1 files changed, 170 insertions, 0 deletions
diff --git a/vanilla/node_modules/css-tree/cjs/generator/token-before.cjs b/vanilla/node_modules/css-tree/cjs/generator/token-before.cjs
new file mode 100644
index 0000000..87bf4a3
--- /dev/null
+++ b/vanilla/node_modules/css-tree/cjs/generator/token-before.cjs
@@ -0,0 +1,170 @@
+'use strict';
+
+const types = require('../tokenizer/types.cjs');
+
+const PLUSSIGN = 0x002B;    // U+002B PLUS SIGN (+)
+const HYPHENMINUS = 0x002D; // U+002D HYPHEN-MINUS (-)
+
+const code = (type, value) => {
+    if (type === types.Delim) {
+        type = value;
+    }
+
+    if (typeof type === 'string') {
+        const charCode = type.charCodeAt(0);
+        return charCode > 0x7F ? 0x8000 : charCode << 8;
+    }
+
+    return type;
+};
+
+// https://www.w3.org/TR/css-syntax-3/#serialization
+// The only requirement for serialization is that it must "round-trip" with parsing,
+// that is, parsing the stylesheet must produce the same data structures as parsing,
+// serializing, and parsing again, except for consecutive <whitespace-token>s,
+// which may be collapsed into a single token.
+
+const specPairs = [
+    [types.Ident, types.Ident],
+    [types.Ident, types.Function],
+    [types.Ident, types.Url],
+    [types.Ident, types.BadUrl],
+    [types.Ident, '-'],
+    [types.Ident, types.Number],
+    [types.Ident, types.Percentage],
+    [types.Ident, types.Dimension],
+    [types.Ident, types.CDC],
+    [types.Ident, types.LeftParenthesis],
+
+    [types.AtKeyword, types.Ident],
+    [types.AtKeyword, types.Function],
+    [types.AtKeyword, types.Url],
+    [types.AtKeyword, types.BadUrl],
+    [types.AtKeyword, '-'],
+    [types.AtKeyword, types.Number],
+    [types.AtKeyword, types.Percentage],
+    [types.AtKeyword, types.Dimension],
+    [types.AtKeyword, types.CDC],
+
+    [types.Hash, types.Ident],
+    [types.Hash, types.Function],
+    [types.Hash, types.Url],
+    [types.Hash, types.BadUrl],
+    [types.Hash, '-'],
+    [types.Hash, types.Number],
+    [types.Hash, types.Percentage],
+    [types.Hash, types.Dimension],
+    [types.Hash, types.CDC],
+
+    [types.Dimension, types.Ident],
+    [types.Dimension, types.Function],
+    [types.Dimension, types.Url],
+    [types.Dimension, types.BadUrl],
+    [types.Dimension, '-'],
+    [types.Dimension, types.Number],
+    [types.Dimension, types.Percentage],
+    [types.Dimension, types.Dimension],
+    [types.Dimension, types.CDC],
+
+    ['#', types.Ident],
+    ['#', types.Function],
+    ['#', types.Url],
+    ['#', types.BadUrl],
+    ['#', '-'],
+    ['#', types.Number],
+    ['#', types.Percentage],
+    ['#', types.Dimension],
+    ['#', types.CDC], // https://github.com/w3c/csswg-drafts/pull/6874
+
+    ['-', types.Ident],
+    ['-', types.Function],
+    ['-', types.Url],
+    ['-', types.BadUrl],
+    ['-', '-'],
+    ['-', types.Number],
+    ['-', types.Percentage],
+    ['-', types.Dimension],
+    ['-', types.CDC], // https://github.com/w3c/csswg-drafts/pull/6874
+
+    [types.Number, types.Ident],
+    [types.Number, types.Function],
+    [types.Number, types.Url],
+    [types.Number, types.BadUrl],
+    [types.Number, types.Number],
+    [types.Number, types.Percentage],
+    [types.Number, types.Dimension],
+    [types.Number, '%'],
+    [types.Number, types.CDC], // https://github.com/w3c/csswg-drafts/pull/6874
+
+    ['@', types.Ident],
+    ['@', types.Function],
+    ['@', types.Url],
+    ['@', types.BadUrl],
+    ['@', '-'],
+    ['@', types.CDC], // https://github.com/w3c/csswg-drafts/pull/6874
+
+    ['.', types.Number],
+    ['.', types.Percentage],
+    ['.', types.Dimension],
+
+    ['+', types.Number],
+    ['+', types.Percentage],
+    ['+', types.Dimension],
+
+    ['/', '*']
+];
+// validate with scripts/generate-safe
+const safePairs = specPairs.concat([
+    [types.Ident, types.Hash],
+
+    [types.Dimension, types.Hash],
+
+    [types.Hash, types.Hash],
+
+    [types.AtKeyword, types.LeftParenthesis],
+    [types.AtKeyword, types.String],
+    [types.AtKeyword, types.Colon],
+
+    [types.Percentage, types.Percentage],
+    [types.Percentage, types.Dimension],
+    [types.Percentage, types.Function],
+    [types.Percentage, '-'],
+
+    [types.RightParenthesis, types.Ident],
+    [types.RightParenthesis, types.Function],
+    [types.RightParenthesis, types.Percentage],
+    [types.RightParenthesis, types.Dimension],
+    [types.RightParenthesis, types.Hash],
+    [types.RightParenthesis, '-']
+]);
+
+function createMap(pairs) {
+    const isWhiteSpaceRequired = new Set(
+        pairs.map(([prev, next]) => (code(prev) << 16 | code(next)))
+    );
+
+    return function(prevCode, type, value) {
+        const nextCode = code(type, value);
+        const nextCharCode = value.charCodeAt(0);
+        const emitWs =
+            (nextCharCode === HYPHENMINUS &&
+                type !== types.Ident &&
+                type !== types.Function &&
+                type !== types.CDC) ||
+            (nextCharCode === PLUSSIGN)
+                ? isWhiteSpaceRequired.has(prevCode << 16 | nextCharCode << 8)
+                : isWhiteSpaceRequired.has(prevCode << 16 | nextCode);
+
+        if (emitWs) {
+            this.emit(' ', types.WhiteSpace, true);
+        }
+
+        return nextCode;
+    };
+}
+
+const spec = createMap(specPairs);
+const safe = createMap(safePairs);
+
+exports.safe = safe;
+exports.spec = spec;