Module: Electr::Lexer

Defined in:
lib/electr/parser/lexer.rb

Overview

Lexical analysis.

Class Method Summary collapse

Class Method Details

.lexify(token) ⇒ Object

Public: Build a LexicalUnit from a given token.

token - A String token to transform in LexicalUnit.

Returns a LexicalUnit.



13
14
15
16
17
18
19
20
21
22
23
24
25
26
 
# File 'lib/electr/parser/lexer.rb', line 13

def self.lexify(token)
  case token
  when ->(x) { x.numeric? } then LexicalUnit.numeric(token)
  when ->(x) { x.operator? } then LexicalUnit.operator(token)
  when ->(x) { x.constant? } then LexicalUnit.constant(token)
  when ->(x) { x.value? } then LexicalUnit.value(token)
  when ->(x) { x.variable? } then LexicalUnit.variable(token)
  when ->(x) { x == '(' } then LexicalUnit.open_parenthesis
  when ->(x) { x == ')' } then LexicalUnit.closed_parenthesis
  when ->(x) { x == '=' } then LexicalUnit.assign
  when ->(x) { SYMBOL_TABLE[x] == 'f' } then LexicalUnit.fname(token)
  else LexicalUnit.name(token)
  end
end