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<?php |
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; // Exit if accessed directly! |
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} |
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|
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if ( ! class_exists( 'WPSC_AIBOT_Tool_Utils' ) ) : |
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|
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final class WPSC_AIBOT_Tool_Utils { |
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|
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/** |
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* Build provider-agnostic tool array for model call. |
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* |
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* @param string $store_id Vector store id for retrieval tool. |
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* @param array $tools Function tool definitions. |
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* @return array |
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*/ |
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public static function build_openai_tools( $store_id = '', $tools = array() ) { |
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|
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$openai_tools = array(); |
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|
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if ( is_array( $tools ) && ! empty( $tools ) ) { |
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foreach ( $tools as $tool ) { |
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if ( ! is_array( $tool ) || empty( $tool['name'] ) || empty( $tool['description'] ) ) { |
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continue; |
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} |
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|
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$parameters = $tool['parameters'] ?? ( $tool['input_schema'] ?? array() ); |
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if ( ! is_array( $parameters ) || empty( $parameters['type'] ) ) { |
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continue; |
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} |
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|
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$openai_tools[] = array( |
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'type' => 'function', |
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'name' => sanitize_key( (string) $tool['name'] ), |
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'description' => sanitize_text_field( (string) $tool['description'] ), |
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'parameters' => $parameters, |
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'strict' => false, |
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); |
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} |
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} |
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|
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return $openai_tools; |
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} |
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|
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/** |
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* Extract tool call from OpenAI response output. |
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* |
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* @param array $body Response body. |
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* @return array|null |
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*/ |
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public static function extract_openai_tool_call( $body ) { |
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|
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if ( ! is_array( $body ) ) { |
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return null; |
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} |
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|
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foreach ( $body['output'] ?? array() as $output ) { |
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if ( empty( $output['type'] ) || 'function_call' !== $output['type'] || empty( $output['name'] ) ) { |
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continue; |
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} |
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|
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$arguments = array(); |
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if ( isset( $output['arguments'] ) ) { |
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if ( is_array( $output['arguments'] ) ) { |
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$arguments = $output['arguments']; |
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} elseif ( is_string( $output['arguments'] ) && trim( $output['arguments'] ) !== '' ) { |
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$arguments = json_decode( $output['arguments'], true ); |
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if ( json_last_error() !== JSON_ERROR_NONE || ! is_array( $arguments ) ) { |
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$arguments = array(); |
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} |
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} |
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} |
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|
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return array( |
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'name' => sanitize_key( (string) $output['name'] ), |
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'arguments' => $arguments, |
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'call_id' => ! empty( $output['call_id'] ) ? sanitize_text_field( $output['call_id'] ) : '', |
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); |
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} |
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|
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return null; |
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} |
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|
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/** |
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* Build Gemini-compatible tools array for model call. |
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* |
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* @param string $store_name File search store name for retrieval tool. |
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* @param array $tools Function tool definitions. |
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* @return array |
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*/ |
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public static function build_gemini_tools( $store_name = '', $tools = array() ) { |
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|
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$gemini_tools = array(); |
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$declarations = array(); |
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|
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if ( is_array( $tools ) && ! empty( $tools ) ) { |
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foreach ( $tools as $tool ) { |
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if ( ! is_array( $tool ) || empty( $tool['name'] ) || empty( $tool['description'] ) ) { |
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continue; |
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} |
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|
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$parameters = $tool['parameters'] ?? ( $tool['input_schema'] ?? array() ); |
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$parameters = self::sanitize_gemini_schema( $parameters ); |
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if ( ! is_array( $parameters ) || empty( $parameters['type'] ) ) { |
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continue; |
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} |
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|
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$declarations[] = array( |
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'name' => sanitize_key( (string) $tool['name'] ), |
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'description' => sanitize_text_field( (string) $tool['description'] ), |
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'parameters' => $parameters, |
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); |
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} |
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} |
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|
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if ( ! empty( $declarations ) ) { |
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$gemini_tools[] = array( |
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'function_declarations' => $declarations, |
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); |
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} |
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|
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return $gemini_tools; |
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} |
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|
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/** |
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* Extract tool call from Gemini response body. |
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* |
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* Some Gemini models occasionally ignore the native function-calling |
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* protocol and instead write the intended call out as pseudocode text |
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* (e.g. 'print(default_api.search_knowledge_base(query="..."))'). If no |
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* structured functionCall part is present, fall back to detecting that |
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* pattern in the response text so the call still executes instead of |
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* leaking raw pseudocode to the customer - see parse_pseudocode_tool_call(). |
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* |
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* @param array $body Response body. |
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* @param array $known_tool_names Registered tool names for this turn, used |
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* to validate a pseudocode-text fallback match. |
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* @return array|null |
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*/ |
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public static function extract_gemini_tool_call( $body, $known_tool_names = array() ) { |
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|
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if ( ! is_array( $body ) || empty( $body['candidates'] ) || ! is_array( $body['candidates'] ) ) { |
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return null; |
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} |
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|
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$text_parts = array(); |
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|
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foreach ( $body['candidates'] as $candidate ) { |
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$parts = $candidate['content']['parts'] ?? array(); |
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if ( ! is_array( $parts ) || empty( $parts ) ) { |
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continue; |
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} |
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|
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foreach ( $parts as $part ) { |
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$call = array(); |
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if ( ! empty( $part['functionCall'] ) && is_array( $part['functionCall'] ) ) { |
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$call = $part['functionCall']; |
