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|
package main
import (
"fmt"
)
type RegexAST interface {
compileWith(next RegexState) RegexState
}
type RegexASTRune rune
func (ast RegexASTRune) compileWith(next RegexState) RegexState {
return RegexRuneState{
rune: rune(ast),
next: next,
}
}
func (ast RegexASTRune) String() string {
return string(rune(ast))
}
type RegexASTAny struct {}
func (ast RegexASTAny) compileWith(next RegexState) RegexState {
return RegexAnyState{next}
}
func (ast RegexASTAny) String() string {
return "."
}
type RegexASTConcat struct {
first, second RegexAST
}
func (ast RegexASTConcat) compileWith(next RegexState) RegexState {
return ast.first.compileWith(ast.second.compileWith(next))
}
func (ast RegexASTConcat) String() string {
return fmt.Sprintf("Concat{%v, %v}", ast.first, ast.second)
}
type RegexASTOr struct {
first, second RegexAST
}
func (ast RegexASTOr) compileWith(next RegexState) RegexState {
return RegexGroupState{
ast.first.compileWith(next),
ast.second.compileWith(next),
}
}
type RegexASTMaximise struct {
content RegexAST
}
func (ast RegexASTMaximise) compileWith(next RegexState) RegexState {
state := &RegexGroupState{
nil,
next,
}
state.first = ast.content.compileWith(state)
return state
}
type RegexASTMinimise struct {
content RegexAST
}
func (ast RegexASTMinimise) compileWith(next RegexState) RegexState {
state := &RegexGroupState{
next,
nil,
}
state.second = ast.content.compileWith(state)
return state
}
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