feat: initial commit

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

@@ -0,0 +1,55 @@
+package ansi
+
+// SelectCharacterSet sets the G-set character designator to the specified
+// character set.
+//
+//	ESC Ps Pd
+//
+// Where Ps is the G-set character designator, and Pd is the identifier.
+// For 94-character sets, the designator can be one of:
+//   - ( G0
+//   - ) G1
+//   - * G2
+//   - + G3
+//
+// For 96-character sets, the designator can be one of:
+//   - - G1
+//   - . G2
+//   - / G3
+//
+// Some common 94-character sets are:
+//   - 0 DEC Special Drawing Set
+//   - A United Kingdom (UK)
+//   - B United States (USASCII)
+//
+// Examples:
+//
+//	ESC ( B  Select character set G0 = United States (USASCII)
+//	ESC ( 0  Select character set G0 = Special Character and Line Drawing Set
+//	ESC ) 0  Select character set G1 = Special Character and Line Drawing Set
+//	ESC * A  Select character set G2 = United Kingdom (UK)
+//
+// See: https://vt100.net/docs/vt510-rm/SCS.html
+func SelectCharacterSet(gset byte, charset byte) string {
+	return "\x1b" + string(gset) + string(charset)
+}
+
+// SCS is an alias for SelectCharacterSet.
+func SCS(gset byte, charset byte) string {
+	return SelectCharacterSet(gset, charset)
+}
+
+// LS1R (Locking Shift 1 Right) shifts G1 into GR character set.
+const LS1R = "\x1b~"
+
+// LS2 (Locking Shift 2) shifts G2 into GL character set.
+const LS2 = "\x1bn"
+
+// LS2R (Locking Shift 2 Right) shifts G2 into GR character set.
+const LS2R = "\x1b}"
+
+// LS3 (Locking Shift 3) shifts G3 into GL character set.
+const LS3 = "\x1bo"
+
+// LS3R (Locking Shift 3 Right) shifts G3 into GR character set.
+const LS3R = "\x1b|"