motiejus/zig
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parse if maybe expression

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This commit is contained in:
Andrew Kelley
2015-12-26 15:05:27 -07:00
parent 5943f99510
commit 1f8e3871ee
9 changed files with 176 additions and 72 deletions
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22
src/tokenizer.cpp
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@@ -125,6 +125,7 @@ enum TokenizeState {
TokenizeStateSawGreaterThanGreaterThan,
TokenizeStateSawDot,
TokenizeStateSawDotDot,
TokenizeStateSawQuestionMark,
TokenizeStateError,
};
@@ -402,10 +403,28 @@ void tokenize(Buf *buf, Tokenization *out) {
begin_token(&t, TokenIdDot);
t.state = TokenizeStateSawDot;
break;
case '?':
begin_token(&t, TokenIdMaybe);
t.state = TokenizeStateSawQuestionMark;
break;
default:
tokenize_error(&t, "invalid character: '%c'", c);
}
break;
case TokenizeStateSawQuestionMark:
switch (c) {
case '=':
t.cur_tok->id = TokenIdMaybeAssign;
end_token(&t);
t.state = TokenizeStateStart;
break;
default:
t.pos -= 1;
end_token(&t);
t.state = TokenizeStateStart;
continue;
}
break;
case TokenizeStateSawDot:
switch (c) {
case '.':
@@ -917,6 +936,7 @@ void tokenize(Buf *buf, Tokenization *out) {
case TokenizeStateSawGreaterThan:
case TokenizeStateSawGreaterThanGreaterThan:
case TokenizeStateSawDot:
case TokenizeStateSawQuestionMark:
end_token(&t);
break;
case TokenizeStateSawDotDot:
@@ -1012,6 +1032,8 @@ static const char * token_name(Token *token) {
case TokenIdPercent: return "Percent";
case TokenIdDot: return "Dot";
case TokenIdEllipsis: return "Ellipsis";
case TokenIdMaybe: return "Maybe";
case TokenIdMaybeAssign: return "MaybeAssign";
}
return "(invalid token)";
}