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-"""Generics support via go_generics.
-
-A Go template is similar to a go library, except that it has certain types that
-can be replaced before usage. For example, one could define a templatized List
-struct, whose elements are of type T, then instantiate that template for
-T=segment, where "segment" is the concrete type.
-"""
-
-TemplateInfo = provider(
- "Information about a go_generics template.",
- fields = {
- "unsafe": "whether the template requires unsafe code",
- "types": "required types",
- "opt_types": "optional types",
- "consts": "required consts",
- "opt_consts": "optional consts",
- "deps": "package dependencies",
- "template": "merged template source file",
- },
-)
-
-def _go_template_impl(ctx):
- srcs = ctx.files.srcs
- template = ctx.actions.declare_file(ctx.label.name + "_template.go")
- args = ["-o=%s" % template.path] + [f.path for f in srcs]
-
- ctx.actions.run(
- inputs = srcs,
- outputs = [template],
- mnemonic = "GoGenericsTemplate",
- progress_message = "Building Go template %s" % ctx.label,
- arguments = args,
- executable = ctx.executable._tool,
- )
-
- return [TemplateInfo(
- types = ctx.attr.types,
- opt_types = ctx.attr.opt_types,
- consts = ctx.attr.consts,
- opt_consts = ctx.attr.opt_consts,
- deps = ctx.attr.deps,
- template = template,
- )]
-
-go_template = rule(
- implementation = _go_template_impl,
- attrs = {
- "srcs": attr.label_list(doc = "the list of source files that comprise the template", mandatory = True, allow_files = True),
- "deps": attr.label_list(doc = "the standard dependency list", allow_files = True, cfg = "target"),
- "types": attr.string_list(doc = "the list of generic types in the template that are required to be specified"),
- "opt_types": attr.string_list(doc = "the list of generic types in the template that can but aren't required to be specified"),
- "consts": attr.string_list(doc = "the list of constants in the template that are required to be specified"),
- "opt_consts": attr.string_list(doc = "the list of constants in the template that can but aren't required to be specified"),
- "_tool": attr.label(executable = True, cfg = "host", default = Label("//tools/go_generics/go_merge")),
- },
-)
-
-def _go_template_instance_impl(ctx):
- info = ctx.attr.template[TemplateInfo]
- output = ctx.outputs.out
-
- # Check that all required types are defined.
- for t in info.types:
- if t not in ctx.attr.types:
- fail("Missing value for type %s in %s" % (t, ctx.attr.template.label))
-
- # Check that all defined types are expected by the template.
- for t in ctx.attr.types:
- if (t not in info.types) and (t not in info.opt_types):
- fail("Type %s it not a parameter to %s" % (t, ctx.attr.template.label))
-
- # Check that all required consts are defined.
- for t in info.consts:
- if t not in ctx.attr.consts:
- fail("Missing value for constant %s in %s" % (t, ctx.attr.template.label))
-
- # Check that all defined consts are expected by the template.
- for t in ctx.attr.consts:
- if (t not in info.consts) and (t not in info.opt_consts):
- fail("Const %s it not a parameter to %s" % (t, ctx.attr.template.label))
-
- # Build the argument list.
- args = ["-i=%s" % info.template.path, "-o=%s" % output.path]
- if ctx.attr.package:
- args.append("-p=%s" % ctx.attr.package)
-
- if len(ctx.attr.prefix) > 0:
- args.append("-prefix=%s" % ctx.attr.prefix)
-
- if len(ctx.attr.suffix) > 0:
- args.append("-suffix=%s" % ctx.attr.suffix)
-
- args += [("-t=%s=%s" % (p[0], p[1])) for p in ctx.attr.types.items()]
- args += [("-c=%s=%s" % (p[0], p[1])) for p in ctx.attr.consts.items()]
- args += [("-import=%s=%s" % (p[0], p[1])) for p in ctx.attr.imports.items()]
-
- if ctx.attr.anon:
- args.append("-anon")
-
- ctx.actions.run(
- inputs = [info.template],
- outputs = [output],
- mnemonic = "GoGenericsInstance",
- progress_message = "Building Go template instance %s" % ctx.label,
- arguments = args,
- executable = ctx.executable._tool,
- )
-
- return [DefaultInfo(
- files = depset([output]),
- )]
-
-go_template_instance = rule(
- implementation = _go_template_instance_impl,
- attrs = {
- "template": attr.label(doc = "the label of the template to be instantiated", mandatory = True),
- "prefix": attr.string(doc = "a prefix to be added to globals in the template"),
- "suffix": attr.string(doc = "a suffix to be added to globals in the template"),
- "types": attr.string_dict(doc = "the map from generic type names to concrete ones"),
- "consts": attr.string_dict(doc = "the map from constant names to their values"),
- "imports": attr.string_dict(doc = "the map from imports used in types/consts to their import paths"),
- "anon": attr.bool(doc = "whether anoymous fields should be processed", mandatory = False, default = False),
- "package": attr.string(doc = "the package for the generated source file", mandatory = False),
- "out": attr.output(doc = "output file", mandatory = True),
- "_tool": attr.label(executable = True, cfg = "host", default = Label("//tools/go_generics")),
- },
-)