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Copy pathcommand_parse.go
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220 lines (184 loc) · 6.23 KB
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package cli
import (
"fmt"
"strings"
"unicode"
)
const (
providedButNotDefinedErrMsg = "flag provided but not defined: -"
argumentNotProvidedErrMsg = "flag needs an argument: "
)
// flagFromError tries to parse a provided flag from an error message. If the
// parsing fails, it returns the input error and an empty string
func flagFromError(err error) (string, error) {
errStr := err.Error()
trimmed := strings.TrimPrefix(errStr, providedButNotDefinedErrMsg)
if errStr == trimmed {
return "", err
}
return trimmed, nil
}
func (cmd *Command) parseFlags(args Args) (Args, error) {
tracef("parsing flags from arguments %[1]q (cmd=%[2]q)", args, cmd.Name)
cmd.setFlags = map[Flag]struct{}{}
cmd.appliedFlags = cmd.allFlags()
tracef("walking command lineage for persistent flags (cmd=%[1]q)", cmd.Name)
for pCmd := cmd.parent; pCmd != nil; pCmd = pCmd.parent {
tracef(
"checking ancestor command=%[1]q for persistent flags (cmd=%[2]q)",
pCmd.Name, cmd.Name,
)
for _, fl := range pCmd.Flags {
flNames := fl.Names()
pfl, ok := fl.(LocalFlag)
if !ok || pfl.IsLocal() {
tracef("skipping non-persistent flag %[1]q (cmd=%[2]q)", flNames, cmd.Name)
continue
}
tracef(
"checking for applying persistent flag=%[1]q pCmd=%[2]q (cmd=%[3]q)",
flNames, pCmd.Name, cmd.Name,
)
applyPersistentFlag := true
for _, name := range flNames {
if cmd.lFlag(name) != nil {
applyPersistentFlag = false
break
}
}
if !applyPersistentFlag {
tracef("not applying as persistent flag=%[1]q (cmd=%[2]q)", flNames, cmd.Name)
continue
}
tracef("applying as persistent flag=%[1]q (cmd=%[2]q)", flNames, cmd.Name)
tracef("appending to applied flags flag=%[1]q (cmd=%[2]q)", flNames, cmd.Name)
cmd.appliedFlags = append(cmd.appliedFlags, fl)
}
}
tracef("parsing flags iteratively tail=%[1]q (cmd=%[2]q)", args.Tail(), cmd.Name)
defer tracef("done parsing flags (cmd=%[1]q)", cmd.Name)
posArgs := []string{}
for rargs := args.Slice(); len(rargs) > 0; rargs = rargs[1:] {
tracef("rearrange:1 (cmd=%[1]q) %[2]q", cmd.Name, rargs)
firstArg := strings.TrimSpace(rargs[0])
if len(firstArg) == 0 {
break
}
// stop parsing once we see a "--"
if firstArg == "--" {
posArgs = append(posArgs, rargs[1:]...)
return &stringSliceArgs{posArgs}, nil
}
// Check if we've reached the Nth argument and should stop flag parsing
if cmd.StopOnNthArg != nil && len(posArgs) == *cmd.StopOnNthArg {
// Append current arg and all remaining args without parsing
posArgs = append(posArgs, rargs[0:]...)
return &stringSliceArgs{posArgs}, nil
}
// handle positional args
if firstArg[0] != '-' {
// positional argument probably
tracef("rearrange-3 (cmd=%[1]q) check %[2]q", cmd.Name, firstArg)
// if there is a command by that name let the command handle the
// rest of the parsing
if cmd.Command(firstArg) != nil {
posArgs = append(posArgs, rargs...)
return &stringSliceArgs{posArgs}, nil
}
posArgs = append(posArgs, firstArg)
continue
}
numMinuses := 1
// this is same as firstArg == "-"
if len(firstArg) == 1 {
posArgs = append(posArgs, firstArg)
break
}
shortOptionHandling := cmd.useShortOptionHandling()
// stop parsing -- as short flags
if firstArg[1] == '-' {
numMinuses++
shortOptionHandling = false
} else if !unicode.IsLetter(rune(firstArg[1])) {
// this is not a flag
tracef("parseFlags not a unicode letter. Stop parsing")
posArgs = append(posArgs, rargs...)
return &stringSliceArgs{posArgs}, nil
}
tracef("parseFlags (shortOptionHandling=%[1]q)", shortOptionHandling)
flagName := firstArg[numMinuses:]
flagVal := ""
tracef("flagName:1 (fName=%[1]q)", flagName)
if index := strings.Index(flagName, "="); index != -1 {
flagVal = flagName[index+1:]
flagName = flagName[:index]
}
tracef("flagName:2 (fName=%[1]q) (fVal=%[2]q)", flagName, flagVal)
f := cmd.lookupFlag(flagName)
// found a flag matching given flagName
if f != nil {
tracef("Trying flag type (fName=%[1]q) (type=%[2]T)", flagName, f)
if fb, ok := f.(boolFlag); ok && fb.IsBoolFlag() {
if flagVal == "" {
flagVal = "true"
}
tracef("parse Apply bool flag (fName=%[1]q) (fVal=%[2]q)", flagName, flagVal)
if err := cmd.set(flagName, f, flagVal); err != nil {
return &stringSliceArgs{posArgs}, err
}
continue
}
tracef("processing non bool flag (fName=%[1]q)", flagName)
// not a bool flag so need to get the next arg
if flagVal == "" {
if len(rargs) == 1 {
return &stringSliceArgs{posArgs}, fmt.Errorf("%s%s", argumentNotProvidedErrMsg, firstArg)
}
flagVal = rargs[1]
rargs = rargs[1:]
}
tracef("setting non bool flag (fName=%[1]q) (fVal=%[2]q)", flagName, flagVal)
if err := cmd.set(flagName, f, flagVal); err != nil {
return &stringSliceArgs{posArgs}, err
}
continue
}
// no flag lookup found and short handling is disabled
if !shortOptionHandling {
return &stringSliceArgs{posArgs}, fmt.Errorf("%s%s", providedButNotDefinedErrMsg, flagName)
}
// try to split the flags
for index, c := range flagName {
tracef("processing flag (fName=%[1]q)", string(c))
if sf := cmd.lookupFlag(string(c)); sf == nil {
return &stringSliceArgs{posArgs}, fmt.Errorf("%s%s", providedButNotDefinedErrMsg, flagName)
} else if fb, ok := sf.(boolFlag); ok && fb.IsBoolFlag() {
fv := flagVal
if index == (len(flagName)-1) && flagVal == "" {
fv = "true"
}
if fv == "" {
fv = "true"
}
if err := cmd.set(flagName, sf, fv); err != nil {
tracef("processing flag.2 (fName=%[1]q)", string(c))
return &stringSliceArgs{posArgs}, err
}
} else if index == len(flagName)-1 { // last flag can take an arg
if flagVal == "" {
if len(rargs) == 1 {
return &stringSliceArgs{posArgs}, fmt.Errorf("%s%s", argumentNotProvidedErrMsg, string(c))
}
flagVal = rargs[1]
}
tracef("parseFlags (flagName %[1]q) (flagVal %[2]q)", flagName, flagVal)
if err := cmd.set(flagName, sf, flagVal); err != nil {
tracef("processing flag.4 (fName=%[1]q)", string(c))
return &stringSliceArgs{posArgs}, err
}
}
}
}
tracef("returning-2 (cmd=%[1]q) args %[2]q", cmd.Name, posArgs)
return &stringSliceArgs{posArgs}, nil
}