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@@ -0,0 +1,565 @@
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+#-------------------------------------------------------------------------------
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+# Read output of gen_json.py and generate Zig language bindings.
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+#
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+# Nim coding style:
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+# - types and constants are PascalCase
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+# - functions, parameters, and fields are camelCase
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+#-------------------------------------------------------------------------------
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+import gen_ir
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+import json, re, os, shutil
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+
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+module_names = {
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+ 'sg_': 'gfx',
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+ 'sapp_': 'app',
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+ 'stm_': 'time',
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+ 'saudio_': 'audio',
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+ 'sgl_': 'gl',
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+ 'sdtx_': 'debugtext',
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+ 'sshape_': 'shape',
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+}
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+
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+c_source_paths = {
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+ 'sg_': 'sokol-zig/src/sokol/c/sokol_app_gfx.c',
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+ 'sapp_': 'sokol-zig/src/sokol/c/sokol_app_gfx.c',
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+ 'stm_': 'sokol-zig/src/sokol/c/sokol_time.c',
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+ 'saudio_': 'sokol-zig/src/sokol/c/sokol_audio.c',
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+ 'sgl_': 'sokol-zig/src/sokol/c/sokol_gl.c',
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+ 'sdtx_': 'sokol-zig/src/sokol/c/sokol_debugtext.c',
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+ 'sshape_': 'sokol-zig/src/sokol/c/sokol_shape.c',
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+}
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+
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+func_name_ignores = [
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+ 'sdtx_printf',
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+ 'sdtx_vprintf',
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+]
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+
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+func_name_overrides = {
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+ 'sgl_error': 'sgl_get_error', # 'error' is reserved in Zig
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+ 'sgl_deg': 'sgl_as_degrees',
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+ 'sgl_rad': 'sgl_as_radians',
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+}
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+
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+struct_field_type_overrides = {
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+ 'sg_context_desc.color_format': 'int',
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+ 'sg_context_desc.depth_format': 'int',
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+}
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+
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+prim_types = {
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+ 'int': 'int32',
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+ 'bool': 'bool',
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+ 'char': 'char',
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+ 'int8_t': 'int8',
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+ 'uint8_t': 'uint8',
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+ 'int16_t': 'int16',
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+ 'uint16_t': 'uint16',
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+ 'int32_t': 'int32',
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+ 'uint32_t': 'uint32',
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+ 'int64_t': 'int64',
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+ 'uint64_t': 'uint64',
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+ 'float': 'float32',
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+ 'double': 'float64',
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+ 'uintptr_t': 'uint',
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+ 'intptr_t': 'int',
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+ 'size_t': 'int',
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+}
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+
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+prim_defaults = {
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+ 'int': '0',
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+ 'bool': 'false',
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+ 'int8_t': '0',
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+ 'uint8_t': '0',
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+ 'int16_t': '0',
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+ 'uint16_t': '0',
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+ 'int32_t': '0',
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+ 'uint32_t': '0',
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+ 'int64_t': '0',
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+ 'uint64_t': '0',
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+ 'float': '0.0',
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+ 'double': '0.0',
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+ 'uintptr_t': '0',
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+ 'intptr_t': '0',
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+ 'size_t': '0'
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+}
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+
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+struct_types = []
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+enum_types = []
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+enum_items = {}
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+out_lines = ''
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+
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+def reset_globals():
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+ global struct_types
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+ global enum_types
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+ global enum_items
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+ global out_lines
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+ struct_types = []
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+ enum_types = []
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+ enum_items = {}
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+ out_lines = ''
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+
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+re_1d_array = re.compile("^(?:const )?\w*\s\*?\[\d*\]$")
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+re_2d_array = re.compile("^(?:const )?\w*\s\*?\[\d*\]\[\d*\]$")
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+
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+def l(s):
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+ global out_lines
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+ out_lines += s + '\n'
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+
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+def as_nim_prim_type(s):
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+ return prim_types[s]
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+
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+# prefix_bla_blub(_t) => (dep.)BlaBlub
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+def as_nim_struct_type(s, prefix):
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+ parts = s.lower().split('_')
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+ outp = '' if s.startswith(prefix) else f'{parts[0]}.'
