mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-25 07:40:19 +00:00
906 lines
28 KiB
Go
906 lines
28 KiB
Go
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// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package parser declares an expression parser with support for macro
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// expansion.
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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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"sync"
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"github.com/antlr/antlr4/runtime/Go/antlr"
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"github.com/google/cel-go/common"
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"github.com/google/cel-go/common/operators"
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"github.com/google/cel-go/common/runes"
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"github.com/google/cel-go/parser/gen"
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exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
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structpb "google.golang.org/protobuf/types/known/structpb"
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)
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// Parser encapsulates the context necessary to perform parsing for different expressions.
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type Parser struct {
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options
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}
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// NewParser builds and returns a new Parser using the provided options.
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func NewParser(opts ...Option) (*Parser, error) {
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p := &Parser{}
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for _, opt := range opts {
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if err := opt(&p.options); err != nil {
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return nil, err
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}
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}
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if p.maxRecursionDepth == 0 {
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p.maxRecursionDepth = 250
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}
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if p.maxRecursionDepth == -1 {
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p.maxRecursionDepth = int((^uint(0)) >> 1)
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}
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if p.errorRecoveryTokenLookaheadLimit == 0 {
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p.errorRecoveryTokenLookaheadLimit = 256
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}
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if p.errorRecoveryLimit == 0 {
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p.errorRecoveryLimit = 30
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}
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if p.errorRecoveryLimit == -1 {
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p.errorRecoveryLimit = int((^uint(0)) >> 1)
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}
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if p.expressionSizeCodePointLimit == 0 {
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p.expressionSizeCodePointLimit = 100_000
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}
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if p.expressionSizeCodePointLimit == -1 {
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p.expressionSizeCodePointLimit = int((^uint(0)) >> 1)
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}
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// Bool is false by default, so populateMacroCalls will be false by default
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return p, nil
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}
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// mustNewParser does the work of NewParser and panics if an error occurs.
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//
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// This function is only intended for internal use and is for backwards compatibility in Parse and
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// ParseWithMacros, where we know the options will result in an error.
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func mustNewParser(opts ...Option) *Parser {
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p, err := NewParser(opts...)
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if err != nil {
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panic(err)
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}
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return p
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}
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// Parse parses the expression represented by source and returns the result.
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func (p *Parser) Parse(source common.Source) (*exprpb.ParsedExpr, *common.Errors) {
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impl := parser{
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errors: &parseErrors{common.NewErrors(source)},
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helper: newParserHelper(source),
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macros: p.macros,
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maxRecursionDepth: p.maxRecursionDepth,
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errorRecoveryLimit: p.errorRecoveryLimit,
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errorRecoveryLookaheadTokenLimit: p.errorRecoveryTokenLookaheadLimit,
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populateMacroCalls: p.populateMacroCalls,
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}
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buf, ok := source.(runes.Buffer)
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if !ok {
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buf = runes.NewBuffer(source.Content())
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}
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var e *exprpb.Expr
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if buf.Len() > p.expressionSizeCodePointLimit {
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e = impl.reportError(common.NoLocation,
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"expression code point size exceeds limit: size: %d, limit %d",
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buf.Len(), p.expressionSizeCodePointLimit)
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} else {
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e = impl.parse(buf, source.Description())
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}
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return &exprpb.ParsedExpr{
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Expr: e,
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SourceInfo: impl.helper.getSourceInfo(),
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}, impl.errors.Errors
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}
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// reservedIds are not legal to use as variables. We exclude them post-parse, as they *are* valid
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// field names for protos, and it would complicate the grammar to distinguish the cases.
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var reservedIds = map[string]struct{}{
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"as": {},
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"break": {},
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"const": {},
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"continue": {},
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"else": {},
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"false": {},
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"for": {},
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"function": {},
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"if": {},
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"import": {},
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"in": {},
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"let": {},
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"loop": {},
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"package": {},
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"namespace": {},
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"null": {},
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"return": {},
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"true": {},
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"var": {},
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"void": {},
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"while": {},
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}
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// Parse converts a source input a parsed expression.
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// This function calls ParseWithMacros with AllMacros.
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//
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// Deprecated: Use NewParser().Parse() instead.
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func Parse(source common.Source) (*exprpb.ParsedExpr, *common.Errors) {
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return mustNewParser(Macros(AllMacros...)).Parse(source)
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}
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type recursionError struct {
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message string
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}
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// Error implements error.
