qapi: add qapi.py helper libraries

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@gmail.com>

scripts/qapi.py

+#
+# QAPI helper library
+#
+# Copyright IBM, Corp. 2011
+#
+# Authors:
+#  Anthony Liguori <aliguori@us.ibm.com>
+#
+# This work is licensed under the terms of the GNU GPLv2.
+# See the COPYING.LIB file in the top-level directory.
+
+from ordereddict import OrderedDict
+
+def tokenize(data):
+    while len(data):
+        if data[0] in ['{', '}', ':', ',', '[', ']']:
+            yield data[0]
+            data = data[1:]
+        elif data[0] in ' \n':
+            data = data[1:]
+        elif data[0] == "'":
+            data = data[1:]
+            string = ''
+            while data[0] != "'":
+                string += data[0]
+                data = data[1:]
+            data = data[1:]
+            yield string
+
+def parse(tokens):
+    if tokens[0] == '{':
+        ret = OrderedDict()
+        tokens = tokens[1:]
+        while tokens[0] != '}':
+            key = tokens[0]
+            tokens = tokens[1:]
+
+            tokens = tokens[1:] # :
+
+            value, tokens = parse(tokens)
+
+            if tokens[0] == ',':
+                tokens = tokens[1:]
+
+            ret[key] = value
+        tokens = tokens[1:]
+        return ret, tokens
+    elif tokens[0] == '[':
+        ret = []
+        tokens = tokens[1:]
+        while tokens[0] != ']':
+            value, tokens = parse(tokens)
+            if tokens[0] == ',':
+                tokens = tokens[1:]
+            ret.append(value)
+        tokens = tokens[1:]
+        return ret, tokens
+    else:
+        return tokens[0], tokens[1:]
+
+def evaluate(string):
+    return parse(map(lambda x: x, tokenize(string)))[0]
+
+def parse_schema(fp):
+    exprs = []
+    expr = ''
+    expr_eval = None
+
+    for line in fp:
+        if line.startswith('#') or line == '\n':
+            continue
+
+        if line.startswith(' '):
+            expr += line
+        elif expr:
+            expr_eval = evaluate(expr)
+            if expr_eval.has_key('enum'):
+                add_enum(expr_eval['enum'])
+            elif expr_eval.has_key('union'):
+                add_enum('%sKind' % expr_eval['union'])
+            exprs.append(expr_eval)
+            expr = line
+        else:
+            expr += line
+
+    if expr:
+        expr_eval = evaluate(expr)
+        if expr_eval.has_key('enum'):
+            add_enum(expr_eval['enum'])
+        elif expr_eval.has_key('union'):
+            add_enum('%sKind' % expr_eval['union'])
+        exprs.append(expr_eval)
+
+    return exprs
+
+def parse_args(typeinfo):
+    for member in typeinfo:
+        argname = member
+        argentry = typeinfo[member]
+        optional = False
+        structured = False
+        if member.startswith('*'):
+            argname = member[1:]
+            optional = True
+        if isinstance(argentry, OrderedDict):
+            structured = True
+        yield (argname, argentry, optional, structured)
+
+def de_camel_case(name):
+    new_name = ''
+    for ch in name:
+        if ch.isupper() and new_name:
+            new_name += '_'
+        if ch == '-':
+            new_name += '_'
+        else:
+            new_name += ch.lower()
+    return new_name
+
+def camel_case(name):
+    new_name = ''
+    first = True
+    for ch in name:
+        if ch in ['_', '-']:
+            first = True
+        elif first:
+            new_name += ch.upper()
+            first = False
+        else:
+            new_name += ch.lower()
+    return new_name
+
+def c_var(name):
+    return '_'.join(name.split('-')).lstrip("*")
+
+def c_list_type(name):
+    return '%sList' % name
+
+def type_name(name):
+    if type(name) == list:
+        return c_list_type(name[0])
+    return name
+
+enum_types = []
+
+def add_enum(name):
+    global enum_types
+    enum_types.append(name)
+
+def is_enum(name):
+    global enum_types
+    return (name in enum_types)
+
+def c_type(name):
+    if name == 'str':
+        return 'char *'
+    elif name == 'int':
+        return 'int64_t'
+    elif name == 'bool':
+        return 'bool'
+    elif name == 'number':
+        return 'double'
+    elif type(name) == list:
+        return '%s *' % c_list_type(name[0])
+    elif is_enum(name):
+        return name
+    elif name == None or len(name) == 0:
+        return 'void'
+    elif name == name.upper():
+        return '%sEvent *' % camel_case(name)
+    else:
+        return '%s *' % name
+
+def genindent(count):
+    ret = ""
+    for i in range(count):
+        ret += " "
+    return ret
+
+indent_level = 0
+
+def push_indent(indent_amount=4):
+    global indent_level
+    indent_level += indent_amount
+
+def pop_indent(indent_amount=4):
+    global indent_level
+    indent_level -= indent_amount
+
+def cgen(code, **kwds):
+    indent = genindent(indent_level)
+    lines = code.split('\n')
+    lines = map(lambda x: indent + x, lines)
+    return '\n'.join(lines) % kwds + '\n'
+
+def mcgen(code, **kwds):
+    return cgen('\n'.join(code.split('\n')[1:-1]), **kwds)
+
+def basename(filename):
+    return filename.split("/")[-1]
+
+def guardname(filename):
+    return filename.replace("/", "_").replace("-", "_").split(".")[0].upper()