mirror of
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299 lines
8.2 KiB
Go
299 lines
8.2 KiB
Go
package functions
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// a golang port of https://github.com/ggerganov/llama.cpp/pull/1887
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import (
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"encoding/json"
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"fmt"
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"regexp"
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"sort"
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"strings"
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)
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const (
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JSONBNF = `root ::= object
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value ::= object | array | string | number | ("true" | "false" | "null") ws
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object ::=
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"{" ws (
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string ":" ws value
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("," ws string ":" ws value)*
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)? "}" ws
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array ::=
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"[" ws (
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value
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("," ws value)*
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)? "]" ws
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string ::=
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"\"" (
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[^"\\] |
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"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) # escapes
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)* "\"" ws
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number ::= ("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? ws
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ws ::= ([ \t\n] ws)?`
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)
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var (
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SPACE_RULE = `" "?`
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PRIMITIVE_RULES = map[string]string{
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"boolean": `("true" | "false") space`,
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"number": `("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? space`,
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"integer": `("-"? ([0-9] | [1-9] [0-9]*)) space`,
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"string": `"\"" (
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[^"\\] |
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"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])
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)* "\"" space`,
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"null": `"null" space`,
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}
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INVALID_RULE_CHARS_RE = regexp.MustCompile(`[^a-zA-Z0-9-]+`)
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GRAMMAR_LITERAL_ESCAPE_RE = regexp.MustCompile(`[\r\n"]`)
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GRAMMAR_LITERAL_ESCAPES = map[string]string{
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"\r": `\r`,
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"\n": `\n`,
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`"`: `\"`,
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}
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)
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type JSONSchemaConverter struct {
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propOrder map[string]int
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rules map[string]string
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}
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func NewJSONSchemaConverter(propOrder string) *JSONSchemaConverter {
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propOrderSlice := strings.Split(propOrder, ",")
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propOrderMap := make(map[string]int)
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for idx, name := range propOrderSlice {
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propOrderMap[name] = idx
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}
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rules := make(map[string]string)
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rules["space"] = SPACE_RULE
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return &JSONSchemaConverter{
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propOrder: propOrderMap,
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rules: rules,
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}
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}
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func (sc *JSONSchemaConverter) formatLiteral(literal interface{}) string {
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escaped := GRAMMAR_LITERAL_ESCAPE_RE.ReplaceAllStringFunc(jsonString(literal), func(match string) string {
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return GRAMMAR_LITERAL_ESCAPES[match]
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})
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return fmt.Sprintf(`"%s"`, escaped)
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}
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func (sc *JSONSchemaConverter) addRule(name, rule string) string {
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escName := INVALID_RULE_CHARS_RE.ReplaceAllString(name, "-")
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key := escName
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if existingRule, ok := sc.rules[escName]; ok && existingRule != rule {
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i := 0
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for {
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key = fmt.Sprintf("%s%d", escName, i)
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if _, ok := sc.rules[key]; !ok {
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break
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}
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i++
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}
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}
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sc.rules[key] = rule
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return key
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}
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const array = `arr ::=
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"[\n" (
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realvalue
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(",\n" realvalue)*
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)? "]"`
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func (sc *JSONSchemaConverter) finalizeGrammar(maybeArray bool) string {
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var lines []string
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// write down the computed rules.
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// if maybeArray is true, we need to add the array rule and slightly tweak the root rule
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for name, rule := range sc.rules {
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if maybeArray && name == "root" {
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name = "realvalue"
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}
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lines = append(lines, fmt.Sprintf("%s ::= %s", name, rule))
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}
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if maybeArray {
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lines = append(lines, fmt.Sprintf("%s ::= %s", "root", "arr | realvalue"))
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lines = append(lines, array)
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}
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return strings.Join(lines, "\n")
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}
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func (sc *JSONSchemaConverter) visit(schema map[string]interface{}, name string, rootSchema map[string]interface{}) string {
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st, existType := schema["type"]
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var schemaType string
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if existType {
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schemaType = st.(string)
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}
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ruleName := name
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if name == "" {
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ruleName = "root"
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}
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_, oneOfExists := schema["oneOf"]
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_, anyOfExists := schema["anyOf"]
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if oneOfExists || anyOfExists {
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var alternatives []string
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oneOfSchemas, oneOfExists := schema["oneOf"].([]interface{})
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anyOfSchemas, anyOfExists := schema["anyOf"].([]interface{})
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if oneOfExists {
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for i, altSchema := range oneOfSchemas {
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alternative := sc.visit(altSchema.(map[string]interface{}), fmt.Sprintf("%s-%d", ruleName, i), rootSchema)
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alternatives = append(alternatives, alternative)
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}
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} else if anyOfExists {
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for i, altSchema := range anyOfSchemas {
