mirror of
https://github.com/inexorabletash/jsbasic.git
synced 2024-11-27 12:49:56 +00:00
Parse error cleanup. Don't tokenize digraphs.
This commit is contained in:
Joshua Bell
parent
e44c2069e8
commit
c96d891dc3
80
basic.js
80
basic.js
@ -1173,10 +1173,8 @@ this.basic = (function() {
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currLineNumber = 0;
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function parse_error(msg) {
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var e = new basic.ParseError(msg + " in line " + currLineNumber,
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return new basic.ParseError(msg + " in line " + currLineNumber,
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currLine, currColumn);
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throw e;
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}
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@ -1214,7 +1212,7 @@ this.basic = (function() {
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regexStringLiteral = /^"([^"]*?)(?:"|(?=\n|\r|$))/,
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regexNumberLiteral = /^[0-9]*\.?[0-9]+(?:[eE]\s*[\-+]?\s*[0-9]+)?/,
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regexHexLiteral = /^\$[0-9A-Fa-f]+/,
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regexOperator = /^(;|<[ \t]*=|=[ \t]*<|>[ \t]*=|=[ \t]*>|=[ \t]*=|<[ \t]*>|>[ \t]*<|=|<|>|\+|-|\*|\/|\^|\(|\)|,)/,
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regexOperator = /^[;=<>+\-*\/\^(),]/,
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regexLineNumber = /^[0-9]+/,
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regexSeparator = /^:/,
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@ -1268,7 +1266,7 @@ this.basic = (function() {
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// Extension - allow leading : to continue previous line
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token.separator = stream.lastMatch[0];
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} else {
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parse_error("Syntax error: Expected line number or separator");
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throw parse_error("Syntax error: Expected line number or separator");
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}
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} else if (stream.match(regexRemark)) {
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token.remark = stream.lastMatch[2];
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@ -1291,7 +1289,7 @@ this.basic = (function() {
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} else if (stream.match(regexSeparator)) {
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token.separator = stream.lastMatch[0];
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} else {
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parse_error("Syntax error: Unexpected '" + source.substr(0, 40) + "'");
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throw parse_error("Syntax error: Unexpected '" + source.substr(0, 40) + "'");
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}
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return token;
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}
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@ -1301,7 +1299,7 @@ this.basic = (function() {
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match = function match(type, value) {
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if (!lookahead) {
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parse_error("Syntax error: Expected " + type + ", saw end of file");
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throw parse_error("Syntax error: Expected " + type + ", saw end of file");
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}
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var token = lookahead;
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@ -1311,11 +1309,11 @@ this.basic = (function() {
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lookahead = nextToken();
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if (!{}.hasOwnProperty.call(token, type)) {
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parse_error("Syntax error: Expected " + type + ", saw " + JSON.stringify(token));
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throw parse_error("Syntax error: Expected " + type + ", saw " + JSON.stringify(token));
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}
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if (value !== (void 0) && token[type] !== value) {
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parse_error("Syntax error: Expected '" + value + "', saw " + JSON.stringify(token));
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throw parse_error("Syntax error: Expected '" + value + "', saw " + JSON.stringify(token));
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}
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return token[type];
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@ -1397,7 +1395,7 @@ this.basic = (function() {
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function enforce_type(actual, expected) {
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if (actual !== expected) {
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parse_error('Type mismatch error: Expected ' + expected);
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throw parse_error('Type mismatch error: Expected ' + expected);
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}
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}
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@ -1477,7 +1475,7 @@ this.basic = (function() {
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function parsefunction(name) {
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if (!{}.hasOwnProperty.call(funlib, name)) {
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parse_error("Undefined function: " + name);
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throw parse_error("Undefined function: " + name);
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}
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match("operator", "(");
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@ -1618,31 +1616,29 @@ this.basic = (function() {
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function parseRelationalExpression() {
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var lhs = parseAdditiveExpression(), rhs, op;
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while (
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test('operator', '<') || test('operator', '>') ||
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test('operator', '=') || test('operator', '==') ||
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test('operator', '<=') || test('operator', '=<') ||
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test('operator', '>=') || test('operator', '=>') ||
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test('operator', '<>') || test('operator', '><')) {
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while (test('operator', '<') || test('operator', '>') || test('operator', '=')) {
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op = match('operator');
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switch (op) {
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case '<':
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if (test('operator', '=', true)) { op = '<='; break; }
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if (test('operator', '>', true)) { op = '!=='; break; }
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break;
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case '>':
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if (test('operator', '=', true)) { op = '>='; break; }
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if (test('operator', '<', true)) { op = '!=='; break; }
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break;
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case '=':
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if (test('operator', '<', true)) { op = '<='; break; }
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if (test('operator', '>', true)) { op = '>='; break; }
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if (test('operator', '=', true)) { op = '==='; break; }
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op = '===';
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}
