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query_function_parser.go
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/
query_function_parser.go
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package parser
import (
"errors"
"fmt"
"strings"
"github.com/benthosdev/benthos/v4/internal/bloblang/query"
)
func functionArgsParser(pCtx Context) Func[[]any] {
return func(input []rune) Result[[]any] {
return DelimitedPattern(
Expect(Sequence(charBracketOpen, DiscardedWhitespaceNewlineComments), "function arguments"),
MustBe(Expect(
OneOf(
FuncAsAny(namedArgParser(pCtx)),
FuncAsAny(queryParser(pCtx)),
), "function argument"),
),
MustBe(Expect(Sequence(Discard(SpacesAndTabs), charComma, DiscardedWhitespaceNewlineComments), "comma")),
MustBe(Expect(Sequence(DiscardedWhitespaceNewlineComments, charBracketClose), "closing bracket")),
)(input)
}
}
type namedArg struct {
name string
value any
}
func namedArgParser(pCtx Context) Func[namedArg] {
pattern := Sequence(
FuncAsAny(SnakeCase),
FuncAsAny(charColon),
FuncAsAny(Discard(SpacesAndTabs)),
FuncAsAny(MustBe(Expect(queryParser(pCtx), "argument value"))),
)
return func(input []rune) Result[namedArg] {
res := pattern(input)
if res.Err != nil {
return Fail[namedArg](res.Err, input)
}
resSlice := res.Payload
return Success(namedArg{name: resSlice[0].(string), value: resSlice[3]}, res.Remaining)
}
}
func parseMapExpression(fn query.Function, pCtx Context) Func[query.Function] {
// foo.(bar | baz)
// ^---------^
pattern := TakeOnly(2, Sequence(
strToQuery(Expect(charBracketOpen, "method")),
strToQuery(DiscardedWhitespaceNewlineComments),
queryParser(pCtx),
strToQuery(DiscardedWhitespaceNewlineComments),
strToQuery(charBracketClose),
))
return func(input []rune) Result[query.Function] {
res := pattern(input)
if res.Err != nil {
return res
}
method, err := query.NewMapMethod(fn, res.Payload)
if err != nil {
res.Err = NewFatalError(input, err)
res.Remaining = input
} else {
res.Payload = method
}
return res
}
}
func parseFunctionTail(fn query.Function, pCtx Context) Func[query.Function] {
return OneOf(
// foo.(bar | baz)
// ^---------^
parseMapExpression(fn, pCtx),
// foo.bar()
// ^---^
methodParser(fn, pCtx),
// foo.bar
// ^-^
fieldReferenceParser(fn),
)
}
func parseWithTails(fnParser Func[query.Function], pCtx Context) Func[query.Function] {
delimPattern := Sequence(charDot, DiscardedWhitespaceNewlineComments)
mightNot := Sequence(
FuncAsAny(Optional(TakeOnly(0, Sequence(
Char('!'),
Discard(SpacesAndTabs),
)))),
FuncAsAny(fnParser),
)
return func(input []rune) Result[query.Function] {
var seq []any
var remaining []rune
if res := mightNot(input); res.Err != nil {
return Fail[query.Function](res.Err, input)
} else {
seq = res.Payload
remaining = res.Remaining
}
isNot := seq[0].(string) == "!"
fn := seq[1].(query.Function)
for {
if res := delimPattern(remaining); res.Err != nil {
if isNot {
fn = query.Not(fn)
}
return Success(fn, res.Remaining)
} else {
remaining = res.Remaining
}
if res := MustBe(parseFunctionTail(fn, pCtx))(remaining); res.Err != nil {
return Fail[query.Function](res.Err, input)
} else {
fn = res.Payload
remaining = res.Remaining
}
}
}
}
func quotedPathSegmentParser(input []rune) Result[string] {
res := QuotedString(input)
if res.Err != nil {
return res
}
// Convert into a JSON pointer style path string.
