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Minor refactor to the Plural-Forms parser (#16489)
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y5nw
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parent
053ca6287a
commit
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3 changed files with 158 additions and 174 deletions
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@ -1,136 +1,77 @@
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// Minetest
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// Luanti
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// SPDX-License-Identifier: LGPL-2.1-or-later
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/* This file implements a recursive descent parser for gettext plural forms.
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* Left recursion (for left-associative operators) is implemented by parse_ltr, which iteratively attempts to reduce
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* expressions from operations of the same precedence. This should not be confused with reduce_ltr, which recurses
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* through a list of operators with the same precedence (not the input string!) to search for a match.
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* Note that this only implements a subset of C expressions. See:
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* https://git.savannah.gnu.org/gitweb/?p=gettext.git;a=blob;f=gettext-runtime/intl/plural.y
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*/
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#include "gettext_plural_form.h"
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#include "util/string.h"
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#include <type_traits>
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static size_t minsize(const GettextPluralForm::Ptr &form)
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static GettextPluralForm::NumT identity(GettextPluralForm::NumT n)
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{
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return form ? form->size() : 0;
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return n;
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}
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static size_t minsize(const GettextPluralForm::Ptr &f, const GettextPluralForm::Ptr &g)
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static GettextPluralForm::NumT ternary_op(GettextPluralForm::NumT n, const GettextPluralForm::Function &cond,
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const GettextPluralForm::Function &val, const GettextPluralForm::Function &alt)
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{
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if (sizeof(g) > 0)
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return std::min(minsize(f), minsize(g));
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return f ? f->size() : 0;
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return cond(n) ? val(n) : alt(n);
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}
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class Identity: public GettextPluralForm
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template<template<typename> typename Func, class... Args>
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static GettextPluralForm::Function wrap_op(Args&&... args)
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{
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public:
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Identity(size_t nplurals): GettextPluralForm(nplurals) {};
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NumT operator()(const NumT n) const override
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{
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return n;
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}
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};
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return std::bind(Func<GettextPluralForm::NumT>(), std::bind(std::move(args), std::placeholders::_1)...);
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}
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class ConstValue: public GettextPluralForm
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{
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public:
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ConstValue(size_t nplurals, NumT val): GettextPluralForm(nplurals), value(val) {};
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NumT operator()(const NumT n) const override
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{
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return value;
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}
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private:
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NumT value;
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};
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typedef std::pair<GettextPluralForm::Function, std::wstring_view> ParserResult;
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typedef ParserResult (*Parser)(std::wstring_view);
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template<template<typename> typename F>
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class UnaryOperation: public GettextPluralForm
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{
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public:
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UnaryOperation(const Ptr &op):
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GettextPluralForm(minsize(op)), op(op) {}
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NumT operator()(const NumT n) const override
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{
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if (operator bool())
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return func((*op)(n));
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return 0;
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}
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private:
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Ptr op;
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static constexpr F<NumT> func = {};
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};
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template<template<typename> typename F>
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class BinaryOperation: public GettextPluralForm
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{
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public:
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BinaryOperation(const Ptr &lhs, const Ptr &rhs):
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GettextPluralForm(minsize(lhs, rhs)),
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lhs(lhs), rhs(rhs) {}
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NumT operator()(const NumT n) const override
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{
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if (operator bool())
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return func((*lhs)(n), (*rhs)(n));
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return 0;
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}
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private:
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Ptr lhs, rhs;
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static constexpr F<NumT> func = {};
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};
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class TernaryOperation: public GettextPluralForm
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{
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public:
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TernaryOperation(const Ptr &cond, const Ptr &val, const Ptr &alt):
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GettextPluralForm(std::min(minsize(cond), minsize(val, alt))),
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cond(cond), val(val), alt(alt) {}
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NumT operator()(const NumT n) const override
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{
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if (operator bool())
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return (*cond)(n) ? (*val)(n) : (*alt)(n);
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return 0;
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}
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private:
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Ptr cond, val, alt;
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};
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typedef std::pair<GettextPluralForm::Ptr, std::wstring_view> ParserResult;
