Parse cursor position reports

Author: SqlRush

docs/claude-code-go-rewrite-plan.md

@@ -409,6 +409,7 @@ test/parity/                 # golden tests against TS/official behavior
 - 本轮补充：terminal CSI parser 接受 DEC private mode `?1047h/l` alternate-screen buffer 和 `?1048h/l` save/restore cursor，复用已有 mode/cursor actions。
 - 本轮补充：terminal CSI parser 把 DECREQTPARM terminal-parameters (`CSI x`) 归入 report action，保留 code/private marker。
 - 本轮补充：terminal CSI parser 把 DECRQM mode request (`CSI Ps $ p` / `CSI ? Ps $ p`) 归入 report action，保留 mode code 和 DEC private marker。
+- 本轮补充：terminal CSI parser 把 CPR cursor-position responses (`CSI row;col R` / DEC private `CSI ? row;col R`) 归入 report action，结构化暴露 row/column 并保持 visible-text stripping。
 - 本轮补充：terminal CSI parser 把 xterm window manipulation/report (`CSI t`) 归入 report action，覆盖常见 `CSI 14t`/`CSI 18t` 查询，并把 `CSI 4;height;width t` 与 `CSI 8;rows;cols t` 的 pixel/text-area 尺寸参数结构化暴露。
 - 本轮补充：terminal CSI parser 把 DECRPM mode status report (`CSI Ps;Ps $ y` / `CSI ? Ps;Ps $ y`) 归入 report action，保留 mode code、status 和 DEC private marker。
 - 本轮补充：terminal CSI parser 把 TBC tab-clear (`CSI g`/`CSI 3g`) 归入 cursor action，保留 clear-current/all code。

docs/first-second-parity-audit.md

@@ -323,6 +323,7 @@ M7 progress now includes:
 - `internal/tui`: terminal CSI parsing now accepts multi-parameter mode set/reset sequences such as `CSI ?1000;1006;2004h` and exposes the full mode list while preserving the first mode for existing single-mode callers.
 - `internal/tui`: terminal CSI parser now emits structured edit actions for insert/delete chars and insert/delete lines, plus forward/back tab cursor actions; output `CSI M` is parsed as delete-lines while input tokenization still keeps X10 mouse payload handling separate.
 - `internal/tui`: terminal CSI parser now emits report actions for DSR `CSI n`, including device-status, cursor-position, and private-mode unknown reports.
+- `internal/tui`: terminal CSI parser now emits report actions for CPR cursor-position responses such as `CSI row;col R` and DEC private `CSI ? row;col R`, preserving row/column metadata while keeping visible text clean.
 - `internal/tui`: terminal sequence dispatcher and parser now classify DCS/APC/PM/SOS string-control sequences as `stringControl` actions with payload, terminator, and incomplete-flush state while keeping visible text extraction free of those invisible payloads.
 - `internal/tui`: terminal CSI parser now recognizes DEC X10, highlight, UTF-8, urxvt numeric, and xterm SGR-pixels mouse modes (`?9h/l`, `?1001h/l`, `?1005h/l`, `?1015h/l`, `?1016h/l`) as mouse-tracking mode actions.
 - `internal/tui`: terminal CSI parser now recognizes xterm alternate scroll mode (`?1007h/l`) as a structured mode action instead of an unknown sequence.

internal/tui/terminal_csi.go

@@ -41,6 +41,7 @@ const (
 	CSICommandEraseField       byte = 'N'
 	CSICommandEraseArea        byte = 'O'
 	CSICommandDeleteCharacters byte = 'P'
+	CSICommandCursorPosReport  byte = 'R'
 	CSICommandEraseCharacters  byte = 'X'
 	CSICommandBackwardTab      byte = 'Z'
 	CSICommandScrollUp         byte = 'S'
@@ -235,6 +236,8 @@ type CSIReportAction struct {
 	Width       int
 	Rows        int
 	Columns     int
+	Row         int
+	Column      int
 }
 
 type CSIScrollActionType string
@@ -456,6 +459,8 @@ func ParseCSISequence(sequence string) (CSIAction, bool) {
 		return csiEdit(CSIEditActionInsertChars, p0), true
 	case CSICommandDeleteCharacters:
 		return csiEdit(CSIEditActionDeleteChars, p0), true
+	case CSICommandCursorPosReport:
+		return csiCursorPositionReport(p0, p1, privateMode), true
 	case CSICommandInsertLines:
 		return csiEdit(CSIEditActionInsertLines, p0), true
 	case CSICommandDeleteLines:
@@ -585,6 +590,18 @@ func csiReport(code int, privateMode byte) CSIAction {
 	}
 }
 
+func csiCursorPositionReport(row int, column int, privateMode byte) CSIAction {
+	return CSIAction{
+		Type: CSIActionReport,
+		Report: CSIReportAction{
+			Type:        CSIReportActionCursorPosition,
+			PrivateMode: privateMode,
+			Row:         row,
+			Column:      column,
+		},
+	}
+}
+
 func csiDeviceAttributes(code int, privateMode byte) CSIAction {
 	return CSIAction{
 		Type:   CSIActionReport,

internal/tui/terminal_parser_test.go

@@ -461,6 +461,21 @@ func TestTerminalParserDispatchesWindowResizeReports(t *testing.T) {
 	}
 }
 
+func TestTerminalParserDispatchesCursorPositionReports(t *testing.T) {
+	parser := NewTerminalParser()
+	input := "a" + CSISequence(12, 34, "R") + "b"
+	actions := parser.Feed(input)
+	if len(actions) != 3 {
+		t.Fatalf("actions = %#v", actions)
+	}
+	if actions[1].Type != TerminalActionReport || actions[1].Report.Type != CSIReportActionCursorPosition || actions[1].Report.Row != 12 || actions[1].Report.Column != 34 {
+		t.Fatalf("cursor position report action = %#v", actions[1])
+	}
+	if got := TerminalVisibleText(input); got != "ab" {
+		t.Fatalf("visible = %q", got)
+	}
+}
+
 func TestTerminalParserUsesOutputTokenizerForCSIM(t *testing.T) {
 	parser := NewTerminalParser()
 	actions := parser.Feed("\x1b[M`rK")

internal/tui/tui_test.go

@@ -5279,6 +5279,9 @@ func TestParseCSISequenceActions(t *testing.T) {
 		{seq: CSISequence(6, "n"), want: CSIReportAction{Type: CSIReportActionCursorPosition, Code: 6}},
 		{seq: CSISequence(0, "n"), want: CSIReportAction{Type: CSIReportActionUnknown, Code: 0}},
 		{seq: CSISequence("?25n"), want: CSIReportAction{Type: CSIReportActionUnknown, Code: 25, PrivateMode: '?'}},
+		{seq: CSISequence(12, 34, "R"), want: CSIReportAction{Type: CSIReportActionCursorPosition, Row: 12, Column: 34}},
+		{seq: CSISequence("0;0R"), want: CSIReportAction{Type: CSIReportActionCursorPosition, Row: 1, Column: 1}},
+		{seq: CSISequence("?7;8R"), want: CSIReportAction{Type: CSIReportActionCursorPosition, PrivateMode: '?', Row: 7, Column: 8}},
 		{seq: CSISequence("4$p"), want: CSIReportAction{Type: CSIReportActionModeRequest, Code: 4}},
 		{seq: CSISequence("?25$p"), want: CSIReportAction{Type: CSIReportActionModeRequest, Code: 25, PrivateMode: '?'}},
 		{seq: CSISequence("4;1$y"), want: CSIReportAction{Type: CSIReportActionModeStatus, Code: 4, Status: 1}},