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Add negative and decimal literal support to tokenizer #17

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merged 2 commits into from
Nov 5, 2024
Merged

Add negative and decimal literal support to tokenizer #17

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0a3771f
Add negative and decimal literal support
ai-kana Nov 5, 2024
e93f86d
Fix J
ai-kana Nov 5, 2024
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149 changes: 107 additions & 42 deletions GDWeave/Script/ScriptTokenizer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,6 @@ public static class ScriptTokenizer {

{"void", TokenType.PrVoid},
{"enum", TokenType.PrEnum},

{"preload", TokenType.PrPreload},
{"assert", TokenType.PrAssert},

Expand Down Expand Up @@ -182,83 +181,149 @@ public static class ScriptTokenizer {

private static readonly List<string> BuiltinFunctions = Enum.GetNames<BuiltinFunction>().ToList();

private static void InsertNewLine(IEnumerator<string> enumerator, uint baseIndent, List<Token> toFlush) {
if (!enumerator.MoveNext()) {
return;
}

var tabCount = uint.Parse(enumerator.Current);
toFlush.Add(new Token(TokenType.Newline, tabCount + baseIndent));
}

private static void BuildIdentifierName(IEnumerator<string> enumerator, List<Token> toFlush, out string? found) {
found = string.Empty;
if (!enumerator.MoveNext()) {
return;
}

if (enumerator.Current == ":") {
toFlush.Add(new Token(TokenType.Wildcard));
toFlush.Add(new Token(TokenType.Semicolon));
return;
}

found = "_" + enumerator.Current;
}

private static void BuildNumber(IEnumerator<string> enumerator, List<Token> toFlush) {
int sign = 1;

if (enumerator.Current == "-") {
sign = -1;
if (!enumerator.MoveNext()) return;
}

if (!long.TryParse(enumerator.Current, out long upper)) {
toFlush.Add(new Token(TokenType.OpSub));
return;
}

if (!enumerator.MoveNext()) return;

if (enumerator.Current != ".") {
toFlush.Add(new ConstantToken(new IntVariant(upper * sign)));
return;
}

if (!enumerator.MoveNext()) return;

if (!long.TryParse(enumerator.Current, out long lower)) {
// I dont think there is really a proper return for here.
// You'd have a number that looks like this "1000."
// No following decimal
// Comment if you had ideas
return;
}

var result = upper + (lower / Math.Pow(10, lower.ToString().Length));
toFlush.Add(new ConstantToken(new RealVariant(result * sign)));
}

public static IEnumerable<Token> Tokenize(string gdScript, uint baseIndent = 0) {
var finalTokens = new List<Token>();
var tokens = SanitizeInput(TokenizeString(gdScript + " "));

var previous = string.Empty;
var idName = string.Empty;

List<Token> toFlush = new(2);
yield return new Token(TokenType.Newline, baseIndent);
foreach (var current in tokens) {
var toFlush = new List<Token>(2);
finalTokens.Add(new Token(TokenType.Newline, baseIndent));
var enumerator = tokens.GetEnumerator();
while (enumerator.MoveNext()) {
var current = enumerator.Current;
if (current == "\n") {
goto endAndFlushId;
}

if (previous == "\n") {
var tabCount = uint.Parse(current);
toFlush.Add(new Token(TokenType.Newline, tabCount + baseIndent));
goto end;
InsertNewLine(enumerator, baseIndent, toFlush);
endAndFlushId();
continue;
}

if (current == "_") {
goto end;
BuildIdentifierName(enumerator, toFlush, out string? found);
if (found == string.Empty) {
endAndFlushId();
continue;
}

idName += found;

end();
continue;
}

if (previous == "_" && current == ":") {
toFlush.Add(new Token(TokenType.Wildcard));
toFlush.Add(new Token(TokenType.Semicolon));
goto endAndFlushId;
} else if (previous == "_") {
idName += "_" + current;
goto end;
if (current == "-" || char.IsDigit(current[0])) {
BuildNumber(enumerator, toFlush);
endAndFlushId();
continue;
}

if (BuiltinFunctions.Contains(current)) {
toFlush.Add(new Token(TokenType.BuiltInFunc, (uint?) BuiltinFunctions.IndexOf(current)));
goto endAndFlushId;
endAndFlushId();
continue;
}

if (Tokens.TryGetValue(current, out var type)) {
toFlush.Add(new Token(type));
goto endAndFlushId;
endAndFlushId();
continue;
}

if (current[0] == '"') {
if (current.StartsWith('"')) {
toFlush.Add(new ConstantToken(new StringVariant(current.Substring(1, current.Length - 2))));
goto endAndFlushId;
endAndFlushId();
continue;
}

if (bool.TryParse(current, out var resultB)) {
toFlush.Add(new ConstantToken(new BoolVariant(resultB)));
goto endAndFlushId;
endAndFlushId();
continue;
}

if (long.TryParse(current, out var resultL)) {
toFlush.Add(new ConstantToken(new IntVariant(resultL)));
goto endAndFlushId;
}
idName += current;

if (double.TryParse(current, out var result)) {
toFlush.Add(new ConstantToken(new RealVariant(result)));
goto endAndFlushId;
end();

void end() {
previous = enumerator.Current;
finalTokens.AddRange(toFlush);
toFlush.Clear();
}

idName += current;
void endAndFlushId() {
if (idName != string.Empty) {
finalTokens.Add(new IdentifierToken(idName));
idName = string.Empty;
}

goto end;
endAndFlushId:
if (idName != string.Empty) {
yield return new IdentifierToken(idName);
idName = string.Empty;
end();
}
end:
previous = current;
foreach (var token in toFlush) yield return token;
toFlush.Clear();
}

yield return new(TokenType.Newline, baseIndent);
finalTokens.Add(new(TokenType.Newline, baseIndent));

foreach (var t in finalTokens) yield return t;

}

private static IEnumerable<string> SanitizeInput(IEnumerable<string> tokens) {
Expand Down
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