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typedef ParserResult (*Parser)(const size_t, std::wstring_view);
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static ParserResult parse_expr(const size_t nplurals, std::wstring_view str);
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static ParserResult parse_expr(std::wstring_view str);
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template<Parser Parser, template<typename> typename Operator>
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static ParserResult reduce_ltr(const size_t nplurals, const ParserResult &res, const wchar_t* pattern)
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static ParserResult reduce_ltr_single(const ParserResult &res, const std::wstring &pattern)
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{
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if (!str_starts_with(res.second, pattern))
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return ParserResult(nullptr, res.second);
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auto next = Parser(nplurals, trim(res.second.substr(std::char_traits<wchar_t>::length(pattern))));
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auto next = Parser(trim(res.second.substr(pattern.size())));
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if (!next.first)
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return next;
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next.first = GettextPluralForm::Ptr(new BinaryOperation<Operator>(res.first, next.first));
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next.first = wrap_op<Operator>(res.first, next.first);
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next.second = trim(next.second);
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return next;
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}
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template<Parser Parser>
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static ParserResult reduce_ltr(const size_t nplurals, const ParserResult &res, const wchar_t**)
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static ParserResult reduce_ltr(const ParserResult &res)
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{
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return ParserResult(nullptr, res.second);
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}
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template<Parser Parser, template<typename> typename Operator, template<typename> typename... Operators>
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static ParserResult reduce_ltr(const size_t nplurals, const ParserResult &res, const wchar_t** patterns)
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static ParserResult reduce_ltr(const ParserResult &res, const std::wstring &pattern, const typename std::conditional<1,std::wstring,Operators<GettextPluralForm::NumT>>::type&... patterns)
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{
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auto next = reduce_ltr<Parser, Operator>(nplurals, res, patterns[0]);
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auto next = reduce_ltr_single<Parser, Operator>(res, pattern);
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if (next.first || next.second != res.second)
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return next;
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return reduce_ltr<Parser, Operators...>(nplurals, res, patterns+1);
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return reduce_ltr<Parser, Operators...>(res, patterns...);
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}
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template<Parser Parser, template<typename> typename Operator, template<typename> typename... Operators>
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static ParserResult parse_ltr(const size_t nplurals, std::wstring_view str, const wchar_t** patterns)
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template<Parser Parser, template<typename> typename... Operators>
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static ParserResult parse_ltr(std::wstring_view str, const typename std::conditional<1,std::wstring,Operators<GettextPluralForm::NumT>>::type&... patterns)
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{
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auto &&pres = Parser(nplurals, str);
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auto &&pres = Parser(str);
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if (!pres.first)
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return pres;
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pres.second = trim(pres.second);
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while (!pres.second.empty()) {
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auto next = reduce_ltr<Parser, Operator, Operators...>(nplurals, pres, patterns);
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auto next = reduce_ltr<Parser, Operators...>(pres, patterns...);
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if (!next.first)
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return pres;
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next.second = trim(next.second);
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@ -139,25 +80,26 @@ static ParserResult parse_ltr(const size_t nplurals, std::wstring_view str, cons
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return pres;
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}
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static ParserResult parse_atomic(const size_t nplurals, std::wstring_view str)
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static ParserResult parse_atomic(std::wstring_view str)
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{
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if (str.empty())
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return ParserResult(nullptr, str);
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if (str[0] == 'n')
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return ParserResult(new Identity(nplurals), trim(str.substr(1)));
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return ParserResult(identity, trim(str.substr(1)));
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wchar_t* endp;
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auto val = wcstoul(str.data(), &endp, 10);
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return ParserResult(new ConstValue(nplurals, val), trim(str.substr(endp-str.data())));
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return ParserResult([val](GettextPluralForm::NumT _) -> GettextPluralForm::NumT { return val; },
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trim(str.substr(endp-str.data())));
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}
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static ParserResult parse_parenthesized(const size_t nplurals, std::wstring_view str)
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static ParserResult parse_parenthesized(std::wstring_view str)
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{
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if (str.empty())
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return ParserResult(nullptr, str);
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if (str[0] != '(')
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return parse_atomic(nplurals, str);
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auto result = parse_expr(nplurals, str.substr(1));
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return parse_atomic(str);
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auto result = parse_expr(str.substr(1));
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if (result.first) {
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if (result.second.empty() || result.second[0] != ')')
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result.first = nullptr;
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@ -167,90 +109,101 @@ static ParserResult parse_parenthesized(const size_t nplurals, std::wstring_view
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return result;
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}
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static ParserResult parse_negation(const size_t nplurals, std::wstring_view str)
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static ParserResult parse_negation(std::wstring_view str)
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{
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if (str.empty())
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return ParserResult(nullptr, str);
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if (str[0] != '!')
