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compiler.go
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package main
import (
"fmt"
"io"
"path/filepath"
"strings"
)
var (
texEscaper = strings.NewReplacer(
`\`, `\textbackslash{}`,
`~`, `\textasciitilde{}`,
`^`, `\textasciicircum{}`,
`&`, `\&`,
`%`, `\%`,
`$`, `\$`,
`#`, `\#`,
`_`, `\_`,
`{`, `\{`,
`}`, `\}`,
)
requiredPackages = []Package{
{Name: "tabularx"},
{Name: "color"},
{Name: "enumerate"},
{Name: "hyperref"},
}
)
type Meta map[string]string
type Compiler struct {
w io.Writer
fs *Filesystem
trace StringStack
meta Meta
tmpl *Template
errc chan error
nl int
tabs int
block StringStack
}
func (c *Compiler) dir() string {
return filepath.Dir(c.trace.Peek())
}
func (c *Compiler) compile(src string) error {
abs, err := filepath.Abs(src)
if err != nil {
return err
}
if c.trace.Contains(abs) {
return fmt.Errorf("recursive import of '%s'", abs)
}
buf, err := c.fs.ReadFile(abs)
if err != nil {
return err
}
c.trace.Push(abs)
defer c.trace.Pop()
g := Grammar{
Buffer: string(buf),
Compiler: c,
}
g.Init()
if err := g.Parse(); err != nil {
return err
}
g.Execute()
return nil
}
func (c *Compiler) Compile(src string) error {
c.meta = make(Meta)
c.errc = make(chan error)
go func() {
c.compile(src)
close(c.errc)
}()
return <-c.errc
}
func (c *Compiler) Import(src string) {
err := c.compile(RelativePath(c.dir(), src))
if err != nil {
c.errc <- err
}
}
func (c *Compiler) Begin() {
if c.trace.Size() > 1 {
return
}
tmpl, err := GetTemplate(c.fs, c.dir(), c.meta["template"])
if err != nil {
c.errc <- err
return
}
for _, p := range requiredPackages {
tmpl.AddPackage(p)
}
if err = tmpl.ApplyMeta(c.meta); err != nil {
c.errc <- err
return
}
if err = tmpl.WritePrefix(c.w); err != nil {
c.errc <- err
return
}
c.tmpl = tmpl
}
func (c *Compiler) End() {
if c.trace.Size() > 1 {
return
}
if err := c.tmpl.WriteSuffix(c.w); err != nil {
c.errc <- err
return
}
}
func (c *Compiler) SetMeta(k, v string) {
c.meta[k] = v
}
func (c *Compiler) NewLine() {
if c.nl > 1 {
return
}
c.Write("\n")
c.nl++
}
func (c *Compiler) BeginBlock(n string) {
c.Write(`\begin{` + n + "}\n")
c.block.Push(n)
}
func (c *Compiler) EndBlock() {
c.Write(`\end{` + c.block.Pop() + "}\n")
}
func (c *Compiler) EndAllBlocks() {
for !c.block.Empty() {
c.EndBlock()
}
}
func (c *Compiler) Write(t string) {
c.nl = 0
_, err := fmt.Fprint(c.w, t)
if err != nil {
c.errc <- err
}
}
func (c *Compiler) AddText(t string) {
c.Write(texEscaper.Replace(t))
}
func (c *Compiler) AddLatex(t string) {
c.Write(strings.Trim(t, "\n"))
}
func (c *Compiler) AddSection(t string, l int) {
c.Write(fmt.Sprintf(
`\%ssection{%s}`,
strings.Repeat("sub", l),
t,
))
}
func (c *Compiler) AddEmph(t string) {
c.Write(`\textit{`)
c.AddText(t)
c.Write(`}`)
}
func (c *Compiler) AddBold(t string) {
c.Write(`\textbf{`)
c.AddText(t)
c.Write(`}`)
}
func (c *Compiler) AddLink(url, text string) {
c.Write(`\href{`)
c.AddText(url)
c.Write(`}{`)
c.AddText(text)
c.Write(`}`)
}
func (c *Compiler) AddListItem(list, label string) {
d := c.tabs + 1 - c.block.Size()
if d > 0 {
for ; d > 0; d-- {
c.BeginBlock(list)
}
} else {
for ; d < 0; d++ {
c.EndBlock()
}
}
if c.block.Peek() != list {
c.EndBlock()
c.BeginBlock(list)
}
if label != "" {
c.Write(`\item[`)
c.AddText(label)
c.Write(`] `)
} else {
c.Write(`\item `)
}
}