#! @PYTHON@

import getopt
import os
import re
import sys

sys.path.insert(0, "@abs_top_srcdir@/ovsdb")
import simplejson as json

argv0 = sys.argv[0]

class Error(Exception):
    def __init__(self, msg):
        Exception.__init__(self)
        self.msg = msg

def getMember(json, name, validTypes, description, default=None):
    if name in json:
        member = json[name]
        if type(member) not in validTypes:
            raise Error("%s: type mismatch for '%s' member"
                        % (description, name))
        return member
    return default

def mustGetMember(json, name, expectedType, description):
    member = getMember(json, name, expectedType, description)
    if member == None:
        raise Error("%s: missing '%s' member" % (description, name))
    return member

class DbSchema:
    def __init__(self, name, comment, tables, idlPrefix, idlHeader):
        self.name = name
        self.comment = comment
        self.tables = tables
        self.idlPrefix = idlPrefix
        self.idlHeader = idlHeader

    @staticmethod
    def fromJson(json):
        name = mustGetMember(json, 'name', [unicode], 'database')
        comment = getMember(json, 'comment', [unicode], 'database')
        tablesJson = mustGetMember(json, 'tables', [dict], 'database')
        tables = {}
        for tableName, tableJson in tablesJson.iteritems():
            tables[tableName] = TableSchema.fromJson(tableJson,
                                                     "%s table" % tableName)
        idlPrefix = mustGetMember(json, 'idlPrefix', [unicode], 'database')
        idlHeader = mustGetMember(json, 'idlHeader', [unicode], 'database')
        return DbSchema(name, comment, tables, idlPrefix, idlHeader)

    def toJson(self):
        d = {"name": self.name,
             "tables": {}}
        for name, table in self.tables.iteritems():
            d["tables"][name] = table.toJson()
        if self.comment != None:
            d["comment"] = self.comment
        return d

class TableSchema:
    def __init__(self, comment, columns):
        self.comment = comment
        self.columns = columns

    @staticmethod
    def fromJson(json, description):
        comment = getMember(json, 'comment', [unicode], description)
        columnsJson = mustGetMember(json, 'columns', [dict], description)
        columns = {}
        for name, json in columnsJson.iteritems():
            columns[name] = ColumnSchema.fromJson(
                json, "column %s in %s" % (name, description))
        return TableSchema(comment, columns)

    def toJson(self):
        d = {"columns": {}}
        for name, column in self.columns.iteritems():
            d["columns"][name] = column.toJson()
        if self.comment != None:
            d["comment"] = self.comment
        return d

class ColumnSchema:
    def __init__(self, comment, type, persistent):
        self.comment = comment
        self.type = type
        self.persistent = persistent

    @staticmethod
    def fromJson(json, description):
        comment = getMember(json, 'comment', [unicode], description)
        type = Type.fromJson(mustGetMember(json, 'type', [dict, unicode],
                                           description),
                             'type of %s' % description)
        ephemeral = getMember(json, 'ephemeral', [bool], description)
        persistent = ephemeral != True
        return ColumnSchema(comment, type, persistent)

    def toJson(self):
        d = {"type": self.type.toJson()}
        if self.persistent == False:
            d["ephemeral"] = True
        if self.comment != None:
            d["comment"] = self.comment
        return d

class Type:
    def __init__(self, key, keyRefTable=None, value=None, valueRefTable=None,
                 min=1, max=1):
        self.key = key
        self.keyRefTable = keyRefTable
        self.value = value
        self.valueRefTable = valueRefTable
        self.min = min
        self.max = max
    
    @staticmethod
    def fromJson(json, description):
        if type(json) == unicode:
            return Type(json)
        else:
            key = mustGetMember(json, 'key', [unicode], description)
            keyRefTable = getMember(json, 'keyRefTable', [unicode], description)
            value = getMember(json, 'value', [unicode], description)
            valueRefTable = getMember(json, 'valueRefTable', [unicode], description)
            min = getMember(json, 'min', [int], description, 1)
            max = getMember(json, 'max', [int, unicode], description, 1)
            return Type(key, keyRefTable, value, valueRefTable, min, max)

    def toJson(self):
        if self.value == None and self.min == 1 and self.max == 1:
            return self.key
        else:
            d = {"key": self.key}
            if self.value != None:
                d["value"] = self.value
            if self.min != 1:
                d["min"] = self.min
            if self.max != 1:
                d["max"] = self.max
            return d

    def isScalar(self):
        return self.min == 1 and self.max == 1 and not self.value

