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Allow negative values to count macro arguments from the end (#1670)

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This commit is contained in:
Rangi
2025-04-20 00:37:50 -04:00
committed by GitHub
parent df83bc31d2
commit 0b7cda9e0c
7 changed files with 91 additions and 11 deletions
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21
src/asm/lexer.cpp
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@@ -625,13 +625,24 @@ static uint32_t readBracketedMacroArgNum() {
lexerState->disableInterpolation = disableInterpolation;
}};
uint32_t num = 0;
int32_t num = 0;
int c = peek();
bool empty = false;
bool symbolError = false;
bool negative = c == '-';
if (negative) {
shiftChar();
c = peek();
}
if (c >= '0' && c <= '9') {
num = readNumber(10, 0);
uint32_t n = readNumber(10, 0);
if (n > INT32_MAX) {
error("Number in bracketed macro argument is too large\n");
return 0;
}
num = negative ? -n : static_cast<int32_t>(n);
} else if (startsIdentifier(c) || c == '#') {
if (c == '#') {
shiftChar();
@@ -664,7 +675,7 @@ static uint32_t readBracketedMacroArgNum() {
num = 0;
symbolError = true;
} else {
num = sym->getConstantValue();
num = static_cast<int32_t>(sym->getConstantValue());
}
} else {
empty = true;
@@ -704,7 +715,7 @@ static std::shared_ptr<std::string> readMacroArg(char name) {
assume(str); // '\#' should always be defined (at least as an empty string)
return str;
} else if (name == '<') {
uint32_t num = readBracketedMacroArgNum();
int32_t num = readBracketedMacroArgNum();
if (num == 0) {
// The error was already reported by `readBracketedMacroArgNum`.
return nullptr;
@@ -718,7 +729,7 @@ static std::shared_ptr<std::string> readMacroArg(char name) {
auto str = macroArgs->getArg(num);
if (!str) {
error("Macro argument '\\<%" PRIu32 ">' not defined\n", num);
error("Macro argument '\\<%" PRId32 ">' not defined\n", num);
}
return str;
} else {