source: trunk/essentials/dev-lang/python/Lib/linecache.py@ 3393

"""Cache lines from files.

This is intended to read lines from modules imported -- hence if a filename
is not found, it will look down the module search path for a file by
that name.
"""

import sys
import os

__all__ = ["getline", "clearcache", "checkcache"]

def getline(filename, lineno, module_globals=None):
    lines = getlines(filename, module_globals)
    if 1 <= lineno <= len(lines):
        return lines[lineno-1]
    else:
        return ''


# The cache

cache = {} # The cache


def clearcache():
    """Clear the cache entirely."""

    global cache
    cache = {}


def getlines(filename, module_globals=None):
    """Get the lines for a file from the cache.
    Update the cache if it doesn't contain an entry for this file already."""

    if filename in cache: