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53 lines
1.6 KiB
53 lines
1.6 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)
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for index, line := range input {
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args := strings.Split(line, " ")
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if len(args) <= 1 {
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continue
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}
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lineNumber, err := strconv.ParseInt(args[0], 10, 64)
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if err != nil {
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return nil, fmt.Errorf("invalid line number at file line %d: %s", index, args[0])
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}
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program[lineNumber], err = parseInstruction(args[1:])
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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(args []string) (*hal.ProgrammedInstruction, error) {
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if len(args) != 1 && len(args) != 2 {
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return nil, fmt.Errorf("invalid instruction args count (count = %d)", len(args))
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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) == 2 {
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operand, err := strconv.ParseFloat(args[1], 64)
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if err != nil {
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return nil, fmt.Errorf("error while parsing operand for instruction '%s': %v", args[0], 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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