From 5661b404b0104c3065a40ad622bdd3c11d748a99 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 20 Apr 2017 17:31:26 +0300
Subject: Implement string_parser

---
 butl/string-parser.cxx | 132 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 butl/string-parser.cxx

(limited to 'butl/string-parser.cxx')

diff --git a/butl/string-parser.cxx b/butl/string-parser.cxx
new file mode 100644
index 0000000..9228d66
--- /dev/null
+++ b/butl/string-parser.cxx
@@ -0,0 +1,132 @@
+// file      : butl/string-parser.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <butl/string-parser>
+
+#include <utility> // move()
+
+using namespace std;
+
+namespace butl
+{
+  // Utility functions
+  //
+  inline static bool
+  space (char c) noexcept
+  {
+    return c == ' ' || c == '\t';
+  }
+
+  // string_parser
+  //
+  vector<pair<string, size_t>> string_parser::
+  parse_quoted_position (const string& s, bool unquote)
+  {
+    vector<pair<string, size_t>> r;
+    for (auto b (s.begin ()), i (b), e (s.end ()); i != e; )
+    {
+      for (; i != e && space (*i); ++i) ; // Skip spaces.
+
+      if (i == e) // No more strings.
+        break;
+
+      string s;
+      char quoting ('\0'); // Current quoting mode, can be used as bool.
+      size_t pos (i - b);  // String position.
+
+      for (; i != e; ++i)
+      {
+        char c (*i);
+
+        if (!quoting)
+        {
+          if (space (c))             // End of string.
+            break;
+
+          if (c == '"' || c == '\'') // Begin of quoted substring.
+          {
+            quoting = c;
+
+            if (!unquote)
+              s += c;
+
+            continue;
+          }
+        }
+        else if (c == quoting)       // End of quoted substring.
+        {
+          quoting = '\0';
+
+          if (!unquote)
+            s += c;
+
+          continue;
+        }
+
+        s += c;
+      }
+
+      if (quoting)
+        throw invalid_string (i - b, "unterminated quoted string");
+
+      r.emplace_back (move (s), pos);
+    }
+
+    return r;
+  }
+
+  vector<string> string_parser::
+  parse_quoted (const string& s, bool unquote)
+  {
+    vector<pair<string, size_t>> sp (parse_quoted_position (s, unquote));
+
+    vector<string> r;
+    r.reserve (sp.size ());
+    for (auto& s: sp)
+      r.emplace_back (move (s.first));
+
+    return r;
+  }
+
+  string string_parser::
+  unquote (const string& s)
+  {
+    string r;
+    char quoting ('\0'); // Current quoting mode, can be used as bool.
+
+    for (auto i (s.begin ()), e (s.end ()); i != e; ++i)
+    {
+      char c (*i);
+
+      if (!quoting)
+      {
+        if (c == '"' || c == '\'') // Begin of quoted substring.
+        {
+          quoting = c;
+          continue;
+        }
+      }
+      else if (c == quoting)       // End of quoted substring.
+      {
+        quoting = '\0';
+        continue;
+      }
+
+      r += c;
+    }
+
+    return r;
+  }
+
+  vector<string> string_parser::
+  unquote (const vector<string>& v)
+  {
+    vector<string> r;
+    r.reserve (v.size ());
+    for (auto& s: v)
+      r.emplace_back (unquote (s));
+
+    return r;
+  }
+}
-- 
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