Implemented unary operator parsing
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@ -157,6 +157,7 @@ This is what generates expressions from tokens.
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- [x] `<<=`, `>>=`
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- [x] `==`, `!=`, `<`, `<=`, `>`, `>=`
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- [x] `&&`, `||`
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- [ ] `!`, `-`
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### Architecture
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@ -17,17 +17,22 @@ func TestParse(t *testing.T) {
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}{
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{"Identity", "1", "1"},
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{"Basic calculation", "1+2", "(+ 1 2)"},
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{"Same operator", "1+2+3", "(+ (+ 1 2) 3)"},
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{"Same operator 2", "1+2+3+4", "(+ (+ (+ 1 2) 3) 4)"},
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{"Different operator", "1+2-3", "(- (+ 1 2) 3)"},
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{"Different operator 2", "1+2-3+4", "(+ (- (+ 1 2) 3) 4)"},
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{"Different operator 3", "1+2-3+4-5", "(- (+ (- (+ 1 2) 3) 4) 5)"},
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{"Grouped identity", "(1)", "1"},
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{"Grouped identity 2", "((1))", "1"},
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{"Grouped identity 3", "(((1)))", "1"},
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{"Adding identity", "(1)+(2)", "(+ 1 2)"},
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{"Adding identity 2", "(1)+(2)+(3)", "(+ (+ 1 2) 3)"},
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{"Adding identity 3", "(1)+(2)+(3)+(4)", "(+ (+ (+ 1 2) 3) 4)"},
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{"Grouping", "(1+2)", "(+ 1 2)"},
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{"Grouping 2", "(1+2+3)", "(+ (+ 1 2) 3)"},
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{"Grouping 3", "((1)+(2)+(3))", "(+ (+ 1 2) 3)"},
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@ -35,9 +40,11 @@ func TestParse(t *testing.T) {
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{"Grouping right", "1*(2+3)", "(* 1 (+ 2 3))"},
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{"Grouping same operator", "1+(2+3)", "(+ 1 (+ 2 3))"},
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{"Grouping same operator 2", "1+(2+3)+(4+5)", "(+ (+ 1 (+ 2 3)) (+ 4 5))"},
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{"Two groups", "(1+2)*(3+4)", "(* (+ 1 2) (+ 3 4))"},
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{"Two groups 2", "(1+2-3)*(3+4-5)", "(* (- (+ 1 2) 3) (- (+ 3 4) 5))"},
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{"Two groups 3", "(1+2)*(3+4-5)", "(* (+ 1 2) (- (+ 3 4) 5))"},
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{"Operator priority", "1+2*3", "(+ 1 (* 2 3))"},
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{"Operator priority 2", "1*2+3", "(+ (* 1 2) 3)"},
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{"Operator priority 3", "1+2*3+4", "(+ (+ 1 (* 2 3)) 4)"},
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@ -46,10 +53,25 @@ func TestParse(t *testing.T) {
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{"Operator priority 6", "1+2*3+4*5", "(+ (+ 1 (* 2 3)) (* 4 5))"},
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{"Operator priority 7", "1+2*3*4*5*6", "(+ 1 (* (* (* (* 2 3) 4) 5) 6))"},
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{"Operator priority 8", "1*2*3+4*5*6", "(+ (* (* 1 2) 3) (* (* 4 5) 6))"},
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{"Complex", "(1+2-3*4)*(5+6-7*8)", "(* (- (+ 1 2) (* 3 4)) (- (+ 5 6) (* 7 8)))"},
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{"Complex 2", "(1+2*3-4)*(5+6*7-8)", "(* (- (+ 1 (* 2 3)) 4) (- (+ 5 (* 6 7)) 8))"},
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{"Complex 3", "(1+2*3-4)*(5+6*7-8)+9-10*11", "(- (+ (* (- (+ 1 (* 2 3)) 4) (- (+ 5 (* 6 7)) 8)) 9) (* 10 11))"},
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{"Unary", "!", "!"},
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{"Unary not", "!", "!"},
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{"Unary not 2", "!a", "(! a)"},
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{"Unary not 3", "!(!a)", "(! (! a))"},
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{"Unary not 4", "!(a||b)", "(! (|| a b))"},
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{"Unary not 5", "a || !b", "(|| a (! b))"},
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{"Unary minus", "-", "-"},
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{"Unary minus 2", "-a", "(- a)"},
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{"Unary minus 3", "-(-a)", "(- (- a))"},
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{"Unary minus 4", "-a+b", "(+ (- a) b)"},
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{"Unary minus 5", "-(a+b)", "(- (+ a b))"},
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{"Unary minus 6", "a + -b", "(+ a (- b))"},
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{"Unary minus 7", "-a + -b", "(+ (- a) (- b))"},
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{"Function calls", "a()", "(λ a)"},
