219 lines
7.1 KiB
C++
219 lines
7.1 KiB
C++
#pragma once
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#include "libsyntax_global.h"
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#include <libtoken.h>
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#include <memory>
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#include <tuple>
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#include <functional>
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namespace ast_basic {
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class Expression;
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class ExpressionElement;
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}
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namespace lib_syntax {
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/**
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* @brief 语法异常
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*/
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class SyntaxException {
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private:
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QString msg_store;
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public:
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SyntaxException(const QString& message);
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virtual ~SyntaxException() = default;
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virtual QString message() const;
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};
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class BaseRule;
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// 基础语法解析接口 ===================================================================================================
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/**
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* @brief 解析上下文接口
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*/
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class ParseContext {
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public:
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virtual ~ParseContext() = default;
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/**
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* \brief 当前表达式元素.
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*
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* \return 返回当前表达式
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*/
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virtual std::shared_ptr<ast_basic::Expression> currentInst() const = 0;
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virtual void pushInst(std::shared_ptr<ast_basic::Expression> current_inst) = 0;
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virtual std::shared_ptr<ast_basic::Expression> popInst() = 0;
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virtual std::shared_ptr<const BaseRule> currentExpressionRule() const = 0;
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virtual void pushExpressionRule(std::shared_ptr<const BaseRule> inst) = 0;
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virtual std::shared_ptr<const BaseRule> popExpressionRule() = 0;
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};
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/**
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* @brief 基础语法匹配规则接口
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*/
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class BaseRule {
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public:
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virtual ~BaseRule() = default;
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/**
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* @brief 子规则
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* @return
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*/
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virtual QList<std::shared_ptr<const BaseRule>> children() const = 0;
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/**
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* @brief 匹配结果
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*/
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enum class MatchResult {
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Success, // 符合匹配条件
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Part, // 部分匹配
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Fail // 从第一个词起完全不匹配
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};
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/**
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* @brief token流匹配
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* @return 首部对齐，匹配token集合
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*/
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virtual std::tuple<MatchResult, uint> match(const QList<std::shared_ptr<const lib_token::Token>>& stream) const = 0;
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/**
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* @brief 解析
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* @param stream
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* @return
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*/
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virtual std::shared_ptr<const ast_basic::Expression> parse(std::shared_ptr<ParseContext> rt_inst, const QList<std::shared_ptr<const lib_token::Token>>& stream) const = 0;
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/**
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* 返回匹配语法规则的词法序列表达
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*
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* \return 词法表达序列
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*/
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virtual QString token_present() const = 0;
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};
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/**
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* @brief token匹配
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*/
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class LIBSYNTAX_EXPORT TokenMatch : public BaseRule, public std::enable_shared_from_this<TokenMatch> {
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private:
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std::shared_ptr<const lib_token::TokenDefine> define_peer;
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public:
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TokenMatch(std::shared_ptr<const lib_token::TokenDefine> define);
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// BaseRule interface
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public:
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virtual QList<std::shared_ptr<const BaseRule>> children() const override;
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virtual std::tuple<MatchResult, uint> match(const QList<std::shared_ptr<const lib_token::Token>>& stream) const override;
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virtual std::shared_ptr<const ast_basic::Expression> parse(std::shared_ptr<ParseContext> rt_inst, const QList<std::shared_ptr<const lib_token::Token>>& stream) const override;
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virtual QString token_present() const override;
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};
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/**
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* @brief 语法规则或匹配
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*/
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class LIBSYNTAX_EXPORT Any : public BaseRule, public std::enable_shared_from_this<Any> {
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private:
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QList<std::shared_ptr<const BaseRule>> mbrs_store;
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std::tuple<MatchResult, uint, std::shared_ptr<const BaseRule>> rule_select(const QList<std::shared_ptr<const lib_token::Token>>& stream) const;
