echoing input

[Sean Dunn]

Greg Wilson wrote:

> Hi.  Is there a way to get Python to echo the contents of a script while it
> is
> being loaded?  I have a script called x.py that contains:

# How about this:  (you would call RunVerbose(and your file) which is listed
at the bottom)
# It basically finds statement blocks, inserts print commands around them,
with the correct
# whitespace.
#
# Oh.. and it hasn't even been tested.
#

def Unfinished(accum, first, last):
    cCurly = 0
    cSquare = 0
    cParen = 0
    bBackSlashLast = 0
    lastCharacter = ''

    lineCounter = first
    while lineCounter < last:
        for character in accum[lineCounter]:
            if character == '(':
                cParen = cParen + 1
            elif character == ')':
                cParen = cParen - 1
            elif character == '[':
                cSquare = cSquare + 1
            elif character == ']':
                cSquare = cSquare - 1
            elif character == '{':
                cCurly = cCurly + 1
            elif character == '}':
                cCurly = cCurly - 1

            if character in " \t\n":
                lastCharacter = character
        #for
        lineCounter = lineCounter + 1
    #while

    if (cParen > 0) || (cCurly > 0) || (cSquare > 0) || (lastCharacter ==
'\'):
        # still more to read to make finished
        #
        return 1
    elif (cParen < 0) || (cCurly < 0) || (cSquare < 0):
        # We started negatively imbalanced!
        #
        raise RuntimeError, "Parenthetical Syntax Unbalanced"
    else
        # Cool..
        #
        return 0
    #if
#def

def WhiteSpaceLevel(accum, first, last):
    lineCounter = first
    minLen = 32768 # good starting point?
    minLenString = ''
    while lineCounter < last:
        tempString = ''
        for character in accum[lineCounter]:
            if character in ' \t':
                tempString = tempString + character
            else:
                break
            #if
        #for

        if len(tempString) < menLen:
            minLen = len(tempString)
            minLenString = tempString
        #if
        lineCounter = lineCounter + 1
    #while

    # We now have the smallest amount of whitespace in this chunk..
    # Use it to space inserted commands
    #
    return minLenString
#def

def RunVerbose(file):
    codeAccum = []
    codeIndex = 0

    fp = open(file)
    codeLine = fp.readline()
    unfinishedStart = 0

    while(codeLine):
        codeAccum[codeIndex] = codeLine
        unfinishedStart = codeIndex

        #make sure we insert the 'print' statement in the right place
        #
        while Unfinished(codeAccum, unfinishedStart, codeIndex):
            codeLine = fp.readline()
            codeAccum[codeIndex] = codeLine
            codeIndex = codeIndex + 1
        #while

        #string to add before each line
        #
        whiteSpace = WhiteSpaceLevel(codeAccum, unfinishedStart, codeIndex)
        codeInsertIndex = codeIndex+1  # where do we start
        lineCount = 0 # line counter
        maxLines = codeIndex - unfinishedStart # how many lines are we adding

        # do the insertions
        #
        while(lineCount < maxLines):
            codeAccum[codeInsertIndex + lineCount] = \
                whiteSpace + "print ('" + codeAccum[unfinishedStart
+ lineCount] + "')"
            lineCount = lineCount + 1
        #while

        codeIndex = codeInsertIndex + (codeIndex - unfinishedStart)
        codeLine = fp.readline()
        # at this point, codeIndex has been updated to the next place in the
array..
        #
    #while

    if codeIndex > 0:
        finalCodeString = ''
        finalCounter = 0
        codeIndex = codeIndex - 1 # back off
        while finalCounter < codeIndex):
            finalCodeString = finalCodeString + codeAccum[finalCounter]
            finalCounter = finalCounter + 1
        #while

        # Without further ado.. cross your fingers
        #
        exec(finalCodeString)
    #if
#def