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+ for part in parts[1:]:
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+ if (part != 't'):
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+ outp += part.capitalize()
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+ return outp
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+
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+# prefix_bla_blub(_t) => (dep.)BlaBlub
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+def as_nim_enum_type(s, prefix):
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+ parts = s.lower().split('_')
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+ outp = '' if s.startswith(prefix) else f'{parts[0]}.'
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+ for part in parts[1:]:
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+ if (part != 't'):
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+ outp += part.capitalize()
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+ return outp
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+
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+# prefix_bla_blub(_t) => (dep.)BlaBlub
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+def as_nim_const_type(s, prefix):
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+ parts = s.lower().split('_')
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+ outp = '' if s.startswith(prefix) else f'{parts[0]}.'
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+ for part in parts[1:]:
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+ if (part != 't'):
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+ outp += part.capitalize()
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+ return outp
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+
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+def check_struct_field_type_override(struct_name, field_name, orig_type):
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+ s = f"{struct_name}.{field_name}"
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+ if s in struct_field_type_overrides:
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+ return struct_field_type_overrides[s]
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+ else:
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+ return orig_type
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+
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+def check_func_name_ignore(func_name):
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+ return func_name in func_name_ignores
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+
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+def check_func_name_override(func_name):
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+ if func_name in func_name_overrides:
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+ return func_name_overrides[func_name]
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+ else:
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+ return func_name
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+
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+def trim_prefix(s, prefix):
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+ outp = s;
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+ if outp.lower().startswith(prefix.lower()):
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+ outp = outp[len(prefix):]
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+ return outp
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+
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+# PREFIX_BLA_BLUB to bla_blub
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+def as_snake_case(s, prefix = ""):
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+ return trim_prefix(s, prefix).lower()
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+
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+# prefix_bla_blub => blaBlub
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+def as_camel_case(s, prefix = ""):
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+ parts = trim_prefix(s, prefix).lower().split('_')
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+ outp = parts[0]
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+ for part in parts[1:]:
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+ outp += part.capitalize()
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+ return outp
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+
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+# prefix_bla_blub => BlaBlub
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+def as_pascal_case(s, prefix):
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+ parts = trim_prefix(s, prefix).lower().split('_')
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+ outp = ""
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+ for part in parts:
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+ outp += part.capitalize()
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+ return outp
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+
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+# PREFIX_ENUM_BLA => Bla, _PREFIX_ENUM_BLA => Bla
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+def as_enum_item_name(s):
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+ outp = s
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+ if outp.startswith('_'):
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+ outp = outp[1:]
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+ parts = outp.lower().split('_')[2:]
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+ outp = ""
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+ for part in parts:
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+ outp += part.capitalize()
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+ if outp[0].isdigit():
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+ outp = 'N' + outp
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+ return outp
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+
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+def enum_default_item(enum_name):
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+ return enum_items[enum_name][0]
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+
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+def is_prim_type(s):
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+ return s in prim_types
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+
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+def is_struct_type(s):
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+ return s in struct_types
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+
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+def is_enum_type(s):
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+ return s in enum_types
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+
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+def is_string_ptr(s):
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+ return s == "const char *"
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+
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+def is_const_void_ptr(s):
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+ return s == "const void *"
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+
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+def is_void_ptr(s):
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+ return s == "void *"
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+
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+def is_const_prim_ptr(s):
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+ for prim_type in prim_types:
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+ if s == f"const {prim_type} *":
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+ return True
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+ return False
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+
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+def is_prim_ptr(s):
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+ for prim_type in prim_types:
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+ if s == f"{prim_type} *":
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+ return True
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+ return False
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+
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+def is_const_struct_ptr(s):
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+ for struct_type in struct_types:
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+ if s == f"const {struct_type} *":
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+ return True
