Golang parser.Node類代碼示例

func (lp *LanguageParser) Parse() (*parser.Node, error) {
	sdata := string(lp.data)
	rn := parser.Node{P: lp, Name: lp.l.ScopeName}
	defer func() {
		if r := recover(); r != nil {
			log.Printf("Panic during parse: %v\n", r)
			log.Printf("%v", rn)
		}
	}()
	iter := maxiter
	for i := 0; i < len(sdata) && iter > 0; iter-- {
		pat, ret := lp.l.RootPattern.Cache(sdata, i)
		nl := strings.IndexAny(sdata[i:], "\n\r")
		if nl != -1 {
			nl += i
		}
		if ret == nil {
			break
		} else if nl > 0 && nl <= ret[0] {
			i = nl
			for i < len(sdata) && (sdata[i] == '\n' || sdata[i] == '\r') {
				i++
			}
		} else {
			n := pat.CreateNode(sdata, i, lp, ret)
			rn.Append(n)

			i = n.Range.B
		}
	}
	rn.UpdateRange()
	if len(sdata) != 0 {
		lut := make([]int, len(sdata)+1)
		j := 0
		for i := range sdata {
			lut[i] = j
			j++
		}
		lut[len(sdata)] = len(lp.data)
		lp.patch(lut, &rn)
	}
	if iter == 0 {
		panic("reached maximum number of iterations")
	}
	return &rn, nil
}

func (p *Pattern) CreateCaptureNodes(data string, pos int, d parser.DataSource, mo MatchObject, parent *parser.Node, capt Captures) {
	ranges := make([]text.Region, len(mo)/2)
	parentIndex := make([]int, len(ranges))
	parents := make([]*parser.Node, len(parentIndex))
	for i := range ranges {
		ranges[i] = text.Region{A: mo[i*2+0], B: mo[i*2+1]}
		if i < 2 {
			parents[i] = parent
			continue
		}
		r := ranges[i]
		for j := i - 1; j >= 0; j-- {
			if ranges[j].Covers(r) {
				parentIndex[i] = j
				break
			}
		}
	}

	for _, v := range capt {
		i := v.Key
		if i >= len(parents) || ranges[i].A == -1 {
			continue
		}
		child := &parser.Node{Name: v.Name, Range: ranges[i], P: d}
		parents[i] = child
		if i == 0 {
			parent.Append(child)
			continue
		}
		var p *parser.Node
		for p == nil {
			i = parentIndex[i]
			p = parents[i]
		}
		p.Append(child)
	}
}

func (c *Compiler) Recurse(node *parser.Node) string {
	ret := ""
	var cf parser.CodeFormatter
	p := primitives[node.Name]
	if p != "" {
		return p
	}

	switch node.Name {
	case "Identifier", "Boolean", "Float", "Integer":
		return node.Data()
	case "Text":
		return "\"" + node.Data() + "\""
	case "Comparison":
		a := c.Recurse(node.Children[0])
		cmp := c.Recurse(node.Children[1])
		b := c.Recurse(node.Children[2])
		return a + cmp + b
	case "While":
		return "while (" + c.Recurse(node.Children[0]) + ")\n" + c.Recurse(node.Children[1])
	case "If":
		return "if (" + c.Recurse(node.Children[0]) + ")\n" + c.Recurse(node.Children[1])
	case "ElseIf":
		ret += "else "
	case "Else":
		ret += "else\n"
	case "For":
		variable := c.Recurse(node.Children[0])
		array := c.Recurse(node.Children[1])
		block := c.Recurse(node.Children[2])

		typeName := "TODO"

		ret := "for (int i = 0; i < " + array + ".size(); i++)\n{\n\t"
		ret += typeName + " " + variable + " = " + array + "[i];\n"
		ret += block[2:]
		return ret
	case "NewStatement":
		return "new " + c.Recurse(node.Children[0])
	case "ReturnStatement":
		return "return " + c.Recurse(node.Children[0])
	case "ArrayIndexing":
		return c.Recurse(node.Children[0]) + "[" + c.Recurse(node.Children[1]) + "]"
	case "ArraySlicing":
		id := c.Recurse(node.Children[0])
		a := "0"
		b := id + ".size()"
		if node.Children[1].Name != "colon" {
			a = c.Recurse(node.Children[1])
		}
		back := node.Children[len(node.Children)-1]
		if back.Name != "colon" {
			b = c.Recurse(back)
		}
		return id + ".slice(" + a + ", " + b + ")"
	case "PostInc":
		return c.Recurse(node.Children[0]) + "++"
	case "PostDec":
		return c.Recurse(node.Children[0]) + "--"
	case "FunctionCall":
		ret = node.Children[0].Data()
		args := ""
		for _, child := range node.Children[1:] {
			if args != "" {
				args += ", "
			}
			args += c.Recurse(child)
		}

