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gitea/vendor/github.com/niklasfasching/go-org/org/block.go
2019-11-05 16:39:03 +08:00

85 lines
2.4 KiB
Go

package org
import (
"regexp"
"strings"
"unicode"
)
type Block struct {
Name string
Parameters []string
Children []Node
}
type Example struct {
Children []Node
}
var exampleLineRegexp = regexp.MustCompile(`^(\s*):(\s(.*)|\s*$)`)
var beginBlockRegexp = regexp.MustCompile(`(?i)^(\s*)#\+BEGIN_(\w+)(.*)`)
var endBlockRegexp = regexp.MustCompile(`(?i)^(\s*)#\+END_(\w+)`)
func lexBlock(line string) (token, bool) {
if m := beginBlockRegexp.FindStringSubmatch(line); m != nil {
return token{"beginBlock", len(m[1]), strings.ToUpper(m[2]), m}, true
} else if m := endBlockRegexp.FindStringSubmatch(line); m != nil {
return token{"endBlock", len(m[1]), strings.ToUpper(m[2]), m}, true
}
return nilToken, false
}
func lexExample(line string) (token, bool) {
if m := exampleLineRegexp.FindStringSubmatch(line); m != nil {
return token{"example", len(m[1]), m[3], m}, true
}
return nilToken, false
}
func isRawTextBlock(name string) bool { return name == "SRC" || name == "EXAMPLE" || name == "EXPORT" }
func (d *Document) parseBlock(i int, parentStop stopFn) (int, Node) {
t, start := d.tokens[i], i
name, parameters := t.content, strings.Fields(t.matches[3])
trim := trimIndentUpTo(d.tokens[i].lvl)
stop := func(d *Document, i int) bool {
return i >= len(d.tokens) || (d.tokens[i].kind == "endBlock" && d.tokens[i].content == name)
}
block, i := Block{name, parameters, nil}, i+1
if isRawTextBlock(name) {
rawText := ""
for ; !stop(d, i); i++ {
rawText += trim(d.tokens[i].matches[0]) + "\n"
}
block.Children = d.parseRawInline(rawText)
} else {
consumed, nodes := d.parseMany(i, stop)
block.Children = nodes
i += consumed
}
if i < len(d.tokens) && d.tokens[i].kind == "endBlock" && d.tokens[i].content == name {
return i + 1 - start, block
}
return 0, nil
}
func (d *Document) parseExample(i int, parentStop stopFn) (int, Node) {
example, start := Example{}, i
for ; !parentStop(d, i) && d.tokens[i].kind == "example"; i++ {
example.Children = append(example.Children, Text{d.tokens[i].content, true})
}
return i - start, example
}
func trimIndentUpTo(max int) func(string) string {
return func(line string) string {
i := 0
for ; i < len(line) && i < max && unicode.IsSpace(rune(line[i])); i++ {
}
return line[i:]
}
}
func (n Example) String() string { return orgWriter.WriteNodesAsString(n) }
func (n Block) String() string { return orgWriter.WriteNodesAsString(n) }