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+ return False
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+
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+def is_func_ptr(s):
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+ return '(*)' in s
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+
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+def is_1d_array_type(s):
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+ return re_1d_array.match(s)
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+
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+def is_2d_array_type(s):
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+ return re_2d_array.match(s)
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+
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+def type_default_value(s):
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+ return prim_defaults[s]
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+
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+def extract_array_type(s):
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+ return s[:s.index('[')].strip()
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+
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+def extract_array_nums(s):
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+ return s[s.index('['):].replace('[', ' ').replace(']', ' ').split()
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+
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+def extract_ptr_type(s):
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+ tokens = s.split()
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+ if tokens[0] == 'const':
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+ return tokens[1]
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+ else:
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+ return tokens[0]
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+
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+def as_extern_c_arg_type(arg_type, prefix):
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+ if arg_type == "void":
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+ return "void"
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+ elif is_prim_type(arg_type):
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+ return as_nim_prim_type(arg_type)
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+ elif is_struct_type(arg_type):
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+ return as_nim_struct_type(arg_type, prefix)
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+ elif is_enum_type(arg_type):
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+ return as_nim_enum_type(arg_type, prefix)
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+ elif is_void_ptr(arg_type):
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+ return "pointer"
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+ elif is_const_void_ptr(arg_type):
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+ return "pointer"
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+ elif is_string_ptr(arg_type):
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+ return "ptr uint8"
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+ elif is_const_struct_ptr(arg_type):
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+ return f"ptr {as_nim_struct_type(extract_ptr_type(arg_type), prefix)}"
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+ elif is_prim_ptr(arg_type):
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+ return f"[*c] {as_nim_prim_type(extract_ptr_type(arg_type))}"
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+ elif is_const_prim_ptr(arg_type):
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+ return f"ptr {as_nim_prim_type(extract_ptr_type(arg_type))}"
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+ else:
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+ return '??? (as_extern_c_arg_type)'
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+
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+def as_nim_arg_type(arg_prefix, arg_type, prefix):
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+ # NOTE: if arg_prefix is None, the result is used as return value
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+ pre = "" if arg_prefix is None else arg_prefix
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+ if arg_type == "void":
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+ if arg_prefix is None:
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+ return "void"
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+ else:
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+ return ""
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+ elif is_prim_type(arg_type):
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+ return pre + as_nim_prim_type(arg_type)
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+ elif is_struct_type(arg_type):
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+ return pre + as_nim_struct_type(arg_type, prefix)
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+ elif is_enum_type(arg_type):
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+ return pre + as_nim_enum_type(arg_type, prefix)
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+ elif is_void_ptr(arg_type):
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+ return pre + "pointer"
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+ elif is_const_void_ptr(arg_type):
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+ return pre + "pointer"
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+ elif is_string_ptr(arg_type):
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+ return pre + "cstring"
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+ elif is_const_struct_ptr(arg_type):
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+ return pre + f"ptr {as_nim_struct_type(extract_ptr_type(arg_type), prefix)}"
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+ elif is_prim_ptr(arg_type):
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+ return pre + f"ptr {as_nim_prim_type(extract_ptr_type(arg_type))}"
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+ elif is_const_prim_ptr(arg_type):
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+ return pre + f"ptr {as_nim_prim_type(extract_ptr_type(arg_type))}"
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+ else:
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+ return arg_prefix + "??? (as_nim_arg_type)"
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+
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+# get C-style arguments of a function pointer as string
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+def funcptr_args_c(field_type, prefix):
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+ tokens = field_type[field_type.index('(*)')+4:-1].split(',')
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+ s = ""
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+ n = 0
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+ for token in tokens:
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+ n += 1
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+ arg_type = token.strip()
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+ if s != "":
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+ s += ", "
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+ c_arg = f"a{n}:" + as_extern_c_arg_type(arg_type, prefix)
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+ if (c_arg == "void"):
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+ return ""
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+ else:
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+ s += c_arg
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+ if s == "a1:void":
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+ s = ""
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+ return s
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+
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+# get C-style result of a function pointer as string
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+def funcptr_res_c(field_type):
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+ res_type = field_type[:field_type.index('(*)')].strip()
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+ if res_type == 'void':
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+ return ''
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+ elif is_const_void_ptr(res_type):
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+ return ':pointer'
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+ else:
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+ return '???'
