separate compilation

1 files changed, 190 insertions, 0 deletions

diff --git a/src/lexer/token.cc b/src/lexer/token.cc
new file mode 100644
index 0000000..2b88b7e
--- /dev/null
+++ b/src/lexer/token.cc
@@ -0,0 +1,190 @@
+#include "lexer/token.h"
+
+#include <string>
+#include <iostream>
+#include <print>
+
+#include "lexer/lexer_class.h"
+#include "lexer/enum_type.h"
+#include "lexer/symbol_property.h"
+
+using namespace std; // remove this
+
+namespace ov4
+{
+
+string T_lexer::trim(const string &s, const string &trim_target) // trim_target = " \t"
+{
+    size_t b = s.find_first_not_of(trim_target);
+    if (b == string::npos)
+        return "";
+    size_t e = s.find_last_not_of(trim_target);
+    return s.substr(b, e - b + 1);
+}
+
+
+bool T_lexer::is_single_symbol(char c)
+{
+    string s = " ";
+    s[0] = c;
+    if (symbol_property.contains(s))
+        return true;
+    return false;
+}
+
+void T_lexer::bracket_depth_changer(char c, int &bracket_depth)
+{
+    if (c == '(')
+    {
+        bracket_depth++;
+        println("changed depth: {}", bracket_depth);
+        return;
+    }
+    if (c == ')')
+    {
+        bracket_depth--;
+        println("changed depth: {}", bracket_depth);
+        if (bracket_depth < 0)
+        {
+            cerr << "Ooooops bracket unmatched, quitting" << endl;
+            exit(-1); // TODO: std::expected or what, rather than quitting
+        }
+        return;
+    }
+}
+
+
+bool T_lexer::token_continue(const string &s, char next)
+{
+    println("token_continue: receiving {} {}", s, next);
+    // s is empty, so next can be part of the token
+    if (s.size() == 0) return true;
+
+    // text -> text/symbol
+    if (!is_single_symbol(s[s.size()-1]))
+    {
+        // text -> symbol
+        if (is_single_symbol(next))
+            return false;
+
+        // text still
+        return true;
+    }
+
+    // symbol -> symbol
+    T_property tmp;
+    if (symbol_property.contains(s))
+    {
+        tmp = symbol_property[s];
+        if (tmp.continuable)
+        {
+            string prev_and_next = s + next;
+            if (symbol_property.contains(prev_and_next))
+                return true;
+            return false;
+        }
+        return false;
+    }
+    else
+    {
+        println("symbol not found in map");
+        return false;
+    }
+}
+
+// handle [prev, current)
+void T_lexer::token_push(const string &push_s, int bracket_depth, bool force_text) // force_text = false
+{
+    T_token tmp;
+    tmp.bracket_depth = bracket_depth;
+    string trimmed = trim(push_s);
+    if (trimmed == "")   return;
+
+    println("finding {} in map", trimmed);
+
+    if (symbol_property.contains(trimmed) && !force_text) // symbol
+    {
+        println("token_push: adding symbol");
+        tmp.token_type = symbol_property[trimmed].enum_type;
+    } 
+    else
+    {
+        println("token_push: adding text");
+        if (force_text)
+            trimmed = trim(trimmed, "\'\"");
+        tmp.token_type = TEXT;
+        tmp.text = trimmed;
+    }
+    token.push_back(tmp);
+}
+
+int T_lexer::tokenizer(const string &s)
+{
+    if (s.size() == 0) return -1;
+
+    size_t len = s.size();
+    size_t token_vector_index = 0;
+    string prev_str = "";
+    bool force_text = false;
+    int bracket_depth = 0;
+    guard_type guard = GUARD_OFF;
+
+
+    for (size_t i = 0; i < len; i++)
+    {
+
+        char c = s[i];
+
+        prev_str += c;
+        
+        println("---");
+        println("prev_str .{}. next char {}", prev_str, s[i+1]);
+
+        if (c == '\'' || c == '\"')
+        {
+            println("quotation");
+
+            // turn on GUARD
+            if (guard == GUARD_OFF)
+            {
+                guard = (c == '\'') ? GUARD_STRONG : GUARD_WEAK;
+                println("set guard {}", (c == '\'') ? "GUARD_STRONG" : "GUARD_WEAK");
+                continue;
+            }
+            // turn off
+            else if (guard == GUARD_STRONG && c == '\'')
+            {
+                guard = GUARD_OFF;
+                println("quitting strong guard");
+                force_text = true;
+            }
+            //turn off
+            else if (guard == GUARD_WEAK && c == '\"')
+            {
+                guard = GUARD_OFF;
+                println("quitting weak guard");
+                force_text = true;
+            } else
+                continue;
+        }
+        // not quotation mark
+        else if ((guard == GUARD_STRONG || guard == GUARD_WEAK))
+        {
+            println("tokenizer: guarded, continue");
+            continue;
+        }
+
+        bracket_depth_changer(c, bracket_depth);
+
+        if ((i+1 == len) || !token_continue(prev_str, s[i+1]))
+        {
+            token_push(prev_str, bracket_depth, force_text);
+            force_text = false;
+            prev_str = "";
+            continue;
+        }
+    }
+    return 0;
+}
+
+}