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Arithmetic Evaluator/Go: Difference between revisions
→Operator precedence parser
m (Both examples work with Go 1. Library example needed a small tweak to match the API.) |
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This is an operator precedence parser. The number format used in calculation can be changed with the line "type Number int".
<
import (
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}
}
</syntaxhighlight>
Example
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</pre>
== External links ==
* [
=Library=
Shown here is use of the package go/parser in the standard library. For the Go 1 release, there is a parser in the standard library, but not an evaluator. Evaluation is relatively easy though, once you have a parse tree.
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"go", // a valid keyword, not valid in an expression.
"3@7", // error message is "illegal character."
"", // EOF seems a reasonable error message.
}
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go: 1:1: expected operand, found 'go'
3@7: 1:2: illegal character U+0040 '@'
: 1:1: expected operand, found 'EOF'
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