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-def _go_template_impl(ctx):
- input = ctx.files.srcs
- output = ctx.outputs.out
-
- args = ["-o=%s" % output.path] + [f.path for f in input]
-
- ctx.actions.run(
- inputs = input,
- outputs = [output],
- mnemonic = "GoGenericsTemplate",
- progress_message = "Building Go template %s" % ctx.label,
- arguments = args,
- executable = ctx.executable._tool,
- )
-
- return struct(
- types = ctx.attr.types,
- opt_types = ctx.attr.opt_types,
- consts = ctx.attr.consts,
- opt_consts = ctx.attr.opt_consts,
- deps = ctx.attr.deps,
- file = output,
- )
-
-"""
-Generates a Go template from a set of Go files.
-
-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.
-
-Args:
- name: the name of the template.
- srcs: the list of source files that comprise the template.
- types: the list of generic types in the template that are required to be specified.
- opt_types: the list of generic types in the template that can but aren't required to be specified.
- consts: the list of constants in the template that are required to be specified.
- opt_consts: the list of constants in the template that can but aren't required to be specified.
- deps: the list of dependencies.
-"""
-go_template = rule(
- implementation = _go_template_impl,
- attrs = {
- "srcs": attr.label_list(mandatory = True, allow_files = True),
- "deps": attr.label_list(allow_files = True),
- "types": attr.string_list(),
- "opt_types": attr.string_list(),
- "consts": attr.string_list(),
- "opt_consts": attr.string_list(),
- "_tool": attr.label(executable = True, cfg = "host", default = Label("//tools/go_generics/go_merge")),
- },
- outputs = {
- "out": "%{name}_template.go",
- },
-)
-
-def _go_template_instance_impl(ctx):
- template = ctx.attr.template
- output = ctx.outputs.out
-
- # Check that all required types are defined.
- for t in template.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 template.types) and (t not in template.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 template.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 template.consts) and (t not in template.opt_consts):
- fail("Const %s it not a parameter to %s" % (t, ctx.attr.template.label))
-
- # Build the argument list.
- args = ["-i=%s" % template.file.path, "-o=%s" % output.path]
- args += ["-p=%s" % ctx.attr.package]
-
- if len(ctx.attr.prefix) > 0:
- args += ["-prefix=%s" % ctx.attr.prefix]
-
- if len(ctx.attr.suffix) > 0:
- args += ["-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 += ["-anon"]
-
- ctx.actions.run(
- inputs = [template.file],
- outputs = [output],
- mnemonic = "GoGenericsInstance",
- progress_message = "Building Go template instance %s" % ctx.label,
- arguments = args,
- executable = ctx.executable._tool,
- )
-
- # TODO: How can we get the dependencies out?
- return struct(
- files = depset([output]),
- )
-
-"""
-Instantiates a Go template by replacing all generic types with concrete ones.
-
-Args:
- name: the name of the template instance.
- template: the label of the template to be instatiated.
- prefix: a prefix to be added to globals in the template.
- suffix: a suffix to be added to global in the template.
- types: the map from generic type names to concrete ones.
- consts: the map from constant names to their values.
- imports: the map from imports used in types/consts to their import paths.
- package: the name of the package the instantiated template will be compiled into.
-"""
-go_template_instance = rule(
- implementation = _go_template_instance_impl,
- attrs = {
- "template": attr.label(mandatory = True, providers = ["types"]),
- "prefix": attr.string(),
- "suffix": attr.string(),
- "types": attr.string_dict(),
- "consts": attr.string_dict(),
- "imports": attr.string_dict(),
- "anon": attr.bool(mandatory = False, default = False),
- "package": attr.string(mandatory = True),
- "out": attr.output(mandatory = True),
- "_tool": attr.label(executable = True, cfg = "host", default = Label("//tools/go_generics")),
- },
-)