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authorKaren Arutyunov <karen@codesynthesis.com>2016-09-29 22:02:28 +0300
committerKaren Arutyunov <karen@codesynthesis.com>2016-09-29 22:02:28 +0300
commitf4a338ee1a5eb993fb7f9688588b77b12ad944c2 (patch)
treeda7bea25e838d376eddb1263a839aca50571c4a4 /bpkg/manifest-parser.cxx
parent4dc2c7b9fbbe7bec57524d71fd5330e2d1782c52 (diff)
Move manifest_parser and manifest_serializer to libbutl
Diffstat (limited to 'bpkg/manifest-parser.cxx')
-rw-r--r--bpkg/manifest-parser.cxx379
1 files changed, 0 insertions, 379 deletions
diff --git a/bpkg/manifest-parser.cxx b/bpkg/manifest-parser.cxx
deleted file mode 100644
index 58e920a..0000000
--- a/bpkg/manifest-parser.cxx
+++ /dev/null
@@ -1,379 +0,0 @@
-// file : bpkg/manifest-parser.cxx -*- C++ -*-
-// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
-// license : MIT; see accompanying LICENSE file
-
-#include <bpkg/manifest-parser>
-
-#include <cassert>
-#include <sstream>
-
-using namespace std;
-
-namespace bpkg
-{
- using parsing = manifest_parsing;
- using name_value = manifest_name_value;
-
- name_value manifest_parser::
- next ()
- {
- if (s_ == end)
- return name_value {"", "", line, column, line, column};
-
- xchar c (skip_spaces ());
-
- // Here is the problem: if we are in the 'body' state (that is,
- // we are parsing inside the manifest) and we see the special
- // empty name, then before returning the "start" pair for the
- // next manifest, we have to return the "end" pair. One way
- // would be to cache the "start" pair and return it on the
- // next call of next(). But that would require quite a bit
- // of extra logic. The alternative is to detect the beginning
- // of the empty name before parsing too far. This way, the
- // next call to next() will start parsing where we left of
- // and return the "start" pair naturally.
- //
- if (s_ == body && c == ':')
- {
- s_ = start;
- return name_value {"", "", c.line, c.column, c.line, c.column};
- }
-
- // Regardless of the state, what should come next is a name,
- // potentially the special empty one.
- //
- name_value r;
- parse_name (r);
-
- skip_spaces ();
- c = get ();
-
- if (eos (c))
- {
- // This is ok as long as the name is empty.
- //
- if (!r.name.empty ())
- throw parsing (name_, c.line, c.column, "':' expected after name");
-
- s_ = end;
-
- // The "end" pair.
- //
- r.value_line = r.name_line;
- r.value_column = r.name_column;
- return r;
- }
-
- if (c != ':')
- throw parsing (name_, c.line, c.column, "':' expected after name");
-
- skip_spaces ();
- parse_value (r);
-
- c = peek ();
-
- // The character after the value should be either a newline or eos.
- //
- assert (c == '\n' || eos (c));
-
- if (c == '\n')
- get ();
-
- // Now figure out whether what we've got makes sense, depending
- // on the state we are in.
- //
- if (s_ == start)
- {
- // Start of the (next) manifest. The first pair should be the
- // special empty name/format version.
- //
- if (!r.name.empty ())
- throw parsing (name_, r.name_line, r.name_column,
- "format version pair expected");
-
- // The version value is only mandatory for the first manifest in
- // a sequence.
- //
- if (r.value.empty ())
- {
- if (version_.empty ())
- throw parsing (name_, r.value_line, r.value_column,
- "format version value expected");
- r.value = version_;
- }
- else
- {
- version_ = r.value; // Update with the latest.
-
- if (version_ != "1")
- throw parsing (name_, r.value_line, r.value_column,
- "unsupported format version " + version_);
- }
-
- s_ = body;
- }
- else
- {
- // Parsing the body of the manifest.
- //
-
- // Should have been handled by the special case above.
- //
- assert (!r.name.empty ());
- }
-
- return r;
- }
-
- void manifest_parser::
- parse_name (name_value& r)
- {
- xchar c (peek ());
-
- r.name_line = c.line;
- r.name_column = c.column;
-
- for (; !eos (c); c = peek ())
- {
- if (c == ':' || c == ' ' || c == '\t' || c == '\n')
- break;
-
- r.name += c;
- get ();
- }
- }
-
- void manifest_parser::
- parse_value (name_value& r)
- {
- xchar c (peek ());
-
- r.value_line = c.line;
- r.value_column = c.column;
-
- string& v (r.value);
- string::size_type n (0); // Size of last non-space character (simple mode).
