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|
package subex
import (
"fmt"
"main/walk"
)
// A node in the AST of a subex
type SubexAST interface {
compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) 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, slotMap *SlotMap, inType Type, outType Type) SubexState {
return ast.First.compileWith(
ast.Second.compileWith(next, slotMap, inType, outType),
slotMap,
inType,
outType,
)
}
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 SubexASTStoreValues struct {
Match SubexAST
Slot rune
}
func (ast SubexASTStoreValues) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
id := slotMap.getId(ast.Slot)
newNext := ast.Match.compileWith(&SubexStoreEndState {
slot: id,
next: next,
}, slotMap, inType, ValueType)
return &SubexCaptureBeginState {
next: newNext,
}
}
func (ast SubexASTStoreValues) 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, slotMap *SlotMap, inType Type, outType Type) SubexState {
return &SubexGroupState {
ast.First.compileWith(next, slotMap, inType, outType),
ast.Second.compileWith(next, slotMap, inType, outType),
}
}
func (ast SubexASTOr) String() string {
return fmt.Sprintf("(%v)|(%v)", ast.First, ast.Second)
}
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, slotMap *SlotMap, inType Type, outType Type) SubexState {
min, _ := cr.minmax()
if min != 0 {
return content.compileWith(
cr.decrement().compile(content, next, slotMap, inType, outType),
slotMap,
inType,
outType,
)
}
if cr.Start == -1 {
state := &SubexGroupState {nil, next}
state.first = content.compileWith(state, slotMap, inType, outType)
return state
}
if cr.End == -1 {
state := &SubexGroupState {next, nil}
state.second = content.compileWith(state, slotMap, inType, outType)
return state
}
if cr.End == 0 {
state := next;
for i := 0; i < cr.Start; i += 1 {
state = &SubexGroupState {
content.compileWith(state, slotMap, inType, outType),
next,
}
}
return state
} else {
state := next;
for i := 0; i < cr.End; i += 1 {
state = &SubexGroupState {
next,
content.compileWith(state, slotMap, inType, outType),
}
}
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, slotMap *SlotMap, inType Type, outType Type) SubexState {
var state SubexState = &SubexDeadState{}
for _, convex := range ast.Acceptable {
state = &SubexGroupState {state, convex.compile(ast.Content, next, slotMap, inType, outType)}
}
return state
}
func (ast SubexASTRepeat) String() string {
return fmt.Sprintf("(%v){...}", ast.Content)
}
// Read in a single specific Atom and output it unchanged
type SubexASTCopyScalar struct {
Scalar walk.Scalar
}
func (ast SubexASTCopyScalar) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if inType != ValueType || outType != ValueType {
panic("Invalid types for SubexASTNot")
}
return &SubexCopyState{
filter: selectScalarFilter {ast.Scalar},
next: next,
}
}
func (ast SubexASTCopyScalar) String() string {
return fmt.Sprintf("a")
}
type SubexASTCopyAnyRune struct {}
func (ast SubexASTCopyAnyRune) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if inType != RuneType || outType != RuneType {
panic("Invalid types for SubexASTNot")
}
return &SubexCopyRuneState {
next: next,
filter: anyRuneFilter{},
}
}
func (ast SubexASTCopyAnyRune) String() string {
return "."
}
type SubexASTCopyRune struct {
rune rune
}
func (ast SubexASTCopyRune) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if inType != RuneType || outType != RuneType {
panic("Invalid types for SubexASTNot")
}
return &SubexCopyRuneState {
next: next,
filter: selectRuneFilter {ast.rune},
}
}
// Read in a single atom that must be a boolean and output it unchanged
type SubexASTCopyBool struct {}
func (ast SubexASTCopyBool) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if inType != ValueType || outType != ValueType {
panic("Invalid types for SubexASTNot")
}
return &SubexCopyState {
next: next,
filter: anyBoolFilter{},
}
}
func (ast SubexASTCopyBool) String() string {
return "?"
