英文:
How to compute the offset from column and line number ? - Go
问题
我需要使用列号和行号作为参考来计算源代码文件中的偏移量（例如source.go:23:42）。如何计算偏移量？我正在使用一些Go工具（oracle、ast和token）来分析源代码。
英文:
I need to compute the offset in a source code file using a column and line number as reference (e.g. source.go:23:42). How can I compute the offset ? I'm using it to analyse the source code with some go tools(oracle, ast and token).
答案1
得分: 2
由于行宽不固定，无法快速知道偏移量。您需要逐个字符遍历文件内容并计算偏移量。可以使用以下类似的代码：
func findOffset(fileText string, line, column int) int {// 记录当前行和列的位置currentCol := 1currentLine := 1for offset, ch := range fileText {// 检查是否找到了目标位置if currentLine == line && currentCol == column {return offset}// 换行符 - 增加行计数器并重置列if ch == '\n' {currentLine++currentCol = 1} else {currentCol++}}return -1 // 未找到}// 这是我们的源代码示例var sampleText = `package mainvar foo = "hello"var bar = "world"`func main() {fmt.Println(findOffset(sampleText, 1, 1)) // 输出 0fmt.Println(findOffset(sampleText, 3, 5)) // 输出 18}
Playground链接：http://play.golang.org/p/fWb9N9r9pi
英文:
Since line width isn't fixed, there's no quick way of knowing that. you need to traverse the file's content character by character and count the offset. something like:
func findOffset(fileText string, line, column int) int {// we count our current line and column positioncurrentCol := 1currentLine := 1for offset,ch := range fileText {// see if we found where we wanted to go toif currentLine == line && currentCol == column {return offset}// line break - increment the line counter and reset the columnif ch == '\n' {currentLine++currentCol = 1} else {currentCol++}}return -1; //not found}// this here is our source code for examplevar sampleText = `package mainvar foo = "hello"var bar ="world"`func main() {fmt.Println(findOffset(sampleText, 1, 1)) //prints 0fmt.Println(findOffset(sampleText, 3, 5)) //prints 18}
Playground link: http://play.golang.org/p/fWb9N9r9pi
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