amber/parser/nodes.go

package parser

import (
        "regexp"
        "strings"
)

var selfClosingTags = [...]string{
        "meta",
        "img",
        "link",
        "input",
        "source",
        "area",
        "base",
        "col",
        "br",
        "hr",
}

var doctypes = map[string]string{
        "5":            `<!DOCTYPE html>`,
        "default":      `<!DOCTYPE html>`,
        "xml":          `<?xml version="1.0" encoding="utf-8" ?>`,
        "transitional": `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">`,
        "strict":       `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">`,
        "frameset":     `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">`,
        "1.1":          `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">`,
        "basic":        `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN" "http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">`,
        "mobile":       `<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.2//EN" "http://www.openmobilealliance.org/tech/DTD/xhtml-mobile12.dtd">`,
}

type Node interface {
        Pos() SourcePosition
}

type SourcePosition struct {
        LineNum     int
        ColNum      int
        TokenLength int
        Filename    string
}

func (s *SourcePosition) Pos() SourcePosition {
        return *s
}

type Doctype struct {
        SourcePosition
        Value string
}

func newDoctype(value string) *Doctype {
        dt := new(Doctype)
        dt.Value = value
        return dt
}

func (d *Doctype) String() string {
        if defined := doctypes[d.Value]; len(defined) != 0 {
                return defined
        }

        return `<!DOCTYPE ` + d.Value + `>`
}

type Comment struct {
        SourcePosition
        Value  string
        Block  *Block
        Silent bool
}

func newComment(value string) *Comment {
        dt := new(Comment)
        dt.Value = value
        dt.Block = nil
        dt.Silent = false
        return dt
}

type Text struct {
        SourcePosition
        Value string
        Raw   bool
}

func newText(value string, raw bool) *Text {
        dt := new(Text)
        dt.Value = value
        dt.Raw = raw
        return dt
}

type Block struct {
        SourcePosition
        Children []Node
}

func newBlock() *Block {
        block := new(Block)
        block.Children = make([]Node, 0)
        return block
}

func (b *Block) push(node Node) {
        b.Children = append(b.Children, node)
}

func (b *Block) pushFront(node Node) {
        b.Children = append([]Node{node}, b.Children...)
}

func (b *Block) CanInline() bool {
        if len(b.Children) == 0 {
                return true
        }

        allText := true

        for _, child := range b.Children {
                if txt, ok := child.(*Text); !ok || txt.Raw {
                        allText = false
                        break
                }
        }

        return allText
}

const (
        NamedBlockDefault = iota
        NamedBlockAppend
        NamedBlockPrepend
)

type NamedBlock struct {
        Block
        Name     string
        Modifier int
}

func newNamedBlock(name string) *NamedBlock {
        bb := new(NamedBlock)
        bb.Name = name
        bb.Block.Children = make([]Node, 0)
        bb.Modifier = NamedBlockDefault
        return bb
}

type Attribute struct {
        SourcePosition
        Name      string
        Value     string
        IsRaw     bool
        Condition string
}

type Tag struct {
        SourcePosition
        Block          *Block
        Name           string
        IsInterpolated bool
        Attributes     []Attribute
}

func newTag(name string) *Tag {
        tag := new(Tag)
        tag.Block = nil
        tag.Name = name
        tag.Attributes = make([]Attribute, 0)
        tag.IsInterpolated = false
        return tag

}

func (t *Tag) IsSelfClosing() bool {
        for _, tag := range selfClosingTags {
                if tag == t.Name {
                        return true
                }
        }

        return false
}

func (t *Tag) IsRawText() bool {
        return t.Name == "style" || t.Name == "script"
}

type Condition struct {
        SourcePosition
        Positive   *Block
        Negative   *Block
        Expression string
}

func newCondition(exp string) *Condition {
        cond := new(Condition)
        cond.Expression = exp
        return cond
}

type Each struct {
        SourcePosition
        X          string
        Y          string
        Expression string
        Block      *Block
}

func newEach(exp string) *Each {
        each := new(Each)
        each.Expression = exp
        return each
}

