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5f923cd | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | // Copyright 2025 The ODML Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "runtime/components/prompt_template.h"
#include <string>
#include <utility>
#include "absl/status/status.h" // from @com_google_absl
#include "absl/status/statusor.h" // from @com_google_absl
#include "absl/strings/str_cat.h" // from @com_google_absl
#include "absl/strings/string_view.h" // from @com_google_absl
#include "absl/time/time.h" // from @com_google_absl
#include "nlohmann/json.hpp" // from @nlohmann_json
#include "runtime/components/rust/minijinja_template.rs.h"
#include "re2/re2.h" // from @com_googlesource_code_re2
namespace litert::lm {
namespace {
// Post-process the template to make it compatible with Minijinja.
//
// Minijinja is a Rust implementation of Jinja2, but it is not 100% compatible
// with the Python implementation. In particular, it does not support calling
// arbitrary Python methods on objects (e.g. `s.startswith("foo")`).
//
// This function uses regexes to rewrite common Python idioms found in
// tokenizer_config.json templates into Minijinja-compatible syntax.
std::string EditTemplateForMinijinja(absl::string_view template_content) {
std::string modified_template = std::string(template_content);
RE2::GlobalReplace(&modified_template, R"regex(\.startswith\((.*?)\))regex",
R"( is startingwith \1)");
RE2::GlobalReplace(&modified_template, R"regex(\.endswith\((.*?)\))regex",
R"( is endingwith \1)");
RE2::GlobalReplace(&modified_template,
R"regex(\.replace\((.*?),(.*?)\))regex",
R"( | replace(\1,\2))");
RE2::GlobalReplace(&modified_template, R"regex(\.split\((.*?)\)\[0\])regex",
R"( | split(\1) | first)");
RE2::GlobalReplace(&modified_template, R"regex(\.split\((.*?)\)\[-1\])regex",
R"( | split(\1) | last)");
RE2::GlobalReplace(&modified_template, R"regex(\.split\((.*?)\))regex",
R"( | split(\1))");
RE2::GlobalReplace(&modified_template, R"regex(\.join\((.*?)\))regex",
R"( | join(\1))");
RE2::GlobalReplace(&modified_template, R"regex(\.[l,r]strip\(\))regex",
" | trim");
RE2::GlobalReplace(&modified_template, R"regex(\.[l,r]strip\((.*?)\))regex",
R"( | trim(\1))");
RE2::GlobalReplace(&modified_template, R"regex(\.items\(\))regex",
" | items");
RE2::GlobalReplace(&modified_template, R"regex({% generation %})regex", "");
RE2::GlobalReplace(&modified_template, R"regex({% endgeneration %})regex",
"");
return modified_template;
}
} // namespace
using json = nlohmann::ordered_json;
PromptTemplate::PromptTemplate(absl::string_view template_content,
bool edit_template_for_minijinja)
: minijinja_template_(new_minijinja_template(
edit_template_for_minijinja
? EditTemplateForMinijinja(template_content)
: std::string(template_content))) {
const auto caps = minijinja_template_->get_capabilities();
capabilities_ = PromptTemplateCapabilities{
.supports_tools = caps.supports_tools,
.supports_tool_calls = caps.supports_tool_calls,
.supports_system_role = caps.supports_system_role,
.supports_parallel_tool_calls = caps.supports_parallel_tool_calls,
.supports_tool_call_id = caps.supports_tool_call_id,
.requires_typed_content = caps.requires_typed_content,
.supports_single_turn = caps.supports_single_turn};
}
PromptTemplate::PromptTemplate(const PromptTemplate& other)
: minijinja_template_(other.minijinja_template_->clone_template()) {
capabilities_ = other.capabilities_;
}
PromptTemplate& PromptTemplate::operator=(const PromptTemplate& other) {
minijinja_template_ = other.minijinja_template_->clone_template();
capabilities_ = other.capabilities_;
return *this;
}
PromptTemplate::PromptTemplate(PromptTemplate&& other)
: minijinja_template_(std::move(other.minijinja_template_)) {
capabilities_ = other.capabilities_;
}
PromptTemplate& PromptTemplate::operator=(PromptTemplate&& other) {
minijinja_template_ = std::move(other.minijinja_template_);
capabilities_ = other.capabilities_;
return *this;
}
absl::StatusOr<std::string> PromptTemplate::Apply(
const PromptTemplateInput& input) const {
nlohmann::ordered_json minijinja_inputs;
minijinja_inputs["messages"] = input.messages;
minijinja_inputs["tools"] = input.tools;
minijinja_inputs["add_generation_prompt"] = input.add_generation_prompt;
minijinja_inputs["extra_context"] = input.extra_context;
minijinja_inputs["now"] = absl::ToUnixSeconds(input.now);
minijinja_inputs["bos_token"] = input.bos_token;
minijinja_inputs["eos_token"] = input.eos_token;
auto result = minijinja_template_->apply(minijinja_inputs.dump());
if (!result.is_ok) {
return absl::InternalError(
absl::StrCat("Failed to apply template: ", std::string(result.error)));
}
return std::string(result.content);
}
absl::string_view PromptTemplate::GetTemplateSource() const {
auto source = minijinja_template_->source();
return absl::string_view(source.data(), source.size());
}
} // namespace litert::lm
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