61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
#ifndef wg_LEXER_HPP
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#define wg_LEXER_HPP
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#include "commons.hpp"
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#include "Node.hpp"
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#include "Loc.hpp"
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namespace wg
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{
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struct ScanInfo {
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size_t cursor;
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NodeType type;
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std::string repr;
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};
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using scanner_t = std::function<std::optional<ScanInfo>()>;
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class Lexer
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{
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public:
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explicit Lexer();
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virtual ~Lexer();
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void scan(std::string const& source);
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std::shared_ptr<Node> next();
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std::vector<std::shared_ptr<Node>> all();
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private:
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std::string m_source;
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size_t m_cursor = 0;
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Loc m_loc;
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std::vector<scanner_t> m_scanners;
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std::vector<char> m_seps;
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void add_text(std::string const& text,
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NodeType node,
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bool has_value=false);
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void add_keyword(std::string const& text,
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NodeType node,
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bool has_value=false);
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bool is_sep(size_t index) const;
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void skip_spaces();
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std::optional<ScanInfo> scan_text(std::string const& text,
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NodeType type,
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bool has_value) const;
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std::optional<ScanInfo> scan_keyword(std::string const& text,
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NodeType type,
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bool has_value) const;
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std::optional<ScanInfo> scan_ident() const;
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std::optional<ScanInfo> scan_int() const;
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};
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}
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#endif
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