This commit is contained in:
wehub-resource-sync
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#include "dsml_parser.h"
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#include <algorithm>
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#include <cstdio>
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#include <cstring>
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#include <chrono>
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#include <random>
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#include <string>
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#include <vector>
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namespace ds4cpp {
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namespace {
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constexpr const char *kThinkOpen = "<think>";
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constexpr const char *kThinkClose = "</think>";
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constexpr const char *kToolsOpen = "<\xef\xbd\x9c" "DSML\xef\xbd\x9c" "tool_calls>"; // <｜DSML｜tool_calls>
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constexpr const char *kToolsClose = "</\xef\xbd\x9c" "DSML\xef\xbd\x9c" "tool_calls>"; // </｜DSML｜tool_calls>
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constexpr const char *kInvokeOpenPfx = "<\xef\xbd\x9c" "DSML\xef\xbd\x9c" "invoke name=\""; // <｜DSML｜invoke name="
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constexpr const char *kInvokeClose = "</\xef\xbd\x9c" "DSML\xef\xbd\x9c" "invoke>"; // </｜DSML｜invoke>
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constexpr const char *kParamOpenPfx = "<\xef\xbd\x9c" "DSML\xef\xbd\x9c" "parameter name=\""; // <｜DSML｜parameter name="
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constexpr const char *kParamClose = "</\xef\xbd\x9c" "DSML\xef\xbd\x9c" "parameter>"; // </｜DSML｜parameter>
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// All structural markers the parser might encounter - used to detect "buf
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// might be a partial marker, don't drain yet" conditions.
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const std::vector<std::string> &all_markers() {
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static const std::vector<std::string> v = {
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kThinkOpen, kThinkClose,
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kToolsOpen, kToolsClose,
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kInvokeOpenPfx, kInvokeClose,
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kParamOpenPfx, kParamClose,
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};
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return v;
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}
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// Returns true if `buf` could be a *prefix* of any marker (i.e., we should
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// wait for more text before draining as plain content). The marker-prefix
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// loop handles fixed markers exactly. For markers with variable-length
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// internal data (kInvokeOpenPfx, kParamOpenPfx have an open quote, then the
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// tool/param name, then a closing quote and `>`), we also wait while buf
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// starts with `<` and has not yet seen a `>`: the leading `<` could be the
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// start of one of those open markers, or a literal that we can confirm only
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// once we know what follows. Anything after the first `>` arrives is either
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// consumed by TryConsumeMarker or emitted as a literal `<` by the caller.
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bool looks_like_prefix(const std::string &buf) {
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for (const auto &m : all_markers()) {
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if (m.size() > buf.size() && m.compare(0, buf.size(), buf) == 0) return true;
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}
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if (!buf.empty() && buf[0] == '<' && buf.find('>') == std::string::npos) {
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return true;
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}
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return false;
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}
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bool consume_literal(std::string &buf, const std::string &lit) {
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if (buf.compare(0, lit.size(), lit) == 0) {
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buf.erase(0, lit.size());
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return true;
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}
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return false;
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}
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// Find the next '<' in buf starting at offset; returns std::string::npos if none.
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size_t next_tag(const std::string &buf, size_t off = 0) {
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return buf.find('<', off);
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}
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std::string json_escape(const std::string &in) {
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std::string out;
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out.reserve(in.size() + 2);
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for (char c : in) {
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switch (c) {
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case '"': out += "\\\""; break;
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case '\\': out += "\\\\"; break;
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case '\b': out += "\\b"; break;
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case '\f': out += "\\f"; break;
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case '\n': out += "\\n"; break;
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case '\r': out += "\\r"; break;
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case '\t': out += "\\t"; break;
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default:
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if (static_cast<unsigned char>(c) < 0x20) {
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char tmp[8];
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std::snprintf(tmp, sizeof(tmp), "\\u%04x", c);
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out += tmp;
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} else {
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out += c;
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}
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}
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}
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return out;
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}
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} // namespace
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DsmlParser::DsmlParser() = default;
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bool DsmlParser::IsInDsmlStructural() const {
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switch (state_) {
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case State::TOOL_CALLS:
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case State::INVOKE:
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return true;
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case State::PARAM_VALUE: // payload bytes; user sampling applies
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case State::TEXT:
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case State::THINK:
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return false;
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}
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return false;
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}
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void DsmlParser::EmitArgsChunk(const std::string &chunk, std::vector<ParserEvent> &out) {
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if (chunk.empty()) return;
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ParserEvent e;
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e.type = ParserEvent::TOOL_ARGS;
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e.text = chunk;
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e.index = tool_index_;
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out.push_back(std::move(e));
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}
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void DsmlParser::FinishCurrentToolCall(std::vector<ParserEvent> &out) {
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if (tool_index_ < 0) return;
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// Close the JSON object that was opened on the first parameter.
