/
Context.go
71 lines (56 loc) · 1.18 KB
/
Context.go
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package main
import (
"path/filepath"
"strings"
)
type Context struct {
src *Source
start FilePos
end FilePos // exclusive
}
func NewBuiltinContext() Context {
return NewSpecialContext("<builtin>")
}
func NewStdinContext() Context {
return NewSpecialContext("<stdin>")
}
func NewSpecialContext(name string) Context {
return Context{
&Source{name, []rune{}},
FilePos{},
FilePos{},
}
}
func (ctx Context) Path() string {
return ctx.src.Path()
}
func (ctx Context) Dir() string {
return filepath.Dir(ctx.Path())
}
func (ctx Context) Error(msg string) error {
return &Error{ctx, false, msg}
}
func (ctx Context) EndError(msg string) error {
return &Error{ctx, true, msg}
}
func (ctx Context) WriteLocation() string {
return ctx.Path() + ":" + ctx.start.ToString()
}
func MergeContexts(a Context, b Context) Context {
start := a.start
end := b.end
return Context{a.src, start, end}
}
func (a Context) Merge(b Context) Context {
return MergeContexts(a, b)
}
func (a Context) Before(b Context) bool {
pathComp := strings.Compare(a.src.path, b.src.path)
if pathComp < 0 {
return true
} else if pathComp > 0 {
return false
} else {
return a.start.Before(b.start)
}
}