1 files changed, 56 insertions, 0 deletions
diff --git a/lexer.h b/lexer.h
new file mode 100644
index 0000000..c571294
--- /dev/null
+++ b/lexer.h
@@ -0,0 +1,56 @@
+#pragma once
+
+#include "minicc.h"
+#include "bnf.h"
+
+struct TreeNode {
+ index_t parent{};
+ std::vector<index_t> childs; // fill char by char
+ std::vector<std::string> child_names; // fill always
+ std::string name;
+};
+
+class Tree {
+private:
+ std::map<index_t, TreeNode> nodes; // index 0 = non existing; index starting at 1
+ index_t node_num{};
+ index_t root{};
+ index_t last{};
+
+public:
+ void clear();
+ std::string GetType();
+ bool Valid(const std::string& Top) const;
+ bool AddFirstNode(char c, const BNF& bnf, const std::map<std::string, std::set<std::string>>& reverseBNF);
+ std::vector<TreeNode> getParentTreeNode(const BNF& bnf, const std::map<std::string, std::set<std::string>>& reverseBNF);
+ index_t GetLast();
+ void AddRootNode(const TreeNode& newRootNode);
+ void RemoveRootNode();
+ std::vector<std::string> GetPath(std::string a, std::string b, const BNF& bnf, const std::map<std::string, std::set<std::string>>& reverseBNF);
+ index_t AddNode(const std::string& name, const std::string& child_name, index_t parent_index, const BNF& bnf, const std::map<std::string, std::set<std::string>>& reverseBNF);
+ void AddPath(const std::vector<std::string>& path, index_t current_index, const BNF& bnf, const std::map<std::string, std::set<std::string>>& reverseBNF);
+ bool Add(char c, const BNF& bnf, const std::map<std::string, std::set<std::string>>& reverseBNF);
+ void Resolve(const BNF& bnf, const std::map<std::string, std::set<std::string>>& reverseBNF);
+};
+
+class Lexer
+{
+
+private:
+ const BNF &bnf;
+ const std::string& Top;
+
+ Location location{1, 0};
+
+ std::map<std::string, std::set<std::string>> ReverseBNF;
+
+ // to be called on token end
+ void FinalizeTree(Tree& tree, std::string& token, std::vector<Token>& result);
+
+public:
+ Lexer(const BNF& bnf, const std::string& Top);
+ std::vector<Token> Lex(const std::string& s);
+
+};
+
+