}
// Read in a single atom that must be a number and output it unchanged
type SubexASTCopyNumber struct {}
func (ast SubexASTCopyNumber) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if inType != ValueType || outType != ValueType {
panic("Invalid types for SubexASTNot")
}
return &SubexCopyState {
next: next,
filter: anyNumberFilter{},
}
}
func (ast SubexASTCopyNumber) String() string {
return "%"
}
// Read in any single Atom and output it unchanged
type SubexASTCopyAnyValue struct {}
func (ast SubexASTCopyAnyValue) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if inType != ValueType || outType != ValueType {
fmt.Printf("%v, %v", inType, outType)
panic("Invalid types for SubexASTCopyAnyValue")
}
return &SubexCopyState {
next: next,
filter: anyValueFilter{},
}
}
func (ast SubexASTCopyAnyValue) String() string {
return "."
}
/*
type OutputContentAST interface {
compile(slotMap *SlotMap) OutputContent
}
type OutputLoadAST struct {
slot rune
}
func (ast OutputLoadAST) compile(slotMap *SlotMap) OutputContent {
return OutputLoad {slotMap.getId(ast.slot)}
}
type OutputValueLiteralAST struct {
atom walk.Value
}
func (ast OutputValueLiteralAST) compile(slotMap *SlotMap) OutputContent {
return OutputValueLiteral {ast.atom}
}
type OutputRuneLiteralAST struct {
rune walk.StringRuneAtom
}
func (ast OutputRuneLiteralAST) compile(slotMap *SlotMap) OutputContent {
return OutputRuneLiteral {ast.rune}
}
// Output a series of Atoms without reading anything from input
type SubexASTOutput struct {
Replacement []OutputContentAST
}
func (ast SubexASTOutput) compileWith(next SubexState, slotMap *SlotMap, runic bool) SubexState {
var content []OutputContent
for _, el := range ast.Replacement {
content = append(content, el.compile(slotMap))
}
return &SubexOutputState{
content: content,
next: next,
}
}
func (ast SubexASTOutput) String() string {
return "=...="
}
*/
type OutputValueAST interface {
compile(slotMap *SlotMap) OutputValue
}
type OutputValueLoadAST struct {
slot rune
}
func (ast OutputValueLoadAST) compile(slotMap *SlotMap) OutputValue {
return OutputValueLoad {
slotMap.getId(ast.slot),
}
}
type OutputValueLiteralAST struct {
scalar walk.Scalar
}
func (ast OutputValueLiteralAST) compile(slotMap *SlotMap) OutputValue {
return OutputValueLiteral {
ast.scalar,
}
}
type SubexASTOutputValues struct {
Replacement []OutputValueAST
}
func (ast SubexASTOutputValues) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if outType != ValueType {
panic("Invalid outType")
}
var content []OutputValue
for _, el := range ast.Replacement {
content = append(content, el.compile(slotMap))
}
return &SubexOutputValuesState {
content: content,
next: next,
}
}
type OutputRuneAST interface {
compile(slotMap *SlotMap) OutputRune
}
type OutputRuneLoadAST struct {
slot rune
}
func (ast OutputRuneLoadAST) compile(slotMap *SlotMap) OutputRune {
return OutputRuneLoad {slotMap.getRuneId(ast.slot)}
}
type OutputRuneLiteralAST struct {
r rune
}
func (ast OutputRuneLiteralAST) compile (slotMap *SlotMap) OutputRune {
return OutputRuneLiteral {ast.r}
}
type SubexASTOutputRunes struct {
}
// 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, slotMap *SlotMap) SubexState {
// return &SubexRangeState {
// parts: ast.Parts,
// next: next,
// }
// }
// func (ast SubexASTRange) String() string {
// return fmt.Sprintf("[abc=xyz]")
// }
// Run content, if content is a list of booleans, OR them, if all values are castable to numbers, sum them and output the total
// Reject if neither of these cases match
type SubexASTSum struct {
Content SubexAST
}
func (ast SubexASTSum) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if inType != ValueType || outType != ValueType {
panic("Invalid types for SubexASTNot")
}
return &SubexCaptureBeginState {
next: ast.Content.compileWith(&SubexArithmeticEndState {
next: next,
calculate: sumValues,
}, slotMap, inType, outType),
}
}
func (ast SubexASTSum) String() string {
return fmt.Sprintf("(%v)+", ast.Content)
}
// Like sum but for AND and product
type SubexASTProduct struct {
Content SubexAST
}
func (ast SubexASTProduct) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if inType != ValueType || outType != ValueType {
