chore: vendor

vendor/github.com/charmbracelet/x/ansi/csi.go

@@ -0,0 +1,141 @@
+package ansi
+
+import (
+	"bytes"
+	"strconv"
+
+	"github.com/charmbracelet/x/ansi/parser"
+)
+
+// CsiSequence represents a control sequence introducer (CSI) sequence.
+//
+// The sequence starts with a CSI sequence, CSI (0x9B) in a 8-bit environment
+// or ESC [ (0x1B 0x5B) in a 7-bit environment, followed by any number of
+// parameters in the range of 0x30-0x3F, then by any number of intermediate
+// byte in the range of 0x20-0x2F, then finally with a single final byte in the
+// range of 0x20-0x7E.
+//
+//	CSI P..P I..I F
+//
+// See ECMA-48 § 5.4.
+type CsiSequence struct {
+	// Params contains the raw parameters of the sequence.
+	// This is a slice of integers, where each integer is a 32-bit integer
+	// containing the parameter value in the lower 31 bits and a flag in the
+	// most significant bit indicating whether there are more sub-parameters.
+	Params []int
+
+	// Cmd contains the raw command of the sequence.
+	// The command is a 32-bit integer containing the CSI command byte in the
+	// lower 8 bits, the private marker in the next 8 bits, and the intermediate
+	// byte in the next 8 bits.
+	//
+	//  CSI ? u
+	//
+	// Is represented as:
+	//
+	//  'u' | '?' << 8
+	Cmd int
+}
+
+var _ Sequence = CsiSequence{}
+
+// Marker returns the marker byte of the CSI sequence.
+// This is always gonna be one of the following '<' '=' '>' '?' and in the
+// range of 0x3C-0x3F.
+// Zero is returned if the sequence does not have a marker.
+func (s CsiSequence) Marker() int {
+	return parser.Marker(s.Cmd)
+}
+
+// Intermediate returns the intermediate byte of the CSI sequence.
+// An intermediate byte is in the range of 0x20-0x2F. This includes these
+// characters from ' ', '!', '"', '#', '$', '%', '&', ”', '(', ')', '*', '+',
+// ',', '-', '.', '/'.
+// Zero is returned if the sequence does not have an intermediate byte.
+func (s CsiSequence) Intermediate() int {
+	return parser.Intermediate(s.Cmd)
+}
+
+// Command returns the command byte of the CSI sequence.
+func (s CsiSequence) Command() int {
+	return parser.Command(s.Cmd)
+}
+
+// Param returns the parameter at the given index.
+// It returns -1 if the parameter does not exist.
+func (s CsiSequence) Param(i int) int {
+	return parser.Param(s.Params, i)
+}
+
+// HasMore returns true if the parameter has more sub-parameters.
+func (s CsiSequence) HasMore(i int) bool {
+	return parser.HasMore(s.Params, i)
+}
+
+// Subparams returns the sub-parameters of the given parameter.
+// It returns nil if the parameter does not exist.
+func (s CsiSequence) Subparams(i int) []int {
+	return parser.Subparams(s.Params, i)
+}
+
+// Len returns the number of parameters in the sequence.
+// This will return the number of parameters in the sequence, excluding any
+// sub-parameters.
+func (s CsiSequence) Len() int {
+	return parser.Len(s.Params)
+}
+
+// Range iterates over the parameters of the sequence and calls the given
+// function for each parameter.
+// The function should return false to stop the iteration.
+func (s CsiSequence) Range(fn func(i int, param int, hasMore bool) bool) {
+	parser.Range(s.Params, fn)
+}
+
+// Clone returns a copy of the CSI sequence.
+func (s CsiSequence) Clone() Sequence {
+	return CsiSequence{
+		Params: append([]int(nil), s.Params...),
+		Cmd:    s.Cmd,
+	}
+}
+
+// String returns a string representation of the sequence.
+// The string will always be in the 7-bit format i.e (ESC [ P..P I..I F).
+func (s CsiSequence) String() string {
+	return s.buffer().String()
+}
+
+// buffer returns a buffer containing the sequence.
+func (s CsiSequence) buffer() *bytes.Buffer {
+	var b bytes.Buffer
+	b.WriteString("\x1b[")
+	if m := s.Marker(); m != 0 {
+		b.WriteByte(byte(m))
+	}
+	s.Range(func(i, param int, hasMore bool) bool {
+		if param >= 0 {
+			b.WriteString(strconv.Itoa(param))
+		}
+		if i < len(s.Params)-1 {
+			if hasMore {
+				b.WriteByte(':')
+			} else {
+				b.WriteByte(';')
+			}
+		}
+		return true
+	})
+	if i := s.Intermediate(); i != 0 {
+		b.WriteByte(byte(i))
+	}
+	b.WriteByte(byte(s.Command()))
+	return &b
+}
+
+// Bytes returns the byte representation of the sequence.
+// The bytes will always be in the 7-bit format i.e (ESC [ P..P I..I F).
+func (s CsiSequence) Bytes() []byte {
+	return s.buffer().Bytes()
+}