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// Fountain is a Markdown-like language for screenplays and the main inspiration for this tool.
// Read more at fountain.io
package fountain
import (
"bufio"
"github.com/lapingvino/lexington/lex"
"io"
"strings"
)
var Scene = []string{"INT", "EXT", "EST", "INT./EXT", "INT/EXT", "EXT/INT", "EXT./INT", "I/E"}
func last(out *lex.Screenplay, i int) *lex.Line {
if len(*out) >= i {
return &(*out)[len(*out)-i]
} else {
line := lex.Line{Type: "empty"}
return &line
}
}
func CheckScene(row string) (bool, string, string) {
var scene bool
row = strings.ToUpper(row)
for _, prefix := range Scene {
if strings.HasPrefix(row, prefix+" ") ||
strings.HasPrefix(row, prefix+".") {
scene = true
}
}
if strings.HasPrefix(row, ".") {
row = row[1:]
scene = true
}
return scene, "scene", row
}
func CheckCrow(row string) (bool, string, string) {
var crow bool
var el string
row = strings.ToUpper(row)
if strings.HasPrefix(row, ">") || strings.HasSuffix(row, " TO:") {
crow = true
el = "trans"
}
if strings.HasPrefix(row, ">") && strings.HasSuffix(row, "<") {
el = "center"
}
return crow, el, strings.Trim(row, ">< ")
}
func CheckEqual(row string) (bool, string, string) {
var equal bool
var el string
if strings.HasPrefix(row, "=") {
equal = true
el = "synopse"
}
if len(row) >= 3 && strings.Trim(row, "=") == "" {
el = "newpage"
}
return equal, el, strings.TrimLeft(row, "= ")
}
func CheckSection(row string) (bool, string, string) {
var section bool
if strings.HasPrefix(row, "#") {
section = true
}
return section, "section", row
}
func CheckForce(row string) (bool, string, string) {
var force = true
var ftype string
if len(row) < 1 {
return false, "", ""
}
switch row[0] {
case '@':
ftype = "speaker"
case '~':
ftype = "lyrics"
case '!':
ftype = "action"
default:
force = false
}
if force {
row = row[1:]
}
return force, ftype, row
}
// This is a Fountain parser, trying to be as close as possible to the description
// found at https://fountain.io/syntax but it can be incomplete.
// Over time more and more parts should be configurable here, e.g. INT/EXT translatable to other languages.
func Parse(file io.Reader) (out lex.Screenplay) {
var err error
var titlepage, dialog bool = true, false
var s, titletag string
var toParse []string // Fill with two to avoid out of bounds when backtracking
f := bufio.NewReader(file)
for err == nil {
s, err = f.ReadString('\n')
toParse = append(toParse, s)
}
toParse = append(toParse, "") // Trigger the backtracking also for the last line
for _, row := range toParse {
row = strings.TrimRight(row, "\n\r")
action := "action"
if row == "" {
action = "empty"
if titlepage {
titlepage = false
out = append(out, lex.Line{Type: "newpage"})
continue
}
}
if last(&out, 1).Type != "action" {
last(&out, 1).Contents = strings.TrimSpace(last(&out, 1).Contents)
}
// Backtracking to check for dialog sequence
if dialog {
if row == "" {
dialog = false
action = "empty"
if last(&out, 1).Type == "speaker" {
last(&out, 1).Type = "action"
}
} else {
if row[0] == '(' && row[len(row)-1] == ')' {
action = "paren"
} else {
action = "dialog"
}
}
}
if row == strings.ToUpper(row) && action == "action" {
action = "speaker"
dialog = true
}
checkfuncs := []func(string) (bool, string, string){
CheckScene, // should actually check for empty lines, but doing that creates more problems than it solves
CheckCrow,
CheckEqual,
CheckSection,
CheckForce,
}
for _, checkfunc := range checkfuncs {
check, element, contents := checkfunc(row)
if check {
action = element
row = contents
if action == "speaker" {
dialog = true
}
break
}
}
if titlepage {
if titletag == "" {
out = append(out, lex.Line{Type: "titlepage"})
}
split := strings.SplitN(row, ":", 2)
if len(split) == 2 {
action = split[0]
switch strings.ToLower(action) {
case "title", "credit", "author", "authors":
titletag = "title"
default:
if titletag == "title" {
out = append(out, lex.Line{Type: "metasection"})
}
titletag = action
}
row = strings.TrimSpace(split[1])
if row == "" {
continue
}
} else {
action = titletag
row = strings.TrimSpace(row)
}
}
out = append(out, lex.Line{action, row})
}
return out
}
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