47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
package core
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import (
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"git.akyoto.dev/cli/q/src/build/ast"
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"git.akyoto.dev/cli/q/src/build/errors"
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"git.akyoto.dev/cli/q/src/build/expression"
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"git.akyoto.dev/cli/q/src/build/token"
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)
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// Compare evaluates a boolean expression.
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func (f *Function) Compare(comparison *expression.Expression) error {
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left := comparison.Children[0]
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right := comparison.Children[1]
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if left.IsLeaf() && left.Token.Kind == token.Identifier {
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name := left.Token.Text(f.File.Bytes)
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variable := f.VariableByName(name)
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if variable == nil {
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return errors.New(&errors.UnknownIdentifier{Name: name}, f.File, left.Token.Position)
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}
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defer f.UseVariable(variable)
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return f.Execute(comparison.Token, variable.Register, right)
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}
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if ast.IsFunctionCall(left) && right.IsLeaf() {
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_, err := f.CompileCall(left)
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if err != nil {
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return err
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}
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return f.ExecuteLeaf(comparison.Token, f.CPU.Output[0], right.Token)
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}
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tmp := f.NewRegister()
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_, err := f.ExpressionToRegister(left, tmp)
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if err != nil {
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return err
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}
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defer f.FreeRegister(tmp)
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return f.Execute(comparison.Token, tmp, right)
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}
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