mirror of
https://github.com/robertkrimen/otto
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7009038f79
Disable new linters which aren't compatible with this code module. Upgrade github actions to fix caching issues. Run go mod to bring in new styling. Remove space on nolint declarations. Apply all changes to whitespace as required to pass goimports linter. Only trigger checks on pull_request which works for pulls from other forks, where as push only works from the same repo.
115 lines
2.4 KiB
Go
115 lines
2.4 KiB
Go
// Package token defines constants representing the lexical tokens of JavaScript (ECMA5).
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package token
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import (
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"strconv"
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)
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// Token is the set of lexical tokens in JavaScript (ECMA5).
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type Token int
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// String returns the string corresponding to the token.
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// For operators, delimiters, and keywords the string is the actual
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// token string (e.g., for the token PLUS, the String() is
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// "+"). For all other tokens the string corresponds to the token
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// name (e.g. for the token IDENTIFIER, the string is "IDENTIFIER").
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func (tkn Token) String() string {
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if 0 == tkn {
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return "UNKNOWN"
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}
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if tkn < Token(len(token2string)) {
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return token2string[tkn]
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}
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return "token(" + strconv.Itoa(int(tkn)) + ")"
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}
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// This is not used for anything
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func (tkn Token) precedence(in bool) int {
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switch tkn {
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case LOGICAL_OR:
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return 1
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case LOGICAL_AND:
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return 2
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case OR, OR_ASSIGN:
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return 3
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case EXCLUSIVE_OR:
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return 4
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case AND, AND_ASSIGN, AND_NOT, AND_NOT_ASSIGN:
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return 5
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case EQUAL,
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NOT_EQUAL,
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STRICT_EQUAL,
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STRICT_NOT_EQUAL:
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return 6
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case LESS, GREATER, LESS_OR_EQUAL, GREATER_OR_EQUAL, INSTANCEOF:
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return 7
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case IN:
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if in {
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return 7
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}
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return 0
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case SHIFT_LEFT, SHIFT_RIGHT, UNSIGNED_SHIFT_RIGHT:
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fallthrough
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case SHIFT_LEFT_ASSIGN, SHIFT_RIGHT_ASSIGN, UNSIGNED_SHIFT_RIGHT_ASSIGN:
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return 8
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case PLUS, MINUS, ADD_ASSIGN, SUBTRACT_ASSIGN:
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return 9
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case MULTIPLY, SLASH, REMAINDER, MULTIPLY_ASSIGN, QUOTIENT_ASSIGN, REMAINDER_ASSIGN:
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return 11
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}
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return 0
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}
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type _keyword struct {
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token Token
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futureKeyword bool
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strict bool
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}
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// IsKeyword returns the keyword token if literal is a keyword, a KEYWORD token
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// if the literal is a future keyword (const, let, class, super, ...), or 0 if the literal is not a keyword.
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//
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// If the literal is a keyword, IsKeyword returns a second value indicating if the literal
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// is considered a future keyword in strict-mode only.
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//
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// 7.6.1.2 Future Reserved Words:
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//
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// const
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// class
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// enum
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// export
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// extends
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// import
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// super
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//
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// 7.6.1.2 Future Reserved Words (strict):
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//
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// implements
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// interface
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// let
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// package
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// private
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// protected
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// public
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// static
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func IsKeyword(literal string) (Token, bool) {
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if keyword, exists := keywordTable[literal]; exists {
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if keyword.futureKeyword {
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return KEYWORD, keyword.strict
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}
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return keyword.token, false
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}
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return 0, false
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}
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