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base64 decoding for embedding image onto the src

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minjaesong
2020-06-03 23:22:34 +09:00
parent e59c507ea0
commit 55b167a66b
9 changed files with 105 additions and 453 deletions
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45
assets/tbas/basic.js
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@@ -77,6 +77,14 @@ function BasicArr() {
this.dimsize = dimsize;
}
}
// Abstract Syntax Tree
// creates empty tree node
function BasicAST() {
this.depth = 0;
this.leaves = [];
this.value = undefined;
this.type = "null"; // literal, operator, variable, function
}
basicInterpreterStatus.gosubStack = [];
basicInterpreterStatus.variables = {};
basicInterpreterStatus.defuns = {};
@@ -108,6 +116,38 @@ basicFunctions._isSeparator = function(code) {
basicFunctions._isOperator = function(code) {
return (code == 0x21 || code == 0x23 || code == 0x25 || code == 0x2A || code == 0x2B || code == 0x2D || code == 0x2E || code == 0x2F || (code >= 0x3C && code <= 0x3E) || code == 0x5E || code == 0x7C);
};
basicFunctions._parseTokens = function(tokens, states) {
// a line has one of these forms:
// VARIABLE = LITERAL
// VARIABLE = FUNCTION ARGUMENTS
// FUNCTION
// FUNCTION ARGUMENTS --arguments may contain another function call
// "FOR" VARIABLE "=" ARGUMENT "TO" ARGUMENT
// "FOR" VARIABLE "=" ARGUMENT "TO" ARGUMENT "STEP" ARGUMENT
// "IF" EXPRESSION "THEN" EXPRESSION
// "IF" EXPRESSION "THEN" EXPRESSION "ELSE" EXPRESSION
// "IF" EXPRESSION "GOTO" ARGUMENT
// "IF" EXPRESSION "GOTO" ARGUMENT "ELSE" EXPRESSION
// "WHILE" EXPRESSION
var i, j, k;
var headWord = tokens[0].toLowerCase();
var treeHead = BasicAST();
// is this a builtin function?
if (typeof basicInterpreterStatus.builtin[headWord] != "undefined") {
treeHead.value = headWord;
treeHead.type = "function";
// find and mark position of separators
var separators = [];
for (i = 1; i < tokens.length; i++) if (states[i] == "sep") separators.push(i);
// parse and populate leaves
// TODO
}
};
// @returns: line number for the next command, normally (lnum + 1); if GOTO or GOSUB was met, returns its line number
basicFunctions._interpretLine = function(lnum, cmd) {
var _debugprintStateTransition = false;
@@ -350,6 +390,11 @@ basicFunctions._interpretLine = function(lnum, cmd) {
// END TOKENISE
// PARSING (SYNTAX ANALYSIS)
var syntaxTree = basicFunctions._parseTokens(tokens, modes);
// END PARSING
println(tokens.join("~"));
println(modes.join(" "));