/
function.go
108 lines (101 loc) · 2.97 KB
/
function.go
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// Copyright (C) 2017 Google Inc.
//
// 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 (
"github.com/google/gapid/core/text/parse/cst"
"github.com/google/gapid/gapil/ast"
)
// type name '(' [ param { ',' param } } ')' [ block ]
func (p *parser) function(f *ast.Function, b *cst.Branch, withBlock bool) *ast.Function {
p.mappings.Add(f, b)
var result *ast.Parameter
p.ParseBranch(b, func(b *cst.Branch) {
result = &ast.Parameter{Type: p.requireTypeRef(b)}
p.mappings.Add(result, b)
})
f.Generic = p.requireGeneric(b)
p.requireOperator(ast.OpListStart, b)
for !p.operator(ast.OpListEnd, b) {
if p.IsEOF() {
p.Error("end of file reached while looking for '%s'", ast.OpListEnd)
break
}
if len(f.Parameters) > 0 {
p.operator(ast.OpListSeparator, b)
}
p.ParseBranch(b, func(b *cst.Branch) {
f.Parameters = append(f.Parameters, p.parameter(b))
})
}
f.Parameters = append(f.Parameters, result)
if withBlock {
f.Block = p.requireBlock(b)
}
return f
}
// [ annotations ] [ 'this' ] type [annotations] name
func (p *parser) parameter(b *cst.Branch) *ast.Parameter {
param := &ast.Parameter{}
p.parseAnnotations(¶m.Annotations, b)
p.mappings.Add(param, b)
if p.keyword(ast.KeywordThis, b) != nil {
param.This = true
}
param.Type = p.requireTypeRef(b)
p.parseAnnotations(¶m.Annotations, b)
param.Name = p.requireIdentifier(b)
return param
}
// { annotation } 'extern' function
func (p *parser) extern(b *cst.Branch, a *ast.Annotations) *ast.Function {
if !p.peekKeyword(ast.KeywordExtern) {
return nil
}
e := &ast.Function{}
consumeAnnotations(&e.Annotations, a)
p.ParseBranch(b, func(b *cst.Branch) {
p.mappings.Add(e, b)
p.requireKeyword(ast.KeywordExtern, b)
p.function(e, b, false)
})
return e
}
// { annotation } 'cmd' function
func (p *parser) command(b *cst.Branch, a *ast.Annotations) *ast.Function {
if !p.peekKeyword(ast.KeywordCmd) {
return nil
}
cmd := &ast.Function{}
consumeAnnotations(&cmd.Annotations, a)
p.ParseBranch(b, func(b *cst.Branch) {
p.mappings.Add(cmd, b)
p.requireKeyword(ast.KeywordCmd, b)
p.function(cmd, b, true)
})
return cmd
}
// 'sub' function
func (p *parser) subroutine(b *cst.Branch, a *ast.Annotations) *ast.Function {
if !p.peekKeyword(ast.KeywordSub) {
return nil
}
cmd := &ast.Function{}
consumeAnnotations(&cmd.Annotations, a)
p.ParseBranch(b, func(b *cst.Branch) {
p.mappings.Add(cmd, b)
p.requireKeyword(ast.KeywordSub, b)
p.function(cmd, b, true)
})
return cmd
}