58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
package cmdlang
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import (
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"github.com/alecthomas/participle/v2"
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"github.com/alecthomas/participle/v2/lexer"
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"io"
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)
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type astLiteral struct {
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Str *string `parser:"@String"`
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Ident *string `parser:" | @Ident"`
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}
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type astCmdArg struct {
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Literal *astLiteral `parser:"@@"`
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Var *string `parser:"| DOLLAR @Ident"`
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Sub *astPipeline `parser:"| LP @@ RP"`
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}
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type astCmd struct {
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Name string `parser:"@Ident"`
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Args []astCmdArg `parser:"@@*"`
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}
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type astPipeline struct {
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First *astCmd `parser:"@@"`
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Rest []*astCmd `parser:"( PIPE @@ )*"`
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}
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type astStatements struct {
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First *astPipeline `parser:"@@"`
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Rest []*astPipeline `parser:"( (SEMICL | NL)+ @@ )*"` // TODO: also add support for newlines
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}
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type astBlock struct {
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Statements *astStatements `parser:"'{' "`
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}
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var scanner = lexer.MustStateful(lexer.Rules{
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"Root": {
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{"Whitespace", `[ ]`, nil},
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{"NL", `\n\s*`, nil},
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{"String", `"(\\"|[^"])*"`, nil},
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{"DOLLAR", `\$`, nil},
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{"LP", `\(`, nil},
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{"RP", `\)`, nil},
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{"SEMICL", `;`, nil},
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{"PIPE", `\|`, nil},
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{"Ident", `\w+`, nil},
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},
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})
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var parser = participle.MustBuild[astStatements](participle.Lexer(scanner),
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participle.Elide("Whitespace"))
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func parse(r io.Reader) (*astStatements, error) {
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return parser.Parse("test", r)
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}
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