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67 lines
1.3 KiB
67 lines
1.3 KiB
package main |
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import ( |
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"os" |
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"github.com/01-edu/z01" |
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) |
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const SIZE = 2048 |
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func main() { |
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if len(os.Args) != 2 { |
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return |
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} |
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progpoint := []byte(os.Args[1]) |
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var arby [SIZE]byte |
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pos := 0 |
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openBr := 0 // opened brackets |
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i := 0 // iterates through the source code passed in the argument |
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N := len(progpoint) // length of the source code |
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for i >= 0 && i < N { |
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switch progpoint[i] { |
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case '>': |
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// Increment the pointer |
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pos++ |
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case '<': |
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// decrement the pointes |
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pos-- |
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case '+': |
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// increment the pointed byte |
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arby[pos]++ |
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case '-': |
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// decrement the pointed byte |
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arby[pos]-- |
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case '.': |
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// print the pointed byte on std output |
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z01.PrintRune(rune(arby[pos])) |
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case '[': |
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// go to the matching ']' if the pointed byte is 0 (while start) |
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openBr = 0 |
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if arby[pos] == 0 { |
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for i < N && (progpoint[i] != byte(']') || openBr > 1) { |
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if progpoint[i] == byte('[') { |
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openBr++ |
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} else if progpoint[i] == byte(']') { |
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openBr-- |
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} |
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i++ |
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} |
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} |
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case ']': |
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// go to the matching '[' if the pointed byte is not 0 (while end) |
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openBr = 0 |
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if arby[pos] != 0 { |
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for i >= 0 && (progpoint[i] != byte('[') || openBr > 1) { |
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if progpoint[i] == byte(']') { |
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openBr++ |
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} else if progpoint[i] == byte('[') { |
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openBr-- |
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} |
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i-- |
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} |
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} |
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} |
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i++ |
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} |
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}
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