shard-ameba/src/ameba/rule/lint/percent_array.cr

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module Ameba::Rule::Lint
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# A rule that disallows some unwanted symbols in percent array literals.
#
# For example, this is usually written by mistake:
#
# ```
# %i(:one, :two)
# %w("one", "two")
# ```
#
# And the expected example is:
#
# ```
# %i(one two)
# %w(one two)
# ```
#
# YAML configuration example:
#
# ```
# Lint/PercentArrays:
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# Enabled: true
# StringArrayUnwantedSymbols: ',"'
# SymbolArrayUnwantedSymbols: ',:'
# ```
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class PercentArrays < Base
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properties do
description "Disallows some unwanted symbols in percent array literals"
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string_array_unwanted_symbols %(,")
symbol_array_unwanted_symbols %(,:)
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end
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MSG = "Symbols `%s` may be unwanted in %s array literals"
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def test(source)
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issue = start_token = nil
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Tokenizer.new(source).run do |token|
case token.type
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when .string_array_start?, .symbol_array_start?
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start_token = token.dup
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when .string?
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if start_token && issue.nil?
issue = array_entry_invalid?(token.value, start_token.not_nil!.raw)
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end
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when .string_array_end?
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if issue
issue_for start_token.not_nil!, issue.not_nil!
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end
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issue = start_token = nil
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end
end
end
private def array_entry_invalid?(entry, array_type)
case array_type
when .starts_with? "%w"
check_array_entry entry, string_array_unwanted_symbols, "%w"
when .starts_with? "%i"
check_array_entry entry, symbol_array_unwanted_symbols, "%i"
end
end
private def check_array_entry(entry, symbols, literal)
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MSG % {symbols, literal} if entry =~ /[#{symbols}]/
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end
end
end