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errors.go
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/
errors.go
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//
// Copyright (c) 2014-2016 Brian W. Wolter, All rights reserved.
// Ego - an embedded Go parser / compiler
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * Neither the names of Brian W. Wolter nor the names of the contributors may
// be used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
// OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.
//
package ego
import (
"strconv"
)
var excerptCallout excerptFormatter
/**
* A span formatter
*/
type excerptFormatter struct {
}
/**
* Format an excerpt
*/
func (f excerptFormatter) FormatExcerpt(s span) string {
var e string
l := len(s.text)
c := "^"
// find the beginning of the current line and the line number
n := int64(1) // base 1
a := s.offset
for ; a > 0; a-- {
if s.text[a] == '\n' {
a++ // right after the newline
n++ // newline
break
}
}
// count the rest of the newlines
for i := a; i > 0; i-- {
if s.text[i] == '\n' {
n++ // newline
}
}
// find the end of the current line
z := s.offset
for z < l {
if s.text[z] == '\n' {
break
}else{
z++
}
}
// add the excerpt line
x := strconv.FormatInt(n, 10)
e = x +": "+ s.text[a:z] + "\n"
lx := len(x) + len(": ")
// add the callout
p := s.offset - a
for i := 0; i < (p + lx); i++ {
e += " "
}
for i := 0; i < s.length; i++ {
e += c
}
return e + "\n"
}