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even better working parser

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minjaesong
2020-06-11 11:17:59 +09:00
parent b22797e942
commit 7a1d36e5c1
1 changed files with 30 additions and 26 deletions
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56
assets/tbas/basic.js
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@@ -17,10 +17,17 @@ var cmdbufMemFootPrint = 0;
var prompt = "Ok"; var prompt = "Ok";
var lang = {}; var lang = {};
lang.syntaxfehler = function(line) { lang.badNumberFormat = "Bad number format";
lang.badOperatorFormat = "Bad number format";
lang.badFunctionCallFormat = "Bad function call format";
lang.unmatchedBrackets = "Unmatched brackets";
lang.syntaxfehler = function(line, reason) {
if (line === undefined) if (line === undefined)
return "Syntax error"; return "Syntax error";
return "Syntax error in " + line; else if (reason === undefined)
return "Syntax error in " + line;
else
return "Syntax error in " + line + ": " + reason;
}; };
function getUsedMemSize() { function getUsedMemSize() {
@@ -139,19 +146,18 @@ basicFunctions._isSeparator = function(code) {
}; };
basicFunctions._operatorPrecedence = { basicFunctions._operatorPrecedence = {
// function call in itself has highest precedence // function call in itself has highest precedence
"NOT":13, "^":2,
"^":12, "*":3,"/":3,
"*":11,"/":11, "MOD":4,
"MOD":10, "+":5,"-":5,
"+":9,"-":9, "<<":6,">>":6,
"<<":8,">>":8,
"==":7,"<>":7,"><":7,"<":7,">":7,"<=":7,"=<":7,">=":7,"=>":7, "==":7,"<>":7,"><":7,"<":7,">":7,"<=":7,"=<":7,">=":7,"=>":7,
"BAND":6, "BAND":8,
"BXOR":5, "BXOR":9,
"BOR":4, "BOR":10,
"AND":3, "AND":11,
"OR":2, "OR":12,
"=":1 "=":13
}; };
basicFunctions._isUnaryOp = function(word) { basicFunctions._isUnaryOp = function(word) {
return 13 == basicFunctions._operatorPrecedence[word]; return 13 == basicFunctions._operatorPrecedence[word];
@@ -250,7 +256,7 @@ basicFunctions._tokenise = function(lnum, cmd) {
mode = "number2"; mode = "number2";
} }
else { else {
throw lang.syntaxfehler(lnum); throw lang.syntaxfehler(lnum, lang.badNumberFormat);
} }
} }
else if ("number2" == mode) { else if ("number2" == mode) {
@@ -288,7 +294,7 @@ basicFunctions._tokenise = function(lnum, cmd) {
mode = "operator2"; mode = "operator2";
} }
else if (basicFunctions._isFirstOp(charCode)) { else if (basicFunctions._isFirstOp(charCode)) {
throw lang.syntaxfehler(lnum); throw lang.syntaxfehler(lnum, lang.badOperatorFormat);
} }
if (basicFunctions._isNumber(charCode)) { if (basicFunctions._isNumber(charCode)) {
tokens.push(sb); sb = "" + char; states.push(mode); tokens.push(sb); sb = "" + char; states.push(mode);
@@ -317,7 +323,7 @@ basicFunctions._tokenise = function(lnum, cmd) {
} }
else if ("operator2" == mode) { else if ("operator2" == mode) {
if (basicFunctions._isFirstOp(charCode)) { if (basicFunctions._isFirstOp(charCode)) {
throw lang.syntaxfehler(lnum); throw lang.syntaxfehler(lnum, lang.badOperatorFormat);
} }
if (basicFunctions._isNumber(charCode)) { if (basicFunctions._isNumber(charCode)) {
tokens.push(sb); sb = "" + char; states.push("operator"); tokens.push(sb); sb = "" + char; states.push("operator");
@@ -631,7 +637,7 @@ basicFunctions._parseTokens = function(lnum, tokens, states, recDepth) {
} }
} }
if (parenDepth != 0) throw "Unmatched brackets"; if (parenDepth != 0) throw lang.syntaxfehler(lnum, lang.unmatchedBrackets);
// BINARY_OP/UNARY_OP // BINARY_OP/UNARY_OP
if (topmostOp !== undefined) { if (topmostOp !== undefined) {
@@ -660,13 +666,14 @@ basicFunctions._parseTokens = function(lnum, tokens, states, recDepth) {
else { else {
if (_debugSyntaxAnalysis) println("function call"); if (_debugSyntaxAnalysis) println("function call");
var currentFunction = (states[0] == "paren") ? undefined : tokens[0]; var currentFunction = (states[0] == "paren") ? undefined : tokens[0];
treeHead.value = currentFunction; treeHead.value = ("-" == currentFunction) ? "UNARYMINUS" : ("+" == currentFunction) ? "UNARYPLUS" : currentFunction;
treeHead.type = (currentFunction === undefined) ? "null" : "function"; treeHead.type = (currentFunction === undefined) ? "null" : "function";
if (_debugSyntaxAnalysis) println("function name: "+treeHead.value);
var leaves = []; var leaves = [];
// if there is no paren // if there is no paren or paren does NOT start index 1
if (parenStart == 0 && parenEnd == -1 && tokens.length > 1) { if (parenStart >= 2) {
var subtkn = tokens.slice(1, tokens.length); var subtkn = tokens.slice(1, tokens.length);
var substa = states.slice(1, tokens.length); var substa = states.slice(1, tokens.length);
@@ -695,11 +702,8 @@ basicFunctions._parseTokens = function(lnum, tokens, states, recDepth) {
leaves.push(basicFunctions._parseTokens(lnum, subtkn, substa, recDepth + 1)); leaves.push(basicFunctions._parseTokens(lnum, subtkn, substa, recDepth + 1));
} }
} }
else throw lang.syntaxfehler(lnum, lang.badFunctionCallFormat);
treeHead.leaves = leaves;//.filter(function(__v) { return __v !== undefined; }); treeHead.leaves = leaves;//.filter(function(__v) { return __v !== undefined; });
// after-the-fact fix for some unary ops
if (treeHead.value == "-" && treeHead.leaves.length == 1) treeHead.value = "UNARYMINUS";
else if (treeHead.value == "+" && treeHead.leaves.length == 1) treeHead.value = "UNARYPLUS";
} }
} }