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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| package ansi | ||
|
|
||
| import ( | ||
| "regexp" | ||
| "strconv" | ||
|
|
||
| "github.com/charmbracelet/x/exp/term/input" | ||
| ) | ||
|
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| var mouseSGRRegex = regexp.MustCompile(`(\d+);(\d+);(\d+)([Mm])`) | ||
|
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| // Parse SGR-encoded mouse events; SGR extended mouse events. SGR mouse events | ||
| // look like: | ||
| // | ||
| // ESC [ < Cb ; Cx ; Cy (M or m) | ||
| // | ||
| // where: | ||
| // | ||
| // Cb is the encoded button code | ||
| // Cx is the x-coordinate of the mouse | ||
| // Cy is the y-coordinate of the mouse | ||
| // M is for button press, m is for button release | ||
| // | ||
| // https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Extended-coordinates | ||
| func parseSGRMouseEvent(buf []byte) input.MouseEvent { | ||
| str := string(buf[3:]) | ||
| matches := mouseSGRRegex.FindStringSubmatch(str) | ||
| if len(matches) != 5 { | ||
| // Unreachable, we already checked the regex in `detectOneMsg`. | ||
| panic("invalid mouse event") | ||
| } | ||
|
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| b, _ := strconv.Atoi(matches[1]) | ||
| px := matches[2] | ||
| py := matches[3] | ||
| release := matches[4] == "m" | ||
| m := parseMouseButton(b, true) | ||
|
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| // Wheel buttons don't have release events | ||
| // Motion can be reported as a release event in some terminals (Windows Terminal) | ||
| if m.Action != input.MouseActionMotion && !m.IsWheel() && release { | ||
| m.Action = input.MouseActionRelease | ||
| } | ||
|
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| x, _ := strconv.Atoi(px) | ||
| y, _ := strconv.Atoi(py) | ||
|
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| // (1,1) is the upper left. We subtract 1 to normalize it to (0,0). | ||
| m.X = x - 1 | ||
| m.Y = y - 1 | ||
|
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| return m | ||
| } | ||
|
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| const x10MouseByteOffset = 32 | ||
|
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| // Parse X10-encoded mouse events; the simplest kind. The last release of X10 | ||
| // was December 1986, by the way. The original X10 mouse protocol limits the Cx | ||
| // and Cy coordinates to 223 (=255-032). | ||
| // | ||
| // X10 mouse events look like: | ||
| // | ||
| // ESC [M Cb Cx Cy | ||
| // | ||
| // See: http://www.xfree86.org/current/ctlseqs.html#Mouse%20Tracking | ||
| func parseX10MouseEvent(buf []byte) input.MouseEvent { | ||
| v := buf[3:6] | ||
| m := parseMouseButton(int(v[0]), false) | ||
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| // (1,1) is the upper left. We subtract 1 to normalize it to (0,0). | ||
| m.X = int(v[1]) - x10MouseByteOffset - 1 | ||
| m.Y = int(v[2]) - x10MouseByteOffset - 1 | ||
|
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| return m | ||
| } | ||
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| // See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Extended-coordinates | ||
| func parseMouseButton(b int, isSGR bool) input.MouseEvent { | ||
| var m input.MouseEvent | ||
| e := b | ||
| if !isSGR { | ||
| e -= x10MouseByteOffset | ||
| } | ||
|
|
||
| const ( | ||
| bitShift = 0b0000_0100 | ||
| bitAlt = 0b0000_1000 | ||
| bitCtrl = 0b0001_0000 | ||
| bitMotion = 0b0010_0000 | ||
| bitWheel = 0b0100_0000 | ||
| bitAdd = 0b1000_0000 // additional buttons 8-11 | ||
|
|
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| bitsMask = 0b0000_0011 | ||
| ) | ||
|
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| if e&bitAdd != 0 { | ||
| m.Button = input.MouseButtonBackward + input.MouseButton(e&bitsMask) | ||
| } else if e&bitWheel != 0 { | ||
| m.Button = input.MouseButtonWheelUp + input.MouseButton(e&bitsMask) | ||
| } else { | ||
| m.Button = input.MouseButtonLeft + input.MouseButton(e&bitsMask) | ||
| // X10 reports a button release as 0b0000_0011 (3) | ||
| if e&bitsMask == bitsMask { | ||
| m.Action = input.MouseActionRelease | ||
| m.Button = input.MouseButtonNone | ||
| } | ||
| } | ||
|
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| // Motion bit doesn't get reported for wheel events. | ||
| if e&bitMotion != 0 && !m.IsWheel() { | ||
| m.Action = input.MouseActionMotion | ||
| } | ||
|
|
||
| // Modifiers | ||
| if e&bitAlt != 0 { | ||
| m.Mod |= input.Alt | ||
| } | ||
| if e&bitCtrl != 0 { | ||
| m.Mod |= input.Ctrl | ||
| } | ||
| if e&bitShift != 0 { | ||
| m.Mod |= input.Shift | ||
| } | ||
|
|
||
| return m | ||
| } |
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