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func (re *recursionError) Error() string {
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return re.message
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}
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var _ error = &recursionError{}
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type recursionListener struct {
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maxDepth int
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ruleTypeDepth map[int]*int
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}
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func (rl *recursionListener) VisitTerminal(node antlr.TerminalNode) {}
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func (rl *recursionListener) VisitErrorNode(node antlr.ErrorNode) {}
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func (rl *recursionListener) EnterEveryRule(ctx antlr.ParserRuleContext) {
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if ctx == nil {
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return
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}
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ruleIndex := ctx.GetRuleIndex()
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depth, found := rl.ruleTypeDepth[ruleIndex]
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if !found {
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var counter = 1
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rl.ruleTypeDepth[ruleIndex] = &counter
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depth = &counter
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} else {
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*depth++
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}
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if *depth >= rl.maxDepth {
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panic(&recursionError{
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message: fmt.Sprintf("expression recursion limit exceeded: %d", rl.maxDepth),
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})
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}
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}
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func (rl *recursionListener) ExitEveryRule(ctx antlr.ParserRuleContext) {
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if ctx == nil {
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return
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}
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ruleIndex := ctx.GetRuleIndex()
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if depth, found := rl.ruleTypeDepth[ruleIndex]; found && *depth > 0 {
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*depth--
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}
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}
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var _ antlr.ParseTreeListener = &recursionListener{}
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type recoveryLimitError struct {
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message string
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}
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// Error implements error.
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func (rl *recoveryLimitError) Error() string {
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return rl.message
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}
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type lookaheadLimitError struct {
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message string
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}
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func (ll *lookaheadLimitError) Error() string {
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return ll.message
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}
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var _ error = &recoveryLimitError{}
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type recoveryLimitErrorStrategy struct {
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*antlr.DefaultErrorStrategy
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errorRecoveryLimit int
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errorRecoveryTokenLookaheadLimit int
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recoveryAttempts int
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}
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type lookaheadConsumer struct {
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antlr.Parser
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errorRecoveryTokenLookaheadLimit int
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lookaheadAttempts int
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}
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func (lc *lookaheadConsumer) Consume() antlr.Token {
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if lc.lookaheadAttempts >= lc.errorRecoveryTokenLookaheadLimit {
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panic(&lookaheadLimitError{
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message: fmt.Sprintf("error recovery token lookahead limit exceeded: %d", lc.errorRecoveryTokenLookaheadLimit),
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})
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}
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lc.lookaheadAttempts++
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return lc.Parser.Consume()
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}
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func (rl *recoveryLimitErrorStrategy) Recover(recognizer antlr.Parser, e antlr.RecognitionException) {
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rl.checkAttempts(recognizer)
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lc := &lookaheadConsumer{Parser: recognizer, errorRecoveryTokenLookaheadLimit: rl.errorRecoveryTokenLookaheadLimit}
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rl.DefaultErrorStrategy.Recover(lc, e)
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}
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func (rl *recoveryLimitErrorStrategy) RecoverInline(recognizer antlr.Parser) antlr.Token {
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rl.checkAttempts(recognizer)
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lc := &lookaheadConsumer{Parser: recognizer, errorRecoveryTokenLookaheadLimit: rl.errorRecoveryTokenLookaheadLimit}
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return rl.DefaultErrorStrategy.RecoverInline(lc)
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}
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func (rl *recoveryLimitErrorStrategy) checkAttempts(recognizer antlr.Parser) {
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if rl.recoveryAttempts == rl.errorRecoveryLimit {
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rl.recoveryAttempts++
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msg := fmt.Sprintf("error recovery attempt limit exceeded: %d", rl.errorRecoveryLimit)
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recognizer.NotifyErrorListeners(msg, nil, nil)
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panic(&recoveryLimitError{
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message: msg,
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})
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}
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rl.recoveryAttempts++
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}
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var _ antlr.ErrorStrategy = &recoveryLimitErrorStrategy{}
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type parser struct {
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gen.BaseCELVisitor
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errors *parseErrors
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helper *parserHelper
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macros map[string]Macro
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recursionDepth int
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maxRecursionDepth int
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errorRecoveryLimit int
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errorRecoveryLookaheadTokenLimit int
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populateMacroCalls bool
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}
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var (
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_ gen.CELVisitor = (*parser)(nil)
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lexerPool *sync.Pool = &sync.Pool{
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New: func() interface{} {
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l := gen.NewCELLexer(nil)
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l.RemoveErrorListeners()
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return l
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},
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}
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parserPool *sync.Pool = &sync.Pool{
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New: func() interface{} {
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p := gen.NewCELParser(nil)
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p.RemoveErrorListeners()
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return p
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},
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}
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)
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func (p *parser) parse(expr runes.Buffer, desc string) *exprpb.Expr {
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// TODO: get rid of these pools once https://github.com/antlr/antlr4/pull/3571 is in a release
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lexer := lexerPool.Get().(*gen.CELLexer)
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prsr := parserPool.Get().(*gen.CELParser)
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// Unfortunately ANTLR Go runtime is missing (*antlr.BaseParser).RemoveParseListeners, so this is
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// good enough until that is exported.
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prsrListener := &recursionListener{
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maxDepth: p.maxRecursionDepth,
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ruleTypeDepth: map[int]*int{},
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}
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defer func() {
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// Reset the lexer and parser before putting them back in the pool.