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if (args_emitted_open_brace_) {
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EmitArgsChunk("}", out);
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} else {
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EmitArgsChunk("{}", out);
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}
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ParserEvent e;
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e.type = ParserEvent::TOOL_END;
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e.index = tool_index_;
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out.push_back(std::move(e));
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current_tool_name_.clear();
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args_emitted_open_brace_ = false;
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args_param_count_ = 0;
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}
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bool DsmlParser::TryConsumeMarker(std::vector<ParserEvent> &out) {
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switch (state_) {
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case State::TEXT: {
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if (consume_literal(buf_, kThinkOpen)) { state_ = State::THINK; return true; }
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if (consume_literal(buf_, kToolsOpen)) { state_ = State::TOOL_CALLS; return true; }
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return false;
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}
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case State::THINK: {
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if (consume_literal(buf_, kThinkClose)) { state_ = State::TEXT; return true; }
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return false;
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}
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case State::TOOL_CALLS: {
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if (consume_literal(buf_, kToolsClose)) { state_ = State::TEXT; return true; }
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// <｜DSML｜invoke name="X">
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if (buf_.compare(0, std::strlen(kInvokeOpenPfx), kInvokeOpenPfx) == 0) {
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size_t close_q = buf_.find('"', std::strlen(kInvokeOpenPfx));
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if (close_q == std::string::npos) return false; // need more bytes
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size_t close_gt = buf_.find('>', close_q);
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if (close_gt == std::string::npos) return false;
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current_tool_name_ = buf_.substr(std::strlen(kInvokeOpenPfx),
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close_q - std::strlen(kInvokeOpenPfx));
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tool_index_++;
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buf_.erase(0, close_gt + 1);
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ParserEvent e;
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e.type = ParserEvent::TOOL_START;
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e.tool_name = current_tool_name_;
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e.tool_id = RandomToolId();
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e.index = tool_index_;
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out.push_back(std::move(e));
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args_emitted_open_brace_ = false;
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args_param_count_ = 0;
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state_ = State::INVOKE;
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return true;
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}
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return false;
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}
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case State::INVOKE: {
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if (consume_literal(buf_, kInvokeClose)) {
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FinishCurrentToolCall(out);
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state_ = State::TOOL_CALLS;
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return true;
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}
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// <｜DSML｜parameter name="K" string="true|false">
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if (buf_.compare(0, std::strlen(kParamOpenPfx), kParamOpenPfx) == 0) {
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size_t close_q = buf_.find('"', std::strlen(kParamOpenPfx));
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if (close_q == std::string::npos) return false;
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size_t string_attr = buf_.find("string=\"", close_q);
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if (string_attr == std::string::npos) return false;
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size_t string_q = buf_.find('"', string_attr + 8);
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if (string_q == std::string::npos) return false;
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size_t close_gt = buf_.find('>', string_q);
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if (close_gt == std::string::npos) return false;
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param_name_ = buf_.substr(std::strlen(kParamOpenPfx),
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close_q - std::strlen(kParamOpenPfx));
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std::string string_val = buf_.substr(string_attr + 8,
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string_q - (string_attr + 8));
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param_is_string_ = (string_val == "true");
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param_value_.clear();
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buf_.erase(0, close_gt + 1);
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// Emit args JSON opener / separator.
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std::string opener;
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if (!args_emitted_open_brace_) { opener = "{"; args_emitted_open_brace_ = true; }
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else { opener = ","; }
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opener += "\"" + json_escape(param_name_) + "\":";
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if (param_is_string_) opener += "\"";
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EmitArgsChunk(opener, out);
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args_param_count_++;
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state_ = State::PARAM_VALUE;
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return true;
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}
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return false;
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}
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case State::PARAM_VALUE: {
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if (consume_literal(buf_, kParamClose)) {
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if (param_is_string_) EmitArgsChunk("\"", out);
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state_ = State::INVOKE;
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return true;
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}
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return false;
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}
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}
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return false;
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}
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void DsmlParser::DrainPlain(std::vector<ParserEvent> &out) {
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// Drain everything up to the next '<' that *might* start a marker.
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// Anything before the next '<' is safe to emit; the '<...' tail stays buffered.
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while (!buf_.empty()) {
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size_t lt = next_tag(buf_, 0);
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if (lt == std::string::npos) {
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// No tag at all - emit (or accumulate) the whole buffer.
