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namespace Eva {
public class Atom : Object, Term {
public string value {get; construct;}
public Atom(string v) {
assert(v.validate());
Object(value: v);
}
public string to_string() {
if(value.length == 0)
return "''";
bool special = false;
unichar c = value.get_char();
if(!c.islower())
special = true;
for(unowned string rest = value.next_char(); rest.length != 0 && !special; rest = rest.next_char()) {
c = rest.get_char();
if(!(c == '_' || c.isalnum()))
special = true;
}
if(!special) {
return value;
}
else {
return "'" + value.replace("\\", "\\\\").replace("'", "\\'") + "'";
}
}
protected bool do_match(Term o, Gee.Map<string, Term> vars, Gee.Map<string, string> aliases) {
if(o is Var) {
return o.do_match(this, vars, aliases);
}
if(o is Atom) {
return value == (o as Atom).value;
}
else {
return false;
}
}
internal void encode(Buffer buffer) {
char[]? array = string_to_binary(value);
assert(array != null);
buffer.buffer.encode_atom(array);
}
}
}
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