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package org
import (
"math"
"regexp"
"strings"
"unicode"
)
type Block struct {
Name string
Parameters []string
Children []Node
Result Node
}
type Result struct {
Node Node
}
type Example struct {
Children []Node
}
type LatexBlock struct {
Content []Node
}
var exampleLineRegexp = regexp.MustCompile(`^(\s*):(\s(.*)|\s*$)`)
var beginBlockRegexp = regexp.MustCompile(`(?i)^(\s*)#\+BEGIN_(\w+)(.*)`)
var endBlockRegexp = regexp.MustCompile(`(?i)^(\s*)#\+END_(\w+)`)
var beginLatexBlockRegexp = regexp.MustCompile(`(?i)^(\s*)\\begin{([^}]+)}(\s*)$`)
var endLatexBlockRegexp = regexp.MustCompile(`(?i)^(\s*)\\end{([^}]+)}(\s*)$`)
var resultRegexp = regexp.MustCompile(`(?i)^(\s*)#\+RESULTS:`)
var exampleBlockEscapeRegexp = regexp.MustCompile(`(^|\n)([ \t]*),([ \t]*)(\*|,\*|#\+|,#\+)`)
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 lexLatexBlock(line string) (token, bool) {
if m := beginLatexBlockRegexp.FindStringSubmatch(line); m != nil {
return token{"beginLatexBlock", len(m[1]), strings.ToUpper(m[2]), m}, true
} else if m := endLatexBlockRegexp.FindStringSubmatch(line); m != nil {
return token{"endLatexBlock", len(m[1]), strings.ToUpper(m[2]), m}, true
}
return nilToken, false
}
func lexResult(line string) (token, bool) {
if m := resultRegexp.FindStringSubmatch(line); m != nil {
return token{"result", len(m[1]), "", 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, splitParameters(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, nil}, i+1
if isRawTextBlock(name) {
rawText := ""
for ; !stop(d, i); i++ {
rawText += trim(d.tokens[i].matches[0]) + "\n"
}
if name == "EXAMPLE" || (name == "SRC" && len(parameters) >= 1 && parameters[0] == "org") {
rawText = exampleBlockEscapeRegexp.ReplaceAllString(rawText, "$1$2$3$4")
}
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 0, nil
}
if name == "SRC" {
consumed, result := d.parseSrcBlockResult(i+1, parentStop)
block.Result = result
i += consumed
}
return i + 1 - start, block
}
func (d *Document) parseLatexBlock(i int, parentStop stopFn) (int, Node) {
t, start := d.tokens[i], i
name, rawText, trim := t.content, "", trimIndentUpTo(int(math.Max((float64(d.baseLvl)), float64(t.lvl))))
stop := func(d *Document, i int) bool {
return i >= len(d.tokens) || (d.tokens[i].kind == "endLatexBlock" && d.tokens[i].content == name)
}
for ; !stop(d, i); i++ {
rawText += trim(d.tokens[i].matches[0]) + "\n"
}
if i >= len(d.tokens) || d.tokens[i].kind != "endLatexBlock" || d.tokens[i].content != name {
return 0, nil
}
rawText += trim(d.tokens[i].matches[0])
return i + 1 - start, LatexBlock{d.parseRawInline(rawText)}
}
func (d *Document) parseSrcBlockResult(i int, parentStop stopFn) (int, Node) {
start := i
for ; !parentStop(d, i) && d.tokens[i].kind == "text" && d.tokens[i].content == ""; i++ {
}
if parentStop(d, i) || d.tokens[i].kind != "result" {
return 0, nil
}
consumed, result := d.parseResult(i, parentStop)
return (i - start) + consumed, result
}
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 (d *Document) parseResult(i int, parentStop stopFn) (int, Node) {
if i+1 >= len(d.tokens) {
return 0, nil
}
consumed, node := d.parseOne(i+1, parentStop)
return consumed + 1, Result{node}
}
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 splitParameters(s string) []string {
parameters, parts := []string{}, strings.Split(s, " :")
lang, rest := strings.TrimSpace(parts[0]), parts[1:]
if lang != "" {
parameters = append(parameters, lang)
}
for _, p := range rest {
kv := strings.SplitN(p+" ", " ", 2)
parameters = append(parameters, ":"+kv[0], strings.TrimSpace(kv[1]))
}
return parameters
}
func (b Block) ParameterMap() map[string]string {
if len(b.Parameters) == 0 {
return nil
}
m := map[string]string{":lang": b.Parameters[0]}
for i := 1; i+1 < len(b.Parameters); i += 2 {
m[b.Parameters[i]] = b.Parameters[i+1]
}
return m
}
func (n Example) String() string { return String(n) }
func (n Block) String() string { return String(n) }
func (n LatexBlock) String() string { return String(n) }
func (n Result) String() string { return String(n) }
|
