buildman: Split out Boards into its own file

Use a separate file for the Boards class so that its name matches the
module name.

Fix up the function names to match the pylint style and fix some other
warnings.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/buildman/board.py b/tools/buildman/board.py
index ebb9d6f..3268b39 100644
--- a/tools/buildman/board.py
+++ b/tools/buildman/board.py
@@ -1,74 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0+
 # Copyright (c) 2012 The Chromium OS Authors.
 
-from collections import OrderedDict
-import re
 
-class Expr:
-    """A single regular expression for matching boards to build"""
-
-    def __init__(self, expr):
-        """Set up a new Expr object.
-
-        Args:
-            expr: String cotaining regular expression to store
-        """
-        self._expr = expr
-        self._re = re.compile(expr)
-
-    def matches(self, props):
-        """Check if any of the properties match the regular expression.
-
-        Args:
-           props: List of properties to check
-        Returns:
-           True if any of the properties match the regular expression
-        """
-        for prop in props:
-            if self._re.match(prop):
-                return True
-        return False
-
-    def __str__(self):
-        return self._expr
-
-class Term:
-    """A list of expressions each of which must match with properties.
-
-    This provides a list of 'AND' expressions, meaning that each must
-    match the board properties for that board to be built.
-    """
-    def __init__(self):
-        self._expr_list = []
-        self._board_count = 0
-
-    def add_expr(self, expr):
-        """Add an Expr object to the list to check.
-
-        Args:
-            expr: New Expr object to add to the list of those that must
-                  match for a board to be built.
-        """
-        self._expr_list.append(Expr(expr))
-
-    def __str__(self):
-        """Return some sort of useful string describing the term"""
-        return '&'.join([str(expr) for expr in self._expr_list])
-
-    def matches(self, props):
-        """Check if any of the properties match this term
-
-        Each of the expressions in the term is checked. All must match.
-
-        Args:
-           props: List of properties to check
-        Returns:
-           True if all of the expressions in the Term match, else False
-        """
-        for expr in self._expr_list:
-            if not expr.matches(props):
-                return False
-        return True
+"""A single board which can be selected and built"""
 
 class Board:
     """A particular board that we can build"""
@@ -95,216 +29,3 @@
         self.props = [self.target, self.arch, self.cpu, self.board_name,
                       self.vendor, self.soc, self.options]
         self.build_it = False
-
-
-class Boards:
-    """Manage a list of boards."""
-    def __init__(self):
-        # Use a simple list here, sinc OrderedDict requires Python 2.7
-        self._boards = []
-
-    def add_board(self, brd):
-        """Add a new board to the list.
-
-        The board's target member must not already exist in the board list.
-
-        Args:
-            brd: board to add
-        """
-        self._boards.append(brd)
-
-    def read_boards(self, fname):
-        """Read a list of boards from a board file.
-
-        Create a Board object for each and add it to our _boards list.
-
-        Args:
-            fname: Filename of boards.cfg file
-        """
-        with open(fname, 'r', encoding='utf-8') as fd:
-            for line in fd:
-                if line[0] == '#':
-                    continue
-                fields = line.split()
-                if not fields:
-                    continue
-                for upto in range(len(fields)):
-                    if fields[upto] == '-':
-                        fields[upto] = ''
-                while len(fields) < 8:
-                    fields.append('')
-                if len(fields) > 8:
-                    fields = fields[:8]
-
-                brd = Board(*fields)
-                self.add_board(brd)
-
-
-    def get_list(self):
-        """Return a list of available boards.
-
-        Returns:
-            List of Board objects
-        """
-        return self._boards
-
-    def get_dict(self):
-        """Build a dictionary containing all the boards.
-
-        Returns:
-            Dictionary:
-                key is board.target
-                value is board
-        """
-        board_dict = OrderedDict()
-        for brd in self._boards:
-            board_dict[brd.target] = brd
-        return board_dict
-
-    def get_selected_dict(self):
-        """Return a dictionary containing the selected boards
-
-        Returns:
-            List of Board objects that are marked selected
-        """
-        board_dict = OrderedDict()
-        for brd in self._boards:
-            if brd.build_it:
-                board_dict[brd.target] = brd
-        return board_dict
-
-    def get_selected(self):
-        """Return a list of selected boards
-
-        Returns:
-            List of Board objects that are marked selected
-        """
-        return [brd for brd in self._boards if brd.build_it]
-
-    def get_selected_names(self):
-        """Return a list of selected boards
-
-        Returns:
-            List of board names that are marked selected
-        """
-        return [brd.target for brd in self._boards if brd.build_it]
-
-    def _build_terms(self, args):
-        """Convert command line arguments to a list of terms.
-
-        This deals with parsing of the arguments. It handles the '&'
-        operator, which joins several expressions into a single Term.
-
-        For example:
-            ['arm & freescale sandbox', 'tegra']
-
-        will produce 3 Terms containing expressions as follows:
-            arm, freescale
-            sandbox
-            tegra
-
-        The first Term has two expressions, both of which must match for
-        a board to be selected.
-
-        Args:
-            args: List of command line arguments
-        Returns:
-            A list of Term objects
-        """
-        syms = []
-        for arg in args:
-            for word in arg.split():
-                sym_build = []
-                for term in word.split('&'):
-                    if term:
-                        sym_build.append(term)
-                    sym_build.append('&')
-                syms += sym_build[:-1]
-        terms = []
-        term = None
-        oper = None
-        for sym in syms:
-            if sym == '&':
-                oper = sym
-            elif oper:
-                term.add_expr(sym)
-                oper = None
-            else:
-                if term:
-                    terms.append(term)
-                term = Term()
-                term.add_expr(sym)
-        if term:
-            terms.append(term)
-        return terms
-
-    def select_boards(self, args, exclude=[], brds=None):
-        """Mark boards selected based on args
-
-        Normally either boards (an explicit list of boards) or args (a list of
-        terms to match against) is used. It is possible to specify both, in
-        which case they are additive.
-
-        If brds and args are both empty, all boards are selected.
-
-        Args:
-            args: List of strings specifying boards to include, either named,
-                  or by their target, architecture, cpu, vendor or soc. If
-                  empty, all boards are selected.
-            exclude: List of boards to exclude, regardless of 'args'
-            brds: List of boards to build
-
-        Returns:
-            Tuple
-                Dictionary which holds the list of boards which were selected
-                    due to each argument, arranged by argument.
-                List of errors found
-        """
-        result = OrderedDict()
-        warnings = []
-        terms = self._build_terms(args)
-
-        result['all'] = []
-        for term in terms:
-            result[str(term)] = []
-
-        exclude_list = []
-        for expr in exclude:
-            exclude_list.append(Expr(expr))
-
-        found = []
-        for brd in self._boards:
-            matching_term = None
-            build_it = False
-            if terms:
-                match = False
-                for term in terms:
-                    if term.matches(brd.props):
-                        matching_term = str(term)
-                        build_it = True
-                        break
-            elif brds:
-                if brd.target in brds:
-                    build_it = True
-                    found.append(brd.target)
-            else:
-                build_it = True
-
-            # Check that it is not specifically excluded
-            for expr in exclude_list:
-                if expr.matches(brd.props):
-                    build_it = False
-                    break
-
-            if build_it:
-                brd.build_it = True
-                if matching_term:
-                    result[matching_term].append(brd.target)
-                result['all'].append(brd.target)
-
-        if brds:
-            remaining = set(brds) - set(found)
-            if remaining:
-                warnings.append('Boards not found: %s\n' % ', '.join(remaining))
-
-        return result, warnings