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lexer.RemoveErrorListeners()
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prsr.RemoveParseListener(prsrListener)
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prsr.RemoveErrorListeners()
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lexer.SetInputStream(nil)
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prsr.SetInputStream(nil)
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lexerPool.Put(lexer)
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parserPool.Put(prsr)
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}()
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lexer.SetInputStream(newCharStream(expr, desc))
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prsr.SetInputStream(antlr.NewCommonTokenStream(lexer, 0))
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lexer.AddErrorListener(p)
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prsr.AddErrorListener(p)
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prsr.AddParseListener(prsrListener)
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prsr.SetErrorHandler(&recoveryLimitErrorStrategy{
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DefaultErrorStrategy: antlr.NewDefaultErrorStrategy(),
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errorRecoveryLimit: p.errorRecoveryLimit,
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errorRecoveryTokenLookaheadLimit: p.errorRecoveryLookaheadTokenLimit,
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})
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defer func() {
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if val := recover(); val != nil {
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switch err := val.(type) {
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case *lookaheadLimitError:
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p.errors.ReportError(common.NoLocation, err.Error())
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case *recursionError:
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p.errors.ReportError(common.NoLocation, err.Error())
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case *recoveryLimitError:
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// do nothing, listeners already notified and error reported.
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default:
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panic(val)
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}
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}
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}()
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return p.Visit(prsr.Start()).(*exprpb.Expr)
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}
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// Visitor implementations.
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func (p *parser) Visit(tree antlr.ParseTree) interface{} {
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p.recursionDepth++
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if p.recursionDepth > p.maxRecursionDepth {
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panic(&recursionError{message: "max recursion depth exceeded"})
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}
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defer func() {
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p.recursionDepth--
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}()
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switch tree.(type) {
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case *gen.StartContext:
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return p.VisitStart(tree.(*gen.StartContext))
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case *gen.ExprContext:
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return p.VisitExpr(tree.(*gen.ExprContext))
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case *gen.ConditionalAndContext:
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return p.VisitConditionalAnd(tree.(*gen.ConditionalAndContext))
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case *gen.ConditionalOrContext:
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return p.VisitConditionalOr(tree.(*gen.ConditionalOrContext))
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case *gen.RelationContext:
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return p.VisitRelation(tree.(*gen.RelationContext))
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case *gen.CalcContext:
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return p.VisitCalc(tree.(*gen.CalcContext))
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case *gen.LogicalNotContext:
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return p.VisitLogicalNot(tree.(*gen.LogicalNotContext))
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case *gen.MemberExprContext:
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return p.VisitMemberExpr(tree.(*gen.MemberExprContext))
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case *gen.PrimaryExprContext:
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return p.VisitPrimaryExpr(tree.(*gen.PrimaryExprContext))
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case *gen.SelectOrCallContext:
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|
|
return p.VisitSelectOrCall(tree.(*gen.SelectOrCallContext))
|
||
|
|
case *gen.MapInitializerListContext:
|
||
|
|
return p.VisitMapInitializerList(tree.(*gen.MapInitializerListContext))
|
||
|
|
case *gen.NegateContext:
|
||
|
|
return p.VisitNegate(tree.(*gen.NegateContext))
|
||
|
|
case *gen.IndexContext:
|
||
|
|
return p.VisitIndex(tree.(*gen.IndexContext))
|
||
|
|
case *gen.UnaryContext:
|
||
|
|
return p.VisitUnary(tree.(*gen.UnaryContext))
|
||
|
|
case *gen.CreateListContext:
|
||
|
|
return p.VisitCreateList(tree.(*gen.CreateListContext))
|
||
|
|
case *gen.CreateMessageContext:
|
||
|
|
return p.VisitCreateMessage(tree.(*gen.CreateMessageContext))
|
||
|
|
case *gen.CreateStructContext:
|
||
|
|
return p.VisitCreateStruct(tree.(*gen.CreateStructContext))
|
||
|
|
}
|
||
|
|
|
||
|
|
// Report at least one error if the parser reaches an unknown parse element.
|
||
|
|
// Typically, this happens if the parser has already encountered a syntax error elsewhere.
|
||
|
|
if len(p.errors.GetErrors()) == 0 {
|
||
|
|
txt := "<<nil>>"
|
||
|
|
if tree != nil {
|
||
|
|
txt = fmt.Sprintf("<<%T>>", tree)
|
||
|
|
}
|
||
|
|
return p.reportError(common.NoLocation, "unknown parse element encountered: %s", txt)
|
||
|
|
}
|
||
|
|
return p.helper.newExpr(common.NoLocation)
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#start.
|
||
|
|
func (p *parser) VisitStart(ctx *gen.StartContext) interface{} {
|
||
|
|
return p.Visit(ctx.Expr())
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#expr.
|
||
|
|
func (p *parser) VisitExpr(ctx *gen.ExprContext) interface{} {
|
||
|
|
result := p.Visit(ctx.GetE()).(*exprpb.Expr)
|
||
|
|
if ctx.GetOp() == nil {
|
||
|
|
return result
|
||
|
|
}
|
||
|
|
opID := p.helper.id(ctx.GetOp())
|
||
|
|
ifTrue := p.Visit(ctx.GetE1()).(*exprpb.Expr)
|
||
|
|
ifFalse := p.Visit(ctx.GetE2()).(*exprpb.Expr)
|
||
|
|
return p.globalCallOrMacro(opID, operators.Conditional, result, ifTrue, ifFalse)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#conditionalOr.
