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//===-- lib/Evaluate/fold-character.cpp -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "fold-implementation.h"
#include "fold-reduction.h"
namespace Fortran::evaluate {
static std::optional<ConstantSubscript> GetConstantLength(
FoldingContext &context, Expr<SomeType> &&expr) {
expr = Fold(context, std::move(expr));
if (auto *chExpr{UnwrapExpr<Expr<SomeCharacter>>(expr)}) {
if (auto len{chExpr->LEN()}) {
return ToInt64(*len);
}
}
return std::nullopt;
}
template <typename T>
static std::optional<ConstantSubscript> GetConstantLength(
FoldingContext &context, FunctionRef<T> &funcRef, int zeroBasedArg) {
if (auto *expr{funcRef.UnwrapArgExpr(zeroBasedArg)}) {
return GetConstantLength(context, std::move(*expr));
} else {
return std::nullopt;
}
}
template <typename T>
static std::optional<Scalar<T>> Identity(
Scalar<T> str, std::optional<ConstantSubscript> len) {
if (len) {
return CharacterUtils<T::kind>::REPEAT(
str, std::max<ConstantSubscript>(*len, 0));
} else {
return std::nullopt;
}
}
template <int KIND>
Expr<Type<TypeCategory::Character, KIND>> FoldIntrinsicFunction(
FoldingContext &context,
FunctionRef<Type<TypeCategory::Character, KIND>> &&funcRef) {
using T = Type<TypeCategory::Character, KIND>;
using StringType = Scalar<T>; // std::string or larger
using SingleCharType = typename StringType::value_type; // char &c.
auto *intrinsic{std::get_if<SpecificIntrinsic>(&funcRef.proc().u)};
CHECK(intrinsic);
std::string name{intrinsic->name};
if (name == "achar" || name == "char") {
using IntT = SubscriptInteger;
return FoldElementalIntrinsic<T, IntT>(context, std::move(funcRef),
ScalarFunc<T, IntT>([](const Scalar<IntT> &i) {
return CharacterUtils<KIND>::CHAR(i.ToUInt64());
}));
} else if (name == "adjustl") {
return FoldElementalIntrinsic<T, T>(
context, std::move(funcRef), CharacterUtils<KIND>::ADJUSTL);
} else if (name == "adjustr") {
return FoldElementalIntrinsic<T, T>(
context, std::move(funcRef), CharacterUtils<KIND>::ADJUSTR);
} else if (name == "max") {
return FoldMINorMAX(context, std::move(funcRef), Ordering::Greater);
} else if (name == "maxval") {
SingleCharType least{0};
if (auto identity{Identity<T>(
StringType{least}, GetConstantLength(context, funcRef, 0))}) {
return FoldMaxvalMinval<T>(
context, std::move(funcRef), RelationalOperator::GT, *identity);
}
} else if (name == "merge") {
return FoldMerge<T>(context, std::move(funcRef));
} else if (name == "min") {
return FoldMINorMAX(context, std::move(funcRef), Ordering::Less);
} else if (name == "minval") {
// Collating sequences correspond to positive integers (3.31)
SingleCharType most{0x7fffffff >> (8 * (4 - KIND))};
if (auto identity{Identity<T>(
StringType{most}, GetConstantLength(context, funcRef, 0))}) {
return FoldMaxvalMinval<T>(
context, std::move(funcRef), RelationalOperator::LT, *identity);
}
} else if (name == "new_line") {
return Expr<T>{Constant<T>{CharacterUtils<KIND>::NEW_LINE()}};
} else if (name == "repeat") { // not elemental
if (auto scalars{GetScalarConstantArguments<T, SubscriptInteger>(
context, funcRef.arguments())}) {
return Expr<T>{Constant<T>{
CharacterUtils<KIND>::REPEAT(std::get<Scalar<T>>(*scalars),
std::get<Scalar<SubscriptInteger>>(*scalars).ToInt64())}};
}
} else if (name == "trim") { // not elemental
if (auto scalar{
GetScalarConstantArguments<T>(context, funcRef.arguments())}) {
return Expr<T>{Constant<T>{
CharacterUtils<KIND>::TRIM(std::get<Scalar<T>>(*scalar))}};
}
}
// TODO: cshift, eoshift, maxloc, minloc, pack, spread, transfer,
// transpose, unpack
return Expr<T>{std::move(funcRef)};
}
template <int KIND>
Expr<Type<TypeCategory::Character, KIND>> FoldOperation(
FoldingContext &context, Concat<KIND> &&x) {
if (auto array{ApplyElementwise(context, x)}) {
return *array;
}
using Result = Type<TypeCategory::Character, KIND>;
if (auto folded{OperandsAreConstants(x)}) {
return Expr<Result>{Constant<Result>{folded->first + folded->second}};
}
return Expr<Result>{std::move(x)};
}
template <int KIND>
Expr<Type<TypeCategory::Character, KIND>> FoldOperation(
FoldingContext &context, SetLength<KIND> &&x) {
if (auto array{ApplyElementwise(context, x)}) {
return *array;
}
using Result = Type<TypeCategory::Character, KIND>;
if (auto folded{OperandsAreConstants(x)}) {
auto oldLength{static_cast<ConstantSubscript>(folded->first.size())};
auto newLength{folded->second.ToInt64()};
if (newLength < oldLength) {
folded->first.erase(newLength);
} else {
folded->first.append(newLength - oldLength, ' ');
}
CHECK(static_cast<ConstantSubscript>(folded->first.size()) == newLength);
return Expr<Result>{Constant<Result>{std::move(folded->first)}};
}
return Expr<Result>{std::move(x)};
}
FOR_EACH_CHARACTER_KIND(template class ExpressionBase, )
template class ExpressionBase<SomeCharacter>;
} // namespace Fortran::evaluate
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