class Ven::Reader

• Ven::Reader
• Reference
• Object

Overview

A reader based on Pratt's parsing algorithm.

Included Modules

• Ven::Suite

Defined in:

ven/read.cr

Constant Summary

KEYWORDS = ["_", "&_", "nud", "not", "is", "in", "if", "else", "fun", "given", "loop", "next", "queue", "ensure", "expose", "distinct", "box", "and", "or", "return", "dies", "to"] of ::String

A list of keywords protected by the reader.

RX_IGNORE = /^(#{Ven.regex_for(:IGNORE)})/

RX_NUMBER = /^(#{Ven.regex_for(:NUMBER)})/

RX_REGEX = /^(#{Ven.regex_for(:REGEX)})/

RX_SPECIAL = /^(#{Ven.regex_for(:SPECIAL)})/

RX_STRING = /^(#{Ven.regex_for(:STRING)})/

RX_SYMBOL = /^(#{Ven.regex_for(:SYMBOL)})/

Constructors

• .new(context : Ven::Suite::Context::Reader, file : String, src : String)

Instance Method Summary

• #before(type : String, unit : -> T = ->led) forall T

  Expects type after calling unit.

• #context : Context::Reader
• #die(message : String)

  Given the explanation message, dies of ParseError.

• #eoi?

  Returns whether this token is a valid statement delimiter.

• #expect(*restrictions : String)

  Reads a word if one of the restrictions matches the current word's type.

• #is_led?(only pick : Parselet::Led.class)

  Returns whether this word is a led.

• #is_led?

  Returns whether this word is a led.

• #is_nud?(only pick : Parselet::Nud.class)

  Returns whether this word is a nud.

• #is_nud?

  Returns whether this word is a nud.

• #is_stmt?

  Returns whether this word is a statement.

• #keyword(trigger : String)
• #led(level = Precedence::ZERO.value) : Quote

  Parses a led expression with precedence level.

• #led=(led : Hash(String, Ven::Parselet::Led))
• #nud : Hash(String, Ven::Parselet::Nud)
• #nud=(nud : Hash(String, Ven::Parselet::Nud))
• #prepare

  Initializes this reader so it is capable of reading base Ven.

• #program(&)

  Parses the program (i.e., zero or more statements followed by EOF).

• #repeat(stop : String | Nil = nil, sep : String | Nil = nil, unit : -> T = ->led) forall T

  Calls unit repeatedly, remembering what each call results in, and returns an Array of the results.

• #statement : Quote

  Parses a single statament.

• #to_s(io)
• #word : {type: String, lexeme: String, line: UInt32}
• #word!(restriction : String)

  Reads a word if the type of the current word is restriction.

• #word!

  Returns the current word and consumes the next one.

Constructor Detail

Instance Method Detail