73 lines
1.1 KiB
Go
73 lines
1.1 KiB
Go
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package bash
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import (
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"bufio"
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"io"
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"regexp"
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"strings"
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)
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// Decoder implements parser.Decoder
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type Decoder struct{ reader io.Reader }
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// Decode is the main function of the parser.Decoder interface
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func (d *Decoder) Decode(v interface{}) error {
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// check 'v'
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if v == nil {
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return ErrNullReceiver
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}
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vcast, ok := v.(*File)
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if !ok {
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return ErrInvalidReceiver
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}
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vcast.Lines = make([]*Line, 0)
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r := bufio.NewReader(d.reader)
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n := -1 // line number
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// regexes
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reAssign := regexp.MustCompile(`(?m)^(\s*)([A-Za-z0-9_]+)=([^;]+);?\s*(#.+)?$`)
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eof := false
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for {
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n++
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if eof {
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break
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}
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l := &Line{Type: ANY}
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// 1. read line
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line, err := r.ReadString('\n')
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if err == io.EOF {
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if len(line) > 0 {
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eof = true
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} else {
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break
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}
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} else if err != nil {
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return &LineError{n, err}
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}
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line = strings.Trim(line, "\r\n")
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// 2. ignore empty
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if len(strings.Trim(line, " \t\r\n")) < 1 {
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continue
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}
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// 3. assignment
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match := reAssign.FindStringSubmatch(line)
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if match != nil {
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l.Type = ASSIGNMENT
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l.Components = match[1:]
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}
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// 4. add to file
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vcast.Lines = append(vcast.Lines, l)
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}
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return nil
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}
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