"""Parse sys/errno.h and Errors.h and create Estr resource"""

import re
import string
from Carbon import Res
import os

READ = 1
WRITE = 2
smAllScripts = -3

ERRNO_PROG="#define[ \t]+" \
                   "([A-Z0-9a-z_]+)" \
                   "[ \t]+" \
                   "([0-9]+)" \
                   "[ \t]*/\*[ \t]*" \
                   "(.*)" \
                   "[ \t]*\*/"

ERRORS_PROG="[ \t]*" \
                        "([A-Z0-9a-z_]+)" \
                        "[ \t]*=[ \t]*" \
                        "([-0-9]+)" \
                        "[, \t]*/\*[ \t]*" \
                        "(.*)" \
                        "[ \t]*\*/"

ERRORS_PROG_2="[ \t]*" \
                        "([A-Z0-9a-z_]+)" \
                        "[ \t]*=[ \t]*" \
                        "([-0-9]+)" \
                        "[, \t]*"

def Pstring(str):
    if len(str) > 255:
        raise ValueError('String too large')
    return chr(len(str))+str

def writeestr(dst, edict):
    """Create Estr resource file given a dictionary of errors."""

    os.unlink(dst.as_pathname())
    Res.FSpCreateResFile(dst, 'RSED', 'rsrc', smAllScripts)
    output = Res.FSpOpenResFile(dst, WRITE)
    Res.UseResFile(output)
    for num in edict.keys():
        res = Res.Resource(Pstring(edict[num][0]))
        res.AddResource('Estr', num, '')
        res.WriteResource()
    Res.CloseResFile(output)

def writepython(fp, dict):
    k = dict.keys()
    k.sort()
    for i in k:
        fp.write("%s\t=\t%d\t#%s\n"%(dict[i][1], i, dict[i][0]))


def parse_errno_h(fp, dict):
    errno_prog = re.compile(ERRNO_PROG)
    for line in fp.readlines():
        m = errno_prog.match(line)
        if m:
            number = string.atoi(m.group(2))
            name = m.group(1)
            desc = string.strip(m.group(3))

            if not dict.has_key(number):
                dict[number] = desc, name
            else:
                print('DUPLICATE', number)
                print('\t', dict[number])
                print('\t', (desc, name))

def parse_errors_h(fp, dict):
    errno_prog = re.compile(ERRORS_PROG)
    errno_prog_2 = re.compile(ERRORS_PROG_2)
    for line in fp.readlines():
        match = 0
        m = errno_prog.match(line)
        m2 = errno_prog_2.match(line)
        if m:
            number = string.atoi(m.group(2))
            name = m.group(1)
            desc = string.strip(m.group(3))
            match=1
        elif m2:
            number = string.atoi(m2.group(2))
            name = m2.group(1)
            desc = name
            match=1
        if match:
            if number > 0: continue

            if not dict.has_key(number):
                dict[number] = desc, name
            else:
                print('DUPLICATE', number)
                print('\t', dict[number])
                print('\t', (desc, name))
                if len(desc) > len(dict[number][0]):
                    print('Pick second one')
                    dict[number] = desc, name

def main():
    dict = {}
    pathname = EasyDialogs.AskFileForOpen(message="Where is GUSI sys/errno.h?")
    if pathname:
        fp = open(pathname)
        parse_errno_h(fp, dict)
        fp.close()

    pathname = EasyDialogs.AskFileForOpen(message="Select cerrno (MSL) or cancel")
    if pathname:
        fp = open(pathname)
        parse_errno_h(fp, dict)
        fp.close()

    pathname = EasyDialogs.AskFileForOpen(message="Where is MacErrors.h?")
    if pathname:
        fp = open(pathname)
        parse_errors_h(fp, dict)
        fp.close()

    pathname = EasyDialogs.AskFileForOpen(message="Where is mkestrres-MacErrors.h?")
    if pathname:
        fp = open(pathname)
        parse_errors_h(fp, dict)
        fp.close()

    if not dict:
        return

    pathname = EasyDialogs.AskFileForSave(message="Resource output file?", savedFileName="errors.rsrc")
    if pathname:
        writeestr(fss, dict)

    pathname = EasyDialogs.AskFileForSave(message="Python output file?", savedFileName="macerrors.py")
    if pathname:
        fp = open(pathname, "w")
        writepython(fp, dict)
        fp.close()
        fss.SetCreatorType('Pyth', 'TEXT')

    pathname = EasyDialogs.AskFileForSave(message="Text output file?", savedFileName="errors.txt")
    if pathname:
        fp = open(pathname, "w")

        k = dict.keys()
        k.sort()
        for i in k:
            fp.write("%d\t%s\t%s\n"%(i, dict[i][1], dict[i][0]))
        fp.close()


if __name__ == '__main__':
    main()