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rhs = parseAdditiveExpression();
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enforce_type(rhs.type, lhs.type);
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switch (op) {
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case "<": lhs = { source: '((' + lhs.source + '<' + rhs.source + ')?1:0)', type: 'number' }; break;
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case ">": lhs = { source: '((' + lhs.source + '>' + rhs.source + ')?1:0)', type: 'number' }; break;
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case "<=":
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case "=<": lhs = { source: '((' + lhs.source + '<=' + rhs.source + ')?1:0)', type: 'number' }; break;
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case ">=":
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case "=>": lhs = { source: '((' + lhs.source + '>=' + rhs.source + ')?1:0)', type: 'number' }; break;
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case "=":
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case "==": lhs = { source: '((' + lhs.source + '===' + rhs.source + ')?1:0)', type: 'number' }; break;
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case "<>":
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case "><": lhs = { source: '((' + lhs.source + '!==' + rhs.source + ')?1:0)', type: 'number' }; break;
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}
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lhs = lhs = { source: '((' + lhs.source + op + rhs.source + ')?1:0)', type: 'number' };
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}
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return lhs;
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}
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@ -1748,7 +1744,7 @@ this.basic = (function() {
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match("operator", "=");
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if (vartype(name) !== vartype(param)) {
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parse_error("DEF FN function type and argument type must match");
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throw parse_error("DEF FN function type and argument type must match");
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}
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expr = vartype(name) === 'string'
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@ -1782,7 +1778,7 @@ this.basic = (function() {
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keyword = match('reserved');
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if (keyword !== kws.GOTO && keyword !== kws.GOSUB) {
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parse_error("Syntax error: Expected " + kws.GOTO + " or " + kws.GOSUB);
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throw parse_error("Syntax error: Expected " + kws.GOTO + " or " + kws.GOSUB);
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}
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args = [];
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@ -1804,7 +1800,7 @@ this.basic = (function() {
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case kws.FOR: // FOR i = m TO n STEP s
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name = match('identifier');
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if (vartype(name) !== 'float') {
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parse_error("Syntax error: Expected floating point variable");
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throw parse_error("Syntax error: Expected floating point variable");
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}
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identifiers.variables[name] = true;
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@ -2049,8 +2045,7 @@ this.basic = (function() {
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//////////////////////////////////////////////////////////////////////
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case kws.LIST: // List program statements
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parse_error("Introspection statement not supported: " + keyword);
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return;
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throw parse_error("Introspection statement not supported: " + keyword);
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//////////////////////////////////////////////////////////////////////
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//
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@ -2063,16 +2058,14 @@ this.basic = (function() {
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case kws.SCALE: // Set rotation angle for hires shape
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case kws.DRAW: // Draw hires shape
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case kws.XDRAW: // XOR draw hires shape
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parse_error("Display statement not supported: " + keyword);
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return;
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throw parse_error("Display statement not supported: " + keyword);
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// Interpreter Routines
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case kws.CONT: // Continue stopped program (immediate mode)
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case kws.DEL: // Deletes program statements
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case kws.NEW: // Wipe program
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case kws.RUN: // Execute program
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parse_error("Interpreter statement not supported: " + keyword);
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return;
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throw parse_error("Interpreter statement not supported: " + keyword);
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// Native Routines
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case kws.HIMEM: // Set upper bound of variable memory
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@ -2080,8 +2073,7 @@ this.basic = (function() {
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case kws.LOMEM: // Set low bound of variable memory
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case kws.WAIT: // Wait for memory value to match a condition
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case kws.AMPERSAND: // Command hook
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parse_error("Native interop statement not supported: " + keyword);
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return;
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throw parse_error("Native interop statement not supported: " + keyword);
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// Tape Routines
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case kws.LOAD: // Load program from cassette port
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@ -2089,8 +2081,7 @@ this.basic = (function() {
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case kws.SAVE: // Save program to cassette port
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case kws.STORE: // Store array to cassette port
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case kws.SHLOAD: // Load shape table from cassette port
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parse_error("Tape statement not supported: " + keyword);
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return;
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throw parse_error("Tape statement not supported: " + keyword);
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//////////////////////////////////////////////////////////////////////
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//
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@ -2100,8 +2091,7 @@ this.basic = (function() {
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// Parts of other statements - AT, FN, STEP, TO, THEN, etc.
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default:
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parse_error("Syntax error: " + keyword);
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return;
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throw parse_error("Syntax error: " + keyword);
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}
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}
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