Add tree-sitter toy parser for arithmetic expressions

5 files changed, 703 insertions, 0 deletions

diff --git a/demo/tree-sitter-calc/grammar.js b/demo/tree-sitter-calc/grammar.js
new file mode 100644
index 0000000..16d3d8e
--- /dev/null
+++ b/demo/tree-sitter-calc/grammar.js
@@ -0,0 +1,30 @@
+module.exports = grammar({

+    name: 'Calc',

+    rules: {

+        source_file: $ => $.expression,

+

+        expression: $ => choice(

+            $.term,

+            $.unary_expression,

+            $.binary_expression,

+        ),

+

+        unary_expression: $ => prec.left(1, seq('-', $.term)),

+

+        binary_expression: $ => choice(

+            prec.left(2, seq($.expression, '+', $.expression)),

+            prec.left(2, seq($.expression, '-', $.expression)),

+            prec.left(3, seq($.expression, '*', $.expression)),

+            prec.left(3, seq($.expression, '/', $.expression)),

+        ),

+

+        term: $ => choice(

+            $.identifier,

+            $.number,

+            seq('(', $.expression, ')'),

+        ),

+

+        identifier: $ => /[a-z_]+/,

+        number: $ => /[0-9][0-9.]*/,

+    }

+});

diff --git a/demo/tree-sitter-calc/package.json b/demo/tree-sitter-calc/package.json
new file mode 100644
index 0000000..f7442c3
--- /dev/null
+++ b/demo/tree-sitter-calc/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "tree-sitter-calc",
+  "version": "0.9.9",
+  "description": "Tree-sitter parser for arithmetic expressions",
+  "main": "grammar.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Dimitar Trendafilov",
+  "license": "MIT",
+  "dependencies": {
+    "nan": "^2.17.0"
+  },
+  "devDependencies": {
+    "tree-sitter-cli": "^0.20.7"
+  }
+}
diff --git a/demo/tree-sitter-calc/src/parser.c b/demo/tree-sitter-calc/src/parser.c
new file mode 100644
index 0000000..5483d0d
--- /dev/null
+++ b/demo/tree-sitter-calc/src/parser.c
@@ -0,0 +1,431 @@
+#include <tree_sitter/parser.h>
+
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
+#endif
+
+#define LANGUAGE_VERSION 14
+#define STATE_COUNT 15
+#define LARGE_STATE_COUNT 5
+#define SYMBOL_COUNT 14
+#define ALIAS_COUNT 0
+#define TOKEN_COUNT 9
+#define EXTERNAL_TOKEN_COUNT 0
+#define FIELD_COUNT 0
+#define MAX_ALIAS_SEQUENCE_LENGTH 3
+#define PRODUCTION_ID_COUNT 1
+
+enum {
+  anon_sym_DASH = 1,
+  anon_sym_PLUS = 2,
+  anon_sym_STAR = 3,
+  anon_sym_SLASH = 4,
+  anon_sym_LPAREN = 5,
+  anon_sym_RPAREN = 6,
+  sym_identifier = 7,
+  sym_number = 8,
+  sym_source_file = 9,
+  sym_expression = 10,
+  sym_unary_expression = 11,
+  sym_binary_expression = 12,
+  sym_term = 13,
+};
+
+static const char * const ts_symbol_names[] = {
+  [ts_builtin_sym_end] = "end",
+  [anon_sym_DASH] = "-",
+  [anon_sym_PLUS] = "+",
+  [anon_sym_STAR] = "*",
+  [anon_sym_SLASH] = "/",
+  [anon_sym_LPAREN] = "(",
+  [anon_sym_RPAREN] = ")",
+  [sym_identifier] = "identifier",
+  [sym_number] = "number",
+  [sym_source_file] = "source_file",
+  [sym_expression] = "expression",
+  [sym_unary_expression] = "unary_expression",
+  [sym_binary_expression] = "binary_expression",
+  [sym_term] = "term",
+};
+
+static const TSSymbol ts_symbol_map[] = {
+  [ts_builtin_sym_end] = ts_builtin_sym_end,
