-line comment” in C, C++, C# and other similar languages.

var parser = Comment();

Numbers

A C-style hexadecimal string starts with the prefix 0x and is followed by one more more hexadecimal digits. The HexadecimalString parser returns the matched string, while the HexadecimalInteger parser parses the string and returns an int.

var parser = HexadecimalString();
var parser = HexadecimalInteger();

A C-style integer may be the literal number 0, or it may have an optional - for negative followed by a non-zero digit, followed by a string of zero or more digits. The IntegerString parser returns the literal string, while the Integer parser returns the parsed int.

var parser = IntegerString();
var parser = Integer();

A C-style floating point number has a whole and fractional part separated by a .. The DoubleString parser returns the literal string, while the Double parser returns the parsed double. (These parsers do not currently recognize the f suffix to denote a Float literal).

var parser = DoubleString();
var parser = Double();

Identifiers

A C-style identifier may start with an underscore (_) or a letter, and may be followed by zero or more underscores, letters or digits.

var parser = Identifier();

String

A C-style string uses double-quotes and backslash-escapes with a few predefined escape sequences, hex codes, octal codes, and unicode code points. The String parser parses the literal string and returns the whole thing as-written, including quotes and escapes. The StrippedString parser removes the quotes and replaces the escape sequences with the characters they represent.

var parser = String();
var parser = StrippedString();

C++ Parsers

using static ParserObjects.CPlusPlusStyleParsersMethods;

Comments

A C++-style comment, also known as a “single line comment” starts with the prefix “//” and continues to the end of the current line.

var parser = Comment();

JavaScript Parsers

Numbers

A JavaScript number has a complicated set of rules and may be an integer, a floating point value or use scientific notation. The NumberString parser returns the literal parsed string while the Number parser returns the parsed double value.

var parser = NumberString();
var parser = Number();

SQL Parsers

using static ParserObjects.SqlStyleParserMethods;

Comments

An SQL comment starts with the prefix “--” and continues to the end of the line.

var parser = Comment();

Strings

JavaScript-style strings may be single- or double-quoted, they use backslash-escapes including hex escapes and unicode code points. The String parser returns the whole literal string, including quotes and escapes. The StrippedString parser returns the value of the string, without the quotes and with the backslash escapes converted into their actual byte forms.

var parser = String();
var parser = StrippedString();