Golang Parser.Error方法代码示例

// Creates an assign tag
func CaptureFactory(p *core.Parser, config *core.Configuration) (core.Tag, error) {
	name := p.ReadName()
	if len(name) == 0 {
		return nil, p.Error("Invalid assignment, variable not found. ")
	}
	p.SkipPastTag()
	return &Capture{name, config, NewCommon()}, nil
}

func ForFactory(p *core.Parser, config *core.Configuration) (core.Tag, error) {
	name := p.ReadName()
	if len(name) == 0 {
		return nil, p.Error("Invalid variable name in for tag")
	}
	if p.SkipSpaces() != 'i' || p.Left() < 3 || p.Data[p.Position+1] != 'n' || !core.IsTokenEnd(p.Data[p.Position+2]) {
		return nil, p.Error("Expecting keyword 'in' after variable name in for tag")
	}
	p.ForwardBy(2)

	value, err := p.ReadValue()
	if err != nil {
		return nil, err
	}

	f := &For{
		Common:    NewCommon(),
		name:      name,
		keyName:   name + "[0]",
		valueName: name + "[1]",
		value:     value,
	}

	for {
		name := p.ReadName()
		if name == "" {
			break
		}
		if name == "limit" {
			if p.SkipUntil(':') != ':' {
				return nil, p.Error("Expecting ':' after limit in for tag")
			}
			p.Forward()
			limit, err := p.ReadValue()
			if err != nil {
				return nil, err
			}
			f.limit = limit
		} else if name == "offset" {
			if p.SkipUntil(':') != ':' {
				return nil, p.Error("Expecting ':' after offset in for tag")
			}
			p.Forward()
			offset, err := p.ReadValue()
			if err != nil {
				return nil, err
			}
			f.offset = offset
		} else if name == "reverse" {
			f.reverse = true
		} else {
			return nil, p.Error(fmt.Sprint("%q is an inknown modifier in for tag", name))
		}
	}
	p.SkipPastTag()
	return f, nil
}

func newTag(p *core.Parser, config *core.Configuration) (core.Tag, error) {
	p.ForwardBy(2) // skip the {%
	name := p.ReadName()
	factory, ok := Tags[name]
	if ok == false {
		return nil, p.Error(fmt.Sprintf("unknown tag %q", name))
	}
	return factory(p, config)
}

// Creates an include tag
func IncludeFactory(p *core.Parser, config *core.Configuration) (core.Tag, error) {
	value, err := p.ReadValue()
	if err != nil {
		return nil, err
	}
	if value == nil {
		return nil, p.Error("Invalid include value")
	}
	p.SkipPastTag()
	return &Include{value, config.GetIncludeHandler()}, nil
}

func extractTokens(parser *core.Parser, container core.Tag, config *core.Configuration) error {
	stack := make([]core.Tag, 0, 0)
	parentContainer := container
	for parser.HasMore() {
		pre, markupType := parser.ToMarkup()
		if len(pre) > 0 {
			container.AddCode(newLiteral(pre))
		}
		if markupType == core.OutputMarkup {
			code, err := newOutput(parser)
			if err != nil {
				return err
			}
			if code != nil {
				container.AddCode(code)
			}
		} else if markupType == core.TagMarkup {
			tag, err := newTag(parser, config)
			if err != nil {
				return err
			}
			switch tag.Type() {
			case core.ContainerTag, core.LoopTag:
				container.AddCode(tag)
				stack = append(stack, container)
				container = tag
				parentContainer = tag
			case core.EndTag:
				if tag.Name() != parentContainer.Name() {
					return parser.Error("unexpected end tag")
				}
				l := len(stack) - 1
				container = stack[l]
				parentContainer = nil
				stack = stack[0:l]
				parser.SkipPastTag()
			case core.SiblingTag:
				if err := parentContainer.AddSibling(tag); err != nil {
					return err
				}
				container = tag
			case core.StandaloneTag:
				container.AddCode(tag)
			}
		} else {
			break
		}
	}
	return nil
}

func extractTokens(parser *core.Parser, container core.Tag, config *core.Configuration) error {
	stack := []core.Tag{container}
	preserveWhiteSpace := config.GetPreserveWhitespace()
	for parser.HasMore() {
		pre, markupType := parser.ToMarkup(preserveWhiteSpace)
		if len(pre) > 0 {
			container.AddCode(newLiteral(pre))
		}
		if markupType == core.OutputMarkup {
			code, err := newOutput(parser)
			if err != nil {
				return err
			}
			if code != nil {
				container.AddCode(code)
			}
		} else if markupType == core.TagMarkup {
			tag, err := newTag(parser, config)
			if err != nil {
				return err
			}
			switch tag.Type() {
			case core.ContainerTag, core.LoopTag:
				container.AddCode(tag)
				container = tag
				stack = append(stack, container)
			case core.EndTag:
				l := len(stack) - 1
				container = stack[l]
				if tag.Name() != container.Name() {
					return parser.Error(fmt.Sprintf("end tag \"end%s\" cannot terminate %q", tag.Name(), container.Name()))
				}
				stack = stack[0:l]
				container = stack[l-1]
				parser.SkipPastTag()
			case core.SiblingTag:
				if err := stack[len(stack)-1].AddSibling(tag); err != nil {
					return err
				}
				container = tag
			case core.StandaloneTag:
				container.AddCode(tag)
			}
		} else {
			break
		}
	}
	return nil
}

// Creates an assign tag
func AssignFactory(p *core.Parser, config *core.Configuration) (core.Tag, error) {
	name := p.ReadName()
	if len(name) == 0 {
		return nil, p.Error("Invalid variable name in assign tag")
	}
	if p.SkipUntil('=') != '=' {
		return nil, p.Error("Invalid assign, missing '=' ")
	}
	p.Forward()
	value, err := p.ReadValue()
	if err != nil {
		return nil, err
	}
	filters, err := p.ReadFilters()
	if err != nil {
		return nil, err
	}
	p.SkipPastTag()
	return &Assign{name, value, filters}, nil
}