// 

// Copyright (c) 2011-2019 Canonical Ltd

// Copyright (c) 2006-2010 Kirill Simonov

// 

// Permission is hereby granted, free of charge, to any person obtaining a copy of

// this software and associated documentation files (the "Software"), to deal in

// the Software without restriction, including without limitation the rights to

// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies

// of the Software, and to permit persons to whom the Software is furnished to do

// so, subject to the following conditions:

// 

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

// 

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

// SOFTWARE.

package yaml

const (

	// The size of the input raw buffer.

	input_raw_buffer_size = 512

	// The size of the input buffer.

	// It should be possible to decode the whole raw buffer.

	input_buffer_size = input_raw_buffer_size * 3

	// The size of the output buffer.

	output_buffer_size = 128

	// The size of the output raw buffer.

	// It should be possible to encode the whole output buffer.

	output_raw_buffer_size = (output_buffer_size*2 + 2)

	// The size of other stacks and queues.

	initial_stack_size  = 16

	initial_queue_size  = 16

	initial_string_size = 16

)

// Check if the character at the specified position is an alphabetical

// character, a digit, '_', or '-'.

func is_alpha(b []byte, i int) bool {

	return b[i] >= '0' && b[i] <= '9' || b[i] >= 'A' && b[i] <= 'Z' || b[i] >= 'a' && b[i] <= 'z' || b[i] == '_' || b[i] == '-'

}

// Check if the character at the specified position is a digit.

func is_digit(b []byte, i int) bool {

	return b[i] >= '0' && b[i] <= '9'

}

// Get the value of a digit.

func as_digit(b []byte, i int) int {

	return int(b[i]) - '0'

}

// Check if the character at the specified position is a hex-digit.

func is_hex(b []byte, i int) bool {

	return b[i] >= '0' && b[i] <= '9' || b[i] >= 'A' && b[i] <= 'F' || b[i] >= 'a' && b[i] <= 'f'

}

// Get the value of a hex-digit.

func as_hex(b []byte, i int) int {

	bi := b[i]

	if bi >= 'A' && bi <= 'F' {

		return int(bi) - 'A' + 10

	}

	if bi >= 'a' && bi <= 'f' {

		return int(bi) - 'a' + 10

	}

	return int(bi) - '0'

}

// Check if the character is ASCII.

func is_ascii(b []byte, i int) bool {

	return b[i] <= 0x7F

}

// Check if the character at the start of the buffer can be printed unescaped.

func is_printable(b []byte, i int) bool {

	return ((b[i] == 0x0A) || // . == #x0A

		(b[i] >= 0x20 && b[i] <= 0x7E) || // #x20 <= . <= #x7E

		(b[i] == 0xC2 && b[i+1] >= 0xA0) || // #0xA0 <= . <= #xD7FF

		(b[i] > 0xC2 && b[i] < 0xED) ||

		(b[i] == 0xED && b[i+1] < 0xA0) ||

		(b[i] == 0xEE) ||

		(b[i] == 0xEF && // #xE000 <= . <= #xFFFD

			!(b[i+1] == 0xBB && b[i+2] == 0xBF) && // && . != #xFEFF

			!(b[i+1] == 0xBF && (b[i+2] == 0xBE || b[i+2] == 0xBF))))

}

// Check if the character at the specified position is NUL.

func is_z(b []byte, i int) bool {

	return b[i] == 0x00

}

// Check if the beginning of the buffer is a BOM.

func is_bom(b []byte, i int) bool {

	return b[0] == 0xEF && b[1] == 0xBB && b[2] == 0xBF

}

// Check if the character at the specified position is space.

func is_space(b []byte, i int) bool {

	return b[i] == ' '

}

// Check if the character at the specified position is tab.

func is_tab(b []byte, i int) bool {

	return b[i] == '\t'

}

// Check if the character at the specified position is blank (space or tab).

func is_blank(b []byte, i int) bool {

	//return is_space(b, i) || is_tab(b, i)

	return b[i] == ' ' || b[i] == '\t'

}

// Check if the character at the specified position is a line break.

func is_break(b []byte, i int) bool {

	return (b[i] == '\r' || // CR (#xD)

		b[i] == '\n' || // LF (#xA)

		b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)

		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)

		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9) // PS (#x2029)

}

func is_crlf(b []byte, i int) bool {

	return b[i] == '\r' && b[i+1] == '\n'

}

// Check if the character is a line break or NUL.

func is_breakz(b []byte, i int) bool {

	//return is_break(b, i) || is_z(b, i)

	return (

		// is_break:

		b[i] == '\r' || // CR (#xD)

		b[i] == '\n' || // LF (#xA)

		b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)

		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)

		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029)

		// is_z:

		b[i] == 0)

}

// Check if the character is a line break, space, or NUL.

func is_spacez(b []byte, i int) bool {

	//return is_space(b, i) || is_breakz(b, i)

	return (

		// is_space:

		b[i] == ' ' ||

		// is_breakz:

		b[i] == '\r' || // CR (#xD)

		b[i] == '\n' || // LF (#xA)

		b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)

		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)

		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029)

		b[i] == 0)

}

// Check if the character is a line break, space, tab, or NUL.

func is_blankz(b []byte, i int) bool {

	//return is_blank(b, i) || is_breakz(b, i)

	return (

		// is_blank:

		b[i] == ' ' || b[i] == '\t' ||

		// is_breakz:

		b[i] == '\r' || // CR (#xD)

		b[i] == '\n' || // LF (#xA)

		b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)

		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)

		b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029)

		b[i] == 0)

}

// Determine the width of the character.

func width(b byte) int {

	// Don't replace these by a switch without first

	// confirming that it is being inlined.

	if b&0x80 == 0x00 {

		return 1

	}

	if b&0xE0 == 0xC0 {

		return 2

	}

	if b&0xF0 == 0xE0 {

		return 3

	}

	if b&0xF8 == 0xF0 {

		return 4

	}

	return 0

}