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Refactor peek() to use a loop instead of tail recursion

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Rangi42
2025-07-20 11:30:07 -04:00
parent 0eed237517
commit cfe1f60e47
1 changed files with 23 additions and 27 deletions
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50
src/asm/lexer.cpp
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@@ -803,35 +803,31 @@ static std::shared_ptr<std::string> readInterpolation(size_t depth);
static int peek() {
int c = lexerState->peekChar();
if (lexerState->macroArgScanDistance > 0) {
return c;
for (; lexerState->macroArgScanDistance == 0; c = lexerState->peekChar()) {
++lexerState->macroArgScanDistance; // Do not consider again
if (c == '\\' && !lexerState->disableMacroArgs) {
// If character is a backslash, check for a macro arg
++lexerState->macroArgScanDistance;
if (!isMacroChar(lexerState->peekCharAhead())) {
break;
}
// If character is a macro arg char, do macro arg expansion
shiftChar();
if (std::shared_ptr<std::string> str = readMacroArg(); str) {
beginExpansion(str, std::nullopt);
}
} else if (c == '{' && !lexerState->disableInterpolation) {
// If character is an open brace, do symbol interpolation
shiftChar();
if (std::shared_ptr<std::string> str = readInterpolation(0); str) {
beginExpansion(str, *str);
}
}
}
++lexerState->macroArgScanDistance; // Do not consider again
if (c == '\\' && !lexerState->disableMacroArgs) {
// If character is a backslash, check for a macro arg
++lexerState->macroArgScanDistance;
if (!isMacroChar(lexerState->peekCharAhead())) {
return c;
}
// If character is a macro arg char, do macro arg expansion
shiftChar();
if (std::shared_ptr<std::string> str = readMacroArg(); str) {
beginExpansion(str, std::nullopt);
}
return peek(); // Tail recursion
} else if (c == '{' && !lexerState->disableInterpolation) {
// If character is an open brace, do symbol interpolation
shiftChar();
if (std::shared_ptr<std::string> str = readInterpolation(0); str) {
beginExpansion(str, *str);
}
return peek(); // Tail recursion
} else {
return c;
}
return c;
}
static void shiftChar() {