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public:
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Any(const QList<std::shared_ptr<const BaseRule>> mbrs);
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// BaseRule interface
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public:
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virtual QList<std::shared_ptr<const BaseRule>> children() const override;
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virtual std::tuple<MatchResult, uint> match(const QList<std::shared_ptr<const lib_token::Token>>& stream) const override;
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virtual std::shared_ptr<const ast_basic::Expression> parse(std::shared_ptr<ParseContext> rt_inst, const QList<std::shared_ptr<const lib_token::Token>>& stream) const override;
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virtual QString token_present() const override;
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};
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/**
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* @brief 语法规则序列匹配
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*/
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class LIBSYNTAX_EXPORT Seqs : public BaseRule, public std::enable_shared_from_this<Seqs> {
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private:
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QList<std::shared_ptr<const BaseRule>> mbrs_store;
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public:
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Seqs(const QList<std::shared_ptr<const BaseRule>> mbrs);
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// BaseRule interface
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public:
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virtual QList<std::shared_ptr<const BaseRule>> children() const override;
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virtual std::tuple<MatchResult, uint> match(const QList<std::shared_ptr<const lib_token::Token>>& stream) const override;
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virtual std::shared_ptr<const ast_basic::Expression> parse(std::shared_ptr<ParseContext> rt_inst, const QList<std::shared_ptr<const lib_token::Token>>& stream) const override;
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virtual QString token_present() const override;
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};
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/**
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* @brief 语法规则重复匹配
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*/
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class LIBSYNTAX_EXPORT Rept : public BaseRule, public std::enable_shared_from_this<Rept> {
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private:
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std::shared_ptr<const BaseRule> rule_peer;
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int min_match, max_match;
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public:
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Rept(std::shared_ptr<const BaseRule> rule, int min, int max);
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// BaseRule interface
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public:
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virtual QList<std::shared_ptr<const BaseRule>> children() const override;
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virtual std::tuple<MatchResult, uint> match(const QList<std::shared_ptr<const lib_token::Token>>& stream) const override;
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virtual std::shared_ptr<const ast_basic::Expression> parse(std::shared_ptr<ParseContext> rt_inst, const QList<std::shared_ptr<const lib_token::Token>>& stream) const override;
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virtual QString token_present() const override;
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};
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// 组合语法实体解析 ===================================================================================================
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/**
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* @brief 对应语法表达式解析规则
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*/
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class LIBSYNTAX_EXPORT ExpressionRule : public lib_syntax::BaseRule, public std::enable_shared_from_this<ExpressionRule> {
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public:
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typedef QList<std::shared_ptr<const lib_token::Token>> TokenSeqs;
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ExpressionRule(const QString& rule_name, int expr_mark);
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virtual std::shared_ptr<const ExpressionRule> reloadRule(std::function<TokenSeqs(const TokenSeqs&)> filter, std::shared_ptr<const BaseRule> rule);
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virtual QString name() const;
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virtual int typeMark() const;
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virtual std::shared_ptr<ast_basic::Expression> newEmptyInstance() const = 0;
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virtual std::shared_ptr<ExpressionRule> makeCopy() const = 0;
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// BaseRule interface
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public:
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virtual QList<std::shared_ptr<const lib_syntax::BaseRule>> children() const override;
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virtual std::tuple<MatchResult, uint> match(const QList<std::shared_ptr<const lib_token::Token>>& stream) const override;
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virtual std::shared_ptr<const ast_basic::Expression> parse(std::shared_ptr<ParseContext> rt_inst, const QList<std::shared_ptr<const lib_token::Token>>& stream) const override;
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virtual QString token_present() const override;
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private:
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std::function<TokenSeqs(const TokenSeqs&)> filter_proc;
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std::shared_ptr<const lib_syntax::BaseRule> child_store;
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QString name_store;
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int mark_store;
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};
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/**
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* 语法元素解析规则.
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*/
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template<class ExprType>
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class ElementRule : public ExpressionRule {
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public:
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ElementRule(const QString& rule_name, int expr_mark)
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:ExpressionRule(rule_name, expr_mark){}
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virtual std::shared_ptr<ast_basic::Expression> newEmptyInstance() const {
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return std::dynamic_pointer_cast<ast_basic::Expression>(
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std::make_shared<ExprType>(this->shared_from_this()));
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}
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virtual std::shared_ptr<ExpressionRule> makeCopy() const {
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return std::make_shared<ElementRule<ExprType>>(name(), typeMark());
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}
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};
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} // namespace lib_syntax
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