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|
package subex
import (
"fmt"
"main/walk"
)
// A node in the AST of a subex
type SubexAST interface {
compileWith(next SubexState) SubexState
}
// Process the first subex, then the second, splitting the input text in two
type SubexASTConcat struct {
first, second SubexAST
}
func (ast SubexASTConcat) compileWith(next SubexState) SubexState {
return ast.first.compileWith(ast.second.compileWith(next))
}
func (ast SubexASTConcat) String() string {
return fmt.Sprintf("(%v)(%v)", ast.first, ast.second)
}
// Processing a subex and storing the output in a slot instead of outputting it
type SubexASTStore struct {
match SubexAST
slot rune
}
func (ast SubexASTStore) compileWith(next SubexState) SubexState {
return &SubexStoreBeginState {
next: ast.match.compileWith(&SubexStoreEndState {
slot: ast.slot,
next: next,
}),
}
}
func (ast SubexASTStore) String() string {
return fmt.Sprintf("$%c(%v)", ast.slot, ast.match)
}
// Try to run the first subex, if it fails then backtrack and use the second
type SubexASTOr struct {
first, second SubexAST
}
func (ast SubexASTOr) compileWith(next SubexState) SubexState {
return &SubexGroupState {
ast.first.compileWith(next),
ast.second.compileWith(next),
}
}
type ConvexRange struct {
start, end int
}
func (cr ConvexRange) minmax() (int, int) {
if cr.start == -1 {
return cr.end, -1
} else if cr.end == -1 {
return cr.start, -1
} else if cr.start < cr.end {
return cr.start, cr.end
} else {
return cr.end, cr.start
}
}
func (cr ConvexRange) decrement() ConvexRange {
if cr.start == -1 {
return ConvexRange{-1, cr.end - 1}
} else if cr.end == -1 {
return ConvexRange{cr.start - 1, -1}
} else {
return ConvexRange{cr.start - 1, cr.end - 1}
}
}
func (cr ConvexRange) compile(content SubexAST, next SubexState) SubexState {
min, _ := cr.minmax()
if min != 0 {
return content.compileWith(cr.decrement().compile(content, next))
}
if cr.start == -1 {
state := &SubexGroupState {nil, next}
state.first = content.compileWith(state)
return state
}
if cr.end == -1 {
state := &SubexGroupState {next, nil}
state.second = content.compileWith(state)
return state
}
if cr.end == 0 {
state := next;
for i := 0; i < cr.start; i += 1 {
state = &SubexGroupState {
content.compileWith(state),
next,
}
}
return state
} else {
state := next;
for i := 0; i < cr.end; i += 1 {
state = &SubexGroupState {
next,
content.compileWith(state),
}
}
return state
}
}
// Try to run the subex a number of times that is one of the numbers in the acceptable range
// Prioritising the left
type SubexASTRepeat struct {
content SubexAST
acceptable []ConvexRange
}
func (ast SubexASTRepeat) compileWith(next SubexState) SubexState {
var state SubexState = &SubexDeadState{}
for _, convex := range ast.acceptable {
state = SubexGroupState {state, convex.compile(ast.content, next)}
}
return state
}
// Read in a single specific Atom and output it unchanged
type SubexASTCopyAtom struct {
atom walk.Atom
}
func (ast SubexASTCopyAtom) compileWith(next SubexState) SubexState {
return &SubexCopyAtomState{
atom: ast.atom,
next: next,
}
}
// Read in any single Atom and output it unchanged
type SubexASTCopyAny struct {}
func (ast SubexASTCopyAny) compileWith(next SubexState) SubexState {
return &SubexCopyAnyState{next}
}
func (ast SubexASTCopyAny) String() string {
return "."
}
// Output a series of Atoms without reading anything from input
type SubexASTOutput struct {
replacement []OutputContent
}
func (ast SubexASTOutput) compileWith(next SubexState) SubexState {
return &SubexOutputState{
content: ast.replacement,
next: next,
}
}
// Read in a repeated subex separated by a delimiter. Greedy
type SubexASTJoin struct {
content, delimiter SubexAST
}
func (ast SubexASTJoin) compileWith(next SubexState) SubexState {
afterContentState := &SubexGroupState {
nil,
next,
}
manyContentsState := ast.content.compileWith(afterContentState)
afterContentState.first = ast.delimiter.compileWith(manyContentsState)
return &SubexGroupState {
manyContentsState,
next,
}
}
// Run each input Atom through a map to produce an output Atom
// Atoms not in the map cause this to not match
type SubexASTRange struct {
parts map[walk.Atom]walk.Atom
}
func (ast SubexASTRange) compileWith(next SubexState) SubexState {
return &SubexRangeState {
parts: ast.parts,
next: next,
}
}
// Run content and then assume that output is a series of numbers, sum them and output the total
// Will cast strings, booleans and null to numbers
type SubexASTSum struct {
content SubexAST
}
func (ast SubexASTSum) compileWith(next SubexState) SubexState {
return &SubexSumBeginState {
next: ast.content.compileWith(&SubexSumEndState {
next: next,
}),
}
}
|