rawSegment := strings.ReplaceAll(res.Payload, "~", "~0")
rawSegment = strings.ReplaceAll(rawSegment, ".", "~1")
return Success(rawSegment, res.Remaining)
}
var fieldReferencePattern = Expect(
OneOf(
JoinStringPayloads(
UntilFail(
OneOf(
InRange('a', 'z'),
InRange('A', 'Z'),
InRange('0', '9'),
charUnderscore,
),
),
),
quotedPathSegmentParser,
),
"field path",
)
func fieldReferenceParser(ctxFn query.Function) Func[query.Function] {
return func(input []rune) Result[query.Function] {
res := fieldReferencePattern(input)
if res.Err != nil {
return Fail[query.Function](res.Err, input)
}
fn, err := query.NewGetMethod(ctxFn, res.Payload)
if err != nil {
return Fail[query.Function](NewFatalError(input, err), input)
}
return Success(fn, res.Remaining)
}
}
var variableReferencePattern = Expect(
Sequence(
charDollar,
JoinStringPayloads(
UntilFail(
OneOf(
InRange('a', 'z'),
InRange('A', 'Z'),
InRange('0', '9'),
charUnderscore,
),
),
),
),
"variable path",
)
func variableReferenceParser(input []rune) Result[query.Function] {
res := variableReferencePattern(input)
if res.Err != nil {
return Fail[query.Function](res.Err, input)
}
return Success(query.NewVarFunction(res.Payload[1]), res.Remaining)
}
var metadataReferencePattern = Expect(
Sequence(
Char('@'),
Optional(OneOf(
JoinStringPayloads(
UntilFail(
OneOf(
InRange('a', 'z'),
InRange('A', 'Z'),
InRange('0', '9'),
charUnderscore,
),
),
),
QuotedString,
)),
),
"metadata path",
)
func metadataReferenceParser(input []rune) Result[query.Function] {
res := metadataReferencePattern(input)
if res.Err != nil {
return Fail[query.Function](res.Err, input)
}
return Success(query.NewMetaFunction(res.Payload[1]), res.Remaining)
}
var fieldReferenceRootPattern = Expect(
JoinStringPayloads(
UntilFail(
OneOf(
InRange('a', 'z'),
InRange('A', 'Z'),
InRange('0', '9'),
charUnderscore,
),
),
),
"field path",
)
func fieldReferenceRootParser(pCtx Context) Func[query.Function] {
return func(input []rune) Result[query.Function] {
res := fieldReferenceRootPattern(input)
if res.Err != nil {
return Fail[query.Function](res.Err, input)
}
var fn query.Function
path := res.Payload
if path == "this" {
fn = query.NewFieldFunction("")
} else if path == "root" {
fn = query.NewRootFieldFunction("")
} else {
if pCtx.HasNamedContext(path) {
fn = query.NewNamedContextFieldFunction(path, "")
} else {
// TODO V5: Remove this and force this, root, or named contexts
fn = query.NewFieldFunction(path)
}
}
return Success(fn, res.Remaining)
}
}
func extractArgsParserResult(paramsDef query.Params, args []any) (*query.ParsedParams, error) {
var namelessArgs []any
var namedArgs map[string]any
for _, arg := range args {
namedArg, isNamed := arg.(namedArg)
if isNamed {
if namedArgs == nil {
namedArgs = map[string]any{}
}
if _, exists := namedArgs[namedArg.name]; exists {
return nil, fmt.Errorf("duplicate named arg: %v", namedArg.name)
}
namedArgs[namedArg.name] = namedArg.value
} else {
namelessArgs = append(namelessArgs, arg)
}
}
if len(namelessArgs) > 0 && len(namedArgs) > 0 {
return nil, errors.New("cannot mix named and nameless arguments")
}
var parsedParams *query.ParsedParams
var err error
if len(namedArgs) > 0 {
parsedParams, err = paramsDef.PopulateNamed(namedArgs)
} else {
parsedParams, err = paramsDef.PopulateNameless(namelessArgs...)
}
if err != nil {
return nil, err
}
return parsedParams, nil
}
func methodParser(fn query.Function, pCtx Context) Func[query.Function] {
p := Sequence(FuncAsAny(Expect(SnakeCase, "method")), FuncAsAny(functionArgsParser(pCtx)))
return func(input []rune) Result[query.Function] {
res := p(input)
if res.Err != nil {
return Fail[query.Function](res.Err, input)
}
seqSlice := res.Payload
targetMethod := seqSlice[0].(string)
params, err := pCtx.Methods.Params(targetMethod)
if err != nil {
return Fail[query.Function](NewFatalError(res.Remaining, err), input)
}
parsedParams, err := extractArgsParserResult(params, seqSlice[1].([]any))
if err != nil {
return Fail[query.Function](NewFatalError(res.Remaining, err), input)
}
method, err := pCtx.InitMethod(targetMethod, fn, parsedParams)
if err != nil {
return Fail[query.Function](NewFatalError(res.Remaining, err), input)
}
return Success(method, res.Remaining)
}
}
func functionParser(pCtx Context) Func[query.Function] {
p := Sequence(FuncAsAny(Expect(SnakeCase, "function")), FuncAsAny(functionArgsParser(pCtx)))
return func(input []rune) Result[query.Function] {
res := p(input)
if res.Err != nil {
return Fail[query.Function](res.Err, input)
}
seqSlice := res.Payload
targetFunc := seqSlice[0].(string)
params, err := pCtx.Functions.Params(targetFunc)
if err != nil {
return Fail[query.Function](NewFatalError(res.Remaining, err), input)
}
parsedParams, err := extractArgsParserResult(params, seqSlice[1].([]any))
if err != nil {
return Fail[query.Function](NewFatalError(res.Remaining, err), input)
}
fn, err := pCtx.InitFunction(targetFunc, parsedParams)
if err != nil {
return Fail[query.Function](NewFatalError(res.Remaining, err), input)
}
return Success(fn, res.Remaining)
}
}