+  [anon_sym_DASH] = anon_sym_DASH,
+  [anon_sym_PLUS] = anon_sym_PLUS,
+  [anon_sym_STAR] = anon_sym_STAR,
+  [anon_sym_SLASH] = anon_sym_SLASH,
+  [anon_sym_LPAREN] = anon_sym_LPAREN,
+  [anon_sym_RPAREN] = anon_sym_RPAREN,
+  [sym_identifier] = sym_identifier,
+  [sym_number] = sym_number,
+  [sym_source_file] = sym_source_file,
+  [sym_expression] = sym_expression,
+  [sym_unary_expression] = sym_unary_expression,
+  [sym_binary_expression] = sym_binary_expression,
+  [sym_term] = sym_term,
+};
+
+static const TSSymbolMetadata ts_symbol_metadata[] = {
+  [ts_builtin_sym_end] = {
+    .visible = false,
+    .named = true,
+  },
+  [anon_sym_DASH] = {
+    .visible = true,
+    .named = false,
+  },
+  [anon_sym_PLUS] = {
+    .visible = true,
+    .named = false,
+  },
+  [anon_sym_STAR] = {
+    .visible = true,
+    .named = false,
+  },
+  [anon_sym_SLASH] = {
+    .visible = true,
+    .named = false,
+  },
+  [anon_sym_LPAREN] = {
+    .visible = true,
+    .named = false,
+  },
+  [anon_sym_RPAREN] = {
+    .visible = true,
+    .named = false,
+  },
+  [sym_identifier] = {
+    .visible = true,
+    .named = true,
+  },
+  [sym_number] = {
+    .visible = true,
+    .named = true,
+  },
+  [sym_source_file] = {
+    .visible = true,
+    .named = true,
+  },
+  [sym_expression] = {
+    .visible = true,
+    .named = true,
+  },
+  [sym_unary_expression] = {
+    .visible = true,
+    .named = true,
+  },
+  [sym_binary_expression] = {
+    .visible = true,
+    .named = true,
+  },
+  [sym_term] = {
+    .visible = true,
+    .named = true,
+  },
+};
+
+static const TSSymbol ts_alias_sequences[PRODUCTION_ID_COUNT][MAX_ALIAS_SEQUENCE_LENGTH] = {
+  [0] = {0},
+};
+
+static const uint16_t ts_non_terminal_alias_map[] = {
+  0,
+};
+
+static const TSStateId ts_primary_state_ids[STATE_COUNT] = {
+  [0] = 0,
+  [1] = 1,
+  [2] = 2,
+  [3] = 3,
+  [4] = 4,
+  [5] = 5,
+  [6] = 6,
+  [7] = 7,
+  [8] = 8,
+  [9] = 9,
+  [10] = 10,
+  [11] = 11,
+  [12] = 12,
+  [13] = 13,
+  [14] = 14,
+};
+
+static bool ts_lex(TSLexer *lexer, TSStateId state) {
+  START_LEXER();
+  eof = lexer->eof(lexer);
+  switch (state) {
+    case 0:
+      if (eof) ADVANCE(1);
+      if (lookahead == '(') ADVANCE(6);
+      if (lookahead == ')') ADVANCE(7);
+      if (lookahead == '*') ADVANCE(4);
+      if (lookahead == '+') ADVANCE(3);
+      if (lookahead == '-') ADVANCE(2);
+      if (lookahead == '/') ADVANCE(5);
+      if (lookahead == '\t' ||
+          lookahead == '\n' ||
+          lookahead == '\r' ||
+          lookahead == ' ') SKIP(0)
+      if (('0' <= lookahead && lookahead <= '9')) ADVANCE(9);
+      if (lookahead == '_' ||
+          ('a' <= lookahead && lookahead <= 'z')) ADVANCE(8);
+      END_STATE();
+    case 1:
+      ACCEPT_TOKEN(ts_builtin_sym_end);
+      END_STATE();
+    case 2:
+      ACCEPT_TOKEN(anon_sym_DASH);
+      END_STATE();
+    case 3:
+      ACCEPT_TOKEN(anon_sym_PLUS);
+      END_STATE();
+    case 4:
+      ACCEPT_TOKEN(anon_sym_STAR);
+      END_STATE();
+    case 5:
+      ACCEPT_TOKEN(anon_sym_SLASH);
+      END_STATE();
+    case 6:
+      ACCEPT_TOKEN(anon_sym_LPAREN);
+      END_STATE();
+    case 7:
+      ACCEPT_TOKEN(anon_sym_RPAREN);
