1 files changed, 97 insertions, 0 deletions
diff --git a/src/engine/SCons/EnvironmentValues.py b/src/engine/SCons/EnvironmentValues.py
new file mode 100644
index 0000000..e2efccb
--- /dev/null
+++ b/src/engine/SCons/EnvironmentValues.py
@@ -0,0 +1,97 @@
+import re
+
+_is_valid_var = re.compile(r'[_a-zA-Z]\w*$')
+
+_rm = re.compile(r'\$[()]')
+_remove = re.compile(r'\$\([^\$]*(\$[^\)][^\$]*)*\$\)')
+
+# Regular expressions for splitting strings and handling substitutions,
+# for use by the scons_subst() and scons_subst_list() functions:
+#
+# The first expression compiled matches all of the $-introduced tokens
+# that we need to process in some way, and is used for substitutions.
+# The expressions it matches are:
+#
+#       "$$"
+#       "$("
+#       "$)"
+#       "$variable"             [must begin with alphabetic or underscore]
+#       "${any stuff}"
+#
+# The second expression compiled is used for splitting strings into tokens
+# to be processed, and it matches all of the tokens listed above, plus
+# the following that affect how arguments do or don't get joined together:
+#
+#       "   "                   [white space]
+#       "non-white-space"       [without any dollar signs]
+#       "$"                     [single dollar sign]
+#
+_dollar_exps_str = r'\$[\$\(\)]|\$[_a-zA-Z][\.\w]*|\${[^}]*}'
+_dollar_exps = re.compile(r'(%s)' % _dollar_exps_str)
+_separate_args = re.compile(r'(%s|\s+|[^\s\$]+|\$)' % _dollar_exps_str)
+
+# This regular expression is used to replace strings of multiple white
+# space characters in the string result from the scons_subst() function.
+_space_sep = re.compile(r'[\t ]+(?![^{]*})')
+
+class ValueTypes(object):
+    """
+    Enum to store what type of value the variable holds.
+    """
+    UNKNOWN = 0
+    STRING = 1
+    CALLABLE = 2
+    VARIABLE = 3
+
+
+class EnvironmentValue(object):
+    """
+    Hold a single value. We're going to cache parsed version of the file
+    We're going to keep track of variables which feed into this values evaluation
+    """
+    def __init__(self, value):
+        self.value = value
+        self.var_type = ValueTypes.UNKNOWN
+
+        if callable(self.value):
+            self.var_type = ValueTypes.CALLABLE
+        else:
+            self.parse_value()
+
+
+    def parse_value(self):
+        """
+        Scan the string and break into component values
+        """
+
+        try:
+            if '$' not in self.value:
+                self._parsed = self.value
+                self.var_type = ValueTypes.STRING
+            else:
+                # Now we need to parse the specified string
+                result = _dollar_exps.sub(sub_match, args)
+                print(result)
+            pass
+        except TypeError:
+            # likely callable? either way we don't parse
+            self._parsed = self.value
+
+    def parse_trial(self):
+        """
+        Try alternate parsing methods.
+        :return:
+        """
+        parts = []
+        for c in self.value:
+
+
+
+class EnvironmentValues(object):
+    """
+    A class to hold all the environment variables
+    """
+    def __init__(self, **kw):
+        self._dict = {}
+        for k in kw:
+            self._dict[k] = EnvironmentValue(kw[k])