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Merge pull request #2139 from xushiwei/q
tpl/matcher
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,233 @@ | ||
| /* | ||
| * Copyright (c) 2025 The GoPlus Authors (goplus.org). All rights reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
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| package matcher | ||
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| import ( | ||
| "github.com/goplus/gop/tpl/token" | ||
| "github.com/goplus/gop/tpl/types" | ||
| ) | ||
|
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| // ----------------------------------------------------------------------------- | ||
| // Matcher | ||
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| // Context represents the context of a matching process. | ||
| type Context struct { | ||
| } | ||
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| // Matcher represents a matcher. | ||
| type Matcher interface { | ||
| Match(src []*types.Token, ctx *Context) (n int, result any, err error) | ||
| } | ||
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| // ----------------------------------------------------------------------------- | ||
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| // Error represents a matching error. | ||
| type Error struct { | ||
| } | ||
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| func (p *Error) Error() string { | ||
| panic("todo") | ||
| } | ||
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| // ----------------------------------------------------------------------------- | ||
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| type gToken struct { | ||
| tok token.Token | ||
| } | ||
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| func (p *gToken) Match(src []*types.Token, ctx *Context) (n int, result any, err error) { | ||
| if len(src) == 0 { | ||
| return 0, nil, &Error{} // TODO(xsw): err | ||
| } | ||
| t := src[0] | ||
| if t.Tok != p.tok { | ||
| return 0, nil, &Error{} // TODO(xsw): err | ||
| } | ||
| return 1, t, nil | ||
| } | ||
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| // Token: ADD, SUB, IDENT, INT, FLOAT, CHAR, STRING, etc. | ||
| func Token(tok token.Token) Matcher { | ||
| return &gToken{tok} | ||
| } | ||
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| // ----------------------------------------------------------------------------- | ||
|
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| type gLiteral struct { | ||
| tok token.Token | ||
| lit string | ||
| } | ||
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| func (p *gLiteral) Match(src []*types.Token, ctx *Context) (n int, result any, err error) { | ||
| if len(src) == 0 { | ||
| return 0, nil, &Error{} // TODO(xsw): err | ||
| } | ||
| t := src[0] | ||
| if t.Tok != p.tok || t.Lit != p.lit { | ||
| return 0, nil, &Error{} // TODO(xsw): err | ||
| } | ||
| return 1, t, nil | ||
| } | ||
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| // Literal: "abc", 'a', 123, 1.23, etc. | ||
| func Literal(tok token.Token, lit string) Matcher { | ||
| return &gLiteral{tok, lit} | ||
| } | ||
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| // ----------------------------------------------------------------------------- | ||
|
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| type gChoice struct { | ||
| options []Matcher | ||
| } | ||
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| func (p *gChoice) Match(src []*types.Token, ctx *Context) (n int, result any, err error) { | ||
| var nMax int | ||
| var errMax error | ||
| var multiErr = true | ||
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| for _, g := range p.options { | ||
| if n, result, err = g.Match(src, ctx); err == nil { | ||
| return | ||
| } | ||
| if n >= nMax { | ||
| if n == nMax { | ||
| multiErr = true | ||
| } else { | ||
| nMax, errMax, multiErr = n, err, false | ||
| } | ||
| } | ||
| } | ||
| if multiErr { | ||
| errMax = &Error{} // TODO(xsw): err | ||
| } | ||
| return nMax, nil, errMax | ||
| } | ||
|
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| // Choice: R1 | R2 | ... | Rn | ||
| func Choice(options ...Matcher) Matcher { | ||
| return &gChoice{options} | ||
| } | ||
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| // ----------------------------------------------------------------------------- | ||
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| type gSequence struct { | ||
| items []Matcher | ||
| } | ||
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| func (p *gSequence) Match(src []*types.Token, ctx *Context) (n int, result any, err error) { | ||
| rets := make([]any, len(p.items)) | ||
| for i, g := range p.items { | ||
| n1, ret1, err1 := g.Match(src[n:], ctx) | ||
| if err1 != nil { | ||
| return n + n1, nil, err1 | ||
| } | ||
| rets[i] = ret1 | ||
| n += n1 | ||
| } | ||
| result = rets | ||
| return | ||
| } | ||
|
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| // Sequence: R1 R2 ... Rn | ||
| func Sequence(items ...Matcher) Matcher { | ||
| return &gSequence{items} | ||
| } | ||
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| // ----------------------------------------------------------------------------- | ||
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| type gRepeat0 struct { | ||
| r Matcher | ||
| } | ||
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| func (p *gRepeat0) Match(src []*types.Token, ctx *Context) (n int, result any, err error) { | ||
| g := p.r | ||
| rets := make([]any, 0, 2) | ||
| for { | ||
| n1, ret1, err1 := g.Match(src, ctx) | ||
| if err1 != nil { | ||
| result = rets | ||
| return | ||
| } | ||
| rets = append(rets, ret1) | ||
| n += n1 | ||
| src = src[n1:] | ||
| } | ||
| } | ||
|
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| // Repeat0: *R | ||
| func Repeat0(r Matcher) Matcher { | ||
| return &gRepeat0{r} | ||
| } | ||
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| // ----------------------------------------------------------------------------- | ||
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| type gRepeat1 struct { | ||
| r Matcher | ||
| } | ||
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| func (p *gRepeat1) Match(src []*types.Token, ctx *Context) (n int, result any, err error) { | ||
| g := p.r | ||
| n, ret0, err := g.Match(src, ctx) | ||
| if err != nil { | ||
| return | ||
| } | ||
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| rets := make([]any, 1, 2) | ||
| rets[0] = ret0 | ||
| for { | ||
| n1, ret1, err1 := g.Match(src[n:], ctx) | ||
| if err1 != nil { | ||
| result = rets | ||
| return | ||
| } | ||
| rets = append(rets, ret1) | ||
| n += n1 | ||
| } | ||
| } | ||
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| // Repeat1: +R | ||
| func Repeat1(r Matcher) Matcher { | ||
| return &gRepeat1{r} | ||
| } | ||
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| // ----------------------------------------------------------------------------- | ||
|
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| type gRepeat01 struct { | ||
| r Matcher | ||
| } | ||
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| func (p *gRepeat01) Match(src []*types.Token, ctx *Context) (n int, result any, err error) { | ||
| n, result, err = p.r.Match(src, ctx) | ||
| if err != nil { | ||
| return 0, nil, nil | ||
| } | ||
| return | ||
| } | ||
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| // Repeat01: ?R | ||
| func Repeat01(r Matcher) Matcher { | ||
| return &gRepeat01{r} | ||
| } | ||
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| // ----------------------------------------------------------------------------- | ||
|
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| // List: R1 % R2 is equivalent to R1 *(R2 R1) | ||
| func List(a, b Matcher) Matcher { | ||
| return Sequence(a, Repeat0(Sequence(b, a))) | ||
| } | ||
|
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| // ----------------------------------------------------------------------------- |
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