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return parse_parenthesized(nplurals, str);
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auto result = parse_negation(nplurals, trim(str.substr(1)));
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return parse_parenthesized(str);
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auto result = parse_negation(trim(str.substr(1)));
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if (result.first)
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result.first = GettextPluralForm::Ptr(new UnaryOperation<std::logical_not>(result.first));
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result.first = wrap_op<std::logical_not>(result.first);
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return result;
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}
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static ParserResult parse_multiplicative(const size_t nplurals, std::wstring_view str)
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template<typename T> struct safe_divides {
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T operator()(T lhs, T rhs) const
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{
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return rhs == 0 ? 0 : (lhs / rhs);
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}
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};
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template<typename T> struct safe_modulus {
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T operator()(T lhs, T rhs) const
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{
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return rhs == 0 ? 0 : (lhs % rhs);
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}
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};
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static ParserResult parse_multiplicative(std::wstring_view str)
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{
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static const wchar_t *patterns[] = { L"*", L"/", L"%" };
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return parse_ltr<parse_negation, std::multiplies, std::divides, std::modulus>(nplurals, str, patterns);
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return parse_ltr<parse_negation, std::multiplies, safe_divides, safe_modulus>(str, L"*", L"/", L"%");
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}
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static ParserResult parse_additive(const size_t nplurals, std::wstring_view str)
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static ParserResult parse_additive(std::wstring_view str)
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{
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static const wchar_t *patterns[] = { L"+", L"-" };
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return parse_ltr<parse_multiplicative, std::plus, std::minus>(nplurals, str, patterns);
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return parse_ltr<parse_multiplicative, std::plus, std::minus>(str, L"+", L"-");
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}
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static ParserResult parse_comparison(const size_t nplurals, std::wstring_view str)
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static ParserResult parse_comparison(std::wstring_view str)
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{
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static const wchar_t *patterns[] = { L"<=", L">=", L"<", L">" };
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return parse_ltr<parse_additive, std::less_equal, std::greater_equal, std::less, std::greater>(nplurals, str, patterns);
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return parse_ltr<parse_additive, std::less_equal, std::greater_equal, std::less, std::greater>(str, L"<=", L">=", L"<", L">");
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}
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static ParserResult parse_equality(const size_t nplurals, std::wstring_view str)
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static ParserResult parse_equality(std::wstring_view str)
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{
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static const wchar_t *patterns[] = { L"==", L"!=" };
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return parse_ltr<parse_comparison, std::equal_to, std::not_equal_to>(nplurals, str, patterns);
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return parse_ltr<parse_comparison, std::equal_to, std::not_equal_to>(str, L"==", L"!=");
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}
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static ParserResult parse_conjunction(const size_t nplurals, std::wstring_view str)
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static ParserResult parse_conjunction(std::wstring_view str)
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{
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static const wchar_t *and_pattern[] = { L"&&" };
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return parse_ltr<parse_equality, std::logical_and>(nplurals, str, and_pattern);
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return parse_ltr<parse_equality, std::logical_and>(str, L"&&");
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}
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static ParserResult parse_disjunction(const size_t nplurals, std::wstring_view str)
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static ParserResult parse_disjunction(std::wstring_view str)
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{
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static const wchar_t *or_pattern[] = { L"||" };
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return parse_ltr<parse_conjunction, std::logical_or>(nplurals, str, or_pattern);
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return parse_ltr<parse_conjunction, std::logical_or>(str, L"||");
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}
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static ParserResult parse_ternary(const size_t nplurals, std::wstring_view str)
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static ParserResult parse_ternary(std::wstring_view str)
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{
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auto pres = parse_disjunction(nplurals, str);
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auto pres = parse_disjunction(str);
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if (pres.second.empty() || pres.second[0] != '?') // no ? :
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return pres;
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auto cond = pres.first;
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pres = parse_ternary(nplurals, trim(pres.second.substr(1)));
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pres = parse_ternary(trim(pres.second.substr(1)));
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if (pres.second.empty() || pres.second[0] != ':')
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return ParserResult(nullptr, pres.second);
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auto val = pres.first;
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pres = parse_ternary(nplurals, trim(pres.second.substr(1)));
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return ParserResult(new TernaryOperation(cond, val, pres.first), pres.second);