    def isOptional(self):
        return self.min == 0 and self.max == 1

    def toEnglish(self):
        keyName = atomicTypeToEnglish(self.key, self.keyRefTable)
        if self.value:
            valueName = atomicTypeToEnglish(self.value, self.valueRefTable)

        if self.isScalar():
            return atomicTypeToEnglish(self.key, self.keyRefTable)
        elif self.isOptional():
            if self.value:
                return "optional %s-%s pair" % (keyName, valueName)
            else:
                return "optional %s" % keyName
        else:
            if self.max == "unlimited":
                if self.min:
                    quantity = "%d or more " % self.min
                else:
                    quantity = ""
            elif self.min:
                quantity = "%d to %d " % (self.min, self.max)
            else:
                quantity = "up to %d " % self.max

            if self.value:
                return "map of %s%s-%s pairs" % (quantity, keyName, valueName)
            else:
                return "set of %s%s" % (quantity, keyName)
                

def atomicTypeToEnglish(base, refTable):
    if base == 'uuid' and refTable:
        return refTable
    else:
        return base

def parseSchema(filename):
    return DbSchema.fromJson(json.load(open(filename, "r")))

def annotateSchema(schemaFile, annotationFile):
    schemaJson = json.load(open(schemaFile, "r"))
    execfile(annotationFile, globals(), {"s": schemaJson})
    json.dump(schemaJson, sys.stdout)

def cBaseType(prefix, type, refTable=None):
    if type == 'uuid' and refTable:
        return "struct %s%s *" % (prefix, refTable.lower())
    else:
        return {'integer': 'int64_t ',
                'real': 'double ',
                'uuid': 'struct uuid ',
                'boolean': 'bool ',
                'string': 'char *'}[type]

def cCopyType(indent, dstVar, dst, src, type, refTable=None):
    args = {'indent': indent,
            'dstVar': dstVar,
            'dst': dst,
            'src': src}
    if type == 'uuid' and refTable:
        return ("%(indent)s%(dstVar)s = %(src)s;\n" +
                "%(indent)s%(dst)s = %(src)s->header_.uuid;") % args
    elif type == 'string':
        return "%(indent)s%(dstVar)s = %(dst)s = xstrdup(%(src)s);" % args
    else:
        return "%(dstVar)s = %(dst)s = %(src)s;" % args

def typeIsOptionalPointer(type):
    return (type.min == 0 and type.max == 1 and not type.value
            and (type.key == 'string'
                 or (type.key == 'uuid' and type.keyRefTable)))

def cDeclComment(type):
    if type.min == 1 and type.max == 1 and type.key == "string":
        return "\t/* Always nonnull. */"
    else:
        return ""

def constify(cType, const):
    if (const
        and cType.endswith('*') and not cType.endswith('**')
        and (cType.startswith('struct uuid') or cType.startswith('char'))):
        return 'const %s' % cType
    else:
        return cType

def cMembers(prefix, columnName, column, const):
    type = column.type
    if type.min == 1 and type.max == 1:
        singleton = True
        pointer = ''
    else:
        singleton = False
        if typeIsOptionalPointer(type):
            pointer = ''
        else:
            pointer = '*'

    if type.value:
        key = {'name': "key_%s" % columnName,
               'type': constify(cBaseType(prefix, type.key, type.keyRefTable) + pointer, const),
               'comment': ''}
        value = {'name': "value_%s" % columnName,
                 'type': constify(cBaseType(prefix, type.value, type.valueRefTable) + pointer, const),
                 'comment': ''}
        members = [key, value]
    else:
        m = {'name': columnName,
             'type': constify(cBaseType(prefix, type.key, type.keyRefTable) + pointer, const),
             'comment': cDeclComment(type)}
        members = [m]

    if not singleton and not typeIsOptionalPointer(type):
        members.append({'name': 'n_%s' % columnName,
                        'type': 'size_t ',
                        'comment': ''})
    return members

def printCIDLHeader(schemaFile):
    schema = parseSchema(schemaFile)
    prefix = schema.idlPrefix
    print '''\
/* Generated automatically -- do not modify!    -*- buffer-read-only: t -*- */

