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template.go
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template.go
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package main
import (
"bytes"
"fmt"
"regexp"
"strconv"
"strings"
textTemplate "text/template"
)
var (
maxFixes = 10
templateErrorRegex = regexp.MustCompile(`template: (.*?):((\d+):)?(\d+): (.*)`)
findTokenRegex = regexp.MustCompile(`['"](.+)['"]`)
findExprRegex = regexp.MustCompile(`<(\..+?)>`)
functionNotFoundRegex = regexp.MustCompile(`function "(.+)" not defined`)
missingValueForCommandRegex = regexp.MustCompile(`missing value for command`)
firstEmptyCommandRegex = regexp.MustCompile(`{{((-?\s*?)|(\s*?-?))}}`)
)
func createTemplateError(err error, level ErrorLevel) templateError {
matches := templateErrorRegex.FindStringSubmatch(err.Error())
if len(matches) == 6 {
// tplName := matches[1]
// 2 is line + : group if char is found
// line is in pos 4, unless a char is found in which case it's 3 and char is 4
lineIndex := 4
char := -1
if matches[3] != "" {
lineIndex = 3
char, err = strconv.Atoi(matches[4])
if err != nil {
char = -1
}
}
line, err := strconv.Atoi(matches[lineIndex])
if err != nil {
line = -1
} else {
line = line - 1
}
description := matches[5]
return templateError{
Line: line,
Char: char,
Description: description,
Level: level,
}
}
return templateError{
Line: -1,
Char: -1,
Description: err.Error(),
Level: misunderstoodError,
}
}
func parse(text string, baseTpl *textTemplate.Template) (*textTemplate.Template, []templateError) {
return parseInternal(text, baseTpl, 0)
}
func parseInternal(text string, baseTpl *textTemplate.Template, depth int) (t *textTemplate.Template, tplErrs []templateError) {
lines := SplitLines(text)
if depth >= maxFixes {
return baseTpl, tplErrs
}
t, err := baseTpl.Parse(text)
if err != nil {
tplErrs = append(tplErrs, createTemplateError(err, parseErrorLevel))
// make this mutable
tplErr := &tplErrs[len(tplErrs)-1]
if tplErr.Level != misunderstoodError {
if tplErr.Char == -1 {
// try to find a character to line up with
tokenLoc := findTokenRegex.FindStringIndex(tplErr.Description)
if tokenLoc != nil {
token := string(tplErr.Description[tokenLoc[0]+1 : tokenLoc[1]-1])
lastChar := strings.LastIndex(lines[tplErr.Line], token)
firstChar := strings.Index(lines[tplErr.Line], token)
// if it's not the only match, we don't know which character is the one the error occured on
if lastChar == firstChar {
tplErr.Char = firstChar
}
}
}
badFunctionMatch := functionNotFoundRegex.FindStringSubmatch(tplErr.Description)
if badFunctionMatch != nil {
token := badFunctionMatch[1]
t, parseTplErrs := parseInternal(text, baseTpl.Funcs(textTemplate.FuncMap{
token: func() error {
return nil
},
}), depth+1)
return t, append(tplErrs, parseTplErrs...)
}
if missingValueForCommandRegex.MatchString(tplErr.Description) {
matches := firstEmptyCommandRegex.FindStringSubmatch(text)
if matches != nil {
line := SplitLines(text)[tplErr.Line]
indexes := firstEmptyCommandRegex.FindStringIndex(line)
if indexes != nil {
tplErr.Char = indexes[0]
}
replacement := fmt.Sprintf(fmt.Sprintf("%%%ds", len(matches[0])), "")
t, parseTplErrs := parseInternal(
strings.Replace(text, matches[0], replacement, 1),
baseTpl,
depth+1,
)
return t, append(tplErrs, parseTplErrs...)
}
}
}
return baseTpl, tplErrs
}
return t, tplErrs
}
func exec(t *textTemplate.Template, data interface{}, buf *bytes.Buffer) []templateError {
return execInternal(t, data, buf, 0)
}
func execInternal(t *textTemplate.Template, data interface{}, buf *bytes.Buffer, depth int) []templateError {
tplErrs := make([]templateError, 0)
err := t.Execute(buf, data)
if err != nil {
if err.Error() == fmt.Sprintf(`template: %s: "%s" is an incomplete or empty template`, t.Name(), t.Name()) {
return tplErrs
}
tplErr := createTemplateError(err, execErrorLevel)
tplErrs = append(tplErrs, tplErr)
matches := findExprRegex.FindStringSubmatch(tplErr.Description)
if len(matches) == 2 {
fmt.Println(matches[1])
}
}
return tplErrs
}