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Diffstat (limited to 'tools/go_generics/defs.bzl')
-rw-r--r-- | tools/go_generics/defs.bzl | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/tools/go_generics/defs.bzl b/tools/go_generics/defs.bzl deleted file mode 100644 index ad97208a8..000000000 --- a/tools/go_generics/defs.bzl +++ /dev/null @@ -1,127 +0,0 @@ -"""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")), - }, -) |