#ifndef %(prefix)sIDL_HEADER
#define %(prefix)sIDL_HEADER 1

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "ovsdb-idl-provider.h"
#include "uuid.h"''' % {'prefix': prefix.upper()}
    for tableName, table in schema.tables.iteritems():
        print
        print "/* %s table. */" % tableName
        structName = "%s%s" % (prefix, tableName.lower())
        print "struct %s {" % structName
        print "\tstruct ovsdb_idl_row header_;"
        for columnName, column in table.columns.iteritems():
            print "\n\t/* %s column. */" % columnName
            for member in cMembers(prefix, columnName, column, False):
                print "\t%(type)s%(name)s;%(comment)s" % member
        print '''\
};

const struct %(s)s *%(s)s_first(const struct ovsdb_idl *);
const struct %(s)s *%(s)s_next(const struct %(s)s *);
#define %(S)s_FOR_EACH(ROW, IDL) for ((ROW) = %(s)s_first(IDL); (ROW); (ROW) = %(s)s_next(ROW))

void %(s)s_delete(const struct %(s)s *);
struct %(s)s *%(s)s_insert(struct ovsdb_idl_txn *);
''' % {'s': structName, 'S': structName.upper()}

        for columnName, column in table.columns.iteritems():
            print 'void %(s)s_verify_%(c)s(const struct %(s)s *);' % {'s': structName, 'c': columnName}

        print
        for columnName, column in table.columns.iteritems():

            print 'void %(s)s_set_%(c)s(const struct %(s)s *,' % {'s': structName, 'c': columnName},
            args = ['%(type)s%(name)s' % member for member
                    in cMembers(prefix, columnName, column, True)]
            print '%s);' % ', '.join(args)

    print "\nextern struct ovsdb_idl_class %sidl_class;" % prefix
    print "\n#endif /* %(prefix)sIDL_HEADER */" % {'prefix': prefix.upper()}

def printEnum(members):
    if len(members) == 0:
        return

    print "\nenum {";
    for member in members[:-1]:
        print "    %s," % member
    print "    %s" % members[-1]
    print "};"

def printCIDLSource(schemaFile):
    schema = parseSchema(schemaFile)
    prefix = schema.idlPrefix
    print '''\
/* Generated automatically -- do not modify!    -*- buffer-read-only: t -*- */

#include <config.h>
#include %s
#include <limits.h>
#include "ovsdb-data.h"''' % schema.idlHeader

    # Table indexes.
    printEnum(["%sTABLE_%s" % (prefix.upper(), tableName.upper()) for tableName in schema.tables] + ["%sN_TABLES" % prefix.upper()])
    print "\nstatic struct ovsdb_idl_table_class %stable_classes[%sN_TABLES];" % (prefix, prefix.upper())

    # Cast functions.
    for tableName, table in schema.tables.iteritems():
        structName = "%s%s" % (prefix, tableName.lower())
        print '''
static struct %(s)s *
%(s)s_cast(struct ovsdb_idl_row *row)
{
    return row ? CONTAINER_OF(row, struct %(s)s, header_) : NULL;
}\
''' % {'s': structName}


    for tableName, table in schema.tables.iteritems():
        structName = "%s%s" % (prefix, tableName.lower())
        print ""
        if table.comment != None:
            print "/* %s table (%s). */" % (tableName, table.comment)
        else:
            print "/* %s table. */" % (tableName)

        # Column indexes.
        printEnum(["%s_COL_%s" % (structName.upper(), columnName.upper())
                   for columnName in table.columns]
                  + ["%s_N_COLUMNS" % structName.upper()])

        print "\nstatic struct ovsdb_idl_column %s_columns[];" % structName

        # Parse function.
        print '''
static void
%s_parse(struct ovsdb_idl_row *row_)
{
    struct %s *row = %s_cast(row_);
    const struct ovsdb_datum *datum;
    size_t i UNUSED;

    memset(row_ + 1, 0, sizeof *row - sizeof *row_);''' % (structName, structName, structName)


        for columnName, column in table.columns.iteritems():
            type = column.type
            refKey = type.key == "uuid" and type.keyRefTable
            refValue = type.value == "uuid" and type.valueRefTable
            print
            print "    datum = &row_->old[%s_COL_%s];" % (structName.upper(), columnName.upper())
            if type.value:
                keyVar = "row->key_%s" % columnName
                valueVar = "row->value_%s" % columnName
            else:
                keyVar = "row->%s" % columnName
                valueVar = None

            if (type.min == 1 and type.max == 1) or typeIsOptionalPointer(type):
                print "    if (datum->n >= 1) {"
                if not refKey:
                    print "        %s = datum->keys[0].%s;" % (keyVar, type.key)
                else:
                    print "        %s = %s%s_cast(ovsdb_idl_get_row_arc(row_, &%stable_classes[%sTABLE_%s], &datum->keys[0].uuid));" % (keyVar, prefix, type.keyRefTable.lower(), prefix, prefix.upper(), type.keyRefTable.upper())

