source: code/trunk/vendor/gopkg.in/yaml.v3/yamlprivateh.go@ 75

// 
// 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

}