progress on query compiler

source/orm/query/internal/string_builder_utils.cpp

@@ -0,0 +1,40 @@
+#include "matador/query/internal/string_builder_utils.hpp"
+
+#include "matador/sql/dialect.hpp"
+
+namespace matador::query {
+void prepare_identifier_string_append(std::string& out, const std::string_view col, const sql::dialect &d) {
+  bool first_part = true;
+
+  const char sq = d.start_quote()[0];
+  const char eq = d.end_quote()[0];
+
+  std::size_t i = 0;
+  while (true) {
+    const std::size_t start = i;
+
+    // find end of part
+    while (i < col.size() && col[i] != '.') {
+      ++i;
+    }
+    const std::size_t end = i; // [start, end) is the part
+
+    if (!first_part) {
+      out.push_back('.');
+    }
+    first_part = false;
+
+    // quote_identifier(part) + escape_quotes_in_identifier(part), but streaming:
+    out.push_back(sq);
+    for (std::size_t j = start; j < end; ++j) {
+      const char c = col[j];
+      if (c == eq) out.push_back(eq); // escape " as ""
+      out.push_back(c);
+    }
+    out.push_back(eq);
+
+    if (i >= col.size()) break; // done
+    ++i; // skip '.'
+  }
+}
+}