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{"Function calls 2", "a(1)", "(λ a 1)"},
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{"Function calls 3", "a(1)+1", "(+ (λ a 1) 1)"},
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@ -77,8 +99,10 @@ func TestParse(t *testing.T) {
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{"Function calls 25", "a(1-2*3)", "(λ a (- 1 (* 2 3)))"},
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{"Function calls 26", "1+2*a()+4", "(+ (+ 1 (* 2 (λ a))) 4)"},
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{"Function calls 27", "sum(a,b)*2+15*4", "(+ (* (λ sum a b) 2) (* 15 4))"},
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{"Package function calls", "math.sum(a,b)", "(λ (. math sum) a b)"},
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{"Package function calls 2", "generic.math.sum(a,b)", "(λ (. (. generic math) sum) a b)"},
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{"Array access", "a[0]", "(@ a 0)"},
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{"Array access 2", "a[b+c]", "(@ a (+ b c))"},
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{"Array access 3", "a.b[c]", "(@ (. a b) c)"},
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@ -10,7 +10,7 @@ import (
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type Operator struct {
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Symbol string
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Precedence int8
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Operands int
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Operands int8
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}
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// Operators defines the operators used in the language.
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@ -19,6 +19,7 @@ var Operators = map[token.Kind]*Operator{
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token.Period: {".", 13, 2},
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token.Call: {"λ", 12, 1},
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token.Array: {"@", 12, 2},
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token.Negate: {"-", 11, 1},
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token.Not: {"!", 11, 1},
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token.Mul: {"*", 10, 2},
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token.Div: {"/", 10, 2},
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@ -73,7 +74,7 @@ func numOperands(symbol token.Kind) int {
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return -1
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}
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return operator.Operands
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return int(operator.Operands)
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}
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func precedence(symbol token.Kind) int8 {
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@ -117,7 +117,11 @@ func Parse(tokens []token.Token) *Expression {
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newPrecedence := node.Precedence
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if newPrecedence > oldPrecedence {
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cursor.LastChild().Replace(node)
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if len(cursor.Children) == numOperands(cursor.Token.Kind) {
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cursor.LastChild().Replace(node)
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} else {
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cursor.AddChild(node)
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}
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} else {
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start := cursor
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@ -38,10 +38,11 @@ const (
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Shr // >>
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LogicalAnd // &&
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LogicalOr // ||
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Not // ! (unary)
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Negate // - (unary)
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Equal // ==
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Less // <
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Greater // >
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Not // !
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NotEqual // !=
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LessEqual // <=
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GreaterEqual // >=
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@ -28,6 +28,11 @@ func (t Token) IsAssignment() bool {
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return t.Kind > _assignments && t.Kind < _assignmentsEnd
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}
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// IsExpressionStart returns true if the token starts an expression.
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func (t Token) IsExpressionStart() bool {
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return t.Kind == GroupStart || t.Kind == ArrayStart || t.Kind == BlockStart
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}
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// IsKeyword returns true if the token is a keyword.
