103 lines
2.4 KiB
Go
103 lines
2.4 KiB
Go
// Copyright 2016-2020, Pulumi Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package model
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import (
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"fmt"
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"io"
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"github.com/hashicorp/hcl/v2/hclsyntax"
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"github.com/pulumi/pulumi/pkg/v3/codegen/hcl2/syntax"
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)
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type printable interface {
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print(w io.Writer, p *printer)
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// HasLeadingTrivia returns true if the value has associated leading trivia.
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HasLeadingTrivia() bool
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// HasTrailingTrivia returns true if the value has associated trailing trivia.
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HasTrailingTrivia() bool
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// GetLeadingTrivia returns the leading trivia for this value, if any.
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GetLeadingTrivia() syntax.TriviaList
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// GetTrailingTrivia returns the trailing trivia for this value, if any.
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GetTrailingTrivia() syntax.TriviaList
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}
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type printer struct {
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indent string
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}
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type formatter func(f fmt.State, c rune)
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func (fn formatter) Format(f fmt.State, c rune) {
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fn(f, c)
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}
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func (p *printer) indented(f func()) {
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p.indent += " "
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f()
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p.indent = p.indent[:len(p.indent)-4]
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}
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func (p *printer) format(f fmt.State, c rune, pp printable) {
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if f.Flag(' ') && !pp.HasLeadingTrivia() {
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switch pp.(type) {
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case BodyItem:
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p.fprintf(f, "%s", p.indent)
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case Expression:
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p.fprintf(f, " ")
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}
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}
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parentPrecedence, hasPrecedence := f.Precision()
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if !hasPrecedence {
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pp.print(f, p)
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return
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}
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var operator *hclsyntax.Operation
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switch pp := pp.(type) {
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case *BinaryOpExpression:
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operator = pp.Operation
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case *UnaryOpExpression:
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operator = pp.Operation
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}
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precedence := operatorPrecedence(operator)
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switch {
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case precedence < parentPrecedence || (precedence == parentPrecedence && c == 'o'):
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p.fprintf(f, "(")
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pp.print(f, p)
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p.fprintf(f, ")")
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default:
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pp.print(f, p)
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}
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}
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func (p *printer) fprintf(w io.Writer, f string, v ...interface{}) {
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for i, e := range v {
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if printable, ok := e.(printable); ok {
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v[i] = formatter(func(f fmt.State, c rune) {
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p.format(f, c, printable)
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})
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}
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}
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if _, err := fmt.Fprintf(w, f, v...); err != nil {
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panic(err)
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}
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}
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