pkg/compute/util_format.go

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Content

// Copyright 2023-2024 daviszhen
//
// 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 compute

import (
	"fmt"
	"strings"

	"github.com/daviszhen/plan/pkg/util"
)

type FormatCtx struct {
	buf    strings.Builder
	line   strings.Builder
	offset Padding
	indent Padding
}

func (fc *FormatCtx) AddOffset() {
	fc.offset.AddPad()
}

func (fc *FormatCtx) RestoreOffset() {
	fc.offset.RestorePad()
}

func (fc *FormatCtx) fillOffset() {
	for i := 0; i < fc.offset.pad; i++ {
		fc.buf.WriteByte(' ')
	}
}

func (fc *FormatCtx) writeString(s string) {
	for _, c := range s {
		fc.line.WriteRune(c)
		if c == '\n' {
			fc.buf.WriteString(fc.line.String())
			fc.fillOffset()
			fc.line.Reset()
		}
	}
	fc.buf.WriteString(fc.line.String())
	fc.line.Reset()
}

func (fc *FormatCtx) String() string {
	return fc.buf.String()
}

func (fc *FormatCtx) Write(s string) {
	fc.writeString(s)
}

func (fc *FormatCtx) Writef(f string, args ...any) {
	fc.writeString(fmt.Sprintf(f, args...))
}

func (fc *FormatCtx) Writefln(f string, args ...any) {
	fc.writeString(fmt.Sprintf(f+"\n", args...))
}

func (fc *FormatCtx) Writeln(args ...any) {
	fc.writeString(fmt.Sprintln(args...))
}

func (fc *FormatCtx) WriteStrings(ss []string) {
	for _, s := range ss {
		fc.Writeln(s)
	}
}

func WriteMap[K comparable, V any](ctx *FormatCtx, m map[K]V) {
	for k, v := range m {
		ctx.Writeln(k, ":", v)
	}
}

func WriteExprs(ctx *FormatCtx, exprs []*Expr) {
	for _, e := range exprs {
		ctx.Write(e.String())
	}
}

func WriteExpr(ctx *FormatCtx, expr *Expr) {
	ctx.Write(expr.String())
}

type Format interface {
	Format(*FormatCtx)
}

type Padding struct {
	pad      int
	lastPads []int
}

func (fc *Padding) addPad(d int) {
	if fc.pad+d < 0 {
		fc.pad = 0
	} else {
		fc.pad += d
	}
}

func (fc *Padding) AddPad() {
	fc.lastPads = append(fc.lastPads, fc.pad)
	fc.addPad(defaultIndent)
}

func (fc *Padding) RestorePad() {
	if len(fc.lastPads) <= 0 {
		fc.addPad(-fc.pad)
		return
	}
	fc.pad = fc.lastPads[len(fc.lastPads)-1]
	fc.lastPads = util.Pop(fc.lastPads)
}