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rOACCT/node_modules/acorn-jsx/index.js
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index.js
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'use strict';
const XHTMLEntities = require('./xhtml');
const hexNumber = /^[\da-fA-F]+$/;
const decimalNumber = /^\d+$/;
// The map to `acorn-jsx` tokens from `acorn` namespace objects.
const acornJsxMap = new WeakMap();
// Get the original tokens for the given `acorn` namespace object.
function getJsxTokens(acorn) {
acorn = acorn.Parser.acorn || acorn;
let acornJsx = acornJsxMap.get(acorn);
if (!acornJsx) {
const tt = acorn.tokTypes;
const TokContext = acorn.TokContext;
const TokenType = acorn.TokenType;
const tc_oTag = new TokContext('<tag', false);
const tc_cTag = new TokContext('</tag', false);
const tc_expr = new TokContext('<tag>...</tag>', true, true);
const tokContexts = {
tc_oTag: tc_oTag,
tc_cTag: tc_cTag,
tc_expr: tc_expr
};
const tokTypes = {
jsxName: new TokenType('jsxName'),
jsxText: new TokenType('jsxText', {beforeExpr: true}),
jsxTagStart: new TokenType('jsxTagStart', {startsExpr: true}),
jsxTagEnd: new TokenType('jsxTagEnd')
};
tokTypes.jsxTagStart.updateContext = function() {
this.context.push(tc_expr); // treat as beginning of JSX expression
this.context.push(tc_oTag); // start opening tag context
this.exprAllowed = false;
};
tokTypes.jsxTagEnd.updateContext = function(prevType) {
let out = this.context.pop();
if (out === tc_oTag && prevType === tt.slash || out === tc_cTag) {
this.context.pop();
this.exprAllowed = this.curContext() === tc_expr;
} else {
this.exprAllowed = true;
}
};
acornJsx = { tokContexts: tokContexts, tokTypes: tokTypes };
acornJsxMap.set(acorn, acornJsx);
}
return acornJsx;
}
// Transforms JSX element name to string.
function getQualifiedJSXName(object) {
if (!object)
return object;
if (object.type === 'JSXIdentifier')
return object.name;
if (object.type === 'JSXNamespacedName')
return object.namespace.name + ':' + object.name.name;
if (object.type === 'JSXMemberExpression')
return getQualifiedJSXName(object.object) + '.' +
getQualifiedJSXName(object.property);
}
module.exports = function(options) {
options = options || {};
return function(Parser) {
return plugin({
allowNamespaces: options.allowNamespaces !== false,
allowNamespacedObjects: !!options.allowNamespacedObjects
}, Parser);
};
};
// This is `tokTypes` of the peer dep.
// This can be different instances from the actual `tokTypes` this plugin uses.
Object.defineProperty(module.exports, "tokTypes", {
get: function get_tokTypes() {
return getJsxTokens(require("acorn")).tokTypes;
},
configurable: true,
enumerable: true
});
function plugin(options, Parser) {
const acorn = Parser.acorn || require("acorn");
const acornJsx = getJsxTokens(acorn);
const tt = acorn.tokTypes;
const tok = acornJsx.tokTypes;
const tokContexts = acorn.tokContexts;
const tc_oTag = acornJsx.tokContexts.tc_oTag;
const tc_cTag = acornJsx.tokContexts.tc_cTag;
const tc_expr = acornJsx.tokContexts.tc_expr;
const isNewLine = acorn.isNewLine;
const isIdentifierStart = acorn.isIdentifierStart;
const isIdentifierChar = acorn.isIdentifierChar;
return class extends Parser {
// Expose actual `tokTypes` and `tokContexts` to other plugins.
static get acornJsx() {
return acornJsx;
}
// Reads inline JSX contents token.
jsx_readToken() {
let out = '', chunkStart = this.pos;
for (;;) {
if (this.pos >= this.input.length)
this.raise(this.start, 'Unterminated JSX contents');
let ch = this.input.charCodeAt(this.pos);
switch (ch) {
case 60: // '<'
case 123: // '{'
if (this.pos === this.start) {
if (ch === 60 && this.exprAllowed) {
++this.pos;
return this.finishToken(tok.jsxTagStart);
}
return this.getTokenFromCode(ch);
}
out += this.input.slice(chunkStart, this.pos);
return this.finishToken(tok.jsxText, out);
case 38: // '&'
out += this.input.slice(chunkStart, this.pos);
out += this.jsx_readEntity();
chunkStart = this.pos;
break;
case 62: // '>'
case 125: // '}'
this.raise(
this.pos,
"Unexpected token `" + this.input[this.pos] + "`. Did you mean `" +
(ch === 62 ? "&gt;" : "&rbrace;") + "` or " + "`{\"" + this.input[this.pos] + "\"}" + "`?"
