diff options
Diffstat (limited to 'lang/spec.go')
| -rw-r--r-- | lang/spec.go | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/lang/spec.go b/lang/spec.go index b1b2580..37017e7 100644 --- a/lang/spec.go +++ b/lang/spec.go @@ -21,22 +21,36 @@ const ( // ASCIILen is the length of the ASCII characters set. const ASCIILen = 1 << 7 // 128 +// Associativity represent the associativity rule of an operator. +type Associativity int + +// Associativity kinds for operators. +const ( + Aboth Associativity = iota // both left and right associative + Aleft // left associative only + Aright // right associative only + Anon // non associative +) + // TokenProp represent token properties for parsing. type TokenProp struct { Token SkipSemi bool // automatic semicolon insertion after newline Precedence int // operator precedence + Associativity } // Spec represents the language specification for scanning. type Spec struct { - CharProp [ASCIILen]uint // special Character properties - End map[string]string // end delimiters, indexed by start - BlockProp map[string]uint // block properties - TokenProps map[string]TokenProp // token properties - DotNum bool // true if a number can start with '.' - IdentASCII bool // true if an identifier can be in ASCII only - NumUnder bool // true if a number can contain _ character + CharProp [ASCIILen]uint // special Character properties + End map[string]string // end delimiters, indexed by start + BlockProp map[string]uint // block properties + Tokens map[string]Token // token per string + TokenProps []TokenProp // token properties, indexed by token + DotNum bool // true if a number can start with '.' + IdentASCII bool // true if an identifier can be in ASCII only + NumUnder bool // true if a number can contain _ character + // TokenProps map[string]TokenProp // token properties } // HasInit stores if a statement may contain a simple init statement. |