69 lines
1.2 KiB
Go
69 lines
1.2 KiB
Go
package lexer
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import "fmt"
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// Position indicates a line and column pair on a file.
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// Counting starts at 1.
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type Position struct {
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Line int
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Column int
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}
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// String generates a pretty "(Line, Column)"" representation of the Position
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func (p Position) String() string {
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if p.Line == 0 {
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p.Reset()
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}
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return fmt.Sprintf("(%v, %v)", p.Line, p.Column)
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}
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// GoString generates a string representation of the Position for %#v usage
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func (p Position) GoString() string {
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if p.Line == 0 {
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p.Reset()
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}
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return fmt.Sprintf("lexer.Position{%v, %v}", p.Line, p.Column)
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}
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// Reset places a position at (1,1)
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func (p *Position) Reset() {
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p.Line, p.Column = 1, 1
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}
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// Step moves the column one place
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func (p *Position) Step() {
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if p.Line == 0 {
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p.Reset()
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}
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p.Column++
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}
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// Next returns a new Position one rune forward
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// on the line
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func (p Position) Next() Position {
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if p.Line == 0 {
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p.Reset()
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}
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return Position{
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Line: p.Line,
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Column: p.Column + 1,
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}
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}
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// NextLine returns a new Position at the begining of the next
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// line.
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func (p Position) NextLine() Position {
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if p.Line == 0 {
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p.Reset()
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}
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return Position{
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Line: p.Line + 1,
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Column: 1,
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}
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}
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