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ParserEvent e;
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if (state_ == State::PARAM_VALUE) {
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std::string esc = param_is_string_ ? json_escape(buf_) : buf_;
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EmitArgsChunk(esc, out);
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} else if (state_ == State::THINK) {
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e.type = ParserEvent::REASONING;
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e.text = buf_;
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out.push_back(std::move(e));
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} else if (state_ == State::TEXT) {
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e.type = ParserEvent::CONTENT;
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e.text = buf_;
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out.push_back(std::move(e));
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}
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// Inside INVOKE / TOOL_CALLS with no marker, raw bytes are
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// structural whitespace - discard.
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buf_.clear();
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return;
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}
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if (lt > 0) {
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std::string chunk = buf_.substr(0, lt);
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buf_.erase(0, lt);
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ParserEvent e;
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if (state_ == State::PARAM_VALUE) {
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std::string esc = param_is_string_ ? json_escape(chunk) : chunk;
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EmitArgsChunk(esc, out);
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} else if (state_ == State::THINK) {
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e.type = ParserEvent::REASONING;
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e.text = chunk;
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out.push_back(std::move(e));
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} else if (state_ == State::TEXT) {
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e.type = ParserEvent::CONTENT;
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e.text = chunk;
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out.push_back(std::move(e));
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}
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}
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// buf_[0] == '<' - try consuming a marker. If we consumed one, loop again.
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if (!TryConsumeMarker(out)) {
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// Could be a partial marker - wait for more bytes.
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if (looks_like_prefix(buf_)) return;
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// Otherwise this '<' is a literal - emit one char and continue.
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std::string one(1, buf_[0]);
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buf_.erase(0, 1);
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ParserEvent e;
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if (state_ == State::PARAM_VALUE) {
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std::string esc = param_is_string_ ? json_escape(one) : one;
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EmitArgsChunk(esc, out);
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} else if (state_ == State::THINK) {
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e.type = ParserEvent::REASONING;
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e.text = one;
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out.push_back(std::move(e));
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} else if (state_ == State::TEXT) {
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e.type = ParserEvent::CONTENT;
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e.text = one;
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out.push_back(std::move(e));
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}
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}
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}
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}
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void DsmlParser::Feed(const std::string &chunk, std::vector<ParserEvent> &out) {
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buf_ += chunk;
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DrainPlain(out);
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}
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void DsmlParser::Flush(std::vector<ParserEvent> &out) {
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// At flush time we no longer wait for marker completion - drain everything
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// (the trailing bytes won't grow). Mirror DrainPlain's state-aware
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// classification: PARAM_VALUE bytes become TOOL_ARGS, THINK bytes become
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// REASONING, TEXT bytes become CONTENT, and INVOKE/TOOL_CALLS bytes are
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// structural whitespace (discarded).
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auto emit_plain = [&](const std::string &chunk) {
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if (chunk.empty()) return;
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if (state_ == State::PARAM_VALUE) {
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std::string esc = param_is_string_ ? json_escape(chunk) : chunk;
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EmitArgsChunk(esc, out);
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return;
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}
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if (state_ == State::THINK) {
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ParserEvent e;
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e.type = ParserEvent::REASONING;
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e.text = chunk;
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out.push_back(std::move(e));
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return;
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}
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if (state_ == State::TEXT) {
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ParserEvent e;
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e.type = ParserEvent::CONTENT;
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e.text = chunk;
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out.push_back(std::move(e));
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return;
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}
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// INVOKE / TOOL_CALLS: structural whitespace, discard.
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};
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while (!buf_.empty()) {
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size_t lt = next_tag(buf_, 0);
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if (lt == std::string::npos) {
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emit_plain(buf_);
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buf_.clear();
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return;
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}
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if (lt > 0) {
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std::string chunk = buf_.substr(0, lt);
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buf_.erase(0, lt);
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emit_plain(chunk);
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}
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if (!TryConsumeMarker(out)) {
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// Definitely a literal '<' now (no chance of more bytes arriving).
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std::string one(1, buf_[0]);
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buf_.erase(0, 1);
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emit_plain(one);
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}
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}
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// If we ended mid-tool-call (model truncated), close it cleanly.
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if (state_ == State::INVOKE || state_ == State::PARAM_VALUE) {
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if (state_ == State::PARAM_VALUE && param_is_string_) EmitArgsChunk("\"", out);
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FinishCurrentToolCall(out);
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state_ = State::TEXT;
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}
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}
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std::string RandomToolId() {
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static thread_local std::mt19937_64 rng{
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static_cast<uint64_t>(std::chrono::system_clock::now().time_since_epoch().count())};
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const char *alphabet =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
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std::string out = "call_";
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for (int i = 0; i < 16; ++i) {
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out += alphabet[rng() % 62];
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}
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return out;
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}
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} // namespace ds4cpp
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