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"""

C++ trap class generation

`generate(opts, renderer)` will generate `TrapClasses.h` out of a `yml` schema file.

Each class in the schema gets a corresponding `struct` in `TrapClasses.h`, where:

* inheritance is preserved

* each property will be a corresponding field in the `struct` (with repeated properties mapping to `std::vector` and

optional ones to `std::optional`)

* final classes get a streaming operator that serializes the whole class into the corresponding trap emissions (using

`TrapEntries.h` from `trapgen`).

"""

import functools

import typing

import inflection

from misc.codegen.lib import cpp, schema

from misc.codegen.loaders import schemaloader

def _get_type(t: str, add_or_none_except: typing.Optional[str] = None) -> str:

if t is None:

# this is a predicate

return "bool"

if t == "string":

return "std::string"

if t == "boolean":

return "bool"

if t[0].isupper():

if add_or_none_except is not None and t != add_or_none_except:

suffix = "OrNone"

else:

suffix = ""

return f"TrapLabel<{t}{suffix}Tag>"

return t

def _get_trap_name(cls: schema.Class, p: schema.Property) -> str | None:

if p.is_single:

return None

overridden_trap_name = p.pragmas.get("ql_db_table_name")

if overridden_trap_name:

return inflection.camelize(overridden_trap_name)

trap_name = inflection.camelize(f"{cls.name}_{p.name}")

if p.is_predicate:

return trap_name

return inflection.pluralize(trap_name)

def _get_field(

cls: schema.Class,

p: schema.Property,

add_or_none_except: typing.Optional[str] = None,

) -> cpp.Field:

args = dict(

field_name=p.name + ("_" if p.name in cpp.cpp_keywords else ""),

base_type=_get_type(p.type, add_or_none_except),

is_optional=p.is_optional,

is_repeated=p.is_repeated,

is_predicate=p.is_predicate,

is_unordered=p.is_unordered,

trap_name=_get_trap_name(cls, p),

)

args.update(cpp.get_field_override(p.name))

return cpp.Field(**args)

class Processor:

def __init__(self, data: schema.Schema):

self._classmap = data.classes

if data.null:

root_type = next(iter(data.classes))

self._add_or_none_except = root_type

else:

self._add_or_none_except = None

@functools.lru_cache(maxsize=None)

def _get_class(self, name: str) -> cpp.Class:

cls = self._classmap[name]

trap_name = None

if not cls.derived or any(p.is_single for p in cls.properties):

trap_name = inflection.pluralize(cls.name)

return cpp.Class(

name=name,

bases=[self._get_class(b) for b in cls.bases],

fields=[

_get_field(cls, p, self._add_or_none_except)

for p in cls.properties

if "cpp_skip" not in p.pragmas and not p.synth

final=not cls.derived,

trap_name=trap_name,

)

def get_classes(self):

ret = {"": []}

for k, cls in self._classmap.items():

if not cls.synth:

ret.setdefault(cls.group, []).append(self._get_class(cls.name))

return ret

def generate(opts, renderer):

assert opts.cpp_output

processor = Processor(schemaloader.load_file(opts.schema))

out = opts.cpp_output

for dir, classes in processor.get_classes().items():

renderer.render(

cpp.ClassList(

classes,

opts.schema,

include_parent=bool(dir),

trap_library=opts.trap_library,

out / dir / "TrapClasses",

)

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