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+
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+def funcdecl_args_c(decl, prefix):
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+ s = ""
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+ for param_decl in decl['params']:
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+ if s != "":
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+ s += ", "
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+ arg_type = param_decl['type']
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+ s += as_extern_c_arg_type(arg_type, prefix)
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+ return s
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+
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+def funcdecl_args_nim(decl, prefix):
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+ s = ""
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+ for param_decl in decl['params']:
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+ if s != "":
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+ s += ", "
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+ arg_name = param_decl['name']
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+ arg_type = param_decl['type']
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+ s += f"{as_nim_arg_type(f'{arg_name}:', arg_type, prefix)}"
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+ return s
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+
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+def funcdecl_res_c(decl, prefix):
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+ decl_type = decl['type']
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+ res_type = decl_type[:decl_type.index('(')].strip()
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+ return as_extern_c_arg_type(res_type, prefix)
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+
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+def funcdecl_res_nim(decl, prefix):
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+ decl_type = decl['type']
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+ res_type = decl_type[:decl_type.index('(')].strip()
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+ nim_res_type = as_nim_arg_type(None, res_type, prefix)
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+ if nim_res_type == "":
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+ nim_res_type = "void"
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+ return nim_res_type
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+
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+def gen_struct(decl, prefix, use_raw_name=False):
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+ struct_name = decl['name']
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+ nim_type = struct_name if use_raw_name else as_nim_struct_type(struct_name, prefix)
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+ l(f"type {nim_type}* = object")
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+ isPublic = True
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+ for field in decl['fields']:
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+ field_name = field['name']
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+ if field_name == "__pad":
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+ # FIXME: these should be guarded by SOKOL_ZIG_BINDINGS, but aren't?
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+ continue
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+ isPublic = not field_name.startswith("_")
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+ field_name = as_camel_case(field_name, "_")
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+ if field_name == "ptr":
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+ field_name = "source"
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+ if field_name == "ref":
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+ field_name = "`ref`"
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+ if field_name == "type":
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+ field_name = "`type`"
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+ if isPublic:
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+ field_name += "*"
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+ field_type = field['type']
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+ field_type = check_struct_field_type_override(struct_name, field_name, field_type)
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+ if is_prim_type(field_type):
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+ l(f" {field_name}:{as_nim_prim_type(field_type)}")
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+ elif is_struct_type(field_type):
|
|
|
+ l(f" {field_name}:{as_nim_struct_type(field_type, prefix)}")
|
|
|
+ elif is_enum_type(field_type):
|
|
|
+ l(f" {field_name}:{as_nim_enum_type(field_type, prefix)}")
|
|
|
+ elif is_string_ptr(field_type):
|
|
|
+ l(f" {field_name}:cstring")
|
|
|
+ elif is_const_void_ptr(field_type):
|
|
|
+ l(f" {field_name}:pointer")
|
|
|
+ elif is_void_ptr(field_type):
|
|
|
+ l(f" {field_name}:pointer")
|
|
|
+ elif is_const_prim_ptr(field_type):
|
|
|
+ l(f" {field_name}:ptr {as_nim_prim_type(extract_ptr_type(field_type))}")
|
|
|
+ elif is_func_ptr(field_type):
|
|
|
+ l(f" {field_name}:proc({funcptr_args_c(field_type, prefix)}){funcptr_res_c(field_type)} {{.cdecl.}}")
|
|
|
+ elif is_1d_array_type(field_type):
|
|
|
+ array_type = extract_array_type(field_type)
|
|
|
+ array_nums = extract_array_nums(field_type)
|
|
|
+ if is_prim_type(array_type) or is_struct_type(array_type):
|
|
|
+ if is_prim_type(array_type):
|
|
|
+ nim_type = as_nim_prim_type(array_type)
|
|
|
+ elif is_struct_type(array_type):
|
|
|
+ nim_type = as_nim_struct_type(array_type, prefix)
|
|
|
+ elif is_enum_type(array_type):
|
|
|
+ nim_type = as_nim_enum_type(array_type, prefix)
|
|
|
+ else:
|
|
|
+ nim_type = '??? (array type)'
|
|
|
+ t0 = f"array[{array_nums[0]}, {nim_type}]"
|
|
|
+ t0_slice = f"[]const {nim_type}"
|
|
|
+ t1 = f"[_]{nim_type}"
|
|
|
+ l(f" {field_name}:{t0}")
|
|
|
+ elif is_const_void_ptr(array_type):
|
|
|
+ l(f" {field_name}:array[{array_nums[0]}, pointer]")
|
|
|
+ else:
|
|
|
+ l(f"// FIXME: ??? array {field_name}:{field_type} => {array_type} [{array_nums[0]}]")
|
|
|
+ elif is_2d_array_type(field_type):
|
|
|
+ array_type = extract_array_type(field_type)
|
|
|
+ array_nums = extract_array_nums(field_type)
|
|
|
+ if is_prim_type(array_type):
|
|
|
+ nim_type = as_nim_prim_type(array_type)
|
|
|
+ def_val = type_default_value(array_type)
|
|
|
+ elif is_struct_type(array_type):
|
|
|
+ nim_type = as_nim_struct_type(array_type, prefix)
|
|
|
+ def_val = ".{ }"
|
|
|
+ else:
|
|
|
+ nim_type = "???"
