def evaluate(self, expression):
assert expression.startswith("$") and expression.endswith("$"), \
expression
expression = expression[1:-1]
m = name_match(expression)
if m:
type, expr = m.group(1, 2)
else:
type = "path"
expr = expression
if type in ("string", "str"):
return expr
if type in ("path", "var", "global", "local"):
return self.evaluatePathOrVar(expr)
if type == "not":
return not self.evaluate(expr)
if type == "exists":
return expr in self.locals or expr in self.globals
if type == "python":
try:
return eval(expr, self.globals, self.locals)
except:
raise TALExpressionError("evaluation error in %s" % repr(expr))
if type == "position":
# Insert the current source file name, line number,
# and column offset.
if self.position:
lineno, offset = self.position
else:
lineno, offset = None, None
return '%s (%s,%s)' % (self.source_file, lineno, offset)
raise TALExpressionError("unrecognized expression: " +
repr(expression))
def evaluatePathOrVar(self, expr):
expr = expr.strip()
if expr in self.locals:
return self.locals[expr]
elif expr in self.globals:
return self.globals[expr]
else:
raise TALExpressionError("unknown variable: %s" % repr(expr))
def findMacroFile(self, macroName):
if not macroName:
raise TALExpressionError("empty macro name")
i = macroName.rfind('/')
if i < 0:
# No slash -- must be a locally defined macro
return None, macroName
else:
# Up to last slash is the filename
fileName = macroName[:i]
localName = macroName[i+1:]
return fileName, localName
def evaluateMacro(self, macroName):
assert macroName.startswith("$") and macroName.endswith("$"), \
macroName
macroName = macroName[1:-1]
file, localName = self.findMacroFile(macroName)
if not file:
# Local macro
macro = self.macros[localName]
else:
# External macro
import driver
program, macros = driver.compilefile(file)
macro = macros.get(localName)
if not macro:
raise TALExpressionError("macro %s not found in file %s" %
(localName, file))
return macro