Class: Codgen::Statement
Constant Summary
RegularExpressions::IDENTIFIER_REGEX
Instance Attribute Summary collapse
Instance Method Summary
collapse
Constructor Details
#initialize(operator = nil) ⇒ Statement
Returns a new instance of Statement.
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# File 'lib/codgen/statement.rb', line 8
def initialize(operator=nil)
@words = Array.new
@operator = operator
end
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Instance Attribute Details
#operator ⇒ Object
Returns the value of attribute operator.
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# File 'lib/codgen/statement.rb', line 25
def operator
@operator
end
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#words ⇒ Object
Returns the value of attribute words.
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# File 'lib/codgen/statement.rb', line 26
def words
@words
end
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Instance Method Details
#accumulate(before, child, operator, get_val) ⇒ Object
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# File 'lib/codgen/statement.rb', line 28
def accumulate(before, child, operator, get_val)
if operator == nil && child.is_a?(Statement)
accumulate(before, child, child.operator, get_val)
else
value = child.is_a?(String) ? get_val.call(child) : child.evaluate(get_val)
case operator
when :and
before = before != nil ? before : true
before && value
when :or
before = before != nil ? before : false
before || value
when :not
!value
else
value
end
end
end
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#evaluate(get_val) ⇒ Object
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# File 'lib/codgen/statement.rb', line 13
def evaluate(get_val)
if @operator == nil
expand
end
current_val = nil
@words.each do |child|
current_val = accumulate(current_val, child, @operator, get_val)
end
current_val
end
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#expand ⇒ Object
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# File 'lib/codgen/statement.rb', line 48
def expand
expand_not
expand_and
expand_or
end
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#expand_and ⇒ Object
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# File 'lib/codgen/statement.rb', line 101
def expand_and
new_words = Array.new
index = -1
skip = false
@words.each do |word|
index+=1
if skip
skip = false
next
end
if word.is_a?(Statement)
new_words.push(word)
elsif word.index(/and|&/)
if new_words.count > 0 && @words.count > index + 1
left = new_words[-1]
new_words.delete_at(-1)
new_words.push(Statement.new(:and))
new_words[-1].words.push(left)
new_words[-1].words.push(@words[index+1])
skip = true
next
else
throw 'Operator must have a left and a right side'
end
else
new_words.push(word)
end
end
@words = new_words
end
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#expand_not ⇒ Object
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# File 'lib/codgen/statement.rb', line 79
def expand_not
new_words = Array.new
@words.each do |word|
if word.is_a?(Statement)
new_words.push(word)
elsif word.index(/not|!/)
if new_words[-1].is_a?(Statement) && new_words[-1].operator == :not
new_words.delete_at(-1)
else
new_words.push(Statement.new(:not))
end
else
if new_words[-1].is_a?(Statement) && new_words[-1].operator == :not && new_words[-1].words.count == 0
new_words[-1].words.push(word)
else
new_words.push(word)
end
end
end
@words = new_words
end
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#expand_or ⇒ Object
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# File 'lib/codgen/statement.rb', line 132
def expand_or
new_words = Array.new
index = -1
skip = false
@words.each do |word|
index+=1
if skip
skip = false
next
end
if word.is_a?(Statement)
new_words.push(word)
elsif word.index(/or|\|/)
if new_words.count > 0 && @words.count > index + 1
left = new_words[-1]
new_words.delete_at(-1)
new_words.push(Statement.new(:or))
new_words[-1].words.push(left)
new_words[-1].words.push(@words[index+1])
skip = true
next
else
throw 'Operator must have a left and a right side'
end
else
new_words.push(word)
end
end
@words = new_words
end
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#parse(text) ⇒ Object
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# File 'lib/codgen/statement.rb', line 54
def parse(text)
count = -1
text.each_char do |current_char|
count+=1
if current_char == ' '
next 1
end
if current_char.index(IDENTIFIER_REGEX)
if @words.length > 0 && @words[-1].index(IDENTIFIER_REGEX)
@words[-1] = @words[-1] + current_char
else
@words.push(current_char)
end
elsif current_char.index(/[&|!]/)
@words.push(current_char)
elsif current_char == '('
@words.push(Statement.new)
count += @words[-1].parse(text[count...text.length])
elsif current_char == ')'
return count
end
end
end
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