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https://github.com/kataras/iris.git
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Gerasimos (Makis) Maropoulos
7bedaf55a0
Add String() method to the token Type that returns the human-readable name
of the token (e.g., "LBRACE" for '{'), with fallback to numeric value for
unknown types. Also add typeNames map for token type name lookups.
78 lines
1.5 KiB
Go
78 lines
1.5 KiB
Go
package token
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import "strconv"
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// Type is a specific type of int which describes the symbols.
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type Type int
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// String returns the name of the token type, e.g. "LBRACE" for the '{' symbol.
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// It returns the numeric value of an unknown type as it is.
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func (t Type) String() string {
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if name, ok := typeNames[t]; ok {
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return name
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}
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return strconv.Itoa(int(t))
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}
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// Token describes the letter(s) or symbol, is a result of the lexer.
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type Token struct {
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Type Type
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Literal string
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Start int // including the first char
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End int // including the last char
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}
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// /about/{fullname:alphabetical}
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// /profile/{anySpecialName:string}
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// {id:uint64 range(1,5) else 404}
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// /admin/{id:int eq(1) else 402}
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// /file/{filepath:file else 405}
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const (
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EOF = iota // 0
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ILLEGAL
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// Identifiers + literals
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LBRACE // {
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RBRACE // }
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// PARAM_IDENTIFIER // id
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COLON // :
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LPAREN // (
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RPAREN // )
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// PARAM_FUNC_ARG // 1
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COMMA
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IDENT // string or keyword
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// Keywords
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// keywords_start
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ELSE // else
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// keywords_end
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INT // 42
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)
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var typeNames = map[Type]string{
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EOF: "EOF",
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ILLEGAL: "ILLEGAL",
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LBRACE: "LBRACE",
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RBRACE: "RBRACE",
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COLON: "COLON",
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LPAREN: "LPAREN",
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RPAREN: "RPAREN",
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COMMA: "COMMA",
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IDENT: "IDENT",
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ELSE: "ELSE",
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INT: "INT",
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}
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var keywords = map[string]Type{
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"else": ELSE,
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}
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// LookupIdent receives a series of chars
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// and tries to resolves the token type.
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func LookupIdent(ident string) Type {
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if tok, ok := keywords[ident]; ok {
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return tok
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}
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return IDENT
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}
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