|
||
|
|
func (p *parser) VisitConditionalOr(ctx *gen.ConditionalOrContext) interface{} {
|
||
|
|
result := p.Visit(ctx.GetE()).(*exprpb.Expr)
|
||
|
|
if ctx.GetOps() == nil {
|
||
|
|
return result
|
||
|
|
}
|
||
|
|
b := newBalancer(p.helper, operators.LogicalOr, result)
|
||
|
|
rest := ctx.GetE1()
|
||
|
|
for i, op := range ctx.GetOps() {
|
||
|
|
if i >= len(rest) {
|
||
|
|
return p.reportError(ctx, "unexpected character, wanted '||'")
|
||
|
|
}
|
||
|
|
next := p.Visit(rest[i]).(*exprpb.Expr)
|
||
|
|
opID := p.helper.id(op)
|
||
|
|
b.addTerm(opID, next)
|
||
|
|
}
|
||
|
|
return b.balance()
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#conditionalAnd.
|
||
|
|
func (p *parser) VisitConditionalAnd(ctx *gen.ConditionalAndContext) interface{} {
|
||
|
|
result := p.Visit(ctx.GetE()).(*exprpb.Expr)
|
||
|
|
if ctx.GetOps() == nil {
|
||
|
|
return result
|
||
|
|
}
|
||
|
|
b := newBalancer(p.helper, operators.LogicalAnd, result)
|
||
|
|
rest := ctx.GetE1()
|
||
|
|
for i, op := range ctx.GetOps() {
|
||
|
|
if i >= len(rest) {
|
||
|
|
return p.reportError(ctx, "unexpected character, wanted '&&'")
|
||
|
|
}
|
||
|
|
next := p.Visit(rest[i]).(*exprpb.Expr)
|
||
|
|
opID := p.helper.id(op)
|
||
|
|
b.addTerm(opID, next)
|
||
|
|
}
|
||
|
|
return b.balance()
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#relation.
|
||
|
|
func (p *parser) VisitRelation(ctx *gen.RelationContext) interface{} {
|
||
|
|
if ctx.Calc() != nil {
|
||
|
|
return p.Visit(ctx.Calc())
|
||
|
|
}
|
||
|
|
opText := ""
|
||
|
|
if ctx.GetOp() != nil {
|
||
|
|
opText = ctx.GetOp().GetText()
|
||
|
|
}
|
||
|
|
if op, found := operators.Find(opText); found {
|
||
|
|
lhs := p.Visit(ctx.Relation(0)).(*exprpb.Expr)
|
||
|
|
opID := p.helper.id(ctx.GetOp())
|
||
|
|
rhs := p.Visit(ctx.Relation(1)).(*exprpb.Expr)
|
||
|
|
return p.globalCallOrMacro(opID, op, lhs, rhs)
|
||
|
|
}
|
||
|
|
return p.reportError(ctx, "operator not found")
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#calc.
|
||
|
|
func (p *parser) VisitCalc(ctx *gen.CalcContext) interface{} {
|
||
|
|
if ctx.Unary() != nil {
|
||
|
|
return p.Visit(ctx.Unary())
|
||
|
|
}
|
||
|
|
opText := ""
|
||
|
|
if ctx.GetOp() != nil {
|
||
|
|
opText = ctx.GetOp().GetText()
|
||
|
|
}
|
||
|
|
if op, found := operators.Find(opText); found {
|
||
|
|
lhs := p.Visit(ctx.Calc(0)).(*exprpb.Expr)
|
||
|
|
opID := p.helper.id(ctx.GetOp())
|
||
|
|
rhs := p.Visit(ctx.Calc(1)).(*exprpb.Expr)
|
||
|
|
return p.globalCallOrMacro(opID, op, lhs, rhs)
|
||
|
|
}
|
||
|
|
return p.reportError(ctx, "operator not found")
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) VisitUnary(ctx *gen.UnaryContext) interface{} {
|
||
|
|
return p.helper.newLiteralString(ctx, "<<error>>")
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#MemberExpr.
|
||
|
|
func (p *parser) VisitMemberExpr(ctx *gen.MemberExprContext) interface{} {
|
||
|
|
switch ctx.Member().(type) {
|
||
|
|
case *gen.PrimaryExprContext:
|
||
|
|
return p.VisitPrimaryExpr(ctx.Member().(*gen.PrimaryExprContext))
|
||
|
|
case *gen.SelectOrCallContext:
|
||
|
|
return p.VisitSelectOrCall(ctx.Member().(*gen.SelectOrCallContext))
|
||
|
|
case *gen.IndexContext:
|
||
|
|
return p.VisitIndex(ctx.Member().(*gen.IndexContext))
|
||
|
|
case *gen.CreateMessageContext:
|
||
|
|
return p.VisitCreateMessage(ctx.Member().(*gen.CreateMessageContext))
|
||
|
|
}
|
||
|
|
return p.reportError(ctx, "unsupported simple expression")
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#LogicalNot.
|
||
|
|
func (p *parser) VisitLogicalNot(ctx *gen.LogicalNotContext) interface{} {
|
||
|
|
if len(ctx.GetOps())%2 == 0 {
|
||
|
|
return p.Visit(ctx.Member())
|
||
|
|
}
|
||
|
|
opID := p.helper.id(ctx.GetOps()[0])
|
||
|
|
target := p.Visit(ctx.Member()).(*exprpb.Expr)
|
||
|
|
return p.globalCallOrMacro(opID, operators.LogicalNot, target)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) VisitNegate(ctx *gen.NegateContext) interface{} {
|
||
|
|
if len(ctx.GetOps())%2 == 0 {
|
||
|
|
return p.Visit(ctx.Member())
|
||
|
|
}
|
||
|
|
opID := p.helper.id(ctx.GetOps()[0])
|
||
|
|
target := p.Visit(ctx.Member()).(*exprpb.Expr)
|
||
|
|
return p.globalCallOrMacro(opID, operators.Negate, target)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#SelectOrCall.
|
||
|
|
func (p *parser) VisitSelectOrCall(ctx *gen.SelectOrCallContext) interface{} {
|
||
|
|
operand := p.Visit(ctx.Member()).(*exprpb.Expr)
|
||
|
|
// Handle the error case where no valid identifier is specified.
|
||
|
|
if ctx.GetId() == nil {
|
||
|
|
return p.helper.newExpr(ctx)
|
||
|
|
}
|
||
|
|
id := ctx.GetId().GetText()
|
||
|
|
if ctx.GetOpen() != nil {
|
||
|
|
opID := p.helper.id(ctx.GetOpen())
|
||
|
|
return p.receiverCallOrMacro(opID, id, operand, p.visitList(ctx.GetArgs())...)
|
||
|
|
}
|
||
|
|
return p.helper.newSelect(ctx.GetOp(), operand, id)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#PrimaryExpr.
|
||
|
|
func (p *parser) VisitPrimaryExpr(ctx *gen.PrimaryExprContext) interface{} {
|
||
|
|
switch ctx.Primary().(type) {
|
||
|
|
case *gen.NestedContext:
|
||
|
|
return p.VisitNested(ctx.Primary().(*gen.NestedContext))
|
||
|
|
case *gen.IdentOrGlobalCallContext:
|
||
|
|
return p.VisitIdentOrGlobalCall(ctx.Primary().(*gen.IdentOrGlobalCallContext))
|
||
|
|
case *gen.CreateListContext:
|
||
|
|
return p.VisitCreateList(ctx.Primary().(*gen.CreateListContext))
|
||
|
|
case *gen.CreateStructContext:
|
||
|
|
return p.VisitCreateStruct(ctx.Primary().(*gen.CreateStructContext))
|
||
|
|
case *gen.ConstantLiteralContext:
|
||
|
|
return p.VisitConstantLiteral(ctx.Primary().(*gen.ConstantLiteralContext))
|
||
|
|
}
|
||
|
|
|
||
|
|
return p.reportError(ctx, "invalid primary expression")
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#Index.
|
||
|
|
func (p *parser) VisitIndex(ctx *gen.IndexContext) interface{} {
|
||
|
|
target := p.Visit(ctx.Member()).(*exprpb.Expr)
|
||
|
|
opID := p.helper.id(ctx.GetOp())
|
||
|
|
index := p.Visit(ctx.GetIndex()).(*exprpb.Expr)
|
||
|
|
return p.globalCallOrMacro(opID, operators.Index, target, index)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#CreateMessage.
|
||
|
|
func (p *parser) VisitCreateMessage(ctx *gen.CreateMessageContext) interface{} {
|
||
|
|
target := p.Visit(ctx.Member()).(*exprpb.Expr)
|
||
|
|
objID := p.helper.id(ctx.GetOp())
|
||
|
|
if messageName, found := p.extractQualifiedName(target); found {
|
||
|
|
entries := p.VisitIFieldInitializerList(ctx.GetEntries()).([]*exprpb.Expr_CreateStruct_Entry)
|
||
|
|
return p.helper.newObject(objID, messageName, entries...)
|
||
|
|
}
|
||
|
|
return p.helper.newExpr(objID)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree of field initializers.
|
||
|
|
func (p *parser) VisitIFieldInitializerList(ctx gen.IFieldInitializerListContext) interface{} {
|
||
|
|
if ctx == nil || ctx.GetFields() == nil {
|
||
|
|
// This is the result of a syntax error handled elswhere, return empty.
|
||
|
|
return []*exprpb.Expr_CreateStruct_Entry{}
|
||
|
|
}
|
||
|
|
|
||
|
|
result := make([]*exprpb.Expr_CreateStruct_Entry, len(ctx.GetFields()))
|
||
|
|
cols := ctx.GetCols()
|
||
|
|
vals := ctx.GetValues()
|
||
|
|
for i, f := range ctx.GetFields() {
|
||
|
|
if i >= len(cols) || i >= len(vals) {
|
||
|
|
// This is the result of a syntax error detected elsewhere.
|
||
|
|
return []*exprpb.Expr_CreateStruct_Entry{}
|
||
|
|
}
|
||
|
|
initID := p.helper.id(cols[i])
|
||
|
|
value := p.Visit(vals[i]).(*exprpb.Expr)
|
||
|
|
field := p.helper.newObjectField(initID, f.GetText(), value)
|
||
|
|
result[i] = field
|
||
|
|
}
|
||
|
|
return result
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#IdentOrGlobalCall.
|
||
|
|
func (p *parser) VisitIdentOrGlobalCall(ctx *gen.IdentOrGlobalCallContext) interface{} {
|
||
|
|
identName := ""
|
||
|
|
if ctx.GetLeadingDot() != nil {
|
||
|
|
identName = "."
|
||
|
|
}
|
||
|
|
// Handle the error case where no valid identifier is specified.
|
||
|
|
if ctx.GetId() == nil {
|
||
|
|
return p.helper.newExpr(ctx)
|
||
|
|
}
|
||
|
|
// Handle reserved identifiers.
|
||
|
|
id := ctx.GetId().GetText()
|
||
|
|
if _, ok := reservedIds[id]; ok {
|
||
|
|
return p.reportError(ctx, "reserved identifier: %s", id)
|
||
|
|
}
|
||
|
|
identName += id
|
||
|
|
if ctx.GetOp() != nil {
|
||
|
|
opID := p.helper.id(ctx.GetOp())
|
||
|
|
return p.globalCallOrMacro(opID, identName, p.visitList(ctx.GetArgs())...)
|
||
|
|
}
|
||
|
|
return p.helper.newIdent(ctx.GetId(), identName)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#Nested.
|
||
|
|
func (p *parser) VisitNested(ctx *gen.NestedContext) interface{} {
|
||
|
|
return p.Visit(ctx.GetE())
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#CreateList.
|
||
|
|
func (p *parser) VisitCreateList(ctx *gen.CreateListContext) interface{} {
|
||
|
|
listID := p.helper.id(ctx.GetOp())
|
||
|
|
return p.helper.newList(listID, p.visitList(ctx.GetElems())...)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#CreateStruct.
|
||
|
|
func (p *parser) VisitCreateStruct(ctx *gen.CreateStructContext) interface{} {
|
||
|
|
structID := p.helper.id(ctx.GetOp())
|
||
|
|
entries := []*exprpb.Expr_CreateStruct_Entry{}
|
||
|
|
if ctx.GetEntries() != nil {
|
||
|
|
entries = p.Visit(ctx.GetEntries()).([]*exprpb.Expr_CreateStruct_Entry)
|
||
|
|
}
|
||
|
|
return p.helper.newMap(structID, entries...)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#ConstantLiteral.
|
||
|
|
func (p *parser) VisitConstantLiteral(ctx *gen.ConstantLiteralContext) interface{} {
|
||
|
|
switch ctx.Literal().(type) {
|
||
|
|
case *gen.IntContext:
|
||
|
|
return p.VisitInt(ctx.Literal().(*gen.IntContext))
|
||
|
|
case *gen.UintContext:
|
||
|
|
return p.VisitUint(ctx.Literal().(*gen.UintContext))
|
||
|
|
case *gen.DoubleContext:
|
||
|
|
return p.VisitDouble(ctx.Literal().(*gen.DoubleContext))
|
||
|
|
case *gen.StringContext:
|
||
|
|
return p.VisitString(ctx.Literal().(*gen.StringContext))
|
||
|
|
case *gen.BytesContext:
|
||
|
|
return p.VisitBytes(ctx.Literal().(*gen.BytesContext))
|
||
|
|
case *gen.BoolFalseContext:
|
||
|
|
return p.VisitBoolFalse(ctx.Literal().(*gen.BoolFalseContext))
|
||
|
|
case *gen.BoolTrueContext:
|
||
|
|
return p.VisitBoolTrue(ctx.Literal().(*gen.BoolTrueContext))
|
||
|
|
case *gen.NullContext:
|
||
|
|
return p.VisitNull(ctx.Literal().(*gen.NullContext))
|
||
|
|
}
|
||
|
|
return p.reportError(ctx, "invalid literal")
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#mapInitializerList.
|
||
|
|
func (p *parser) VisitMapInitializerList(ctx *gen.MapInitializerListContext) interface{} {
|
||
|
|
if ctx == nil || ctx.GetKeys() == nil {
|
||
|
|
// This is the result of a syntax error handled elswhere, return empty.
|
||
|
|
return []*exprpb.Expr_CreateStruct_Entry{}
|
||
|
|
}
|
||
|
|
|
||
|
|
result := make([]*exprpb.Expr_CreateStruct_Entry, len(ctx.GetCols()))
|
||
|
|
keys := ctx.GetKeys()
|
||
|
|
vals := ctx.GetValues()
|
||
|
|
for i, col := range ctx.GetCols() {
|
||
|
|
colID := p.helper.id(col)
|
||
|
|
if i >= len(keys) || i >= len(vals) {
|
||
|
|
// This is the result of a syntax error detected elsewhere.
|
||
|
|
return []*exprpb.Expr_CreateStruct_Entry{}
|
||
|
|
}
|
||
|
|
key := p.Visit(keys[i]).(*exprpb.Expr)
|
||
|
|
value := p.Visit(vals[i]).(*exprpb.Expr)
|
||
|
|
entry := p.helper.newMapEntry(colID, key, value)
|
||
|
|
result[i] = entry
|
||
|
|
}
|
||
|
|
return result
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#Int.
|
||
|
|
func (p *parser) VisitInt(ctx *gen.IntContext) interface{} {
|
||
|
|
text := ctx.GetTok().GetText()
|
||
|
|
base := 10
|
||
|
|
if strings.HasPrefix(text, "0x") {
|
||
|
|
base = 16
|
||
|
|
text = text[2:]
|
||
|
|
}
|
||
|
|
if ctx.GetSign() != nil {
|
||
|
|
text = ctx.GetSign().GetText() + text
|
||
|
|
}
|
||
|
|
i, err := strconv.ParseInt(text, base, 64)
|
||
|
|
if err != nil {
|
||
|
|
return p.reportError(ctx, "invalid int literal")
|
||
|
|
}
|
||
|
|
return p.helper.newLiteralInt(ctx, i)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#Uint.
|
||
|
|
func (p *parser) VisitUint(ctx *gen.UintContext) interface{} {
|
||
|
|
text := ctx.GetTok().GetText()
|
||
|
|
// trim the 'u' designator included in the uint literal.
|
||
|
|
text = text[:len(text)-1]
|
||
|
|
base := 10
|
||
|
|
if strings.HasPrefix(text, "0x") {
|
||
|
|
base = 16
|
||
|
|
text = text[2:]
|
||
|
|
}
|
||
|
|
i, err := strconv.ParseUint(text, base, 64)
|
||
|
|
if err != nil {
|
||
|
|
return p.reportError(ctx, "invalid uint literal")
|
||
|
|
}
|
||
|
|
return p.helper.newLiteralUint(ctx, i)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#Double.
|
||
|
|
func (p *parser) VisitDouble(ctx *gen.DoubleContext) interface{} {
|
||
|
|
txt := ctx.GetTok().GetText()
|
||
|
|
if ctx.GetSign() != nil {
|
||
|
|
txt = ctx.GetSign().GetText() + txt
|
||
|
|
}
|
||
|
|
f, err := strconv.ParseFloat(txt, 64)
|
||
|
|
if err != nil {
|
||
|
|
return p.reportError(ctx, "invalid double literal")
|
||
|
|
}
|
||
|
|
return p.helper.newLiteralDouble(ctx, f)
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#String.
|
||
|
|
func (p *parser) VisitString(ctx *gen.StringContext) interface{} {
|
||
|
|
s := p.unquote(ctx, ctx.GetText(), false)
|
||
|
|
return p.helper.newLiteralString(ctx, s)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#Bytes.
|
||
|
|
func (p *parser) VisitBytes(ctx *gen.BytesContext) interface{} {
|
||
|
|
b := []byte(p.unquote(ctx, ctx.GetTok().GetText()[1:], true))
|
||
|
|
return p.helper.newLiteralBytes(ctx, b)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#BoolTrue.
|
||
|
|
func (p *parser) VisitBoolTrue(ctx *gen.BoolTrueContext) interface{} {
|
||
|
|
return p.helper.newLiteralBool(ctx, true)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#BoolFalse.
|
||
|
|
func (p *parser) VisitBoolFalse(ctx *gen.BoolFalseContext) interface{} {
|
||
|
|
return p.helper.newLiteralBool(ctx, false)
|
||
|
|
}
|
||
|
|
|
||
|
|
// Visit a parse tree produced by CELParser#Null.
|
||
|
|
func (p *parser) VisitNull(ctx *gen.NullContext) interface{} {
|
||
|
|
return p.helper.newLiteral(ctx,
|
||
|
|
&exprpb.Constant{
|
||
|
|
ConstantKind: &exprpb.Constant_NullValue{
|
||
|
|
NullValue: structpb.NullValue_NULL_VALUE}})
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) visitList(ctx gen.IExprListContext) []*exprpb.Expr {
|
||
|
|
if ctx == nil {
|
||
|
|
return []*exprpb.Expr{}
|
||
|
|
}
|
||
|
|
return p.visitSlice(ctx.GetE())
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) visitSlice(expressions []gen.IExprContext) []*exprpb.Expr {
|
||
|
|
if expressions == nil {
|
||
|
|
return []*exprpb.Expr{}
|
||
|
|
}
|
||
|
|
result := make([]*exprpb.Expr, len(expressions))
|
||
|
|
for i, e := range expressions {
|
||
|
|
ex := p.Visit(e).(*exprpb.Expr)
|
||
|
|
result[i] = ex
|
||
|
|
}
|
||
|
|
return result
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) extractQualifiedName(e *exprpb.Expr) (string, bool) {
|
||
|
|
if e == nil {
|
||
|
|
return "", false
|
||
|
|
}
|
||
|
|
switch e.GetExprKind().(type) {
|
||
|
|
case *exprpb.Expr_IdentExpr:
|
||
|
|
return e.GetIdentExpr().GetName(), true
|
||
|
|
case *exprpb.Expr_SelectExpr:
|
||
|
|
s := e.GetSelectExpr()
|
||
|
|
if prefix, found := p.extractQualifiedName(s.GetOperand()); found {
|
||
|
|
return prefix + "." + s.GetField(), true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// TODO: Add a method to Source to get location from character offset.
