handlebars-ng/packages/@handlebars-ng/specification/src/spec/handlebars.grammar at main · nknapp/handlebars-ng · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
@define noStrictParametricProductions true

// @section:Program

Program ::
    ContentStatement
    MustacheStatement
    MustacheStatement[+Unescaped]

// @section:Content

ContentStatement ::
    ContentCharacter ContentStatement?

ContentCharacter ::
    NonMustacheStart
    `\{{`
    `\{{{`

NonMustacheStart ::
    SourceCharacter but not one of MustacheStart or MustacheStart[+Unescaped]

SourceCharacter ::
	> any Unicode code point

// @section:Mustaches

MustacheStatement[Unescaped] ::
    MustacheStart[?Unescaped] MustacheContents MustacheEnd[?Unescaped]

MustacheStart[Unescaped] ::
    [+Unescaped]`{{{`
    [~Unescaped]`{{`

MustacheEnd[Unescaped] ::
    [+Unescaped]`}}}`
    [~Unescaped]`}}`

MustacheContents ::
    WhitespaceControl? Whitespace? PathExpression MustacheParameters? Whitespace? WhitespaceControl?

WhitespaceControl :: `~`

Whitespace ::
    WhitespaceChar Whitespace?

WhitespaceChar :: one of
    `<SPACE>` `<TAB>` `<LF>` `<CR>`

// @section:PathExpressions

PathExpression ::
    Id PathExpressionTail?

PathExpressionTail ::
    `.` PathExpression
    `/` PathExpression

Id ::
    IdCharacter Id?

IdCharacter ::
    SourceCharacter but not one of NonIdCharacter or Whitespace

NonIdCharacter :: one of
    `!` `"` `#` `%` `&` `'` `(` `)` `*` `+` `,` `.` `/` `;` `<` `=` `>` `@` `[` `\` `]` `^` ``` `{` `|` `}` `~`


// @section:HelperParameters

MustacheParameters ::
    Whitespace MustacheParameter MustacheParameters?

// Note: This production is ambiguous: A Literal like `true` or `123` is also a valid
//       PathExpression. In this case, the parser prefers the Literal over
//       the PathExpression.
MustacheParameter ::
    Literal
    PathExpression
    SubExpression


// @section:LiteralExpressions

Literal ::
    StringLiteral
    NumberLiteral
    BooleanLiteral

StringLiteral ::
    `"` AnythingExceptDoubleQuote `"`
    `'` AnythingExceptSingleQuote `'`

AnythingExceptDoubleQuote ::
     SourceCharacter but not `"`

AnythingExceptSingleQuote ::
     SourceCharacter but not `'`

NumberLiteral ::
    Minus? Digits Fraction?

Minus ::
    `-`

Digits ::
    Digit Digits

Digit :: one of
    `0` `1` `2` `3` `4` `5` `6` `7` `8` `9`

Fraction ::
    `.` Digits

BooleanLiteral :: one of
    `true` `false`


// @section:SubExpressions

SubExpression ::
    `(` Whitespace? PathExpression MustacheParameters? Whitespace? `)`