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module base.definition;
import std.string;
import std.variant;
import std.typecons;
import std.container : DList;
import base.stack;
alias Words = Stack!Token[string];
Nullable!(DList!Token) definition;
Words words;
void start() {
definition = DList!Token();
}
void end() {
string wordToBeDefined;
definition.front.visit!(
(int value) => wordToBeDefined = "",
(bool value) => wordToBeDefined = "",
(string name ) => wordToBeDefined = name
);
if ( wordToBeDefined == "" ) {
throw new Exception("words may not be numeric or boolean");
}
definition.removeFront;
words[wordToBeDefined] = Stack!Token(definition[]);
definition.nullify;
}
bool handle(Token token) {
if ( definition.isNull ) {
return false;
} else {
if ( token.type == typeid(string) ) {
if ( *token.peek!string == ";" ) {
end;
} else {
definition.insertBack(token);
}
} else {
definition.insertBack(token);
}
return true;
}
}
Stack!Token get(string word) {
if ( word in words ) {
return words[word].dup;
} else {
return Stack!Token(Token(word));
}
}
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