Class: Vinter::Lexer

Inherits:
Object
  • Object
show all
Defined in:
lib/vinter/lexer.rb

Constant Summary collapse

TOKEN_TYPES = 
{
  # Vim9 specific keywords
  keyword: /\b(if|else|elseif|endif|while|endwhile|for|endfor|def|enddef|function|endfunction|return|const|var|final|import|export|class|extends|static|enum|type|vim9script|abort)\b/,
  # Identifiers can include # and special characters
  identifier: /\b[a-zA-Z_][a-zA-Z0-9_#]*\b/,
  # Single-character operators
  operator: /[\+\-\*\/=<>!&\|\.]/,
  # Multi-character operators handled separately
  number: /\b\d+(\.\d+)?\b/,
  # Handle both single and double quoted strings
  string: /"([^"\\]|\\.)*"|'([^'\\]|\\.)*'/,
  # Vim9 comments use #
  comment: /#.*/,
  whitespace: /\s+/,
  brace_open: /\{/,
  brace_close: /\}/,
  paren_open: /\(/,
  paren_close: /\)/,
  bracket_open: /\[/,
  bracket_close: /\]/,
  colon: /:/,
  semicolon: /;/,
  comma: /,/,
}

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Lexer

Returns a new instance of Lexer.



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# File 'lib/vinter/lexer.rb', line 28

def initialize(input)
  @input = input
  @tokens = []
  @position = 0
  @line_num = 1
  @column = 1
end

Instance Method Details

#tokenize ⇒ Object 



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# File 'lib/vinter/lexer.rb', line 36

def tokenize
  until @position >= @input.length
    chunk = @input[@position..-1]
    
    # Handle multi-character operators explicitly
    if match = chunk.match(/\A(==|!=|=>|->|\.\.)/)
      @tokens << { 
        type: :operator, 
        value: match[0], 
        line: @line_num, 
        column: @column 
      }
      @column += match[0].length
      @position += match[0].length
      next
    end
    
    # Handle ellipsis for variable args
    if chunk.start_with?('...')
      @tokens << { 
        type: :ellipsis, 
        value: '...', 
        line: @line_num, 
        column: @column 
      }
      @column += 3
      @position += 3
      next
    end
    
    # Skip whitespace but track position
    if match = chunk.match(/\A(\s+)/)
      whitespace = match[0]
      whitespace.each_char do |c|
        if c == "\n"
          @line_num += 1
          @column = 1
        else
          @column += 1
        end
      end
      @position += whitespace.length
      next
    end
    
    match_found = false
    
    TOKEN_TYPES.each do |type, pattern|
      if match = chunk.match(/\A(#{pattern})/)
        value = match[0]
        token = { 
          type: type, 
          value: value, 
          line: @line_num, 
          column: @column 
        }
        @tokens << token unless type == :whitespace
        
        # Update position
        if value.include?("\n")
          lines = value.split("\n")
          @line_num += lines.size - 1
          if lines.size > 1
            @column = lines.last.length + 1
          else
            @column += value.length
          end
        else
          @column += value.length
        end
        
        @position += value.length
        match_found = true
        break
      end
    end
    
    unless match_found
      # Try to handle unknown characters
      @tokens << { 
        type: :unknown, 
        value: chunk[0], 
        line: @line_num, 
        column: @column 
      }
      
      if chunk[0] == "\n"
        @line_num += 1
        @column = 1
      else
        @column += 1
      end
      
      @position += 1
    end
  end
  
  @tokens
end