-
- // Detect the multi-line mode introductor.
- //
- bool ml (false);
- if (c == '\\')
- {
- get ();
- xchar p (peek ());
-
- if (p == '\n')
- {
- get (); // Newline is not part of the value so skip it.
- c = peek ();
- ml = true;
- }
- else if (eos (p))
- ml = true;
- else
- unget (c);
- }
-
- // The nl flag signals that the preceding character was a "special
- // newline", that is, a newline that was part of the milti-line mode
- // introductor or an escape sequence.
- //
- for (bool nl (ml); !eos (c); c = peek ())
- {
- // Detect the special "\n\\\n" sequence. In the multi-line mode,
- // this is a "terminator". In the simple mode, this is a way to
- // specify a newline.
- //
- // The key idea here is this: if we "swallowed" any characters
- // (i.e., called get() without a matching unget()), then we
- // have to restart the loop in order to do all the tests for
- // the next character. Also, for this to work, we can only
- // add one character to v, which limits us to maximum three
- // characters look-ahead: one in v, one "ungot", and one
- // peeked.
- //
- // The first block handles the special sequence that starts with
- // a special newline. In multi-line mode, this is an "immediate
- // termination" where we "use" the newline from the introductor.
- // Note also that in the simple mode the special sequence can
- // only start with a special (i.e., escaped) newline.
- //
- if (nl)
- {
- nl = false;
-
- if (c == '\\')
- {
- get ();
- xchar c1 (peek ());
-
- if (c1 == '\n' || eos (c1))
- {
- if (ml)
- break;
- else
- {
- if (c1 == '\n')
- get ();
-
- v += '\n'; // Literal newline.
- n = v.size ();
- continue; // Restart from the next character.
- }
- }
- else
- unget (c); // Fall through.
- }
- }
-
- if (c == '\n')
- {
- if (ml)
- {
- get ();
- xchar c1 (peek ());
-
- if (c1 == '\\')
- {
- get ();
- xchar c2 (peek ());
-
- if (c2 == '\n' || eos (c2))
- break;
- else
- {
- v += '\n';
- unget (c1);
- continue; // Restart from c1 (slash).
- }
- }
- else
- unget (c); // Fall through.
- }
- else
- break; // Simple value terminator.
- }
-
- // Detect the newline escape sequence. The same look-ahead
- // approach as above.
- //
- if (c == '\\')
- {
- get ();
- xchar c1 (peek ());
-
- if (c1 == '\n' || eos (c1))
- {
- if (c1 == '\n')
- {
- get ();
- nl = true; // This is a special newline.
- }
- continue; // Restart from the next character.
- }
- else if (c1 == '\\')
- {
- get ();
- xchar c2 (peek ());
-
- if (c2 == '\n' || eos (c1))
- {
- v += '\\';
- n = v.size ();
- // Restart from c2 (newline/eos).
- }
- else
- {
- v += '\\';
- n = v.size ();
- unget (c1); // Restart from c1 (second slash).
- }
-
- continue;
- }
- else
- unget (c); // Fall through.
- }
-
- get ();
- v += c;
-
- if (!ml && c != ' ' && c != '\t')
- n = v.size ();
- }
-
- // Cut off trailing whitespaces.
- //
- if (!ml)
- v.resize (n);
- }
-
- manifest_parser::xchar manifest_parser::
- skip_spaces ()
- {
- xchar c (peek ());
- bool start (c.column == 1);
-
- for (; !eos (c); c = peek ())
- {
- switch (c)
- {
- case ' ':
- case '\t':
- break;
- case '\n':
- {
- // Skip empty lines.
- //
- if (!start)
- return c;
-
- break;
- }
- case '#':
- {
- // We only recognize '#' as a start of a comment at the beginning
- // of the line (sans leading spaces).
- //
- if (!start)
- return c;
-
- get ();
-
- // Read until newline or eos.
- //
- for (c = peek (); !eos (c) && c != '\n'; c = peek ())
- get ();
-
- continue;
- }
- default:
- return c; // Not a space.
- }
-
- get ();
- }
-
- return c;
- }
-
- // manifest_parsing
- //
-
- static string
- format (const string& n, uint64_t l, uint64_t c, const string& d)
- {
- ostringstream os;
- if (!n.empty ())
- os << n << ':';
- os << l << ':' << c << ": error: " << d;
- return os.str ();
- }
-
- manifest_parsing::
- manifest_parsing (const string& n, uint64_t l, uint64_t c, const string& d)
- : runtime_error (format (n, l, c, d)),
- name (n), line (l), column (c), description (d)
- {
- }
-}