Find
mis-matched syntax based on lexical count
Used for detecting missing pairs of elements each keyword needs an end, each ‘{’ needs a ‘}’ etc.
Example:
left_right = LeftRightLexCount.new left_right.count_kw left_right.missing.first # => "end" left_right = LeftRightLexCount.new source = "{ a: b, c: d" # Note missing '}' LexAll.new(source: source).each do |lex| left_right.count_lex(lex) end left_right.missing.first # => "}"
Constants
No documentation available
Class Methods
::
lib/syntax_suggest/left_right_lex_count.rb
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# File tmp/rubies/ruby-master/lib/syntax_suggest/left_right_lex_count.rb, line 25
def initialize
@kw_count = 0
@end_count = 0
@count_for_char = {
"{" => 0,
"}" => 0,
"[" => 0,
"]" => 0,
"(" => 0,
")" => 0,
"|" => 0
}
end
No documentation available
Instance Methods
lib/syntax_suggest/left_right_lex_count.rb
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# File tmp/rubies/ruby-master/lib/syntax_suggest/left_right_lex_count.rb, line 44
def count_end
@end_count += 1
end
No documentation available
lib/syntax_suggest/left_right_lex_count.rb
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# File tmp/rubies/ruby-master/lib/syntax_suggest/left_right_lex_count.rb, line 101
def count_for_char(char)
@count_for_char[char]
end
No documentation available
#
lib/syntax_suggest/left_right_lex_count.rb
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# File tmp/rubies/ruby-master/lib/syntax_suggest/left_right_lex_count.rb, line 40
def count_kw
@kw_count += 1
end
No documentation available
lib/syntax_suggest/left_right_lex_count.rb
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# File tmp/rubies/ruby-master/lib/syntax_suggest/left_right_lex_count.rb, line 58
def count_lex(lex)
case lex.type
when :on_tstring_content
# ^^^
# Means it's a string or a symbol `"{"` rather than being
# part of a data structure (like a hash) `{ a: b }`
# ignore it.
when :on_words_beg, :on_symbos_beg, :on_qwords_beg,
:on_qsymbols_beg, :on_regexp_beg, :on_tstring_beg
# ^^^
# Handle shorthand syntaxes like `%Q{ i am a string }`
#
# The start token will be the full thing `%Q{` but we
# need to count it as if it's a `{`. Any token
# can be used
char = lex.token[-1]
@count_for_char[char] += 1 if @count_for_char.key?(char)
when :on_embexpr_beg
# ^^^
# Embedded string expressions like `"#{foo} <-embed"`
# are parsed with chars:
#
# `#{` as :on_embexpr_beg
# `}` as :on_embexpr_end
#
# We cannot ignore both :on_emb_expr_beg and :on_embexpr_end
# because sometimes the lexer thinks something is an embed
# string end, when it is not like `lol = }` (no clue why).
#
# When we see `#{` count it as a `{` or we will
# have a mis-match count.
#
case lex.token
when "\#{"
@count_for_char["{"] += 1
end
else
@end_count += 1 if lex.is_end?
@kw_count += 1 if lex.is_kw?
@count_for_char[lex.token] += 1 if @count_for_char.key?(lex.token)
end
end
Count source code characters
Example:
left_right = LeftRightLexCount.new left_right.count_lex(LexValue.new(1, :on_lbrace, "{", Ripper::EXPR_BEG)) left_right.count_for_char("{") # => 1 left_right.count_for_char("}") # => 0
#
lib/syntax_suggest/left_right_lex_count.rb
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# File tmp/rubies/ruby-master/lib/syntax_suggest/left_right_lex_count.rb, line 110
def missing
out = missing_pairs
out << missing_pipe
out << missing_keyword_end
out.compact!
out
end
Returns an array of missing syntax characters or ‘“end”` or `“keyword”`
left_right.missing # => ["}"]
lib/syntax_suggest/left_right_lex_count.rb
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# File tmp/rubies/ruby-master/lib/syntax_suggest/left_right_lex_count.rb, line 148
def missing_keyword_end
case @kw_count <=> @end_count
when 1
"end"
when 0
nil
when -1
"keyword"
end
end
Keywords need ends and ends need keywords
If we have more keywords, there’s a missing ‘end` if we have more `end`-s, there’s a missing keyword
lib/syntax_suggest/left_right_lex_count.rb
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# File tmp/rubies/ruby-master/lib/syntax_suggest/left_right_lex_count.rb, line 131
def missing_pairs
PAIRS.map do |(left, right)|
case @count_for_char[left] <=> @count_for_char[right]
when 1
right
when 0
nil
when -1
left
end
end
end
Opening characters like ‘{` need closing characters # like `}`.
When a mis-match count is detected, suggest the missing member.
For example if there are 3 ‘}` and only two `{` return `“{”`
lib/syntax_suggest/left_right_lex_count.rb
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# File tmp/rubies/ruby-master/lib/syntax_suggest/left_right_lex_count.rb, line 162
def missing_pipe
if @count_for_char["|"].odd?
"|"
end
end
Pipes come in pairs. If there’s an odd number of pipes then we are missing one