Module: Rvim::Syntax

Defined in:
lib/rvim/syntax.rb

Constant Summary collapse

COLORS = 
{
  red:     "\e[31m",
  green:   "\e[32m",
  yellow:  "\e[33m",
  blue:    "\e[34m",
  magenta: "\e[35m",
  cyan:    "\e[36m",
  white:   "\e[37m",
  default: "\e[39m",
}.freeze
RESET = 
"\e[39m"

Class Method Summary collapse

Class Method Details

.coalesce(segments) ⇒ Object

Drop overlapping segments, keeping the earliest-starting one. Tokens registered first dominate later ones at the same starting byte because Ruby’s stable sort preserves insertion order on tie.



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# File 'lib/rvim/syntax.rb', line 52

def self.coalesce(segments)
  sorted = segments.sort_by { |s, _e, _c| s }
  kept = []
  last_end = -1
  sorted.each do |s, e, c|
    next if s <= last_end

    kept << [s, e, c]
    last_end = e
  end
  kept
end

.detect_language(filepath) ⇒ Object 



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# File 'lib/rvim/syntax.rb', line 65

def self.detect_language(filepath)
  return nil unless filepath

  case File.extname(filepath)
  when '.rb', '.gemspec', '.rake' then :ruby
  when '.md', '.markdown' then :markdown
  when '.json' then :json
  when '.sh', '.bash', '.zsh', '.ksh' then :shell
  when '.py', '.pyw' then :python
  when '.js', '.mjs', '.cjs', '.jsx', '.ts', '.tsx' then :javascript
  when '.yml', '.yaml' then :yaml
  end
end

.highlight(line, lang) ⇒ Object

Returns Array of [byte_start, byte_end, color_symbol]. byte_end is inclusive (matches our existing highlight conventions).



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# File 'lib/rvim/syntax.rb', line 29

def self.highlight(line, lang)
  table = @tokens[lang]
  return [] unless table

  segments = []
  table.each do |tok|
    offset = 0
    pattern = tok[:pattern]
    while (m = pattern.match(line, offset))
      b = m.pre_match.bytesize
      e = b + m[0].bytesize
      break if e == b # zero-width safety

      segments << [b, e - 1, tok[:color]]
      offset = m.end(0)
    end
  end
  coalesce(segments)
end

.register(lang, tokens) ⇒ Object 



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# File 'lib/rvim/syntax.rb', line 19

def self.register(lang, tokens)
  @tokens[lang] = tokens
end

.tokens_for(lang) ⇒ Object 



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# File 'lib/rvim/syntax.rb', line 23

def self.tokens_for(lang)
  @tokens[lang]
end