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48aef0c8a4
```bash for file in `cat diffys`; do printf '%s\n%s\n' "// Copyright 2021 Molecula Corp. All rights reserved." "$(cat $file)" >$file; done ```
50 lines
1 KiB
Go
50 lines
1 KiB
Go
// Copyright 2021 Molecula Corp. All rights reserved.
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package pql
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// Token is a lexical token of the PQL language.
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type Token int
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const (
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// Special tokens
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ILLEGAL Token = iota
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ASSIGN // =
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EQ // ==
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NEQ // !=
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LT // <
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LTE // <=
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GT // >
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GTE // >=
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BETWEEN // >< (this is like a <= x <= b)
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// not used in lexing/parsing, but so that the parser can signal
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// to the executor how to treat the arguments. We used to just add
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// 1 to the arguments if they were LT so the executor could assume
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// it was always <=, <=, but then we needed to support
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// floats/decimals and couldn't do that any more.
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BTWN_LT_LTE // a < x <= b
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BTWN_LTE_LT // a <= x < b
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BTWN_LT_LT // a < x < b
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)
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var tokens = [...]string{
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ILLEGAL: "ILLEGAL",
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ASSIGN: "=",
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EQ: "==",
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NEQ: "!=",
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LT: "<",
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LTE: "<=",
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GT: ">",
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GTE: ">=",
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BETWEEN: "><",
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}
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// String returns the string representation of the token.
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func (tok Token) String() string {
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if tok >= 0 && tok < Token(len(tokens)) {
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return tokens[tok]
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}
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return ""
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}
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