Documentation
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Overview ¶
Package codetable provides the underlying byte-level code table structures used by DEC VT series terminals. A code table is a 16x16 matrix where each position corresponds to a single byte value (0x00-0xFF). The table is divided into control code regions (C0, C1) and graphic code regions (GL, GR).
Index ¶
Constants ¶
const ( // Column 0 C00R00 byte = 0b0000_0000 + iota C00R01 C00R02 C00R03 C00R04 C00R05 C00R06 C00R07 C00R08 C00R09 C00R10 C00R11 C00R12 C00R13 C00R14 C00R15 // Column 1 C01R00 C01R01 C01R02 C01R03 C01R04 C01R05 C01R06 C01R07 C01R08 C01R09 C01R10 C01R11 C01R12 C01R13 C01R14 C01R15 // Column 2 C02R00 C02R01 C02R02 C02R03 C02R04 C02R05 C02R06 C02R07 C02R08 C02R09 C02R10 C02R11 C02R12 C02R13 C02R14 C02R15 // Column 3 C03R00 C03R01 C03R02 C03R03 C03R04 C03R05 C03R06 C03R07 C03R08 C03R09 C03R10 C03R11 C03R12 C03R13 C03R14 C03R15 // Column 4 C04R00 C04R01 C04R02 C04R03 C04R04 C04R05 C04R06 C04R07 C04R08 C04R09 C04R10 C04R11 C04R12 C04R13 C04R14 C04R15 // Column 5 C05R00 C05R01 C05R02 C05R03 C05R04 C05R05 C05R06 C05R07 C05R08 C05R09 C05R10 C05R11 C05R12 C05R13 C05R14 C05R15 // Column 6 C06R00 C06R01 C06R02 C06R03 C06R04 C06R05 C06R06 C06R07 C06R08 C06R09 C06R10 C06R11 C06R12 C06R13 C06R14 C06R15 // Column 7 C07R00 C07R01 C07R02 C07R03 C07R04 C07R05 C07R06 C07R07 C07R08 C07R09 C07R10 C07R11 C07R12 C07R13 C07R14 C07R15 // Column 8 C08R00 C08R01 C08R02 C08R03 C08R04 C08R05 C08R06 C08R07 C08R08 C08R09 C08R10 C08R11 C08R12 C08R13 C08R14 C08R15 // Column 9 C09R00 C09R01 C09R02 C09R03 C09R04 C09R05 C09R06 C09R07 C09R08 C09R09 C09R10 C09R11 C09R12 C09R13 C09R14 C09R15 // Column 10 C10R00 C10R01 C10R02 C10R03 C10R04 C10R05 C10R06 C10R07 C10R08 C10R09 C10R10 C10R11 C10R12 C10R13 C10R14 C10R15 // Column 11 C11R00 C11R01 C11R02 C11R03 C11R04 C11R05 C11R06 C11R07 C11R08 C11R09 C11R10 C11R11 C11R12 C11R13 C11R14 C11R15 // Column 12 C12R00 C12R01 C12R02 C12R03 C12R04 C12R05 C12R06 C12R07 C12R08 C12R09 C12R10 C12R11 C12R12 C12R13 C12R14 C12R15 // Column 13 C13R00 C13R01 C13R02 C13R03 C13R04 C13R05 C13R06 C13R07 C13R08 C13R09 C13R10 C13R11 C13R12 C13R13 C13R14 C13R15 // Column 14 C14R00 C14R01 C14R02 C14R03 C14R04 C14R05 C14R06 C14R07 C14R08 C14R09 C14R10 C14R11 C14R12 C14R13 C14R14 C14R15 // Column 15 C15R00 C15R01 C15R02 C15R03 C15R04 C15R05 C15R06 C15R07 C15R08 C15R09 C15R10 C15R11 C15R12 C15R13 C15R14 C15R15 )
const ( C1 = "C1" GR = "GR" )
const ( C0 = "C0" GL = "GL" )
const ( // CodeSpaceRowCount is the number of rows in each code table column (16). CodeSpaceRowCount = 16 // ControlCodeSpaceColumnCount is the number of columns in a control code // space (2, for C0 columns 0-1 or C1 columns 8-9). ControlCodeSpaceColumnCount = 2 // GraphicCodeSpaceColumnCount is the number of columns in a graphic code // space (6, for GL columns 2-7 or GR columns 10-15). GraphicCodeSpaceColumnCount = 6 )
Variables ¶
var C0Table = ControlCodeSpace{ // contains filtered or unexported fields }
var C1Table = ControlCodeSpace{ // contains filtered or unexported fields }
var ( // ErrOutOfBounds is returned when attempting to access a code table position // outside the valid range. ErrOutOfBounds = errors.New("Coordinates out of bounds") )
var GLTable = GraphicCodeSpace{ // contains filtered or unexported fields }
var GRTable = GraphicCodeSpace{ // contains filtered or unexported fields }
Functions ¶
This section is empty.
Types ¶
type CodeSpace ¶
CodeSpace is the interface implemented by both ControlCodeSpace and GraphicCodeSpace, providing access to byte values at code table positions.
type ControlCodeSpace ¶
type ControlCodeSpace struct {
// contains filtered or unexported fields
}
ControlCodeSpace represents a control character region of the code table (C0 for columns 0-1, or C1 for columns 8-9). Control characters are non-printable characters used for terminal control functions.
func (ControlCodeSpace) Columns ¶
func (t ControlCodeSpace) Columns() int
Columns returns the number of columns in this code space.
func (ControlCodeSpace) Get ¶
func (t ControlCodeSpace) Get(row, col int) (byte, error)
Get returns the byte value at the specified row and column position. Row must be 0-15, column must be 0-1. Returns ErrOutOfBounds if the coordinates are outside the valid range.
func (ControlCodeSpace) ID ¶
func (t ControlCodeSpace) ID() string
ID returns the identifier string for this code space (e.g., "C0" or "C1").
type GraphicCodeSpace ¶
type GraphicCodeSpace struct {
// contains filtered or unexported fields
}
GraphicCodeSpace represents a graphic character region of the code table (GL for columns 2-7, or GR for columns 10-15). Graphic characters are printable characters including letters, numbers, and symbols.
func (GraphicCodeSpace) ColumnOffset ¶
func (t GraphicCodeSpace) ColumnOffset() int
ColumnOffset returns the starting column number for this code space (2 for GL, 10 for GR). This is derived from the high nibble of the first byte in the table.
func (GraphicCodeSpace) Columns ¶
func (t GraphicCodeSpace) Columns() int
Columns returns the number of columns in this code space.
func (GraphicCodeSpace) Get ¶
func (t GraphicCodeSpace) Get(row, col int) (byte, error)
Get returns the byte value at the specified row and column position. Row must be 0-15, column must be 0-5. Returns ErrOutOfBounds if the coordinates are outside the valid range.
func (GraphicCodeSpace) ID ¶
func (t GraphicCodeSpace) ID() string
ID returns the identifier string for this code space (e.g., "GL" or "GR").
Source Files