|
|
|
+ def_val = "???"
|
|
|
+ t0 = f"array[{array_nums[0]}, array[{array_nums[1]}, {nim_type}]]"
|
|
|
+ l(f" {field_name}:{t0}")
|
|
|
+ else:
|
|
|
+ l(f"// FIXME: {field_name}:{field_type};")
|
|
|
+ l("")
|
|
|
+
|
|
|
+def gen_consts(decl, prefix):
|
|
|
+ l("const")
|
|
|
+ for item in decl['items']:
|
|
|
+ l(f" {trim_prefix(item['name'], prefix)}* = {item['value']}")
|
|
|
+ l("")
|
|
|
+
|
|
|
+def gen_enum(decl, prefix):
|
|
|
+ item_names_by_value = {}
|
|
|
+ value = -1
|
|
|
+ hasForceU32 = False
|
|
|
+ hasExplicitValues = False
|
|
|
+ for item in decl['items']:
|
|
|
+ if item['name'].endswith("_FORCE_U32"):
|
|
|
+ hasForceU32 = True
|
|
|
+ else:
|
|
|
+ if 'value' in item:
|
|
|
+ hasExplicitValues = True
|
|
|
+ value = int(item['value'])
|
|
|
+ else:
|
|
|
+ value += 1
|
|
|
+ item_names_by_value[value] = as_enum_item_name(item['name']);
|
|
|
+ if hasForceU32:
|
|
|
+ l(f"type {as_nim_enum_type(decl['name'], prefix)}* {{.pure, size:4.}} = enum")
|
|
|
+ else:
|
|
|
+ l(f"type {as_nim_enum_type(decl['name'], prefix)}* {{.pure.}} = enum")
|
|
|
+ if hasExplicitValues:
|
|
|
+ # Nim requires explicit enum values to be declared in ascending order
|
|
|
+ for value in sorted(item_names_by_value):
|
|
|
+ name = item_names_by_value[value]
|
|
|
+ l(f" {name} = {value},")
|
|
|
+ else:
|
|
|
+ for name in item_names_by_value.values():
|
|
|
+ l(f" {name},")
|
|
|
+ l("")
|
|
|
+
|
|
|
+def gen_func_nim(decl, prefix):
|
|
|
+ c_func_name = decl['name']
|
|
|
+ nim_func_name = as_camel_case(decl['name'], prefix)
|
|
|
+ nim_res_type = funcdecl_res_nim(decl, prefix)
|
|
|
+ l(f"proc {nim_func_name}*({funcdecl_args_nim(decl, prefix)}):{funcdecl_res_nim(decl, prefix)} {{.cdecl, importc:\"{decl['name']}\".}}")
|
|
|
+ l("")
|
|
|
+
|
|
|
+def pre_parse(inp):
|
|
|
+ global struct_types
|
|
|
+ global enum_types
|
|
|
+ for decl in inp['decls']:
|
|
|
+ kind = decl['kind']
|
|
|
+ if kind == 'struct':
|
|
|
+ struct_types.append(decl['name'])
|
|
|
+ elif kind == 'enum':
|
|
|
+ enum_name = decl['name']
|
|
|
+ enum_types.append(enum_name)
|
|
|
+ enum_items[enum_name] = []
|
|
|
+ for item in decl['items']:
|
|
|
+ enum_items[enum_name].append(as_enum_item_name(item['name']))
|
|
|
+
|
|
|
+def gen_imports(inp, dep_prefixes):
|
|
|
+ for dep_prefix in dep_prefixes:
|
|
|
+ dep_module_name = module_names[dep_prefix]
|
|
|
+ l(f'import {dep_module_name}')
|
|
|
+ l('')
|
|
|
+
|
|
|
+def gen_module(inp, dep_prefixes):