);
default:
if (isNewLine(ch)) {
out += this.input.slice(chunkStart, this.pos);
out += this.jsx_readNewLine(true);
chunkStart = this.pos;
} else {
++this.pos;
}
}
}
}
jsx_readNewLine(normalizeCRLF) {
let ch = this.input.charCodeAt(this.pos);
let out;
++this.pos;
if (ch === 13 && this.input.charCodeAt(this.pos) === 10) {
++this.pos;
out = normalizeCRLF ? '\n' : '\r\n';
} else {
out = String.fromCharCode(ch);
}
if (this.options.locations) {
++this.curLine;
this.lineStart = this.pos;
}
return out;
}
jsx_readString(quote) {
let out = '', chunkStart = ++this.pos;
for (;;) {
if (this.pos >= this.input.length)
this.raise(this.start, 'Unterminated string constant');
let ch = this.input.charCodeAt(this.pos);
if (ch === quote) break;
if (ch === 38) { // '&'
out += this.input.slice(chunkStart, this.pos);
out += this.jsx_readEntity();
chunkStart = this.pos;
} else if (isNewLine(ch)) {
out += this.input.slice(chunkStart, this.pos);
out += this.jsx_readNewLine(false);
chunkStart = this.pos;
} else {
++this.pos;
}
}
out += this.input.slice(chunkStart, this.pos++);
return this.finishToken(tt.string, out);
}
jsx_readEntity() {
let str = '', count = 0, entity;
let ch = this.input[this.pos];
if (ch !== '&')
this.raise(this.pos, 'Entity must start with an ampersand');
let startPos = ++this.pos;
while (this.pos < this.input.length && count++ < 10) {
ch = this.input[this.pos++];
if (ch === ';') {
if (str[0] === '#') {
if (str[1] === 'x') {
str = str.substr(2);
if (hexNumber.test(str))
entity = String.fromCharCode(parseInt(str, 16));
} else {
str = str.substr(1);
if (decimalNumber.test(str))
entity = String.fromCharCode(parseInt(str, 10));
}
} else {
entity = XHTMLEntities[str];
}
break;
}
str += ch;
}
if (!entity) {
this.pos = startPos;
return '&';
}
return entity;
}
// Read a JSX identifier (valid tag or attribute name).
//
// Optimized version since JSX identifiers can't contain
// escape characters and so can be read as single slice.
// Also assumes that first character was already checked
// by isIdentifierStart in readToken.
jsx_readWord() {
let ch, start = this.pos;
do {
ch = this.input.charCodeAt(++this.pos);
} while (isIdentifierChar(ch) || ch === 45); // '-'
return this.finishToken(tok.jsxName, this.input.slice(start, this.pos));
}
// Parse next token as JSX identifier
jsx_parseIdentifier() {
let node = this.startNode();
if (this.type === tok.jsxName)
node.name = this.value;
else if (this.type.keyword)
node.name = this.type.keyword;
else
this.unexpected();
this.next();
return this.finishNode(node, 'JSXIdentifier');
}
// Parse namespaced identifier.
jsx_parseNamespacedName() {
let startPos = this.start, startLoc = this.startLoc;
let name = this.jsx_parseIdentifier();
if (!options.allowNamespaces || !this.eat(tt.colon)) return name;
var node = this.startNodeAt(startPos, startLoc);
node.namespace = name;
node.name = this.jsx_parseIdentifier();
return this.finishNode(node, 'JSXNamespacedName');
}
// Parses element name in any form - namespaced, member
// or single identifier.
jsx_parseElementName() {
if (this.type === tok.jsxTagEnd) return '';
let startPos = this.start, startLoc = this.startLoc;
let node = this.jsx_parseNamespacedName();
if (this.type === tt.dot && node.type === 'JSXNamespacedName' && !options.allowNamespacedObjects) {
this.unexpected();
}
while (this.eat(tt.dot)) {
let newNode = this.startNodeAt(startPos, startLoc);
newNode.object = node;
newNode.property = this.jsx_parseIdentifier();
node = this.finishNode(newNode, 'JSXMemberExpression');
}
return node;
}
// Parses any type of JSX attribute value.
jsx_parseAttributeValue() {
switch (this.type) {
case tt.braceL:
let node = this.jsx_parseExpressionContainer();
if (node.expression.type === 'JSXEmptyExpression')
this.raise(node.start, 'JSX attributes must only be assigned a non-empty expression');
return node;
case tok.jsxTagStart:
case tt.string:
return this.parseExprAtom();
default:
this.raise(this.start, 'JSX value should be either an expression or a quoted JSX text');
}
}
// JSXEmptyExpression is unique type since it doesn't actually parse anything,
// and so it should start at the end of last read token (left brace) and finish
// at the beginning of the next one (right brace).
jsx_parseEmptyExpression() {
let node = this.startNodeAt(this.lastTokEnd, this.lastTokEndLoc);
return this.finishNodeAt(node, 'JSXEmptyExpression', this.start, this.startLoc);
}
// Parses JSX expression enclosed into curly brackets.
jsx_parseExpressionContainer() {
let node = this.startNode();
this.next();
node.expression = this.type === tt.braceR
? this.jsx_parseEmptyExpression()
: this.parseExpression();
this.expect(tt.braceR);
return this.finishNode(node, 'JSXExpressionContainer');
}
// Parses following JSX attribute name-value pair.
