Check if given lines of code are complete and proper Python code

Question

Sorry for my English. This problem is complicated, and my English isn't thats good to describe everything clearly.

Ok, I have this example code. This is only a small code, in real environment i operate on much larger code than that.

01: multi_line_string = """Abc
02: Dfg
03: Hjk"""
04: # Comment
05: do_somethingA()
06: do_somethingB()
07: do_somethingC()
08: string_with_linebrak = "Abc \
09: Dfg \
10: Hjk"

This code, each line as list element i get as argument in my function with one line number. In result i need to return list of 2 lines around given line number. For example, with this code i get line number 5. This is do_somethingA() line.

My function must return list with 5 elements - 2 lines before line 5, line 5 and 2 lines after line 5. That is:

03: Hjk"""
04: # Comment
05: do_somethingA()
06: do_somethingB()
07: do_somethingB()

As you see in return i have broken Python code. Unfortunately, I must get complete code. So, I need somehow detect that line 3 are not complete line of Python code and i need to detect where this broken line are started or ended and get all lines along the way. So, what i need is:

01: multi_line_string = """Abc
02: Dfg
03: Hjk"""
04: # Comment
05: do_somethingA()
06: do_somethingB()
07: do_somethingC()

Lexing complete code is not an option, I need most CPU efficient way to do this.

I'm sorry but I really don't get it. I mean, it's quite obvious that you must return the code from the beginning to get a "complete" code. Or did you mean that you just need to get the beginning of the string? — dierre
– dierre, Commented Jul 22, 2011 at 20:29

murgatroid99 · Accepted Answer · 2011-07-22 20:32:23Z

4

I would suggest looking at pylint.

answered Jul 22, 2011 at 20:32

murgatroid99

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1 Comment

dierre Over a year ago

on a side note: is there something like pylint for java?

S.Lott · Accepted Answer · 2011-07-22 20:51:21Z

0

Get the abstract syntax tree. http://docs.python.org/library/ast.html
Walk the tree inserting "previous statement"/"next statement" links from each node to the previous statement node. And from the previous statement to the current statement.

How this will work with compound statements (for, while, if, try, with, def, class) is beyond me.

Break from this two statements after the required line number.
Go back two statements. Dump the 5 statements that start from the current position in the tree.

answered Jul 22, 2011 at 20:51

S.Lott

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