content: # Copyright 2004-2005 Elemental Security, Inc. All Rights Reserved.
  # Licensed to PSF under a Contributor Agreement.
  """Convert graminit.[ch] spit out by pgen to Python code.
  
  Pgen is the Python parser generator.  It is useful to quickly create a
  parser from a grammar file in Python's grammar notation.  But I don't
  want my parsers to be written in C (yet), so I'm translating the
  parsing tables to Python data structures and writing a Python parse
  engine.
  
  Note that the token numbers are constants determined by the standard
  Python tokenizer.  The standard token module defines these numbers and
  their names (the names are not used much).  The token numbers are
  hardcoded into the Python tokenizer and into pgen.  A Python
  implementation of the Python tokenizer is also available, in the
  standard tokenize module.
  
  On the other hand, symbol numbers (representing the grammar's
  non-terminals) are assigned by pgen based on the actual grammar
  input.
  
  Note: this module is pretty much obsolete; the pgen module generates
  equivalent grammar tables directly from the Grammar.txt input file
  without having to invoke the Python pgen C program.
  
  """
  
  # Python imports
  import re
  
  # Local imports
  from pgen2 import grammar
  from pgen2 import token
  
  
  class Converter(grammar.Grammar):
    """Grammar subclass that reads classic pgen output files.
  
      The run() method reads the tables as produced by the pgen parser
      generator, typically contained in two C files, graminit.h and
      graminit.c.  The other methods are for internal use only.
  
      See the base class for more documentation.
  
      """
  
    def run(self, graminit_h, graminit_c):
      """Load the grammar tables from the text files written by pgen."""
      self.parse_graminit_h(graminit_h)
      self.parse_graminit_c(graminit_c)
      self.finish_off()
  
    def parse_graminit_h(self, filename):
      """Parse the .h file written by pgen.  (Internal)
  
          This file is a sequence of #define statements defining the
          nonterminals of the grammar as numbers.  We build two tables
          mapping the numbers to names and back.
  
          """
      try:
        f = open(filename)
      except OSError as err:
        print("Can't open %s: %s" % (filename, err))
        return False
      self.symbol2number = {}
      self.number2symbol = {}
      lineno = 0
      for line in f:
        lineno += 1
        mo = re.match(r'^#define\s+(\w+)\s+(\d+)$', line)
        if not mo and line.strip():
          print("%s(%s): can't parse %s" % (filename, lineno, line.strip()))
        else:
          symbol, number = mo.groups()
          number = int(number)
          assert symbol not in self.symbol2number
          assert number not in self.number2symbol
          self.symbol2number[symbol] = number
          self.number2symbol[number] = symbol
      return True
  
    def parse_graminit_c(self, filename):
      """Parse the .c file written by pgen.  (Internal)
  
          The file looks as follows.  The first two lines are always this:
  
          #include "pgenheaders.h"
          #include "grammar.h"
  
          After that come four blocks:
  
          1) one or more state definitions
          2) a table defining dfas
          3) a table defining labels
          4) a struct defining the grammar
  
          A state definition has the following form:
          - one or more arc arrays, each of the form:
            static arc arcs_<n>_<m>[<k>] = {
                    {<i>, <j>},
                    ...
            };
          - followed by a state array, of the form:
            static state states_<s>[<t>] = {
                    {<k>, arcs_<n>_<m>},
                    ...
            };
  
          """
      try:
        f = open(filename)
      except OSError as err:
        print("Can't open %s: %s" % (filename, err))
        return False
      # The code below essentially uses f's iterator-ness!
      lineno = 0
  
      # Expect the two #include lines
      lineno, line = lineno + 1, next(f)
      assert line == '#include "pgenheaders.h"\n', (lineno, line)
      lineno, line = lineno + 1, next(f)
      assert line == '#include "grammar.h"\n', (lineno, line)
  
