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report line number of opening token if a pair (eg bracket) is left open

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gfxmonk 2010-03-12 14:55:35 +11:00 committed by Jeremy Ashkenas
parent b269884f8d
commit e87fa4293d
2 changed files with 16 additions and 4 deletions
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10
lib/rewriter.js
View file

@ -243,8 +243,9 @@
// Ensure that all listed pairs of tokens are correctly balanced throughout
// the course of the token stream.
Rewriter.prototype.ensure_balance = function ensure_balance(pairs) {
var _a, _b, key, levels, unclosed, value;
var _a, _b, key, levels, line, open, open_line, unclosed, value;
levels = {};
open_line = {};
this.scan_tokens((function(__this) {
var __func = function(prev, token, post, i) {
var _a, _b, _c, _d, close, open, pair;
@ -256,6 +257,9 @@
close = _d[1];
levels[open] = levels[open] || 0;
if (token[0] === open) {
if (levels[open] === 0) {
open_line[open] = token[2];
}
levels[open] += 1;
}
if (token[0] === close) {
@ -282,7 +286,9 @@
return _a;
}).call(this);
if (unclosed.length) {
throw new Error("unclosed " + (unclosed[0]));
open = unclosed[0];
line = open_line[open] + 1;
throw new Error("unclosed " + (open) + " on line " + (line));
}
};
// We'd like to support syntax like this:

10
src/rewriter.coffee
View file

@ -174,16 +174,22 @@ exports.Rewriter: class Rewriter
# the course of the token stream.
ensure_balance: (pairs) ->
levels: {}
open_line: {}
@scan_tokens (prev, token, post, i) =>
for pair in pairs
[open, close]: pair
levels[open] ||= 0
levels[open] += 1 if token[0] is open
if token[0] is open
open_line[open]: token[2] if levels[open] == 0
levels[open] += 1
levels[open] -= 1 if token[0] is close
throw new Error("too many ${token[1]} on line ${token[2] + 1}") if levels[open] < 0
return 1
unclosed: key for key, value of levels when value > 0
throw new Error("unclosed ${unclosed[0]}") if unclosed.length
if unclosed.length
open: unclosed[0]
line: open_line[open] + 1
throw new Error("unclosed ${open} on line ${line}")
# We'd like to support syntax like this:
#