Created
December 30, 2011 19:44
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libmusicbrainz4: converting cinterface.xml to .vapi file
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| #!/usr/bin/env python | |
| import xml.etree.ElementTree | |
| # in order for this script to work, manually do the following: | |
| # 1) delete extraneous 'uppername="PUID"' at line 205 of cinterface.xml | |
| # 2) delete '------------ ... ----' lines (there're 2 of them) | |
| def un_camel(text): # slightly modified piece of code from StackOverflow.com | |
| result, length = "", len(text) | |
| for pos in range(length): | |
| if text[pos].isupper(): | |
| if pos > 1 and text[pos-1].islower() or \ | |
| pos > 1 and pos+1 < length and text[pos+1].islower(): | |
| result += "_" | |
| result += text[pos].lower() | |
| return result | |
| ################################################################################ | |
| def capitalize(node): | |
| return node.attrib.get('uppername') or node.attrib['name'].capitalize() | |
| SHIFT_WIDTH = 4 | |
| class XMLVisitor: | |
| def __init__(self, infile='cinterface.xml', | |
| outfile='libmusicbrainz4.vapi', | |
| uncamel=True): | |
| xml_contents = open(infile).read() | |
| self.root = xml.etree.ElementTree.fromstring(xml_contents) | |
| self.out = open(outfile, 'w+') | |
| self.indent = -SHIFT_WIDTH | |
| self.uncamel = uncamel # determines whether to leave names like 'usertaglist' | |
| # or to convert to 'user_tag_list' based on | |
| # information available in XML file | |
| self.current_namespace = 'mb4' | |
| self.current_classname = '' | |
| def incr(self): | |
| self.indent += SHIFT_WIDTH | |
| def decr(self): | |
| self.indent -= SHIFT_WIDTH | |
| def process(self): | |
| self.visit(self.root) | |
| def writeln(self, str=''): | |
| self.out.write(' ' * self.indent) | |
| self.out.write(str) | |
| self.out.write('\n') | |
| def visit(self, node): | |
| tag = node.tag | |
| self.incr() | |
| if tag == 'cinterface': | |
| self.visit_cinterface(node) | |
| elif tag == 'class': | |
| self.visit_class(node) | |
| elif tag == 'property': | |
| self.visit_property(node) | |
| elif tag == 'list': | |
| self.visit_list(node) | |
| elif tag == 'boilerplate': | |
| # FIXME! | |
| pass | |
| elif tag == 'entity': | |
| self.visit_entity() | |
| else: | |
| # print ('unknown tag: %s - skipped' % tag) | |
| pass | |
| self.decr() | |
| def visit_cinterface(self, node): | |
| namespace = self.current_namespace | |
| self.writeln ('[CCode (cheader_filename = "musicbrainz4/mb4_c.h")]') | |
| self.writeln ('namespace %s {' % namespace.capitalize()) | |
| for child in node.getchildren (): | |
| self.visit (child) | |
| self.writeln ('}') | |
| def visit_class(self, node): | |
| classname = node.attrib['name'] | |
| self.current_classname = classname | |
| uppername = capitalize (node) | |
| namespace = self.current_namespace | |
| self.writeln ('[Compact]') | |
| self.writeln ('[CCode (free_function = "%s_%s_delete", lower_case_cprefix = "%s_%s_")]' % | |
| (namespace, classname, namespace, classname)) | |
| self.writeln ('public class %s : Entity {' % uppername) | |
| self.incr () | |
| self.writeln ('[CCode (cname = "%s_%s_clone")]' % (namespace, classname)) | |
| self.writeln ('public %s.copy(%s %s);' % (uppername, uppername, classname)) | |
| self.decr () | |
| for child in node.getchildren (): | |
| self.visit (child) | |
| self.writeln ('}\n') | |
| def visit_property(self, node): | |
| name = node.attrib['name'] | |
| uppername = capitalize (node) | |
| type = node.attrib['type'] | |
| namespace = self.current_namespace | |
| classname = self.current_classname | |
| if self.uncamel: | |
| uncameled_name = un_camel (uppername) | |
| else: | |
| uncameled_name = name | |
| if type == 'string': | |
| self.writeln () | |
| self.writeln ('[CCode (cname = "%s_%s_get_%s")]' % | |
| (namespace, classname, name)) | |
| self.writeln ('public int get_%s_array(char[]? str);' % uncameled_name) | |