                if valueVar:
                    if refValue:
                        print "        %s = datum->values[0].%s;" % (valueVar, type.value)
                    else:
                        print "        %s = %s%s_cast(ovsdb_idl_get_row_arc(row_, &%stable_classes[%sTABLE_%s], &datum->values[0].uuid));" % (valueVar, prefix, type.valueRefTable.lower(), prefix, prefix.upper(), type.valueRefTable.upper())
                if (not typeIsOptionalPointer(type) and
                    (type.key == "string" or type.value == "string")):
                    print "    } else {"
                    if type.key == "string":
                        print "        %s = \"\";" % keyVar
                    if type.value == "string":
                        print "        %s = \"\";" % valueVar
                print "    }"

            else:
                if type.max != 'unlimited':
                    nMax = "MIN(%d, datum->n)" % type.max
                else:
                    nMax = "datum->n"
                print "    for (i = 0; i < %s; i++) {" % nMax
                refs = []
                if refKey:
                    print "        struct %s%s *keyRow = %s%s_cast(ovsdb_idl_get_row_arc(row_, &%stable_classes[%sTABLE_%s], &datum->keys[i].uuid));" % (prefix, type.keyRefTable.lower(), prefix, type.keyRefTable.lower(), prefix, prefix.upper(), type.keyRefTable.upper())
                    keySrc = "keyRow"
                    refs.append('keyRow')
                else:
                    keySrc = "datum->keys[i].%s" % type.key
                if refValue:
                    print "        struct %s%s *valueRow = %s%s_cast(ovsdb_idl_get_row_arc(row_, &%stable_classes[%sTABLE_%s], &datum->values[i].uuid));" % (prefix, type.valueRefTable.lower(), prefix, type.valueRefTable.lower(), prefix, prefix.upper(), type.valueRefTable.upper())
                    valueSrc = "valueRow"
                    refs.append('valueRow')
                elif valueVar:
                    valueSrc = "datum->values[i].%s" % type.value
                if refs:
                    print "        if (%s) {" % ' && '.join(refs)
                    indent = "            "
                else:
                    indent = "        "
                print "%sif (!row->n_%s) {" % (indent, columnName)
                print "%s    %s = xmalloc(%s * sizeof *%s);" % (indent, keyVar, nMax, keyVar)
                if valueVar:
                    print "%s    %s = xmalloc(%s * sizeof %s);" % (indent, valueVar, nMax, valueVar)
                print "%s}" % indent
                print "%s%s[row->n_%s] = %s;" % (indent, keyVar, columnName, keySrc)
                if valueVar:
                    print "%s%s[row->n_%s] = %s;" % (indent, valueVar, columnName, valueSrc)
                print "%srow->n_%s++;" % (indent, columnName)
                if refs:
                    print "        }"
                print "    }"
        print "}"

        # Unparse function.
        nArrays = 0
        for columnName, column in table.columns.iteritems():
            type = column.type
            if (type.min != 1 or type.max != 1) and not typeIsOptionalPointer(type):
                if not nArrays:
                    print '''
static void
%s_unparse(struct ovsdb_idl_row *row_)
{
    struct %s *row = %s_cast(row_);
''' % (structName, structName, structName)
                if type.value:
                    keyVar = "row->key_%s" % columnName
                    valueVar = "row->value_%s" % columnName
                else:
                    keyVar = "row->%s" % columnName
                    valueVar = None
                print "    free(%s);" % keyVar
                if valueVar:
                    print "    free(%s);" % valueVar
                nArrays += 1
        if not nArrays:
            print '''
static void
%s_unparse(struct ovsdb_idl_row *row UNUSED)
{''' % (structName)
        print "}"

        # First, next functions.
        print '''
const struct %(s)s *
%(s)s_first(const struct ovsdb_idl *idl)
{
    return %(s)s_cast(ovsdb_idl_first_row(idl, &%(p)stable_classes[%(P)sTABLE_%(T)s]));
}

const struct %(s)s *
%(s)s_next(const struct %(s)s *row)
{
    return %(s)s_cast(ovsdb_idl_next_row(&row->header_));
}''' % {'s': structName,
        'p': prefix,
        'P': prefix.upper(),
        'T': tableName.upper()}

        print '''
void
%(s)s_delete(const struct %(s)s *row_)
{
    struct %(s)s *row = (struct %(s)s *) row_;
    ovsdb_idl_txn_delete(&row->header_);
}

struct %(s)s *
%(s)s_insert(struct ovsdb_idl_txn *txn)
{
    return %(s)s_cast(ovsdb_idl_txn_insert(txn, &%(p)stable_classes[%(P)sTABLE_%(T)s]));
}
''' % {'s': structName,
       'p': prefix,
       'P': prefix.upper(),
       'T': tableName.upper()}

