lepu-test-platform-web/node_modules/css-tree/lib/lexer/prepare-tokens.js

74 lines
2.1 KiB
JavaScript

var tokenize = require('../tokenizer');
var TokenStream = require('../common/TokenStream');
var tokenStream = new TokenStream();
var astToTokens = {
decorator: function(handlers) {
var curNode = null;
var prev = { len: 0, node: null };
var nodes = [prev];
var buffer = '';
return {
children: handlers.children,
node: function(node) {
var tmp = curNode;
curNode = node;
handlers.node.call(this, node);
curNode = tmp;
},
chunk: function(chunk) {
buffer += chunk;
if (prev.node !== curNode) {
nodes.push({
len: chunk.length,
node: curNode
});
} else {
prev.len += chunk.length;
}
},
result: function() {
return prepareTokens(buffer, nodes);
}
};
}
};
function prepareTokens(str, nodes) {
var tokens = [];
var nodesOffset = 0;
var nodesIndex = 0;
var currentNode = nodes ? nodes[nodesIndex].node : null;
tokenize(str, tokenStream);
while (!tokenStream.eof) {
if (nodes) {
while (nodesIndex < nodes.length && nodesOffset + nodes[nodesIndex].len <= tokenStream.tokenStart) {
nodesOffset += nodes[nodesIndex++].len;
currentNode = nodes[nodesIndex].node;
}
}
tokens.push({
type: tokenStream.tokenType,
value: tokenStream.getTokenValue(),
index: tokenStream.tokenIndex, // TODO: remove it, temporary solution
balance: tokenStream.balance[tokenStream.tokenIndex], // TODO: remove it, temporary solution
node: currentNode
});
tokenStream.next();
// console.log({ ...tokens[tokens.length - 1], node: undefined });
}
return tokens;
}
module.exports = function(value, syntax) {
if (typeof value === 'string') {
return prepareTokens(value, null);
}
return syntax.generate(value, astToTokens);
};