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[flang][Evaluate] Add ExtractSubstring to evaluate/tools.h #81265

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[flang][Evaluate] Add ExtractSubstring to evaluate/tools.h #81265

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22 changes: 22 additions & 0 deletions flang/include/flang/Evaluate/tools.h
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Original file line number Diff line number Diff line change
Expand Up @@ -430,6 +430,28 @@ template <typename A> std::optional<CoarrayRef> ExtractCoarrayRef(const A &x) {
}
}

struct ExtractSubstringHelper {
template <typename T> static std::optional<Substring> visit(T &&) {
return std::nullopt;
}

static std::optional<Substring> visit(const Substring &e) { return e; }

template <typename T>
static std::optional<Substring> visit(const Designator<T> &e) {
return std::visit([](auto &&s) { return visit(s); }, e.u);
}

template <typename T>
static std::optional<Substring> visit(const Expr<T> &e) {
return std::visit([](auto &&s) { return visit(s); }, e.u);
}
};

template <typename A> std::optional<Substring> ExtractSubstring(const A &x) {
return ExtractSubstringHelper::visit(x);
}

// If an expression is simply a whole symbol data designator,
// extract and return that symbol, else null.
template <typename A> const Symbol *UnwrapWholeSymbolDataRef(const A &x) {
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