type Assignment struct {
        SourcePosition
        X          string
        Expression string
}

func newAssignment(x, expression string) *Assignment {
        assgn := new(Assignment)
        assgn.X = x
        assgn.Expression = expression
        return assgn
}

type Mixin struct {
        SourcePosition
        Block *Block
        Name  string
        Args  []string
}

func newMixin(name, args string) *Mixin {
        mixin := new(Mixin)
        mixin.Name = name

        delExp := regexp.MustCompile(`,\s`)
        mixin.Args = delExp.Split(args, -1)

        for i := 0; i < len(mixin.Args); i++ {
                mixin.Args[i] = strings.TrimSpace(mixin.Args[i])
                if mixin.Args[i] == "" {
                        mixin.Args = append(mixin.Args[:i], mixin.Args[i+1:]...)
                        i--
                }
        }

        return mixin
}

type MixinCall struct {
        SourcePosition
        Name string
        Args []string
}

func newMixinCall(name, args string) *MixinCall {
        mixinCall := new(MixinCall)
        mixinCall.Name = name

        if args != "" {
                const t = "%s"
                quoteExp := regexp.MustCompile(`"(.*?)"`)
                delExp := regexp.MustCompile(`,\s`)

                quotes := quoteExp.FindAllString(args, -1)
                replaced := quoteExp.ReplaceAllString(args, t)
                mixinCall.Args = delExp.Split(replaced, -1)

                qi := 0
                for i, arg := range mixinCall.Args {
                        if arg == t {
                                mixinCall.Args[i] = quotes[qi]
                                qi++
                        }
                }
        }

