Calculator

Copy a sum from a spreadsheet, an invoice or a chat, and yabbistir tags it and pastes the answer.

Example

Copy 12 * 3 + 4: the item gets the calc tag, its preview shows Result: 40 and Expression: 12 * 3 + 4, and two actions are offered with the answer on the row:

• Paste result pastes 40.
• Paste expression = result pastes 12 * 3 + 4 = 40.

More that works: 15% of 80 (12), 80 + 15% (92), 80 * 15% (12), (2 + 3) × 4, 2^3^2 (512), 1.234,56 + 10 (1.244,56), sqrt(16) + 1, max(1, 7) - min(4; 2).

What it understands

• Numbers, + - * / × ÷ ^, % as percent or remainder, parentheses, unary minus. ^ is right to left and binds tighter than unary minus: 2^3^2 is 512, -2^2 is -4.
• Percentages: 15% of 80, 80 + 15% (80 plus 15% of 80), 80 - 15%, 80 * 15%. 10 % 3 (a space and an operand after it) is the remainder, 1.
• Functions: sqrt abs round floor ceil sin cos tan log ln exp min max. log is base 10, ln is natural, trigonometry is in radians, round(x; digits) takes an optional second argument. Separate arguments with ; or with a comma followed by a space (max(1, 2)); a comma with no space after it is a decimal comma.
• Constants pi (or π) and e.
• A trailing or leading = is ignored.

Number styles

Dot or comma decimals and thousands marks both work: 1.234,56 and 1,234.56. When a number is clear (1.234,56, 1,5, 1.5, 1.234.567) it is read as written. A single separator followed by exactly three digits (1.234, 1,234) is ambiguous, and the app's language decides: in English the comma is the thousands mark, in Turkish (and German, French and so on) the dot is. The answer is written in the style of the input: the same decimal mark, and with thousands marks when the input had them. The answer has at most 12 significant digits; very large or tiny answers use an exponent (1.26765060023e30).

What is not tagged

Anything that fails to parse: division by zero, overflow, unknown words, sqrt(-1). A lone number, a lone percentage or a lone constant (no operator), text over 5,000 characters, and text on several lines. Things that look like a sum but are not: dates (2024-11-04, 11/04/2024, 2024-11), phone numbers (555-123-4567, 555-1234), version strings (1.2.3), IP addresses, zero-padded numbers (007), times, 1920x1080.

Permissions

None. The extension reads only the item it is asked about. No network, no programs, no history.

How it works

A tokenizer and a recursive-descent parser that evaluates as it reads: no eval, no Function. Parsing is linear in the text and nesting is limited, so a very long or adversarial copy is rejected quickly (the detector has 50 ms).

Limits

• Write a subtraction of two plain numbers of three or more digits with spaces (555 - 1234): without spaces it is taken for a phone number or an identifier. Chains like 10-5-2 without spaces are taken for dates for the same reason; with spaces they are sums.
• Short joined pairs such as 2-1 or 10-12 (scores, page ranges, hours) and e-1 are not tagged; add spaces (2 - 1) to get a sum.
• A comma without a space is a decimal comma, so in an English app max(1,7) is not tagged; write max(1; 7) or max(1, 7). In Turkish max(1,7) is read as the single number 1,7.
• A bare function call such as sqrt(16) is tagged even without an operator; a remainder followed by a percent (5 % 2%) is not tagged.
• No implicit multiplication (2(3), 2pi), no x as times, no units or currencies, no scientific notation input (1e3).
• Numbers with spaces or apostrophes as thousands marks (1 234, 1'234) are not read.
• Floating point: results are rounded to 12 digits, so tiny differences (0.1 + 0.2) vanish.