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pres = parse_ternary(trim(pres.second.substr(1)));
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return ParserResult(std::bind(ternary_op, std::placeholders::_1,
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std::move(cond), std::move(val), std::move(pres.first)), pres.second);
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}
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static ParserResult parse_expr(const size_t nplurals, std::wstring_view str)
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static ParserResult parse_expr(std::wstring_view str)
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{
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return parse_ternary(nplurals, trim(str));
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return parse_ternary(trim(str));
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}
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GettextPluralForm::Ptr GettextPluralForm::parse(const size_t nplurals, std::wstring_view str)
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static GettextPluralForm::Function parse(std::wstring_view str)
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{
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if (nplurals == 0)
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return nullptr;
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auto result = parse_expr(nplurals, str);
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auto result = parse_expr(str);
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if (!result.second.empty())
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return nullptr;
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return result.first;
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}
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GettextPluralForm::Ptr GettextPluralForm::parseHeaderLine(std::wstring_view str)
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GettextPluralForm::GettextPluralForm(std::wstring_view str)
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{
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if (!str_starts_with(str, L"Plural-Forms: nplurals=") || !str_ends_with(str, L";"))
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return nullptr;
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auto nplurals = wcstoul(str.data()+23, nullptr, 10);
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return;
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auto size = wcstoul(str.data()+23, nullptr, 10);
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auto pos = str.find(L"plural=");
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if (pos == str.npos)
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return nullptr;
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return parse(nplurals, str.substr(pos+7, str.size()-pos-8));
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return;
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auto result = parse(str.substr(pos+7, str.size()-pos-8));
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if (size > 0 && result) {
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nplurals = size;
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func = result;
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}
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}
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@ -1,33 +1,45 @@
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// Minetest
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// Luanti
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// SPDX-License-Identifier: LGPL-2.1-or-later
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#pragma once
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#include <string_view>
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#include <memory>
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#include <functional>
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// Note that this only implements a subset of C expressions. See:
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// https://git.savannah.gnu.org/gitweb/?p=gettext.git;a=blob;f=gettext-runtime/intl/plural.y
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class GettextPluralForm
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{
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public:
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using NumT = unsigned long;
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using Function = std::function<NumT(NumT)>;
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using Ptr = std::shared_ptr<GettextPluralForm>;
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GettextPluralForm(std::wstring_view str);
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size_t size() const
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{
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return nplurals;
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};
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virtual NumT operator()(const NumT) const = 0;
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virtual operator bool() const
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{
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return size() > 0;
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}
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virtual ~GettextPluralForm() {};
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static GettextPluralForm::Ptr parse(const size_t nplurals, std::wstring_view str);
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static GettextPluralForm::Ptr parseHeaderLine(std::wstring_view str);
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protected:
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GettextPluralForm(size_t nplurals): nplurals(nplurals) {};
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// Note that this function does not perform any bounds check as the number of plural
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// translations provided by the translation file may deviate from nplurals,
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NumT operator()(const NumT n) const {
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return func ? func(n) : 0;
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}
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operator bool() const
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{
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return nplurals > 0;
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}
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static Ptr parseHeaderLine(std::wstring_view str) {
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return Ptr(new GettextPluralForm(str));
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}
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private:
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const size_t nplurals;
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// The number of plural forms.
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size_t nplurals = 0;
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// The formula for determining the plural form based on the input value; see
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// https://www.gnu.org/software/gettext/manual/html_node/Translating-plural-forms.html
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// for details.