+      END_STATE();
+    case 8:
+      ACCEPT_TOKEN(sym_identifier);
+      if (lookahead == '_' ||
+          ('a' <= lookahead && lookahead <= 'z')) ADVANCE(8);
+      END_STATE();
+    case 9:
+      ACCEPT_TOKEN(sym_number);
+      if (lookahead == '.' ||
+          ('0' <= lookahead && lookahead <= '9')) ADVANCE(9);
+      END_STATE();
+    default:
+      return false;
+  }
+}
+
+static const TSLexMode ts_lex_modes[STATE_COUNT] = {
+  [0] = {.lex_state = 0},
+  [1] = {.lex_state = 0},
+  [2] = {.lex_state = 0},
+  [3] = {.lex_state = 0},
+  [4] = {.lex_state = 0},
+  [5] = {.lex_state = 0},
+  [6] = {.lex_state = 0},
+  [7] = {.lex_state = 0},
+  [8] = {.lex_state = 0},
+  [9] = {.lex_state = 0},
+  [10] = {.lex_state = 0},
+  [11] = {.lex_state = 0},
+  [12] = {.lex_state = 0},
+  [13] = {.lex_state = 0},
+  [14] = {.lex_state = 0},
+};
+
+static const uint16_t ts_parse_table[LARGE_STATE_COUNT][SYMBOL_COUNT] = {
+  [0] = {
+    [ts_builtin_sym_end] = ACTIONS(1),
+    [anon_sym_DASH] = ACTIONS(1),
+    [anon_sym_PLUS] = ACTIONS(1),
+    [anon_sym_STAR] = ACTIONS(1),
+    [anon_sym_SLASH] = ACTIONS(1),
+    [anon_sym_LPAREN] = ACTIONS(1),
+    [anon_sym_RPAREN] = ACTIONS(1),
+    [sym_identifier] = ACTIONS(1),
+    [sym_number] = ACTIONS(1),
+  },
+  [1] = {
+    [sym_source_file] = STATE(14),
+    [sym_expression] = STATE(11),
+    [sym_unary_expression] = STATE(6),
+    [sym_binary_expression] = STATE(6),
+    [sym_term] = STATE(6),
+    [anon_sym_DASH] = ACTIONS(3),
+    [anon_sym_LPAREN] = ACTIONS(5),
+    [sym_identifier] = ACTIONS(7),
+    [sym_number] = ACTIONS(7),
+  },
+  [2] = {
+    [sym_expression] = STATE(12),
+    [sym_unary_expression] = STATE(6),
+    [sym_binary_expression] = STATE(6),
+    [sym_term] = STATE(6),
+    [anon_sym_DASH] = ACTIONS(3),
+    [anon_sym_LPAREN] = ACTIONS(5),
+    [sym_identifier] = ACTIONS(7),
+    [sym_number] = ACTIONS(7),
+  },
+  [3] = {
+    [sym_expression] = STATE(9),
+    [sym_unary_expression] = STATE(6),
+    [sym_binary_expression] = STATE(6),
+    [sym_term] = STATE(6),
+    [anon_sym_DASH] = ACTIONS(3),
+    [anon_sym_LPAREN] = ACTIONS(5),
+    [sym_identifier] = ACTIONS(7),
+    [sym_number] = ACTIONS(7),
+  },
+  [4] = {
+    [sym_expression] = STATE(10),
+    [sym_unary_expression] = STATE(6),
+    [sym_binary_expression] = STATE(6),
+    [sym_term] = STATE(6),
+    [anon_sym_DASH] = ACTIONS(3),
+    [anon_sym_LPAREN] = ACTIONS(5),
+    [sym_identifier] = ACTIONS(7),
+    [sym_number] = ACTIONS(7),
+  },
+};
+
+static const uint16_t ts_small_parse_table[] = {
+  [0] = 1,
+    ACTIONS(9), 6,
+      ts_builtin_sym_end,
+      anon_sym_DASH,
+      anon_sym_PLUS,
+      anon_sym_STAR,
+      anon_sym_SLASH,
+      anon_sym_RPAREN,
+  [9] = 1,
+    ACTIONS(11), 6,
+      ts_builtin_sym_end,
+      anon_sym_DASH,
+      anon_sym_PLUS,
+      anon_sym_STAR,
+      anon_sym_SLASH,
+      anon_sym_RPAREN,
+  [18] = 1,
+    ACTIONS(13), 6,
+      ts_builtin_sym_end,
+      anon_sym_DASH,
+      anon_sym_PLUS,
+      anon_sym_STAR,
+      anon_sym_SLASH,
+      anon_sym_RPAREN,
+  [27] = 1,
+    ACTIONS(15), 6,
+      ts_builtin_sym_end,
+      anon_sym_DASH,
+      anon_sym_PLUS,
