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47 lines
1.4 KiB
47 lines
1.4 KiB
package parser
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import (
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"fmt"
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"strconv"
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"strings"
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"git.jfdev.de/JonasFranzDEV/hal/hal"
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)
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// ParseProgram parses an program by the following specification: LINE_NUMBER INSTRUCTION OPERAND(optional)
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func ParseProgram(input []string) (hal.Program, error) {
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program := make(hal.Program, len(input))
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var err error
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for index, line := range input {
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program[index], err = parseInstruction(line)
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if err != nil {
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return nil, fmt.Errorf("error while parsing line %d: %v", index+1, err)
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}
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}
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return program, nil
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}
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func parseInstruction(input string) (*hal.ProgrammedInstruction, error) {
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args := strings.Split(input, " ")
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if len(args) != 0 && len(args) != 1 {
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return nil, fmt.Errorf("malformated instruction '%s'", input)
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}
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instruction := hal.FindInstructionByName(args[0])
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if instruction == nil {
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return nil, fmt.Errorf("unknown instruction '%s'", args[0])
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}
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programmedInstruction := &hal.ProgrammedInstruction{
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Instruction: instruction,
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}
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if len(args) == 1 {
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operand, err := strconv.ParseInt(args[1], 10, 64)
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if err != nil {
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return nil, fmt.Errorf("error while parsing operand for instruction '%s': %v", input, err)
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}
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if instruction.ExecuteWithOperand == nil {
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return nil, fmt.Errorf("instruction '%s' has no operand, got operand %d", instruction.Name, operand)
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}
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programmedInstruction.Operand = operand
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}
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return programmedInstruction, nil
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}
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