1 files changed, 292 insertions, 0 deletions
diff --git a/src/nvim/vterm/vterm_internal_defs.h b/src/nvim/vterm/vterm_internal_defs.h
new file mode 100644
index 0000000000..19e809490f
--- /dev/null
+++ b/src/nvim/vterm/vterm_internal_defs.h
@@ -0,0 +1,292 @@
+#pragma once
+
+#include <stdarg.h>
+
+#include "nvim/mbyte_defs.h"
+#include "nvim/vterm/vterm_defs.h"
+
+#ifdef DEBUG
+# define DEBUG_LOG(...) fprintf(stderr, __VA_ARGS__)
+#else
+# define DEBUG_LOG(...)
+#endif
+
+#define ESC_S "\x1b"
+
+#define INTERMED_MAX 16
+
+#define CSI_ARGS_MAX 16
+#define CSI_LEADER_MAX 16
+
+#define BUFIDX_PRIMARY   0
+#define BUFIDX_ALTSCREEN 1
+
+#define KEY_ENCODING_DISAMBIGUATE 0x1
+#define KEY_ENCODING_REPORT_EVENTS 0x2
+#define KEY_ENCODING_REPORT_ALTERNATE 0x4
+#define KEY_ENCODING_REPORT_ALL_KEYS 0x8
+#define KEY_ENCODING_REPORT_ASSOCIATED 0x10
+
+typedef struct VTermEncoding VTermEncoding;
+typedef struct VTermKeyEncodingFlags VTermKeyEncodingFlags;
+
+typedef struct {
+  VTermEncoding *enc;
+
+  // This size should be increased if required by other stateful encodings
+  char data[4 * sizeof(uint32_t)];
+} VTermEncodingInstance;
+
+struct VTermPen {
+  VTermColor fg;
+  VTermColor bg;
+  int uri;
+  unsigned bold:1;
+  unsigned underline:2;
+  unsigned italic:1;
+  unsigned blink:1;
+  unsigned reverse:1;
+  unsigned conceal:1;
+  unsigned strike:1;
+  unsigned font:4;  // To store 0-9
+  unsigned small:1;
+  unsigned baseline:2;
+};
+
+// https://sw.kovidgoyal.net/kitty/keyboard-protocol/#progressive-enhancement
+struct VTermKeyEncodingFlags {
+  bool disambiguate:1;
+  bool report_events:1;
+  bool report_alternate:1;
+  bool report_all_keys:1;
+  bool report_associated:1;
+};
+
+struct VTermKeyEncodingStack {
+  VTermKeyEncodingFlags items[16];
+  uint8_t size;  ///< Number of items in the stack. This is at least 1 and at
+                 ///< most the length of the "items" array.
+};
+
+struct VTermState {
+  VTerm *vt;
+
+  const VTermStateCallbacks *callbacks;
+  void *cbdata;
+
+  const VTermStateFallbacks *fallbacks;
+  void *fbdata;
+
+  int rows;
+  int cols;
+
+  // Current cursor position
+  VTermPos pos;
+
+  int at_phantom;  // True if we're on the "81st" phantom column to defer a wraparound
+
+  int scrollregion_top;
+  int scrollregion_bottom;  // -1 means unbounded
+#define SCROLLREGION_BOTTOM(state) ((state)->scrollregion_bottom > \
+                                    -1 ? (state)->scrollregion_bottom : (state)->rows)
+  int scrollregion_left;
+#define SCROLLREGION_LEFT(state)  ((state)->mode.leftrightmargin ? (state)->scrollregion_left : 0)
+  int scrollregion_right;  // -1 means unbounded
+#define SCROLLREGION_RIGHT(state) ((state)->mode.leftrightmargin \
+                                   && (state)->scrollregion_right > \
+                                   -1 ? (state)->scrollregion_right : (state)->cols)
+
+  // Bitvector of tab stops
+  uint8_t *tabstops;
+
+  // Primary and Altscreen; lineinfos[1] is lazily allocated as needed
+  VTermLineInfo *lineinfos[2];
+
+  // lineinfo will == lineinfos[0] or lineinfos[1], depending on altscreen
+  VTermLineInfo *lineinfo;
+#define ROWWIDTH(state, \
+                 row) ((state)->lineinfo[(row)].doublewidth ? ((state)->cols / 2) : (state)->cols)
+#define THISROWWIDTH(state) ROWWIDTH(state, (state)->pos.row)
+
+  // Mouse state
+  int mouse_col, mouse_row;
+  int mouse_buttons;
+  int mouse_flags;
+#define MOUSE_WANT_CLICK 0x01
+#define MOUSE_WANT_DRAG  0x02
+#define MOUSE_WANT_MOVE  0x04
+
+  enum { MOUSE_X10, MOUSE_UTF8, MOUSE_SGR, MOUSE_RXVT, } mouse_protocol;
+
+// Last glyph output, for Unicode recombining purposes