|
|
|
+ l('## machine generated, do not edit')
|
|
|
+ l('')
|
|
|
+ gen_imports(inp, dep_prefixes)
|
|
|
+ pre_parse(inp)
|
|
|
+ prefix = inp['prefix']
|
|
|
+ for decl in inp['decls']:
|
|
|
+ if not decl['is_dep']:
|
|
|
+ kind = decl['kind']
|
|
|
+ if kind == 'consts':
|
|
|
+ gen_consts(decl, prefix)
|
|
|
+ elif kind == 'enum':
|
|
|
+ gen_enum(decl, prefix)
|
|
|
+ elif kind == 'struct':
|
|
|
+ gen_struct(decl, prefix)
|
|
|
+ elif kind == 'func':
|
|
|
+ if not check_func_name_ignore(decl['name']):
|
|
|
+ gen_func_nim(decl, prefix)
|
|
|
+
|
|
|
+def prepare():
|
|
|
+ print('Generating nim bindings:')
|
|
|
+ if not os.path.isdir('sokol-nim/src/sokol'):
|
|
|
+ os.makedirs('sokol-nim/src/sokol')
|
|
|
+ if not os.path.isdir('sokol-nim/src/sokol/c'):
|
|
|
+ os.makedirs('sokol-nim/src/sokol/c')
|
|
|
+
|
|
|
+def gen(c_header_path, c_prefix, dep_c_prefixes):
|
|
|
+ global out_lines
|
|
|
+ module_name = module_names[c_prefix]
|
|
|
+ c_source_path = c_source_paths[c_prefix]
|
|
|
+ print(f' {c_header_path} => {module_name}')
|
|
|
+ reset_globals()
|
|
|
+ shutil.copyfile(c_header_path, f'sokol-nim/src/sokol/c/{os.path.basename(c_header_path)}')
|
|
|
+ ir = gen_ir.gen(c_header_path, c_source_path, module_name, c_prefix, dep_c_prefixes)
|
|
|
+ gen_module(ir, dep_c_prefixes)
|
|
|
+ output_path = f"sokol-nim/src/sokol/{ir['module']}.nim"
|
|
|
+
|
|
|
+ ## some changes for readability
|
|
|
+ out_lines = out_lines.replace("PixelformatInfo", "PixelFormatInfo")
|
|
|
+ out_lines = out_lines.replace(" Dontcare,", " DontCare,")
|
|
|
+ out_lines = out_lines.replace(" Vertexbuffer,", " VertexBuffer,")
|
|
|
+ out_lines = out_lines.replace(" Indexbuffer,", " IndexBuffer,")
|
|
|
+ out_lines = out_lines.replace(" N2d,", " Plane,")
|
|
|
+ out_lines = out_lines.replace(" N3d,", " Volume,")
|
|
|
+ out_lines = out_lines.replace(" Vs,", " Vertex,")
|
|
|
+ out_lines = out_lines.replace(" Fs,", " Fragment,")
|
|
|
+
|
|
|
+ ## include extensions in generated code
|
|
|
+ l("# Nim-specific API extensions")
|
|
|
+ l(f"include ext/{ir['module']}")
|
|
|
+
|
|
|
+ ## copy extensions into generated code
|
|
|
+ # ext_path = f"sokol-nim/src/sokol/ext/{ir['module']}.nim"
|
|
|
+ # if os.path.isfile(ext_path):
|
|
|
+ # with open(ext_path, 'r') as f_ext:
|
|
|
+ # out_lines += f_ext.read()
|
|
|
+
|
|
|
+ with open(output_path, 'w', newline='\n') as f_outp:
|
|
|
+ f_outp.write(out_lines)
|
Garett Bass