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Function func = nullptr;
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};
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@ -25,40 +25,59 @@ TEST_CASE("test translations")
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{
|
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SECTION("Plural-Forms function for translations")
|
||||
{
|
||||
#define REQUIRE_FORM_SIZE(x) {REQUIRE(form); REQUIRE(form->size() == (x));}
|
||||
// Test cases from https://www.gnu.org/software/gettext/manual/html_node/Plural-forms.html
|
||||
auto form = GettextPluralForm::parseHeaderLine(L"Plural-Forms: nplurals=2; plural=n != 1;");
|
||||
#define REQUIRE_FORM_SIZE(x) {REQUIRE(form); REQUIRE(form.size() == (x));}
|
||||
// Basic test cases
|
||||
auto form = GettextPluralForm(L"Plural-Forms: nplurals=2; plural=1;");
|
||||
REQUIRE_FORM_SIZE(2);
|
||||
CHECK((*form)(0) == 1);
|
||||
CHECK((*form)(1) == 0);
|
||||
CHECK((*form)(2) == 1);
|
||||
CHECK(form(0) == 1);
|
||||
|
||||
form = GettextPluralForm::parseHeaderLine(L"Plural-Forms: nplurals=3; plural=n%10==1 && n%100!=11 ? 0 : n != 0 ? 1 : 2;");
|
||||
form = GettextPluralForm(L"");
|
||||
REQUIRE(form.size() == 0);
|
||||
CHECK(form(0) == 0);
|
||||
|
||||
// Test cases from https://www.gnu.org/software/gettext/manual/html_node/Plural-forms.html
|
||||
form = GettextPluralForm(L"Plural-Forms: nplurals=2; plural=n != 1;");
|
||||
REQUIRE_FORM_SIZE(2);
|
||||
CHECK(form(0) == 1);
|
||||
CHECK(form(1) == 0);
|
||||
CHECK(form(2) == 1);
|
||||
|
||||
form = GettextPluralForm(L"Plural-Forms: nplurals=3; plural=n%10==1 && n%100!=11 ? 0 : n != 0 ? 1 : 2;");
|
||||
REQUIRE_FORM_SIZE(3);
|
||||
CHECK((*form)(0) == 2);
|
||||
CHECK((*form)(1) == 0);
|
||||
CHECK((*form)(102) == 1);
|
||||
CHECK((*form)(111) == 1);
|
||||
CHECK(form(0) == 2);
|
||||
CHECK(form(1) == 0);
|
||||
CHECK(form(102) == 1);
|
||||
CHECK(form(111) == 1);
|
||||
|
||||
form = GettextPluralForm::parseHeaderLine(L"Plural-Forms: nplurals=3; "
|
||||
form = GettextPluralForm(L"Plural-Forms: nplurals=3; "
|
||||
"plural=n%10==1 && n%100!=11 ? 0 : "
|
||||
"n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2;");
|
||||
REQUIRE_FORM_SIZE(3);
|
||||
CHECK((*form)(0) == 2);
|
||||
CHECK((*form)(1) == 0);
|
||||
CHECK((*form)(102) == 1);
|
||||
CHECK((*form)(104) == 1);
|
||||
CHECK((*form)(111) == 2);
|
||||
CHECK((*form)(112) == 2);
|
||||
CHECK((*form)(121) == 0);
|
||||
CHECK((*form)(122) == 1);
|
||||
CHECK(form(0) == 2);
|
||||
CHECK(form(1) == 0);
|
||||
CHECK(form(102) == 1);
|
||||
CHECK(form(104) == 1);
|
||||
CHECK(form(111) == 2);
|
||||
CHECK(form(112) == 2);
|
||||
CHECK(form(121) == 0);
|
||||
CHECK(form(122) == 1);
|
||||
|
||||
// Edge cases
|
||||
form = GettextPluralForm::parseHeaderLine(L"Plural-Forms: nplurals=3; plural= (n-1+1)<=1 ? n||1?0:1 : 1?(!!2):2;");
|
||||
form = GettextPluralForm(L"Plural-Forms: nplurals=3; plural= (n-1+1)<=1 ? n||1?0:1 : 1?(!!2):2;");
|
||||
REQUIRE_FORM_SIZE(3);
|
||||
CHECK((*form)(0) == 0);
|
||||
CHECK((*form)(1) == 0);
|
||||
CHECK((*form)(2) == 1);
|
||||
CHECK(form(0) == 0);
|
||||
CHECK(form(1) == 0);
|
||||
CHECK(form(2) == 1);
|
||||
|
||||
form = GettextPluralForm(L"Plural-Forms: nplurals=2; plural=4/n;");
|
||||
REQUIRE_FORM_SIZE(2);
|
||||
CHECK(form(1) == 4);
|
||||
CHECK(form(0) == 0);
|
||||
|
||||
form = GettextPluralForm(L"Plural-Forms: nplurals=2; plural=7%n;");
|
||||
REQUIRE_FORM_SIZE(2);
|
||||
CHECK(form(3) == 1);
|
||||
CHECK(form(0) == 0);
|
||||
#undef REQUIRE_FORM_SIZE
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue