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lib64/python2.7/compiler/syntax.py 0000644 00000002644 15204230706 0012753 0 ustar 00 """Check for errs in the AST. The Python parser does not catch all syntax errors. Others, like assignments with invalid targets, are caught in the code generation phase. The compiler package catches some errors in the transformer module. But it seems clearer to write checkers that use the AST to detect errors. """ from compiler import ast, walk def check(tree, multi=None): v = SyntaxErrorChecker(multi) walk(tree, v) return v.errors class SyntaxErrorChecker: """A visitor to find syntax errors in the AST.""" def __init__(self, multi=None): """Create new visitor object. If optional argument multi is not None, then print messages for each error rather than raising a SyntaxError for the first. """ self.multi = multi self.errors = 0 def error(self, node, msg): self.errors = self.errors + 1 if self.multi is not None: print "%s:%s: %s" % (node.filename, node.lineno, msg) else: raise SyntaxError, "%s (%s:%s)" % (msg, node.filename, node.lineno) def visitAssign(self, node): # the transformer module handles many of these pass ## for target in node.nodes: ## if isinstance(target, ast.AssList): ## if target.lineno is None: ## target.lineno = node.lineno ## self.error(target, "can't assign to list comprehension")
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