+      anon_sym_STAR,
+      anon_sym_SLASH,
+      anon_sym_RPAREN,
+  [36] = 2,
+    ACTIONS(19), 2,
+      anon_sym_STAR,
+      anon_sym_SLASH,
+    ACTIONS(17), 4,
+      ts_builtin_sym_end,
+      anon_sym_DASH,
+      anon_sym_PLUS,
+      anon_sym_RPAREN,
+  [47] = 1,
+    ACTIONS(17), 6,
+      ts_builtin_sym_end,
+      anon_sym_DASH,
+      anon_sym_PLUS,
+      anon_sym_STAR,
+      anon_sym_SLASH,
+      anon_sym_RPAREN,
+  [56] = 3,
+    ACTIONS(21), 1,
+      ts_builtin_sym_end,
+    ACTIONS(19), 2,
+      anon_sym_STAR,
+      anon_sym_SLASH,
+    ACTIONS(23), 2,
+      anon_sym_DASH,
+      anon_sym_PLUS,
+  [68] = 3,
+    ACTIONS(25), 1,
+      anon_sym_RPAREN,
+    ACTIONS(19), 2,
+      anon_sym_STAR,
+      anon_sym_SLASH,
+    ACTIONS(23), 2,
+      anon_sym_DASH,
+      anon_sym_PLUS,
+  [80] = 3,
+    ACTIONS(5), 1,
+      anon_sym_LPAREN,
+    STATE(7), 1,
+      sym_term,
+    ACTIONS(7), 2,
+      sym_identifier,
+      sym_number,
+  [91] = 1,
+    ACTIONS(27), 1,
+      ts_builtin_sym_end,
+};
+
+static const uint32_t ts_small_parse_table_map[] = {
+  [SMALL_STATE(5)] = 0,
+  [SMALL_STATE(6)] = 9,
+  [SMALL_STATE(7)] = 18,
+  [SMALL_STATE(8)] = 27,
+  [SMALL_STATE(9)] = 36,
+  [SMALL_STATE(10)] = 47,
+  [SMALL_STATE(11)] = 56,
+  [SMALL_STATE(12)] = 68,
+  [SMALL_STATE(13)] = 80,
+  [SMALL_STATE(14)] = 91,
+};
+
+static const TSParseActionEntry ts_parse_actions[] = {
+  [0] = {.entry = {.count = 0, .reusable = false}},
+  [1] = {.entry = {.count = 1, .reusable = false}}, RECOVER(),
+  [3] = {.entry = {.count = 1, .reusable = true}}, SHIFT(13),
+  [5] = {.entry = {.count = 1, .reusable = true}}, SHIFT(2),
+  [7] = {.entry = {.count = 1, .reusable = true}}, SHIFT(5),
+  [9] = {.entry = {.count = 1, .reusable = true}}, REDUCE(sym_term, 1),
+  [11] = {.entry = {.count = 1, .reusable = true}}, REDUCE(sym_expression, 1),
+  [13] = {.entry = {.count = 1, .reusable = true}}, REDUCE(sym_unary_expression, 2),
+  [15] = {.entry = {.count = 1, .reusable = true}}, REDUCE(sym_term, 3),
+  [17] = {.entry = {.count = 1, .reusable = true}}, REDUCE(sym_binary_expression, 3),
+  [19] = {.entry = {.count = 1, .reusable = true}}, SHIFT(4),
+  [21] = {.entry = {.count = 1, .reusable = true}}, REDUCE(sym_source_file, 1),
+  [23] = {.entry = {.count = 1, .reusable = true}}, SHIFT(3),
+  [25] = {.entry = {.count = 1, .reusable = true}}, SHIFT(8),
+  [27] = {.entry = {.count = 1, .reusable = true}},  ACCEPT_INPUT(),
+};
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+#ifdef _WIN32
+#define extern __declspec(dllexport)
+#endif
+
+extern const TSLanguage *tree_sitter_Calc(void) {
+  static const TSLanguage language = {
+    .version = LANGUAGE_VERSION,
+    .symbol_count = SYMBOL_COUNT,
+    .alias_count = ALIAS_COUNT,
+    .token_count = TOKEN_COUNT,
+    .external_token_count = EXTERNAL_TOKEN_COUNT,
+    .state_count = STATE_COUNT,
+    .large_state_count = LARGE_STATE_COUNT,
+    .production_id_count = PRODUCTION_ID_COUNT,
+    .field_count = FIELD_COUNT,
+    .max_alias_sequence_length = MAX_ALIAS_SEQUENCE_LENGTH,
+    .parse_table = &ts_parse_table[0][0],
+    .small_parse_table = ts_small_parse_table,
+    .small_parse_table_map = ts_small_parse_table_map,
