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* Three behaviours of htmlparser2 are patched here, the first 2 being 'convenience' patches
* to avoid repeated passing of lowerCaseAttributeNames and recognizeSelfClosing options.
* 1. Defaulting to self closing tag recognition
* 2. Disabling automatic attribute name conversion to lower case
* 3. Ability to inject/whitelist certain tags to be parsed like script/style tags do. ('special' tags)
*/
const { Tokenizer, Parser } = require('htmlparser2');
/*
Enable any self closing tags '<xx />' to be parsed.
This allows MarkBind's own components to be recognised as such (e.g. '<panel />').
This is equivalent to the { recognizeSelfClosing: true } option of htmlparser2;
We modify the relevant code to avoid passing it in repeatedly.
*/
Parser.prototype.onselfclosingtag = function () {
this._closeCurrentTag();
};
/*
Disable automatic lower case conversion.
This is equivalent to the { lowerCaseAttributeNames: false } option of htmlparser2;
We modify the relevant code to avoid passing it in repeatedly as well.
*/
Parser.prototype.onattribname = function (name) {
this._attribname = name;
};
/* eslint-disable
brace-style,
indent,
keyword-spacing,
max-len,
no-mixed-spaces-and-tabs,
no-multi-spaces,
no-plusplus,
no-tabs,
no-unused-vars,
no-var,
one-var,
quotes,
semi,
space-before-blocks,
space-before-function-paren,
spaced-comment,
vars-on-top,
*/
var i = 0,
TEXT = i++,
BEFORE_TAG_NAME = i++, //after <
IN_TAG_NAME = i++,
IN_SELF_CLOSING_TAG = i++,
BEFORE_CLOSING_TAG_NAME = i++,
IN_CLOSING_TAG_NAME = i++,
AFTER_CLOSING_TAG_NAME = i++,
//attributes
BEFORE_ATTRIBUTE_NAME = i++,
IN_ATTRIBUTE_NAME = i++,
AFTER_ATTRIBUTE_NAME = i++,
BEFORE_ATTRIBUTE_VALUE = i++,
IN_ATTRIBUTE_VALUE_DQ = i++, // "
IN_ATTRIBUTE_VALUE_SQ = i++, // '
IN_ATTRIBUTE_VALUE_NQ = i++,
//declarations
BEFORE_DECLARATION = i++, // !
IN_DECLARATION = i++,
//processing instructions
IN_PROCESSING_INSTRUCTION = i++, // ?
//comments
BEFORE_COMMENT = i++,
IN_COMMENT = i++,
AFTER_COMMENT_1 = i++,
AFTER_COMMENT_2 = i++,
//cdata
BEFORE_CDATA_1 = i++, // [
BEFORE_CDATA_2 = i++, // C
BEFORE_CDATA_3 = i++, // D
BEFORE_CDATA_4 = i++, // A
BEFORE_CDATA_5 = i++, // T
BEFORE_CDATA_6 = i++, // A
IN_CDATA = i++, // [
AFTER_CDATA_1 = i++, // ]
AFTER_CDATA_2 = i++, // ]
//special tags
BEFORE_SPECIAL = i++, //S
BEFORE_SPECIAL_END = i++, //S
/*
SCRIPT and STYLE states are preserved to maintain consistency of
un-patched methods using state numbers greater than them in htmlparser2.
