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package typdown
/*
#cgo LDFLAGS: -L${SRCDIR}/zig-out/lib -ltypdown
#include <stdlib.h>
#include "typdown.h"
typedef struct typdown_Document Document;
*/
import "C"
import (
"errors"
"fmt"
"html/template"
"unsafe"
)
var (
codeErrors = map[uint8]error{
1: errors.New("out of memory"),
2: ErrInvalidUtf8,
3: ErrNotSupported,
4: ErrModifierNotClosed,
5: ErrInvalidTitleContent,
6: ErrIllegalPlacement,
7: ErrInvalidLink,
8: ErrInvalidImage,
9: ErrInvalidCodeBlock,
10: ErrInvalidCallout,
11: ErrInvalidMathBlock,
}
ErrInvalidUtf8 = errors.New("invalid UTF-8")
ErrNotSupported = errors.New("feature not supported")
ErrModifierNotClosed = errors.New("modifier not closed")
ErrInvalidTitleContent = errors.New("invalid title content")
ErrIllegalPlacement = errors.New("illegal placement")
ErrInvalidLink = errors.New("invalid link")
ErrInvalidImage = errors.New("invalid image")
ErrInvalidCodeBlock = errors.New("invalid code block")
ErrInvalidCallout = errors.New("invalid callout")
ErrInvalidMathBlock = errors.New("invalid math block")
)
type Error struct {
code uint8
source *string
location ErrorLocation
}
func (e Error) Unwrap() error {
return codeErrors[uint8(e.code)]
}
func (e Error) Error() string {
loc := e.location
return fmt.Sprintf("%s: %s (line %d)", e.Unwrap().Error(), loc.source, loc.line)
}
func (e Error) Is(err error) bool {
return errors.Is(e.Unwrap(), err)
}
type ErrorLocation struct {
source string
line uint
}
type Document struct {
Errors []Error
embed C.Document
}
func Parse(content string) Document {
conv := C.CString(content)
defer C.free(unsafe.Pointer(conv))
rawDoc := C.typdown_parse(conv)
doc := Document{embed: rawDoc}
if rawDoc.errors_len > 0 {
doc.Errors = make([]Error, rawDoc.errors_len)
errs := unsafe.Slice(rawDoc.errors, rawDoc.errors_len)
for i := range rawDoc.errors_len {
raw := errs[i]
doc.Errors[i] = Error{
code: uint8(raw.code),
source: &content,
location: ErrorLocation{source: content[raw.location.beg:raw.location.end], line: uint(raw.location.line)},
}
}
}
return doc
}
func (d *Document) Close() {
C.typdown_free(d.embed)
}
func (d *Document) RenderHTML() (template.HTML, error) {
code := C.uchar(0)
raw := C.typdown_renderHTML(d.embed.root, &code)
defer C.free(unsafe.Pointer(raw))
if code > 0 {
err := codeErrors[uint8(code)]
if code == 1 {
panic(err)
}
return "", err
}
return template.HTML(C.GoString(raw)), nil
}
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