| self.writeln ('public string %s {' % uncameled_name) | |
| self.incr () | |
| self.writeln ('[CCode (cname = "%s_%s_get_%s_wrapper")]' % | |
| (namespace, classname, name)) | |
| self.writeln ('owned get {') | |
| self.incr () | |
| self.writeln ('int size = get_%s_array(null);' % uncameled_name) | |
| self.writeln ('char[] buf = new char[size+1];') | |
| self.writeln ('get_%s_array(buf);' % uncameled_name) | |
| self.writeln ('return (string) buf;') | |
| self.decr () | |
| self.writeln ('}') | |
| self.decr () | |
| self.writeln ('}') | |
| elif type == 'object': | |
| self.writeln ('public %s? %s { ' % (uppername, uncameled_name)) | |
| self.incr () | |
| self.writeln ('[CCode (cname = "%s_%s_get_%s")]' % | |
| (namespace, classname, name)) | |
| self.writeln ('get;') | |
| self.decr () | |
| self.writeln ('}') | |
| elif type == 'integer' or type == 'double': | |
| self.writeln ('public %s %s { ' % | |
| ("int" if type == "integer" else "double", | |
| uncameled_name)) | |
| self.incr () | |
| self.writeln ('[CCode (cname = "%s_%s_get_%s")]' % | |
| (namespace, classname, name)) | |
| self.writeln ('get;') | |
| self.decr () | |
| self.writeln ('}') | |
| else: | |
| print ('unknown type of property: "%s" - skipped' % type) | |
| pass | |
| def visit_list(self, node): | |
| element_name = node.attrib['name'] | |
| element_uppername = capitalize (node) | |
| namespace = self.current_namespace; | |
| classname = element_uppername + "List" | |
| lowercase_classname = element_name + "_list" | |
| self.writeln ('[Compact]') | |
| self.writeln ('[CCode (free_function = "%s_%s_delete")]' % | |
| (namespace, lowercase_classname)) | |
| self.writeln ('public class %s : Entity {' % classname) | |
| self.incr () | |
| self.writeln ('public int size {') | |
| self.incr () | |
| self.writeln ('[CCode (cname = "%s_%s_size")]' % | |
| (namespace, lowercase_classname)) | |
| self.writeln ('get;') | |
| self.decr () | |
| self.writeln ('}') | |
| self.writeln ('[CCode (cname = "%s_%s_item")]' % | |
| (namespace, lowercase_classname)) | |
| self.writeln ('public unowned %s get(int item);' % element_uppername) | |
| self.writeln ('public int count { get; }'); | |
| self.writeln ('public int offset { get; }'); | |
| self.writeln ('[CCode (cname = "%s_%s_clone")]' % | |
| (namespace, lowercase_classname)) | |
| self.writeln ('public %s.copy(%s %s);' % | |
| (classname, classname, lowercase_classname)) | |
| self.decr () | |
| self.current_classname = lowercase_classname # there might be properties | |
| for child in node.getchildren (): | |
| self.visit (child) | |
| self.writeln ('}') | |
| self.writeln () | |
| def visit_entity(self): # let's just hardcode this class | |
| classname = "entity" | |
| namespace = self.current_namespace | |
| def helper(name, prefix): | |
| self.writeln ('[CCode (cname = "%s_%s_%s_%s")]' % | |
| (namespace, classname, prefix, name)) | |
| self.writeln ('public int %s_%s_array(int item, char[]? str);' % | |
| (prefix, name)) | |
| self.writeln ('[CCode (cname = "%s_%s_%s_%s_wrapper")]' % | |
| (namespace, classname, prefix, name)) | |
| self.writeln ('public string %s_%s(int item) {' % (prefix, name)) | |
| self.incr () | |
| self.writeln ('int size = %s_%s_array(item, null);' % (prefix, name)) | |
| self.writeln ('char[] buf = new char[size+1];') | |
| self.writeln ('%s_%s_array(item, buf);' % (prefix, name)) | |
| self.writeln ('return (string) buf;') | |
| self.decr () | |
| self.writeln ('}') | |
| self.writeln ('[Compact]') | |
| self.writeln ('public class Entity {') | |
| self.incr () | |
| self.writeln ('public int ext_attributes_size();') | |
| helper ("name", "ext_attribute") | |
| helper ("value", "ext_attribute") | |
| self.writeln ('public int ext_elements_size();') | |
| helper ("name", "ext_element") | |
| helper ("value", "ext_element") | |
| self.decr () | |
| self.writeln ('}') | |
| self.writeln () | |
| if __name__ == "__main__": | |
| v = XMLVisitor() | |
| v.process() |
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