*/
BEFORE_SCRIPT_1 = i++, //C
BEFORE_SCRIPT_2 = i++, //R
BEFORE_SCRIPT_3 = i++, //I
BEFORE_SCRIPT_4 = i++, //P
BEFORE_SCRIPT_5 = i++, //T
AFTER_SCRIPT_1 = i++, //C
AFTER_SCRIPT_2 = i++, //R
AFTER_SCRIPT_3 = i++, //I
AFTER_SCRIPT_4 = i++, //P
AFTER_SCRIPT_5 = i++, //T
BEFORE_STYLE_1 = i++, //T
BEFORE_STYLE_2 = i++, //Y
BEFORE_STYLE_3 = i++, //L
BEFORE_STYLE_4 = i++, //E
AFTER_STYLE_1 = i++, //T
AFTER_STYLE_2 = i++, //Y
AFTER_STYLE_3 = i++, //L
AFTER_STYLE_4 = i++, //E
BEFORE_ENTITY = i++, //&
BEFORE_NUMERIC_ENTITY = i++, //#
IN_NAMED_ENTITY = i++,
IN_NUMERIC_ENTITY = i++,
IN_HEX_ENTITY = i++, //X
SPECIAL_NONE = 0,
/*
Non parser-state constants
*/
// _matchSpecialTagsNextCharacters, _matchNextSpecialTagClosingCharacter
HAS_MATCHING = -1,
NO_MATCH = -2,
HAS_MATCHED = -3;
const DEFAULT_SPECIAL_TAGS = [
'script',
'site-nav',
'style',
'variable',
'markdown',
'md',
];
function whitespace(c) {
return c === " " || c === "\n" || c === "\t" || c === "\f" || c === "\r";
}
Tokenizer.prototype.specialTagNames = [...DEFAULT_SPECIAL_TAGS];
/**
* Checks whether the token matches one of the first characters of the special tags,
* and initialises the _matchingSpecialTagIndexes array with the matches' indexes if so.
*/
Tokenizer.prototype._matchSpecialTagsFirstCharacters = function(c) {
this._matchingSpecialTagIndexes = [];
const numSpecialTags = this.specialTagNames.length;
const lowerCaseChar = c.toLowerCase();
for (let j = 0; j < numSpecialTags; j += 1) {
if (lowerCaseChar === this.specialTagNames[j][0]) {
this._matchingSpecialTagIndexes.push(j)
}
}
if (this._matchingSpecialTagIndexes.length > 0) {
this._nextSpecialTagMatchIndex = 1;
return true;
}
return false;
};
/**
* Processes the _matchingSpecialTagIndexes array, filtering out previous match indexes
* that do not match the current token.
* If one of the previous matches successfully matched, the match index is returned.
*/
Tokenizer.prototype._matchSpecialTagsNextCharacters = function(c) {
const matchingSpecialTags = [];
const numMatchingTags = this._matchingSpecialTagIndexes.length;
const lowerCaseChar = c.toLowerCase();
for (let j = 0; j < numMatchingTags; j += 1) {
const tagIndex = this._matchingSpecialTagIndexes[j];
const testChar = this.specialTagNames[tagIndex][this._nextSpecialTagMatchIndex];
if (testChar === undefined) {
Eif (c === "/" || c === ">" || whitespace(c)) {
return tagIndex;
}
} else if (testChar === lowerCaseChar) {
matchingSpecialTags.push(tagIndex);
}
}
this._matchingSpecialTagIndexes = matchingSpecialTags;
return this._matchingSpecialTagIndexes.length > 0
? HAS_MATCHING
: NO_MATCH;
};
/**
* Changes the Tokenizer state to BEFORE_SPECIAL if the token matches one of
* the first characters of _specialTagNames.
*/
Tokenizer.prototype._stateBeforeTagName = function(c) {
if (c === "/") {
this._state = BEFORE_CLOSING_TAG_NAME;
} else Iif (c === "<") {
this._cbs.ontext(this._getSection());
this._sectionStart = this._index;
} else if (c === ">" || this._special !== SPECIAL_NONE || whitespace(c)) {
this._state = TEXT;
} else Iif (c === "!") {
this._state = BEFORE_DECLARATION;
this._sectionStart = this._index + 1;
} else Iif (c === "?") {
this._state = IN_PROCESSING_INSTRUCTION;
this._sectionStart = this._index + 1;
} else {
// We want special tag treatment to be xmlMode independent for MarkBind.
this._state = this._matchSpecialTagsFirstCharacters(c)
? BEFORE_SPECIAL
: IN_TAG_NAME;
this._sectionStart = this._index;
}
};
/**
* Changes the Tokenizer state to IN_TAG_NAME or BEFORE_SPECIAL state again depending
* on whether there are still matches in _matchingSpecialTagIndexes.
