* parser prototype snapshot

1 files changed, 102 insertions, 0 deletions

diff --git a/parse.h b/parse.h
new file mode 100644
index 00000000..21178a3f
--- /dev/null
+++ b/parse.h
@@ -0,0 +1,102 @@
+// -*- C++ -*-
+// Copyright 2005 Red Hat Inc.
+// GPL
+
+#include <string>
+#include <fstream>
+#include <iostream>
+#include <vector>
+#include <stdexcept>
+
+
+struct source_loc
+{
+  std::string file;
+  unsigned line;
+  unsigned column;
+};
+
+
+enum token_type 
+  {
+    tok_junk, tok_identifier, tok_operator, tok_string, tok_number 
+  };
+
+struct token
+{
+  source_loc location;
+  token_type type;
+  std::string content;
+};
+
+
+struct parse_error: public std::runtime_error
+{
+  parse_error (const std::string& msg): runtime_error (msg) {}
+};
+
+
+class lexer
+{
+public:
+  token* scan ();
+  lexer (std::istream&, const std::string&);
+
+private:
+  int input_get ();
+  std::istream& input;
+  std::string input_name;
+  unsigned cursor_line;
+  unsigned cursor_column;
+};
+
+
+class parser
+{
+public:
+  parser (std::istream& i);
+  parser (const std::string& n);
+  ~parser ();
+
+  stapfile* parse ();
+
+private:
+  std::string input_name;
+  std::istream* free_input;
+  lexer input;
+
+  // scanning state
+  const token* last ();
+  const token* next ();
+  const token* peek ();
+
+  const token* last_t; // the last value returned by peek() or next()
+  const token* next_t; // lookahead token
+
+  void print_error (const parse_error& pe);
+  unsigned num_errors;
+
+private: // nonterminals
+  probe* parse_probe ();
+  probe_point_spec* parse_probe_point_spec ();
+  literal* parse_literal ();
+  symbol* parse_global ();
+  block* parse_stmt_block ();
+  statement* parse_statement ();
+  if_statement* parse_if_statement ();
+  expression* parse_expression ();
+  expression* parse_assignment ();
+  expression* parse_ternary ();
+  expression* parse_logical_or ();
+  expression* parse_logical_and ();
+  expression* parse_array_in ();
+  expression* parse_comparison ();
+  expression* parse_concatenation ();
+  expression* parse_additive ();
+  expression* parse_multiplicative ();
+  expression* parse_unary ();
+  expression* parse_exponentiation ();
+  expression* parse_crement ();
+  expression* parse_value ();
+  expression* parse_symbol ();
+};