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alternative := sc.visit(altSchema.(map[string]interface{}), fmt.Sprintf("%s-%d", ruleName, i), rootSchema)
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alternatives = append(alternatives, alternative)
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}
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}
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rule := strings.Join(alternatives, " | ")
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return sc.addRule(ruleName, rule)
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} else if ref, exists := schema["$ref"].(string); exists {
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referencedSchema := sc.resolveReference(ref, rootSchema)
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return sc.visit(referencedSchema, name, rootSchema)
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} else if constVal, exists := schema["const"]; exists {
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return sc.addRule(ruleName, sc.formatLiteral(constVal))
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} else if enumVals, exists := schema["enum"].([]interface{}); exists {
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var enumRules []string
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for _, enumVal := range enumVals {
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enumRule := sc.formatLiteral(enumVal)
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enumRules = append(enumRules, enumRule)
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}
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rule := strings.Join(enumRules, " | ")
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return sc.addRule(ruleName, rule)
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} else if properties, exists := schema["properties"].(map[string]interface{}); schemaType == "object" && exists {
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propOrder := sc.propOrder
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var propPairs []struct {
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propName string
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propSchema map[string]interface{}
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}
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for propName, propSchema := range properties {
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propPairs = append(propPairs, struct {
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propName string
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propSchema map[string]interface{}
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}{propName: propName, propSchema: propSchema.(map[string]interface{})})
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}
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sort.Slice(propPairs, func(i, j int) bool {
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iOrder := propOrder[propPairs[i].propName]
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jOrder := propOrder[propPairs[j].propName]
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if iOrder != 0 && jOrder != 0 {
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return iOrder < jOrder
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}
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return propPairs[i].propName < propPairs[j].propName
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})
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var rule strings.Builder
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rule.WriteString(`"{" space`)
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for i, propPair := range propPairs {
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propName := propPair.propName
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propSchema := propPair.propSchema
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propRuleName := sc.visit(propSchema, fmt.Sprintf("%s-%s", ruleName, propName), rootSchema)
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if i > 0 {
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rule.WriteString(` "," space`)
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}
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rule.WriteString(fmt.Sprintf(` %s space ":" space %s`, sc.formatLiteral(propName), propRuleName))
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}
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rule.WriteString(` "}" space`)
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return sc.addRule(ruleName, rule.String())
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} else if items, exists := schema["items"].(map[string]interface{}); schemaType == "array" && exists {
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itemRuleName := sc.visit(items, fmt.Sprintf("%s-item", ruleName), rootSchema)
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rule := fmt.Sprintf(`"[" space (%s ("," space %s)*)? "]" space`, itemRuleName, itemRuleName)
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return sc.addRule(ruleName, rule)
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} else {
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primitiveRule, exists := PRIMITIVE_RULES[schemaType]
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if !exists {
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panic(fmt.Sprintf("Unrecognized schema: %v", schema))
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}
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if ruleName == "root" {
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schemaType = "root"
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}
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return sc.addRule(schemaType, primitiveRule)
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}
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}
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func (sc *JSONSchemaConverter) resolveReference(ref string, rootSchema map[string]interface{}) map[string]interface{} {
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if !strings.HasPrefix(ref, "#/$defs/") {
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panic(fmt.Sprintf("Invalid reference format: %s", ref))
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}
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defKey := strings.TrimPrefix(ref, "#/$defs/")
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definitions, exists := rootSchema["$defs"].(map[string]interface{})
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if !exists {
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fmt.Println(rootSchema)
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panic("No definitions found in the schema")
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}
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def, exists := definitions[defKey].(map[string]interface{})
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if !exists {
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fmt.Println(definitions)
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panic(fmt.Sprintf("Definition not found: %s", defKey))
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}
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return def
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}
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func (sc *JSONSchemaConverter) Grammar(schema map[string]interface{}, maybeArray bool) string {
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sc.visit(schema, "", schema)
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return sc.finalizeGrammar(maybeArray)
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}
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func (sc *JSONSchemaConverter) GrammarFromBytes(b []byte, maybeArray bool) string {
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var schema map[string]interface{}
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_ = json.Unmarshal(b, &schema)
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return sc.Grammar(schema, maybeArray)
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}
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func jsonString(v interface{}) string {
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b, _ := json.Marshal(v)
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return string(b)
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}
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type FunctionName struct {
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Const string `json:"const"`
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}
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type Properties struct {
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Function FunctionName `json:"function"`
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Arguments Argument `json:"arguments"`
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}
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type Argument struct {
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Type string `json:"type"`
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Properties map[string]interface{} `json:"properties"`
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}
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type Item struct {
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Type string `json:"type"`
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Properties Properties `json:"properties"`
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}
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type JSONFunctionStructure struct {
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OneOf []Item `json:"oneOf,omitempty"`
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AnyOf []Item `json:"anyOf,omitempty"`
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Defs map[string]interface{} `json:"$defs,omitempty"`
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}
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func (j JSONFunctionStructure) Grammar(propOrder string, maybeArray bool) string {
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dat, _ := json.Marshal(j)
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return NewJSONSchemaConverter(propOrder).GrammarFromBytes(dat, maybeArray)
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}
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