*/
Tokenizer.prototype._stateBeforeSpecial = function(c) {
const result = this._matchSpecialTagsNextCharacters(c);
if (result === HAS_MATCHING) {
this._nextSpecialTagMatchIndex += 1;
return;
}
// Reset for _matchNextSpecialTagClosingCharacter later
this._nextSpecialTagMatchIndex = 0;
this._state = IN_TAG_NAME;
this._index--; //consume the token again
if (result === NO_MATCH) {
return;
}
/*
Assign the one-based index of the matching tag in the special tags array.
This is due to htmlparser2 using 0 for SPECIAL_NONE,
which would conflict with a zero-based index.
*/
this._special = result + 1;
};
/**
* Patched self closing tag state handler that removes the special state
* if the special tag was self-closed.
*/
Tokenizer.prototype._stateInSelfClosingTag = function(c) {
if (c === ">") {
this._cbs.onselfclosingtag();
this._state = TEXT;
this._sectionStart = this._index + 1;
/*
Allow all special tags to be self-closed.
Script and style tags are also allowed to be self-closed,
which breaks from the default html spec-compliant of behaviour of htmlparser2.
We allow this as such tags would be expanded upon re-rendering the html anyway.
ie. '<script ... />' would end up as '<script ...></script>'
*/
this._special = SPECIAL_NONE;
} else Eif (!whitespace(c)) {
this._state = BEFORE_ATTRIBUTE_NAME;
this._index--;
}
};
/**
* Processes the _special flag and _nextSpecialTagMatchIndex state variable,
* returning a flag indicating whether the current special tag has finished matching or not.
*/
Tokenizer.prototype._matchNextSpecialTagClosingCharacter = function(c) {
const nextTestChar = this.specialTagNames[this._special - 1][this._nextSpecialTagMatchIndex];
if (nextTestChar === undefined) {
this._nextSpecialTagMatchIndex = 0;
return (c === ">" || whitespace(c))
? HAS_MATCHED
: NO_MATCH;
} else if (nextTestChar === c.toLowerCase()) {
this._nextSpecialTagMatchIndex += 1;
return HAS_MATCHING;
}
this._nextSpecialTagMatchIndex = 0;
return NO_MATCH;
};
/**
* Changes the Tokenizer state to BEFORE_SPECIAL_END if the token matches one of
* the first character of the currently matched special tag.
*/
Tokenizer.prototype._stateBeforeCloseingTagName = function(c) {
Iif (whitespace(c));
else Iif (c === ">") {
this._state = TEXT;
} else if (this._special !== SPECIAL_NONE) {
if (this._matchNextSpecialTagClosingCharacter(c) !== NO_MATCH) {
this._state = BEFORE_SPECIAL_END;
} else {
this._state = TEXT;
this._index--;
}
} else {
this._state = IN_CLOSING_TAG_NAME;
this._sectionStart = this._index;
}
};
/**
* Changes the Tokenizer state back to TEXT, IN_TAG_NAME depending
* on whether the token has finished or is still matching
* the currently matched special tag.
*/
Tokenizer.prototype._stateBeforeSpecialEnd = function(c) {
const result = this._matchNextSpecialTagClosingCharacter(c);
if (result === HAS_MATCHING) {
return;
}
Eif (result === HAS_MATCHED) {
this._sectionStart = this._index - this.specialTagNames[this._special - 1].length;
this._special = SPECIAL_NONE;
this._state = IN_CLOSING_TAG_NAME;
this._index--; //reconsume the token
return;
}
this._index--;
this._state = TEXT;
};
/**
* Altered _parse handler that handles the extra MARKDOWN state.
* BEFORE/AFTER SCRIPT and STYLE state handlers are made redundant
* by the above patches and removed as well.
