gems.scss_lint-0.57.0.lib.scss_lint.linter.zero_unit.rb Maven / Gradle / Ivy

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A Maven Plugin that compiles Sass files.

There is a newer version: 3.7.2

# frozen_string_literal: true

module SCSSLint
  # Checks for unnecessary units on zero values.
  class Linter::ZeroUnit < Linter
    include LinterRegistry

    def visit_script_string(node)
      return unless node.type == :identifier
      return if node.value.start_with?('calc(')

      node.value.scan(ZERO_UNIT_REGEX) do |match|
        next unless zero_with_length_units?(match.first)
        add_lint(node, MESSAGE_FORMAT % match.first)
      end
    end

    def visit_script_number(node)
      length = source_from_range(node.source_range)[ZERO_UNIT_REGEX, 1]
      return unless zero_with_length_units?(length)

      add_lint(node, MESSAGE_FORMAT % length)
    end

    def visit_script_funcall(node)
      # Don't report errors for values within `calc` expressions, since they
      # require units in order to work
      yield unless node.name == 'calc'
    end

  private

    ZERO_UNIT_REGEX = /
      \b
      (?