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package cc
import (
"fmt"
"os"
"strings"
"github.com/elliotchance/c2go/util"
)
// fileCache contains the previous read files. This is important because
// rereading large preprocessed files is extremely expensive and they should not
// change during the life of the executable.
var fileCache map[string]map[int]string
// ResetCache must be called before the next transpile happens if the executable
// is being used to transpile multiple files.
func ResetCache() {
fileCache = nil
}
// GetLineFromPreprocessedFile returns a specific line for a file from a
// preprocessed C file.
func GetLineFromPreprocessedFile(inputFilePath, filePath string, lineNumber int) (string, error) {
// Only load the file once.
if fileCache == nil {
fileCache = map[string]map[int]string{}
inputFile, err := os.ReadFile(inputFilePath)
if err != nil {
return "", err
}
lines := strings.Split(string(inputFile), "\n")
currentFile := ""
currentLine := 1
// There is also an integer that appears after the path - not sure what this
// is? I will ignore it for now.
resetLineRegexp := util.GetRegex(`^# (\d+) "(.+)"`)
for _, line := range lines {
if len(line) > 0 && line[0] == '#' {
matches := resetLineRegexp.FindStringSubmatch(line)
// Ignore other preprocessor lines like: #pragma pack(4)
if len(matches) == 0 {
continue
}
currentLine = util.Atoi(matches[1])
// unescape windows file paths
currentFile = strings.Replace(matches[2], "\\\\", "\\", -1)
if _, ok := fileCache[currentFile]; !ok {
fileCache[currentFile] = map[int]string{}
}
continue
}
fileCache[currentFile][currentLine] = line
currentLine++
}
}
if _, ok := fileCache[filePath]; !ok {
return "", fmt.Errorf("could not find file %s", filePath)
}
if line, ok := fileCache[filePath][lineNumber]; ok {
return line, nil
}
return "", fmt.Errorf("could not find %s:%d", filePath, lineNumber)
}
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