*/
Tokenizer.prototype._parse = function(){
while(this._index < this._buffer.length && this._running){
var c = this._buffer.charAt(this._index);
if(this._state === TEXT){
this._stateText(c);
} else if(this._state === BEFORE_TAG_NAME){
this._stateBeforeTagName(c);
} else if(this._state === IN_TAG_NAME){
this._stateInTagName(c);
} else if(this._state === BEFORE_CLOSING_TAG_NAME){
this._stateBeforeCloseingTagName(c);
} else if(this._state === IN_CLOSING_TAG_NAME){
this._stateInCloseingTagName(c);
} else if(this._state === AFTER_CLOSING_TAG_NAME){
this._stateAfterCloseingTagName(c);
} else if(this._state === IN_SELF_CLOSING_TAG){
this._stateInSelfClosingTag(c);
}
/*
* attributes
*/
else if(this._state === BEFORE_ATTRIBUTE_NAME){
this._stateBeforeAttributeName(c);
} else if(this._state === IN_ATTRIBUTE_NAME){
this._stateInAttributeName(c);
} else if(this._state === AFTER_ATTRIBUTE_NAME){
this._stateAfterAttributeName(c);
} else if(this._state === BEFORE_ATTRIBUTE_VALUE){
this._stateBeforeAttributeValue(c);
} else if(this._state === IN_ATTRIBUTE_VALUE_DQ){
this._stateInAttributeValueDoubleQuotes(c);
} else Iif(this._state === IN_ATTRIBUTE_VALUE_SQ){
this._stateInAttributeValueSingleQuotes(c);
} else Iif(this._state === IN_ATTRIBUTE_VALUE_NQ){
this._stateInAttributeValueNoQuotes(c);
}
/*
* declarations
*/
else Iif(this._state === BEFORE_DECLARATION){
this._stateBeforeDeclaration(c);
} else Iif(this._state === IN_DECLARATION){
this._stateInDeclaration(c);
}
/*
* processing instructions
*/
else Iif(this._state === IN_PROCESSING_INSTRUCTION){
this._stateInProcessingInstruction(c);
}
/*
* comments
*/
else Iif(this._state === BEFORE_COMMENT){
this._stateBeforeComment(c);
} else Iif(this._state === IN_COMMENT){
this._stateInComment(c);
} else Iif(this._state === AFTER_COMMENT_1){
this._stateAfterComment1(c);
} else Iif(this._state === AFTER_COMMENT_2){
this._stateAfterComment2(c);
}
/*
* cdata
*/
else Iif(this._state === BEFORE_CDATA_1){
this._stateBeforeCdata1(c);
} else Iif(this._state === BEFORE_CDATA_2){
this._stateBeforeCdata2(c);
} else Iif(this._state === BEFORE_CDATA_3){
this._stateBeforeCdata3(c);
} else Iif(this._state === BEFORE_CDATA_4){
this._stateBeforeCdata4(c);
} else Iif(this._state === BEFORE_CDATA_5){
this._stateBeforeCdata5(c);
} else Iif(this._state === BEFORE_CDATA_6){
this._stateBeforeCdata6(c);
} else Iif(this._state === IN_CDATA){
this._stateInCdata(c);
} else Iif(this._state === AFTER_CDATA_1){
this._stateAfterCdata1(c);
} else Iif(this._state === AFTER_CDATA_2){
this._stateAfterCdata2(c);
}
/*
* special tags
*/
else if(this._state === BEFORE_SPECIAL){
this._stateBeforeSpecial(c);
} else if(this._state === BEFORE_SPECIAL_END){
this._stateBeforeSpecialEnd(c);
}
/*
* entities
*/
else Eif(this._state === BEFORE_ENTITY){
this._stateBeforeEntity(c);
} else if(this._state === BEFORE_NUMERIC_ENTITY){
this._stateBeforeNumericEntity(c);
} else if(this._state === IN_NAMED_ENTITY){
this._stateInNamedEntity(c);
} else if(this._state === IN_NUMERIC_ENTITY){
this._stateInNumericEntity(c);
} else if(this._state === IN_HEX_ENTITY){
this._stateInHexEntity(c);
}
else {
this._cbs.onerror(Error("unknown _state"), this._state);
}
this._index++;
}
this._cleanup();
};
/**
* Injects the tagsToIgnore into the Tokenizer's specialTagNames.
*/
function injectIgnoreTags(tagsToIgnore) {
Tokenizer.prototype.specialTagNames = [...DEFAULT_SPECIAL_TAGS, ...tagsToIgnore];
}
module.exports = {
injectIgnoreTags,
};
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