panic("Invalid types for SubexASTNot")
}
return &SubexCaptureBeginState {
next: ast.Content.compileWith(&SubexArithmeticEndState {
next: next,
calculate: multiplyValues,
}, slotMap, inType, outType),
}
}
func (ast SubexASTProduct) String() string {
return fmt.Sprintf("(%v)*", ast.Content)
}
// Runs the content Subex, if all outputted atoms can be cast to numbers, outputs them all negated
// Rejects if this fails
type SubexASTNegate struct {
Content SubexAST
}
func (ast SubexASTNegate) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if inType != ValueType || outType != ValueType {
panic("Invalid types for SubexASTNot")
}
return &SubexCaptureBeginState {
next: ast.Content.compileWith(&SubexArithmeticEndState {
next: next,
calculate: negateValues,
}, slotMap, inType, outType),
}
}
func (ast SubexASTNegate) String() string {
return fmt.Sprintf("(%v)-", ast.Content)
}
// Runs the content Subex and collects the output
// Maps over the values in the output, casting each to a boolean, notting each and then outputs them
// Rejects if it cannot cast to boolean
type SubexASTNot struct {
Content SubexAST
}
func (ast SubexASTNot) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
if inType != ValueType || outType != ValueType {
panic("Invalid types for SubexASTNot")
}
return &SubexCaptureBeginState {
next: ast.Content.compileWith(&SubexArithmeticEndState {
next: next,
calculate: notValues,
}, slotMap, ValueType, ValueType),
}
}
func (ast SubexASTNot) String() string {
return fmt.Sprintf("(%v)!", ast.Content)
}
// Does nothing
type SubexASTEmpty struct {}
func (ast SubexASTEmpty) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
return next
}
func (ast SubexASTEmpty) String() string {
return "()"
}
// Discards the output from the content subex
type SubexASTDiscard struct {
Content SubexAST
InnerOutType Type
}
func (ast SubexASTDiscard) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
newNext := ast.Content.compileWith(&SubexDiscardState {next}, slotMap, inType, ast.InnerOutType)
if inType == ValueType {
return &SubexCaptureBeginState {
next: newNext,
}
} else {
return &SubexCaptureRunesBeginState {
next: newNext,
}
}
}
func (ast SubexASTDiscard) String() string {
return fmt.Sprintf("(%v)$_", ast.Content)
}
type SubexASTDestructure struct {
Destructure Structure
Structure Structure
Content SubexAST
}
func (ast SubexASTDestructure) compileWith(next SubexState, slotMap *SlotMap, inType Type, outType Type) SubexState {
var innerOutType Type
var construct SubexState
switch ast.Structure {
case NoneStructure:
innerOutType = outType
construct = next
case StringStructure:
innerOutType = RuneType
construct = &SubexConstructStringState {
next: next,
}
case ArrayStructure:
innerOutType = ValueType
construct = &SubexConstructArrayState {
next: next,
}
}
var innerInType Type
var destructFooter SubexState
switch ast.Destructure {
case NoneStructure:
innerInType = inType
destructFooter = construct
case StringStructure:
innerInType = RuneType
destructFooter = &SubexDiscardTerminalState {
terminal: walk.StringEnd,
next: &SubexDecrementNestState {
next: construct,
},
}
case ArrayStructure:
innerInType = ValueType
destructFooter = &SubexDiscardTerminalState {
terminal: walk.ArrayEnd,
next: &SubexDecrementNestState {
next: construct,
},
}
}
inner := ast.Content.compileWith(
destructFooter,
slotMap,
innerInType,
innerOutType,
)
var beginConstruct SubexState
switch ast.Structure {
case NoneStructure:
beginConstruct = inner
case StringStructure:
beginConstruct = &SubexCaptureRunesBeginState {
next: inner,
}
case ArrayStructure:
beginConstruct = &SubexCaptureBeginState {
next: inner,
}
}
switch ast.Destructure {
case NoneStructure:
return beginConstruct
case StringStructure:
return &SubexCaptureBeginState {
next: &SubexCopyState {
filter: anyStringFilter{},
next: &SubexDiscardState {
next: &SubexIncrementNestState {
next: beginConstruct,
},
},
},
}
case ArrayStructure:
return &SubexCaptureBeginState {
next: &SubexCopyState {
filter: anyArrayFilter{},
next: &SubexDiscardState {
next: &SubexIncrementNestState {
next: beginConstruct,
},
},
},
}
default:
panic("Invalid destructure in ast")
}
}
|