mirror of
https://github.com/Sneed-Group/Poodletooth-iLand
synced 2024-11-01 01:07:54 +00:00
47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
|
"""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")
|