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} elseif ( ! empty( $part['function_call'] ) && is_array( $part['function_call'] ) ) { |
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$call = $part['function_call']; |
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} |
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|
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if ( empty( $call['name'] ) ) { |
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if ( ! empty( $part['text'] ) && is_string( $part['text'] ) ) { |
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$text_parts[] = $part['text']; |
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} |
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continue; |
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} |
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|
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$args = array(); |
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if ( isset( $call['args'] ) ) { |
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if ( is_array( $call['args'] ) ) { |
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$args = $call['args']; |
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} elseif ( is_string( $call['args'] ) && trim( $call['args'] ) !== '' ) { |
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$decoded = json_decode( $call['args'], true ); |
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if ( json_last_error() === JSON_ERROR_NONE && is_array( $decoded ) ) { |
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$args = $decoded; |
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} |
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} |
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} |
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|
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return array( |
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'name' => sanitize_key( (string) $call['name'] ), |
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'arguments' => $args, |
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'call_id' => '', |
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); |
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} |
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} |
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|
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if ( ! empty( $text_parts ) ) { |
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return self::parse_pseudocode_tool_call( implode( "\n", $text_parts ), $known_tool_names ); |
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} |
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|
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return null; |
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} |
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|
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/** |
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* Best-effort recovery for a tool call written out as pseudocode text |
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* instead of a native functionCall - e.g. |
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* 'print(default_api.search_knowledge_base(query="trial period"))' or |
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* 'default_api.detect_spam(is_spam=true)'. Only tool arguments matching |
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* the flat string/boolean shape our tools use are supported; anything |
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* else is left unparsed (returns null) rather than guessed at. |
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* |
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* @param string $text Candidate response text. |
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* @param array $known_tool_names Registered tool names to validate the match against. |
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* @return array|null |
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*/ |
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private static function parse_pseudocode_tool_call( $text, $known_tool_names = array() ) { |
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|
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$text = trim( (string) $text ); |
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if ( '' === $text ) { |
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return null; |
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} |
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|
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// Unwrap a single optional print( ... ) wrapper. |
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if ( 1 === preg_match( '/^print\s*\((.*)\)\s*$/s', $text, $unwrapped ) ) { |
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$text = trim( $unwrapped[1] ); |
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} |
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|
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if ( 1 !== preg_match( '/^default_api\s*\.\s*([A-Za-z_][A-Za-z0-9_]*)\s*\((.*)\)\s*$/s', $text, $matches ) ) { |
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return null; |
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} |
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|
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$name = sanitize_key( $matches[1] ); |
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if ( ! empty( $known_tool_names ) && ! in_array( $name, $known_tool_names, true ) ) { |
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return null; |
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} |
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|
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$arguments = array(); |
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if ( 1 === preg_match_all( '/([A-Za-z_][A-Za-z0-9_]*)\s*=\s*("(?:[^"\\\\]|\\\\.)*"|\'(?:[^\'\\\\]|\\\\.)*\'|[^,]+)/', $matches[2], $pairs, PREG_SET_ORDER ) ) { |
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|
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foreach ( $pairs as $pair ) { |
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$key = sanitize_key( $pair[1] ); |
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$value = trim( $pair[2] ); |
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if ( strlen( $value ) >= 2 && ( ( '"' === $value[0] && '"' === substr( $value, -1 ) ) || ( "'" === $value[0] && "'" === substr( $value, -1 ) ) ) ) { |
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$value = substr( $value, 1, -1 ); |
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} |
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$arguments[ $key ] = stripslashes( $value ); |
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} |
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} |
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|
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return array( |
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'name' => $name, |
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'arguments' => $arguments, |
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'call_id' => '', |
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); |
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} |
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|
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/** |
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* Sanitize JSON schema for Gemini function declarations. |
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* |
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* Gemini schema rejects some JSON Schema keywords (e.g. additionalProperties). |
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* |
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* @param mixed $schema Schema node. |
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* @return mixed |
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*/ |
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private static function sanitize_gemini_schema( $schema ) { |
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|
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if ( ! is_array( $schema ) ) { |
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return $schema; |
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} |
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|
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foreach ( $schema as $key => $value ) { |
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if ( 'additionalProperties' === $key ) { |
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unset( $schema[ $key ] ); |
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continue; |
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} |
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|
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// 'properties' is a map/Struct field in Gemini's schema, not a |
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// repeating one - a parameter-less tool's empty PHP array would |
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// otherwise encode as JSON `[]`, which Gemini rejects outright |
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// ("Cannot bind a list to map for field 'properties'"), failing |
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// every tool call this turn, not just this one tool's, since all |
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// declarations are sent together. Force an object cast so it |
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// always encodes as `{}` instead. |
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if ( 'properties' === $key && is_array( $value ) && empty( $value ) ) { |
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$schema[ $key ] = (object) array(); |
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continue; |
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} |
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|
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if ( is_array( $value ) ) { |
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$schema[ $key ] = self::sanitize_gemini_schema( $value ); |
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} |
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} |
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|
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return $schema; |
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} |
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|
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/** |
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* Build standard tool-call response payload. |
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* |
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* @param array $tool_call Tool call payload. |
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* @param int $prompt_tokens Prompt tokens. |
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* @param int $completion_tokens Completion tokens. |
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* @param int $total_tokens Total tokens. |
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* @return array |
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*/ |
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public static function make_tool_call_response( $tool_call, $prompt_tokens, $completion_tokens, $total_tokens ) { |
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|
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return array( |
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'success' => true, |
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'response' => '', |
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'create_ticket' => false, |
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'tool_call' => $tool_call, |
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'prompt_tokens' => (int) $prompt_tokens, |
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'completion_tokens' => (int) $completion_tokens, |
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'total_tokens' => (int) $total_tokens, |
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); |
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} |
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} |
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|
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endif; |
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|
