blob: fa30290dc083a2c6ace5f90096f3795b3313be4a (
plain) (
tree)
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//: Support literal non-integers.
:(scenarios load)
:(scenario noninteger_literal)
recipe main [
1:number <- copy 3.14159
]
+parse: ingredient: 3.14159: "literal-fractional-number"
:(after "Parsing reagent(string s)")
if (is_noninteger(s)) {
name = s;
type = new type_tree("literal-fractional-number", 0);
set_value(to_double(s));
return;
}
:(code)
bool is_noninteger(const string& s) {
return s.find_first_not_of("0123456789-.") == string::npos
&& s.find_first_of ("0123456789-") != string::npos
&& std::count(s.begin(), s.end(), '.') == 1;
}
double to_double(string n) {
char* end = NULL;
// safe because string.c_str() is guaranteed to be null-terminated
double result = strtod(n.c_str(), &end);
assert(*end == '\0');
return result;
}
void test_is_noninteger() {
CHECK(!is_noninteger("1234"));
CHECK(!is_noninteger("1a2"));
CHECK(is_noninteger("234.0"));
CHECK(!is_noninteger("..."));
CHECK(!is_noninteger("."));
CHECK(is_noninteger("2."));
CHECK(is_noninteger(".2"));
}
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