+    .parse_actions = ts_parse_actions,
+    .symbol_names = ts_symbol_names,
+    .symbol_metadata = ts_symbol_metadata,
+    .public_symbol_map = ts_symbol_map,
+    .alias_map = ts_non_terminal_alias_map,
+    .alias_sequences = &ts_alias_sequences[0][0],
+    .lex_modes = ts_lex_modes,
+    .lex_fn = ts_lex,
+    .primary_state_ids = ts_primary_state_ids,
+  };
+  return &language;
+}
+#ifdef __cplusplus
+}
+#endif
diff --git a/demo/tree-sitter-calc/src/tree_sitter/parser.h b/demo/tree-sitter-calc/src/tree_sitter/parser.h
new file mode 100644
index 0000000..2b14ac1
--- /dev/null
+++ b/demo/tree-sitter-calc/src/tree_sitter/parser.h
@@ -0,0 +1,224 @@
+#ifndef TREE_SITTER_PARSER_H_
+#define TREE_SITTER_PARSER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#define ts_builtin_sym_error ((TSSymbol)-1)
+#define ts_builtin_sym_end 0
+#define TREE_SITTER_SERIALIZATION_BUFFER_SIZE 1024
+
+typedef uint16_t TSStateId;
+
+#ifndef TREE_SITTER_API_H_
+typedef uint16_t TSSymbol;
+typedef uint16_t TSFieldId;
+typedef struct TSLanguage TSLanguage;
+#endif
+
+typedef struct {
+  TSFieldId field_id;
+  uint8_t child_index;
+  bool inherited;
+} TSFieldMapEntry;
+
+typedef struct {
+  uint16_t index;
+  uint16_t length;
+} TSFieldMapSlice;
+
+typedef struct {
+  bool visible;
+  bool named;
+  bool supertype;
+} TSSymbolMetadata;
+
+typedef struct TSLexer TSLexer;
+
+struct TSLexer {
+  int32_t lookahead;
+  TSSymbol result_symbol;
+  void (*advance)(TSLexer *, bool);
+  void (*mark_end)(TSLexer *);
+  uint32_t (*get_column)(TSLexer *);
+  bool (*is_at_included_range_start)(const TSLexer *);
+  bool (*eof)(const TSLexer *);
+};
+
+typedef enum {
+  TSParseActionTypeShift,
+  TSParseActionTypeReduce,
+  TSParseActionTypeAccept,
+  TSParseActionTypeRecover,
+} TSParseActionType;
+
+typedef union {
+  struct {
+    uint8_t type;
+    TSStateId state;
+    bool extra;
+    bool repetition;
+  } shift;
+  struct {
+    uint8_t type;
+    uint8_t child_count;
+    TSSymbol symbol;
+    int16_t dynamic_precedence;
+    uint16_t production_id;
+  } reduce;
+  uint8_t type;
+} TSParseAction;
+
+typedef struct {
+  uint16_t lex_state;
+  uint16_t external_lex_state;
+} TSLexMode;
+
+typedef union {
+  TSParseAction action;
+  struct {
+    uint8_t count;
+    bool reusable;
+  } entry;
+} TSParseActionEntry;
+
+struct TSLanguage {
+  uint32_t version;
+  uint32_t symbol_count;
+  uint32_t alias_count;
+  uint32_t token_count;
+  uint32_t external_token_count;
+  uint32_t state_count;
+  uint32_t large_state_count;
+  uint32_t production_id_count;
+  uint32_t field_count;
+  uint16_t max_alias_sequence_length;
+  const uint16_t *parse_table;
+  const uint16_t *small_parse_table;
+  const uint32_t *small_parse_table_map;
+  const TSParseActionEntry *parse_actions;
+  const char * const *symbol_names;
+  const char * const *field_names;
+  const TSFieldMapSlice *field_map_slices;
+  const TSFieldMapEntry *field_map_entries;
+  const TSSymbolMetadata *symbol_metadata;
+  const TSSymbol *public_symbol_map;
+  const uint16_t *alias_map;
+  const TSSymbol *alias_sequences;
+  const TSLexMode *lex_modes;
+  bool (*lex_fn)(TSLexer *, TSStateId);
+  bool (*keyword_lex_fn)(TSLexer *, TSStateId);
