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package bjc.utils.ioutils.format.directives;
import java.io.*;
import java.util.*;
import bjc.esodata.*;
import bjc.utils.ioutils.format.*;
/**
* Implements the [ directive.
*
* This does varying sorts of conditional dispatches on which string to use for
* formatting, allowing it to be based off of general conditions in varying
* ways.
*
* @author Ben Culkin
*/
public class ConditionalDirective implements Directive {
@Override
public Edict compile(CompileContext compCTX) {
CLModifiers mods = compCTX.decr.modifiers;
CLParameters params = compCTX.decr.parameters;
// :ConfigDirectives
GroupDecree clauses = compCTX.directives.nextGroup(compCTX.decr, "]", ";");
ClauseDecree defClause = null;
boolean isDefault = false;
for (ClauseDecree clause : clauses) {
if (isDefault) defClause = clause;
if (clause.terminator != null && clause.terminator.modifiers.colonMod) {
isDefault = true;
}
}
if (mods.starMod && clauses.size() > 0)defClause = clauses.clause();
CLValue index = null;
if (params.length() >= 1) {
params.mapIndices("choice");
index = params.resolveKey("choice");
}
ConditionalEdict.Mode mode;
if (mods.colonMod) {
mode = ConditionalEdict.Mode.FIRST_SECOND;
} else if (mods.atMod) {
mode = ConditionalEdict.Mode.OUTPUT_TRUE;
} else {
mode = ConditionalEdict.Mode.INDEX_CLAUSE;
}
return new ConditionalEdict(mode, mods.dollarMod, index, clauses,
defClause, compCTX.formatter);
}
}
class ConditionalEdict implements Edict {
public static enum Mode {
FIRST_SECOND, OUTPUT_TRUE, INDEX_CLAUSE
}
private Mode condMode;
private boolean decrementIndex;
private CLValue index;
private List<CLString> clauses;
private CLString defClause;
// Think I might need this for something...
@SuppressWarnings("unused")
private CLFormatter formatter;
public ConditionalEdict(Mode condMode, boolean decrementIndex, CLValue index,
GroupDecree clauses, ClauseDecree defClause, CLFormatter fmt) {
this.condMode = condMode;
this.decrementIndex = decrementIndex;
this.index = index;
this.clauses = new ArrayList<>();
for (ClauseDecree clause : clauses) {
List<Edict> compiled = fmt.compile(clause);
this.clauses.add(new CLString(compiled));
}
this.defClause = new CLString(fmt.compile(defClause));
this.formatter = fmt;
}
@Override
public void format(FormatContext formCTX) throws IOException {
Tape<Object> items = formCTX.items;
try {
switch (condMode) {
case FIRST_SECOND: {
Object item = items.item();
items.right();
boolean conditionResult = false;
if (item == null) {
// throw new IllegalArgumentException("No parameter provided for [
// directive.");
} else if (!(item instanceof Boolean)) {
throw new IllegalFormatConversionException('[', item.getClass());
} else {
conditionResult = (Boolean) item;
}
CLString pickedFormat;
if (conditionResult) {
pickedFormat = clauses.get(1);
} else {
pickedFormat = clauses.get(0);
}
pickedFormat.format(formCTX);
}
break;
case OUTPUT_TRUE: {
boolean conditionResult = false;
Object item = items.item();
if (item == null) {
// throw new IllegalArgumentException("No parameter provided for [
// directive.");
} else if (item instanceof Integer) {
if ((Integer) item != 0) {
conditionResult = true;
}
} else if (item instanceof Boolean) {
conditionResult = (Boolean) item;
} else {
throw new IllegalFormatConversionException('[', item.getClass());
}
if (conditionResult) {
clauses.get(0).format(formCTX);
} else {
items.right();
}
}
break;
case INDEX_CLAUSE: {
int clauseIndex;
if (index != null) {
clauseIndex = index.asInt(items, "conditional choice", "[", 0);
} else {
Object item = items.item();
if (item == null) {
throw new IllegalArgumentException(
"No parameter provided for [ directive.");
} else if (!(item instanceof Number)) {
throw new IllegalFormatConversionException('[', item.getClass());
}
clauseIndex = ((Number) item).intValue();
items.right();
}
if (decrementIndex)
clauseIndex -= 1;
if (clauses.size() == 0 || clauseIndex < 0 || clauseIndex >= clauses.size()) {
if (defClause != null) defClause.format(formCTX.writer, items);
} else {
CLString frmt = clauses.get(clauseIndex);
frmt.format(formCTX.writer, items);
}
}
break;
default:
// IMPROVE Should probably handle this
// -- Ben Culkin, 4/14/2020
break;
}
} catch (DirectiveEscape dex) {
// Conditionals are transparent to iteration-escapes
throw dex;
}
}
}
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