jsx_parseAttribute() {
let node = this.startNode();
if (this.eat(tt.braceL)) {
this.expect(tt.ellipsis);
node.argument = this.parseMaybeAssign();
this.expect(tt.braceR);
return this.finishNode(node, 'JSXSpreadAttribute');
}
node.name = this.jsx_parseNamespacedName();
node.value = this.eat(tt.eq) ? this.jsx_parseAttributeValue() : null;
return this.finishNode(node, 'JSXAttribute');
}
// Parses JSX opening tag starting after '<'.
jsx_parseOpeningElementAt(startPos, startLoc) {
let node = this.startNodeAt(startPos, startLoc);
node.attributes = [];
let nodeName = this.jsx_parseElementName();
if (nodeName) node.name = nodeName;
while (this.type !== tt.slash && this.type !== tok.jsxTagEnd)
node.attributes.push(this.jsx_parseAttribute());
node.selfClosing = this.eat(tt.slash);
this.expect(tok.jsxTagEnd);
return this.finishNode(node, nodeName ? 'JSXOpeningElement' : 'JSXOpeningFragment');
}
// Parses JSX closing tag starting after '</'.
jsx_parseClosingElementAt(startPos, startLoc) {
let node = this.startNodeAt(startPos, startLoc);
let nodeName = this.jsx_parseElementName();
if (nodeName) node.name = nodeName;
this.expect(tok.jsxTagEnd);
return this.finishNode(node, nodeName ? 'JSXClosingElement' : 'JSXClosingFragment');
}
// Parses entire JSX element, including it's opening tag
// (starting after '<'), attributes, contents and closing tag.
jsx_parseElementAt(startPos, startLoc) {
let node = this.startNodeAt(startPos, startLoc);
let children = [];
let openingElement = this.jsx_parseOpeningElementAt(startPos, startLoc);
let closingElement = null;
if (!openingElement.selfClosing) {
contents: for (;;) {
switch (this.type) {
case tok.jsxTagStart:
startPos = this.start; startLoc = this.startLoc;
this.next();
if (this.eat(tt.slash)) {
closingElement = this.jsx_parseClosingElementAt(startPos, startLoc);
break contents;
}
children.push(this.jsx_parseElementAt(startPos, startLoc));
break;
case tok.jsxText:
children.push(this.parseExprAtom());
break;
case tt.braceL:
children.push(this.jsx_parseExpressionContainer());
break;
default:
this.unexpected();
}
}
if (getQualifiedJSXName(closingElement.name) !== getQualifiedJSXName(openingElement.name)) {
this.raise(
closingElement.start,
'Expected corresponding JSX closing tag for <' + getQualifiedJSXName(openingElement.name) + '>');
}
}
let fragmentOrElement = openingElement.name ? 'Element' : 'Fragment';
node['opening' + fragmentOrElement] = openingElement;
node['closing' + fragmentOrElement] = closingElement;
node.children = children;
if (this.type === tt.relational && this.value === "<") {
this.raise(this.start, "Adjacent JSX elements must be wrapped in an enclosing tag");
}
return this.finishNode(node, 'JSX' + fragmentOrElement);
}
// Parse JSX text
jsx_parseText() {
let node = this.parseLiteral(this.value);
node.type = "JSXText";
return node;
}
// Parses entire JSX element from current position.
jsx_parseElement() {
let startPos = this.start, startLoc = this.startLoc;
this.next();
return this.jsx_parseElementAt(startPos, startLoc);
}
parseExprAtom(refShortHandDefaultPos) {
if (this.type === tok.jsxText)
return this.jsx_parseText();
else if (this.type === tok.jsxTagStart)
return this.jsx_parseElement();
else
return super.parseExprAtom(refShortHandDefaultPos);
}
readToken(code) {
let context = this.curContext();
if (context === tc_expr) return this.jsx_readToken();
if (context === tc_oTag || context === tc_cTag) {
if (isIdentifierStart(code)) return this.jsx_readWord();
if (code == 62) {
++this.pos;
return this.finishToken(tok.jsxTagEnd);
}
if ((code === 34 || code === 39) && context == tc_oTag)
return this.jsx_readString(code);
}
if (code === 60 && this.exprAllowed && this.input.charCodeAt(this.pos + 1) !== 33) {
++this.pos;
return this.finishToken(tok.jsxTagStart);
}
return super.readToken(code);
}
updateContext(prevType) {
if (this.type == tt.braceL) {
var curContext = this.curContext();
if (curContext == tc_oTag) this.context.push(tokContexts.b_expr);
else if (curContext == tc_expr) this.context.push(tokContexts.b_tmpl);
else super.updateContext(prevType);
this.exprAllowed = true;
} else if (this.type === tt.slash && prevType === tok.jsxTagStart) {
this.context.length -= 2; // do not consider JSX expr -> JSX open tag -> ... anymore
this.context.push(tc_cTag); // reconsider as closing tag context
this.exprAllowed = false;
} else {
return super.updateContext(prevType);
}
}
};
}
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