        # Verify functions.
        for columnName, column in table.columns.iteritems():
            print '''
void
%(s)s_verify_%(c)s(const struct %(s)s *row)
{
    ovsdb_idl_txn_verify(&row->header_, &%(s)s_columns[%(S)s_COL_%(C)s]);
}''' % {'s': structName,
        'S': structName.upper(),
        'c': columnName,
        'C': columnName.upper()}

        # Set functions.
        for columnName, column in table.columns.iteritems():
            type = column.type
            print '\nvoid'
            members = cMembers(prefix, columnName, column, True)
            keyVar = members[0]['name']
            nVar = None
            valueVar = None
            if type.value:
                valueVar = members[1]['name']
                if len(members) > 2:
                    nVar = members[2]['name']
            else:
                if len(members) > 1:
                    nVar = members[1]['name']
            print '%(s)s_set_%(c)s(const struct %(s)s *row_, %(args)s)' % \
                {'s': structName, 'c': columnName,
                 'args': ', '.join(['%(type)s%(name)s' % m for m in members])}
            print "{"
            print "    struct %(s)s *row = (struct %(s)s *) row_;" % {'s': structName}
            print "    struct ovsdb_datum datum;"
            if type.min == 1 and type.max == 1:
                print
                print "    datum.n = 1;"
                print "    datum.keys = xmalloc(sizeof *datum.keys);"
                print cCopyType("    ", "row->%s" % keyVar, "datum.keys[0].%s" % type.key, keyVar, type.key, type.keyRefTable)
                if type.value:
                    print "    datum.values = xmalloc(sizeof *datum.values);"
                    print cCopyType("    ", "row->%s" % valueVar, "datum.values[0].%s" % type.value, valueVar, type.value, type.valueRefTable)
                else:
                    print "    datum.values = NULL;"
            elif typeIsOptionalPointer(type):
                print
                print "    if (%s) {" % keyVar
                print "        datum.n = 1;"
                print "        datum.keys = xmalloc(sizeof *datum.keys);"
                print cCopyType("        ", "row->%s" % keyVar, "datum.keys[0].%s" % type.key, keyVar, type.key, type.keyRefTable)
                print "    } else {"
                print "        datum.n = 0;"
                print "        datum.keys = NULL;"
                print "        row->%s = NULL;" % keyVar
                print "    }"
                print "    datum.values = NULL;"
            else:
                print "    size_t i;"
                print
                print "    free(row->%s);" % keyVar
                print "    row->%s = %s ? xmalloc(%s * sizeof *row->%s) : NULL;" % (keyVar, nVar, nVar, keyVar)
                print "    row->%s = %s;" % (nVar, nVar)
                if type.value:
                    print "    free(row->%s);" % valueVar
                    print "    row->%s = xmalloc(%s * sizeof *row->%s);" % (valueVar, nVar, valueVar)
                print "    datum.n = %s;" % nVar
                print "    datum.keys = xmalloc(%s * sizeof *datum.keys);" % nVar
                if type.value:
                    print "    datum.values = xmalloc(%s * sizeof *datum.values);" % nVar
                else:
                    print "    datum.values = NULL;"
                print "    for (i = 0; i < %s; i++) {" % nVar
                print cCopyType("        ", "row->%s[i]" % keyVar, "datum.keys[i].%s" % type.key, "%s[i]" % keyVar, type.key, type.keyRefTable)
                if type.value:
                    print cCopyType("        ", "row->%s[i]" % valueVar, "datum.values[i].%s" % type.value, "%s[i]" % valueVar, type.value, type.valueRefTable)
                print "    }"
            print "    ovsdb_idl_txn_write(&row->header_, &%(s)s_columns[%(S)s_COL_%(C)s], &datum);" \
                % {'s': structName,
                   'S': structName.upper(),
                   'C': columnName.upper()}
            print "}"

