1 files changed, 59 insertions, 0 deletions
diff --git a/node_modules/css-tree/lib/syntax/node/Ratio.js b/node_modules/css-tree/lib/syntax/node/Ratio.js
new file mode 100644
index 00000000..c2e08a51
--- /dev/null
+++ b/node_modules/css-tree/lib/syntax/node/Ratio.js
@@ -0,0 +1,59 @@
+import { isDigit, Delim, Number as NumberToken } from '../../tokenizer/index.js';
+
+const SOLIDUS = 0x002F;  // U+002F SOLIDUS (/)
+const FULLSTOP = 0x002E; // U+002E FULL STOP (.)
+
+// Terms of <ratio> should be a positive numbers (not zero or negative)
+// (see https://drafts.csswg.org/mediaqueries-3/#values)
+// However, -o-min-device-pixel-ratio takes fractional values as a ratio's term
+// and this is using by various sites. Therefore we relax checking on parse
+// to test a term is unsigned number without an exponent part.
+// Additional checking may be applied on lexer validation.
+function consumeNumber() {
+    this.skipSC();
+
+    const value = this.consume(NumberToken);
+
+    for (let i = 0; i < value.length; i++) {
+        const code = value.charCodeAt(i);
+        if (!isDigit(code) && code !== FULLSTOP) {
+            this.error('Unsigned number is expected', this.tokenStart - value.length + i);
+        }
+    }
+
+    if (Number(value) === 0) {
+        this.error('Zero number is not allowed', this.tokenStart - value.length);
+    }
+
+    return value;
+}
+
+export const name = 'Ratio';
+export const structure = {
+    left: String,
+    right: String
+};
+
+// <positive-integer> S* '/' S* <positive-integer>
+export function parse() {
+    const start = this.tokenStart;
+    const left = consumeNumber.call(this);
+    let right;
+
+    this.skipSC();
+    this.eatDelim(SOLIDUS);
+    right = consumeNumber.call(this);
+
+    return {
+        type: 'Ratio',
+        loc: this.getLocation(start, this.tokenStart),
+        left,
+        right
+    };
+}
+
+export function generate(node) {
+    this.token(NumberToken, node.left);
+    this.token(Delim, '/');
+    this.token(NumberToken, node.right);
+}