blob: fa5c3ba298856b1df576b71b8e57d1f08030da0f (
plain) (
blame)
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
|
//: An alternative syntax for reagents that permits whitespace in properties,
//: grouped by brackets. We'll use this ability in the next layer, when we
//: generalize types from lists to trees of properties.
:(scenarios load)
:(scenario dilated_reagent)
def main [
{1: number, foo: bar} <- copy 34
]
+parse: product: {1: "number", "foo": "bar"}
:(scenario load_trailing_space_after_curly_bracket)
def main [
# line below has a space at the end
{
]
# successfully parsed
:(scenario dilated_reagent_with_comment)
def main [
{1: number, foo: bar} <- copy 34 # test comment
]
+parse: product: {1: "number", "foo": "bar"}
$error: 0
:(scenario dilated_reagent_with_comment_immediately_following)
def main [
1:number <- copy {34: literal} # test comment
]
$error: 0
//: First augment next_word to group balanced brackets together.
:(before "End next_word Special-cases")
if (in.peek() == '(')
return slurp_balanced_bracket(in);
// treat curlies mostly like parens, but don't mess up labels
if (start_of_dilated_reagent(in))
return slurp_balanced_bracket(in);
:(code)
// A curly is considered a label if it's the last thing on a line. Dilated
// reagents should remain all on one line.
bool start_of_dilated_reagent(istream& in) {
if (in.peek() != '{') return false;
int pos = in.tellg();
in.get(); // slurp '{'
skip_whitespace_but_not_newline(in);
char next = in.peek();
in.seekg(pos);
return next != '\n';
}
// Assume the first letter is an open bracket, and read everything until the
// matching close bracket.
// We balance {} () and []. And we skip one character after '\'.
string slurp_balanced_bracket(istream& in) {
ostringstream result;
char c;
list<char> open_brackets;
while (in >> c) {
if (c == '\\') {
// always silently skip the next character
result << c;
if (!(in >> c)) break;
result << c;
continue;
}
if (c == '(') open_brackets.push_back(c);
if (c == ')') {
assert(open_brackets.back() == '(');
open_brackets.pop_back();
}
if (c == '[') open_brackets.push_back(c);
if (c == ']') {
assert(open_brackets.back() == '[');
open_brackets.pop_back();
}
if (c == '{') open_brackets.push_back(c);
if (c == '}') {
assert(open_brackets.back() == '{');
open_brackets.pop_back();
}
result << c;
if (open_brackets.empty()) break;
}
skip_whitespace_and_comments_but_not_newline(in);
return result.str();
}
:(after "Parsing reagent(string s)")
if (s.at(0) == '{') {
assert(properties.empty());
istringstream in(s);
in >> std::noskipws;
in.get(); // skip '{'
name = slurp_key(in);
if (name.empty()) {
raise << "invalid reagent " << s << " without a name\n" << end();
return;
}
if (name == "}") {
raise << "invalid empty reagent " << s << '\n' << end();
return;
}
{
string_tree* value = new string_tree(next_word(in));
// End Parsing Reagent Type Property(value)
type = new_type_tree(value);
delete value;
}
while (has_data(in)) {
string key = slurp_key(in);
if (key.empty()) continue;
if (key == "}") continue;
string_tree* value = new string_tree(next_word(in));
// End Parsing Reagent Property(value)
properties.push_back(pair<string, string_tree*>(key, value));
}
return;
}
:(code)
string slurp_key(istream& in) {
string result = next_word(in);
while (!result.empty() && *result.rbegin() == ':')
strip_last(result);
while (isspace(in.peek()) || in.peek() == ':')
in.get();
return result;
}
|