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func (t Token) IsKeyword() bool {
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return t.Kind > _keywords && t.Kind < _keywordsEnd
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@ -26,8 +26,28 @@ func Tokenize(buffer []byte) List {
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tokens = append(tokens, Token{Kind: ArrayEnd, Position: i, Length: 1})
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case '\n':
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tokens = append(tokens, Token{Kind: NewLine, Position: i, Length: 1})
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case '-':
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if len(tokens) == 0 || tokens[len(tokens)-1].IsOperator() || tokens[len(tokens)-1].IsExpressionStart() {
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tokens = append(tokens, Token{Kind: Negate, Position: i, Length: 1})
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} else {
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if i+1 < Position(len(buffer)) && buffer[i+1] == '=' {
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tokens = append(tokens, Token{Kind: SubAssign, Position: i, Length: 2})
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i++
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} else {
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tokens = append(tokens, Token{Kind: Sub, Position: i, Length: 1})
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}
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}
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case '/':
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if i+1 >= Position(len(buffer)) || buffer[i+1] != '/' {
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if i+1 < Position(len(buffer)) && buffer[i+1] == '/' {
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position := i
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for i < Position(len(buffer)) && buffer[i] != '\n' {
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i++
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}
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tokens = append(tokens, Token{Kind: Comment, Position: position, Length: Length(i - position)})
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} else {
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position := i
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i++
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@ -45,14 +65,6 @@ func Tokenize(buffer []byte) List {
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}
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tokens = append(tokens, Token{Kind: kind, Position: position, Length: Length(i - position)})
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} else {
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position := i
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for i < Position(len(buffer)) && buffer[i] != '\n' {
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i++
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}
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tokens = append(tokens, Token{Kind: Comment, Position: position, Length: Length(i - position)})
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}
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continue
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@ -83,13 +83,81 @@ func TestNumber(t *testing.T) {
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}
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func TestOperator(t *testing.T) {
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tokens := token.Tokenize([]byte(`+ - * /`))
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tokens := token.Tokenize([]byte(`a + b - c * d / e`))
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expected := []token.Kind{
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token.Identifier,
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token.Add,
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token.Identifier,
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token.Sub,
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token.Identifier,
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token.Mul,
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token.Identifier,
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token.Div,
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token.Identifier,
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token.EOF,
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}
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for i, kind := range expected {
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assert.Equal(t, tokens[i].Kind, kind)
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}
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}
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func TestNegateFirstToken(t *testing.T) {
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tokens := token.Tokenize([]byte(`-a`))
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expected := []token.Kind{
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token.Negate,
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token.Identifier,
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token.EOF,
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}
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for i, kind := range expected {
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assert.Equal(t, tokens[i].Kind, kind)
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}
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}
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func TestNegateAfterGroupStart(t *testing.T) {
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tokens := token.Tokenize([]byte(`(-a)`))
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expected := []token.Kind{
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token.GroupStart,
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token.Negate,
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token.Identifier,
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token.GroupEnd,
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token.EOF,
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}
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for i, kind := range expected {
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assert.Equal(t, tokens[i].Kind, kind)
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}
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}
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func TestNegateSub(t *testing.T) {
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tokens := token.Tokenize([]byte(`-a-b`))
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expected := []token.Kind{
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token.Negate,
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token.Identifier,
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token.Sub,
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token.Identifier,
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token.EOF,
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}
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for i, kind := range expected {
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assert.Equal(t, tokens[i].Kind, kind)
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}
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}
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func TestNegateAfterOperator(t *testing.T) {
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tokens := token.Tokenize([]byte(`-a + -b`))
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expected := []token.Kind{
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token.Negate,
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token.Identifier,
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token.Add,
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token.Negate,
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token.Identifier,
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token.EOF,
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}
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@ -99,18 +167,28 @@ func TestOperator(t *testing.T) {
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}
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func TestOperatorAssign(t *testing.T) {
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tokens := token.Tokenize([]byte(`+= -= *= /= &= |= ^= <<= >>=`))
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tokens := token.Tokenize([]byte(`a += b -= c *= d /= e &= f |= g ^= h <<= i >>= j`))
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expected := []token.Kind{
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token.Identifier,
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token.AddAssign,
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token.Identifier,
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token.SubAssign,
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token.Identifier,
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token.MulAssign,
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token.Identifier,
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token.DivAssign,
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token.Identifier,
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token.AndAssign,
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token.Identifier,
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token.OrAssign,
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token.Identifier,
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token.XorAssign,
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token.Identifier,
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token.ShlAssign,
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token.Identifier,
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token.ShrAssign,
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token.Identifier,
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token.EOF,
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}
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