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query_gen.py
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231 lines (207 loc) · 8.42 KB
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#Parse the dbscheme file
#Look for comments or declarations ending with ';'
import sys
import os.path
from semmle.python import master
def singularize(name):
if name and name[-1] == 's':
return name[:-1]
elif name.endswith('_list'):
return name[:-5]
elif name.endswith('body'):
return name[:-4] + 'stmt'
else:
return name
def singularize_text(name):
if name.endswith('block'):
return name[:-5] + 'statement'
elif name.endswith('body'):
return name[:-4] + 'statement'
elif name.endswith(' list'):
return name[:-5]
else:
return singularize(name)
def make_fields(field_type, index):
if field_type.__name__ == 'bool':
fields = []
else:
fields = [ 'result' ]
if field_type.is_case_type():
fields.append('_')
fields.append('this')
if not field_type.unique_parent:
fields.append(str(index))
return ', '.join(fields)
def get_a(name):
name = capitalize_name(singularize(name))
if name[0] in 'AEIOU':
return 'getAn' + name
else:
return 'getA' + name
def indefinite_article(name):
name = capitalize_name(singularize(name))
if name[0] in 'AEIOU':
return 'an'
else:
return 'a'
def capitalize_name(name):
'Capitalize name, forming camel-case from undescores'
return ''.join(part.capitalize() for part in name.split('_'))
def name_to_query(name):
if name.startswith("is_"):
return "i" + capitalize_name(name)[1:]
else:
return "is" + capitalize_name(name)
def longer_name(node, name, docname):
return '%s of this %s' % (docname, node.descriptive_name)
def property_name(node, name, docname):
return '%s property of this %s' % (docname, node.descriptive_name)
def make_getter(node, name, offset, field_type, docname, override):
txt = [u'\n']
if field_type.__name__ == 'bool':
txt.append(u' /** Whether the %s is true. */\n' % property_name(node, name, docname))
txt.append(u' predicate %s() {\n' % name_to_query(name))
elif name == "location":
txt.append(u' /** Gets the %s. */\n' % longer_name(node, name, docname))
txt.append(u' %s%s get%s() {\n'%(override , field_type.ql_name(), capitalize_name(name)))
else:
txt.append(u' /** Gets the %s. */\n' % longer_name(node, name, docname))
txt.append(u' %s get%s() {\n'%(field_type.ql_name(), capitalize_name(name)))
if field_type.super_type:
field_type = field_type.super_type
fields = make_fields(field_type, offset)
txt.append(u' %s(%s)\n' % (field_type.relation_name(), fields))
txt.append(u' }\n\n')
if field_type.is_list():
item = field_type.item_type
lname = longer_name(node, singularize(name), singularize_text(docname))
txt.append('\n')
txt.append(' /** Gets the nth %s. */\n' % lname)
txt.append(' %s get%s(int index) {\n' %
(item.ql_name(), capitalize_name(singularize(name))))
txt.append(' result = this.get%s().getItem(index)\n' %
capitalize_name(name))
txt.append(' }\n')
txt.append('\n')
txt.append(' /** Gets %s %s. */\n' % (indefinite_article(lname), lname))
txt.append(' %s %s() {\n' % (item.ql_name(), get_a(name)))
txt.append(' result = this.get%s().getAnItem()\n' %
capitalize_name(name))
txt.append(' }\n\n')
return ''.join(txt)
def defined_in_supertype(node, name):
if node.super_type:
for fname, _, _, _, _, _ in node.super_type.layout:
if fname == name:
return True
return False
def write_queries(nodes, out, lang):
parents = {}
nodes = set(nodes)
done = set()
out.write('import %s\n\n' % lang)
while nodes:
#Emit in (mostly) sorted order to reduce diffs.
node = pop_least_value(nodes)
done.add(node)
if node.is_primitive():
continue
if node.is_list() and node.item_type.is_union_type():
#List of unions are best ignored.
#They can be implemented manually if needed.
continue
out.write('/** INTERNAL: See the class `%s` for further information. */\n' % node.ql_name())
out.write('class %s_ extends %s' %
(node.ql_name(), node.db_name()))
if node.super_type:
out.write(', %s' % node.super_type.ql_name())
override = "override " if node.super_type else ""
out.write(' {\n\n')
if node.is_sub_type() and node.super_type.is_union_type():
out.write(' %s() {\n' % node.ql_name())
out.write(' %s(this, %d, _, _' %
(node.super_type.relation_name(), node.case_index))
out.write(')\n')
out.write(' }\n\n')
else:
body = []
for name, field_type, offset, docname, _, _ in node.layout:
if defined_in_supertype(node, name):
continue
body.append(make_getter(node, name, offset, field_type, docname, override))
out.write(''.join(body))
if node.parents:
if node.super_type and node.super_type.is_case_type():
child_node = node.super_type
else:
child_node = node
#Ensure closure
if child_node.parents not in done:
nodes.add(child_node.parents)
if not override:
out.write(' /** Gets a parent of this %s */\n' % node.descriptive_name)
out.write(' %s%s getParent() {\n' %
(override, child_node.parents.ql_name()))
out.write(' %s(' % child_node.relation_name())
fields = [ 'this', ]
if child_node.is_case_type():
fields.append('_')
fields.append('result')
if not child_node.unique_parent:
fields.append('_')
out.write('%s)\n' % ', '.join(fields))
out.write(' }\n\n')
if child_node.parents.ql_name() not in parents:
parents[child_node.parents.ql_name()] = []
parents[child_node.parents.ql_name()].append(child_node)
if node.is_list():
fields = [ 'result']
item = node.item_type
if item.super_type and item.super_type.is_case_type():
item = item.super_type
if item.is_case_type():
fields.append('_')
fields.append('this')
fields = ', '.join(fields)
out.write(' /** Gets an item of this %s */\n' % node.descriptive_name)
out.write(' %s getAnItem() {\n' % item.ql_name())
out.write(' %s(%s, _)\n' %
(item.relation_name(), fields))
out.write(' }\n\n')
out.write(' /** Gets the nth item of this %s */\n' % node.descriptive_name)
out.write(' %s getItem(int index) {\n' % item.ql_name())
out.write(' %s(%s, index)\n' %
(item.relation_name(), fields))
out.write(' }\n\n')
if not override:
out.write(' /** Gets a textual representation of this element. */\n')
out.write(' %sstring toString() {\n' % override)
out.write(' result = "%s"\n' % node.ql_name())
out.write(' }\n')
out.write('\n}\n\n')
out.close()
def pop_least_value(nodes):
#This is inefficient, but it doesn't matter
res = min(nodes, key = lambda n: n.__name__)
nodes.remove(res)
return res
HEADER = '''/**
* This library file is auto-generated by '%s'.
* WARNING: Any modifications to this file will be lost.
* Relations can be changed by modifying master.py.
*/
'''
def main():
run(master)
def run(nodes_module, lang="python"):
if len(sys.argv) != 2:
print("Usage: %s output-directory" % sys.argv[0])
sys.exit(1)
outdir = sys.argv[1]
nodes = nodes_module.all_nodes()
outfile = os.path.join(outdir, 'AstGenerated.qll')
with open(outfile, 'w') as out:
out.write(HEADER % '/'.join(__file__.split(os.path.sep)[-2:]))
write_queries(nodes.values(), out, lang)
if __name__ == '__main__':
main()