        # Table columns.
        print "\nstatic struct ovsdb_idl_column %s_columns[%s_N_COLUMNS] = {" % (
            structName, structName.upper())
        for columnName, column in table.columns.iteritems():
            type = column.type
            
            if type.value:
                valueTypeName = type.value.upper()
            else:
                valueTypeName = "VOID"
            if type.max == "unlimited":
                max = "UINT_MAX"
            else:
                max = type.max
            print "    {\"%s\", {OVSDB_TYPE_%s, OVSDB_TYPE_%s, %d, %s}}," % (
                columnName, type.key.upper(), valueTypeName,
                type.min, max)
        print "};"

    # Table classes.
    print ""
    print "static struct ovsdb_idl_table_class %stable_classes[%sN_TABLES] = {" % (prefix, prefix.upper())
    for tableName, table in schema.tables.iteritems():
        structName = "%s%s" % (prefix, tableName.lower())
        print "    {\"%s\"," % tableName
        print "     %s_columns, ARRAY_SIZE(%s_columns)," % (
            structName, structName)
        print "     sizeof(struct %s)," % structName
        print "     %s_parse," % structName
        print "     %s_unparse}," % structName
    print "};"

    # IDL class.
    print "\nstruct ovsdb_idl_class %sidl_class = {" % prefix
    print "    %stable_classes, ARRAY_SIZE(%stable_classes)" % (prefix, prefix)
    print "};"

def ovsdb_escape(string):
    def escape(match):
        c = match.group(0)
        if c == '\0':
            raise Error("strings may not contain null bytes")
        elif c == '\\':
            return '\\\\'
        elif c == '\n':
            return '\\n'
        elif c == '\r':
            return '\\r'
        elif c == '\t':
            return '\\t'
        elif c == '\b':
            return '\\b'
        elif c == '\a':
            return '\\a'
        else:
            return '\\x%02x' % ord(c)
    return re.sub(r'["\\\000-\037]', escape, string)

def printDoc(schemaFile):
    schema = parseSchema(schemaFile)
    print schema.name
    if schema.comment:
        print schema.comment

    for tableName, table in sorted(schema.tables.iteritems()):
        title = "%s table" % tableName
        print
        print title
        print '-' * len(title)
        if table.comment:
            print table.comment

        for columnName, column in sorted(table.columns.iteritems()):
            print
            print "%s (%s)" % (columnName, column.type.toEnglish())
            if column.comment:
                print "\t%s" % column.comment

def usage():
    print """\
%(argv0)s: ovsdb schema compiler
usage: %(argv0)s [OPTIONS] COMMAND ARG...

The following commands are supported:
  annotate SCHEMA ANNOTATIONS print SCHEMA combined with ANNOTATIONS
  c-idl-header IDL            print C header file for IDL
  c-idl-source IDL            print C source file for IDL implementation
  doc IDL                     print schema documentation

The following options are also available:
  -h, --help                  display this help message
  -V, --version               display version information\
""" % {'argv0': argv0}
    sys.exit(0)

if __name__ == "__main__":
    try:
        try:
            options, args = getopt.gnu_getopt(sys.argv[1:], 'C:hV',
                                              ['directory',
                                               'help',
                                               'version'])
        except getopt.GetoptError, geo:
            sys.stderr.write("%s: %s\n" % (argv0, geo.msg))
            sys.exit(1)
            
        for key, value in options:
            if key in ['-h', '--help']:
                usage()
            elif key in ['-V', '--version']:
                print "ovsdb-idlc (Open vSwitch) @VERSION@"
            elif key in ['-C', '--directory']:
                os.chdir(value)
            else:
                sys.exit(0)
            
        optKeys = [key for key, value in options]

        if not args:
            sys.stderr.write("%s: missing command argument "
                             "(use --help for help)\n" % argv0)
            sys.exit(1)

        commands = {"annotate": (annotateSchema, 2),
                    "c-idl-header": (printCIDLHeader, 1),
                    "c-idl-source": (printCIDLSource, 1),
                    "doc": (printDoc, 1)}

        if not args[0] in commands:
            sys.stderr.write("%s: unknown command \"%s\" "
                             "(use --help for help)\n" % (argv0, args[0]))
            sys.exit(1)

        func, n_args = commands[args[0]]
        if len(args) - 1 != n_args:
            sys.stderr.write("%s: \"%s\" requires %d arguments but %d "
                             "provided\n"
                             % (argv0, args[0], n_args, len(args) - 1))
            sys.exit(1)

        func(*args[1:])
    except Error, e:
        sys.stderr.write("%s: %s\n" % (argv0, e.msg))
        sys.exit(1)

# Local variables:
# mode: python
# End: