Leon Mika
b51c13dfb1
- Fixed the gaps in conjunctions, disjunctions, and equality operator for expression value evaluation. - Fixed the issue in which '^=' was treated as two separate tokens, it's now a single token.
35 lines
685 B
Go
35 lines
685 B
Go
package modexpr
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import (
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"github.com/alecthomas/participle/v2"
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"github.com/pkg/errors"
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)
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type astExpr struct {
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Attributes []*astAttribute `parser:"@@ (',' @@)*"`
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}
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type astAttribute struct {
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Names *astKeyList `parser:"@@ '='"`
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Value *astLiteralValue `parser:"@@"`
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}
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type astKeyList struct {
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Names []string `parser:"@Ident ('/' @Ident)*"`
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}
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type astLiteralValue struct {
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String string `parser:"@String"`
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}
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var parser = participle.MustBuild[astExpr]()
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func Parse(expr string) (*ModExpr, error) {
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ast, err := parser.ParseString("expr", expr)
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if err != nil {
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return nil, errors.Wrapf(err, "cannot parse expression: '%v'", expr)
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}
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return &ModExpr{ast: ast}, nil
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}
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