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# 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
(?<!\.|\#) # Ignore zeroes following `#` (colors) or `.` (decimals)
(0[a-z]+) # Zero followed by letters indicating some sort of unit
\b
/ix
MESSAGE_FORMAT = '`%s` should be written without units as `0`'.freeze
LENGTH_UNITS = %w[em ex ch rem vw vh vmin vmax cm mm in pt pc px].to_set
def zero_with_length_units?(string)
string =~ /^0([a-z]+)/ && LENGTH_UNITS.include?(Regexp.last_match(1))
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems