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stringSliceParse.go
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/
stringSliceParse.go
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package checksetter
import (
"fmt"
"go/ast"
"go/parser"
"github.com/nickwells/check.mod/check"
)
const (
strSlcCFName = "check.StringSlice"
strSlcCFDesc = "string slice check func"
)
type strSlcCFMaker func(*ast.CallExpr, string) (check.StringSlice, error)
var strSlcCFArgsToFunc map[string]strSlcCFMaker
func init() {
strSlcCFArgsToFunc = map[string]strSlcCFMaker{
"": makeStrSlcCF,
"int": makeStrSlcCFInt,
"int, int": makeStrSlcCFIntInt,
strCFName: makeStrSlcCFStrCF,
strCFName + " ...": makeStrSlcCFStrCFList,
strCFName + ", string": makeStrSlcCFStrCFStr,
strSlcCFName + ", string": makeStrSlcCFStrSlcCFStr,
strSlcCFName + " ...": makeStrSlcCFStrSlcCFList,
}
}
var strSlcCFNoParam = map[string]check.StringSlice{
"NoDups": check.StringSliceNoDups,
}
var strSlcCFInt = map[string]func(int) check.StringSlice{
"LenEQ": check.StringSliceLenEQ,
"LenGT": check.StringSliceLenGT,
"LenLT": check.StringSliceLenLT,
}
var strSlcCFIntInt = map[string]func(int, int) check.StringSlice{
"LenBetween": check.StringSliceLenBetween,
}
var strSlcCFStrCF = map[string]func(check.String) check.StringSlice{
"String": check.StringSliceStringCheck,
}
var strSlcCFStrCFList = map[string]func(...check.String) check.StringSlice{
"StringCheckByPos": check.StringSliceStringCheckByPos,
}
var strSlcCFStrCFStr = map[string]func(check.String, string) check.StringSlice{
"Contains": check.StringSliceContains,
}
var strSlcCFStrSlcCFStr = map[string]func(check.StringSlice, string) check.StringSlice{
"Not": check.StringSliceNot,
}
var strSlcCFStrSlcCFList = map[string]func(...check.StringSlice) check.StringSlice{
"And": check.StringSliceAnd,
"Or": check.StringSliceOr,
}
// makeStrSlcCF returns a StringSlice checker corresponding to the
// given name - this is for checkers that are not parameterised
func makeStrSlcCF(e *ast.CallExpr, fName string) (cf check.StringSlice, err error) {
errIntro := fmt.Sprintf("can't make the %s func: %s():",
strSlcCFName, fName)
if e != nil {
if err = checkArgCount(e, 0); err != nil {
return nil, fmt.Errorf("%s %s", errIntro, err)
}
}
if f, ok := strSlcCFNoParam[fName]; ok {
return f, nil
}
return nil, fmt.Errorf("%s the name is not recognised", errIntro)
}
// makeStrSlcCFInt returns a StringSlice checker corresponding to the
// given name - this is for checkers that take a single integer parameter
func makeStrSlcCFInt(e *ast.CallExpr, fName string) (cf check.StringSlice, err error) {
var i int64
errIntro := func() string {
return fmt.Sprintf("can't make the %s func: %s(%d):",
strSlcCFName, fName, i)
}
defer func() {
if r := recover(); r != nil {
cf = nil
err = fmt.Errorf("%s %v", errIntro(), r)
}
}()
if err = checkArgCount(e, 1); err != nil {
return nil, fmt.Errorf("%s %s", errIntro(), err)
}
i, err = getArgAsInt(e, 0)
if err != nil {
return nil, fmt.Errorf("%s %s", errIntro(), err)
}
if f, ok := strSlcCFInt[fName]; ok {
return f(int(i)), nil
}
return nil, fmt.Errorf("%s the name is not recognised", errIntro())
}
// makeStrSlcCFIntInt returns a StringSlice checker corresponding to the
// given name - this is for checkers that take two integer parameters
func makeStrSlcCFIntInt(e *ast.CallExpr, fName string) (cf check.StringSlice, err error) {
var i, j int64
errIntro := func() string {
return fmt.Sprintf("can't make the %s func: %s(%d, %d):",
strSlcCFName, fName, i, j)
}
defer func() {
if r := recover(); r != nil {
cf = nil
err = fmt.Errorf("%s %v", errIntro(), r)
}
}()
if err = checkArgCount(e, 2); err != nil {
return nil, fmt.Errorf("%s %s", errIntro(), err)
}
i, err = getArgAsInt(e, 0)
if err != nil {
return nil, fmt.Errorf("%s %s", errIntro(), err)
}
j, err = getArgAsInt(e, 1)
if err != nil {
return nil, fmt.Errorf("%s %s", errIntro(), err)
}
if f, ok := strSlcCFIntInt[fName]; ok {
return f(int(i), int(j)), nil
}
return nil, fmt.Errorf("%s the name is not recognised", errIntro())
}
// makeStrSlcCFStrCF returns a StringSlice checker corresponding to the
// given name - this is for checkers that take a string check parameter
func makeStrSlcCFStrCF(e *ast.CallExpr, fName string) (cf check.StringSlice, err error) {
errIntro := "can't make the " + strSlcCFName +
" func: " + fName + "(" + strCFName + "):"
defer func() {
if r := recover(); r != nil {
cf = nil
err = fmt.Errorf("%s %v", errIntro, r)
}
}()
if err = checkArgCount(e, 1); err != nil {
return nil, fmt.Errorf("%s %s", errIntro, err)
}
argExpr, err := getArg(e, 0)
if err != nil {
return nil, fmt.Errorf("%s can't get the %s argument: %s",
errIntro, strCFName, err)
}
scf, err := getFuncStrCF(argExpr)
if err != nil {
return nil, fmt.Errorf("%s can't convert argument %d to %s: %s",
errIntro, 0, strCFName, err)
}
if f, ok := strSlcCFStrCF[fName]; ok {
return f(scf), nil
}
return nil, fmt.Errorf("%s the name is not recognised", errIntro)
}
// makeStrSlcCFStrCFStr returns a StringSlice checker corresponding to the
// given name - this is for checkers that take a string check parameter and a
// string
func makeStrSlcCFStrCFStr(e *ast.CallExpr, fName string) (cf check.StringSlice, err error) {
var s string
errIntro := func() string {
return fmt.Sprintf("can't make the %s func: %s(%s, %s):",
strSlcCFName, fName, strCFName, s)
}
defer func() {
if r := recover(); r != nil {
cf = nil
err = fmt.Errorf("%s %v", errIntro(), r)
}
}()
if err = checkArgCount(e, 2); err != nil {
return nil, fmt.Errorf("%s %s", errIntro(), err)
}
argExpr, err := getArg(e, 0)
if err != nil {
return nil, fmt.Errorf("%s can't get the %s argument: %s",
errIntro(), strCFName, err)
}
scf, err := getFuncStrCF(argExpr)
if err != nil {
return nil, fmt.Errorf("%s can't convert argument %d to %s: %s",
errIntro(), 0, strCFName, err)
}
s, err = getArgAsString(e, 1)
if err != nil {
return nil, fmt.Errorf("%s %s", errIntro(), err)
}
if f, ok := strSlcCFStrCFStr[fName]; ok {
return f(scf, s), nil
}
return nil, fmt.Errorf("%s the name is not recognised", errIntro())
}
// makeStrSlcCFStrCFList returns a StringSlice checker corresponding to
// the given name - this is for checkers that take a list of string
// check funcs
func makeStrSlcCFStrCFList(e *ast.CallExpr, fName string) (cf check.StringSlice, err error) {
errIntro := "can't make the " + strSlcCFName +
" func: " + fName + "(" + strSlcCFName + " ...):"
defer func() {
if r := recover(); r != nil {
cf = nil
err = fmt.Errorf("%s %v", errIntro, r)
}
}()
fArgs := make([]check.String, 0, len(e.Args))
for i, argExpr := range e.Args {
scf, err := getFuncStrCF(argExpr)
if err != nil {
return nil, fmt.Errorf("%s can't convert argument %d to %s: %s",
errIntro, i, strCFName, err)
}
fArgs = append(fArgs, scf)
}
if f, ok := strSlcCFStrCFList[fName]; ok {
return f(fArgs...), nil
}
return nil, fmt.Errorf("%s the name is not recognised", errIntro)
}
// makeStrSlcCFStrSlcCFStr returns a StringSlice checker corresponding to the
// given name - this is for checkers that take a string slice check func and
// a string
func makeStrSlcCFStrSlcCFStr(e *ast.CallExpr, fName string) (cf check.StringSlice, err error) {
var s string
errIntro := func() string {
return fmt.Sprintf("can't make the %s func: %s(%s, %s):",
strSlcCFName, fName, strSlcCFName, s)
}
defer func() {
if r := recover(); r != nil {
cf = nil
err = fmt.Errorf("%s %v", errIntro(), r)
}
}()
if err = checkArgCount(e, 2); err != nil {
return nil, fmt.Errorf("%s %s", errIntro(), err)
}
argExpr, err := getArg(e, 0)
if err != nil {
return nil, fmt.Errorf("%s can't get the %s argument: %s",
errIntro(), strSlcCFName, err)
}
sscf, err := getFuncStrSlcCF(argExpr)
if err != nil {
return nil, fmt.Errorf("%s can't convert argument %d to %s: %s",
errIntro(), 0, strSlcCFName, err)
}
s, err = getArgAsString(e, 1)
if err != nil {
return nil, fmt.Errorf("%s %s", errIntro(), err)
}
if f, ok := strSlcCFStrSlcCFStr[fName]; ok {
return f(sscf, s), nil
}
return nil, fmt.Errorf("%s the name is not recognised", errIntro())
}
// makeStrSlcCFStrSlcCFList returns a StringSlice checker corresponding to
// the given name - this is for checkers that take a list of string slice
// check funcs
func makeStrSlcCFStrSlcCFList(e *ast.CallExpr, fName string) (cf check.StringSlice, err error) {
errIntro := "can't make the " + strSlcCFName +
" func: " + fName + "(" + strSlcCFName + " ...):"
defer func() {
if r := recover(); r != nil {
cf = nil
err = fmt.Errorf("%s %v", errIntro, r)
}
}()
fArgs := make([]check.StringSlice, 0, len(e.Args))
for i, argExpr := range e.Args {
sscf, err := getFuncStrSlcCF(argExpr)
if err != nil {
return nil, fmt.Errorf("%s can't convert argument %d to %s: %s",
errIntro, i, strSlcCFName, err)
}
fArgs = append(fArgs, sscf)
}
if f, ok := strSlcCFStrSlcCFList[fName]; ok {
return f(fArgs...), nil
}
return nil, fmt.Errorf("%s the name is not recognised", errIntro)
}
// stringSliceCFParse returns a slice of string slice check functions and a nil
// error if the string is successfully parsed or nil and an error if the
// string couldn't be converted to a slice of check functions.
func stringSliceCFParse(s string) ([]check.StringSlice, error) {
expr, err := parser.ParseExpr("[]T{\n" + s + "}")
if err != nil {
return nil, err
}
v := make([]check.StringSlice, 0, 1)
cl, ok := expr.(*ast.CompositeLit)
if !ok {
return nil, fmt.Errorf("unexpected type for the collection of %s: %T",
strSlcCFDesc, expr)
}
_, ok = cl.Type.(*ast.ArrayType)
if !ok {
return nil, fmt.Errorf("unexpected type for the array of %s: %T",
strSlcCFDesc, cl.Type)
}
for _, elt := range cl.Elts {
f, err := getFuncStrSlcCF(elt)
if err != nil {
return nil, fmt.Errorf("bad function: %s", err)
}
v = append(v, f)
}
return v, nil
}
// getFuncStrSlcCF will process the expression and return a string slice
// checker or nil
func getFuncStrSlcCF(elt ast.Expr) (cf check.StringSlice, err error) {
e, ok := elt.(*ast.CallExpr)
if !ok {
if eIdent, ok := elt.(*ast.Ident); ok {
return makeStrSlcCF((*ast.CallExpr)(nil), eIdent.Name)
}
return nil, fmt.Errorf("unexpected type: %T", elt)
}
defer func() {
if r := recover(); r != nil {
cf = nil
err = fmt.Errorf("can't make the %s func: %v", strSlcCFName, r)
}
}()
fd, err := getFuncDetails(e, strSlcCFName)
if err != nil {
return nil, err
}
makeF, ok := strSlcCFArgsToFunc[fd.expectedArgs]
if ok {
return makeF(e, fd.name)
} else {
return nil, fmt.Errorf("%s has an unrecognised argument list: %s",
fd.name, fd.expectedArgs)
}
}