module Parsem

Overview

Parsec-like parser combinators for Crystal.

https://github.com/ThatsJustCheesy/parsem

Extended Modules

• Parsem

Defined in:

Constant Summary

VERSION = "1.1.2"

Instance Method Summary

• #alternatives(parsers : Array(Parser(Token, Output))) : Parser(Token, Output) forall Token, Output

  Folds the choice operator (Parser#|) over parsers.

• #any(type : Token.class) : Parser(Token, Token) forall Token

  Parses any token of type type.

• #concat(array_1 : Array(Value), array_2 : Array(Value)) : Array(Value) forall Value
• #concat_string(string_1 : String, string_2 : String) : String
• #digit : Parser(Char, Char)

  Parses a decimal digit (0–9).

• #extend(value : Value, array : Array(Value)) : Array(Value) forall Value
• #extend(array : Array(Value), value : Value) : Array(Value) forall Value
• #extend_string(char : Char, string : String) : String
• #extend_string(string : String, char : Char) : String
• #letter : Parser(Char, Char)

  Parses a letter of the Latin alphabet (a–z, A–Z).

• #none_of(tokens : Array(Token)) : Parser(Token, Token) forall Token

  Parses any single token not in tokens.

• #not(token : Token) : Parser(Token, Token) forall Token

  Parses any token except #token.

• #one_of(tokens : Array(Token)) : Parser(Token, Token) forall Token

  Parses any single token of tokens.

• #string(string : String) : Parser(Char, String)
• #token(token : Token) : Parser(Token, Token) forall Token

  Parses #token.

• #whitespace : Parser(Char, Char)

  Parses a whitespace character (space, \t, \r, \n).

• #ws

  Shortcut for zero or more #whitespace characters.

Macro Summary

• infer(proc_pointer, file = __FILE__, line = __LINE__)

  Attempts to infer the parameter types of a ->A.b proc literal.

• lazy(parser)

  Defers the creation of parser until it is used.

Instance Method Detail

Macro Detail

record Foo, int32 : Int32

make_a_foo = infer(->Foo.new)
make_a_foo.call(123) # => Foo(@int32 = 123)