Agent-System-Backend/internal/prompts/parse.go

// Package prompts 实现提示词库（prompt-library）：内置库 embed 加载、用户覆盖链、
// 触发匹配与 system 组装。提示词是数据不是代码——文案变更走库文件 diff。
package prompts

import (
	"fmt"
	"strconv"
	"strings"

	core "agent-system-core"
)

// ParseModuleFile 解析一个库文件（frontmatter + 正文）。
// frontmatter 语法（刻意最小，不引 YAML 依赖）：
//
//	id: task.doc-minutes
//	layer: task
//	version: 1
//	title: 会议纪要
//	description: 依据上传文档生成完整会议纪要
//	priority: 60
//	requiresAttachments: true
//	outputContract: |
//	  多行契约文本（缩进块，支持）
//	triggers:
//	  - kind: intent
//	    keywords: 纪要, 会议记录
//	  - kind: command
//	    command: /minutes
func ParseModuleFile(name, content string) (core.PromptModule, error) {
	m := core.PromptModule{Source: string(core.SourceBuiltin)}
	if !strings.HasPrefix(content, "---\n") {
		return m, fmt.Errorf("%s: missing frontmatter", name)
	}
	end := strings.Index(content[4:], "\n---\n")
	if end < 0 {
		return m, fmt.Errorf("%s: unterminated frontmatter", name)
	}
	fm := content[4 : 4+end]
	m.Body = strings.TrimLeft(content[4+end+5:], "\n")

	lines := strings.Split(fm, "\n")
	var trigger *core.PromptTrigger
	blockKey := "" // 当前块标量（outputContract: |）归属的键
	for i := 0; i < len(lines); i++ {
		line := lines[i]
		if strings.TrimSpace(line) == "" {
			continue
		}
		if blockKey != "" {
			// 块标量体：任何非空且带缩进的行并入；遇到顶格键结束块。
			if line[0] == ' ' || line[0] == '\t' {
				appendBlock(&m, blockKey, strings.TrimSpace(line))
				continue
			}
			blockKey = ""
		}
		indented := line[0] == ' ' || line[0] == '\t'
		trimmed := strings.TrimSpace(line)
		if strings.HasPrefix(trimmed, "- ") {
			if indented {
				return m, fmt.Errorf("%s: nested list unsupported: %q", name, trimmed)
			}
			k, v := splitKV(strings.TrimPrefix(trimmed, "- "))
			if k != "kind" {
				return m, fmt.Errorf("%s: list item outside triggers: %q", name, trimmed)
			}
			m.Triggers = append(m.Triggers, core.PromptTrigger{Kind: v})
			trigger = &m.Triggers[len(m.Triggers)-1]
			continue
		}
		k, v := splitKV(trimmed)
		if indented && trigger != nil {
			switch k {
			case "keywords":
				trigger.Keywords = splitList(v)
			case "command":
				trigger.Command = v
			default:
				return m, fmt.Errorf("%s: unknown trigger field %q", name, k)
			}
			continue
		}
		if indented {
			return m, fmt.Errorf("%s: unexpected indented line %q", name, trimmed)
		}
		if v == "|" {
			blockKey = k
			continue
		}
		switch k {
		case "id":
			m.ID = v
		case "layer":
			m.Layer = v
		case "version":
			m.Version = atoi(v)
		case "title":
			m.Title = v
		case "description":
			m.Description = v
		case "priority":
			m.Priority = atoi(v)
		case "requiresAttachments":
			m.RequiresAttachments = v == "true"
		case "outputContract":
			m.OutputContract = v
		case "triggers":
			// 值留空；列表项由后续 "- kind:" 行提供。
		case "tools":
			m.Tools = splitList(v)
		case "model":
			m.Model = v
		case "maxTurns":
			m.MaxTurns = atoi(v)
		default:
			return m, fmt.Errorf("%s: unknown field %q", name, k)
		}
	}
	if m.ID == "" || m.Layer == "" || m.Body == "" {
		return m, fmt.Errorf("%s: id/layer/body required", name)
	}
	if m.Version == 0 {
		m.Version = 1
	}
	return m, nil
}

// SubagentSpec 是子代理 profile。空字段表示沿用内置。
type SubagentSpec struct {
	Tools    []string
	Model    string
	MaxTurns int
}

// specFromModule 由模块字段派生 profile。未写 model 时用 lightweight；
// maxTurns 为 0 表示不限制轮次。
func specFromModule(m core.PromptModule) SubagentSpec {
	spec := SubagentSpec{Tools: m.Tools, Model: m.Model, MaxTurns: m.MaxTurns}
	if spec.Model == "" {
		spec.Model = "lightweight"
	}
	return spec
}

// ParseSubagentSpec 从库文件 frontmatter 取出 tools、model、maxTurns。
// 标准模块字段可以同时出现。其他未知键报错。
func ParseSubagentSpec(content string) (SubagentSpec, error) {
	m, err := ParseModuleFile("subagent", content)
	if err != nil {
		return SubagentSpec{}, err
	}
	return specFromModule(m), nil
}

func appendBlock(m *core.PromptModule, key, line string) {
	switch key {
	case "outputContract":
		if m.OutputContract == "" {
			m.OutputContract = line
		} else {
			m.OutputContract += "\n" + line
		}
	}
}

// splitKV 拆 "key: value"。
func splitKV(s string) (string, string) {
	i := strings.Index(s, ":")
	if i < 0 {
		return s, ""
	}
	return strings.TrimSpace(s[:i]), strings.TrimSpace(s[i+1:])
}

func splitList(s string) []string {
	var out []string
	for _, p := range strings.Split(s, ",") {
		if p = strings.TrimSpace(p); p != "" {
			out = append(out, p)
		}
	}
	return out
}

func atoi(s string) int {
	n, _ := strconv.Atoi(strings.TrimSpace(s))
	return n
}