|
||
|
|
location := p.helper.getLocation(e.GetId())
|
||
|
|
p.reportError(location, "expected a qualified name")
|
||
|
|
return "", false
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) unquote(ctx interface{}, value string, isBytes bool) string {
|
||
|
|
text, err := unescape(value, isBytes)
|
||
|
|
if err != nil {
|
||
|
|
p.reportError(ctx, "%s", err.Error())
|
||
|
|
return value
|
||
|
|
}
|
||
|
|
return text
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) reportError(ctx interface{}, format string, args ...interface{}) *exprpb.Expr {
|
||
|
|
var location common.Location
|
||
|
|
switch ctx.(type) {
|
||
|
|
case common.Location:
|
||
|
|
location = ctx.(common.Location)
|
||
|
|
case antlr.Token, antlr.ParserRuleContext:
|
||
|
|
err := p.helper.newExpr(ctx)
|
||
|
|
location = p.helper.getLocation(err.GetId())
|
||
|
|
}
|
||
|
|
err := p.helper.newExpr(ctx)
|
||
|
|
// Provide arguments to the report error.
|
||
|
|
p.errors.ReportError(location, format, args...)
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// ANTLR Parse listener implementations
|
||
|
|
func (p *parser) SyntaxError(recognizer antlr.Recognizer, offendingSymbol interface{}, line, column int, msg string, e antlr.RecognitionException) {
|
||
|
|
// TODO: Snippet
|
||
|
|
l := p.helper.source.NewLocation(line, column)
|
||
|
|
p.errors.syntaxError(l, msg)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) ReportAmbiguity(recognizer antlr.Parser, dfa *antlr.DFA, startIndex, stopIndex int, exact bool, ambigAlts *antlr.BitSet, configs antlr.ATNConfigSet) {
|
||
|
|
// Intentional
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) ReportAttemptingFullContext(recognizer antlr.Parser, dfa *antlr.DFA, startIndex, stopIndex int, conflictingAlts *antlr.BitSet, configs antlr.ATNConfigSet) {
|
||
|
|
// Intentional
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) ReportContextSensitivity(recognizer antlr.Parser, dfa *antlr.DFA, startIndex, stopIndex, prediction int, configs antlr.ATNConfigSet) {
|
||
|
|
// Intentional
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) globalCallOrMacro(exprID int64, function string, args ...*exprpb.Expr) *exprpb.Expr {
|
||
|
|
if expr, found := p.expandMacro(exprID, function, nil, args...); found {
|
||
|
|
return expr
|
||
|
|
}
|
||
|
|
return p.helper.newGlobalCall(exprID, function, args...)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) receiverCallOrMacro(exprID int64, function string, target *exprpb.Expr, args ...*exprpb.Expr) *exprpb.Expr {
|
||
|
|
if expr, found := p.expandMacro(exprID, function, target, args...); found {
|
||
|
|
return expr
|
||
|
|
}
|
||
|
|
return p.helper.newReceiverCall(exprID, function, target, args...)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (p *parser) expandMacro(exprID int64, function string, target *exprpb.Expr, args ...*exprpb.Expr) (*exprpb.Expr, bool) {
|
||
|
|
macro, found := p.macros[makeMacroKey(function, len(args), target != nil)]
|
||
|
|
if !found {
|
||
|
|
macro, found = p.macros[makeVarArgMacroKey(function, target != nil)]
|
||
|
|
if !found {
|
||
|
|
return nil, false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
eh := exprHelperPool.Get().(*exprHelper)
|
||
|
|
defer exprHelperPool.Put(eh)
|
||
|
|
eh.parserHelper = p.helper
|
||
|
|
eh.id = exprID
|
||
|
|
expr, err := macro.Expander()(eh, target, args)
|
||
|
|
if err != nil {
|
||
|
|
if err.Location != nil {
|
||
|
|
return p.reportError(err.Location, err.Message), true
|
||
|
|
}
|
||
|
|
return p.reportError(p.helper.getLocation(exprID), err.Message), true
|
||
|
|
}
|
||
|
|
if p.populateMacroCalls {
|
||
|
|
p.helper.addMacroCall(expr.GetId(), function, target, args...)
|
||
|
|
}
|
||
|
|
return expr, true
|
||
|
|
}
|