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102 lines
1.9 KiB
Go
102 lines
1.9 KiB
Go
package shell
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import (
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"io"
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"log"
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)
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type Statement struct {
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BaseToken
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}
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func (s *Statement) Evaluate(state State, stdin io.Reader, stdout io.Writer, stderr io.Writer) uint8 {
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if len(s.Tokens()) == 0 {
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return 0
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}
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var command string
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var arguments []string
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for _, token := range s.Tokens() {
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var values []string
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if expand, ok := token.(Expandable); ok {
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values = state.Expand(expand, stdin, stdout)
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} else if _, isWhitespace := token.(*Whitespace); isWhitespace {
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continue
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} else {
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logstr := "shell: Unexpected token: " + token.String()
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log.Println(logstr)
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stderr.Write([]byte(logstr))
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return 2
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}
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if command == "" {
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command = values[0]
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if len(values) > 1 {
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arguments = values[1:]
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}
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continue
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}
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arguments = append(arguments, values...)
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}
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return state.ExecuteCommand(command, arguments, stdin, stdout, stderr)
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}
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type StatementParameters struct{}
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func (p *StatementParameters) SubParsers() []Parser {
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return []Parser{
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&BaseParser{
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parameters: &QuoteParameters{},
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},
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&BaseParser{
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parameters: &SingleQuoteParameters{},
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},
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&BaseParser{
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parameters: &WordParameters{},
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},
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&BaseParser{
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parameters: &DollarParameters{},
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},
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&BaseParser{
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parameters: &PipeParameters{},
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},
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&BaseParser{
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parameters: &SubshellParameters{},
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},
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&BaseParser{
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parameters: &BlockParameters{},
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},
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&BaseParser{
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parameters: &WhitespaceParameters{},
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},
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}
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}
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func (p *StatementParameters) Supports(charsBefore []rune, r rune) bool {
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return true
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}
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func (p *StatementParameters) MakeToken() Token {
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return &Statement{}
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}
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func (p *StatementParameters) ShouldLeave(charsBefore []rune, r rune) bool {
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if r == '\n' || r == ';' || r == ')' {
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return countBackslashSuffixes(charsBefore)%2 == 0
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}
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return false
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}
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func (p *StatementParameters) Leave(i *CharIterator) error {
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if i.Current() == '\n' || i.Current() == ')' {
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return i.Previous()
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}
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return nil
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}
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