Refactor everything to processors and implement json and xml processors such as they are
This commit is contained in:
328
processor/regex.go
Normal file
328
processor/regex.go
Normal file
@@ -0,0 +1,328 @@
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package processor
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import (
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"fmt"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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lua "github.com/yuin/gopher-lua"
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)
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// RegexProcessor implements the Processor interface using regex patterns
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type RegexProcessor struct {
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CompiledPattern *regexp.Regexp
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Logger Logger
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}
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// Logger interface abstracts logging functionality
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type Logger interface {
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Printf(format string, v ...interface{})
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}
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// NewRegexProcessor creates a new RegexProcessor with the given pattern
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func NewRegexProcessor(pattern *regexp.Regexp, logger Logger) *RegexProcessor {
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return &RegexProcessor{
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CompiledPattern: pattern,
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Logger: logger,
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}
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}
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// Process implements the Processor interface for RegexProcessor
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func (p *RegexProcessor) Process(filename string, pattern string, luaExpr string, originalExpr string) (int, int, error) {
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// Read file content
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fullPath := filepath.Join(".", filename)
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content, err := os.ReadFile(fullPath)
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if err != nil {
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return 0, 0, fmt.Errorf("error reading file: %v", err)
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}
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fileContent := string(content)
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if p.Logger != nil {
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p.Logger.Printf("File %s loaded: %d bytes", fullPath, len(content))
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}
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// Process the content with regex
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result, modCount, matchCount, err := p.ProcessContent(fileContent, luaExpr, filename, originalExpr)
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if err != nil {
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return 0, 0, err
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}
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if modCount == 0 {
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if p.Logger != nil {
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p.Logger.Printf("No modifications made to %s - pattern didn't match any content", fullPath)
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}
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return 0, 0, nil
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}
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// Write the modified content back
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err = os.WriteFile(fullPath, []byte(result), 0644)
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if err != nil {
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return 0, 0, fmt.Errorf("error writing file: %v", err)
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}
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if p.Logger != nil {
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p.Logger.Printf("Made %d modifications to %s and saved (%d bytes)",
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modCount, fullPath, len(result))
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}
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return modCount, matchCount, nil
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}
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// ToLua sets capture groups as Lua variables (v1, v2, etc. for numeric values and s1, s2, etc. for strings)
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func (p *RegexProcessor) ToLua(L *lua.LState, data interface{}) error {
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captures, ok := data.([]string)
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if !ok {
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return fmt.Errorf("expected []string for captures, got %T", data)
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}
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// Set variables for each capture group, starting from v1/s1 for the first capture
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for i := 1; i < len(captures); i++ {
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// Set string version (always available as s1, s2, etc.)
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L.SetGlobal(fmt.Sprintf("s%d", i), lua.LString(captures[i]))
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// Try to convert to number and set v1, v2, etc.
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if val, err := strconv.ParseFloat(captures[i], 64); err == nil {
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L.SetGlobal(fmt.Sprintf("v%d", i), lua.LNumber(val))
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} else {
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// For non-numeric values, set v to 0
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L.SetGlobal(fmt.Sprintf("v%d", i), lua.LNumber(0))
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}
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}
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return nil
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}
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// FromLua implements the Processor interface for RegexProcessor
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func (p *RegexProcessor) FromLua(L *lua.LState) (interface{}, error) {
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// Get the modified values after Lua execution
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modifications := make(map[int]string)
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// Check for modifications to v1-v12 and s1-s12
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for i := 0; i < 12; i++ {
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// Check both v and s variables to see if any were modified
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vVarName := fmt.Sprintf("v%d", i+1)
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sVarName := fmt.Sprintf("s%d", i+1)
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vLuaVal := L.GetGlobal(vVarName)
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sLuaVal := L.GetGlobal(sVarName)
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// Get the v variable if it exists
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if vLuaVal != lua.LNil {
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switch v := vLuaVal.(type) {
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case lua.LNumber:
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// Convert numeric value to string
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newNumVal := strconv.FormatFloat(float64(v), 'f', -1, 64)
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modifications[i] = newNumVal
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// We found a value, continue to next capture group
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continue
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case lua.LString:
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// Use string value directly
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newStrVal := string(v)
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modifications[i] = newStrVal
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continue
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default:
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// Convert other types to string
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newDefaultVal := fmt.Sprintf("%v", v)
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modifications[i] = newDefaultVal
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continue
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}
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}
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// Try the s variable if v variable wasn't found or couldn't be used
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if sLuaVal != lua.LNil {
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if sStr, ok := sLuaVal.(lua.LString); ok {
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newStrVal := string(sStr)
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modifications[i] = newStrVal
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continue
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}
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}
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}
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if p.Logger != nil {
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p.Logger.Printf("Final modifications map: %v", modifications)
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}
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return modifications, nil
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}
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// ProcessContent applies regex replacement with Lua processing
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func (p *RegexProcessor) ProcessContent(data string, luaExpr string, filename string, originalExpr string) (string, int, int, error) {
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L := lua.NewState()
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defer L.Close()
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// Initialize Lua environment
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modificationCount := 0
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matchCount := 0
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modifications := []ModificationRecord{}
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// Load math library
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L.Push(L.GetGlobal("require"))
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L.Push(lua.LString("math"))
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if err := L.PCall(1, 1, nil); err != nil {
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if p.Logger != nil {
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p.Logger.Printf("Failed to load Lua math library: %v", err)
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}
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return data, 0, 0, fmt.Errorf("error loading Lua math library: %v", err)
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}
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// Initialize helper functions
