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waypoint -- it's beginning to parser

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This commit is contained in:
Jeremy Ashkenas 2010-02-07 15:15:36 -05:00
parent 7ec0a8d653
commit 56499984ca
8 changed files with 839 additions and 926 deletions
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18
lib/coffee_script/rewriter.js
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@ -29,7 +29,7 @@
EXPRESSION_CLOSE = ['CATCH', 'WHEN', 'ELSE', 'FINALLY'].concat(EXPRESSION_TAIL);
// Tokens pairs that, in immediate succession, indicate an implicit call.
IMPLICIT_FUNC = ['IDENTIFIER', 'SUPER', ')', 'CALL_END', ']', 'INDEX_END'];
IMPLICIT_END = ['IF', 'UNLESS', 'FOR', 'WHILE', "\n", 'OUTDENT'];
IMPLICIT_END = ['IF', 'UNLESS', 'FOR', 'WHILE', 'TERMINATOR', 'OUTDENT'];
IMPLICIT_CALL = ['IDENTIFIER', 'NUMBER', 'STRING', 'JS', 'REGEX', 'NEW', 'PARAM_START', 'TRY', 'DELETE', 'TYPEOF', 'SWITCH', 'ARGUMENTS', 'TRUE', 'FALSE', 'YES', 'NO', 'ON', 'OFF', '!', '!!', 'NOT', '->', '=>', '[', '(', '{'];
// The inverse mappings of token pairs we're trying to fix up.
INVERSES = {
@ -43,7 +43,7 @@
// Single-line flavors of block expressions that have unclosed endings.
// The grammar can't disambiguate them, so we insert the implicit indentation.
SINGLE_LINERS = ['ELSE', "->", "=>", 'TRY', 'FINALLY', 'THEN'];
SINGLE_CLOSERS = ["\n", 'CATCH', 'FINALLY', 'ELSE', 'OUTDENT', 'LEADING_WHEN', 'PARAM_START'];
SINGLE_CLOSERS = ['TERMINATOR', 'CATCH', 'FINALLY', 'ELSE', 'OUTDENT', 'LEADING_WHEN', 'PARAM_START'];
// Rewrite the token stream in multiple passes, one logical filter at
// a time. This could certainly be changed into a single pass through the
// stream, with a big ol' efficient switch, but it's much nicer like this.
@ -64,14 +64,14 @@
// Allow the return value of the block to tell us how many tokens to move
// forwards (or backwards) in the stream, to make sure we don't miss anything
// as the stream changes length under our feet.
re.prototype.scan_tokens = function scan_tokens(yield) {
re.prototype.scan_tokens = function scan_tokens(block) {
var i, move;
i = 0;
while (true) {
if (!(this.tokens[i])) {
break;
}
move = yield(this.tokens[i - 1], this.tokens[i], this.tokens[i + 1], i);
move = block(this.tokens[i - 1], this.tokens[i], this.tokens[i + 1], i);
i += move;
}
return true;
@ -91,12 +91,12 @@
this.tokens.splice(i + 2, 1);
this.tokens.splice(i - 2, 1);
return 0;
} else if (prev[0] === "\n" && after[0] === 'INDENT') {
} else if (prev[0] === 'TERMINATOR' && after[0] === 'INDENT') {
this.tokens.splice(i + 2, 1);
this.tokens[i - 1] = after;
return 1;
} else if (prev[0] !== "\n" && prev[0] !== 'INDENT' && prev[0] !== 'OUTDENT') {
this.tokens.splice(i, 0, ["\n", "\n"]);
} else if (prev[0] !== 'TERMINATOR' && prev[0] !== 'INDENT' && prev[0] !== 'OUTDENT') {
this.tokens.splice(i, 0, ['TERMINATOR', "\n", prev[2]]);
return 2;
} else {
return 1;
@ -110,7 +110,7 @@
// Leading newlines would introduce an ambiguity in the grammar, so we
// dispatch them here.
re.prototype.remove_leading_newlines = function remove_leading_newlines() {
if (this.tokens[0][0] === "\n") {
if (this.tokens[0][0] === 'TERMINATOR') {
return this.tokens.shift();
}
};
@ -119,7 +119,7 @@
re.prototype.remove_mid_expression_newlines = function remove_mid_expression_newlines() {
return this.scan_tokens((function(__this) {
var __func = function(prev, token, post, i) {
if (!(post && EXPRESSION_CLOSE.indexOf(post[0]) >= 0 && token[0] === "\n")) {
if (!(post && EXPRESSION_CLOSE.indexOf(post[0]) >= 0 && token[0] === 'TERMINATOR')) {
return 1;
}
this.tokens.splice(i, 1);