63 lines
2.4 KiB
Go
63 lines
2.4 KiB
Go
package runtime_test
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import (
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"fmt"
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"testing"
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)
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func TestString(t *testing.T) {
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expect(t, `out = "Hello World!"`, "Hello World!")
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expect(t, `out = "Hello" + " " + "World!"`, "Hello World!")
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expect(t, `out = "Hello" == "Hello"`, true)
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expect(t, `out = "Hello" == "World"`, false)
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expect(t, `out = "Hello" != "Hello"`, false)
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expect(t, `out = "Hello" != "World"`, true)
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// index operator
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str := "abcdef"
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strStr := `"abcdef"`
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strLen := 6
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for idx := 0; idx < strLen; idx++ {
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expect(t, fmt.Sprintf("out = %s[%d]", strStr, idx), str[idx])
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expect(t, fmt.Sprintf("out = %s[0 + %d]", strStr, idx), str[idx])
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expect(t, fmt.Sprintf("out = %s[1 + %d - 1]", strStr, idx), str[idx])
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expect(t, fmt.Sprintf("idx := %d; out = %s[idx]", idx, strStr), str[idx])
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}
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expectError(t, fmt.Sprintf("%s[%d]", strStr, -1))
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expectError(t, fmt.Sprintf("%s[%d]", strStr, strLen))
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// slice operator
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for low := 0; low < strLen; low++ {
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for high := low; high <= strLen; high++ {
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expect(t, fmt.Sprintf("out = %s[%d:%d]", strStr, low, high), str[low:high])
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expect(t, fmt.Sprintf("out = %s[0 + %d : 0 + %d]", strStr, low, high), str[low:high])
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expect(t, fmt.Sprintf("out = %s[1 + %d - 1 : 1 + %d - 1]", strStr, low, high), str[low:high])
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expect(t, fmt.Sprintf("out = %s[:%d]", strStr, high), str[:high])
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expect(t, fmt.Sprintf("out = %s[%d:]", strStr, low), str[low:])
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expect(t, fmt.Sprintf("out = %s[:]", strStr), str[:])
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}
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}
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expectError(t, fmt.Sprintf("%s[%d:]", strStr, -1))
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expectError(t, fmt.Sprintf("%s[:%d]", strStr, strLen+1))
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expectError(t, fmt.Sprintf("%s[%d:%d]", strStr, 2, 1))
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// string concatenation with other types
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expect(t, `out = "foo" + 1`, "foo1")
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// Float.String() returns the smallest number of digits
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// necessary such that ParseFloat will return f exactly.
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expect(t, `out = "foo" + 1.0`, "foo1") // <- note '1' instead of '1.0'
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expect(t, `out = "foo" + 1.5`, "foo1.5")
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expect(t, `out = "foo" + true`, "footrue")
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expect(t, `out = "foo" + 'X'`, "fooX")
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expect(t, `out = "foo" + error(5)`, "fooerror: 5")
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expect(t, `out = "foo" + undefined`, "foo<undefined>")
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expect(t, `out = "foo" + [1,2,3]`, "foo[1, 2, 3]")
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//expect(t, `out = "foo" + {a: 1, b: 2}`, "foo{a: 1, b: 2}") // TODO: commented because order of key is not consistent
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// also works with "+=" operator
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expect(t, `out = "foo"; out += 1.5`, "foo1.5")
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// string concats works only when string is LHS
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expectError(t, `1 + "foo"`)
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expectError(t, `"foo" - "bar"`)
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}
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