+  char grapheme_buf[MAX_SCHAR_SIZE];
+  size_t grapheme_len;
+  uint32_t grapheme_last;  // last added UTF-32 char
+  GraphemeState grapheme_state;
+  int combine_width;  // The width of the glyph above
+  VTermPos combine_pos;   // Position before movement
+
+  struct {
+    unsigned keypad:1;
+    unsigned cursor:1;
+    unsigned autowrap:1;
+    unsigned insert:1;
+    unsigned newline:1;
+    unsigned cursor_visible:1;
+    unsigned cursor_blink:1;
+    unsigned cursor_shape:2;
+    unsigned alt_screen:1;
+    unsigned origin:1;
+    unsigned screen:1;
+    unsigned leftrightmargin:1;
+    unsigned bracketpaste:1;
+    unsigned report_focus:1;
+    unsigned theme_updates:1;
+  } mode;
+
+  VTermEncodingInstance encoding[4], encoding_utf8;
+  int gl_set, gr_set, gsingle_set;
+
+  struct VTermPen pen;
+
+  VTermColor default_fg;
+  VTermColor default_bg;
+  VTermColor colors[16];  // Store the 8 ANSI and the 8 ANSI high-brights only
+
+  int bold_is_highbright;
+
+  unsigned protected_cell : 1;
+
+// Saved state under DEC mode 1048/1049
+  struct {
+    VTermPos pos;
+    struct VTermPen pen;
+
+    struct {
+      unsigned cursor_visible:1;
+      unsigned cursor_blink:1;
+      unsigned cursor_shape:2;
+    } mode;
+  } saved;
+
+// Temporary state for DECRQSS parsing
+  union {
+    char decrqss[4];
+    struct {
+      uint16_t mask;
+      enum {
+        SELECTION_INITIAL,
+        SELECTION_SELECTED,
+        SELECTION_QUERY,
+        SELECTION_SET_INITIAL,
+        SELECTION_SET,
+        SELECTION_INVALID,
+      } state : 8;
+      uint32_t recvpartial;
+      uint32_t sendpartial;
+    } selection;
+  } tmp;
+
+  struct {
+    const VTermSelectionCallbacks *callbacks;
+    void *user;
+    char *buffer;
+    size_t buflen;
+  } selection;
+
+  // Maintain two stacks, one for primary screen and one for altscreen
+  struct VTermKeyEncodingStack key_encoding_stacks[2];
+};
+
+struct VTerm {
+  const VTermAllocatorFunctions *allocator;
+  void *allocdata;
+
+  int rows;
+  int cols;
+
+  struct {
+    unsigned utf8:1;
+    unsigned ctrl8bit:1;
+  } mode;
+
+  struct {
+    enum VTermParserState {
+      NORMAL,
+      CSI_LEADER,
+      CSI_ARGS,
+      CSI_INTERMED,
+      DCS_COMMAND,
+      // below here are the "string states"
+      OSC_COMMAND,
+      OSC,
+      DCS_VTERM,
+      APC,
+      PM,
+      SOS,
+    } state;
+
+    bool in_esc : 1;
+
+    int intermedlen;
+    char intermed[INTERMED_MAX];
+
+    union {
+      struct {
+        int leaderlen;
+        char leader[CSI_LEADER_MAX];
+
+        int argi;
+        long args[CSI_ARGS_MAX];
+      } csi;
+      struct {
+        int command;
+      } osc;
+      struct {
+        int commandlen;
+        char command[CSI_LEADER_MAX];
+      } dcs;
+    } v;
+
+    const VTermParserCallbacks *callbacks;
+    void *cbdata;
+
+    bool string_initial;
+
+    bool emit_nul;
+  } parser;
+
+  // len == malloc()ed size; cur == number of valid bytes
+
+  VTermOutputCallback *outfunc;
+  void *outdata;
+
+  char *outbuffer;
+  size_t outbuffer_len;
+  size_t outbuffer_cur;
+
+  char *tmpbuffer;
+  size_t tmpbuffer_len;
+
+  VTermState *state;
+  VTermScreen *screen;
+};
+
+struct VTermEncoding {
+  void (*init)(VTermEncoding *enc, void *data);
+  void (*decode)(VTermEncoding *enc, void *data, uint32_t cp[], int *cpi, int cplen,
+                 const char bytes[], size_t *pos, size_t len);
+};
+
+typedef enum {
+  ENC_UTF8,
+  ENC_SINGLE_94,
+} VTermEncodingType;
+
+enum {
+  C1_SS3 = 0x8f,
+  C1_DCS = 0x90,
+  C1_CSI = 0x9b,
+  C1_ST  = 0x9c,
+  C1_OSC = 0x9d,
+};