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parse.go
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parse.go
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package mobiledoc
import "fmt"
// Parse will parse the specified raw structure into a document.
func Parse(doc Map) (Document, error) {
// prepare document
d := Document{}
// get version
version, ok := doc["version"].(string)
if !ok {
return d, fmt.Errorf("invalid version")
}
// set version
d.Version = version
// check markups
if value, ok := doc["markups"]; ok && value != nil {
// coerce value
markups, ok := toList(value)
if !ok {
return d, fmt.Errorf("invalid markups definition")
}
// allocate markups
d.Markups = make([]Markup, 0, len(markups))
// parse markups
for _, value := range markups {
// coerce value
markup, ok := toList(value)
if !ok {
return d, fmt.Errorf("invalid markups definition")
}
// parse markup
m, err := parseMarkup(markup)
if err != nil {
return d, err
}
// add markup
d.Markups = append(d.Markups, m)
}
}
// check atoms
if value, ok := doc["atoms"]; ok && value != nil {
// coerce value
atoms, ok := toList(value)
if !ok {
return d, fmt.Errorf("invalid atoms definition")
}
// allocate atoms
d.Atoms = make([]Atom, 0, len(atoms))
// parse atoms
for _, value := range atoms {
// coerce value
atom, ok := toList(value)
if !ok {
return d, fmt.Errorf("invalid atoms definition")
}
// parse atom
a, err := parseAtom(atom)
if err != nil {
return d, err
}
// add atom
d.Atoms = append(d.Atoms, a)
}
}
// check cards
if value, ok := doc["cards"]; ok && value != nil {
// coerce value
cards, ok := toList(value)
if !ok {
return d, fmt.Errorf("invalid cards definition")
}
// allocate cards
d.Cards = make([]Card, 0, len(cards))
// parse cards
for _, value := range cards {
// coerce value
card, ok := toList(value)
if !ok {
return d, fmt.Errorf("invalid cards definition")
}
// parse card
c, err := parseCard(card)
if err != nil {
return d, err
}
// add card
d.Cards = append(d.Cards, c)
}
}
// check sections
if value, ok := doc["sections"]; ok && value != nil {
// coerce value
sections, ok := toList(value)
if !ok {
return d, fmt.Errorf("invalid sections definition")
}
// allocate sections
d.Sections = make([]Section, 0, len(sections))
// parse sections
for _, value := range sections {
// coerce value
section, ok := toList(value)
if !ok {
return d, fmt.Errorf("invalid sections definition")
}
// parse section
s, err := parseSection(section, d.Markups, d.Atoms, d.Cards)
if err != nil {
return d, err
}
// add section
d.Sections = append(d.Sections, s)
}
}
return d, nil
}
func parseMarkup(markup List) (Markup, error) {
// prepare markup
m := Markup{}
// check length
if len(markup) == 0 || len(markup) > 2 {
return m, fmt.Errorf("invalid markup definition")
}
// get tag
tag, ok := markup[0].(string)
if !ok || len(tag) == 0 {
return m, fmt.Errorf("invalid markup tag")
}
// set tag
m.Tag = tag
// return if attributes are missing
if len(markup) == 1 {
return m, nil
}
// get attributes
attributes, ok := toList(markup[1])
if !ok {
return m, fmt.Errorf("invalid markup attributes")
} else if len(attributes)%2 != 0 {
return m, fmt.Errorf("invalid markup attributes")
}
// allocate attributes
m.Attributes = make(Map, len(attributes)/2)
// parse attributes
for i := 0; i < len(attributes); i += 2 {
// get name
name, ok := attributes[i].(string)
if !ok {
return m, fmt.Errorf("invalid markup attributes key")
}
// set attribute
m.Attributes[name] = attributes[i+1]
}
return m, nil
}
func parseAtom(atom List) (Atom, error) {
// prepare atom
a := Atom{}
// check length
if len(atom) != 3 {
return a, fmt.Errorf("invalid atom definition")
}
// get name
name, ok := atom[0].(string)
if !ok {
return a, fmt.Errorf("invalid atom name")
}
// set name
a.Name = name
// get text
text, ok := atom[1].(string)
if !ok {
return a, fmt.Errorf("invalid atom text")
}
// set text
a.Text = text
// get payload
payload, ok := toMap(atom[2])
if !ok {
return a, fmt.Errorf("invalid atom payload")
}
// set payload
a.Payload = payload
return a, nil
}
func parseCard(card List) (Card, error) {
// prepare card
c := Card{}
// check length
if len(card) != 2 {
return c, fmt.Errorf("invalid card definition")
}
// get name
name, ok := card[0].(string)
if !ok {
return c, fmt.Errorf("invalid card name")
}
// set name
c.Name = name
// get payload
payload, ok := toMap(card[1])
if !ok {
return c, fmt.Errorf("invalid card payload")
}
// set payload
c.Payload = payload
return c, nil
}
func parseSection(section List, markups []Markup, atoms []Atom, cards []Card) (Section, error) {
// prepare section
s := Section{}
// check length
if len(section) == 0 {
return s, fmt.Errorf("invalid section definition")
}
// get section type
typ, ok := toInt(section[0])
if !ok {
return s, fmt.Errorf("invalid section type")
}
// parse section
switch SectionType(typ) {
case MarkupSection:
return parseMarkupSection(section, markups, atoms)
case ImageSection:
return parseImageSection(section)
case ListSection:
