tree-sitter-dart 0.2.0

Dart grammar for tree-sitter
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142

#include "tree_sitter/parser.h"
#include <wctype.h>

enum TokenType {
  TEMPLATE_CHARS_SINGLE,
  TEMPLATE_CHARS_DOUBLE,
  TEMPLATE_CHARS_SINGLE_SINGLE,
  TEMPLATE_CHARS_DOUBLE_SINGLE,
  TEMPLATE_CHARS_RAW_SLASH,
  BLOCK_COMMENT,
  DOCUMENTATION_BLOCK_COMMENT,
  ANNOTATION_OPEN_PAREN,
};

void *tree_sitter_dart_external_scanner_create() { return NULL; }
void tree_sitter_dart_external_scanner_destroy(void *p) { (void)p; }
void tree_sitter_dart_external_scanner_reset(void *p) { (void)p; }
unsigned tree_sitter_dart_external_scanner_serialize(void *p, char *buffer) { (void)p; (void)buffer; return 0; }
void tree_sitter_dart_external_scanner_deserialize(void *p, const char *b, unsigned n) { (void)p; (void)b; (void)n; }

static void advance(TSLexer *lexer) { lexer->advance(lexer, false); }


static bool scan_multiline_comments(TSLexer *lexer) {

    bool documentation_comment = false;
    advance(lexer);
    if (lexer->lookahead != '*') return false;
    advance(lexer);
    if (lexer->lookahead == '*') documentation_comment = true;

    bool after_star = false;
    unsigned nesting_depth = 1;
    for (;;) {
      switch (lexer->lookahead) {
        case '\0':
          return false;
        case '*':
          advance(lexer);
          after_star = true;
          break;
        case '/':
          if (after_star) {
            advance(lexer);
            after_star = false;
            nesting_depth--;
            if (nesting_depth == 0) {
              if (!documentation_comment) {
                lexer->result_symbol = BLOCK_COMMENT;
              } else {
                lexer->result_symbol = DOCUMENTATION_BLOCK_COMMENT;
              }
              return true;
            }
          } else {
            advance(lexer);
            after_star = false;
            if (lexer->lookahead == '*') {
              nesting_depth++;
              advance(lexer);
            }
          }
          break;
        default:
          advance(lexer);
          after_star = false;
          break;
      }
    }
  return false;
}


static bool scan_templates(TSLexer *lexer, const bool *valid_symbols) {
  if(valid_symbols[TEMPLATE_CHARS_DOUBLE]) {
              lexer->result_symbol = TEMPLATE_CHARS_DOUBLE;
  } else if (valid_symbols[TEMPLATE_CHARS_SINGLE]) {
              lexer->result_symbol = TEMPLATE_CHARS_SINGLE;
  } else if (valid_symbols[TEMPLATE_CHARS_SINGLE_SINGLE]) {
              lexer->result_symbol = TEMPLATE_CHARS_SINGLE_SINGLE;
  } else {
              lexer->result_symbol = TEMPLATE_CHARS_DOUBLE_SINGLE;
  }
  for (bool has_content = false;; has_content = true) {
    lexer->mark_end(lexer);
    switch (lexer->lookahead) {
      case '\'':
      case '"':
        return has_content;
      case '\n':
        if (valid_symbols[TEMPLATE_CHARS_DOUBLE_SINGLE] || valid_symbols[TEMPLATE_CHARS_SINGLE_SINGLE]) return false;
        advance(lexer);
        break;
      case '\0':
        return false;
      case '$':
        return has_content;
      case '\\':
        if (valid_symbols[TEMPLATE_CHARS_RAW_SLASH]) {
            lexer->result_symbol = TEMPLATE_CHARS_RAW_SLASH;
            advance(lexer);
        } else {
            return has_content;
        }
        break;
      default:
        advance(lexer);
    }
  }
  return true;
}



bool tree_sitter_dart_external_scanner_scan(void *payload, TSLexer *lexer,
                                                  const bool *valid_symbols) {
  (void)payload;
  if (
      valid_symbols[TEMPLATE_CHARS_DOUBLE] ||
      valid_symbols[TEMPLATE_CHARS_SINGLE] ||
      valid_symbols[TEMPLATE_CHARS_DOUBLE_SINGLE] ||
      valid_symbols[TEMPLATE_CHARS_SINGLE_SINGLE]
  ) {
    return scan_templates(lexer, valid_symbols);
  }

  // Annotation open paren: only match '(' immediately (no whitespace).
  // This disambiguates @Foo(args) from @override (RecordType).
  if (valid_symbols[ANNOTATION_OPEN_PAREN] && lexer->lookahead == '(') {
    advance(lexer);
    lexer->mark_end(lexer);
    lexer->result_symbol = ANNOTATION_OPEN_PAREN;
    return true;
  }

  while (iswspace(lexer->lookahead)) lexer->advance(lexer, true);

  if (lexer->lookahead == '/') {
    return scan_multiline_comments(lexer);
  }
  return false;
}