vendor tsgo

tools/tsgo/internal/jsnum/pseudobigint_test.go

@@ -0,0 +1,77 @@
+package jsnum
+
+import (
+	"strings"
+	"testing"
+
+	"gotest.tools/v3/assert"
+)
+
+func TestParsePseudoBigInt(t *testing.T) {
+	t.Parallel()
+
+	var testNumbers []Number
+	for i := range int64(1e3) {
+		testNumbers = append(testNumbers, Number(i))
+	}
+	for bits := range 53 {
+		testNumbers = append(testNumbers, Number(int64(1<<bits)), Number(int64(1<<bits)-1))
+	}
+
+	t.Run("strip base-10 strings", func(t *testing.T) {
+		t.Parallel()
+		for _, testNumber := range testNumbers {
+			for leadingZeros := range 10 {
+				assert.Equal(
+					t,
+					ParsePseudoBigInt(strings.Repeat("0", leadingZeros)+testNumber.String()+"n"),
+					testNumber.String(),
+				)
+			}
+		}
+	})
+
+	t.Run("parse non-decimal bases (small numbers)", func(t *testing.T) {
+		t.Parallel()
+
+		type tc struct {
+			lit string
+			out string
+		}
+		cases := []tc{
+			// binary
+			{lit: "0b0n", out: "0"},
+			{lit: "0b1n", out: "1"},
+			{lit: "0b1010n", out: "10"},
+			{lit: "0b1010_0101n", out: "165"},
+			{lit: "0B1101n", out: "13"}, // uppercase prefix
+
+			// octal
+			{lit: "0o0n", out: "0"},
+			{lit: "0o7n", out: "7"},
+			{lit: "0o755n", out: "493"},
+			{lit: "0o7_5_5n", out: "493"},
+			{lit: "0O12n", out: "10"}, // uppercase prefix
+
+			// hex
+			{lit: "0x0n", out: "0"},
+			{lit: "0xFn", out: "15"},
+			{lit: "0xFFn", out: "255"},
+			{lit: "0xF_Fn", out: "255"},
+			{lit: "0X1Fn", out: "31"}, // uppercase prefix
+		}
+
+		for _, c := range cases {
+			got := ParsePseudoBigInt(c.lit)
+			assert.Equal(t, got, c.out, "literal: %q", c.lit)
+		}
+	})
+
+	t.Run("can parse large literals", func(t *testing.T) {
+		t.Parallel()
+		assert.Equal(t, ParsePseudoBigInt("123456789012345678901234567890n"), "123456789012345678901234567890")
+		assert.Equal(t, ParsePseudoBigInt("0b1100011101110100100001111111101101100001101110011111000001110111001001110001111110000101011010010n"), "123456789012345678901234567890")
+		assert.Equal(t, ParsePseudoBigInt("0o143564417755415637016711617605322n"), "123456789012345678901234567890")
+		assert.Equal(t, ParsePseudoBigInt("0x18ee90ff6c373e0ee4e3f0ad2n"), "123456789012345678901234567890")
+	})
+}