		return ret + "(" + args + ")"
	case "Class":
		cn := node.Children[0].Data()
		c.currentClass = cn
		cf.Add("class " + cn + "\n{\npublic:\n")
		cf.Inc()
		for _, child := range node.Children[1:] {
			ret := c.Recurse(child)
			if child.Name == "VariableDeclaration" {
				ret += ";\n"
			}
			cf.Add(ret)
		}
		cf.Dec()
		cf.Add("};\n")
		c.currentClass = ""
		return cf.String()
	case "Assignment":
		return node.Children[0].Data() + " = " + c.Recurse(node.Children[1])
	case "PlusEquals":
		return node.Children[0].Data() + " += " + c.Recurse(node.Children[1])
	case "VariableDeclaration":
		ret := c.ResolveType(node.Children[0]) + " "
		n1 := node.Children[1]
		if n1.Name == "Assignment" {
			ret += c.Recurse(n1)
		} else {
			ret += n1.Data()
		}
		return ret
	case "Block":
//.........這裏部分代碼省略.........

func (c *Compiler) ResolveType(node *parser.Node) string {
	if node.Name != "Type" {
		panic(node)
	}
	return node.Data()
}

func (c *PyCompiler) Recurse(node *parser.Node) string {
	ret := ""
	var cf parser.CodeFormatter
	p := pyprimitives[node.Name]
	if p != "" {
		return p
	}

	switch node.Name {
	case "Identifier", "Float", "Integer":
		return node.Data()
	case "Boolean":
		if node.Data() == "true" {
			return "True"
		} else {
			return "False"
		}
	case "Text":
		return "\"" + node.Data() + "\""
	case "Comparison":
		a := c.Recurse(node.Children[0])
		cmp := c.Recurse(node.Children[1])
		b := c.Recurse(node.Children[2])
		return a + cmp + b
	case "While":
		return "while " + c.Recurse(node.Children[0]) + ":\n" + c.Recurse(node.Children[1])
	case "If":
		return "if " + c.Recurse(node.Children[0]) + ":\n" + c.Recurse(node.Children[1])
	case "ElseIf":
		return "el" + c.Recurse(node.Children[0])
	case "Else":
		return "else:" + c.Recurse(node.Children[0])
	case "For":
		variable := c.Recurse(node.Children[0])
		array := c.Recurse(node.Children[1])
		block := c.Recurse(node.Children[2])

		return "for " + variable + " in " + array + ":\n" + block
	case "NewStatement":
		return c.Recurse(node.Children[0]) + "()"
	case "ReturnStatement":
		return "return " + c.Recurse(node.Children[0])
	case "ArrayIndexing":
		return c.Recurse(node.Children[0]) + "[" + c.Recurse(node.Children[1]) + "]"
	case "ArraySlicing":
		id := c.Recurse(node.Children[0])
		a := ""
		b := ""
		if node.Children[1].Name != "colon" {
			a = c.Recurse(node.Children[1])
		}
		back := node.Children[len(node.Children)-1]
		if back.Name != "colon" {
			b = c.Recurse(back)
		}
		return id + "[" + a + ":" + b + "]"
	case "PostInc":
		return c.Recurse(node.Children[0]) + " += 1"
	case "PostDec":
		return c.Recurse(node.Children[0]) + " -= 1"
	case "FunctionCall":
		ret = node.Children[0].Data()
		args := ""
		for _, child := range node.Children[1:] {
			if args != "" {
				args += ", "
			}
			args += c.Recurse(child)
		}

		return ret + "(" + args + ")"
	case "Class":
		cn := node.Children[0].Data()
		c.currentClass = cn
		cf.Add("class " + cn + ":\n")

		cf.Inc()
		for _, child := range node.Children[1:] {
			ret := c.Recurse(child)
			if child.Name == "VariableDeclaration" {
				ret += "\n"
			}
			cf.Add(ret)
		}
		cf.Dec()
		cf.Add("\n")
		c.currentClass = ""
		return cf.String()
	case "Assignment":
		return node.Children[0].Data() + " = " + c.Recurse(node.Children[1])
	case "PlusEquals":
		return node.Children[0].Data() + " += " + c.Recurse(node.Children[1])
	case "VariableDeclaration":
		ret := "" //c.ResolveType(node.Children[0]) + " "
		n1 := node.Children[1]
		if n1.Name == "Assignment" {
			ret += c.Recurse(n1)
		} else {
			ret += n1.Data()
		}
//.........這裏部分代碼省略.........