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const Token = require('./Token.class')
module.exports = class HtmlParser extends Writable {
constructor() {
super()
let currentToken = null
let currentAttribueName = ''
let currentAttribueValue = ''
let currentTagName = ''
const emit = token => {
this.emit('data', token.getLog())
}
const isWhiteSpace = char => {
return char === ' ' || char === '\t' || char === '\n'
}
const dataState = char => {
// if (char === '&') return dataState
if (char === '<') {
currentToken = new Token()
currentToken.setType('openTag')
return tagOpen
}
emit(new Token('char', char))
return dataState
}
const tagOpen = char => {
currentTagName = ''
if (char === ' ') return tagOpen
if (char === '/') return tagEnd
return tagName(char) // reconsume
}
const tagName = char => {
if (isWhiteSpace(char)) return beforeAttribute
if (char === '/') return selfClosingStartTag
if (char === '>') {
currentToken.setContent(currentTagName)
emit(currentToken)
return dataState
}
currentTagName += char
return tagName
}
const beforeAttribute = char => {
if (isWhiteSpace(char)) return beforeAttribute
if (char === '/') return selfClosingStartTag
if (char === '>') {
currentToken.setContent(currentTagName)
emit(currentToken)
return dataState
}
currentAttribueName = ''
return attributeName(char)
}
const attributeName = char => {
if (isWhiteSpace(char)) return attributeName
if (char === '/') {
currentToken.setAttribute(currentAttribueName, currentAttribueName)
return selfClosingStartTag
}
if (char === '=') return beforeAttributeValue
currentAttribueName += char
return attributeName
}
const beforeAttributeValue = char => {
if (isWhiteSpace(char)) return beforeAttributeValue
currentAttribueValue = ''
if (char === '"') return attributeValueDouble
if (char === `'`) return attributeValueSingle
if (char === '>') {
currentToken.setAttribute(currentAttribueName, currentAttribueValue)
currentToken.setContent(currentTagName)
emit(currentToken)
return dataState
}
return attributeValueUnquoted(char)
}
const attributeValueDouble = char => {
if (char === '"') {
currentToken.setAttribute(currentAttribueName, currentAttribueValue)
return afterAttributeValueQuoted
}
// if (char === '&') return attributeValueDouble
currentAttribueValue += char
return attributeValueDouble
}
const attributeValueSingle = char => {
if (char === `'`) {
currentToken.setAttribute(currentAttribueName, currentAttribueValue)
return afterAttributeValueQuoted
}
// if (char === '&') return attributeValueSingle
currentAttribueValue += char
return attributeValueSingle
}
const attributeValueUnquoted = char => {
if (isWhiteSpace(char)) {
currentToken.setAttribute(currentAttribueName, currentAttribueValue)
return beforeAttribute
}
if (char === '/') {
currentToken.setAttribute(currentAttribueName, currentAttribueValue)
return selfClosingStartTag
}
// if (char === '&') return attributeValueUnquoted
if (char === '>') {
currentToken.setAttribute(currentAttribueName, currentAttribueValue)
currentToken.setContent(currentTagName)
emit(currentToken)
return dataState
}
currentAttribueValue += char
return attributeValueUnquoted
}
const afterAttributeValueQuoted = char => {
if (char === '/') return selfClosingStartTag
if (char === '>') {
currentToken.setContent(currentTagName)
emit(currentToken)
return dataState
}
return beforeAttribute(char)
}
const selfClosingStartTag = char => {
if (char === '>') {
currentToken.setType('selfClosingTag')
currentToken.setContent(currentTagName)
emit(currentToken)
return dataState
}
return selfClosingStartTag
}
const tagEnd = char => {
if (isWhiteSpace(char)) return tagEnd
if (char === '>') {
currentToken = new Token('closeTag')
emit(currentToken)
return dataState
}
currentToken.setType('closeTag')
return tagName(char)
}
this.state = dataState
}
write(char) {
this.state = this.state(char)
}
end() {
this.emit('end')
}
} |