      # Parse the state definitions
      lineno, line = lineno + 1, next(f)
      allarcs = {}
      states = []
      while line.startswith('static arc '):
        while line.startswith('static arc '):
          mo = re.match(r'static arc arcs_(\d+)_(\d+)\[(\d+)\] = {$', line)
          assert mo, (lineno, line)
          n, m, k = list(map(int, mo.groups()))
          arcs = []
          for _ in range(k):
            lineno, line = lineno + 1, next(f)
            mo = re.match(r'\s+{(\d+), (\d+)},$', line)
            assert mo, (lineno, line)
            i, j = list(map(int, mo.groups()))
            arcs.append((i, j))
          lineno, line = lineno + 1, next(f)
          assert line == '};\n', (lineno, line)
          allarcs[(n, m)] = arcs
          lineno, line = lineno + 1, next(f)
        mo = re.match(r'static state states_(\d+)\[(\d+)\] = {$', line)
        assert mo, (lineno, line)
        s, t = list(map(int, mo.groups()))
        assert s == len(states), (lineno, line)
        state = []
        for _ in range(t):
          lineno, line = lineno + 1, next(f)
          mo = re.match(r'\s+{(\d+), arcs_(\d+)_(\d+)},$', line)
          assert mo, (lineno, line)
          k, n, m = list(map(int, mo.groups()))
          arcs = allarcs[n, m]
          assert k == len(arcs), (lineno, line)
          state.append(arcs)
        states.append(state)
        lineno, line = lineno + 1, next(f)
        assert line == '};\n', (lineno, line)
        lineno, line = lineno + 1, next(f)
      self.states = states
  
      # Parse the dfas
      dfas = {}
      mo = re.match(r'static dfa dfas\[(\d+)\] = {$', line)
      assert mo, (lineno, line)
      ndfas = int(mo.group(1))
      for i in range(ndfas):
        lineno, line = lineno + 1, next(f)
        mo = re.match(r'\s+{(\d+), "(\w+)", (\d+), (\d+), states_(\d+),$', line)
        assert mo, (lineno, line)
        symbol = mo.group(2)
        number, x, y, z = list(map(int, mo.group(1, 3, 4, 5)))
        assert self.symbol2number[symbol] == number, (lineno, line)
        assert self.number2symbol[number] == symbol, (lineno, line)
        assert x == 0, (lineno, line)
        state = states[z]
        assert y == len(state), (lineno, line)
        lineno, line = lineno + 1, next(f)
        mo = re.match(r'\s+("(?:\\\d\d\d)*")},$', line)
        assert mo, (lineno, line)
        first = {}
        rawbitset = eval(mo.group(1))
        for i, c in enumerate(rawbitset):
          byte = ord(c)
          for j in range(8):
            if byte & (1 << j):
              first[i * 8 + j] = 1
        dfas[number] = (state, first)
      lineno, line = lineno + 1, next(f)
      assert line == '};\n', (lineno, line)
      self.dfas = dfas
  
      # Parse the labels
      labels = []
      lineno, line = lineno + 1, next(f)
      mo = re.match(r'static label labels\[(\d+)\] = {$', line)
      assert mo, (lineno, line)
      nlabels = int(mo.group(1))
      for i in range(nlabels):
        lineno, line = lineno + 1, next(f)
        mo = re.match(r'\s+{(\d+), (0|"\w+")},$', line)
        assert mo, (lineno, line)
        x, y = mo.groups()
        x = int(x)
        if y == '0':
          y = None
        else:
          y = eval(y)
        labels.append((x, y))
      lineno, line = lineno + 1, next(f)
      assert line == '};\n', (lineno, line)
      self.labels = labels
  
      # Parse the grammar struct
      lineno, line = lineno + 1, next(f)
      assert line == 'grammar _PyParser_Grammar = {\n', (lineno, line)
      lineno, line = lineno + 1, next(f)
      mo = re.match(r'\s+(\d+),$', line)
      assert mo, (lineno, line)
      ndfas = int(mo.group(1))
      assert ndfas == len(self.dfas)
      lineno, line = lineno + 1, next(f)
      assert line == '\tdfas,\n', (lineno, line)
      lineno, line = lineno + 1, next(f)
      mo = re.match(r'\s+{(\d+), labels},$', line)
      assert mo, (lineno, line)
      nlabels = int(mo.group(1))
      assert nlabels == len(self.labels), (lineno, line)
      lineno, line = lineno + 1, next(f)
      mo = re.match(r'\s+(\d+)$', line)
      assert mo, (lineno, line)
      start = int(mo.group(1))
      assert start in self.number2symbol, (lineno, line)
      self.start = start
      lineno, line = lineno + 1, next(f)
      assert line == '};\n', (lineno, line)
      try:
        lineno, line = lineno + 1, next(f)
      except StopIteration:
        pass
      else:
        assert 0, (lineno, line)
  
    def finish_off(self):
      """Create additional useful structures.  (Internal)."""
      self.keywords = {}  # map from keyword strings to arc labels
      self.tokens = {}  # map from numeric token values to arc labels
      for ilabel, (type, value) in enumerate(self.labels):
        if type == token.NAME and value is not None:
          self.keywords[value] = ilabel
        elif value is None:
          self.tokens[type] = ilabel
  