def _nt_bracket_expression
start_index = index
if node_cache[:bracket_expression].has_key?(index)
cached = node_cache[:bracket_expression][index]
if cached
cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
@index = cached.interval.end
end
return cached
end
i0, s0 = index, []
if has_terminal?('[:', false, index)
r1 = instantiate_node(SyntaxNode,input, index...(index + 2))
@index += 2
else
terminal_parse_failure('[:')
r1 = nil
end
s0 << r1
if r1
if has_terminal?('^', false, index)
r3 = instantiate_node(SyntaxNode,input, index...(index + 1))
@index += 1
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 has_terminal?('alnum', false, index)
r5 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('alnum')
r5 = nil
end
if r5
r4 = r5
else
if has_terminal?('alpha', false, index)
r6 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('alpha')
r6 = nil
end
if r6
r4 = r6
else
if has_terminal?('blank', false, index)
r7 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('blank')
r7 = nil
end
if r7
r4 = r7
else
if has_terminal?('cntrl', false, index)
r8 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('cntrl')
r8 = nil
end
if r8
r4 = r8
else
if has_terminal?('digit', false, index)
r9 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('digit')
r9 = nil
end
if r9
r4 = r9
else
if has_terminal?('graph', false, index)
r10 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('graph')
r10 = nil
end
if r10
r4 = r10
else
if has_terminal?('lower', false, index)
r11 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('lower')
r11 = nil
end
if r11
r4 = r11
else
if has_terminal?('print', false, index)
r12 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('print')
r12 = nil
end
if r12
r4 = r12
else
if has_terminal?('punct', false, index)
r13 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('punct')
r13 = nil
end
if r13
r4 = r13
else
if has_terminal?('space', false, index)
r14 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('space')
r14 = nil
end
if r14
r4 = r14
else
if has_terminal?('upper', false, index)
r15 = instantiate_node(SyntaxNode,input, index...(index + 5))
@index += 5
else
terminal_parse_failure('upper')
r15 = nil
end
if r15
r4 = r15
else
if has_terminal?('xdigit', false, index)
r16 = instantiate_node(SyntaxNode,input, index...(index + 6))
@index += 6
else
terminal_parse_failure('xdigit')
r16 = nil
end
if r16
r4 = r16
else
if has_terminal?('word', false, index)
r17 = instantiate_node(SyntaxNode,input, index...(index + 4))
@index += 4
else
terminal_parse_failure('word')
r17 = nil
end
if r17
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 has_terminal?(':]', false, index)
r18 = instantiate_node(SyntaxNode,input, index...(index + 2))
@index += 2
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