return parseListSection(section, markups, atoms)
case CardSection:
return parseCardSection(section, cards)
default:
return s, fmt.Errorf("invalid section type")
}
}
func parseMarkupSection(section List, markups []Markup, atoms []Atom) (Section, error) {
// prepare section
s := Section{Type: MarkupSection}
// check length
if len(section) != 3 {
return s, fmt.Errorf("invalid markup section definition")
}
// get tag
tag, ok := section[1].(string)
if !ok {
return s, fmt.Errorf("invalid markup section tag")
}
// set tag
s.Tag = tag
// get items
items, ok := toList(section[2])
if !ok {
return s, fmt.Errorf("invalid markup section items")
}
// prepare open markup counter
openMarkups := 0
// prepare vars
var err error
var m Marker
// allocate markers
s.Markers = make([]Marker, 0, len(items))
// parse markers
for _, value := range items {
// coerce value
marker, ok := toList(value)
if !ok {
return s, fmt.Errorf("invalid markup section marker definition")
}
// parse marker
m, openMarkups, err = parseMarker(marker, markups, atoms, openMarkups)
if err != nil {
return s, err
}
// add marker
s.Markers = append(s.Markers, m)
}
return s, nil
}
func parseImageSection(image List) (Section, error) {
// prepare section
s := Section{Type: ImageSection}
// check length
if len(image) != 2 {
return s, fmt.Errorf("invalid image section definition")
}
// get source
source, ok := image[1].(string)
if !ok {
return s, fmt.Errorf("invalid image section source")
}
// set source
s.Source = source
return s, nil
}
func parseListSection(list List, markups []Markup, atoms []Atom) (Section, error) {
// prepare section
s := Section{Type: ListSection}
// check length
if len(list) != 3 {
return s, fmt.Errorf("invalid list section definition")
}
// get tag
tag, ok := list[1].(string)
if !ok {
return s, fmt.Errorf("invalid list section tag")
}
// set tag
s.Tag = tag
// get items
items, ok := toList(list[2])
if !ok {
return s, fmt.Errorf("invalid list section items")
}
// allocate items
s.Items = make([][]Marker, 0, len(items))
// parse items
for _, value := range items {
// coerce value
item, ok := toList(value)
if !ok {
return s, fmt.Errorf("invalid list section item")
}
// prepare open markup counter
openMarkups := 0
// prepare vars
var err error
var m Marker
// allocate markers
list := make([]Marker, 0, len(item))
// parse markers
for _, value := range item {
// coerce value
marker, ok := toList(value)
if !ok {
return s, fmt.Errorf("invalid list section item marker")
}
// parse marker
m, openMarkups, err = parseMarker(marker, markups, atoms, openMarkups)
if err != nil {
return s, err
}
// add marker
list = append(list, m)
}
// add list
s.Items = append(s.Items, list)
}
return s, nil
}
func parseCardSection(card List, cards []Card) (Section, error) {
// prepare card
s := Section{Type: CardSection}
// check length
if len(card) != 2 {
return s, fmt.Errorf("invalid card section definition")
}
// get index
index, ok := toInt(card[1])
if !ok {
return s, fmt.Errorf("invalid card section index")
}
// check index
if index >= len(cards) {
return s, fmt.Errorf("invalid card section index")
}
// set card
s.Card = &cards[index]
return s, nil
}
func parseMarker(marker List, markups []Markup, atoms []Atom, openMarkups int) (Marker, int, error) {
// prepare marker
m := Marker{}
// check length
if len(marker) != 4 {
return m, 0, fmt.Errorf("invalid marker definition")
}
// get marker type
typ, ok := toInt(marker[0])
if !ok {
return m, 0, fmt.Errorf("invalid marker type")
}
// check marker type
markerType := MarkerType(typ)
if markerType != TextMarker && markerType != AtomMarker {
return m, 0, fmt.Errorf("invalid marker type")
}
// set type
m.Type = markerType
// get opened markups
openedMarkups, ok := toList(marker[1])
if !ok {
return m, 0, fmt.Errorf("invalid marker opened markups")
}
// allocate open markups
if len(openedMarkups) > 0 {
m.OpenMarkups = make([]*Markup, 0, len(openedMarkups))
}
// parse opened markups
for _, value := range openedMarkups {
// coerce value
index, ok := toInt(value)
if !ok {
return m, 0, fmt.Errorf("invalid marker markup index")
}
// check index
if index >= len(markups) {
return m, 0, fmt.Errorf("invalid marker markup index")
}
// add markup
m.OpenMarkups = append(m.OpenMarkups, &markups[index])
// increment counter
openMarkups++
}
// get closed markups
closedMarkups, ok := toInt(marker[2])
if !ok {
return m, 0, fmt.Errorf("invalid marker closed markup")
}
// decrement counter
openMarkups -= closedMarkups
if openMarkups < 0 {
return m, 0, fmt.Errorf("invalid marker open markups count")
}
// set closed markups
m.ClosedMarkups = closedMarkups
// parse text marker
if markerType == TextMarker {
// get text
text, ok := marker[3].(string)
if !ok {
return m, 0, fmt.Errorf("invalid marker text")
}
// set text
m.Text = text
}
// parse atom marker
if markerType == AtomMarker {
// get index
index, ok := toInt(marker[3])
if !ok || index >= len(atoms) {
return m, 0, fmt.Errorf("invalid marker atom index")
}
// set atom
m.Atom = &atoms[index]
}
return m, openMarkups, nil
}