| // Copyright (C) 2014 The Android Open Source Project |
| // |
| // 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. |
| |
| package parser |
| |
| import ( |
| "android.googlesource.com/platform/tools/gpu/api/ast" |
| "android.googlesource.com/platform/tools/gpu/parse" |
| ) |
| |
| func identifier(p *parse.Parser, cst *parse.Branch) *ast.Identifier { |
| if !p.AlphaNumeric() { |
| return nil |
| } |
| n := &ast.Identifier{} |
| p.ParseLeaf(cst, func(p *parse.Parser, l *parse.Leaf) { |
| n.CST = l |
| l.SetToken(p.Consume()) |
| n.Value = l.Token().String() |
| }) |
| return n |
| } |
| |
| func requireIdentifier(p *parse.Parser, cst *parse.Branch) *ast.Identifier { |
| n := identifier(p, cst) |
| if n == nil { |
| p.Expected("Identifier") |
| } |
| return n |
| } |
| |
| // name '!' ( type | '(' type [ ',' type ] ')' ) |
| func generic(p *parse.Parser, cst *parse.Branch) *ast.Generic { |
| i := identifier(p, cst) |
| if i == nil { |
| return nil |
| } |
| g := &ast.Generic{Name: i} |
| p.ParseBranch(cst, func(p *parse.Parser, cst *parse.Branch) { |
| g.CST = cst |
| if operator(ast.OpGeneric, p, cst) { |
| if operator(ast.OpListStart, p, cst) { |
| for !operator(ast.OpListEnd, p, cst) { |
| if len(g.Arguments) > 0 { |
| requireOperator(ast.OpListSeparator, p, cst) |
| } |
| g.Arguments = append(g.Arguments, requireTypeRef(p, cst)) |
| } |
| } else { |
| g.Arguments = append(g.Arguments, requireTypeRef(p, cst)) |
| } |
| } |
| }) |
| return g |
| } |
| |
| func requireGeneric(p *parse.Parser, cst *parse.Branch) *ast.Generic { |
| n := generic(p, cst) |
| if n == nil { |
| p.Expected("generic identifier") |
| } |
| return n |
| } |
| |
| func peekKeyword(k string, p *parse.Parser) bool { |
| if !p.AlphaNumeric() { |
| return false |
| } |
| if p.Token().String() != string(k) { |
| p.Rollback() |
| return false |
| } |
| p.Rollback() |
| return true |
| } |
| |
| func keyword(k string, p *parse.Parser, cst *parse.Branch) *parse.Leaf { |
| if !p.AlphaNumeric() { |
| return nil |
| } |
| if p.Token().String() != string(k) { |
| p.Rollback() |
| return nil |
| } |
| var result *parse.Leaf |
| p.ParseLeaf(cst, func(p *parse.Parser, l *parse.Leaf) { |
| result = l |
| }) |
| return result |
| } |
| |
| func requireKeyword(k string, p *parse.Parser, cst *parse.Branch) { |
| if keyword(k, p, cst) == nil { |
| p.Expected(string(k)) |
| } |
| } |