george
49 lines
854 B
Go
49 lines
854 B
Go
package parser
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import (
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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)
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const DefaultFile = "input"
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func ParseFile(input *string) ([]int, error) {
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if input == nil {
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file := DefaultFile
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if len(os.Args) == 2 {
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file = os.Args[1]
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}
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inputFile, err := os.Open(file)
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if err != nil {
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return nil, fmt.Errorf("could not parse input file: %v", err)
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}
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fileData, err := io.ReadAll(inputFile)
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if err != nil {
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return nil, fmt.Errorf("could not read input file: %v", err)
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}
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fileStr := strings.TrimSpace(string(fileData))
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input = &fileStr
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}
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strNums := strings.Split(*input, ",")
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opcodes := make([]int, len(strNums))
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for i, v := range strNums {
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num, err := strconv.Atoi(v)
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if err != nil {
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fmt.Fprintf(os.Stderr, "WARNING: error parsing int from input, substring was %v", v)
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}
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opcodes[i] = num
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}
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return opcodes, nil
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}
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