makefile.py

linux下的一款播放器

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"""This file implements a Makefile "sanitizer".  The input is a Makefile
which may or may not be valid.  It is parsed into the Makefile class,
which generates a valid Makefile.  This is here because there are many
Umakefil/*.pcf files which used project.write/project.writeln to write
lines directly to the Makefile.  These lines are not necessarily valid,
and may contain targets with the same name as Umake generates (like
the "all" target).  This takes its best guess at merging, and re-naming
those targets so they continue to work."""

import string
import re


class Macro:
    """Stores a name/value pair for a Makefile macro(variable)."""
    def __init__(self):
        self.name = ""
        self.value = ""


class Target:
    """Stores a target name, list of dependancies, and a list of commands
    for a Makefile target."""
    def __init__(self):
        self.name = ""
        self.depend_list = []
        self.command_list = []
        

class Makefile:
    """Stores a list of Makefile macros and targets.  When referenced as
    a string, the output is a valid Makefile from its macro and target
    lists."""
    
    def __init__(self):
        self.target_list = []
        self.macro_list = []

    def __str__(self):
        line_list = []

        ## write macros
        for macro in self.macro_list:
            line_list.append("%s=%s" % (macro.name, macro.value))
            line_list.append("")

        ## write targets
        for target in self.target_list:
            line_list.append("%s: %s" % (
                target.name, string.join(target.depend_list)))
            for command in target.command_list:
                line_list.append("\t%s" % (command))
            line_list.append("")

        return string.join(line_list, "\n") + "\n"


    def get_variables(self):
        vars={}
        for m in self.macro_list:
            vars[m.name]=m.value
        return vars


def ParseMakefile(buff):
    """Given a buffer containing a Makefile, parse it into a Makefile()
    class."""
    
    mfile = Makefile()

    _re_macro = re.compile("\s*(\w+)\s*=\s*(.*)$")

    ## Nmake cruft
    _re_target0 = re.compile("\s*([A-Za-z]:[^:]*)\s*:\s*(.*)$")

    _re_target1 = re.compile("\s*([^:]+)\s*::\s*(.*)$")
    _re_target2 = re.compile("\s*([^:]+)\s*:\s*(.*)$")

    _state_in_body = "in body"
    _state_in_target = "in target"

    state = _state_in_body
    continue_line = ""
    current_target = None

    line_list = string.split(buff, "\n")
    for line in line_list:
        line = continue_line + string.rstrip(line)

        ## ignore blank lines and comments
        if len(line) == 0 or line[0] == "#":
            continue

        ## handle backslash line continuations
        if line[-1] == "\\":
            continue_line = continue_line + line[:-1]
            continue
        else:
            continue_line = ""

        ## process
        if state == _state_in_target:
            if line[0] == "\t":
                line = string.lstrip(line)
                current_target.command_list.append(line)
            else:
                state = _state_in_body
            
        if state == _state_in_body:
            m = _re_macro.match(line)
            if m:
                macro = Macro()
                mfile.macro_list.append(macro)
                (macro.name, macro.value) = m.groups()
            else:
                m = _re_target0.match(line) or _re_target1.match(line) or _re_target2.match(line)
                if m:
                    state = _state_in_target
                    current_target = Target()
                    mfile.target_list.append(current_target)
                    (current_target.name, deps) = m.groups()
                    current_target.depend_list = string.split(deps)
                else:
                    print "INTERNAL ERROR makefile.py(%s):%s" % (state, line)

    return mfile

def expand_variables(text, variables, empty=0):
    """Expand variables in makefile-style, use makefile.get_vars() for 'variables'"""
    # print "Expanding %s ..." % text
    arr = string.split(text,"$")
    if len(arr) < 2:
        return text

    expanded = {}
    i=1
    while i < len(arr):
        item = arr[i]
        if item[0] == '$':
            pass
        elif item[0] == '(':
            pos = string.index(item,')')
            vname = item[1:pos]

            if expanded.has_key(vname):
                xpand=expanded[vname]
            elif variables.has_key(vname):
                xpand=variables[vname]
                tmp = variables.copy()
                del tmp[vname]
                xpand=expand_variables(xpand,tmp, empty)
            elif empty:
                xpand=""
            else:
                xpand="$("+vname+")"

            expanded[vname]=xpand
            arr[i]=xpand+item[pos+1:]
        else:
            arr[i]="$"+item

        i = i + 1

    # print "Expanding %s to %s " % (text, string.join(arr, ''))
    return string.join(arr, '')

    
## testing
if __name__ == "__main__":
    import sys
    
    try:
        path = sys.argv[1]
    except IndexError:
        print "makefile.py <filename>"
        sys.exit(1)

    buff = open(path, "r").read()
    mfile = ParseMakefile(buff)
    print mfile