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token.go
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token.go
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// Lexer tokens
package lexer
// Token is the type of a single token.
type Token int
const (
ILLEGAL Token = iota
EOF
NEWLINE
CONCAT // Not really a token, but used as an operator
// Symbols
ADD
ADD_ASSIGN
AND
APPEND
ASSIGN
COLON
COMMA
DECR
DIV
DIV_ASSIGN
DOLLAR
EQUALS
GTE
GREATER
INCR
LBRACE
LBRACKET
LESS
LPAREN
LTE
MATCH
MOD
MOD_ASSIGN
MUL
MUL_ASSIGN
NOT_MATCH
NOT
NOT_EQUALS
OR
PIPE
POW
POW_ASSIGN
QUESTION
RBRACE
RBRACKET
RPAREN
SEMICOLON
SUB
SUB_ASSIGN
// Keywords
BEGIN
BREAK
CONTINUE
DELETE
DO
ELSE
END
EXIT
FOR
FUNCTION
GETLINE
IF
IN
NEXT
PRINT
PRINTF
RETURN
WHILE
// Built-in functions
F_ATAN2
F_CLOSE
F_COS
F_EXP
F_GSUB
F_INDEX
F_INT
F_LENGTH
F_LOG
F_MATCH
F_RAND
F_SIN
F_SPLIT
F_SPRINTF
F_SQRT
F_SRAND
F_SUB
F_SUBSTR
F_SYSTEM
F_TOLOWER
F_TOUPPER
// Literals and names (variables and arrays)
NAME
NUMBER
STRING
REGEX
LAST = REGEX
FIRST_FUNC = F_ATAN2
LAST_FUNC = F_TOUPPER
)
var keywordTokens = map[string]Token{
"BEGIN": BEGIN,
"break": BREAK,
"continue": CONTINUE,
"delete": DELETE,
"do": DO,
"else": ELSE,
"END": END,
"exit": EXIT,
"for": FOR,
"function": FUNCTION,
"getline": GETLINE,
"if": IF,
"in": IN,
"next": NEXT,
"print": PRINT,
"printf": PRINTF,
"return": RETURN,
"while": WHILE,
"atan2": F_ATAN2,
"close": F_CLOSE,
"cos": F_COS,
"exp": F_EXP,
"gsub": F_GSUB,
"index": F_INDEX,
"int": F_INT,
"length": F_LENGTH,
"log": F_LOG,
"match": F_MATCH,
"rand": F_RAND,
"sin": F_SIN,
"split": F_SPLIT,
"sprintf": F_SPRINTF,
"sqrt": F_SQRT,
"srand": F_SRAND,
"sub": F_SUB,
"substr": F_SUBSTR,
"system": F_SYSTEM,
"tolower": F_TOLOWER,
"toupper": F_TOUPPER,
}
// KeywordToken returns the token associated with the given keyword
// string, or ILLEGAL if given name is not a keyword.
func KeywordToken(name string) Token {
return keywordTokens[name]
}
var tokenNames = map[Token]string{
ILLEGAL: "<illegal>",
EOF: "EOF",
NEWLINE: "<newline>",
CONCAT: "<concat>",
ADD: "+",
ADD_ASSIGN: "+=",
AND: "&&",
APPEND: ">>",
ASSIGN: "=",
COLON: ":",
COMMA: ",",
DECR: "--",
DIV: "/",
DIV_ASSIGN: "/=",
DOLLAR: "$",
EQUALS: "==",
GTE: ">=",
GREATER: ">",
INCR: "++",
LBRACE: "{",
LBRACKET: "[",
LESS: "<",
LPAREN: "(",
LTE: "<=",
MATCH: "~",
MOD: "%",
MOD_ASSIGN: "%=",
MUL: "*",
MUL_ASSIGN: "*=",
NOT_MATCH: "!~",
NOT: "!",
NOT_EQUALS: "!=",
OR: "||",
PIPE: "|",
POW: "^",
POW_ASSIGN: "^=",
QUESTION: "?",
RBRACE: "}",
RBRACKET: "]",
RPAREN: ")",
SEMICOLON: ";",
SUB: "-",
SUB_ASSIGN: "-=",
BEGIN: "BEGIN",
BREAK: "break",
CONTINUE: "continue",
DELETE: "delete",
DO: "do",
ELSE: "else",
END: "END",
EXIT: "exit",
FOR: "for",
FUNCTION: "function",
GETLINE: "getline",
IF: "if",
IN: "in",
NEXT: "next",
PRINT: "print",
PRINTF: "printf",
RETURN: "return",
WHILE: "while",
F_ATAN2: "atan2",
F_CLOSE: "close",
F_COS: "cos",
F_EXP: "exp",
F_GSUB: "gsub",
F_INDEX: "index",
F_INT: "int",
F_LENGTH: "length",
F_LOG: "log",
F_MATCH: "match",
F_RAND: "rand",
F_SIN: "sin",
F_SPLIT: "split",
F_SPRINTF: "sprintf",
F_SQRT: "sqrt",
F_SRAND: "srand",
F_SUB: "sub",
F_SUBSTR: "substr",
F_SYSTEM: "system",
F_TOLOWER: "tolower",
F_TOUPPER: "toupper",
NAME: "name",
NUMBER: "number",
STRING: "string",
REGEX: "regex",
}
// String returns the string name of this token.
func (t Token) String() string {
return tokenNames[t]
}