var openParentheses = "(".charCodeAt(0);
var closeParentheses = ")".charCodeAt(0);
var singleQuote = "'".charCodeAt(0);
var doubleQuote = '"'.charCodeAt(0);
var backslash = "\\".charCodeAt(0);
var slash = "/".charCodeAt(0);
var comma = ",".charCodeAt(0);
var colon = ":".charCodeAt(0);
var star = "*".charCodeAt(0);
var uLower = "u".charCodeAt(0);
var uUpper = "U".charCodeAt(0);
var plus = "+".charCodeAt(0);
var isUnicodeRange = /^[a-f0-9?-]+$/i;
module.exports = function(input) {
var tokens = [];
var value = input;
var next,
quote,
prev,
token,
escape,
escapePos,
whitespacePos,
parenthesesOpenPos;
var pos = 0;
var code = value.charCodeAt(pos);
var max = value.length;
var stack = [{ nodes: tokens }];
var balanced = 0;
var parent;
var name = "";
var before = "";
var after = "";
while (pos < max) {
// Whitespaces
if (code <= 32) {
next = pos;
do {
next += 1;
code = value.charCodeAt(next);
} while (code <= 32);
token = value.slice(pos, next);
prev = tokens[tokens.length - 1];
if (code === closeParentheses && balanced) {
after = token;
} else if (prev && prev.type === "div") {
prev.after = token;
prev.sourceEndIndex += token.length;
} else if (
code === comma ||
code === colon ||
(code === slash &&
value.charCodeAt(next + 1) !== star &&
(!parent ||
(parent && parent.type === "function" && parent.value !== "calc")))
) {
before = token;
} else {
tokens.push({
type: "space",
sourceIndex: pos,
sourceEndIndex: next,
value: token
});
}
pos = next;
// Quotes
} else if (code === singleQuote || code === doubleQuote) {
next = pos;
quote = code === singleQuote ? "'" : '"';
token = {
type: "string",
sourceIndex: pos,
quote: quote
};
do {
escape = false;
next = value.indexOf(quote, next + 1);
if (~next) {
escapePos = next;
while (value.charCodeAt(escapePos - 1) === backslash) {
escapePos -= 1;
escape = !escape;
}
} else {
value += quote;
next = value.length - 1;
token.unclosed = true;
}
} while (escape);
token.value = value.slice(pos + 1, next);
token.sourceEndIndex = token.unclosed ? next : next + 1;
tokens.push(token);
pos = next + 1;
code = value.charCodeAt(pos);
// Comments
} else if (code === slash && value.charCodeAt(pos + 1) === star) {
next = value.indexOf("*/", pos);
token = {
type: "comment",
sourceIndex: pos,
sourceEndIndex: next + 2
};
if (next === -1) {
token.unclosed = true;
next = value.length;
token.sourceEndIndex = next;
}
token.value = value.slice(pos + 2, next);
tokens.push(token);
pos = next + 2;
code = value.charCodeAt(pos);
// Operation within calc
} else if (
(code === slash || code === star) &&
parent &&
parent.type === "function" &&
parent.value === "calc"
) {
token = value[pos];
tokens.push({
type: "word",
sourceIndex: pos - before.length,
sourceEndIndex: pos + token.length,
value: token
});
pos += 1;
code = value.charCodeAt(pos);
// Dividers
} else if (code === slash || code === comma || code === colon) {
token = value[pos];
tokens.push({
type: "div",
sourceIndex: pos - before.length,
sourceEndIndex: pos + token.length,
value: token,
before: before,
after: ""
});
before = "";
pos += 1;
code = value.charCodeAt(pos);
// Open parentheses
} else if (openParentheses === code) {
// Whitespaces after open parentheses
next = pos;
do {
next += 1;
code = value.charCodeAt(next);
} while (code <= 32);
parenthesesOpenPos = pos;
token = {
type: "function",
sourceIndex: pos - name.length,
value: name,
before: value.slice(parenthesesOpenPos + 1, next)
};
pos = next;
if (name === "url" && code !== singleQuote && code !== doubleQuote) {
next -= 1;
do {
escape = false;
next = value.indexOf(")", next + 1);
if (~next) {
escapePos = next;
while (value.charCodeAt(escapePos - 1) === backslash) {
escapePos -= 1;
escape = !escape;
}
} else {
value += ")";
next = value.length - 1;
token.unclosed = true;
}
} while (escape);
// Whitespaces before closed
whitespacePos = next;
do {
whitespacePos -= 1;
code = value.charCodeAt(whitespacePos);
} while (code <= 32);
if (parenthesesOpenPos < whitespacePos) {
if (pos !== whitespacePos + 1) {
token.nodes = [
{
type: "word",
sourceIndex: pos,
sourceEndIndex: whitespacePos + 1,
value: value.slice(pos, whitespacePos + 1)
}
];
} else {
token.nodes = [];
}
if (token.unclosed && whitespacePos + 1 !== next) {
token.after = "";
token.nodes.push({
type: "space",
sourceIndex: whitespacePos + 1,
sourceEndIndex: next,
value: value.slice(whitespacePos + 1, next)
});
} else {
token.after = value.slice(whitespacePos + 1, next);
token.sourceEndIndex = next;
}
} else {
token.after = "";
token.nodes = [];
}
pos = next + 1;
token.sourceEndIndex = token.unclosed ? next : pos;
code = value.charCodeAt(pos);
tokens.push(token);
} else {
balanced += 1;
token.after = "";
token.sourceEndIndex = pos + 1;
tokens.push(token);
stack.push(token);
tokens = token.nodes = [];
parent = token;
}
name = "";
// Close parentheses
} else if (closeParentheses === code && balanced) {
pos += 1;
code = value.charCodeAt(pos);
parent.after = after;
parent.sourceEndIndex += after.length;
after = "";
balanced -= 1;
stack[stack.length - 1].sourceEndIndex = pos;
stack.pop();
parent = stack[balanced];
tokens = parent.nodes;
// Words
} else {
next = pos;
do {
if (code === backslash) {
next += 1;
}
next += 1;
code = value.charCodeAt(next);
} while (
next < max &&
!(
code <= 32 ||
code === singleQuote ||
code === doubleQuote ||
code === comma ||
code === colon ||
code === slash ||
code === openParentheses ||
(code === star &&
parent &&
parent.type === "function" &&
parent.value === "calc") ||
(code === slash &&
parent.type === "function" &&
parent.value === "calc") ||
(code === closeParentheses && balanced)
)
);
token = value.slice(pos, next);
if (openParentheses === code) {
name = token;
} else if (
(uLower === token.charCodeAt(0) || uUpper === token.charCodeAt(0)) &&
plus === token.charCodeAt(1) &&
isUnicodeRange.test(token.slice(2))
) {
tokens.push({
type: "unicode-range",
sourceIndex: pos,
sourceEndIndex: next,
value: token
});
} else {
tokens.push({
type: "word",
sourceIndex: pos,
sourceEndIndex: next,
value: token
});
}
pos = next;
}
}
for (pos = stack.length - 1; pos; pos -= 1) {
stack[pos].unclosed = true;
stack[pos].sourceEndIndex = value.length;
}
return stack[0].nodes;
};