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Other than catching an error case that was missed before, this CL introduces no changes to the template language or API. For simplicity, templates use spaces as argument separators. This means that spaces are significant: .x .y is not the same as .x.y. In the existing code, these cases are discriminated by the lexer, but that means for instance that (a b).x cannot be distinguished from (a b) .x, which is lousy. Although that syntax is not supported yet, we want to support it and this CL is a necessary step. This CL emits a "space" token (actually a run of spaces) from the lexer so the parser can discriminate these cases. It therefore fixes a couple of undisclosed bugs ("hi".x is now an error) but doesn't otherwise change the language. Later CLs will amend the grammar to make .X a proper operator. There is one unpleasantness: With space a token, three-token lookahead is now required when parsing variable declarations to discriminate them from plain variable references. Otherwise the change isn't bad. The CL also moves the debugging print code out of the lexer into the test, which is the only place it's needed or useful. Step towards resolving issue 3999. It still remains to move field chaining out of the lexer and into the parser and make field access an operator. R=golang-dev, dsymonds CC=golang-dev https://golang.org/cl/6492054 |
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This is the source code repository for the Go programming language. For documentation about how to install and use Go, visit http://golang.org/ or load doc/install.html in your web browser. After installing Go, you can view a nicely formatted doc/install.html by running godoc --http=:6060 and then visiting http://localhost:6060/doc/install.html. Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file. -- Binary Distribution Notes If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this README). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install.html). You should also add the Go binary directory $GOROOT/bin to your shell's path. For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile: export GOROOT=$HOME/go export PATH=$PATH:$GOROOT/bin See doc/install.html for more details.