def _nt_bracket_expression
start_index = index
if node_cache[:bracket_expression].has_key?(index)
cached = node_cache[:bracket_expression][index]
if cached
node_cache[:bracket_expression][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
@index = cached.interval.end
end
return cached
end
i0, s0 = index, []
if (match_len = has_terminal?('[:', false, index))
r1 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'[:\'')
r1 = nil
end
s0 << r1
if r1
if (match_len = has_terminal?('^', false, index))
r3 = true
@index += match_len
else
terminal_parse_failure('\'^\'')
r3 = nil
end
if r3
r2 = r3
else
r2 = instantiate_node(SyntaxNode,input, index...index)
end
s0 << r2
if r2
i4 = index
if (match_len = has_terminal?('alnum', false, index))
r5 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'alnum\'')
r5 = nil
end
if r5
r5 = SyntaxNode.new(input, (index-1)...index) if r5 == true
r4 = r5
else
if (match_len = has_terminal?('alpha', false, index))
r6 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'alpha\'')
r6 = nil
end
if r6
r6 = SyntaxNode.new(input, (index-1)...index) if r6 == true
r4 = r6
else
if (match_len = has_terminal?('blank', false, index))
r7 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'blank\'')
r7 = nil
end
if r7
r7 = SyntaxNode.new(input, (index-1)...index) if r7 == true
r4 = r7
else
if (match_len = has_terminal?('cntrl', false, index))
r8 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'cntrl\'')
r8 = nil
end
if r8
r8 = SyntaxNode.new(input, (index-1)...index) if r8 == true
r4 = r8
else
if (match_len = has_terminal?('digit', false, index))
r9 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'digit\'')
r9 = nil
end
if r9
r9 = SyntaxNode.new(input, (index-1)...index) if r9 == true
r4 = r9
else
if (match_len = has_terminal?('graph', false, index))
r10 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'graph\'')
r10 = nil
end
if r10
r10 = SyntaxNode.new(input, (index-1)...index) if r10 == true
r4 = r10
else
if (match_len = has_terminal?('lower', false, index))
r11 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'lower\'')
r11 = nil
end
if r11
r11 = SyntaxNode.new(input, (index-1)...index) if r11 == true
r4 = r11
else
if (match_len = has_terminal?('print', false, index))
r12 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'print\'')
r12 = nil
end
if r12
r12 = SyntaxNode.new(input, (index-1)...index) if r12 == true
r4 = r12
else
if (match_len = has_terminal?('punct', false, index))
r13 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'punct\'')
r13 = nil
end
if r13
r13 = SyntaxNode.new(input, (index-1)...index) if r13 == true
r4 = r13
else
if (match_len = has_terminal?('space', false, index))
r14 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'space\'')
r14 = nil
end
if r14
r14 = SyntaxNode.new(input, (index-1)...index) if r14 == true
r4 = r14
else
if (match_len = has_terminal?('upper', false, index))
r15 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'upper\'')
r15 = nil
end
if r15
r15 = SyntaxNode.new(input, (index-1)...index) if r15 == true
r4 = r15
else
if (match_len = has_terminal?('xdigit', false, index))
r16 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'xdigit\'')
r16 = nil
end
if r16
r16 = SyntaxNode.new(input, (index-1)...index) if r16 == true
r4 = r16
else
if (match_len = has_terminal?('word', false, index))
r17 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\'word\'')
r17 = nil
end
if r17
r17 = SyntaxNode.new(input, (index-1)...index) if r17 == true
r4 = r17
else
@index = i4
r4 = nil
end
end
end
end
end
end
end
end
end
end
end
end
end
s0 << r4
if r4
if (match_len = has_terminal?(':]', false, index))
r18 = instantiate_node(SyntaxNode,input, index...(index + match_len))
@index += match_len
else
terminal_parse_failure('\':]\'')
r18 = nil
end
s0 << r18
end
end
end
if s0.last
r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
r0.extend(BracketExpression0)
else
@index = i0
r0 = nil
end
node_cache[:bracket_expression][start_index] = r0
r0
end