Spreadsheet: Start making a spreadsheet application

Base/res/js/Spreadsheet/runtime.js

@@ -0,0 +1,93 @@
+const sheet = this
+
+function range(start, end, column_step, row_step) {
+    column_step = integer(column_step ?? 1)
+    row_step = integer(row_step ?? 1)
+    start = sheet.parse_cell_name(start) ?? {column: 'A', row: 0}
+    end = sheet.parse_cell_name(end) ?? start
+
+    if (end.column.length > 1 || start.column.length > 1)
+        throw new TypeError("Only single-letter column names are allowed (TODO)");
+
+    const cells = []
+
+    for (let col = Math.min(start.column.charCodeAt(0), end.column.charCodeAt(0));
+        col <= Math.max(start.column.charCodeAt(0), end.column.charCodeAt(0));
+        ++col) {
+        for (let row = Math.min(start.row, end.row);
+            row <= Math.max(start.row, end.row);
+            ++row) {
+
+            cells.push(String.fromCharCode(col) + row)
+        }
+    }
+
+    return cells
+}
+
+// FIXME: Remove this and use String.split() eventually
+function split(str, sep) {
+    const parts = []
+    let split_index = -1
+    for(;;) {
+        split_index = str.indexOf(sep)
+        if (split_index == -1) {
+            if (str.length)
+                parts.push(str)
+            return parts
+        }
+        parts.push(str.substring(0, split_index))
+        str = str.slice(split_index + sep.length)
+    }
+}
+
+function R(fmt, ...args) {
+    if (args.length !== 0)
+        throw new TypeError("R`` format must be literal")
+
+    fmt = fmt[0]
+    return range(...split(fmt, ':'))
+}
+
+function select(criteria, t, f) {
+    if (criteria)
+        return t;
+    return f;
+}
+
+function sumif(condition, cells) {
+    let sum = null
+    for (let name of cells) {
+        let cell = sheet[name]
+        if (condition(cell))
+            sum = sum === null ? cell : sum + cell
+    }
+    return sum
+}
+
+function countif(condition, cells) {
+    let count = 0
+    for (let name of cells) {
+        let cell = sheet[name]
+        if (condition(cell))
+            count++
+    }
+    return count
+}
+
+function now() {
+    return new Date()
+}
+
+function repeat(count, str) {
+    return Array(count + 1).join(str)
+}
+
+function randrange(min, max) {
+    return Math.random() * (max - min) + min
+}
+
+function integer(value) {
+    return value | 0
+}
+