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if err := InitLuaHelpers(L); err != nil {
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return data, 0, 0, err
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}
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// Process all regex matches
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result := p.CompiledPattern.ReplaceAllStringFunc(data, func(match string) string {
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matchCount++
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captures := p.CompiledPattern.FindStringSubmatch(match)
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if len(captures) <= 1 {
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// No capture groups, return unchanged
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if p.Logger != nil {
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p.Logger.Printf("Match found but no capture groups: %s", LimitString(match, 50))
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}
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return match
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}
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if p.Logger != nil {
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p.Logger.Printf("Match found: %s", LimitString(match, 50))
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}
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// Pass the captures to Lua environment
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if err := p.ToLua(L, captures); err != nil {
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if p.Logger != nil {
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p.Logger.Printf("Failed to set Lua variables: %v", err)
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}
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return match
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}
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// Debug: print the Lua variables before execution
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if p.Logger != nil {
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v1 := L.GetGlobal("v1")
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s1 := L.GetGlobal("s1")
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p.Logger.Printf("Before Lua: v1=%v, s1=%v", v1, s1)
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}
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// Execute the user's Lua code
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if err := L.DoString(luaExpr); err != nil {
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if p.Logger != nil {
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p.Logger.Printf("Lua execution failed for match '%s': %v", LimitString(match, 50), err)
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}
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return match // Return unchanged on error
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}
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// Debug: print the Lua variables after execution
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if p.Logger != nil {
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v1 := L.GetGlobal("v1")
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s1 := L.GetGlobal("s1")
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p.Logger.Printf("After Lua: v1=%v, s1=%v", v1, s1)
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}
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// Get modifications from Lua
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modResult, err := p.FromLua(L)
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if err != nil {
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if p.Logger != nil {
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p.Logger.Printf("Failed to get modifications from Lua: %v", err)
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}
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return match
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}
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// Debug: print the modifications detected
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if p.Logger != nil {
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p.Logger.Printf("Modifications detected: %v", modResult)
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}
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// Apply modifications to the matched text
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modsMap, ok := modResult.(map[int]string)
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if !ok || len(modsMap) == 0 {
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p.Logger.Printf("No modifications detected after Lua script execution")
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return match // No changes
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}
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// Apply the modifications to the original match
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result := match
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for i, newVal := range modsMap {
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oldVal := captures[i+1]
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// Special handling for empty capture groups
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if oldVal == "" {
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// Find the position where the empty capture group should be
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// by analyzing the regex pattern and current match
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parts := p.CompiledPattern.SubexpNames()
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if i+1 < len(parts) && parts[i+1] != "" {
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// Named capture groups
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subPattern := fmt.Sprintf("(?P<%s>)", parts[i+1])
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emptyGroupPattern := regexp.MustCompile(subPattern)
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if loc := emptyGroupPattern.FindStringIndex(result); loc != nil {
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// Insert the new value at the capture group location
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result = result[:loc[0]] + newVal + result[loc[1]:]
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}
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} else {
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// For unnamed capture groups, we need to find where they would be in the regex
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// This is a simplification that might not work for complex regex patterns
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// but should handle the test case with <value></value>
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tagPattern := regexp.MustCompile("<value></value>")
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if loc := tagPattern.FindStringIndex(result); loc != nil {
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// Replace the empty tag content with our new value
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result = result[:loc[0]+7] + newVal + result[loc[1]-8:]
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}
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}
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} else {
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// Normal replacement for non-empty capture groups
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p.Logger.Printf("Replacing '%s' with '%s' in '%s'", oldVal, newVal, result)
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result = strings.Replace(result, oldVal, newVal, 1)
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p.Logger.Printf("After replacement: '%s'", result)
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}
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// Extract a bit of context from the match for better reporting
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contextStart := Max(0, strings.Index(match, oldVal)-10)
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contextLength := Min(30, len(match)-contextStart)
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if contextStart+contextLength > len(match) {
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contextLength = len(match) - contextStart
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}
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contextStr := "..." + match[contextStart:contextStart+contextLength] + "..."
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// Log the modification
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if p.Logger != nil {
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p.Logger.Printf("Modified value [%d]: '%s' → '%s'", i+1, LimitString(oldVal, 30), LimitString(newVal, 30))
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}
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// Record the modification for summary
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modifications = append(modifications, ModificationRecord{
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File: filename,
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OldValue: oldVal,
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NewValue: newVal,
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Operation: originalExpr,
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Context: fmt.Sprintf("(in %s)", LimitString(contextStr, 30)),
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})
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}
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modificationCount++
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return result
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})
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return result, modificationCount, matchCount, nil
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}
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// BuildLuaScript creates a complete Lua script from the expression
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func BuildLuaScript(luaExpr string) string {
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// Auto-prepend v1 for expressions starting with operators
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if strings.HasPrefix(luaExpr, "*") ||
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strings.HasPrefix(luaExpr, "/") ||
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strings.HasPrefix(luaExpr, "+") ||
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strings.HasPrefix(luaExpr, "-") ||
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strings.HasPrefix(luaExpr, "^") ||
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strings.HasPrefix(luaExpr, "%") {
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luaExpr = "v1 = v1" + luaExpr
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} else if strings.HasPrefix(luaExpr, "=") {
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// Handle direct assignment with = operator
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luaExpr = "v1 " + luaExpr
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}
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// Add assignment if needed
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if !strings.Contains(luaExpr, "=") {
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luaExpr = "v1 = " + luaExpr
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}
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return luaExpr
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}
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