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|
package scl
import (
"bufio"
"fmt"
"io"
"strings"
)
type scannerTree []*scannerLine
type scanner struct {
file string
reader io.Reader
lines scannerTree
}
func newScanner(reader io.Reader, filename ...string) *scanner {
file := "<no file>"
if len(filename) > 0 {
file = filename[0]
}
s := scanner{
file: file,
reader: reader,
lines: make(scannerTree, 0),
}
return &s
}
func (s *scanner) scan() (lines scannerTree, err error) {
// Split to lines
scanner := bufio.NewScanner(s.reader)
scanner.Split(bufio.ScanLines)
lineNumber := 0
rawLines := make(scannerTree, 0)
heredoc := ""
heredocContent := ""
heredocLine := 0
for scanner.Scan() {
lineNumber++
if heredoc != "" {
heredocContent += "\n" + scanner.Text()
if strings.TrimSpace(scanner.Text()) == heredoc {
// HCL requires heredocs to be terminated with a newline
rawLines = append(rawLines, newLine(s.file, lineNumber, 0, heredocContent+"\n"))
heredoc = ""
heredocContent = ""
}
continue
}
text := strings.TrimRight(scanner.Text(), " \t{}")
if text == "" {
continue
}
if matches := heredocMatcher.FindAllStringSubmatch(text, -1); matches != nil {
heredoc = matches[0][1]
heredocContent = text
heredocLine = lineNumber
continue
}
rawLines = append(rawLines, newLine(s.file, lineNumber, 0, text))
}
if heredoc != "" {
return lines, fmt.Errorf("Heredoc '%s' (started line %d) not terminated", heredoc, heredocLine)
}
// Make sure the first line has no indent
if len(rawLines) > 0 {
index := 0
s.indentLines(&index, rawLines, &lines, rawLines[0].content.indent())
}
return
}
func (s *scanner) indentLines(index *int, input scannerTree, output *scannerTree, indent int) {
// Ends when there are no more lines
if *index >= len(input) {
return
}
var lineToAdd *scannerLine
for ; *index < len(input); *index++ {
lineIndent := input[*index].content.indent()
if lineIndent == indent {
lineToAdd = input[*index].branch()
*output = append(*output, lineToAdd)
} else if lineIndent > indent {
s.indentLines(index, input, &lineToAdd.children, lineIndent)
} else if lineIndent < indent {
*index--
return
}
}
return
}
|