+  TSSymbol keyword_capture_token;
+  struct {
+    const bool *states;
+    const TSSymbol *symbol_map;
+    void *(*create)(void);
+    void (*destroy)(void *);
+    bool (*scan)(void *, TSLexer *, const bool *symbol_whitelist);
+    unsigned (*serialize)(void *, char *);
+    void (*deserialize)(void *, const char *, unsigned);
+  } external_scanner;
+  const TSStateId *primary_state_ids;
+};
+
+/*
+ *  Lexer Macros
+ */
+
+#define START_LEXER()           \
+  bool result = false;          \
+  bool skip = false;            \
+  bool eof = false;             \
+  int32_t lookahead;            \
+  goto start;                   \
+  next_state:                   \
+  lexer->advance(lexer, skip);  \
+  start:                        \
+  skip = false;                 \
+  lookahead = lexer->lookahead;
+
+#define ADVANCE(state_value) \
+  {                          \
+    state = state_value;     \
+    goto next_state;         \
+  }
+
+#define SKIP(state_value) \
+  {                       \
+    skip = true;          \
+    state = state_value;  \
+    goto next_state;      \
+  }
+
+#define ACCEPT_TOKEN(symbol_value)     \
+  result = true;                       \
+  lexer->result_symbol = symbol_value; \
+  lexer->mark_end(lexer);
+
+#define END_STATE() return result;
+
+/*
+ *  Parse Table Macros
+ */
+
+#define SMALL_STATE(id) id - LARGE_STATE_COUNT
+
+#define STATE(id) id
+
+#define ACTIONS(id) id
+
+#define SHIFT(state_value)            \
+  {{                                  \
+    .shift = {                        \
+      .type = TSParseActionTypeShift, \
+      .state = state_value            \
+    }                                 \
+  }}
+
+#define SHIFT_REPEAT(state_value)     \
+  {{                                  \
+    .shift = {                        \
+      .type = TSParseActionTypeShift, \
+      .state = state_value,           \
+      .repetition = true              \
+    }                                 \
+  }}
+
+#define SHIFT_EXTRA()                 \
+  {{                                  \
+    .shift = {                        \
+      .type = TSParseActionTypeShift, \
+      .extra = true                   \
+    }                                 \
+  }}
+
+#define REDUCE(symbol_val, child_count_val, ...) \
+  {{                                             \
+    .reduce = {                                  \
+      .type = TSParseActionTypeReduce,           \
+      .symbol = symbol_val,                      \
+      .child_count = child_count_val,            \
+      __VA_ARGS__                                \
+    },                                           \
+  }}
+
+#define RECOVER()                    \
+  {{                                 \
+    .type = TSParseActionTypeRecover \
+  }}
+
+#define ACCEPT_INPUT()              \
+  {{                                \
+    .type = TSParseActionTypeAccept \
+  }}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // TREE_SITTER_PARSER_H_
diff --git a/demo/tree-sitter-calc/test.calc b/demo/tree-sitter-calc/test.calc
new file mode 100644
index 0000000..0f9776f
--- /dev/null
+++ b/demo/tree-sitter-calc/test.calc
@@ -0,0 +1 @@
+-1 * (answer+b) * 6 * 7 / 42