        return mixinCall
}
1	package parser
2
3	import (
4	"regexp"
5	"strings"
6	)
7
8	var selfClosingTags = [...]string{
9	"meta",
10	"img",
11	"link",
12	"input",
13	"source",
14	"area",
15	"base",
16	"col",
17	"br",
18	"hr",
19	}
20
21	var doctypes = map[string]string{
22	"5": `<!DOCTYPE html>`,
23	"default": `<!DOCTYPE html>`,
24	"xml": `<?xml version="1.0" encoding="utf-8" ?>`,
25	"transitional": `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">`,
26	"strict": `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">`,
27	"frameset": `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">`,
28	"1.1": `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">`,
29	"basic": `<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN" "http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">`,
30	"mobile": `<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.2//EN" "http://www.openmobilealliance.org/tech/DTD/xhtml-mobile12.dtd">`,
31	}
32
33	type Node interface {
34	Pos() SourcePosition
35	}
36
37	type SourcePosition struct {
38	LineNum int
39	ColNum int
40	TokenLength int
41	Filename string
42	}
43
44	func (s *SourcePosition) Pos() SourcePosition {
45	return *s
46	}
47
48	type Doctype struct {
49	SourcePosition
50	Value string
51	}
52
53	func newDoctype(value string) *Doctype {
54	dt := new(Doctype)
55	dt.Value = value
56	return dt
57	}
58
59	func (d *Doctype) String() string {
60	if defined := doctypes[d.Value]; len(defined) != 0 {
61	return defined
62	}
63
64	return `<!DOCTYPE ` + d.Value + `>`
65	}
66
67	type Comment struct {
68	SourcePosition
69	Value string
70	Block *Block
71	Silent bool
72	}
73
74	func newComment(value string) *Comment {
75	dt := new(Comment)
76	dt.Value = value
77	dt.Block = nil
78	dt.Silent = false
79	return dt
80	}
81
82	type Text struct {
83	SourcePosition
84	Value string
85	Raw bool
86	}
87
88	func newText(value string, raw bool) *Text {
89	dt := new(Text)
90	dt.Value = value
91	dt.Raw = raw
92	return dt
93	}
94
95	type Block struct {
96	SourcePosition
97	Children []Node
98	}
99
100	func newBlock() *Block {
101	block := new(Block)
102	block.Children = make([]Node, 0)
103	return block
104	}
105
106	func (b *Block) push(node Node) {
107	b.Children = append(b.Children, node)
108	}
109
110	func (b *Block) pushFront(node Node) {
111	b.Children = append([]Node{node}, b.Children...)
112	}
113
114	func (b *Block) CanInline() bool {
115	if len(b.Children) == 0 {
116	return true
117	}
118
119	allText := true
120
121	for _, child := range b.Children {
122	if txt, ok := child.(*Text); !ok \|\| txt.Raw {
123	allText = false
124	break
125	}
126	}
127
128	return allText
129	}
130
131	const (
132	NamedBlockDefault = iota
133	NamedBlockAppend
134	NamedBlockPrepend
135	)
136
137	type NamedBlock struct {
138	Block
139	Name string
140	Modifier int
141	}
142
143	func newNamedBlock(name string) *NamedBlock {
144	bb := new(NamedBlock)
145	bb.Name = name
146	bb.Block.Children = make([]Node, 0)
147	bb.Modifier = NamedBlockDefault
148	return bb
149	}
150
151	type Attribute struct {
152	SourcePosition
153	Name string
154	Value string
155	IsRaw bool
156	Condition string
157	}
158
159	type Tag struct {
160	SourcePosition
161	Block *Block
162	Name string
163	IsInterpolated bool
164	Attributes []Attribute
165	}
166
167	func newTag(name string) *Tag {
168	tag := new(Tag)
169	tag.Block = nil
170	tag.Name = name
171	tag.Attributes = make([]Attribute, 0)
172	tag.IsInterpolated = false
173	return tag
174
175	}
176
177	func (t *Tag) IsSelfClosing() bool {
178	for _, tag := range selfClosingTags {
179	if tag == t.Name {
180	return true
181	}
182	}
183
184	return false
185	}
186
187	func (t *Tag) IsRawText() bool {
188	return t.Name == "style" \|\| t.Name == "script"
189	}
190
191	type Condition struct {
192	SourcePosition
193	Positive *Block
194	Negative *Block
195	Expression string
196	}
197
198	func newCondition(exp string) *Condition {
199	cond := new(Condition)
200	cond.Expression = exp
201	return cond
202	}
203
204	type Each struct {
205	SourcePosition
206	X string
207	Y string
208	Expression string
209	Block *Block
210	}
211
212	func newEach(exp string) *Each {
213	each := new(Each)
214	each.Expression = exp
215	return each
216	}
217
218	type Assignment struct {
219	SourcePosition
220	X string
221	Expression string
222	}
223
224	func newAssignment(x, expression string) *Assignment {
225	assgn := new(Assignment)
226	assgn.X = x
227	assgn.Expression = expression
228	return assgn
229	}
230
231	type Mixin struct {
232	SourcePosition
233	Block *Block
234	Name string
235	Args []string
236	}
237
238	func newMixin(name, args string) *Mixin {
239	mixin := new(Mixin)
240	mixin.Name = name
241
242	delExp := regexp.MustCompile(`,\s`)
243	mixin.Args = delExp.Split(args, -1)
244
245	for i := 0; i < len(mixin.Args); i++ {
246	mixin.Args[i] = strings.TrimSpace(mixin.Args[i])
247	if mixin.Args[i] == "" {
248	mixin.Args = append(mixin.Args[:i], mixin.Args[i+1:]...)
249	i--
250	}
251	}
252
253	return mixin
254	}
255
256	type MixinCall struct {
257	SourcePosition
258	Name string
259	Args []string
260	}
261
262	func newMixinCall(name, args string) *MixinCall {
263	mixinCall := new(MixinCall)
264	mixinCall.Name = name
265
266	if args != "" {
267	const t = "%s"
268	quoteExp := regexp.MustCompile(`"(.*?)"`)
269	delExp := regexp.MustCompile(`,\s`)
270
271	quotes := quoteExp.FindAllString(args, -1)
272	replaced := quoteExp.ReplaceAllString(args, t)
273	mixinCall.Args = delExp.Split(replaced, -1)
274
275	qi := 0
276	for i, arg := range mixinCall.Args {
277	if arg == t {
278	mixinCall.Args[i] = quotes[qi]
279	qi++
280	}
281	}
282	}
283
284	return mixinCall
285	}
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